!385 SIOCGIFCONF iotcl，用户态到内核态申请内存大小错误

Merge pull request !385 from 刘建东/cherry-pick-1625021431
fixed 4496e71 from https://gitee.com/life-liu/kernel_liteos_a/pulls/373
2021-07-05 00:49:11 +00:00 · 2021-06-30 11:31:08 +08:00 · 2021-06-17 17:01:38 +08:00 · 2021-06-17 15:53:35 +08:00 · 2021-06-17 15:21:24 +08:00 · 2021-06-17 13:54:56 +08:00
3188 changed files with 9694 additions and 344608 deletions
--- a/.gitee/PULL_REQUEST_TEMPLATE.zh-CN.md
+++ b/.gitee/PULL_REQUEST_TEMPLATE.zh-CN.md
@@ -1,6 +1,6 @@
 ### 相关的Issue
-
-  
+    
+    
 ### 原因（目的、解决的问题等）


--- a/.gitignore
+++ b/.gitignore
@@ -1,25 +1,23 @@
-# General ignored file types
+/out
+/test
+/include
+.config*
+cscope*
+tags
+.vscode
 *.o
+.idea
+*.img
+*.swp
+*.rej
+*.orig
 *.a
 *.so
-*.swp
-
-# IDE settings
-.vscode
-.idea
+.config.cmd
 .settings
 .cproject
 .project
-
-# VIM files
-cscope*
-tags
-
-# Menuconfig temp files
-/include/config
-/include/generated
-.config*
-
-# Build temp files
-/platform/board.ld
-/out
+platform/include/menuconfig.h
+platform/board.ld
+apps/init/init
+apps/shell/shell
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -67,7 +67,6 @@ lite_subsystem("kernel") {
    }
  } else {
    deps = [ ":make" ]
-    deps += [ "//kernel/liteos_a/testsuites/unittest:unittest" ]
  }
 }

--- a/41
+++ b/41
@@ -93,28 +93,12 @@ source "../../kernel/liteos_a/fs/ramfs/Kconfig"
 source "../../kernel/liteos_a/fs/nfs/Kconfig"
 source "../../kernel/liteos_a/fs/proc/Kconfig"
 source "../../kernel/liteos_a/fs/jffs2/Kconfig"
+source "../../kernel/liteos_a/fs/zpfs/Kconfig"
 config ENABLE_READ_BUFFER
    bool "Enable read buffer Option"
    default n
-    depends on FS_VFS
    help
      Answer Y to add enable read buffer Option.
-
-config MAX_VNODE_SIZE
-    int "Vnode max number"
-    range 0 512
-    default 512
-    depends on FS_VFS
-    help
-      vnode number, range from 0 to 512.
-
-config MAX_PATH_CACHE_SIZE
-    int "PathCache max number"
-    range 0 1024
-    default 512
-    depends on FS_VFS
-    help
-      pathCache number, range from 0 to 1024.
 endmenu

 ######################## config options of net ############################
@@ -137,7 +121,6 @@ config PLATFORM_ADAPT
 config ENABLE_OOM_LOOP_TASK
    bool "Enable Oom loop task"
    default n
-    depends on KERNEL_VM
    help
      Answer Y to enable oom loop kthread to check system out of memory.

@@ -165,7 +148,6 @@ config THUMB
    default n
    help
      Answer Y to build thumb version.  This will make LiteOS smaller.
-
 config PLATFORM_DVFS
    bool "Enable Dvfs"
    default n
@@ -174,12 +156,6 @@ config PLATFORM_DVFS
      Answer Y to enable LiteOS support dynamic voltage and frequency scaling feature for
      low power consumption.

-config SAVE_EXCINFO
-    bool "Enable Saving Exception Information"
-    default n
-    help
-      Answer Y to enable LiteOS support saving exception information to storage medium.
-
 config DEBUG_VERSION
    bool "Enable a Debug Version"
    default n
@@ -228,6 +204,14 @@ config NET_LWIP_SACK_TFTP
    help
      Answer Y to enable LiteOS support tftp cmd and tftp tool.
 source "../../kernel/liteos_a/net/telnet/Kconfig"
+config EXC_INTERACTION
+    bool "Enable exc interaction"
+    default n
+    depends on SHELL
+    help
+      Answer Y to enable exception interaction for LiteOS, when the system enter exception, user can also interact with system by shell
+      command like readreg, writereg,task,hwi.
+
 config SCHED_DEBUG
    bool "Enable sched debug Feature"
    default n
@@ -302,7 +286,6 @@ source "../../kernel/liteos_a/bsd/dev/usb/Kconfig"
 source "../../drivers/adapter/khdf/liteos/Kconfig"

 source "drivers/char/mem/Kconfig"
-source "drivers/char/quickstart/Kconfig"
 source "drivers/char/random/Kconfig"
 source "../../drivers/liteos/tzdriver/Kconfig"
 source "drivers/char/video/Kconfig"
@@ -314,12 +297,6 @@ menu "Security"
 source "../../kernel/liteos_a/security/Kconfig"
 endmenu

-menu "Test"
-config ENABLE_KERNEL_TEST
-    bool "Enable Kernel Test"
-    default n
-endmenu
-
 menu "Stack Smashing Protector (SSP) Compiler Feature"

 choice
--- a/25
+++ b/25
@@ -49,6 +49,7 @@ LITEOS_TARGET = liteos
 LITEOS_LIBS_TARGET = libs_target
 LITEOS_MENUCONFIG_H = $(LITEOSTOPDIR)/include/generated/autoconf.h
 LITEOS_PLATFORM_BASE = $(LITEOSTOPDIR)/platform
+LITEOS_PLATFORM_MENUCONFIG_H = $(LITEOS_PLATFORM_BASE)/include/menuconfig.h

 export CONFIG_=LOSCFG_
 MENUCONFIG_PATH = $(LITEOSTOPDIR)/tools/menuconfig
@@ -123,7 +124,7 @@ $(__LIBS): $(OUT) $(CXX_INCLUDE)
 $(OUT): $(LITEOS_MENUCONFIG_H)
 	$(HIDE)mkdir -p $(OUT)/lib
 	$(HIDE)$(CC) -I$(LITEOSTOPDIR)/kernel/base/include -I$(LITEOSTOPDIR)/../../$(LOSCFG_BOARD_CONFIG_PATH) \
-		-I$(LITEOS_PLATFORM_BASE)/include -imacros $< -E $(LITEOS_PLATFORM_BASE)/board.ld.S \
+		-I$(LITEOS_PLATFORM_BASE)/include -E $(LITEOS_PLATFORM_BASE)/board.ld.S \
 		-o $(LITEOS_PLATFORM_BASE)/board.ld -P

 $(BUILD):
@@ -143,10 +144,11 @@ genconfig:$(MENUCONFIG_CONF)
 	$(HIDE)mkdir -p include/config include/generated
 	$< --olddefconfig $(KCONFIG_FILE_PATH)
 	$< --silentoldconfig $(KCONFIG_FILE_PATH)
+	-mv -f $(LITEOS_MENUCONFIG_H) $(LITEOS_PLATFORM_MENUCONFIG_H)
 ##### menuconfig end #######

 $(LITEOS_MENUCONFIG_H):
-ifneq ($(LITEOS_MENUCONFIG_H), $(wildcard $(LITEOS_MENUCONFIG_H)))
+ifneq ($(LITEOS_PLATFORM_MENUCONFIG_H), $(wildcard $(LITEOS_PLATFORM_MENUCONFIG_H)))
 	$(HIDE)$(MAKE) genconfig
 endif
 $(LITEOS_TARGET): $(__LIBS)
@@ -180,14 +182,18 @@ endif

 $(ROOTFSDIR): prepare $(APPS)
 	$(HIDE)$(MAKE) clean -C apps
-	$(HIDE)$(LITEOSTOPDIR)/tools/scripts/make_rootfs/rootfsdir.sh $(OUT)/bin $(OUT)/musl $(ROOTFS_DIR) $(LITEOS_TARGET_DIR)
+	$(HIDE)$(LITEOSTOPDIR)/tools/scripts/make_rootfs/rootfsdir.sh $(OUT)/bin $(OUT)/musl $(ROOTFS_DIR)
 ifneq ($(VERSION),)
-	$(HIDE)$(LITEOSTOPDIR)/tools/scripts/make_rootfs/releaseinfo.sh "$(VERSION)" $(ROOTFS_DIR) $(LITEOS_TARGET_DIR)
+	$(HIDE)$(LITEOSTOPDIR)/tools/scripts/make_rootfs/releaseinfo.sh "$(VERSION)" $(ROOTFS_DIR)
 endif

 $(ROOTFS): $(ROOTFSDIR)
 	$(HIDE)$(LITEOSTOPDIR)/tools/scripts/make_rootfs/rootfsimg.sh $(ROOTFS_DIR) $(FSTYPE)
 	$(HIDE)cd $(ROOTFS_DIR)/.. && zip -r $(ROOTFS_ZIP) $(ROOTFS)
+ifneq ($(OUT), $(LITEOS_TARGET_DIR))
+	rm -rf $(LITEOS_TARGET_DIR)rootfs
+	$(HIDE)mv $(ROOTFS_DIR) $(LITEOS_TARGET_DIR)rootfs
+endif

 clean:
 	$(HIDE)for dir in $(LITEOS_SUBDIRS); \
@@ -195,13 +201,16 @@ clean:
 	done
 	$(HIDE)$(MAKE) -C apps clean
 	$(HIDE)$(RM) $(__OBJS) $(LITEOS_TARGET) $(BUILD) $(LITEOS_MENUCONFIG_H) *.bak *~
-	$(HIDE)$(RM) include/config include/generated
+	$(HIDE)$(RM) $(LITEOS_PLATFORM_MENUCONFIG_H)
+	$(HIDE)$(RM) include
 	$(HIDE)$(MAKE) cleanrootfs
 	$(HIDE)echo "clean $(LITEOS_PLATFORM) finish"

-cleanall: clean
-	$(HIDE)$(RM) $(LITEOSTOPDIR)/out $(LITEOS_PLATFORM_BASE)/board.ld
-	$(HIDE)echo "clean all done"
+cleanall:
+	$(HIDE)$(RM) $(LITEOSTOPDIR)/out
+	$(HIDE)find $(LITEOS_PLATFORM_BASE)/ -name board.ld -exec rm -rf {} \;
+	$(HIDE)cd sample/sample_osdrv;make clean;cd ../..;
+	$(HIDE)echo "clean all"

 cleanrootfs:
 	$(HIDE)$(RM) $(OUT)/rootfs
--- a/README_zh-HK.md
+++ b/README_zh-HK.md
@@ -1,97 +0,0 @@
-# LiteOS-A內核<a name="ZH-CN_TOPIC_0000001096612501"></a>
-
- [簡介](#section11660541593)
- [目錄](#section161941989596)
- [約束](#section119744591305)
- [使用說明](#section741617511812)
-    - [準備](#section1579912573329)
-    - [獲取源碼](#section11443189655)
-    - [編譯構建](#section2081013992812)
-
- [相關倉](#section1371113476307)
-
-## 簡介<a name="section11660541593"></a>
-
-OpenHarmony LiteOS-A內核是基於Huawei LiteOS內核演進發展的新一代內核，Huawei LiteOS是面向IoT領域構建的輕量級物聯網操作系統。在IoT產業高速發展的潮流中，OpenHarmony LiteOS-A內核能夠帶給用戶小體積、低功耗、高性能的體驗以及統一開放的生態系統能力，新增了豐富的內核機制、更加全面的POSIX標準接口以及統一驅動框架**HDF**（OpenHarmony Driver Foundation）等，為設備廠商提供了更統一的接入方式，為OpenHarmony的應用開發者提供了更友好的開發體驗。圖1為OpenHarmony LiteOS-A內核架構圖：
-
-**圖 1** OpenHarmony LiteOS-A內核架構圖<a name="fig27311582210"></a>
-![](figures/OpenHarmony-LiteOS-A內核架構圖.png "OpenHarmony-LiteOS-A內核架構圖")
-
-## 目錄<a name="section161941989596"></a>
-
-```
-/kernel/liteos_a
-├── apps # 用戶態的init和shell應用程序
-├── arch # 體系架構的目錄，如arm等
-│ └── arm # arm架構代碼
-├── bsd # freebsd相關的驅動和適配層模塊代碼引入，例如USB等
-├── compat # 內核接口兼容性目錄
-│ └── posix # posix相關接口
-├── drivers # 內核驅動
-│ └── char # 字符設備
-│ ├── mem # 訪問物理IO設備驅動
-│ ├── quickstart # 系統快速啟動接口目錄
-│ ├── random # 隨機數設備驅動
-│ └── video # framebuffer驅動框架
-├── fs # 文件系統模塊，主要來源於NuttX開源項目
-│ ├── fat # fat文件系統
-│ ├── jffs2 # jffs2文件系統
-│ ├── include # 對外暴露頭文件存放目錄
-│ ├── nfs # nfs文件系統
-│ ├── proc # proc文件系統
-│ ├── ramfs # ramfs文件系統
-│ └── vfs # vfs層
-├── kernel # 進程、內存、IPC等模塊
-│ ├── base # 基礎內核，包括調度、內存等模塊
-│ ├── common # 內核通用組件
-│ ├── extended # 擴展內核，包括動態加載、vdso、liteipc等模塊
-│ ├── include # 對外暴露頭文件存放目錄
-│ └── user # 加載init進程
-├── lib # 內核的lib庫
-├── net # 網絡模塊，主要來源於lwip開源項目
-├── platform # 支持不同的芯片平台代碼，如Hi3516DV300等
-│ ├── hw # 時鐘與中斷相關邏輯代碼
-│ ├── include # 對外暴露頭文件存放目錄
-│ └── uart # 串口相關邏輯代碼
-├── platform # 支持不同的芯片平台代碼，如Hi3516DV300等
-├── security # 安全特性相關的代碼，包括進程權限管理和虛擬id映射管理
-├── syscall # 系統調用
-└── tools # 構建工具及相關配置和代碼
-```
-
-## 約束<a name="section119744591305"></a>
-
- 開發語言：C/C++；
- 適用於Hi3518EV300、Hi3516DV300單板；
- Hi3518EV300默認使用jffs2文件系統，Hi3516DV300默認使用FAT文件系統。
-
-## 使用說明<a name="section741617511812"></a>
-
-OpenHarmony LiteOS-A內核支持Hi3518EV300（[介紹](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/Hi3518%E5%BC%80%E5% 8F%91%E6%9D%BF%E4%BB%8B%E7%BB%8D.md)）、Hi3516DV300（[介紹](https://gitee.com/openharmony/docs/blob/master/zh- cn/device-dev/quick-start/Hi3516%E5%BC%80%E5%8F%91%E6%9D%BF%E4%BB%8B%E7%BB%8D.md)）單板，開發者可基於兩種單板開發運行自己的應用程序。
-
-### 準備<a name="section1579912573329"></a>
-
-開發者需要在Linux上搭建編譯環境：
-
- Hi3518EV300單板：參考[環境搭建](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/%E6%90%AD%E5%BB% BA%E7%8E%AF%E5%A2%83.md)；
- Hi3516DV300單板：參考[環境搭建](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/Hi3516%E6%90%AD%E5%BB %BA%E7%8E%AF%E5%A2%83.md)。
-
-### 獲取源碼<a name="section11443189655"></a>
-
-在Linux服務器上下載並解壓一套源代碼，獲取源碼（[下載鏈結](https://repo.huaweicloud.com/harmonyos/os/1.0.1/code-1.0.1.tar.gz)）。更多源碼獲取方式，參考[源碼獲取](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/get-code/%E6%BA%90%E7%A0 %81%E8%8E%B7%E5%8F%96.md)。
-
-### 編譯構建<a name="section2081013992812"></a>
-
-開發者開發第一個應用程序可參考：
-
- [helloworld for Hi3518EV300](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/%E5%BC%80%E5%8F%91Hi3518%E7% AC%AC%E4%B8%80%E4%B8%AA%E7%A4%BA%E4%BE%8B%E7%A8%8B%E5%BA%8F.md)；
-
- [helloworld for Hi3516DV300](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/%E5%BC%80%E5%8F%91Hi3516%E7% AC%AC%E4%B8%80%E4%B8%AA%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E7%A4%BA%E4%BE% 8B.md)。
-
-## 相關倉<a name="section1371113476307"></a>
-
-[內核子系統](https://gitee.com/openharmony/docs/blob/master/zh-cn/readme/%E5%86%85%E6%A0%B8%E5%AD%90%E7%B3 %BB%E7%BB%9F.md)
-
-[drivers\_liteos](https://gitee.com/openharmony/drivers_liteos/blob/master/README_zh.md)
-
-**kernel\_liteos\_a** 
--- a/TODOList.md
+++ b/TODOList.md
@@ -1,61 +0,0 @@
- liteos_m易用性
-	- [ ] liteos_m开发者手册
-	- [ ] 低功耗框架及实现（含投票机制）
-	- [ ] dump增强（配套解析工具）
-	- [ ] 全内存dump（配套解析工具）
-	- [ ] 实现完整L0 OHOS的qemu仿真
-	- [ ] Shell + AT
-
- liteos_m能力增强
-	- [ ] liteos_m支持elf动态加载
-	- [ ] 基于MPU/PMP的多任务简化隔离
-	- [ ] 基于MPU/PMP的多BIN隔离及灌段隔离
-	- [ ] 扩展支持中断嵌套
-	- [ ] 支持arm9架构
-	- [ ] 支持xtensa架构
-
- 文件系统增强
-	- [ ] 提供一种好用且开源的NandFlash文件系统
-	- [ ] 面向fat32、jffs2持续性能优化，做到极致
-	- [ ] fat32支持fast seek（现有fast seek限制文件扩展，需要改造）
-	- [ ] 支持软链接
-	- [ ] 头文件引用关系整理
-	- [ ] 接口层去nuttx
-	- [ ] 文件系统去大锁
-
- liteos_a支持三方芯片易移植性
-	- [ ] 启动框架重构
-	- [ ] musl库归一化
-	- [ ] 去C库预编译
-	- [ ] 宏配置依赖关系整理
-	- [ ] 典型商用配置场景整理并导入门禁（1V1映射，去缺页，去隔离，单进程等等）
-	- [ ] 编译框架整合到gn
-	- [ ] 实现基于python的kconfig可视化配置
-
- liteos_a易用性
-	- [ ] 实现L1 LiteOS-A及上层鸿蒙组件的qemu仿真
-	- [ ] liteos_a开发者手册
-	- [ ] mksh移植
-	- [ ] toybox命令集
-	- [ ] trace、backtrace、dump解析工具等
-	- procfs适配
-		- [ ] ifconfig、fd、free等
-
- liteos_a能力增强
-	- [ ] 单链表整改（SMP多核性能）
-	- [ ] 快启
-	- [ ] 典型高频函数C库性能优化
-	- [ ] rwlock
-
- liteos_a三方库移植
-	- [ ] libuv、dlna、benchmark、iperf、perf、tcpdump 等等
-	-  C库能力补全
-		- [ ] epoll实现 
-
- 测试验证
-	- [ ] syzkaller、difuze等
-
- 探索性课题
-	- [ ] 基于rust重写liteos_m基础内核
-	- [ ] 用户态驱动（对比业界并增强）
-	- [ ] 用户态文件系统
--- a/apps/Makefile
+++ b/apps/Makefile
@@ -27,10 +27,7 @@
 # OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 # ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-LITEOSTOPDIR = $(shell pwd)/../
-
-include $(LITEOSTOPDIR)/.config
-include ./config.mk
+include ../.config
 include ./module.mk

 HIDE := @
--- a/apps/config.mk
+++ b/apps/config.mk
@@ -37,7 +37,7 @@ LIBSOUT := $(OBJOUT)/libs
 IMGOUT  := $(OUT)

 # common flags config
-BASE_OPTS := -ffunction-sections -fdata-sections -fno-omit-frame-pointer -D_GNU_SOURCE \
+BASE_OPTS := -ffunction-sections -fdata-sections -fno-omit-frame-pointer -fno-common -fno-strict-aliasing -D_GNU_SOURCE \
             $(LITEOS_SSP) $(LITEOS_CORE_COPTS) $(WARNING_AS_ERROR) $(LLVM_EXTRA_OPTS) $(LITEOS_GCOV_OPTS)

 CFLAGS := -std=c99 -fno-exceptions $(BASE_OPTS) $(LITEOS_COPTS_OPTMIZE)
@@ -55,6 +55,6 @@ COMMON_INCLUDE := -I $(LITEOSTHIRDPARTY)/bounds_checking_function/include
 # alias variable config
 HIDE := @
 MAKE := make
-RM := rm -rf
-CP := cp -rf
-MV := mv -f
+RM := -rm -rf
+CP := -cp -rf
+MV := -mv
--- a/apps/init/Makefile
+++ b/apps/init/Makefile
--- a/apps/init/src/init.c
+++ b/apps/init/src/init.c
@@ -49,7 +49,7 @@
 int main(int argc, char * const *argv)
 {
    int ret;
-    const char *shellPath = "/bin/mksh";
+    const char *shellPath = "/bin/shell";

 #ifdef LOSCFG_QUICK_START
    const char *samplePath = "/dev/shm/sample_quickstart";
@@ -74,11 +74,6 @@ int main(int argc, char * const *argv)
    if (ret < 0) {
        printf("Failed to fork for shell\n");
    } else if (ret == 0) {
-        ret = tcsetpgrp(STDIN_FILENO, getpgrp());
-        if (ret != 0) {
-            printf("tcsetpgrp failed, pgrpid %d, errno %d\n", getpgrp(), errno);
-            exit(0);
-        }
        (void)execve(shellPath, NULL, NULL);
        exit(0);
    }
--- a/apps/mksh/Makefile
+++ b/apps/mksh/Makefile
@@ -1,67 +0,0 @@
-# Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
-# Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without modification,
-# are permitted provided that the following conditions are met:
-#
-# 1. Redistributions of source code must retain the above copyright notice, this list of
-#    conditions and the following disclaimer.
-#
-# 2. Redistributions in binary form must reproduce the above copyright notice, this list
-#    of conditions and the following disclaimer in the documentation and/or other materials
-#    provided with the distribution.
-#
-# 3. Neither the name of the copyright holder nor the names of its contributors may be used
-#    to endorse or promote products derived from this software without specific prior written
-#    permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
-# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
-# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
-# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
-# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-MKSH := mksh
-
-MKSH_DIR := $(shell pwd)/
-LITEOSTOPDIR = $(MKSH_DIR)/../../
-include $(MKSH_DIR)/../config.mk
-
-APPS_OUT := $(OUT)/bin
-BUILD_DIR := $(MKSH_DIR)/build
-BUILD_LOG := $(MKSH_DIR)/build.log
-TARGET_OS := OpenHarmony
-
-LOCAL_CFLAGS := -flto -fdata-sections -ffunction-sections -O2 -fstack-protector-strong -D_FORTIFY_SOURCE=2 -mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4
-LOCAL_CFLAGS += --target=arm-liteos --sysroot=$(LITEOSTOPDIR)/../../prebuilts/lite/sysroot/
-LOCAL_CFLAGS += -DMKSH_DISABLE_TTY_WARNING -DMKSH_SMALL=1 -DMKSH_ASSUME_UTF8=1 -DMKSH_SMALL_BUT_FAST=0 -DMKSH_S_NOVI=1 -DHAVE_CAN_FSTACKPROTECTORSTRONG=1
-LOCAL_CFLAGS += -DMKSH_LESS_CMDLINE_EDITING -DMKSH_LESS_BUILDINS -DMKSH_NO_INITCOMS -DADAPT_FOR_LITEOS_A
-
-all:$(MKSH)
-
-$(MKSH):
-ifneq ($(wildcard $(BUILD_DIR)/Rebuild.sh),)
-	$(HIDE)echo "not clean, rebuilding now"
-	$(HIDE)chmod +x $(BUILD_DIR)/Rebuild.sh
-	$(HIDE)cd $(BUILD_DIR) && ./Rebuild.sh > $(BUILD_LOG) 2>&1
-else
-	$(HIDE)mkdir -p $(BUILD_DIR)
-	$(HIDE)$(CP) $(LITEOSTHIRDPARTY)/$(MKSH)/. $(BUILD_DIR)
-	$(HIDE)chmod +x $(BUILD_DIR)/Build.sh
-	$(HIDE)cd $(BUILD_DIR) && CC=$(CC) TARGET_OS=$(TARGET_OS) CFLAGS="$(LOCAL_CFLAGS)" LDFLAGS="$(LDFLAGS)" ./Build.sh -r > $(BUILD_LOG) 2>&1
-endif
-	$(HIDE)$(CP) -rf $(BUILD_DIR)/$(MKSH) .
-	$(HIDE)$(STRIP) $(MKSH)
-	$(HIDE)mkdir -p $(APPS_OUT)
-	$(HIDE)$(CP) $(MKSH) $(APPS_OUT)
-
-clean:
-	$(HIDE)$(RM) $(MKSH) $(BUILD_DIR) $(BUILD_LOG)
-
-.PHONY: all $(MKSH) clean
--- a/apps/module.mk
+++ b/apps/module.mk
@@ -29,7 +29,7 @@

 APP_SUBDIRS :=

-##build modules config##
+##compile modules config##

 ifeq ($(LOSCFG_SHELL), y)
 APP_SUBDIRS += shell
@@ -42,11 +42,3 @@ endif
 ifeq ($(LOSCFG_NET_LWIP_SACK_TFTP), y)
 APP_SUBDIRS += tftp
 endif
-
-#only enable for qemu now
-ifeq ($(LOSCFG_PLATFORM_QEMU_ARM_VIRT_CA7), y)
-APP_SUBDIRS += mksh
-ifeq ($(WHEN_TOYBOX_IS_READY), y)
-APP_SUBDIRS += toybox
-endif
-endif
--- a/apps/shell/Makefile
+++ b/apps/shell/Makefile
--- a/apps/shell/builtin/cd.c
+++ b/apps/shell/builtin/cd.c
@@ -37,6 +37,11 @@
 #include "shcmd.h"
 #include "sherr.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 int Chdir(const char *tgtDir)
 {
@@ -48,9 +53,17 @@ int Chdir(const char *tgtDir)

    ret = chdir(tgtDir);
    if (ret == 0) {
-        ret = OsShellSetWorkingDirtectory(tgtDir, strlen(tgtDir) + 1); /* 1: the length of '\0' */        
+        ret = OsShellSetWorkingDirtectory(tgtDir, strlen(tgtDir) + 1); /* 1: the length of '\0' */
+        if (ret != SH_NOK) {
+            return ret;
+        }
    }

    return ret;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif
+#endif
--- a/apps/shell/include/shcmd.h
+++ b/apps/shell/include/shcmd.h
--- a/apps/shell/include/shell.h
+++ b/apps/shell/include/shell.h
--- a/apps/shell/include/shell_list.h
+++ b/apps/shell/include/shell_list.h
@@ -350,14 +350,35 @@ static inline void SH_ListHeadInsertList(SH_List *oldList, SH_List *newList)
 * <li>None.</li>
 * </ul>
 *
- * @param type    [IN] Structure name.
- * @param member  [IN] Name of the member of which the offset is to be measured.
+ * @param type   [IN] Structure name.
+ * @param field  [IN] Name of the field of which the offset is to be measured.
 *
 * @retval Offset of the field to the structure address.
 * @par Dependency:
 * <ul><li>shell_list.h: the header file that contains the API declaration.</li></ul>
 * @see
 */
+#define OFFSET_OF_FIELD(type, field) ((uintptr_t)&((type *)0)->field)
+
+/**
+ * @ingroup shell_list
+ * @brief Obtain the pointer to a doubly linked list in a structure.
+ *
+ * @par Description:
+ * This API is used to obtain the pointer to a doubly linked list in a structure.
+ * @attention
+ * <ul>
+ * <li>None.</li>
+ * </ul>
+ *
+ * @param type    [IN] Structure name.
+ * @param member  [IN] Member name of the doubly linked list in the structure.
+ *
+ * @retval Pointer to the doubly linked list in the structure.
+ * @par Dependency:
+ * <ul><li>shell_list.h: the header file that contains the API declaration.</li></ul>
+ * @see
+ */
 #define LOS_OFF_SET_OF(type, member) ((uintptr_t)&((type *)0)->member)

 /**
--- a/apps/shell/include/shmsg.h
+++ b/apps/shell/include/shmsg.h
--- a/apps/shell/include/show.h
+++ b/apps/shell/include/show.h
--- a/apps/shell/src/main.c
+++ b/apps/shell/src/main.c
@@ -36,6 +36,11 @@
 #include "securec.h"
 #include "unistd.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 ShellCB *g_shellCB = NULL;

@@ -134,3 +139,8 @@ ERR_OUT1:
    return ret;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif
+#endif
--- a/apps/shell/src/shcmd.c
+++ b/apps/shell/src/shcmd.c
@@ -36,6 +36,11 @@
 #include "dirent.h"
 #include "securec.h"

+#ifdef  __cplusplus
+#if  __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 #define SHELL_INIT_MAGIC_FLAG 0xABABABAB
 #define CTRL_C 0x03 /* 0x03: ctrl+c ASCII */
@@ -80,7 +85,7 @@ static int OsStrSeparateTabStrGet(const char **tabStr, CmdParsed *parsed, unsign
    if ((strlen(shiftStr) == 0) || (tempStr[strlen(tempStr) - 1] != shiftStr[strlen(shiftStr) - 1])) {
        *tabStr = "";
    } else {
-        if (OsCmdParse(shiftStr, parsed)) {
+        if (OsCmdTokenSplit(shiftStr, ' ', parsed)) {
            free(tempStr);
            return (int)SH_ERROR;
        }
@@ -196,7 +201,7 @@ static int OsSurePrintAll(unsigned int count)
    char readChar = 0;
    printf("\nDisplay all %u possibilities?(y/n)", count);
    while (1) {
-        if (read(STDIN_FILENO, &readChar, 1) != 1) {
+        if (read(0, &readChar, 1) != 1) {
            return (int)SH_ERROR;
        }
        if ((readChar == 'n') || (readChar == 'N') || (readChar == CTRL_C)) {
@@ -448,15 +453,20 @@ unsigned int OsCmdKeyShift(const char *cmdKey, char *cmdOut, unsigned int size)
    free(outputBak);
    return SH_OK;
 }
-
 int OsTabCompletion(char *cmdKey, unsigned int *len)
 {
    int count;
+    char *cmdMainStr = cmdKey;

    if ((cmdKey == NULL) || (len == NULL)) {
        return (int)SH_ERROR;
    }

+    /* cut left space */
+    while (*cmdMainStr == 0x20) {
+        cmdMainStr++;
+    }
+
    count = OsTabMatchFile(cmdKey, len);

    return count;
@@ -594,3 +604,8 @@ unsigned int OsCmdExec(CmdParsed *cmdParsed, char *cmdStr)
    return ret;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif
+#endif
--- a/apps/shell/src/shcmdparse.c
+++ b/apps/shell/src/shcmdparse.c
@@ -32,6 +32,11 @@
 #include "shcmd.h"
 #include "sherr.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 /*
 * Filter out double quote or single-quoted strings at both ends
@@ -152,3 +157,8 @@ unsigned int OsCmdParse(char *cmdStr, CmdParsed *cmdParsed)
    return OsCmdTokenSplit(cmdStr, ' ', cmdParsed);
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif
+#endif
--- a/apps/shell/src/shmsg.c
+++ b/apps/shell/src/shmsg.c
@@ -42,6 +42,11 @@
 #include "shell_pri.h"
 #include "shcmd.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */


 char *GetCmdline(ShellCB *shellCB)
@@ -345,11 +350,6 @@ static void DoCmdExec(const char *cmdName, const char *cmdline, unsigned int len
                exit(1);
            }

-            ret = tcsetpgrp(STDIN_FILENO, getpgrp());
-            if (ret != 0) {
-                printf("tcsetpgrp failed, pgrpid %d, errno %d\n", getpgrp(), errno);
-            }
-
            ret = execve((const char *)cmdParsed->paramArray[0], (char * const *)cmdParsed->paramArray, NULL);
            if (ret == -1) {
                perror("execve");
@@ -577,7 +577,7 @@ int ShellTaskInit(ShellCB *shellCB)

 static int ShellKernelReg(unsigned int shellHandle)
 {
-    return ioctl(STDIN_FILENO, CONSOLE_CONTROL_REG_USERTASK, shellHandle);
+    return ioctl(0, CONSOLE_CONTROL_REG_USERTASK, shellHandle);
 }

 void *ShellEntry(void *argv)
@@ -640,3 +640,8 @@ int ShellEntryInit(ShellCB *shellCB)
    return ret;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif
+#endif
--- a/apps/toybox/Makefile
+++ b/apps/toybox/Makefile
@@ -1,59 +0,0 @@
-# Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
-# Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without modification,
-# are permitted provided that the following conditions are met:
-#
-# 1. Redistributions of source code must retain the above copyright notice, this list of
-#    conditions and the following disclaimer.
-#
-# 2. Redistributions in binary form must reproduce the above copyright notice, this list
-#    of conditions and the following disclaimer in the documentation and/or other materials
-#    provided with the distribution.
-#
-# 3. Neither the name of the copyright holder nor the names of its contributors may be used
-#    to endorse or promote products derived from this software without specific prior written
-#    permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
-# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
-# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
-# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
-# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-TOYBOX:= toybox
-
-TOYBOX_DIR := $(shell pwd)
-LITEOSTOPDIR = $(TOYBOX_DIR)/../../
-include $(TOYBOX_DIR)/../config.mk
-
-APPS_OUT := $(OUT)/bin
-BUILD_DIR := $(TOYBOX_DIR)/build
-BUILD_LOG := $(TOYBOX_DIR)/build.log
-OUTNAME := $(TOYBOX)
-
-$(TOYBOX):
-ifneq ($(wildcard $(BUILD_DIR)),)
-	$(HIDE)echo "not clean, rebuilding now";
-else
-	$(HIDE)mkdir $(BUILD_DIR)
-	$(HIDE)$(CP) $(LITEOSTHIRDPARTY)/$(TOYBOX)/. $(BUILD_DIR)
-endif
-	$(HIDE)CFLAGS="-D_FORTIFY_SOURCE=2 -fstack-protector-strong --target=arm-liteos \
-	--sysroot=$(LITEOSTOPDIR)/../../prebuilts/lite/sysroot/" CC="$(CC)" OUTNAME=$(OUTNAME) \
-	make -C $(BUILD_DIR) toybox -j> $(BUILD_LOG) 2>&1
-	$(HIDE)$(CP) $(BUILD_DIR)/$(TOYBOX) .
-	$(HIDE)$(STRIP) $(TOYBOX)
-	$(HIDE)mkdir -p $(APPS_OUT)
-	$(HIDE)$(CP) $(TOYBOX) $(APPS_OUT)
-
-clean:
-	$(HIDE)$(RM) $(TOYBOX) $(BUILD_DIR) $(BUILD_LOG)
-
-.PHONY: all $(TOYBOX) clean
--- a/arch/Kconfig
+++ b/arch/Kconfig
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -75,29 +75,3 @@ config ARCH_CORTEX_A7
 config ARCH_CPU
    string
    default "cortex-a7" if ARCH_CORTEX_A7
-
-#
-# Supported GIC version
-#
-
-choice
-    prompt "GIC version"
-    default ARCH_GIC_V2
-    help
-      Interrupt Controller.
-
-config ARCH_GIC_V2
-    bool "GIC Version 2"
-    help
-      This GIC(General Interrupt Controller) version 2 driver is compatatble with
-      GIC version 1 and version 2.
-
-config ARCH_GIC_V3
-    bool "GIC Version 3"
-    depends on ARCH_ARM_V8A || ARCH_ARM_V8R
-    help
-      General Interrupt Controller version 3.
-
-endchoice
-
-
--- a/arch/arm/arm.mk
+++ b/arch/arm/arm.mk
@@ -42,10 +42,7 @@ LITEOS_ARCH_ARM         :=
 endif

 LITEOS_BASELIB          += -l$(LOSCFG_ARCH_CPU)
-LITEOS_BASELIB          += -lgic
-
 LIB_SUBDIRS             += arch/arm/$(LITEOS_ARCH_ARM)
-LIB_SUBDIRS             += arch/arm/gic

 # CPU compile options
 ifeq ($(LOSCFG_ARCH_ARM_AARCH64), y)
--- a/arch/arm/arm/Makefile
+++ b/arch/arm/arm/Makefile
--- a/arch/arm/arm/include/arch_config.h
+++ b/arch/arm/arm/include/arch_config.h
@@ -32,6 +32,7 @@
 #ifndef _ARCH_CONFIG_H
 #define _ARCH_CONFIG_H

+#include "menuconfig.h"

 #define CPSR_INT_DISABLE         0xC0 /* Disable both FIQ and IRQ */
 #define CPSR_IRQ_DISABLE         0x80 /* IRQ disabled when =1 */
--- a/arch/arm/arm/include/arm.h
+++ b/arch/arm/arm/include/arm.h
@@ -36,6 +36,10 @@
 #define CPSR_MODE_USR  0x10
 #define CPSR_MODE_MASK 0x1f

+#define DSB __asm__ volatile("dsb" ::: "memory")
+#define ISB __asm__ volatile("isb" ::: "memory")
+#define DMB __asm__ volatile("dmb" ::: "memory")
+
 STATIC INLINE UINT32 OsArmReadSctlr(VOID)
 {
    UINT32 val;
--- a/arch/arm/arm/include/arm_user_copy.h
+++ b/arch/arm/arm/include/arm_user_copy.h
--- a/arch/arm/arm/include/arm_user_get.h
+++ b/arch/arm/arm/include/arm_user_get.h
--- a/arch/arm/arm/include/arm_user_put.h
+++ b/arch/arm/arm/include/arm_user_put.h
--- a/arch/arm/arm/include/los_hw_cpu.h
+++ b/arch/arm/arm/include/los_hw_cpu.h
@@ -51,7 +51,6 @@ extern "C" {
 #define DSB     __asm__ volatile("dsb" ::: "memory")
 #define DMB     __asm__ volatile("dmb" ::: "memory")
 #define ISB     __asm__ volatile("isb" ::: "memory")
-#define WFI     __asm__ volatile("wfi" ::: "memory")
 #define BARRIER __asm__ volatile("":::"memory")

 #define ARM_SYSREG_READ(REG)                    \
@@ -189,24 +188,6 @@ STATIC INLINE UINT32 ArchIntUnlock(VOID)
    return intSave;
 }

-STATIC INLINE VOID ArchIrqDisable(VOID)
-{
-    __asm__ __volatile__(
-        "cpsid  i      "
-        :
-        :
-        : "memory", "cc");
-}
-
-STATIC INLINE VOID ArchIrqEnable(VOID)
-{
-    __asm__ __volatile__(
-        "cpsie  i      "
-        :
-        :
-        : "memory", "cc");
-}
-
 #else

 STATIC INLINE UINT32 ArchIntLock(VOID)
--- a/arch/arm/arm/include/los_mmu_descriptor_v6.h
+++ b/arch/arm/arm/include/los_mmu_descriptor_v6.h
--- a/arch/arm/arm/include/los_tlb_v6.h
+++ b/arch/arm/arm/include/los_tlb_v6.h
@@ -37,6 +37,7 @@
 #define __LOS_TLB_V6_H__

 #include "los_typedef.h"
+#include "menuconfig.h"
 #include "arm.h"

 #ifdef __cplusplus
--- a/arch/arm/arm/src/hw_user_get.S
+++ b/arch/arm/arm/src/hw_user_get.S
--- a/arch/arm/arm/src/hw_user_put.S
+++ b/arch/arm/arm/src/hw_user_put.S
--- a/arch/arm/arm/src/include/asm.h
+++ b/arch/arm/arm/src/include/asm.h
--- a/arch/arm/arm/src/include/los_exc_pri.h
+++ b/arch/arm/arm/src/include/los_exc_pri.h
@@ -40,6 +40,11 @@ extern "C" {
 #endif /* __cplusplus */
 #endif /* __cplusplus */

+STATIC INLINE VOID OsSetCurrCpuSp(UINTPTR regSp)
+{
+    __asm__ __volatile__("mov sp, %0" :: "r"(regSp));
+}
+
 #define OS_SYSTEM_NORMAL        0
 #define OS_SYSTEM_EXC_CURR_CPU  1
 #define OS_SYSTEM_EXC_OTHER_CPU 2
--- a/arch/arm/arm/src/include/los_hw_pri.h
+++ b/arch/arm/arm/src/include/los_hw_pri.h
@@ -34,7 +34,8 @@

 #include "los_base.h"
 #include "los_hw.h"
-
+#include "los_process_pri.h"
+#include "los_signal.h"
 #ifdef __cplusplus
 #if __cplusplus
 extern "C" {
@@ -55,44 +56,23 @@ typedef struct {
    UINT32 regFPSCR;       /* FPSCR */
    UINT32 regFPEXC;       /* FPEXC */
 #endif
-    UINT32 R4;
-    UINT32 R5;
-    UINT32 R6;
-    UINT32 R7;
-    UINT32 R8;
-    UINT32 R9;
-    UINT32 R10;
-    UINT32 R11;
-
-    /* It has the same structure as IrqContext */
-    UINT32 reserved2; /**< Multiplexing registers, used in interrupts and system calls but with different meanings */
-    UINT32 reserved1; /**< Multiplexing registers, used in interrupts and system calls but with different meanings */
-    UINT32 USP;       /**< User mode sp register */
-    UINT32 ULR;       /**< User mode lr register */
-    UINT32 R0;
-    UINT32 R1;
-    UINT32 R2;
-    UINT32 R3;
-    UINT32 R12;
-    UINT32 LR;
-    UINT32 PC;
-    UINT32 regCPSR;
+    UINT32 resved;          /* It's stack 8 aligned */
+    UINT32 regPSR;
+    UINT32 R[GEN_REGS_NUM]; /* R0-R12 */
+    UINT32 SP;              /* R13 */
+    UINT32 LR;              /* R14 */
+    UINT32 PC;              /* R15 */
 } TaskContext;

 typedef struct {
-    UINT32 reserved2; /**< Multiplexing registers, used in interrupts and system calls but with different meanings */
-    UINT32 reserved1; /**< Multiplexing registers, used in interrupts and system calls but with different meanings */
-    UINT32 USP;       /**< User mode sp register */
-    UINT32 ULR;       /**< User mode lr register */
-    UINT32 R0;
-    UINT32 R1;
-    UINT32 R2;
-    UINT32 R3;
-    UINT32 R12;
-    UINT32 LR;
-    UINT32 PC;
-    UINT32 regCPSR;
-} IrqContext;
+#if !defined(LOSCFG_ARCH_FPU_DISABLE)
+    UINT64 D[FP_REGS_NUM]; /* D0-D31 */
+    UINT32 regFPSCR;       /* FPSCR */
+    UINT32 regFPEXC;       /* FPEXC */
+#endif
+    UINT32 resved;
+    TASK_IRQ_CONTEXT
+} TaskIrqContext;

 /*
 * Description : task stack initialization
@@ -102,9 +82,8 @@ typedef struct {
 * Return      : pointer to the task context
 */
 extern VOID *OsTaskStackInit(UINT32 taskID, UINT32 stackSize, VOID *topStack, BOOL initFlag);
-extern VOID OsUserCloneParentStack(VOID *childStack, UINTPTR parentTopOfStask, UINT32 parentStackSize);
-extern VOID OsUserTaskStackInit(TaskContext *context, UINTPTR taskEntry, UINTPTR stack);
-extern VOID OsInitSignalContext(VOID *sp, VOID *signalContext, UINTPTR sigHandler, UINT32 signo, UINT32 param);
+extern VOID OsUserCloneParentStack(LosTaskCB *childTaskCB, LosTaskCB *parentTaskCB);
+extern VOID OsUserTaskStackInit(TaskContext *context, TSK_ENTRY_FUNC taskEntry, UINTPTR stack);
 extern void arm_clean_cache_range(UINTPTR start, UINTPTR end);
 extern void arm_inv_cache_range(UINTPTR start, UINTPTR end);

--- a/arch/arm/arm/src/include/los_hwi_pri.h
+++ b/arch/arm/arm/src/include/los_hwi_pri.h
@@ -59,7 +59,7 @@ extern VOID OsIncHwiFormCnt(UINT32 index);
 extern UINT32 OsGetHwiFormCnt(UINT32 index);
 extern CHAR *OsGetHwiFormName(UINT32 index);
 extern VOID OsInterrupt(UINT32 intNum);
-extern VOID OsSyscallHandleInit(VOID);
+extern VOID SyscallHandleInit(VOID);

 #ifdef __cplusplus
 #if __cplusplus
--- a/arch/arm/arm/src/los_arch_mmu.c
+++ b/arch/arm/arm/src/los_arch_mmu.c
@@ -45,8 +45,11 @@
 #include "los_vm_boot.h"
 #include "los_mmu_descriptor_v6.h"

-
-#ifdef LOSCFG_KERNEL_MMU
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 __attribute__((aligned(MMU_DESCRIPTOR_L1_SMALL_ENTRY_NUMBERS))) \
    __attribute__((section(".bss.prebss.translation_table"))) UINT8 \
@@ -67,11 +70,6 @@ STATIC INLINE PTE_T *OsGetPte2BasePtr(PTE_T pte1)
    return LOS_PaddrToKVaddr(pa);
 }

-VADDR_T *OsGFirstTableGet(VOID)
-{
-    return (VADDR_T *)g_firstPageTable;
-}
-
 STATIC INLINE UINT32 OsUnmapL1Invalid(vaddr_t *vaddr, UINT32 *count)
 {
    UINT32 unmapCount;
@@ -148,6 +146,7 @@ STATIC VOID OsCvtPte2AttsToFlags(PTE_T l1Entry, PTE_T l2Entry, UINT32 *flags)

 STATIC VOID OsPutL2Table(const LosArchMmu *archMmu, UINT32 l1Index, paddr_t l2Paddr)
 {
+    LosVmPage *vmPage = NULL;
    UINT32 index;
    PTE_T ttEntry;
    /* check if any l1 entry points to this l2 table */
@@ -157,9 +156,8 @@ STATIC VOID OsPutL2Table(const LosArchMmu *archMmu, UINT32 l1Index, paddr_t l2Pa
            return;
        }
    }
-#ifdef LOSCFG_KERNEL_VM
    /* we can free this l2 table */
-    LosVmPage *vmPage = LOS_VmPageGet(l2Paddr);
+    vmPage = LOS_VmPageGet(l2Paddr);
    if (vmPage == NULL) {
        LOS_Panic("bad page table paddr %#x\n", l2Paddr);
        return;
@@ -167,9 +165,6 @@ STATIC VOID OsPutL2Table(const LosArchMmu *archMmu, UINT32 l1Index, paddr_t l2Pa

    LOS_ListDelete(&vmPage->node);
    LOS_PhysPageFree(vmPage);
-#else
-    (VOID)LOS_MemFree(OS_SYS_MEM_ADDR, LOS_PaddrToKVaddr(l2Paddr));
-#endif
 }

 STATIC VOID OsTryUnmapL1PTE(const LosArchMmu *archMmu, vaddr_t vaddr, UINT32 scanIndex, UINT32 scanCount)
@@ -375,14 +370,13 @@ STATIC UINT32 OsUnmapSection(LosArchMmu *archMmu, vaddr_t *vaddr, UINT32 *count)
    return MMU_DESCRIPTOR_L2_NUMBERS_PER_L1;
 }

+
 BOOL OsArchMmuInit(LosArchMmu *archMmu, VADDR_T *virtTtb)
 {
-#ifdef LOSCFG_KERNEL_VM
    if (OsAllocAsid(&archMmu->asid) != LOS_OK) {
        VM_ERR("alloc arch mmu asid failed");
        return FALSE;
    }
-#endif

    status_t retval = LOS_MuxInit(&archMmu->mtx, NULL);
    if (retval != LOS_OK) {
@@ -486,6 +480,7 @@ STATIC STATUS_T OsGetL2Table(LosArchMmu *archMmu, UINT32 l1Index, paddr_t *ppa)
    UINT32 index;
    PTE_T ttEntry;
    VADDR_T *kvaddr = NULL;
+    LosVmPage *vmPage = NULL;
    UINT32 l2Offset = (MMU_DESCRIPTOR_L2_SMALL_SIZE / MMU_DESCRIPTOR_L1_SMALL_L2_TABLES_PER_PAGE) *
        (l1Index & (MMU_DESCRIPTOR_L1_SMALL_L2_TABLES_PER_PAGE - 1));
    /* lookup an existing l2 page table */
@@ -498,22 +493,14 @@ STATIC STATUS_T OsGetL2Table(LosArchMmu *archMmu, UINT32 l1Index, paddr_t *ppa)
        }
    }

-#ifdef LOSCFG_KERNEL_VM
    /* not found: allocate one (paddr) */
-    LosVmPage *vmPage = LOS_PhysPageAlloc();
+    vmPage = LOS_PhysPageAlloc();
    if (vmPage == NULL) {
        VM_ERR("have no memory to save l2 page");
        return LOS_ERRNO_VM_NO_MEMORY;
    }
    LOS_ListAdd(&archMmu->ptList, &vmPage->node);
    kvaddr = OsVmPageToVaddr(vmPage);
-#else
-    kvaddr = LOS_MemAlloc(OS_SYS_MEM_ADDR, MMU_DESCRIPTOR_L2_SMALL_SIZE);
-    if (kvaddr == NULL) {
-        VM_ERR("have no memory to save l2 page");
-        return LOS_ERRNO_VM_NO_MEMORY;
-    }
-#endif
    (VOID)memset_s(kvaddr, MMU_DESCRIPTOR_L2_SMALL_SIZE, 0, MMU_DESCRIPTOR_L2_SMALL_SIZE);

    /* get physical address */
@@ -764,26 +751,21 @@ VOID LOS_ArchMmuContextSwitch(LosArchMmu *archMmu)
        ttbcr |= MMU_DESCRIPTOR_TTBCR_PD0;
    }

-#ifdef LOSCFG_KERNEL_VM
    /* from armv7a arm B3.10.4, we should do synchronization changes of ASID and TTBR. */
    OsArmWriteContextidr(LOS_GetKVmSpace()->archMmu.asid);
    ISB;
-#endif
    OsArmWriteTtbr0(ttbr);
    ISB;
    OsArmWriteTtbcr(ttbcr);
    ISB;
-#ifdef LOSCFG_KERNEL_VM
    if (archMmu) {
        OsArmWriteContextidr(archMmu->asid);
        ISB;
    }
-#endif
 }

 STATUS_T LOS_ArchMmuDestroy(LosArchMmu *archMmu)
 {
-#ifdef LOSCFG_KERNEL_VM
    LosVmPage *page = NULL;
    /* free all of the pages allocated in archMmu->ptList */
    while ((page = LOS_ListRemoveHeadType(&archMmu->ptList, LosVmPage, node)) != NULL) {
@@ -792,7 +774,6 @@ STATUS_T LOS_ArchMmuDestroy(LosArchMmu *archMmu)

    OsArmWriteTlbiasid(archMmu->asid);
    OsFreeAsid(archMmu->asid);
-#endif
    (VOID)LOS_MuxDestroy(&archMmu->mtx);
    return LOS_OK;
 }
@@ -825,34 +806,38 @@ STATIC VOID OsSwitchTmpTTB(VOID)
    ISB;
 }

-STATIC VOID OsSetKSectionAttr(UINTPTR virtAddr, BOOL uncached)
+VADDR_T *OsGFirstTableGet()
+{
+    return (VADDR_T *)g_firstPageTable;
+}
+
+STATIC VOID OsSetKSectionAttr(VOID)
 {
-    UINT32 offset = virtAddr - KERNEL_VMM_BASE;
    /* every section should be page aligned */
-    UINTPTR textStart = (UINTPTR)&__text_start + offset;
-    UINTPTR textEnd = (UINTPTR)&__text_end + offset;
-    UINTPTR rodataStart = (UINTPTR)&__rodata_start + offset;
-    UINTPTR rodataEnd = (UINTPTR)&__rodata_end + offset;
-    UINTPTR ramDataStart = (UINTPTR)&__ram_data_start + offset;
-    UINTPTR bssEnd = (UINTPTR)&__bss_end + offset;
+    UINTPTR textStart = (UINTPTR)&__text_start;
+    UINTPTR textEnd = (UINTPTR)&__text_end;
+    UINTPTR rodataStart = (UINTPTR)&__rodata_start;
+    UINTPTR rodataEnd = (UINTPTR)&__rodata_end;
+    UINTPTR ramDataStart = (UINTPTR)&__ram_data_start;
+    UINTPTR bssEnd = (UINTPTR)&__bss_end;
    UINT32 bssEndBoundary = ROUNDUP(bssEnd, MB);
    LosArchMmuInitMapping mmuKernelMappings[] = {
        {
-            .phys = SYS_MEM_BASE + textStart - virtAddr,
+            .phys = SYS_MEM_BASE + textStart - KERNEL_VMM_BASE,
            .virt = textStart,
            .size = ROUNDUP(textEnd - textStart, MMU_DESCRIPTOR_L2_SMALL_SIZE),
            .flags = VM_MAP_REGION_FLAG_PERM_READ | VM_MAP_REGION_FLAG_PERM_EXECUTE,
            .name = "kernel_text"
        },
        {
-            .phys = SYS_MEM_BASE + rodataStart - virtAddr,
+            .phys = SYS_MEM_BASE + rodataStart - KERNEL_VMM_BASE,
            .virt = rodataStart,
            .size = ROUNDUP(rodataEnd - rodataStart, MMU_DESCRIPTOR_L2_SMALL_SIZE),
            .flags = VM_MAP_REGION_FLAG_PERM_READ,
            .name = "kernel_rodata"
        },
        {
-            .phys = SYS_MEM_BASE + ramDataStart - virtAddr,
+            .phys = SYS_MEM_BASE + ramDataStart - KERNEL_VMM_BASE,
            .virt = ramDataStart,
            .size = ROUNDUP(bssEndBoundary - ramDataStart, MMU_DESCRIPTOR_L2_SMALL_SIZE),
            .flags = VM_MAP_REGION_FLAG_PERM_READ | VM_MAP_REGION_FLAG_PERM_WRITE,
@@ -862,29 +847,26 @@ STATIC VOID OsSetKSectionAttr(UINTPTR virtAddr, BOOL uncached)
    LosVmSpace *kSpace = LOS_GetKVmSpace();
    status_t status;
    UINT32 length;
+    paddr_t oldTtPhyBase;
    int i;
    LosArchMmuInitMapping *kernelMap = NULL;
    UINT32 kmallocLength;
-    UINT32 flags;

    /* use second-level mapping of default READ and WRITE */
    kSpace->archMmu.virtTtb = (PTE_T *)g_firstPageTable;
    kSpace->archMmu.physTtb = LOS_PaddrQuery(kSpace->archMmu.virtTtb);
-    status = LOS_ArchMmuUnmap(&kSpace->archMmu, virtAddr,
-                               (bssEndBoundary - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT);
-    if (status != ((bssEndBoundary - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT)) {
+    status = LOS_ArchMmuUnmap(&kSpace->archMmu, KERNEL_VMM_BASE,
+                               (bssEndBoundary - KERNEL_VMM_BASE) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT);
+    if (status != ((bssEndBoundary - KERNEL_VMM_BASE) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT)) {
        VM_ERR("unmap failed, status: %d", status);
        return;
    }

-    flags = VM_MAP_REGION_FLAG_PERM_READ | VM_MAP_REGION_FLAG_PERM_WRITE | VM_MAP_REGION_FLAG_PERM_EXECUTE;
-    if (uncached) {
-        flags |= VM_MAP_REGION_FLAG_UNCACHED;
-    }
-    status = LOS_ArchMmuMap(&kSpace->archMmu, virtAddr, SYS_MEM_BASE,
-                             (textStart - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT,
-                             flags);
-    if (status != ((textStart - virtAddr) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT)) {
+    status = LOS_ArchMmuMap(&kSpace->archMmu, KERNEL_VMM_BASE, SYS_MEM_BASE,
+                             (textStart - KERNEL_VMM_BASE) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT,
+                             VM_MAP_REGION_FLAG_PERM_READ | VM_MAP_REGION_FLAG_PERM_WRITE |
+                             VM_MAP_REGION_FLAG_PERM_EXECUTE);
+    if (status != ((textStart - KERNEL_VMM_BASE) >> MMU_DESCRIPTOR_L2_SMALL_SHIFT)) {
        VM_ERR("mmap failed, status: %d", status);
        return;
    }
@@ -892,9 +874,6 @@ STATIC VOID OsSetKSectionAttr(UINTPTR virtAddr, BOOL uncached)
    length = sizeof(mmuKernelMappings) / sizeof(LosArchMmuInitMapping);
    for (i = 0; i < length; i++) {
        kernelMap = &mmuKernelMappings[i];
-        if (uncached) {
-            kernelMap->flags |= VM_MAP_REGION_FLAG_UNCACHED;
-        }
        status = LOS_ArchMmuMap(&kSpace->archMmu, kernelMap->virt, kernelMap->phys,
                                 kernelMap->size >> MMU_DESCRIPTOR_L2_SMALL_SHIFT, kernelMap->flags);
        if (status != (kernelMap->size >> MMU_DESCRIPTOR_L2_SMALL_SHIFT)) {
@@ -904,29 +883,16 @@ STATIC VOID OsSetKSectionAttr(UINTPTR virtAddr, BOOL uncached)
        LOS_VmSpaceReserve(kSpace, kernelMap->size, kernelMap->virt);
    }

-    kmallocLength = virtAddr + SYS_MEM_SIZE_DEFAULT - bssEndBoundary;
-    flags = VM_MAP_REGION_FLAG_PERM_READ | VM_MAP_REGION_FLAG_PERM_WRITE;
-    if (uncached) {
-        flags |= VM_MAP_REGION_FLAG_UNCACHED;
-    }
+    kmallocLength = KERNEL_VMM_BASE + SYS_MEM_SIZE_DEFAULT - bssEndBoundary;
    status = LOS_ArchMmuMap(&kSpace->archMmu, bssEndBoundary,
-                             SYS_MEM_BASE + bssEndBoundary - virtAddr,
+                             SYS_MEM_BASE + bssEndBoundary - KERNEL_VMM_BASE,
                             kmallocLength >> MMU_DESCRIPTOR_L2_SMALL_SHIFT,
-                             flags);
+                             VM_MAP_REGION_FLAG_PERM_READ | VM_MAP_REGION_FLAG_PERM_WRITE);
    if (status != (kmallocLength >> MMU_DESCRIPTOR_L2_SMALL_SHIFT)) {
        VM_ERR("mmap failed, status: %d", status);
        return;
    }
    LOS_VmSpaceReserve(kSpace, kmallocLength, bssEndBoundary);
-}
-
-STATIC VOID OsKSectionNewAttrEnable(VOID)
-{
-    LosVmSpace *kSpace = LOS_GetKVmSpace();
-    paddr_t oldTtPhyBase;
-
-    kSpace->archMmu.virtTtb = (PTE_T *)g_firstPageTable;
-    kSpace->archMmu.physTtb = LOS_PaddrQuery(kSpace->archMmu.virtTtb);

    /* we need free tmp ttbase */
    oldTtPhyBase = OsArmReadTtbr0();
@@ -960,10 +926,14 @@ VOID OsInitMappingStartUp(VOID)

    OsSwitchTmpTTB();

-    OsSetKSectionAttr(KERNEL_VMM_BASE, FALSE);
-    OsSetKSectionAttr(UNCACHED_VMM_BASE, TRUE);
-    OsKSectionNewAttrEnable();
+    OsSetKSectionAttr();
+
+    OsArchMmuInitPerCPU();
 }
-#endif

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */

--- a/arch/arm/arm/src/los_asid.c
+++ b/arch/arm/arm/src/los_asid.c
@@ -39,8 +39,11 @@
 #include "los_spinlock.h"
 #include "los_mmu_descriptor_v6.h"

-
-#ifdef LOSCFG_KERNEL_VM
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 STATIC SPIN_LOCK_INIT(g_cpuAsidLock);
 STATIC UINTPTR g_asidPool[BITMAP_NUM_WORDS(1UL << MMU_ARM_ASID_BITS)];
@@ -69,5 +72,9 @@ VOID OsFreeAsid(UINT32 asid)
    LOS_BitmapClrNBits(g_asidPool, asid, 1);
    LOS_SpinUnlockRestore(&g_cpuAsidLock, flags);
 }
-#endif

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/arch/arm/arm/src/los_dispatch.S
+++ b/arch/arm/arm/src/los_dispatch.S
@@ -32,7 +32,6 @@
 #include "asm.h"
 #include "arch_config.h"

-    .extern   OsSaveSignalContext
    .extern   OsSchedToUserReleaseLock
    .global   OsTaskSchedule
    .global   OsTaskContextLoad
@@ -86,16 +85,17 @@
 */
 OsTaskSchedule:
    MRS      R2, CPSR
+    STMFD    SP!, {LR}
+    STMFD    SP!, {LR}
+    /* jump sp */
+    SUB      SP, SP, #4
+
+    /* push r0-r12*/
+    STMFD    SP!, {R0-R12}
    STMFD    SP!, {R2}
-    STMFD    SP!, {LR}
-    STMFD    SP!, {LR}
-    STMFD    SP!, {R12}

-    /* jump R0 - R3 USP, ULR reserved */
-    SUB      SP, SP, #(8 * 4)
-
-    /* push R4 - R11*/
-    STMFD    SP!, {R4-R11}
+    /* 8 bytes stack align */
+    SUB      SP, SP, #4

    /* save fpu registers */
    PUSH_FPU_REGS   R2
@@ -113,86 +113,131 @@ OsTaskContextLoad:
    /* restore fpu registers */
    POP_FPU_REGS    R2

-    LDMFD   SP!, {R4-R11}
-    LDR     R3, [SP, #(11 * 4)]
-    AND     R0, R3, #CPSR_MASK_MODE
+    /* 8 bytes stack align */
+    ADD     SP, SP, #4
+
+    LDMFD   SP!, {R0}
+    MOV     R4, R0
+    AND     R0, R0, #CPSR_MASK_MODE
    CMP     R0, #CPSR_USER_MODE
    BNE     OsKernelTaskLoad

-    MVN     R2, #CPSR_INT_DISABLE
-    AND     R3, R3, R2
-    STR     R3, [SP, #(11 * 4)]
-
 #ifdef LOSCFG_KERNEL_SMP
+    /* 8 bytes stack align */
+    SUB     SP, SP, #4
    BL      OsSchedToUserReleaseLock
+    ADD     SP, SP, #4
 #endif

-    /* jump sp, reserved */
-    ADD     SP, SP, #(2 * 4)
+    MVN     R3, #CPSR_INT_DISABLE
+    AND     R4, R4, R3
+    MSR     SPSR_cxsf, R4
+
+    /* restore r0-r12, lr */
+    LDMFD   SP!, {R0-R12}
    LDMFD   SP, {R13, R14}^
    ADD     SP, SP, #(2 * 4)
-    LDMFD   SP!, {R0-R3, R12, LR}
-    RFEIA   SP!
+    LDMFD   SP!, {PC}^

 OsKernelTaskLoad:
-    ADD     SP, SP, #(4 * 4)
-    LDMFD   SP!, {R0-R3, R12, LR}
-    RFEIA   SP!
+    MSR     SPSR_cxsf, R4
+    /* restore r0-r12, lr */
+    LDMFD   SP!, {R0-R12}
+    ADD     SP, SP, #4
+    LDMFD   SP!, {LR, PC}^

 OsIrqHandler:
    SUB     LR, LR, #4

-    /* Save pc and cpsr to svc sp, ARMv6 and above support */
-    SRSFD   #0x13!
+    /* push r0-r3 to irq stack */
+    STMFD   SP, {R0-R3}
+    SUB     R0, SP, #(4 * 4)
+    MRS     R1, SPSR
+    MOV     R2, LR
+
    /* disable irq, switch to svc mode */
    CPSID   i, #0x13

-    STMFD   SP!, {R0-R3, R12, LR}
+    /* push spsr and pc in svc stack */
+    STMFD   SP!, {R1, R2}
+    STMFD   SP, {LR}
+
+    AND     R3, R1, #CPSR_MASK_MODE
+    CMP     R3, #CPSR_USER_MODE
+    BNE     OsIrqFromKernel
+
+    /* push user sp, lr in svc stack */
    STMFD   SP, {R13, R14}^
-    SUB     SP, SP, #(4 * 4)
-    STR     R4, [SP, #0]
+
+OsIrqFromKernel:
+    /* from svc not need save sp and lr */
+    SUB     SP, SP, #(2 * 4)
+
+    /* pop r0-r3 form irq stack*/
+    LDMFD   R0, {R0-R3}
+
+    /* push caller saved regs as trashed regs in svc stack */
+    STMFD   SP!, {R0-R3, R12}
+
+    /* 8 bytes stack align */
+    SUB     SP, SP, #4

    /*
     * save fpu regs in case in case those been
     * altered in interrupt handlers.
     */
    PUSH_FPU_REGS   R0
-
+#ifdef LOSCFG_IRQ_USE_STANDALONE_STACK
+    PUSH    {R4}
    MOV     R4, SP
    EXC_SP_SET __svc_stack_top, OS_EXC_SVC_STACK_SIZE, R1, R2
+#endif

    BLX     HalIrqHandler

+#ifdef LOSCFG_IRQ_USE_STANDALONE_STACK
    MOV     SP, R4
+    POP     {R4}
+#endif

    /* process pending signals */
-    BLX     OsTaskProcSignal
-    BLX     OsSchedIrqEndCheckNeedSched
+    BL      OsTaskProcSignal
+
+    BL      OsSchedIrqEndCheckNeedSched
+
+    MOV     R0,SP
+    MOV     R1,R7
+    BL      OsSaveSignalContextIrq

    /* restore fpu regs */
-    POP_FPU_REGS R0
-    LDR   R4, [SP, #0]
+    POP_FPU_REGS    R0

-    /* Obtain the CPSR to determine the mode the system is in when the interrupt is triggered */
-    LDR     R3, [SP, #(11 * 4)]
-    AND     R1, R3, #CPSR_MASK_MODE
-    CMP     R1, #CPSR_USER_MODE
-    BNE     1f
+    ADD     SP, SP, #4
+
+OsIrqContextRestore:
+    LDR     R0, [SP, #(4 * 7)]
+    MSR     SPSR_cxsf, R0
+    AND     R0, R0, #CPSR_MASK_MODE
+    CMP     R0, #CPSR_USER_MODE
+
+    LDMFD   SP!, {R0-R3, R12}
+
+    BNE     OsIrqContextRestoreToKernel

-    MOV     R0, SP
-    STR     R7, [SP, #0]
-    /* sp - sizeof(IrqContext) */
-    SUB     SP, SP, #(12 * 4)
-    MOV     R1, SP
-    BLX     OsSaveSignalContext
-    MOV     SP, R0
-1:
-    ADD     SP, SP, #(2 * 4)
    /* load user sp and lr, and jump cpsr */
    LDMFD   SP, {R13, R14}^
-    ADD     SP, SP, #(2 * 4)
-    LDMFD   SP!, {R0-R3, R12, LR}
-    RFEIA   SP!
+    ADD     SP, SP, #(3 * 4)
+
+    /* return to user mode */
+    LDMFD   SP!, {PC}^
+
+OsIrqContextRestoreToKernel:
+    /* svc mode not load sp */
+    ADD     SP, SP, #4
+    LDMFD   SP!, {LR}
+    /* jump cpsr and return to svc mode */
+    ADD     SP, SP, #4
+    LDMFD   SP!, {PC}^

 FUNCTION(ArchSpinLock)
    mov     r1, #1
--- a/arch/arm/arm/src/los_exc.c
+++ b/arch/arm/arm/src/los_exc.c
@@ -34,9 +34,12 @@
 #include "los_printf_pri.h"
 #include "los_task_pri.h"
 #include "los_hw_pri.h"
-#ifdef LOSCFG_SAVE_EXCINFO
+#ifdef LOSCFG_SHELL_EXCINFO
 #include "los_excinfo_pri.h"
 #endif
+#ifdef LOSCFG_EXC_INTERACTION
+#include "los_exc_interaction_pri.h"
+#endif
 #include "los_sys_stack_pri.h"
 #include "los_stackinfo_pri.h"
 #ifdef LOSCFG_COREDUMP
@@ -52,9 +55,7 @@
 #include "los_vm_phys.h"
 #include "los_vm_fault.h"
 #include "los_vm_common.h"
-#ifdef LOSCFG_KERNEL_DYNLOAD
 #include "los_load_elf.h"
-#endif
 #include "arm.h"
 #include "los_bitmap.h"
 #include "los_process_pri.h"
@@ -63,6 +64,11 @@
 #include "console.h"
 #endif

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 #define INVALID_CPUID  0xFFFF
 #define OS_EXC_VMM_NO_REGION  0x0U
@@ -101,7 +107,11 @@ STATIC UINT32 g_nextExcWaitCpu = INVALID_CPUID;
                            (IS_ALIGNED((ptr), sizeof(CHAR *))))

 STATIC const StackInfo g_excStack[] = {
+    { &__undef_stack, OS_EXC_UNDEF_STACK_SIZE, "udf_stack" },
+    { &__abt_stack,   OS_EXC_ABT_STACK_SIZE,   "abt_stack" },
+    { &__fiq_stack,   OS_EXC_FIQ_STACK_SIZE,   "fiq_stack" },
    { &__svc_stack,   OS_EXC_SVC_STACK_SIZE,   "svc_stack" },
+    { &__irq_stack,   OS_EXC_IRQ_STACK_SIZE,   "irq_stack" },
    { &__exc_stack,   OS_EXC_STACK_SIZE,       "exc_stack" }
 };

@@ -175,32 +185,20 @@ STATIC INT32 OsDecodeDataFSR(UINT32 regDFSR)
    return ret;
 }

-#ifdef LOSCFG_KERNEL_VM
 UINT32 OsArmSharedPageFault(UINT32 excType, ExcContext *frame, UINT32 far, UINT32 fsr)
 {
-    BOOL instructionFault = FALSE;
+    PRINT_INFO("page fault entry!!!\n");
+    BOOL instruction_fault = FALSE;
    UINT32 pfFlags = 0;
    UINT32 fsrFlag;
    BOOL write = FALSE;
-    UINT32 ret;

-    PRINT_INFO("page fault entry!!!\n");
    if (OsGetSystemStatus() == OS_SYSTEM_EXC_CURR_CPU) {
        return LOS_ERRNO_VM_NOT_FOUND;
    }
-#if defined(LOSCFG_KERNEL_SMP) && defined(LOSCFG_DEBUG_VERSION)
-    BOOL irqEnable = !(LOS_SpinHeld(&g_taskSpin) && (OsPercpuGet()->taskLockCnt != 0));
-    if (irqEnable) {
-        ArchIrqEnable();
-    } else {
-        PrintExcInfo("[ERR][%s] may be held scheduler lock when entering [%s] on cpu [%u]\n",
-                     OsCurrTaskGet()->taskName, __FUNCTION__, ArchCurrCpuid());
-    }
-#else
-    ArchIrqEnable();
-#endif
+
    if (excType == OS_EXCEPT_PREFETCH_ABORT) {
-        instructionFault = TRUE;
+        instruction_fault = TRUE;
    } else {
        write = !!BIT_GET(fsr, WNR_BIT);
    }
@@ -218,25 +216,14 @@ UINT32 OsArmSharedPageFault(UINT32 excType, ExcContext *frame, UINT32 far, UINT3
            BOOL user = (frame->regCPSR & CPSR_MODE_MASK) == CPSR_MODE_USR;
            pfFlags |= write ? VM_MAP_PF_FLAG_WRITE : 0;
            pfFlags |= user ? VM_MAP_PF_FLAG_USER : 0;
-            pfFlags |= instructionFault ? VM_MAP_PF_FLAG_INSTRUCTION : 0;
+            pfFlags |= instruction_fault ? VM_MAP_PF_FLAG_INSTRUCTION : 0;
            pfFlags |= VM_MAP_PF_FLAG_NOT_PRESENT;
-            ret = OsVmPageFaultHandler(far, pfFlags, frame);
-            break;
+            return OsVmPageFaultHandler(far, pfFlags, frame);
        }
        default:
-            ret = LOS_ERRNO_VM_NOT_FOUND;
-            break;
+            return LOS_ERRNO_VM_NOT_FOUND;
    }
-#if defined(LOSCFG_KERNEL_SMP) && defined(LOSCFG_DEBUG_VERSION)
-    if (irqEnable) {
-        ArchIrqDisable();
-    }
-#else
-    ArchIrqDisable();
-#endif
-    return ret;
 }
-#endif

 STATIC VOID OsExcType(UINT32 excType, ExcContext *excBufAddr, UINT32 far, UINT32 fsr)
 {
@@ -269,7 +256,6 @@ STATIC const CHAR *g_excTypeString[] = {
    "irq"
 };

-#ifdef LOSCFG_KERNEL_VM
 STATIC VADDR_T OsGetTextRegionBase(LosVmMapRegion *region, LosProcessCB *runProcess)
 {
    struct file *curFilep = NULL;
@@ -297,52 +283,41 @@ STATIC VADDR_T OsGetTextRegionBase(LosVmMapRegion *region, LosProcessCB *runProc
    } while (!strcmp(curFilep->f_path, lastFilep->f_path));

 DONE:
-#ifdef LOSCFG_KERNEL_DYNLOAD
    if (curRegion->range.base == EXEC_MMAP_BASE) {
        return 0;
    }
-#endif
    return curRegion->range.base;
 }
-#endif

 STATIC VOID OsExcSysInfo(UINT32 excType, const ExcContext *excBufAddr)
 {
    LosTaskCB *runTask = OsCurrTaskGet();
    LosProcessCB *runProcess = OsCurrProcessGet();
+    LosVmMapRegion *region = NULL;

    PrintExcInfo("excType: %s\n"
                 "processName       = %s\n"
                 "processID         = %u\n"
-#ifdef LOSCFG_KERNEL_VM
                 "process aspace    = 0x%08x -> 0x%08x\n"
-#endif
                 "taskName          = %s\n"
                 "taskID            = %u\n",
                 g_excTypeString[excType],
                 runProcess->processName,
                 runProcess->processID,
-#ifdef LOSCFG_KERNEL_VM
                 runProcess->vmSpace->base,
                 runProcess->vmSpace->base + runProcess->vmSpace->size,
-#endif
                 runTask->taskName,
                 runTask->taskID);

-#ifdef LOSCFG_KERNEL_VM
    if (OsProcessIsUserMode(runProcess)) {
        PrintExcInfo("task user stack   = 0x%08x -> 0x%08x\n",
                     runTask->userMapBase, runTask->userMapBase + runTask->userMapSize);
-    } else
-#endif
-    {
+    } else {
        PrintExcInfo("task kernel stack = 0x%08x -> 0x%08x\n",
                     runTask->topOfStack, runTask->topOfStack + runTask->stackSize);
    }

    PrintExcInfo("pc    = 0x%x ", excBufAddr->PC);
-#ifdef LOSCFG_KERNEL_VM
-    LosVmMapRegion *region = NULL;
    if (g_excFromUserMode[ArchCurrCpuid()] == TRUE) {
        if (LOS_IsUserAddress((vaddr_t)excBufAddr->PC)) {
            region = LOS_RegionFind(runProcess->vmSpace, (VADDR_T)excBufAddr->PC);
@@ -359,9 +334,7 @@ STATIC VOID OsExcSysInfo(UINT32 excType, const ExcContext *excBufAddr)
                         (VADDR_T)excBufAddr->ULR - OsGetTextRegionBase(region, runProcess));
        }
        PrintExcInfo("\nusp   = 0x%x", excBufAddr->USP);
-    } else
-#endif
-    {
+    } else {
        PrintExcInfo("\nklr   = 0x%x\n"
                     "ksp   = 0x%x\n",
                     excBufAddr->LR,
@@ -413,7 +386,6 @@ EXC_PROC_FUNC OsExcRegHookGet(VOID)
    return g_excHook;
 }

-#ifdef LOSCFG_KERNEL_VM
 STATIC VOID OsDumpExcVaddrRegion(LosVmSpace *space, LosVmMapRegion *region)
 {
    INT32 i, numPages, pageCount;
@@ -499,7 +471,6 @@ STATIC VOID OsDumpProcessUsedMemNode(UINT16 vmmFalgs)
    OsDumpProcessUsedMemRegion(runProcess, runspace, vmmFalgs);
    return;
 }
-#endif

 VOID OsDumpContextMem(const ExcContext *excBufAddr)
 {
@@ -522,7 +493,7 @@ VOID OsDumpContextMem(const ExcContext *excBufAddr)
    }
 }

-STATIC VOID OsExcRestore(VOID)
+STATIC VOID OsExcRestore(UINTPTR taskStackPointer)
 {
    UINT32 currCpuID = ArchCurrCpuid();

@@ -533,6 +504,8 @@ STATIC VOID OsExcRestore(VOID)
    OsPercpuGet()->excFlag = CPU_RUNNING;
 #endif
    OsPercpuGet()->taskLockCnt = 0;
+
+    OsSetCurrCpuSp(taskStackPointer);
 }

 STATIC VOID OsUserExcHandle(ExcContext *excBufAddr)
@@ -559,20 +532,19 @@ STATIC VOID OsUserExcHandle(ExcContext *excBufAddr)
 #endif
    runProcess->processStatus &= ~OS_PROCESS_FLAG_EXIT;

+    OsExcRestore(excBufAddr->SP);
+
 #if (LOSCFG_KERNEL_SMP == YES)
 #ifdef LOSCFG_FS_VFS
    OsWakeConsoleSendTask();
 #endif
 #endif

-#ifdef LOSCFG_SAVE_EXCINFO
+#ifdef LOSCFG_SHELL_EXCINFO
    OsProcessExitCodeCoreDumpSet(runProcess);
 #endif
    OsProcessExitCodeSignalSet(runProcess, SIGUSR2);

-    /* Exception handling All operations should be kept prior to that operation */
-    OsExcRestore();
-
    /* kill user exc process */
    LOS_Exit(OS_PRO_EXIT_OK);

@@ -585,17 +557,18 @@ STATIC VOID OsUserExcHandle(ExcContext *excBufAddr)
 /* this function is used to validate fp or validate the checking range start and end. */
 STATIC INLINE BOOL IsValidFP(UINTPTR regFP, UINTPTR start, UINTPTR end, vaddr_t *vaddr)
 {
+    LosProcessCB *runProcess = NULL;
+    LosVmSpace *runspace = NULL;
    VADDR_T kvaddr = regFP;
+    PADDR_T paddr;

    if (!((regFP > start) && (regFP < end) && IS_ALIGNED(regFP, sizeof(CHAR *)))) {
        return FALSE;
    }

-#ifdef LOSCFG_KERNEL_VM
-    PADDR_T paddr;
    if (g_excFromUserMode[ArchCurrCpuid()] == TRUE) {
-        LosProcessCB *runProcess = OsCurrProcessGet();
-        LosVmSpace *runspace = runProcess->vmSpace;
+        runProcess = OsCurrProcessGet();
+        runspace = runProcess->vmSpace;
        if (runspace == NULL) {
            return FALSE;
        }
@@ -606,7 +579,6 @@ STATIC INLINE BOOL IsValidFP(UINTPTR regFP, UINTPTR start, UINTPTR end, vaddr_t

        kvaddr = (PADDR_T)(UINTPTR)LOS_PaddrToKVaddr(paddr);
    }
-#endif
    if (vaddr != NULL) {
        *vaddr = kvaddr;
    }
@@ -675,8 +647,8 @@ VOID BackTraceSub(UINTPTR regFP)
    UINTPTR stackStart, stackEnd;
    UINTPTR backFP = regFP;
    UINT32 count = 0;
+    LosVmMapRegion *region = NULL;
    VADDR_T kvaddr;
-    LosProcessCB *runProcess = OsCurrProcessGet();

    if (FindSuitableStack(regFP, &stackStart, &stackEnd, &kvaddr) == FALSE) {
        PrintExcInfo("traceback error fp = 0x%x\n", regFP);
@@ -698,33 +670,28 @@ VOID BackTraceSub(UINTPTR regFP)
    while (IsValidFP(backFP, stackStart, stackEnd, &kvaddr) == TRUE) {
        tmpFP = backFP;
 #ifdef LOSCFG_COMPILER_CLANG_LLVM
-	backFP = *(UINTPTR *)(UINTPTR)kvaddr;
+        backFP = *(UINTPTR *)(UINTPTR)kvaddr;
        if (IsValidFP(tmpFP + POINTER_SIZE, stackStart, stackEnd, &kvaddr) == FALSE) {
            PrintExcInfo("traceback backLR check failed, backLP: 0x%x\n", tmpFP + POINTER_SIZE);
            return;
        }
        backLR = *(UINTPTR *)(UINTPTR)kvaddr;
 #else
-	backLR = *(UINTPTR *)(UINTPTR)kvaddr;
+        backLR = *(UINTPTR *)(UINTPTR)kvaddr;
        if (IsValidFP(tmpFP - POINTER_SIZE, stackStart, stackEnd, &kvaddr) == FALSE) {
            PrintExcInfo("traceback backFP check failed, backFP: 0x%x\n", tmpFP - POINTER_SIZE);
            return;
        }
        backFP = *(UINTPTR *)(UINTPTR)kvaddr;
 #endif
-#ifdef LOSCFG_KERNEL_VM
-        LosVmMapRegion *region = NULL;
        if (LOS_IsUserAddress((VADDR_T)backLR) == TRUE) {
-            region = LOS_RegionFind(runProcess->vmSpace, (VADDR_T)backLR);
+            region = LOS_RegionFind(OsCurrProcessGet()->vmSpace, (VADDR_T)backLR);
        }
        if (region != NULL) {
            PrintExcInfo("traceback %u -- lr = 0x%x    fp = 0x%x lr in %s --> 0x%x\n", count, backLR, backFP,
-                         OsGetRegionNameOrFilePath(region),
-                         backLR - OsGetTextRegionBase(region, runProcess));
+                         OsGetRegionNameOrFilePath(region), backLR - region->range.base);
            region = NULL;
-        } else
-#endif
-        {
+        } else {
            PrintExcInfo("traceback %u -- lr = 0x%x    fp = 0x%x\n", count, backLR, backFP);
        }
        count++;
@@ -759,9 +726,8 @@ VOID OsExcHook(UINT32 excType, ExcContext *excBufAddr, UINT32 far, UINT32 fsr)
 #ifndef LOSCFG_DEBUG_VERSION
    if (g_excFromUserMode[ArchCurrCpuid()] != TRUE) {
 #endif
-#ifdef LOSCFG_KERNEL_VM
        OsDumpProcessUsedMemNode(OS_EXC_VMM_NO_REGION);
-#endif
+
        OsExcStackInfo();
 #ifndef LOSCFG_DEBUG_VERSION
    }
@@ -821,7 +787,7 @@ VOID OsTaskBackTrace(UINT32 taskID)
    }
    PRINTK("TaskName = %s\n", taskCB->taskName);
    PRINTK("TaskID = 0x%x\n", taskCB->taskID);
-    BackTrace(((TaskContext *)(taskCB->stackPointer))->R11); /* R11 : FP */
+    BackTrace(((TaskContext *)(taskCB->stackPointer))->R[11]); /* R11 : FP */
 }

 VOID OsBackTrace(VOID)
@@ -958,7 +924,7 @@ STATIC VOID OsWaitOtherCoresHandleExcEnd(UINT32 currCpuID)
    }
 }

-STATIC VOID OsCheckAllCpuStatus(VOID)
+STATIC VOID OsCheckAllCpuStatus(UINTPTR taskStackPointer)
 {
    UINT32 currCpuID = ArchCurrCpuid();
    UINT32 ret, target;
@@ -978,7 +944,7 @@ STATIC VOID OsCheckAllCpuStatus(VOID)
    } else if (g_excFromUserMode[currCpuID] == TRUE) {
        if (OsCurrProcessGet()->processID == g_currHandleExcPID) {
            LOS_SpinUnlock(&g_excSerializerSpin);
-            OsExcRestore();
+            OsExcRestore(taskStackPointer);
            while (1) {
                ret = LOS_TaskSuspend(OsCurrTaskGet()->taskID);
                PrintExcInfo("%s supend task :%u failed: 0x%x\n", __FUNCTION__, OsCurrTaskGet()->taskID, ret);
@@ -1006,11 +972,12 @@ STATIC VOID OsCheckAllCpuStatus(VOID)
 }
 #endif

-STATIC VOID OsCheckCpuStatus(VOID)
+STATIC VOID OsCheckCpuStatus(UINTPTR taskStackPointer)
 {
 #if (LOSCFG_KERNEL_SMP == YES)
-    OsCheckAllCpuStatus();
+    OsCheckAllCpuStatus(taskStackPointer);
 #else
+    (VOID)taskStackPointer;
    g_currHandleExcCpuID = ArchCurrCpuid();
 #endif
 }
@@ -1031,7 +998,7 @@ LITE_OS_SEC_TEXT VOID STATIC OsExcPriorDisposal(ExcContext *excBufAddr)
        g_excFromUserMode[ArchCurrCpuid()] = FALSE;
    }

-    OsCheckCpuStatus();
+    OsCheckCpuStatus(excBufAddr->SP);

    if (g_excFromUserMode[ArchCurrCpuid()] == TRUE) {
        while (1) {
@@ -1059,40 +1026,26 @@ LITE_OS_SEC_TEXT VOID STATIC OsExcPriorDisposal(ExcContext *excBufAddr)

 LITE_OS_SEC_TEXT_INIT STATIC VOID OsPrintExcHead(UINT32 far)
 {
-#ifdef LOSCFG_KERNEL_VM
+#ifdef LOSCFG_DEBUG_VERSION
+    LosVmSpace *space = NULL;
+    VADDR_T vaddr;
+#endif
+
    /* You are not allowed to add any other print information before this exception information */
    if (g_excFromUserMode[ArchCurrCpuid()] == TRUE) {
 #ifdef LOSCFG_DEBUG_VERSION
-        VADDR_T vaddr = ROUNDDOWN(far, PAGE_SIZE);
-        LosVmSpace *space = LOS_SpaceGet(vaddr);
+        vaddr = ROUNDDOWN(far, PAGE_SIZE);
+        space = LOS_SpaceGet(vaddr);
        if (space != NULL) {
            LOS_DumpMemRegion(vaddr);
        }
 #endif
        PrintExcInfo("##################excFrom: User!####################\n");
-    } else
-#endif
-    {
+    } else {
        PrintExcInfo("##################excFrom: kernel!###################\n");
    }
 }

-#ifdef LOSCFG_SAVE_EXCINFO
-STATIC VOID OsSysStateSave(UINT32 *intCount, UINT32 *lockCount)
-{
-    *intCount = g_intCount[ArchCurrCpuid()];
-    *lockCount = OsPercpuGet()->taskLockCnt;
-    g_intCount[ArchCurrCpuid()] = 0;
-    OsPercpuGet()->taskLockCnt = 0;
-}
-
-STATIC VOID OsSysStateRestore(UINT32 intCount, UINT32 lockCount)
-{
-    g_intCount[ArchCurrCpuid()] = intCount;
-    OsPercpuGet()->taskLockCnt = lockCount;
-}
-#endif
-
 /*
 * Description : EXC handler entry
 * Input       : excType    --- exc type
@@ -1100,11 +1053,6 @@ STATIC VOID OsSysStateRestore(UINT32 intCount, UINT32 lockCount)
 */
 LITE_OS_SEC_TEXT_INIT VOID OsExcHandleEntry(UINT32 excType, ExcContext *excBufAddr, UINT32 far, UINT32 fsr)
 {
-#ifdef LOSCFG_SAVE_EXCINFO
-    UINT32 intCount;
-    UINT32 lockCount;
-#endif
-
    /* Task scheduling is not allowed during exception handling */
    OsPercpuGet()->taskLockCnt++;

@@ -1118,18 +1066,18 @@ LITE_OS_SEC_TEXT_INIT VOID OsExcHandleEntry(UINT32 excType, ExcContext *excBufAd
    OsAllCpuStatusOutput();
 #endif

-#ifdef LOSCFG_SAVE_EXCINFO
+#ifdef LOSCFG_SHELL_EXCINFO
    log_read_write_fn func = GetExcInfoRW();
 #endif

    if (g_excHook != NULL) {
        if (g_curNestCount[ArchCurrCpuid()] == 1) {
-#ifdef LOSCFG_SAVE_EXCINFO
+#ifdef LOSCFG_SHELL_EXCINFO
            if (func != NULL) {
                SetExcInfoIndex(0);
-                OsSysStateSave(&intCount, &lockCount);
+                g_intCount[ArchCurrCpuid()] = 0;
                OsRecordExcInfoTime();
-                OsSysStateRestore(intCount, lockCount);
+                g_intCount[ArchCurrCpuid()] = 1;
            }
 #endif
            g_excHook(excType, excBufAddr, far, fsr);
@@ -1137,15 +1085,18 @@ LITE_OS_SEC_TEXT_INIT VOID OsExcHandleEntry(UINT32 excType, ExcContext *excBufAd
            OsCallStackInfo();
        }

-#ifdef LOSCFG_SAVE_EXCINFO
+#ifdef LOSCFG_SHELL_EXCINFO
        if (func != NULL) {
            PrintExcInfo("Be sure flash space bigger than GetExcInfoIndex():0x%x\n", GetExcInfoIndex());
-            OsSysStateSave(&intCount, &lockCount);
+            g_intCount[ArchCurrCpuid()] = 0;
            func(GetRecordAddr(), GetRecordSpace(), 0, GetExcInfoBuf());
-            OsSysStateRestore(intCount, lockCount);
+            g_intCount[ArchCurrCpuid()] = 1;
        }
 #endif
    }
+#ifdef LOSCFG_EXC_INTERACTION
+    OsExcInteractionTaskKeep();
+#endif

 #ifdef LOSCFG_SHELL_CMD_DEBUG
    SystemRebootFunc rebootHook = OsGetRebootHook();
@@ -1165,7 +1116,6 @@ __attribute__((noinline)) VOID LOS_Panic(const CHAR *fmt, ...)
    UartVprintf(fmt, ap);
    va_end(ap);
    __asm__ __volatile__("swi 0");
-    while (1);
 }

 /* stack protector */
@@ -1218,3 +1168,8 @@ VOID LOS_RecordLR(UINTPTR *LR, UINT32 LRSize, UINT32 recordCount, UINT32 jumpCou
    }
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/arch/arm/arm/src/los_hw.c
+++ b/arch/arm/arm/src/los_hw.c
@@ -32,6 +32,12 @@
 #include "los_hw_pri.h"
 #include "los_task_pri.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+
 /* support cpu vendors */
 CpuVendor g_cpuTable[] = {
    /* armv7-a */
@@ -71,10 +77,13 @@ VOID OsTaskEntrySetupLoopFrame(UINT32 arg0)

 LITE_OS_SEC_TEXT_INIT VOID *OsTaskStackInit(UINT32 taskID, UINT32 stackSize, VOID *topStack, BOOL initFlag)
 {
+    UINT32 index = 1;
+    TaskContext *taskContext = NULL;
+
    if (initFlag == TRUE) {
        OsStackInit(topStack, stackSize);
    }
-    TaskContext *taskContext = (TaskContext *)(((UINTPTR)topStack + stackSize) - sizeof(TaskContext));
+    taskContext = (TaskContext *)(((UINTPTR)topStack + stackSize) - sizeof(TaskContext));

    /* initialize the task context */
 #ifdef LOSCFG_GDB
@@ -83,17 +92,22 @@ LITE_OS_SEC_TEXT_INIT VOID *OsTaskStackInit(UINT32 taskID, UINT32 stackSize, VOI
    taskContext->PC = (UINTPTR)OsTaskEntry;
 #endif
    taskContext->LR = (UINTPTR)OsTaskExit;  /* LR should be kept, to distinguish it's THUMB or ARM instruction */
-    taskContext->R0 = taskID;               /* R0 */
+    taskContext->resved = 0x0;
+    taskContext->R[0] = taskID;             /* R0 */
+    taskContext->R[index++] = 0x01010101;   /* R1, 0x01010101 : reg initialed magic word */
+    for (; index < GEN_REGS_NUM; index++) {
+        taskContext->R[index] = taskContext->R[index - 1] + taskContext->R[1]; /* R2 - R12 */
+    }

 #ifdef LOSCFG_INTERWORK_THUMB
-    taskContext->regCPSR = PSR_MODE_SVC_THUMB; /* CPSR (Enable IRQ and FIQ interrupts, THUMNB-mode) */
+    taskContext->regPSR = PSR_MODE_SVC_THUMB; /* CPSR (Enable IRQ and FIQ interrupts, THUMNB-mode) */
 #else
-    taskContext->regCPSR = PSR_MODE_SVC_ARM;   /* CPSR (Enable IRQ and FIQ interrupts, ARM-mode) */
+    taskContext->regPSR = PSR_MODE_SVC_ARM;   /* CPSR (Enable IRQ and FIQ interrupts, ARM-mode) */
 #endif

 #if !defined(LOSCFG_ARCH_FPU_DISABLE)
    /* 0xAAA0000000000000LL : float reg initialed magic word */
-    for (UINT32 index = 0; index < FP_REGS_NUM; index++) {
+    for (index = 0; index < FP_REGS_NUM; index++) {
        taskContext->D[index] = 0xAAA0000000000000LL + index; /* D0 - D31 */
    }
    taskContext->regFPSCR = 0;
@@ -103,49 +117,58 @@ LITE_OS_SEC_TEXT_INIT VOID *OsTaskStackInit(UINT32 taskID, UINT32 stackSize, VOI
    return (VOID *)taskContext;
 }

-LITE_OS_SEC_TEXT VOID OsUserCloneParentStack(VOID *childStack, UINTPTR parentTopOfStack, UINT32 parentStackSize)
+LITE_OS_SEC_TEXT VOID OsUserCloneParentStack(LosTaskCB *childTaskCB, LosTaskCB *parentTaskCB)
 {
-    VOID *cloneStack = (VOID *)(((UINTPTR)parentTopOfStack + parentStackSize) - sizeof(TaskContext));
+    TaskContext *context = (TaskContext *)childTaskCB->stackPointer;
+    VOID *cloneStack = (VOID *)(((UINTPTR)parentTaskCB->topOfStack + parentTaskCB->stackSize) - sizeof(TaskContext));

-    (VOID)memcpy_s(childStack, sizeof(TaskContext), cloneStack, sizeof(TaskContext));
-    ((TaskContext *)childStack)->R0 = 0;
+    LOS_ASSERT(parentTaskCB->taskStatus & OS_TASK_STATUS_RUNNING);
+
+    (VOID)memcpy_s(childTaskCB->stackPointer, sizeof(TaskContext), cloneStack, sizeof(TaskContext));
+    context->R[0] = 0;
 }

-LITE_OS_SEC_TEXT_INIT VOID OsUserTaskStackInit(TaskContext *context, UINTPTR taskEntry, UINTPTR stack)
+LITE_OS_SEC_TEXT_INIT VOID OsUserTaskStackInit(TaskContext *context, TSK_ENTRY_FUNC taskEntry, UINTPTR stack)
 {
    LOS_ASSERT(context != NULL);

 #ifdef LOSCFG_INTERWORK_THUMB
-    context->regCPSR = PSR_MODE_USR_THUMB;
+    context->regPSR = PSR_MODE_USR_THUMB;
 #else
-    context->regCPSR = PSR_MODE_USR_ARM;
+    context->regPSR = PSR_MODE_USR_ARM;
 #endif
-    context->R0 = stack;
-    context->USP = TRUNCATE(stack, LOSCFG_STACK_POINT_ALIGN_SIZE);
-    context->ULR = 0;
+    context->R[0] = stack;
+    context->SP = TRUNCATE(stack, LOSCFG_STACK_POINT_ALIGN_SIZE);
+    context->LR = 0;
    context->PC = (UINTPTR)taskEntry;
 }

-VOID OsInitSignalContext(VOID *sp, VOID *signalContext, UINTPTR sigHandler, UINT32 signo, UINT32 param)
+VOID Sev(VOID)
 {
-    IrqContext *newSp = (IrqContext *)signalContext;
-    (VOID)memcpy_s(signalContext, sizeof(IrqContext), sp, sizeof(IrqContext));
-    newSp->PC = sigHandler;
-    newSp->R0 = signo;
-    newSp->R1 = param;
+    __asm__ __volatile__ ("sev" : : : "memory");
 }

-DEPRECATED VOID Dmb(VOID)
+VOID Wfe(VOID)
+{
+    __asm__ __volatile__ ("wfe" : : : "memory");
+}
+
+VOID Wfi(VOID)
+{
+    __asm__ __volatile__ ("wfi" : : : "memory");
+}
+
+VOID Dmb(VOID)
 {
    __asm__ __volatile__ ("dmb" : : : "memory");
 }

-DEPRECATED VOID Dsb(VOID)
+VOID Dsb(VOID)
 {
    __asm__ __volatile__("dsb" : : : "memory");
 }

-DEPRECATED VOID Isb(VOID)
+VOID Isb(VOID)
 {
    __asm__ __volatile__("isb" : : : "memory");
 }
@@ -169,3 +192,8 @@ VOID DCacheInvRange(UINT32 start, UINT32 end)
    arm_inv_cache_range(start, end);
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/arch/arm/arm/src/los_hw_exc.S
+++ b/arch/arm/arm/src/los_hw_exc.S
@@ -47,10 +47,9 @@
    .extern   OsDataAbortExcHandleEntry
 #endif
 #endif
-    .extern OsSaveSignalContext
-    .extern OsRestorSignalContext
    .extern OsArmSharedPageFault
    .extern OsArmA32SyscallHandle
+    .extern LOS_Exit

    .global   _osExceptFiqHdl
    .global   _osExceptAddrAbortHdl
@@ -64,6 +63,7 @@
    .global   __stack_chk_guard_setup
 #endif

+
    .fpu vfpv4

 .macro PUSH_FPU_REGS reg1
@@ -173,77 +173,67 @@ _osExceptUndefInstrHdl:
 #ifdef LOSCFG_GDB
    GDB_HANDLE OsUndefIncExcHandleEntry
 #else
-    SRSFD   #CPSR_SVC_MODE!                                   @ Save pc and cpsr to svc sp, ARMv6 and above support
-    MSR     CPSR_c, #(CPSR_INT_DISABLE | CPSR_SVC_MODE)       @ Switch to svc mode, and disable all interrupt
-    STMFD   SP!, {R0-R3, R12, LR}
-    STMFD   SP, {R13, R14}^                                   @ push user sp and lr
-    SUB     SP, SP, #(2 * 4)
-    MOV     R2, #0
-    MOV     R3, #0
-    STMFD   SP!, {R2-R3}                                      @ far and fsr fields, are 0 under this anomaly
-    STMFD   SP!, {R4-R11}
+                                                              @ LR offset to return from this exception:  0.
+    STMFD   SP, {R0-R7}                                       @ Push working registers, but don`t change SP.

    MOV     R0, #OS_EXCEPT_UNDEF_INSTR                        @ Set exception ID to OS_EXCEPT_UNDEF_INSTR.
+
    B       _osExceptDispatch                                 @ Branch to global exception handler.
+
 #endif

@ Description: Software interrupt exception handler
 _osExceptSwiHdl:
-    SRSFD   #CPSR_SVC_MODE!                                   @ Save pc and cpsr to svc sp, ARMv6 and above support
-    STMFD   SP!, {R0-R3, R12, LR}
-    STMFD   SP, {R13, R14}^
-    SUB     SP, SP, #(4 * 4)                                  @ push user sp and lr and jump reserved field
-    STR     R7, [SP, #0]                                      @ Save system call number to reserved2 filed
+    SUB     SP, SP, #(4 * 16)
+    STMIA   SP, {R0-R12}
+    MRS     R3, SPSR
+    MOV     R4, LR

-#ifdef LOSCFG_KERNEL_SYSCALL
-    LDR     R3, [SP, #(11 * 4)]
-    AND     R1, R3, #CPSR_MASK_MODE                           @ Interrupted mode
-    CMP     R1, #CPSR_USER_MODE                               @ User mode
-    BNE     _osKernelSVCHandler                               @ Branch if not user mode
+    AND     R1, R3, #CPSR_MASK_MODE                          @ Interrupted mode
+    CMP     R1, #CPSR_USER_MODE                              @ User mode
+    BNE     OsKernelSVCHandler                               @ Branch if not user mode

-    CMP     R7, #119                                          @ __NR_sigreturn
-    BNE     _osIsSyscall
+    @ we enter from user mode, we need get the values of  USER mode r13(sp) and r14(lr).
+    @ stmia with ^ will return the user mode registers (provided that r15 is not in the register list).
    MOV     R0, SP
-    BLX     OsRestorSignalContext
-    MOV     SP, R0
-    B       _osSyscallReturn
-
-_osIsSyscall:
-    STMFD   SP!, {R4-R11}
-
+    STMFD   SP!, {R3}                                        @ Save the CPSR
+    ADD     R3, SP, #(4 * 17)                                @ Offset to pc/cpsr storage
+    STMFD   R3!, {R4}                                        @ Save the CPSR and r15(pc)
+    STMFD   R3, {R13, R14}^                                  @ Save user mode r13(sp) and r14(lr)
+    SUB     SP, SP, #4
    PUSH_FPU_REGS R1

-    MOV     R0, SP
-    MOV     FP, #0                                            @ Init frame pointer
+    MOV     FP, #0                                           @ Init frame pointer
    CPSIE   I
    BLX     OsArmA32SyscallHandle
    CPSID   I

    POP_FPU_REGS R1
-    LDMFD   SP!, {R4-R11}
+    ADD     SP, SP,#4
+    LDMFD   SP!, {R3}                                        @ Fetch the return SPSR
+    MSR     SPSR_cxsf, R3                                    @ Set the return mode SPSR

-    MOV     R0, SP
-    SUB     SP, SP, #(12 * 4)                                @ sp - sizeof(IrqContext), reserved for signal
-    MOV     R1, SP
-    BLX     OsSaveSignalContext
-    MOV     SP, R0
+    @ we are leaving to user mode, we need to restore the values of USER mode r13(sp) and r14(lr).
+    @ ldmia with ^ will return the user mode registers (provided that r15 is not in the register list)

-_osSyscallReturn:
-    LDR     R7, [SP, #0]
-    ADD     SP, SP, #(2 * 4)                                 @ jump reserved filed
+    LDMFD   SP!, {R0-R12}
    LDMFD   SP, {R13, R14}^                                  @ Restore user mode R13/R14
    ADD     SP, SP, #(2 * 4)
-    LDMFD   SP!, {R0-R3, R12, LR}
-    RFEIA   SP!                                              @ Return to user
+    LDMFD   SP!, {PC}^                                       @ Return to user
+
+OsKernelSVCHandler:
+    ADD     R0, SP, #(4 * 16)
+    MOV     R5, R0
+    STMFD   R0!, {R4}                                        @ Store PC
+    STMFD   R0!, {R4}
+    STMFD   R0!, {R5}
+
+    STMFD   SP!, {R3}                                        @ Push task`s CPSR (i.e. exception SPSR).
+    SUB     SP, SP, #(4 * 2)                                 @ user sp and lr

-_osKernelSVCHandler:
-#endif
-    MOV     R0, #0
-    STR     R0, [SP, #0]
-    STR     R0, [SP, #4]
-    STMFD   SP!, {R4-R11}
    MOV     R0, #OS_EXCEPT_SWI                               @ Set exception ID to OS_EXCEPT_SWI.
-    B       _osExceptDispatch                                @ Branch to global exception handler.
+
+    B       _osExceptionSwi                                  @ Branch to global exception handler.

@ Description: Prefectch abort exception handler
 _osExceptPrefetchAbortHdl:
@@ -253,37 +243,18 @@ _osExceptPrefetchAbortHdl:
 #endif
 #else
    SUB     LR, LR, #4                                       @ LR offset to return from this exception: -4.
+    STMFD   SP, {R0-R7}                                      @ Push working registers, but don`t change SP.
+    MOV     R5, LR
+    MRS     R1, SPSR

-    SRSFD   #CPSR_SVC_MODE!                                  @ Save pc and cpsr to svc sp, ARMv6 and above support
-    MSR     CPSR_c, #(CPSR_INT_DISABLE | CPSR_SVC_MODE)      @ Switch to svc mode, and disable all interrupt
-    STMFD   SP!, {R0-R3, R12, LR}
-    STMFD   SP, {R13, R14}^
-    SUB     SP, SP, #(2 * 4)
+    MOV     R0, #OS_EXCEPT_PREFETCH_ABORT                    @ Set exception ID to OS_EXCEPT_PREFETCH_ABORT.

-    MRC     P15, 0, R2, C6, C0, 2
-    MRC     P15, 0, R3, C5, C0, 1
-    STMFD   SP!, {R2-R3}                                     @ Save far and fsr
-    STMFD   SP!, {R4-R11}
-
-#ifdef LOSCFG_KERNEL_VM
-    LDR     R0, [SP, #(19 * 4)]
-    AND     R0, R0, #CPSR_MASK_MODE                          @ Interrupted mode
-    CMP     R0, #CPSR_USER_MODE                              @ User mode
-    BNE     _osKernelExceptPrefetchAbortHdl
-
-    MOV    R1, SP
-    PUSH_FPU_REGS R0
-
-    MOV    R0, #OS_EXCEPT_PREFETCH_ABORT
-    BLX    OsArmSharedPageFault
-    CMP    R0, #0
-
-    POP_FPU_REGS R0
-    BEQ   _osExcPageFaultReturn
-#endif
+    AND     R4, R1, #CPSR_MASK_MODE                          @ Interrupted mode
+    CMP     R4, #CPSR_USER_MODE                              @ User mode
+    BEQ     _osExcPageFault                                   @ Branch if user mode

 _osKernelExceptPrefetchAbortHdl:
-    MOV    R0, #OS_EXCEPT_PREFETCH_ABORT
+    MOV     LR, R5
    B       _osExceptDispatch                                @ Branch to global exception handler.
 #endif

@@ -295,97 +266,118 @@ _osExceptDataAbortHdl:
 #endif
 #else
    SUB     LR, LR, #8                                       @ LR offset to return from this exception: -8.
+    STMFD   SP, {R0-R7}                                      @ Push working registers, but don`t change SP.
+    MOV     R5, LR
+    MRS     R1, SPSR

-    SRSFD   #CPSR_SVC_MODE!                                  @ Save pc and cpsr to svc sp, ARMv6 and above support
-    MSR     CPSR_c, #(CPSR_INT_DISABLE | CPSR_SVC_MODE)      @ Switch to svc mode, and disable all interrupt
-    STMFD   SP!, {R0-R3, R12, LR}
-    STMFD   SP, {R13, R14}^
-    SUB     SP, SP, #(2 * 4)
+    MOV     R0, #OS_EXCEPT_DATA_ABORT                        @ Set exception ID to OS_EXCEPT_DATA_ABORT.

-    MRC     P15, 0, R2, C6, C0, 0
-    MRC     P15, 0, R3, C5, C0, 0
-    STMFD   SP!, {R2-R3}                                     @ Save far and fsr
-    STMFD   SP!, {R4-R11}
-
-#ifdef LOSCFG_KERNEL_VM
-    MOV    R1, SP
-    PUSH_FPU_REGS R0
-
-    MOV    R0, #OS_EXCEPT_DATA_ABORT                        @ Set exception ID to OS_EXCEPT_DATA_ABORT.
-    BLX    OsArmSharedPageFault
-    CMP    R0, #0
-    POP_FPU_REGS R0
-    BEQ   _osExcPageFaultReturn
-#endif
-
-    MOV   R0, #OS_EXCEPT_DATA_ABORT
-    B     _osExceptDispatch
-#endif
-
-#ifdef LOSCFG_KERNEL_VM
-_osExcPageFaultReturn:
-    LDMFD  SP!, {R4-R11}
-    ADD    SP, SP, #(2 * 4)
-    LDMFD  SP, {R13, R14}^
-    ADD    SP, SP, #(2 * 4)                                  @ Jump reserved fileds
-    LDMFD  SP!, {R0-R3, R12, LR}
-    RFEIA  SP!
+    B     _osExcPageFault
 #endif

@ Description: Address abort exception handler
 _osExceptAddrAbortHdl:
    SUB     LR, LR, #8                                       @ LR offset to return from this exception: -8.
-
-    SRSFD   #CPSR_SVC_MODE!                                  @ Save pc and cpsr to svc sp, ARMv6 and above support
-    MSR     CPSR_c, #(CPSR_INT_DISABLE | CPSR_SVC_MODE)      @ Switch to svc mode, and disable all interrupt
-    STMFD   SP!, {R0-R3, R12, LR}
-    STMFD   SP, {R13, R14}^
-    SUB     SP, SP, #(2 * 4)
-
-    MOV     R2, #0
-    MOV     R3, #0
-    STMFD   SP!, {R2-R3}                                     @ far and fsr fields, are 0 under this anomaly
-    STMFD   SP!, {R4-R11}
+    STMFD   SP, {R0-R7}                                      @ Push working registers, but don`t change SP.

    MOV     R0, #OS_EXCEPT_ADDR_ABORT                        @ Set exception ID to OS_EXCEPT_ADDR_ABORT.
+
    B       _osExceptDispatch                                @ Branch to global exception handler.

@ Description: Fast interrupt request exception handler
 _osExceptFiqHdl:
    SUB     LR, LR, #4                                       @ LR offset to return from this exception: -4.
+    STMFD   SP, {R0-R7}                                      @ Push working registers.

-    SRSFD   #CPSR_SVC_MODE!                                  @ Save pc and cpsr to svc sp, ARMv6 and above support
-    MSR     CPSR_c, #(CPSR_INT_DISABLE | CPSR_SVC_MODE)      @ Switch to svc mode, and disable all interrupt
-    STMFD   SP!, {R0-R3, R12, LR}
-    STMFD   SP, {R13, R14}^
-    SUB     SP, SP, #(2 * 4)
+    MOV     R0, #OS_EXCEPT_FIQ                               @ Set exception ID to OS_EXCEPT_FIQ.

-    MOV     R2, #0
-    MOV     R3, #0
-    STMFD   SP!, {R2-R3}                                     @ far and fsr fields, are 0 under this anomaly
+    B       _osExceptDispatch                                @ Branch to global exception handler.
+
+_osExcPageFault:
+    SUB     R3, SP, #(8 * 4)                                 @ Save the start address of working registers.
+    MSR     CPSR_c, #(CPSR_INT_DISABLE | CPSR_SVC_MODE)      @ Switch to SVC mode, and disable all interrupts
+    MOV     R2, SP
+    STMFD   SP!, {R5}                                        @ Push original PC
+    STMFD   SP!, {LR}                                        @ Push original svc LR
+    STMFD   SP!, {R2}                                        @ Push original svc SP
+    STMFD   SP!, {R8-R12}                                    @ Push original R12-R8,
+    LDMFD   R3!, {R4-R11}                                    @ Move original R7-R0 from exception stack to original stack.
    STMFD   SP!, {R4-R11}
+    STMFD   SP!, {R1}
+    SUB     SP, SP, #8
+    STMIA   SP, {R13, R14}^                                  @ Save user mode r13(sp) and r14(lr)
+
+    MOV     R4, SP
+    BIC     SP, SP, #7
+    PUSH_FPU_REGS R1
+
+    CMP     R0, #OS_EXCEPT_DATA_ABORT
+    BNE     1f
+    MRC     P15, 0, R2, C6, C0, 0
+    MRC     P15, 0, R3, C5, C0, 0
+    B       2f
+1:  MRC     P15, 0, R2, C6, C0, 2
+    MRC     P15, 0, R3, C5, C0, 1
+
+2:  MOV     R1, R4
+    MOV     R5, R0
+    MOV     R8, R2
+    MOV     R9, R3
+    CPSIE   I
+    BLX     OsArmSharedPageFault
+    CPSID   I
+
+    POP_FPU_REGS R1
+    MOV     SP, R4
+    CMP     R0, #0
+    BEQ     _OsExcReturn
+
+    MOV     R0, R5                                           @ exc type
+    B       _osExceptionSwi

@ Description: Exception handler
@ Parameter  : R0     Exception Type
@ Regs Hold  : R3     Exception`s CPSR
 _osExceptDispatch:
-    LDR     R8, [SP, #(8 * 4)]                               @ Get far
-    LDR     R9, [SP, #(9 * 4)]                               @ Get fsr
-
-    ADD     R2, SP, #(20 * 4)                                @ sp + sizeof(ExcContext), position of SVC stack before exception
-    STR     R2, [SP, #(8 * 4)]                               @ Save svc sp
-
-    MOV     R1, SP
-
-#ifdef LOSCFG_KERNEL_VM
-    LDR     R2, [SP, #(19 * 4)]                              @ Get CPSR
-    AND     R2, R2, #CPSR_MASK_MODE                          @ Interrupted mode
-    CMP     R2, #CPSR_USER_MODE                              @ User mode
-    BEQ     _osExceptionGetSP
-#endif
+    MRS     R2, SPSR                                         @ Save CPSR before exception.
+    MOV     R1, LR                                           @ Save PC before exception.
+    SUB     R3, SP, #(8 * 4)                                 @ Save the start address of working registers.

+    MSR     CPSR_c, #(CPSR_INT_DISABLE | CPSR_SVC_MODE)      @ Switch to SVC mode, and disable all interrupts
+    MOV     R5, SP
    EXC_SP_SET __exc_stack_top, OS_EXC_STACK_SIZE, R6, R7

+    STMFD   SP!, {R1}                                        @ Push Exception PC
+    STMFD   SP!, {LR}                                        @ Push SVC LR
+    STMFD   SP!, {R5}                                        @ Push SVC SP
+    STMFD   SP!, {R8-R12}                                    @ Push original R12-R8,
+    LDMFD   R3!, {R4-R11}                                    @ Move original R7-R0 from exception stack to original stack.
+    STMFD   SP!, {R4-R11}
+    STMFD   SP!, {R2}                                        @ Push task`s CPSR (i.e. exception SPSR).
+
+    CMP     R0, #OS_EXCEPT_DATA_ABORT
+    BNE     1f
+    MRC     P15, 0, R8, C6, C0, 0
+    MRC     P15, 0, R9, C5, C0, 0
+    B       3f
+1:  CMP     R0, #OS_EXCEPT_PREFETCH_ABORT
+    BNE     2f
+    MRC     P15, 0, R8, C6, C0, 2
+    MRC     P15, 0, R9, C5, C0, 1
+    B       3f
+2:  MOV     R8, #0
+    MOV     R9, #0
+
+3:  AND     R2, R2, #CPSR_MASK_MODE
+    CMP     R2, #CPSR_USER_MODE                              @ User mode
+    BNE     4f
+    STMFD   SP, {R13, R14}^                                  @ save user mode sp and lr
+4:
+    SUB     SP, SP, #(4 * 2)
+
+_osExceptionSwi:
+    MOV     R1, SP                                            @ The second argument to the exception
+
    MRC     P15, 0, R4, C0, C0, 5
    AND     R4, R4, #MPIDR_CPUID_MASK                         @ Get Current cpu id
    LSL     R2, R4, #2
@@ -413,4 +405,19 @@ _osExceptionGetSP:
    LDR     R5, =OsExcHandleEntry                             @ OsExcHandleEntry(UINT32 excType, ExcContext * excBufAddr)
    BX      R5

+_OsExcReturn:
+    LDR     R0, [SP, #(2 * 4)]
+    AND     R0, R0,  #CPSR_MASK_MODE
+    CMP     R0, #CPSR_USER_MODE                               @ User mode
+    BNE     _OsExcReturnToKernel
+    LDMFD   SP, {R13, R14}^                                   @ load user mode sp and lr
+
+_OsExcReturnToKernel:
+    ADD     SP, SP, #(2 * 4)
+    LDMFD   SP!, {R1}
+    MSR     SPSR_cxsf, R1                                     @ Set the return mode SPSR
+    LDMFD   SP!, {R0-R12}
+    ADD     SP, SP, #4
+    LDMFD   SP!, {LR, PC}^
+
    .end
--- a/arch/arm/arm/src/los_hw_tick.c
+++ b/arch/arm/arm/src/los_hw_tick.c
@@ -32,6 +32,11 @@
 #include "los_sys_pri.h"
 #include "los_hwi.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 LITE_OS_SEC_TEXT_INIT UINT32 OsTickInit(UINT32 systemClock, UINT32 tickPerSecond)
 {
@@ -60,8 +65,10 @@ LITE_OS_SEC_TEXT_MINOR VOID LOS_GetCpuCycle(UINT32 *highCnt, UINT32 *lowCnt)

 LITE_OS_SEC_TEXT_MINOR UINT64 LOS_CurrNanosec(VOID)
 {
-    UINT64 cycle = HalClockGetCycles();
-    return (cycle / g_sysClock) * OS_SYS_NS_PER_SECOND + (cycle % g_sysClock) * OS_SYS_NS_PER_SECOND / g_sysClock;
+    DOUBLE nanos;
+
+    nanos = (DOUBLE)HalClockGetCycles() * OS_SYS_NS_PER_SECOND / g_sysClock;
+    return (UINT64)nanos;
 }

 LITE_OS_SEC_TEXT_MINOR VOID LOS_Udelay(UINT32 usecs)
@@ -74,3 +81,8 @@ LITE_OS_SEC_TEXT_MINOR VOID LOS_Mdelay(UINT32 msecs)
    HalDelayUs(msecs * 1000); /* 1000 : 1ms = 1000us */
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/arch/arm/arm/src/los_hwi.c
+++ b/arch/arm/arm/src/los_hwi.c
@@ -37,6 +37,11 @@
 #endif
 #include "los_sched_pri.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 /* spinlock for hwi module, only available on SMP mode */
 LITE_OS_SEC_BSS  SPIN_LOCK_INIT(g_hwiSpin);
@@ -347,3 +352,8 @@ LITE_OS_SEC_TEXT_INIT UINT32 LOS_HwiDelete(HWI_HANDLE_T hwiNum, HwiIrqParam *irq
    return ret;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/arch/arm/arm/src/startup/reset_vector_mp.S
+++ b/arch/arm/arm/src/startup/reset_vector_mp.S
@@ -37,9 +37,17 @@


    .global __exc_stack_top
+    .global __irq_stack_top
+    .global __fiq_stack_top
    .global __svc_stack_top
+    .global __abt_stack_top
+    .global __undef_stack_top
    .global __exc_stack
+    .global __irq_stack
+    .global __fiq_stack
    .global __svc_stack
+    .global __abt_stack
+    .global __undef_stack

    .extern __bss_start
    .extern __bss_end
@@ -107,9 +115,9 @@ __exception_handlers:
    .global reset_vector
    .type   reset_vector,function

-#ifdef LOSCFG_BOOTENV_RAM
+#ifdef LOSCFG_QUICK_START
 __quickstart_args_start:
-    .fill LOSCFG_BOOTENV_RAMSIZE,1,0
+    .fill 512,1,0
 __quickstart_args_end:

 .global OsGetArgsAddr
@@ -176,7 +184,6 @@ reloc_img_to_bottom_loop:
    sub     r11, r11, r12                       /* r11: eventual address offset */

 reloc_img_to_bottom_done:
-#ifdef LOSCFG_KERNEL_MMU
    ldr     r4, =g_firstPageTable               /* r4: physical address of translation table and clear it */
    add     r4, r4, r11
    mov     r0, r4
@@ -205,20 +212,41 @@ reloc_img_to_bottom_done:
    str     r12, [r4, r7, lsr #(20 - 2)]        /* jumpTable[paIndex] = pt entry */
    rsb     r7, r11, r6, lsl #20                /* r7: va */
    str     r12, [r4, r7, lsr #(20 - 2)]        /* jumpTable[vaIndex] = pt entry */
-#endif
+
    bl      _bootaddr_setup
-#ifdef LOSCFG_KERNEL_MMU
+
    bl      mmu_setup                           /* set up the mmu */
-#endif
+
    /* clear out the interrupt and exception stack and set magic num to check the overflow */
-    ldr     r0, =__svc_stack
+    ldr     r0, =__undef_stack
    ldr     r1, =__exc_stack_top
    bl      stack_init

+    STACK_MAGIC_SET __undef_stack, #OS_EXC_UNDEF_STACK_SIZE, OS_STACK_MAGIC_WORD
+    STACK_MAGIC_SET __abt_stack, #OS_EXC_ABT_STACK_SIZE, OS_STACK_MAGIC_WORD
+    STACK_MAGIC_SET __irq_stack, #OS_EXC_IRQ_STACK_SIZE, OS_STACK_MAGIC_WORD
+    STACK_MAGIC_SET __fiq_stack, #OS_EXC_FIQ_STACK_SIZE, OS_STACK_MAGIC_WORD
    STACK_MAGIC_SET __svc_stack, #OS_EXC_SVC_STACK_SIZE, OS_STACK_MAGIC_WORD
    STACK_MAGIC_SET __exc_stack, #OS_EXC_STACK_SIZE, OS_STACK_MAGIC_WORD

 warm_reset:
+    /* initialize interrupt/exception environments */
+    mov    r0, #(CPSR_IRQ_DISABLE |CPSR_FIQ_DISABLE|CPSR_IRQ_MODE)
+    msr    cpsr, r0
+    EXC_SP_SET __irq_stack_top, #OS_EXC_IRQ_STACK_SIZE
+
+    mov    r0, #(CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_UNDEF_MODE)
+    msr    cpsr, r0
+    EXC_SP_SET __undef_stack_top, #OS_EXC_UNDEF_STACK_SIZE
+
+    mov    r0, #(CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_ABT_MODE)
+    msr    cpsr, r0
+    EXC_SP_SET __abt_stack_top, #OS_EXC_ABT_STACK_SIZE
+
+    mov    r0, #(CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_FIQ_MODE)
+    msr    cpsr, r0
+    EXC_SP_SET __fiq_stack_top, #OS_EXC_FIQ_STACK_SIZE
+
    /* initialize CPSR (machine state register) */
    mov    r0, #(CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_SVC_MODE)
    msr    cpsr, r0
@@ -266,7 +294,7 @@ clear_bss:

 _start_hang:
    b      _start_hang
-#ifdef LOSCFG_KERNEL_MMU
+
 mmu_setup:
    mov     r12, #0
    mcr     p15, 0, r12, c8, c7, 0              /* Set c8 to control the TLB and set the mapping to invalid */
@@ -302,7 +330,7 @@ mmu_setup:
    isb
    sub     lr,  r11                            /* adjust lr with delta of physical address and virtual address */
    bx      lr
-#endif
+
    .code  32

    .global reset_platform
@@ -318,7 +346,6 @@ reset_platform:
    mov    pc, r0   // Jump to reset vector
 #endif
 cpu_start:
-#ifdef LOSCFG_KERNEL_MMU
    ldr     r4, =g_firstPageTable               /* r4 = physical address of translation table and clear it */
    add     r4, r4, r11
    orr     r8, r4, #MMU_TTBRx_FLAGS
@@ -329,7 +356,6 @@ cpu_start:
    add     r4, r4, r11                         /* r4 = tt_trampoline paddr */

    bl     mmu_setup
-#endif
    bl     secondary_cpu_start
    b      .

@@ -368,7 +394,6 @@ sp_set:
 * r10: flags
 * r9 and r12 will be used as variable
 */
-#ifdef LOSCFG_KERNEL_MMU
 page_table_build:
    mov     r9, r6
    bfc     r9, #20, #12                        /* r9: pa % MB */
@@ -387,7 +412,7 @@ page_table_build_loop:
    subs    r8, #1                              /* sizes-- */
    bne     page_table_build_loop
    bx      lr
-#endif
+
 /*
 * init stack to initial value
 * r0 is stack mem start, r1 is stack mem end
@@ -440,7 +465,6 @@ _bootaddr_setup:

    bx      lr

-#ifdef LOSCFG_KERNEL_MMU
 memset_optimized:
    mov     r3, r0
    vdup.8  q0, r1
@@ -452,7 +476,7 @@ memset_optimized_loop:
    vstmia  r3!, {d0 - d7}
    bge     memset_optimized_loop
    bx      lr
-#endif
+
 init_done:
    .long  0xDEADB00B

@@ -469,6 +493,22 @@ init_flag:
    .section ".int_stack", "wa", %nobits
    .align  3

+__undef_stack:
+    .space OS_EXC_UNDEF_STACK_SIZE * CORE_NUM
+__undef_stack_top:
+
+__abt_stack:
+    .space OS_EXC_ABT_STACK_SIZE * CORE_NUM
+__abt_stack_top:
+
+__irq_stack:
+    .space OS_EXC_IRQ_STACK_SIZE * CORE_NUM
+__irq_stack_top:
+
+__fiq_stack:
+    .space OS_EXC_FIQ_STACK_SIZE * CORE_NUM
+__fiq_stack_top:
+
 __svc_stack:
    .space OS_EXC_SVC_STACK_SIZE * CORE_NUM
 __svc_stack_top:
--- a/arch/arm/arm/src/startup/reset_vector_up.S
+++ b/arch/arm/arm/src/startup/reset_vector_up.S
@@ -38,9 +38,17 @@


    .global __exc_stack_top
+    .global __irq_stack_top
+    .global __fiq_stack_top
    .global __svc_stack_top
+    .global __abt_stack_top
+    .global __undef_stack_top
    .global __exc_stack
+    .global __irq_stack
+    .global __fiq_stack
    .global __svc_stack
+    .global __abt_stack
+    .global __undef_stack

    .extern __bss_start
    .extern __bss_end
@@ -153,7 +161,6 @@ reloc_img_to_bottom_loop:
    sub     r11, r11, r12                       /* r11: eventual address offset */

 reloc_img_to_bottom_done:
-#ifdef LOSCFG_KERNEL_MMU
    ldr     r4, =g_firstPageTable               /* r4: physical address of translation table and clear it */
    add     r4, r4, r11
    mov     r0, r4
@@ -161,6 +168,7 @@ reloc_img_to_bottom_done:
    mov     r2, #MMU_DESCRIPTOR_L1_SMALL_ENTRY_NUMBERS
    bl      memset_optimized                    /* optimized memset since r0 is 64-byte aligned */

+
    PAGE_TABLE_SET SYS_MEM_BASE, KERNEL_VMM_BASE, KERNEL_VMM_SIZE, MMU_DESCRIPTOR_KERNEL_L1_PTE_FLAGS
    PAGE_TABLE_SET SYS_MEM_BASE, UNCACHED_VMM_BASE, UNCACHED_VMM_SIZE, MMU_INITIAL_MAP_NORMAL_NOCACHE
    PAGE_TABLE_SET PERIPH_PMM_BASE, PERIPH_DEVICE_BASE, PERIPH_DEVICE_SIZE, MMU_INITIAL_MAP_DEVICE
@@ -184,7 +192,7 @@ reloc_img_to_bottom_done:
    str     r12, [r4, r7, lsr #(20 - 2)]        /* jumpTable[vaIndex] = pt entry */

    bl      mmu_setup                           /* set up the mmu */
-#endif
+
    /* get cpuid and keep it in r11 */
    mrc     p15, 0, r11, c0, c0, 5
    and     r11, r11, #MPIDR_CPUID_MASK
@@ -193,15 +201,36 @@ reloc_img_to_bottom_done:

 excstatck_loop:
    /* clear out the interrupt and exception stack and set magic num to check the overflow */
-    ldr     r0, =__svc_stack
+    ldr     r0, =__undef_stack
    ldr     r1, =__exc_stack_top
    bl      stack_init

+    STACK_MAGIC_SET __undef_stack, #OS_EXC_UNDEF_STACK_SIZE, OS_STACK_MAGIC_WORD
+    STACK_MAGIC_SET __abt_stack, #OS_EXC_ABT_STACK_SIZE, OS_STACK_MAGIC_WORD
+    STACK_MAGIC_SET __irq_stack, #OS_EXC_IRQ_STACK_SIZE, OS_STACK_MAGIC_WORD
+    STACK_MAGIC_SET __fiq_stack, #OS_EXC_FIQ_STACK_SIZE, OS_STACK_MAGIC_WORD
    STACK_MAGIC_SET __svc_stack, #OS_EXC_SVC_STACK_SIZE, OS_STACK_MAGIC_WORD
    STACK_MAGIC_SET __exc_stack, #OS_EXC_STACK_SIZE, OS_STACK_MAGIC_WORD

 excstatck_loop_done:
 warm_reset:
+    /* initialize interrupt/exception environments */
+    mov    r0, #(CPSR_IRQ_DISABLE |CPSR_FIQ_DISABLE|CPSR_IRQ_MODE)
+    msr    cpsr, r0
+    EXC_SP_SET __irq_stack_top, #OS_EXC_IRQ_STACK_SIZE
+
+    mov    r0, #(CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_UNDEF_MODE)
+    msr    cpsr, r0
+    EXC_SP_SET __undef_stack_top, #OS_EXC_UNDEF_STACK_SIZE
+
+    mov    r0, #(CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_ABT_MODE)
+    msr    cpsr, r0
+    EXC_SP_SET __abt_stack_top, #OS_EXC_ABT_STACK_SIZE
+
+    mov    r0, #(CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_FIQ_MODE)
+    msr    cpsr, r0
+    EXC_SP_SET __fiq_stack_top, #OS_EXC_FIQ_STACK_SIZE
+
    /* initialize CPSR (machine state register) */
    mov    r0, #(CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_SVC_MODE)
    msr    cpsr, r0
@@ -258,7 +287,6 @@ clear_bss:
 _start_hang:
    b      _start_hang

-#ifdef LOSCFG_KERNEL_MMU
 mmu_setup:
    mov     r12, #0
    mcr     p15, 0, r12, c8, c7, 0              /* Set c8 to control the TLB and set the mapping to invalid */
@@ -295,7 +323,7 @@ mmu_setup:

    sub     lr,  r11                            /* adjust lr with delta of physical address and virtual address */
    bx      lr
-#endif
+
    .code  32

    .global reset_platform
@@ -334,7 +362,6 @@ sp_set:
 * r10: flags
 * r9 and r12 will be used as variable
 */
-#ifdef LOSCFG_KERNEL_MMU
 page_table_build:
    mov     r9, r6
    bfc     r9, #20, #12                        /* r9: pa % MB */
@@ -353,7 +380,7 @@ page_table_build_loop:
    subs    r8, #1                              /* sizes-- */
    bne     page_table_build_loop
    bx      lr
-#endif
+
 /*
 * init stack to initial value
 * r0 is stack mem start, r1 is stack mem end
@@ -406,7 +433,6 @@ _bootaddr_setup:

    bx      lr

-#ifdef LOSCFG_KERNEL_MMU
 memset_optimized:
    mov     r3, r0
    vdup.8  q0, r1
@@ -418,7 +444,7 @@ memset_optimized_loop:
    vstmia  r3!, {d0 - d7}
    bge     memset_optimized_loop
    bx      lr
-#endif
+
 init_done:
    .long  0xDEADB00B

@@ -435,6 +461,22 @@ init_flag:
    .section ".int_stack", "wa", %nobits
    .align  3

+__undef_stack:
+    .space OS_EXC_UNDEF_STACK_SIZE * CORE_NUM
+__undef_stack_top:
+
+__abt_stack:
+    .space OS_EXC_ABT_STACK_SIZE * CORE_NUM
+__abt_stack_top:
+
+__irq_stack:
+    .space OS_EXC_IRQ_STACK_SIZE * CORE_NUM
+__irq_stack_top:
+
+__fiq_stack:
+    .space OS_EXC_FIQ_STACK_SIZE * CORE_NUM
+__fiq_stack_top:
+
 __svc_stack:
    .space OS_EXC_SVC_STACK_SIZE * CORE_NUM
 __svc_stack_top:
--- a/arch/arm/arm/src/strncpy_from_user.c
+++ b/arch/arm/arm/src/strncpy_from_user.c
@@ -33,6 +33,11 @@
 #include "los_user_get.h"
 #include "los_vm_map.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 INT32 LOS_StrncpyFromUser(CHAR *dst, const CHAR *src, INT32 count)
 {
@@ -62,3 +67,8 @@ INT32 LOS_StrncpyFromUser(CHAR *dst, const CHAR *src, INT32 count)
    return offset;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/arch/arm/arm/src/strnlen_user.c
+++ b/arch/arm/arm/src/strnlen_user.c
@@ -33,6 +33,11 @@
 #include "los_user_get.h"
 #include "los_vm_map.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 INT32 LOS_StrnlenUser(const CHAR *src, INT32 count)
 {
@@ -61,3 +66,8 @@ INT32 LOS_StrnlenUser(const CHAR *src, INT32 count)
    return count + 1;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/arch/arm/arm/src/user_copy.c
+++ b/arch/arm/arm/src/user_copy.c
@@ -35,6 +35,11 @@
 #include "los_memory.h"
 #include "los_vm_map.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 size_t arch_copy_from_user(void *dst, const void *src, size_t len)
 {
@@ -109,4 +114,9 @@ INT32 LOS_UserMemClear(unsigned char *buf, UINT32 len)
    return ret;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */

--- a/arch/arm/gic/Makefile
+++ b/arch/arm/gic/Makefile
@@ -1,48 +0,0 @@
-# Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
-# Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without modification,
-# are permitted provided that the following conditions are met:
-#
-# 1. Redistributions of source code must retain the above copyright notice, this list of
-#    conditions and the following disclaimer.
-#
-# 2. Redistributions in binary form must reproduce the above copyright notice, this list
-#    of conditions and the following disclaimer in the documentation and/or other materials
-#    provided with the distribution.
-#
-# 3. Neither the name of the copyright holder nor the names of its contributors may be used
-#    to endorse or promote products derived from this software without specific prior written
-#    permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
-# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
-# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
-# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
-# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-include $(LITEOSTOPDIR)/config.mk
-
-MODULE_NAME := $(notdir $(shell pwd))
-
-# LOCAL_SRCS := $(wildcard *.c)
-
-ifeq ($(LOSCFG_ARCH_GIC_V2), y)
-LOCAL_SRCS := gic_v2.c
-else ifeq ($(LOSCFG_ARCH_GIC_V3), y)
-LOCAL_SRCS := gic_v3.c
-endif
-
-LOCAL_INCLUDE := \
-	-I $(LITEOSTOPDIR)/kernel/base/include \
-	-I $(LITEOSTOPDIR)/arch/arm/include \
-	-I $(LITEOSTOPDIR)/arch/arm/arm/src/include \
-
-LOCAL_FLAGS := $(LOCAL_INCLUDE)
-include $(MODULE)
--- a/arch/arm/include/in_cksum.h
+++ b/arch/arm/include/in_cksum.h
--- a/arch/arm/include/los_exc.h
+++ b/arch/arm/include/los_exc.h
@@ -63,29 +63,26 @@ typedef struct {
    UINT64 SPSR;
 } ExcContext;
 #else
-/* It has the same structure as TaskContext */
 typedef struct {
-    UINT32 R4;
-    UINT32 R5;
-    UINT32 R6;
-    UINT32 R7;
-    UINT32 R8;
-    UINT32 R9;
-    UINT32 R10;
-    UINT32 R11;
-
-    UINT32 SP;       /**< svc sp */
-    UINT32 reserved; /**< Reserved, multiplexing register */
-    UINT32 USP;
-    UINT32 ULR;
+    UINT32 USP;     /**< User mode stack pointer */
+    UINT32 ULR;     /**< User mode program returning address */
+    UINT32 regCPSR; /**< Current program status register (CPSR) */
    UINT32 R0;      /**< Register R0 */
    UINT32 R1;      /**< Register R1 */
    UINT32 R2;      /**< Register R2 */
    UINT32 R3;      /**< Register R3 */
+    UINT32 R4;      /**< Register R4 */
+    UINT32 R5;      /**< Register R5 */
+    UINT32 R6;      /**< Register R6 */
+    UINT32 R7;      /**< Register R7 */
+    UINT32 R8;      /**< Register R8 */
+    UINT32 R9;      /**< Register R9 */
+    UINT32 R10;     /**< Register R10 */
+    UINT32 R11;     /**< Register R11 */
    UINT32 R12;     /**< Register R12 */
+    UINT32 SP;      /**< Stack pointer */
    UINT32 LR;      /**< Program returning address. */
    UINT32 PC;      /**< PC pointer of the exceptional function */
-    UINT32 regCPSR;
 } ExcContext;
 #endif

@@ -186,7 +183,7 @@ extern UINT32 LOS_ExcRegHook(EXC_PROC_FUNC excHook);
 * los_exc.h: the header file that contains the API declaration.
 * @see None.
 */
-NORETURN VOID LOS_Panic(const CHAR *fmt, ...);
+VOID LOS_Panic(const CHAR *fmt, ...);

 /**
 * @ingroup los_exc
--- a/arch/arm/include/los_hw.h
+++ b/arch/arm/include/los_hw.h
@@ -77,6 +77,134 @@ extern UINT64 g_cpuMap[];
 #define CPU_MAP_GET(cpuid)          g_cpuMap[(cpuid)]
 #define CPU_MAP_SET(cpuid, hwid)    g_cpuMap[(cpuid)] = (hwid)

+/**
+ * @ingroup los_hw
+ * @brief Set Event.
+ *
+ * @par Description:
+ * <ul>
+ * <li>This API is used to send an event to all cores within a muti-processor system.</li>
+ * </ul>
+ * @attention
+ * <ul>
+ * <li>This API is not implemented.</li>
+ * </ul>
+ *
+ * @param None.
+ *
+ * @retval #None.
+ *
+ * @par Dependency:
+ * los_hw.h: the header file that contains the API declaration.
+ * @see wfe.
+ */
+extern VOID Sev(VOID);
+
+/**
+ * @ingroup los_hw
+ * @brief Wait for event.
+ *
+ * @par Description:
+ * <ul>
+ * <li>This API is used to suspend execution until events occurs if the event register is not set.</li>
+ * </ul>
+ * @attention
+ * <ul>
+ * <li>This API is not implemented.</li>
+ * </ul>
+ *
+ * @param None.
+ *
+ * @retval #None.
+ *
+ * @par Dependency:
+ * los_hw.h: the header file that contains the API declaration.
+ * @see sev.
+ */
+extern VOID Wfe(VOID);
+
+/**
+ * @ingroup los_hw
+ * @brief Wait for interrupt.
+ *
+ * @par Description:
+ * <ul>
+ * <li>This API is used to suspend execution until interrupt or a debug request occurs.</li>
+ * </ul>
+ * @attention None.
+ *
+ * @param None.
+ *
+ * @retval #None.
+ *
+ * @par Dependency:
+ * los_hw.h: the header file that contains the API declaration.
+ * @see None.
+ */
+extern VOID Wfi(VOID);
+
+/**
+ * @ingroup los_hw
+ * @brief Data Memory Barrier.
+ *
+ * @par Description:
+ * <ul>
+ * <li>This API is used as a memory barrier</li>
+ * </ul>
+ * @attention None.
+ *
+ * @param None.
+ *
+ * @retval #None.
+ *
+ * @par Dependency:
+ * los_hw.h: the header file that contains the API declaration.
+ * @see None.
+ */
+extern VOID Dmb(VOID);
+
+/**
+ * @ingroup los_hw
+ * @brief Data Synchronization Barrier.
+ *
+ * @par Description:
+ * <ul>
+ * <li>This API is used as a special kind of memory barrier</li>
+ * </ul>
+ * @attention None.
+ *
+ * @param None.
+ *
+ * @retval #None.
+ *
+ * @par Dependency:
+ * los_hw.h: the header file that contains the API declaration.
+ * @see None.
+ */
+extern VOID Dsb(VOID);
+
+/**
+ * @ingroup los_hw
+ * @brief Instruction Synchronization Barrier.
+ *
+ * @par Description:
+ * <ul>
+ * <li>This API is used to flush the pipeline in the processor,
+ * so that all instructions following the ISB are fetched from cache or memory,
+ * after the instruction has been completed.</li>
+ * </ul>
+ * @attention None.
+ *
+ * @param None.
+ *
+ * @retval #None.
+ *
+ * @par Dependency:
+ * los_hw.h: the header file that contains the API declaration.
+ * @see None.
+ */
+extern VOID Isb(VOID);
+
 /**
 * @ingroup los_hw
 * @brief Invalidate instruction cache.
--- a/arch/arm/include/los_hwi.h
+++ b/arch/arm/include/los_hwi.h
--- a/arch/arm/include/los_strncpy_from_user.h
+++ b/arch/arm/include/los_strncpy_from_user.h
--- a/arch/arm/include/los_strnlen_user.h
+++ b/arch/arm/include/los_strnlen_user.h
--- a/arch/arm/include/los_sys_stack_pri.h
+++ b/arch/arm/include/los_sys_stack_pri.h
@@ -44,11 +44,19 @@ extern "C" {
 extern UINTPTR __stack_startup;
 extern UINTPTR __stack_startup_top;
 #else
+extern UINTPTR __fiq_stack_top;
 extern UINTPTR __svc_stack_top;
+extern UINTPTR __abt_stack_top;
+extern UINTPTR __undef_stack_top;
 extern UINTPTR __exc_stack_top;
+extern UINTPTR __fiq_stack;
 extern UINTPTR __svc_stack;
+extern UINTPTR __abt_stack;
+extern UINTPTR __undef_stack;
 extern UINTPTR __exc_stack;
 #endif
+extern UINTPTR __irq_stack_top;
+extern UINTPTR __irq_stack;

 #ifdef __cplusplus
 #if __cplusplus
--- a/arch/arm/include/los_user_get.h
+++ b/arch/arm/include/los_user_get.h
--- a/arch/arm/include/los_user_put.h
+++ b/arch/arm/include/los_user_put.h
--- a/arch/arm/include/user_copy.h
+++ b/arch/arm/include/user_copy.h
--- a/bsd/Kconfig
+++ b/bsd/Kconfig
--- a/bsd/compat/linuxkpi/Makefile
+++ b/bsd/compat/linuxkpi/Makefile
--- a/bsd/dev/usb/Kconfig
+++ b/bsd/dev/usb/Kconfig
--- a/bsd/dev/usb/Makefile
+++ b/bsd/dev/usb/Makefile
--- a/build.sh
+++ b/build.sh
@@ -38,22 +38,22 @@ outdir="../..$3/test_info/gen/kernel/test"
 if [ "$5" = "tee" ]; then
    tee="_tee"
 fi
-productName="$(basename $7)"
-source="tools/build/config/${productName}_release.config"
+product_name="$(basename $7)"
+source="tools/build/config/${product_name}_release.config"
 if [ "$2" = "clang" ]; then
    if [ "$4" = "debug" ]; then
-        config_file="${productName}_$2$tee.config"
+        config_file="${product_name}_$2$tee.config"
        source="tools/build/config/debug/$config_file"
    else
-        config_file="${productName}_$2_release$tee.config"
+        config_file="${product_name}_$2_release$tee.config"
        source="tools/build/config/$config_file"
    fi
 elif [ "$2" = "gcc" ]; then
    if [ "$4" = "debug" ]; then
-        config_file="${productName}_debug_shell$tee.config"
+        config_file="${product_name}_debug_shell$tee.config"
        source="tools/build/config/$config_file"
    else
-        config_file="${productName}_release$tee.config"
+        config_file="${product_name}_release$tee.config"
        source="tools/build/config/$config_file"
    fi
 fi
--- a/compat/posix/Kconfig
+++ b/compat/posix/Kconfig
--- a/compat/posix/include/mqueue.h
+++ b/compat/posix/include/mqueue.h
--- a/compat/posix/include/time_posix.h
+++ b/compat/posix/include/time_posix.h
--- a/compat/posix/src/map_error.c
+++ b/compat/posix/src/map_error.c
@@ -34,6 +34,11 @@
 #include "los_sem.h"
 #include "los_task.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 int map_errno(UINT32 err)
 {
@@ -110,3 +115,8 @@ int map_errno(UINT32 err)
    return errno;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/misc.c
+++ b/compat/posix/src/misc.c
@@ -37,6 +37,11 @@
 #include "mqueue.h"
 #include "semaphore.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 /*
 * Supply some suitable values for constants that may not be present
@@ -140,3 +145,8 @@ pid_t getpid(void)
    return ((LosTaskCB *)(OsCurrTaskGet()))->taskID;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/mqueue.c
+++ b/compat/posix/src/mqueue.c
@@ -40,6 +40,11 @@
 #include "fs_file.h"
 #include "user_copy.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 #define FNONBLOCK   O_NONBLOCK

@@ -739,8 +744,11 @@ int mq_timedsend(mqd_t personal, const char *msg, size_t msgLen, unsigned int ms

    (VOID)pthread_mutex_lock(&g_mqueueMutex);
    privateMqPersonal = MqGetPrivDataBuff(personal);
+    if (privateMqPersonal == NULL) {
+        goto ERROUT_UNLOCK;
+    }

-    OS_MQ_GOTO_ERROUT_UNLOCK_IF(privateMqPersonal == NULL || privateMqPersonal->mq_status != MQ_USE_MAGIC, EBADF);
+    OS_MQ_GOTO_ERROUT_UNLOCK_IF(privateMqPersonal->mq_status != MQ_USE_MAGIC, EBADF);

    mqueueCB = privateMqPersonal->mq_posixdes;
    OS_MQ_GOTO_ERROUT_UNLOCK_IF(msgLen > (size_t)(mqueueCB->mqcb->queueSize - sizeof(UINT32)), EMSGSIZE);
@@ -783,7 +791,10 @@ ssize_t mq_timedreceive(mqd_t personal, char *msg, size_t msgLen, unsigned int *

    (VOID)pthread_mutex_lock(&g_mqueueMutex);
    privateMqPersonal = MqGetPrivDataBuff(personal);
-    if (privateMqPersonal == NULL || privateMqPersonal->mq_status != MQ_USE_MAGIC) {
+    if (privateMqPersonal == NULL) {
+        goto ERROUT_UNLOCK;
+    }
+    if (privateMqPersonal->mq_status != MQ_USE_MAGIC) {
        errno = EBADF;
        goto ERROUT_UNLOCK;
    }
@@ -831,3 +842,8 @@ ssize_t mq_receive(mqd_t personal, char *msg_ptr, size_t msg_len, unsigned int *
    return mq_timedreceive(personal, msg_ptr, msg_len, msg_prio, NULL);
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/posix_memalign.c
+++ b/compat/posix/src/posix_memalign.c
@@ -32,6 +32,11 @@
 #include "los_typedef.h"
 #include "los_memory.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 int posix_memalign(void **memAddr, size_t alignment, size_t size)
 {
@@ -47,3 +52,8 @@ int posix_memalign(void **memAddr, size_t alignment, size_t size)
    return ENOERR;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/pthread.c
+++ b/compat/posix/src/pthread.c
@@ -38,6 +38,11 @@
 #include "los_process_pri.h"
 #include "los_sched_pri.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 /*
 * Array of pthread control structures. A pthread_t object is
@@ -435,7 +440,7 @@ int pthread_detach(pthread_t thread)
        /* Set state to detached and kick any joinees to make them return. */
        SCHEDULER_LOCK(intSave);
        if (!(detached->task->taskStatus & OS_TASK_STATUS_EXIT)) {
-            ret = OsTaskSetDetachUnsafe(detached->task);
+            ret = OsTaskSetDeatchUnsafe(detached->task);
            if (ret == ESRCH) {
                ret = LOS_OK;
            } else if (ret == LOS_OK) {
@@ -804,3 +809,8 @@ int pthread_getaffinity_np(pthread_t thread, size_t cpusetsize, cpu_set_t* cpuse
    }
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/pthread_attr.c
+++ b/compat/posix/src/pthread_attr.c
@@ -32,6 +32,11 @@
 #include "pthread.h"
 #include "pprivate.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 int pthread_attr_init(pthread_attr_t *attr)
 {
@@ -275,3 +280,8 @@ int pthread_attr_getaffinity_np(const pthread_attr_t* attr, size_t cpusetsize, c
    return ENOERR;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/pthread_cond.c
+++ b/compat/posix/src/pthread_cond.c
@@ -36,6 +36,11 @@
 #include "los_atomic.h"
 #include "los_event_pri.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 #define BROADCAST_EVENT     1
 #define COND_COUNTER_STEP   0x0004U
@@ -346,3 +351,8 @@ int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
    return ret;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/pthread_mutex.c
+++ b/compat/posix/src/pthread_mutex.c
@@ -31,6 +31,11 @@

 #include "pthread.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 int pthread_mutexattr_init(pthread_mutexattr_t *attr)
 {
@@ -134,3 +139,8 @@ int pthread_mutex_unlock(pthread_mutex_t *mutex)
    return LOS_MuxUnlock(mutex);
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/sched.c
+++ b/compat/posix/src/sched.c
@@ -35,6 +35,11 @@
 #include "unistd.h"
 #include "los_task_pri.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 int sched_get_priority_min(int policy)
 {
@@ -138,3 +143,8 @@ int __sched_cpucount(size_t set_size, const cpu_set_t* set)
    return count;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/semaphore.c
+++ b/compat/posix/src/semaphore.c
@@ -34,6 +34,11 @@
 #include "map_error.h"
 #include "time_posix.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 /* Initialize semaphore to value, shared is not supported in Huawei LiteOS. */
 int sem_init(sem_t *sem, int shared, unsigned int value)
@@ -192,3 +197,8 @@ int sem_unlink(const char *name)
    return -1;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/compat/posix/src/time.c
+++ b/compat/posix/src/time.c
@@ -50,8 +50,11 @@
 #include "los_swtmr_pri.h"
 #include "los_sys_pri.h"

-#define CPUCLOCK_PERTHREAD_MASK 4
-#define CPUCLOCK_ID_OFFSET 3
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 /*
 * Do a time package defined return. This requires the error code
@@ -277,7 +280,7 @@ STATIC VOID OsGetHwTime(struct timespec64 *hwTime)
 {
    UINT64 nowNsec;

-    nowNsec = LOS_CurrNanosec();
+    nowNsec = hi_sched_clock();
    hwTime->tv_sec = nowNsec / OS_SYS_NS_PER_SECOND;
    hwTime->tv_nsec = nowNsec - hwTime->tv_sec * OS_SYS_NS_PER_SECOND;
 }
@@ -428,6 +431,7 @@ int clock_settime(clockid_t clockID, const struct timespec *tp)
        case CLOCK_BOOTTIME:
        case CLOCK_REALTIME_ALARM:
        case CLOCK_BOOTTIME_ALARM:
+        case CLOCK_SGI_CYCLE:
        case CLOCK_TAI:
        case CLOCK_THREAD_CPUTIME_ID:
            TIME_RETURN(ENOTSUP);
@@ -451,82 +455,13 @@ int clock_settime(clockid_t clockID, const struct timespec *tp)
    return settimeofday(&tv, NULL);
 }

-static int PthreadGetCputime(clockid_t clockID, struct timespec *ats)
-{
-    uint64_t runtime;
-    UINT32 intSave;
-    UINT32 tid = ((UINT32) ~((clockID) >> CPUCLOCK_ID_OFFSET));
-
-    if (OS_TID_CHECK_INVALID(tid)) {
-        return -ESRCH;
-    }
-    LosTaskCB *task = OsGetTaskCB(tid);
-
-    if (OsCurrTaskGet()->processID != task->processID) {
-        return -EINVAL;
-    }
-
-    SCHEDULER_LOCK(intSave);
-    runtime = task->taskCpup.allTime;
-    SCHEDULER_UNLOCK(intSave);
-
-    ats->tv_sec = runtime / OS_SYS_NS_PER_SECOND;
-    ats->tv_nsec = runtime % OS_SYS_NS_PER_SECOND;
-
-    return 0;
-}
-
-static int ProcessGetCputime(clockid_t clockID, struct timespec *ats)
-{
-    UINT64 runtime;
-    UINT32 intSave;
-    const pid_t pid = ((pid_t) ~((clockID) >> CPUCLOCK_ID_OFFSET));
-    LosProcessCB *spcb = NULL;
-
-    if (OsProcessIDUserCheckInvalid(pid) || pid < 0) {
-        return -EINVAL;
-    }
-
-    spcb = OS_PCB_FROM_PID(pid);
-    if (OsProcessIsUnused(spcb)) {
-        return -EINVAL;
-    }
-
-    SCHEDULER_LOCK(intSave);
-    runtime = spcb->processCpup.allTime;
-    SCHEDULER_UNLOCK(intSave);
-
-    ats->tv_sec = runtime / OS_SYS_NS_PER_SECOND;
-    ats->tv_nsec = runtime % OS_SYS_NS_PER_SECOND;
-
-    return 0;
-}
-
-static int GetCputime(clockid_t clockID, struct timespec *tp)
-{
-    int ret;
-
-    if (clockID >= 0) {
-        return -EINVAL;
-    }
-
-    if ((UINT32)clockID & CPUCLOCK_PERTHREAD_MASK) {
-        ret = PthreadGetCputime(clockID, tp);
-    } else {
-        ret = ProcessGetCputime(clockID, tp);
-    }
-
-    return ret;
-}
-
 int clock_gettime(clockid_t clockID, struct timespec *tp)
 {
    UINT32 intSave;
    struct timespec64 tmp = {0};
    struct timespec64 hwTime = {0};
-    int ret;

-    if (clockID > MAX_CLOCKS) {
+    if ((clockID > MAX_CLOCKS) || (clockID < CLOCK_REALTIME)) {
        goto ERROUT;
    }

@@ -563,17 +498,11 @@ int clock_gettime(clockid_t clockID, struct timespec *tp)
        case CLOCK_BOOTTIME:
        case CLOCK_REALTIME_ALARM:
        case CLOCK_BOOTTIME_ALARM:
+        case CLOCK_SGI_CYCLE:
        case CLOCK_TAI:
            TIME_RETURN(ENOTSUP);
        default:
-            {
-#ifdef LOSCFG_KERNEL_CPUP
-                ret = GetCputime(clockID, tp);
-                TIME_RETURN(-ret);
-#else
-                TIME_RETURN(EINVAL);
-#endif
-            }
+            goto ERROUT;
    }

    return 0;
@@ -582,45 +511,8 @@ ERROUT:
    TIME_RETURN(EINVAL);
 }

-static int CheckClock(const clockid_t clockID)
-{
-    int error = 0;
-    const pid_t pid = ((pid_t) ~((clockID) >> CPUCLOCK_ID_OFFSET));
-
-    if (!((UINT32)clockID & CPUCLOCK_PERTHREAD_MASK)) {
-        LosProcessCB *spcb = NULL;
-        if (OsProcessIDUserCheckInvalid(pid) || pid < 0) {
-            return -EINVAL;
-        }
-        spcb = OS_PCB_FROM_PID(pid);
-        if (OsProcessIsUnused(spcb)) {
-            error = -EINVAL;
-        }
-    } else {
-        error = -EINVAL;
-    }
-
-    return error;
-}
-
-static int CpuClockGetres(const clockid_t clockID, struct timespec *tp)
-{
-    if (clockID > 0) {
-        return -EINVAL;
-    }
-
-    int error = CheckClock(clockID);
-    if (!error) {
-        error = ProcessGetCputime(clockID, tp);
-    }
-
-    return error;
-}
-
 int clock_getres(clockid_t clockID, struct timespec *tp)
 {
-    int ret;
-
    if (tp == NULL) {
        TIME_RETURN(EINVAL);
    }
@@ -645,17 +537,11 @@ int clock_getres(clockid_t clockID, struct timespec *tp)
        case CLOCK_BOOTTIME:
        case CLOCK_REALTIME_ALARM:
        case CLOCK_BOOTTIME_ALARM:
+        case CLOCK_SGI_CYCLE:
        case CLOCK_TAI:
            TIME_RETURN(ENOTSUP);
        default:
-#ifdef LOSCFG_KERNEL_CPUP
-            {
-                ret = CpuClockGetres(clockID, tp);
-                TIME_RETURN(-ret);
-            }
-#else
            TIME_RETURN(EINVAL);
-#endif
    }

    TIME_RETURN(0);
@@ -678,6 +564,7 @@ int clock_nanosleep(clockid_t clk, int flags, const struct timespec *req, struct
        case CLOCK_BOOTTIME:
        case CLOCK_REALTIME_ALARM:
        case CLOCK_BOOTTIME_ALARM:
+        case CLOCK_SGI_CYCLE:
        case CLOCK_TAI:
            if (flags == 0 || flags == TIMER_ABSTIME) {
                TIME_RETURN(ENOTSUP);
@@ -982,8 +869,8 @@ clock_t clock(VOID)
    clock_t clockMsec;
    UINT64 nowNsec;

-    nowNsec = LOS_CurrNanosec();
-    clockMsec = (clock_t)(nowNsec / (OS_SYS_NS_PER_SECOND / CLOCKS_PER_SEC));
+    nowNsec = hi_sched_clock();
+    clockMsec = (clock_t)(nowNsec / OS_SYS_NS_PER_MS);

    return clockMsec;
 }
@@ -1014,7 +901,6 @@ int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue
        return -1;
    }

-    /* To avoid creating an invalid timer after the timer has already been create */
    if (processCB->timerID == (timer_t)(UINTPTR)MAX_INVALID_TIMER_VID) {
        ret = timer_create(CLOCK_REALTIME, NULL, &timerID);
        if (ret != LOS_OK) {
@@ -1080,7 +966,7 @@ int getitimer(int which, struct itimerval *value)
 }

 #ifdef LOSCFG_KERNEL_VDSO
-VOID OsVdsoTimeGet(VdsoDataPage *vdsoDataPage)
+VOID OsGetVdsoTime(VdsoDataPage *vdsoDataPage)
 {
    UINT32 intSave;
    struct timespec64 tmp = {0};
@@ -1104,3 +990,8 @@ VOID OsVdsoTimeGet(VdsoDataPage *vdsoDataPage)
 }
 #endif

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/config.mk
+++ b/config.mk
--- a/drivers/char/mem/src/mem.c
+++ b/drivers/char/mem/src/mem.c
@@ -32,6 +32,12 @@
 #include "fcntl.h"
 #include "linux/kernel.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+
 static int MemOpen(struct file *filep)
 {
    return 0;
@@ -54,7 +60,6 @@ static ssize_t MemWrite(FAR struct file *filep, FAR const char *buffer, size_t b

 static ssize_t MemMap(FAR struct file *filep, FAR LosVmMapRegion *region)
 {
-#ifdef LOSCFG_KERNEL_VM
    size_t size = region->range.size;
    PADDR_T paddr = region->pgOff << PAGE_SHIFT;
    VADDR_T vaddr = region->range.base;
@@ -73,10 +78,7 @@ static ssize_t MemMap(FAR struct file *filep, FAR LosVmMapRegion *region)
    if (LOS_ArchMmuMap(&space->archMmu, vaddr, paddr, size >> PAGE_SHIFT, region->regionFlags) <= 0) {
        return -EAGAIN;
    }
-#else
-    UNUSED(filep);
-    UNUSED(region);
-#endif
+
    return 0;
 }

@@ -98,3 +100,9 @@ int DevMemRegister(void)
 {
    return register_driver("/dev/mem", &g_memDevOps, 0666, 0); /* 0666: file mode */
 }
+
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/drivers/char/quickstart/Kconfig
+++ b/drivers/char/quickstart/Kconfig
@@ -1,6 +0,0 @@
-config DRIVERS_QUICKSTART
-    bool "Enable QUICKSTART"
-    default y
-    depends on DRIVERS && FS_VFS
-    help
-      Answer Y to enable LiteOS support quickstart frame dev.
--- a/drivers/char/quickstart/include/los_quick_start.h
+++ b/drivers/char/quickstart/include/los_quick_start.h
@@ -29,12 +29,23 @@
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

-#ifndef _LOS_INIT_PRI_H
-#define _LOS_INIT_PRI_H
+#ifndef __LOS_QUICK_START_H__
+#define __LOS_QUICK_START_H__

-#include "los_init.h"
 #include "los_typedef.h"

-VOID OsInitCall(const UINT32 level);
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

-#endif /* _LOS_INIT_PRI_H */
+extern int DevQuickStartRegister(void);
+
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+
+#endif
--- a/drivers/char/quickstart/include/los_quick_start_pri.h
+++ b/drivers/char/quickstart/include/los_quick_start_pri.h
@@ -28,20 +28,25 @@
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
-#ifndef _IT_TEST_SECURITY_VID_H
-#define _IT_TEST_SECURITY_VID_H

-#define _GNU_SOURCE
-#include "osTest.h"
-#include <time.h>
-#include "stdio.h"
-#include <sys/time.h>
-#include <sys/times.h>
+#ifndef __LOS_QUICK_START_PRI_H__
+#define __LOS_QUICK_START_PRI_H__
+
 #include "los_typedef.h"
-#include "sched.h"
-#include "signal.h"

-extern VOID ItSuite_Security_Vid(VOID);
-extern VOID ItSecVid001(VOID);
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

-#endif
+unsigned int OsSystemInitStep2(void);
+extern VOID SystemInit2(VOID);
+
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+
+#endif /* __LOS_QUICK_START_PRI_H__ */
--- a/drivers/char/quickstart/src/qucikstart.c
+++ b/drivers/char/quickstart/src/qucikstart.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ *    conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *    of conditions and the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "los_quick_start_pri.h"
+#include "bits/ioctl.h"
+#include "fcntl.h"
+#include "linux/kernel.h"
+
+#define QUICKSTART_IOC_MAGIC    'T'
+#define QUICKSTART_INITSTEP2    _IO(QUICKSTART_IOC_MAGIC, 0)
+#define QUICKSTART_UNREGISTER   _IO(QUICKSTART_IOC_MAGIC, 1)
+#define QUICKSTART_NODE         "/dev/quickstart"
+
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+
+static int QuickstartOpen(struct file *filep)
+{
+    return 0;
+}
+
+static int QuickstartClose(struct file *filep)
+{
+    return 0;
+}
+
+static void SystemInitStep2(void)
+{
+    static int once = 0;
+    /* Only one call is allowed */
+    if (once != 0) {
+        return;
+    }
+    once = 1;
+
+    unsigned int ret = OsSystemInitStep2();
+    if (ret != LOS_OK) {
+        PRINT_ERR("systemInitStep2 failed\n");
+    }
+}
+
+static int QuickstartDevUnregister(void)
+{
+    return unregister_driver(QUICKSTART_NODE);
+}
+
+static ssize_t QuickstartIoctl(struct file *filep, int cmd, unsigned long arg)
+{
+    switch (cmd) {
+        case QUICKSTART_INITSTEP2:
+            SystemInitStep2();
+            break;
+        case QUICKSTART_UNREGISTER:
+            QuickstartDevUnregister();
+            break;
+
+        default:
+            break;
+    }
+    return 0;
+}
+
+static const struct file_operations_vfs g_quickstartDevOps = {
+    QuickstartOpen,  /* open */
+    QuickstartClose, /* close */
+    NULL,  /* read */
+    NULL, /* write */
+    NULL,      /* seek */
+    QuickstartIoctl,      /* ioctl */
+    NULL,   /* mmap */
+#ifndef CONFIG_DISABLE_POLL
+    NULL,      /* poll */
+#endif
+    NULL,      /* unlink */
+};
+
+int DevQuickStartRegister(void)
+{
+    return register_driver(QUICKSTART_NODE, &g_quickstartDevOps, 0666, 0); /* 0666: file mode */
+}
+
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/drivers/char/quickstart/src/quickstart.c
+++ b/drivers/char/quickstart/src/quickstart.c
@@ -1,141 +0,0 @@
-/*
- * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this list of
- *    conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice, this list
- *    of conditions and the following disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * 3. Neither the name of the copyright holder nor the names of its contributors may be used
- *    to endorse or promote products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "los_dev_quickstart.h"
-#include "fcntl.h"
-#include "linux/kernel.h"
-#include "los_process_pri.h"
-#include "fs/fs.h"
-
-EVENT_CB_S g_qsEvent;
-static SysteminitHook g_systemInitFunc[QS_STAGE_CNT] = {0};
-static char g_callOnce[QS_STAGE_CNT] = {0};
-
-static int QuickstartOpen(struct file *filep)
-{
-    return 0;
-}
-
-static int QuickstartClose(struct file *filep)
-{
-    return 0;
-}
-
-static int QuickstartNotify(unsigned int events)
-{
-    int ret = LOS_EventWrite((PEVENT_CB_S)&g_qsEvent, events);
-    if (ret != 0) {
-        PRINT_ERR("%s,%d:0x%x\n", __FUNCTION__, __LINE__, ret);
-        ret = -EINVAL;
-    }
-    return ret;
-}
-
-#define WAITLIMIT    300000 /* 5min = 5*60*1000*1tick(1ms) */
-
-static int QuickstartListen(unsigned long arg)
-{
-    QuickstartListenArgs args;
-    if (copy_from_user(&args, (QuickstartListenArgs __user *)arg, sizeof(QuickstartListenArgs)) != LOS_OK) {
-        PRINT_ERR("%s,%d,failed!\n", __FUNCTION__, __LINE__);
-        return -EINVAL;
-    }
-    if (args.wait > WAITLIMIT) {
-        args.wait = WAITLIMIT;
-        PRINT_ERR("%s wait arg is too longer, set to WAITLIMIT!\n", __FUNCTION__);
-    }
-    int ret = LOS_EventRead((PEVENT_CB_S)&g_qsEvent, args.events, LOS_WAITMODE_AND | LOS_WAITMODE_CLR, args.wait);
-    if (ret != args.events && ret != 0) {  /* 0: nowait is normal case */
-        PRINT_ERR("%s,%d:0x%x\n", __FUNCTION__, __LINE__, ret);
-        ret = -EINVAL;
-    }
-    return ret;
-}
-
-void QuickstartHookRegister(LosSysteminitHook hooks)
-{
-    for (int i = 0; i < QS_STAGE_CNT; i++) {
-        g_systemInitFunc[i] = hooks.func[i];
-    }
-}
-
-static int QuickstartStageWorking(unsigned int level)
-{
-    if ((level < QS_STAGE_CNT) && (g_callOnce[level] == 0) && (g_systemInitFunc[level] != NULL)) {
-        g_callOnce[level] = 1;    /* 1: Already called */
-        g_systemInitFunc[level]();
-    } else {
-        PRINT_WARN("Trigger quickstart,but doing nothing!!\n");
-    }
-    return 0;
-}
-
-static int QuickstartDevUnlink(struct Vnode *node)
-{
-    (void)node;
-    return unregister_driver(QUICKSTART_NODE);
-}
-
-static ssize_t QuickstartIoctl(struct file *filep, int cmd, unsigned long arg)
-{
-    ssize_t ret;
-    if (cmd == QUICKSTART_NOTIFY) {
-        return QuickstartNotify(arg);
-    }
-
-    if (OsGetUserInitProcessID() != LOS_GetCurrProcessID()) {
-        PRINT_ERR("Permission denios!\n");
-        return -EACCES;
-    }
-    switch (cmd) {
-        case QUICKSTART_LISTEN:
-            ret = QuickstartListen(arg);
-            break;
-        default:
-            ret = QuickstartStageWorking(cmd - QUICKSTART_STAGE(QS_STAGE1));  /* ioctl cmd converted to stage level */
-            break;
-    }
-    return ret;
-}
-
-static const struct file_operations_vfs g_quickstartDevOps = {
-    .open = QuickstartOpen, /* open */
-    .close = QuickstartClose, /* close */
-    .ioctl = QuickstartIoctl, /* ioctl */
-    .unlink = QuickstartDevUnlink, /* unlink */
-};
-
-int QuickstartDevRegister(void)
-{
-    LOS_EventInit(&g_qsEvent);
-    return register_driver(QUICKSTART_NODE, &g_quickstartDevOps, 0644, 0); /* 0644: file mode */
-}
-
--- a/drivers/char/random/src/random.c
+++ b/drivers/char/random/src/random.c
@@ -33,6 +33,11 @@
 #include "fcntl.h"
 #include "linux/kernel.h"

+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */

 static unsigned long g_randomMax =  0x7FFFFFFF;

@@ -53,7 +58,7 @@ static unsigned long g_seed = 1;

 int RanOpen(struct file *filep)
 {
-    g_seed = (unsigned long)(LOS_CurrNanosec() & 0xffffffff);
+    g_seed = (unsigned long)(hi_sched_clock() & 0xffffffff);
    return 0;
 }

@@ -91,7 +96,7 @@ ssize_t RanRead(struct file *filep, char *buffer, size_t buflen)
    return (buflen - len); /* return a successful len */
 }

-static ssize_t RanMap(FAR struct file *filep, FAR LosVmMapRegion *region)
+static ssize_t RanMap(FAR struct file* filep, FAR LosVmMapRegion *region)
 {
    PRINTK("%s %d, mmap is not support\n", __FUNCTION__, __LINE__);
    return 0;
@@ -116,3 +121,8 @@ int DevRandomRegister(void)
    return register_driver("/dev/random", &g_ranDevOps, 0666, 0); /* 0666: file mode */
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/drivers/char/random/src/random_hw.c
+++ b/drivers/char/random/src/random_hw.c
@@ -120,3 +120,8 @@ int DevUrandomRegister(void)
    return -EPERM;
 }

+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
--- a/fs/fat/Kconfig
+++ b/fs/fat/Kconfig
@@ -39,5 +39,5 @@ config FS_FAT_VOLUMES

 config FS_FAT_DISK
    bool "Enable partinfo for storage device"
-    depends on FS_VFS && (FS_FAT || DRIVERS_MMC || DRIVERS_USB)
+    depends on FS_FAT || DRIVERS_MMC || DRIVERS_USB
    default y
--- a/fs/fat/Makefile
+++ b/fs/fat/Makefile
@@ -37,9 +37,7 @@ LOCAL_SRCS += $(wildcard $(LITEOSTHIRDPARTY)/FatFs/source/*.c)
 LOCAL_INCLUDE := \
 	-I $(LITEOSTHIRDPARTY)/FatFs/source \
 	-I $(LITEOSTOPDIR)/fs/fat/os_adapt \
-	-I $(LITEOSTOPDIR)/fs/fat/virpart/include \
-	-I $(LITEOSTOPDIR)/fs/vfs \
-	-I $(LITEOSTHIRDPARTY)/NuttX/include
+	-I $(LITEOSTOPDIR)/fs/fat/virpart/include

 LOCAL_FLAGS := $(LOCAL_INCLUDE) $(LITEOS_GCOV_OPTS)

--- a/fs/fat/os_adapt/dirop_fat.c
+++ b/fs/fat/os_adapt/dirop_fat.c
@@ -0,0 +1,274 @@
+/*
+ * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ *    conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *    of conditions and the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "dirop_fat.h"
+#include "fatfs.h"
+#include "errno.h"
+#include "fs/fs.h"
+#include "inode/inode.h"
+#include "integer.h"
+#include "string.h"
+
+#ifdef LOSCFG_FS_FAT
+
+#ifdef __cplusplus
+#if __cplusplus
+extern "C"{
+#endif
+#endif	/* __cplusplus */
+
+extern const struct mountpt_operations fat_operations;
+#define SECTOR_SIZE		512
+#define FIRST_MALLOC_SIZE	10
+
+static INT vfat_check_path(const char *path)
+{
+	struct inode *inode_ptr = NULL;
+	char *fullpath = NULL;
+	INT ret = vfs_normalize_path((const char *)NULL, path, &fullpath);
+	struct inode_search_s desc;
+
+	if (ret < ENOERR) {
+		ret = -ret;
+		set_errno(ret);
+		return FAT_ERROR;
+	}
+
+	SETUP_SEARCH(&desc, fullpath, false);
+	ret = inode_find(&desc);
+	if (ret < 0) {
+		PRINT_ERR("ERROR: Failed to find %s\n", fullpath);
+		ret = -ret;
+		set_errno(ret);
+		return FAT_ERROR;
+	}
+	inode_ptr = desc.node;
+
+	free(fullpath);
+
+	if (inode_ptr && (inode_ptr->u.i_mops == &fat_operations)) {
+		inode_release(inode_ptr);
+		return ENOERR;
+	}
+
+	return FAT_ERROR;
+}
+
+static DIR_FAT *initdir_fat(DIR *dp)
+{
+	DIR_FAT *dir_fat = NULL;
+
+	if (dp != NULL) {
+		dir_fat = (DIR_FAT *)malloc(sizeof(DIR_FAT) + PATH_MAX);
+		if (dir_fat != NULL) {
+			(void)memset_s(dir_fat, sizeof(DIR_FAT) + PATH_MAX, 0, sizeof(DIR_FAT) + PATH_MAX);
+
+			dir_fat->stDirStream.dd_nextloc = 0;
+			dir_fat->stDirStream.dd_size = 0;
+			dir_fat->stBuf.d_count = SECTOR_SIZE;
+			dir_fat->stBuf.d_usecount = 0;
+
+			(void)pthread_mutex_init(&(dir_fat->stDirStream.dd_lock), (const pthread_mutexattr_t *)NULL);
+			dir_fat->stDirStream.dp = dp;
+
+			return dir_fat;
+		}
+
+	(void)closedir(dp);
+	}
+
+	return NULL;
+}
+
+DIR_FAT *opendir_fat(const char *name)
+{
+	INT ret;
+	DIR *dp = NULL;
+
+	ret = vfat_check_path(name);
+	if (ret) {
+		return NULL;
+	}
+
+	dp = opendir(name);
+
+	return initdir_fat(dp);
+}
+
+int closedir_fat(DIR_FAT *dir_fat)
+{
+	INT ret;
+
+	if (dir_fat == NULL) {
+		return FAT_ERROR;
+	}
+
+	ret = closedir(dir_fat->stDirStream.dp);
+	if (ret == ENOERR) {
+		(void)pthread_mutex_destroy(&(dir_fat->stDirStream.dd_lock));
+		free(dir_fat);
+	}
+
+	return ret;
+}
+
+extern int fatfs_readdir_all(DIR_FAT *dir_fat);
+
+struct fat_direntall *readdir_fat(DIR_FAT *dir_fat)
+{
+	INT ret;
+	struct fat_direntall *de = (struct fat_direntall *)NULL;
+
+	if (dir_fat == NULL) {
+		return NULL;
+	}
+
+	if (pthread_mutex_lock(&(dir_fat->stDirStream.dd_lock)) != ENOERR) {
+		return NULL;
+	}
+
+	ret = fatfs_readdir_all(dir_fat);
+	if (!ret) {
+		de = &(dir_fat->stBuf.direntall);
+	}
+
+	if (pthread_mutex_unlock(&(dir_fat->stDirStream.dd_lock)) != ENOERR)
+		PRINT_ERR("readdir_fat mutex unlock error \n");
+	return de;
+}
+
+static struct fat_direntall **scandir_fat_remalloc_names(struct fat_direntall **names,
+	UINT *names_size, UINT pos, bool *failed)
+{
+	struct fat_direntall **new_direntall = NULL;
+	INT32 ret;
+
+	if (pos == *names_size) {
+
+		if (*names_size == 0) {
+			*names_size = FIRST_MALLOC_SIZE;
+		} else {
+			*names_size <<= 1;
+		}
+
+		new_direntall = (struct fat_direntall **)malloc(*names_size * sizeof(struct fat_direntall *));
+		if (new_direntall == NULL) {
+			*failed = 1;
+			return  names;
+		}
+
+		if (names != NULL) {
+			ret = memcpy_s(new_direntall, (*names_size) * sizeof(struct fat_direntall *),
+				names, pos * sizeof(struct fat_direntall *));
+			if (ret != EOK){
+				*failed = 1;
+				free(new_direntall);
+				return names;
+			}
+			free(names);
+		}
+		return new_direntall;
+	}
+	return names;
+}
+
+int scandir_fat(const char *dir, struct fat_direntall ***namelist,
+	int (*selector) (const struct fat_direntall *),
+	int (*compar) (const struct fat_direntall **, const struct fat_direntall **))
+{
+	DIR_FAT *dp = opendir_fat(dir);
+	struct fat_direntall *current = NULL;
+	struct fat_direntall **names = NULL;
+	struct fat_direntall *vnew = NULL;
+	UINT names_size = 0;
+	UINT pos = 0;
+	UINT dsize;
+	bool failed = 0;
+	INT use_it;
+
+	if (dp == NULL) {
+		return FAT_ERROR;
+	}
+
+	current = readdir_fat(dp);
+	while (current != NULL) {
+		use_it = (selector == NULL);
+		if (!use_it) {
+			use_it = (*selector) (current);
+		}
+		if (use_it) {
+			names = scandir_fat_remalloc_names(names, &names_size, pos, &failed);
+			if (failed == 1) {
+				break;
+			}
+
+			dsize = current->d_reclen;
+			vnew = (struct fat_direntall *)malloc(dsize);
+			if (vnew == NULL) {
+				failed = 1;
+			    break;
+			}
+
+			(void)memcpy_s(vnew, dsize, current, dsize);
+			names[pos++] = vnew;
+		}
+		current = readdir_fat(dp);
+	}
+
+	if (failed == 1) {
+		(void)closedir_fat(dp);
+		while (pos > 0) {
+			free(names[--pos]);
+		}
+
+		if (names != NULL) {
+			free(names);
+		}
+
+		return FAT_ERROR;
+	}
+
+	(void)closedir_fat(dp);
+
+	/* Sort the list if we have a comparison function to sort with.  */
+	if (compar != NULL && names != NULL) {
+		qsort((void *)names, pos, sizeof (struct fat_direntall *), (int (*)(const void *, const void *))*compar);
+	}
+	*namelist = names;
+	return pos;
+}
+
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif
+#endif	/* __cplusplus */
+#endif	/* CONFIG_FS_FAT */
--- a/fs/fat/os_adapt/dirop_fat.h
+++ b/fs/fat/os_adapt/dirop_fat.h
@@ -0,0 +1,195 @@
+/*
+ * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
+ * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ *    conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *    of conditions and the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @defgroup fat Fat
+ * @ingroup filesystem
+ */
+
+#ifndef _DIROP_FAT_H
+#define _DIROP_FAT_H
+
+#include "pthread.h"
+#include "dirent.h"
+#ifdef LOSCFG_FS_FAT
+
+#ifdef __cplusplus
+#if __cplusplus
+extern "C"{
+#endif
+#endif /* __cplusplus */
+
+#define TIME_LENGTH 8
+
+struct fat_direntall {
+	unsigned long	d_ino;
+	unsigned long	d_off;
+	unsigned char	d_type;
+	unsigned int	d_size;
+	char		d_createtime[TIME_LENGTH];
+	unsigned short	d_reclen;
+	char		d_name[1];
+};
+
+struct fat_direntall_buf {
+	int	d_count;
+	int	d_usecount;
+	struct fat_direntall	direntall;
+};
+
+struct dirstream_fat {
+	DIR		*dp;
+
+	/* offset of the next dir entry in buffer */
+	unsigned int	dd_nextloc;
+
+	/* bytes of valid entries in buffer */
+	unsigned int	dd_size;
+
+	pthread_mutex_t	dd_lock;
+};
+
+typedef struct fat_dir{
+	struct dirstream_fat		stDirStream;
+	struct fat_direntall_buf	stBuf;
+} DIR_FAT;
+
+/**
+ * @ingroup  fat
+ * @brief open a directory
+ *
+ * @par Description:
+ * This API is used to open a directory stream corresponding to the directory name, and
+ * returns a pointer to the directory stream.
+ *
+ * @attention
+ * <ul>
+ * <li>The parameter name should be a valid string.</li>
+ * </ul>
+ *
+ * @param  name [IN] the directory to open.
+ *
+ * @retval #NULL                           Open directory unsuccessfully and set errno.
+ * @retval #DIR_FAT*                       A pointer to the directory stream.
+ * @par Dependency:
+ * <ul><li>dirop_fat.h: the header file that contains the API declaration.</li></ul>
+ * @see closedir_fat
+ */
+DIR_FAT *opendir_fat(const char *name);
+
+/**
+ * @ingroup  fat
+ * @brief close a directory
+ *
+ * @par Description:
+ * This API is used to close the directory stream associated with dirp.
+ *
+ * @attention
+ * <ul>
+ * <li>The parameter dir_fat should be a valid pointer which opendir_fat returns.</li>
+ * </ul>
+ *
+ * @param  dir_fat [IN] Directory object structure pointer which opendir_fat returns.
+ *
+ * @retval #FAT_ERROR                     The directory dirp close unsuccessfully and set errno.
+ * @retval #OK                            The directory dirp close successfully.
+ * @par Dependency:
+ * <ul><li>dirop_fat.h: the header file that contains the API declaration.</li></ul>
+ * @see opendir_fat
+ */
+int closedir_fat(DIR_FAT *dir_fat);
+
+/**
+ * @ingroup  fat
+ * @brief read a directory
+ *
+ * @par Description:
+ * This API is used to get a pointer to a dirent structure
+ * representing the next directory entry in the directory stream pointed
+ * to by dirp.
+ *
+ * @attention
+ * <ul>
+ * <li>The parameter dir_fat should be a valid pointer which opendir_fat returns.</li>
+ * </ul>
+ *
+ * @param  dir_fat [IN] An instance of type DIR created by a previous call to opendir_fat().
+ *
+ * @retval #NULL                       Reaching the end of the directory stream or if an error occurred and set errno.
+ * @retval #fat_direntall*             A pointer to a dirent structure.
+ * @par Dependency:
+ * <ul><li>dirop_fat.h: the header file that contains the API declaration.</li></ul>
+ * @see opendir_fat
+ */
+struct fat_direntall *readdir_fat(DIR_FAT *dir_fat);
+
+/**
+* @ingroup fat
+* @brief scan a directory for matching entries.
+*
+* @par Description:
+* The scandir_fat() function scans the directory dirp, calling selector() in
+* each directory entry. Entries for which selector() returns nonzero are
+* stored in strings allocated via malloc, sorted using qsort with
+* the comparison function compar(), and collected in array namelist
+* which is allocated via malloc. If filter is NULL, all entries are
+* selected, compare with scandir(), scandir_fat() can get the create-time of
+* file.
+*
+* @attention
+* <ul>
+* <li></li>
+* </ul>
+*
+* @param dir      [IN]  Type #const char* a pointer to directory information.
+* @param namelist [OUT] Type #const struct fat_direntall*** a pointer to collected directory entries.
+* @param selector [IN]  Type #int(*selector)(const struct fat_direntall*) a filter type function.
+* @param compar   [IN]  Type #int(*compar)(const struct fat_direntall**,const struct dirent**) a compar type function.
+*
+* @retval #int The number of directory entries selected.
+* @retval #<0  An error occurred.
+* @par Dependency:
+* <ul><li>dirop_fat.h: the header file that contains the API declaration.</li></ul>
+* @see readdir_fat
+*/
+int scandir_fat(const char *dir, struct fat_direntall ***namelist,
+	int (*selector) (const struct fat_direntall *),
+	int (*compar) (const struct fat_direntall **, const struct fat_direntall **));
+
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif
+#endif /* __cplusplus */
+
+#endif /* LOSCFG_FS_FAT */
+
+#endif /* _DIROP_FAT_H */
--- a/fs/fat/os_adapt/fat_shellcmd.c
+++ b/fs/fat/os_adapt/fat_shellcmd.c
@@ -45,8 +45,8 @@ int osShellCmdFormat(int argc, char **argv)
    if (argc < 3) { /* 3, at least 3 params for this shell command. */
        perror("format error");
        PRINTK("Usage  :\n");
-        PRINTK("        format <dev_vnodename> <sectors> <option> <label>\n");
-        PRINTK("        dev_vnodename : the name of dev\n");
+        PRINTK("        format <dev_inodename> <sectors> <option> <label>\n");
+        PRINTK("        dev_inodename : the name of dev\n");
        PRINTK("        sectors       : Size of allocation unit in unit of byte or sector, ");
        PRINTK("0 instead of default size\n");
        PRINTK("        options       : Index of filesystem. 1 for FAT filesystem, ");
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
openharmony_ci	b744cfa164	!385 SIOCGIFCONF iotcl，用户态到内核态申请内存大小错误 Merge pull request !385 from 刘建东/cherry-pick-1625021431	2021-07-05 00:49:11 +00:00
YOUR_NAME	51a24eaeb2	fixed `4496e71` from https://gitee.com/life-liu/kernel_liteos_a/pulls/373 fixed `bfd27e7` from https://gitee.com/life-liu/kernel_liteos_a/pulls/355 fix: SIOCGIFCONF ioctl malloc size error in kernel use struct ifconf and ifc_buf size malloc memory close: #I3XEZ3 Signed-off-by: liujiandong <liujiandong1@huawei.com>	2021-06-30 11:31:08 +08:00
openharmony_ci	07fb6c150e	!330 修改lwip_enhanced编译脚本，更新lwip_enhanced lwip版本到2.1.2 Merge pull request !330 from 刘建东/pr_329	2021-06-17 17:01:38 +08:00
openharmony_ci	7ceaf68832	!319 fix: avoid compile warning ignored Merge pull request !319 from MGY917/citu_clean_release	2021-06-17 15:53:35 +08:00
YOUR_NAME	309e7569f8	chore: update lwip_enhanced lwip version to 2.1.2 update lwip version to 2.1.2 for lwip_enhanced close: #I3VXAP Signed-off-by: liujiandong <liujiandong1@huawei.com>	2021-06-17 15:21:24 +08:00
openharmony_ci	e42cb26b14	!324 fix: v1.1.0的reset_vector_up/mp.S bug修复同步自master Merge pull request !324 from MGY917/start_up_bug_fix	2021-06-17 13:54:56 +08:00
Guangyao Ma	8ab4c9a6bc	fix: v1.1.0的reset_vector_up/mp.S bug修复同步自master Close #I3VQGN Change-Id: I3772fde91067433c18b34fe2157abf05fa75fd73 Signed-off-by: Guangyao Ma <guangyao.ma@outlook.com>	2021-06-16 17:23:40 +08:00
Guangyao Ma	a40dc411b2	fix: avoid compile warning ignored Close #I3VOAO Change-Id: I42103e0e7061e50f8d63df98ea9f5cecd49fe6f4 Signed-off-by: Guangyao Ma <guangyao.ma@outlook.com>	2021-06-15 20:06:09 +08:00
openharmony_ci	ebe33aa2f6	!299 删除PRINTK维测log Merge pull request !299 from 刘建东/OpenHarmony_1.0.1_release	2021-06-09 13:51:24 +08:00
YOUR_NAME	ece0e8ae06	IssueNo:#I3UKNE Description:delete PRINTK log Sig:phone Feature or Bugfix:Bugfix Binary Source:No Signed-off-by: YOUR_NAME <liujiandong1@huawei.com>	2021-06-07 12:01:52 +08:00
openharmony_ci	c059be5ec8	!237 lwip crash问题增加维测log Merge pull request !237 from 刘建东/OpenHarmony_1.0.1_release	2021-05-13 09:33:15 +08:00
YOUR_NAME	723b3ff8e2	IssueNo:#I3R13T Description:add log for lwip crash Sig:phone Feature or Bugfix:Bugfix Binary Source:No	2021-05-12 17:15:44 +08:00
openharmony_ci	7cf342c29f	!195 clang编译的系统镜像内核栈回溯功能失效 Merge pull request !195 from zhangfanfan2/OpenHarmony_1.0.1_release	2021-04-28 14:44:13 +08:00
YOUR_NAME	3b9ccc839e	fix:solve the problem of stack backtrace failure for llvm. Change-Id: I0b0426e0e529cb6517d6a2712c6862ebbcea2239	2021-04-28 10:33:10 +08:00
openharmony_ci	4f1e1619a5	!161 【轻量级 PR】：调度中存在有符号数与无符号数比较 Merge pull request !161 from zhushengle/N/A	2021-04-20 14:12:58 +08:00
openharmony_ci	6523c496c8	!159 同步master 分支已修复问题： setitimer 中定时给进程发信号时未持有调度锁，导致踩内存等问题 Merge pull request !159 from zhushengle/OpenHarmony_1.0.1_release	2021-04-20 14:12:53 +08:00
zhushengle	7648648887	调度中存在有符号数与无符号数比较	2021-04-20 10:06:48 +08:00
zhushengle	1c0bbb66de	fix:setitimer are downregulated for multicore scenarios, and are static, resulting in inconsistent behavior. Close #I3EBOI Change-Id: I71a86b8f2b7451e886a08dfc7f274287107df916	2021-04-20 09:54:00 +08:00
zhushengle	d44f3904cf	fix:the setitimer signals the process to be locked at a fixed time. There is a static problem. Close #I3H7TO Change-Id: Iccfb458ed43f761fde1f943e0005f4ac1bf425bc	2021-04-20 09:25:36 +08:00
openharmony_ci	5cbb83dc6e	!126 Add issue and PR template for release Merge pull request !126 from 马明帅/add_issus_pr_template_for_release	2021-04-08 08:40:31 +08:00
mamingshuai	13fa3d4403	add issue and pr template	2021-04-07 14:49:43 +08:00
openharmony_ci	e9522d44bf	!121 release【bug】sigaction中sigsuspend的后执行信号顺序与预期不符，信号注册时未屏蔽用户传入信号屏蔽字段 Merge pull request !121 from give-me-five/OpenHarmony_1.0.1_release	2021-04-04 17:40:08 +08:00
x_xiny	f30790c5c8	signal Change-Id: Ia42e914b7a19b7d519010e371f808baa1c6588c0	2021-04-04 16:23:24 +08:00
openharmony_ci	a0bb801f67	!114 Fix OHOS shell cannot ls a file for branch release Merge pull request !114 from ysy4tc3/fork_release	2021-04-01 14:47:03 +08:00
Far	170aa8ba6f	Description: fix OHOS shell cannot ls a file Change-Id: Ie13485cc2406882985405db0599666690c25dc1f	2021-04-01 09:44:37 +08:00
openharmony_ci	83b0e8f867	!89 内核构建增加从vendor下面copy配置文件的方式 Merge pull request !89 from zhangfanfan2/OpenHarmony_1.0.1_release	2021-03-24 09:46:05 +08:00
YOUR_NAME	6b5d6be42d	[Desc]Modify the vendor configuration file path because the product_path is changed to an absolute path. Change-Id: If034609155528a76cca72f3f0d85096f09478cd2	2021-03-23 22:42:12 +08:00
openharmony_ci	8b27064848	!84 update readme Merge pull request !84 from Harylee/release	2021-03-23 10:08:37 +08:00
openharmony_ci	1ad74ab8e4	!79 update ReadME.md Merge pull request !79 from Harylee/noEmployeeNum_ChangeID_13291521_lihao	2021-03-22 19:12:48 +08:00