diff --git a/Ubiquitous/XiZi_AIoT/softkernel/memory/pagetable_riscv.c b/Ubiquitous/XiZi_AIoT/softkernel/memory/pagetable_riscv.c
new file mode 100644
index 000000000..53404786f
--- /dev/null
+++ b/Ubiquitous/XiZi_AIoT/softkernel/memory/pagetable_riscv.c
@@ -0,0 +1,278 @@
+/*
+ * Copyright (c) 2020 AIIT XUOS Lab
+ * XiUOS is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *        http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+/**
+ * @file pagetable.c
+ * @brief build page table
+ * @version 3.0
+ * @author AIIT XUOS Lab
+ * @date 2023.08.25
+ */
+
+/*************************************************
+File name: pagetable.c
+Description: build page table
+Others:
+History:
+1. Date: 2023-08-28
+Author: AIIT XUOS Lab
+Modification:
+1. first version
+*************************************************/
+#include "memlayout.h"
+
+#include "trap_common.h"
+
+#include "assert.h"
+#include "buddy.h"
+#include "kalloc.h"
+#include "pagetable.h"
+
+static struct PagerRightGroup right_group;
+struct MmuCommonDone* _p_pgtbl_mmu_access = NULL;
+static bool _new_pgdir(struct TopLevelPageDirectory* pgdir)
+{
+    void* new_pgdir_addr = 0;
+    if (UNLIKELY((new_pgdir_addr = kalloc(TOPLEVLE_PAGEDIR_SIZE)) == NULL)) {
+        return false;
+    }
+
+    pgdir->pd_addr = new_pgdir_addr;
+
+    memset(new_pgdir_addr, 0, TOPLEVLE_PAGEDIR_SIZE);
+    return true;
+}
+
+static bool _map_pages(uintptr_t* pgdir, uintptr_t vaddr, uintptr_t paddr, intptr_t len, uintptr_t attr)
+{
+    assert(len >= 0);
+    vaddr = ALIGNDOWN(vaddr, LEVEL4_PTE_SIZE);
+    paddr = ALIGNDOWN(paddr, LEVEL4_PTE_SIZE);
+    uintptr_t vaddr_last = ALIGNDOWN(vaddr + len - 1, LEVEL4_PTE_SIZE);
+
+    while (true) {
+        uintptr_t* pte = NULL;
+        if ((pte = _page_walk(pgdir, vaddr, true)) == NULL) {
+            ERROR("pte not found for vaddr %p.\n", vaddr);
+            return false;
+        }
+
+        if (UNLIKELY(*pte != 0)) {
+            ERROR("remapping: vaddr: %p | paddr: %p | pte: %p |\n", vaddr, paddr, *pte);
+            return false;
+        }
+
+        *pte = paddr | attr;
+
+        if (vaddr == vaddr_last) {
+            break;
+        }
+
+        vaddr += PAGE_SIZE;
+        paddr += PAGE_SIZE;
+    }
+
+    assert(vaddr == vaddr_last);
+    return true;
+}
+
+static bool _unmap_pages(uintptr_t* pgdir, uintptr_t vaddr, int len)
+{
+    assert(len >= 0);
+    vaddr = ALIGNDOWN(vaddr, LEVEL4_PTE_SIZE);
+    uintptr_t vaddr_last = ALIGNDOWN(vaddr + len - 1, LEVEL4_PTE_SIZE);
+
+    while (true) {
+        uintptr_t* pte = NULL;
+        if ((pte = _page_walk(pgdir, vaddr, false)) == NULL) {
+            ERROR("pte not found for vaddr %p.\n", vaddr);
+            return false;
+        }
+
+        if (*pte == 0) {
+            ERROR("unmap a unmapped page, vaddr: %p, pte: %p\n", vaddr, *pte);
+            return false;
+        }
+
+        *pte = 0;
+
+        if (vaddr == vaddr_last) {
+            break;
+        }
+
+        vaddr += PAGE_SIZE;
+    }
+
+    assert(vaddr == vaddr_last);
+    return true;
+}
+
+/// @brief map paddr to vaddr for given pgdir (user only)
+/// @param pgdir vaddr of pgdir
+/// @param vaddr
+/// @param paddr
+/// @param len
+/// @param is_dev
+/// @return
+static bool _map_user_pages(struct MemSpace* pmemspace, uintptr_t vaddr, uintptr_t paddr, int len, bool is_dev)
+{
+    if (len < 0) {
+        return false;
+    }
+
+    if (UNLIKELY(vaddr >= USER_MEM_TOP)) {
+        ERROR("mapping kernel space.\n");
+        return false;
+    }
+
+    uintptr_t mem_attr = 0;
+    if (LIKELY(!is_dev)) {
+        _p_pgtbl_mmu_access->MmuUsrPteAttr(&mem_attr);
+    } else {
+        _p_pgtbl_mmu_access->MmuUsrDevPteAttr(&mem_attr);
+    }
+
+    return _map_pages(pmemspace->pgdir.pd_addr, vaddr, paddr, (intptr_t)len, mem_attr);
+}
+
+/// assume that a user pagedir is allocated from [0, size)
+/// if new_size > old_size, allocate more space,
+/// if old_size > new_size, free extra space, to avoid unnecessary alloc/free.
+static uintptr_t _resize_user_pgdir(struct MemSpace* pmemspace, uintptr_t old_size, uintptr_t new_size)
+{
+    if (UNLIKELY(new_size > USER_MEM_TOP)) {
+        ERROR("user size out of range.\n");
+        return old_size;
+    }
+    if (UNLIKELY(new_size < old_size)) {
+        /// @todo: free extra space.
+        return old_size;
+    }
+
+    uintptr_t cur_size = ALIGNUP(old_size, PAGE_SIZE);
+    uintptr_t size_needed = ALIGNUP(new_size, PAGE_SIZE) - cur_size;
+
+    char* new_page = kalloc(size_needed);
+    if (new_page == NULL) {
+        ERROR("No memory\n");
+        return cur_size;
+    }
+    memset(new_page, 0, size_needed);
+    if (!xizi_pager.map_pages(pmemspace, cur_size, V2P(new_page), size_needed, false)) {
+        return cur_size;
+    }
+    CreateResourceTag(NULL, &pmemspace->tag, NULL, TRACER_MEM_FROM_BUDDY_AC_RESOURCE, V2P_WO(new_page));
+
+    return new_size;
+}
+
+/// @brief translate virt address to phy address with pgdir
+/// @param pgdir
+/// @param vaddr accept only page aligned address
+/// @return paddr of pgdir(vaddr); zero for unmapped addr
+static uintptr_t _address_translate(struct TopLevelPageDirectory* pgdir, uintptr_t vaddr)
+{
+    assert(vaddr % PAGE_SIZE == 0);
+    const uintptr_t* const pte = _page_walk(pgdir->pd_addr, vaddr, false);
+    if (pte == NULL || *pte == 0) {
+        return 0;
+    }
+    return (uintptr_t)ALIGNDOWN(*pte, PAGE_SIZE);
+}
+
+static uintptr_t _cross_vspace_data_copy_in_page(struct TopLevelPageDirectory* pgdir, uintptr_t cross_dest, uintptr_t src, uintptr_t len)
+{
+    uintptr_t cross_dest_end = cross_dest + len;
+    assert(ALIGNUP(cross_dest, PAGE_SIZE) == ALIGNUP(cross_dest_end, PAGE_SIZE));
+
+    uintptr_t paddr = xizi_pager.address_translate(pgdir, ALIGNDOWN(cross_dest, PAGE_SIZE));
+    uintptr_t offset = cross_dest - ALIGNDOWN(cross_dest, PAGE_SIZE);
+    uintptr_t* vdest = (uintptr_t*)((uintptr_t)P2V(paddr) + offset);
+    uintptr_t* vsrc = (uintptr_t*)src;
+    memcpy(vdest, vsrc, len);
+    return len;
+}
+
+/// @brief copy data from src(kernel vspace) to dest of pgdir vspace
+/// @param pgdir
+/// @param cross_dest vaddress in pgdir
+/// @param src
+/// @param len
+/// @return
+static uintptr_t _cross_vspace_data_copy(struct TopLevelPageDirectory* pgdir, uintptr_t cross_dest, uintptr_t src, uintptr_t len)
+{
+    uintptr_t len_to_top = ALIGNUP(cross_dest, PAGE_SIZE) - cross_dest;
+
+    uintptr_t copied_len = 0;
+    while (copied_len < len) {
+        uintptr_t current_copy_len = len_to_top >= len ? len : len_to_top;
+
+        current_copy_len = _cross_vspace_data_copy_in_page(pgdir, cross_dest, src, current_copy_len);
+
+        // update variables
+        copied_len += current_copy_len;
+        cross_dest += current_copy_len;
+        src += current_copy_len;
+        len_to_top = ALIGNDOWN(cross_dest + PAGE_SIZE, PAGE_SIZE) - ALIGNDOWN(cross_dest, PAGE_SIZE); // actually PAGE_SIZE
+        assert(len_to_top == PAGE_SIZE);
+    }
+
+    return len;
+}
+
+struct XiziPageManager xizi_pager = {
+    .new_pgdir = _new_pgdir,
+    .free_user_pgdir = _free_user_pgdir,
+    .map_pages = _map_user_pages,
+    .unmap_pages = _unmap_pages,
+
+    .resize_user_pgdir = _resize_user_pgdir,
+    .address_translate = _address_translate,
+    .cross_vspace_data_copy = _cross_vspace_data_copy,
+};
+
+bool module_pager_init(struct PagerRightGroup* _right_group)
+{
+    right_group = *_right_group;
+    _p_pgtbl_mmu_access = AchieveResource(&right_group.mmu_driver_tag);
+    return _p_pgtbl_mmu_access != NULL;
+}
+
+/// @brief kernel pagedir
+struct TopLevelPageDirectory kern_pgdir;
+
+void load_kern_pgdir(struct TraceTag* mmu_driver_tag, struct TraceTag* intr_driver_tag)
+{
+    if (mmu_driver_tag->meta == NULL) {
+        ERROR("Invalid mmu driver tag.\n");
+        return;
+    }
+
+    if (!_new_pgdir(&kern_pgdir)) {
+        panic("cannot alloc kernel page directory");
+    }
+    uintptr_t kern_attr = 0;
+    _p_pgtbl_mmu_access->MmuKernPteAttr(&kern_attr);
+    uintptr_t dev_attr = 0;
+    _p_pgtbl_mmu_access->MmuDevPteAttr(&dev_attr);
+
+    // kern mem
+    _map_pages((uintptr_t*)kern_pgdir.pd_addr, KERN_MEM_BASE, PHY_MEM_BASE, (PHY_MEM_STOP - PHY_MEM_BASE), kern_attr);
+    // dev mem
+    _map_pages((uintptr_t*)kern_pgdir.pd_addr, DEV_VRTMEM_BASE, DEV_PHYMEM_BASE, DEV_MEM_SIZE, dev_attr);
+
+    _p_pgtbl_mmu_access->LoadPgdir((uintptr_t)V2P(kern_pgdir.pd_addr));
+}
+
+void secondary_cpu_load_kern_pgdir(struct TraceTag* mmu_driver_tag, struct TraceTag* intr_driver_tag)
+{
+    _p_pgtbl_mmu_access->LoadPgdir((uintptr_t)V2P(kern_pgdir.pd_addr));
+}
\ No newline at end of file
diff --git a/Ubiquitous/XiZi_AIoT/softkernel/memory/pagetable_riscv_level3.c b/Ubiquitous/XiZi_AIoT/softkernel/memory/pagetable_riscv_level3.c
new file mode 100644
index 000000000..f9501b6f8
--- /dev/null
+++ b/Ubiquitous/XiZi_AIoT/softkernel/memory/pagetable_riscv_level3.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2020 AIIT XUOS Lab
+ * XiUOS is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *        http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+/**
+ * @file pagetable_level3.c
+ * @brief page walk and L2 pagetable
+ * @version 1.0
+ * @author AIIT XUOS Lab
+ * @date 2024.05.06
+ */
+
+/*************************************************
+File name: pagetable_level3.c
+Description: ok1028 image vector table
+Others:
+History:
+Author: AIIT XUOS Lab
+Modification:
+1. first version
+*************************************************/
+#include <stdint.h>
+
+#include "core.h"
+#include "memlayout.h"
+
+#include "assert.h"
+#include "buddy.h"
+#include "kalloc.h"
+#include "pagetable.h"
+
+uintptr_t* _page_walk(uintptr_t* pgdir, uintptr_t vaddr, bool alloc)
+{
+
+    // get page table addr
+    assert(pgdir != NULL);
+    uintptr_t pde_attr = 0;
+    _p_pgtbl_mmu_access->MmuPdeAttr(&pde_attr);
+
+    uintptr_t* l2_pde_ptr = (uintptr_t*)&pgdir[(vaddr >> LEVEL2_PDE_SHIFT) & (NUM_LEVEL2_PDE - 1)];
+
+    uintptr_t* l3_pde_vaddr;
+    if (*l2_pde_ptr != 0) {
+        uintptr_t l3_table_paddr = ALIGNDOWN(*l2_pde_ptr, PAGE_SIZE);
+        l3_pde_vaddr = (uintptr_t*)P2V(l3_table_paddr);
+    } else {
+        if (!alloc || !(l3_pde_vaddr = (uintptr_t*)kalloc(sizeof(uintptr_t) * NUM_LEVEL3_PDE))) {
+            return NULL;
+        }
+
+        memset(l3_pde_vaddr, 0, sizeof(uintptr_t) * NUM_LEVEL3_PDE);
+        *l2_pde_ptr = V2P(l3_pde_vaddr) | pde_attr;
+    }
+
+    uintptr_t* l3_pde_ptr = (uintptr_t*)&l3_pde_vaddr[(vaddr >> LEVEL3_PDE_SHIFT) & (NUM_LEVEL3_PDE - 1)];
+
+    uintptr_t* l4_pte_vaddr;
+    if (*l3_pde_ptr != 0) {
+        uintptr_t l4_table_paddr = ALIGNDOWN(*l3_pde_ptr, PAGE_SIZE);
+        l4_pte_vaddr = (uintptr_t*)P2V(l4_table_paddr);
+    } else {
+        if (!alloc || !(l4_pte_vaddr = (uintptr_t*)kalloc(sizeof(uintptr_t) * NUM_LEVEL4_PTE))) {
+            return NULL;
+        }
+
+        memset(l4_pte_vaddr, 0, sizeof(uintptr_t) * NUM_LEVEL4_PTE);
+        *l3_pde_ptr = V2P(l4_pte_vaddr) | pde_attr;
+    }
+
+    return &l4_pte_vaddr[LEVEL4_PTE_IDX(vaddr)];
+}
+
+void _free_user_pgdir(struct TopLevelPageDirectory* pgdir)
+{
+    if (pgdir->pd_addr == NULL) {
+        return;
+    }
+
+    uintptr_t end_idx = (USER_MEM_TOP >> LEVEL2_PDE_SHIFT) & (NUM_LEVEL2_PDE - 1);
+
+    for (uintptr_t l2_entry_idx = 0; l2_entry_idx < end_idx; l2_entry_idx++) {
+        // free each level3 page table
+        uintptr_t* l3_table_paddr = (uintptr_t*)ALIGNDOWN(pgdir->pd_addr[l2_entry_idx], PAGE_SIZE);
+        if (l3_table_paddr != NULL) {
+            uintptr_t* l3_table_vaddr = P2V(l3_table_paddr);
+            for (uintptr_t l3_entry_idx = 0; l3_entry_idx < NUM_LEVEL3_PDE; l3_entry_idx++) {
+                uintptr_t* l4_table_paddr = (uintptr_t*)LEVEL4_PTE_ADDR(l3_table_vaddr[l3_entry_idx]);
+                if (l4_table_paddr != NULL) {
+                    kfree(P2V(l4_table_paddr));
+                }
+            }
+            kfree(P2V(l3_table_paddr));
+        }
+    }
+    kfree((char*)pgdir->pd_addr);
+}