First commit XiUOS

applications/user_api/switch_api/user_mem.c

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+/*
+ * 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:    user_mem.c
+* @brief:   the priviate user api of mem for application 
+* @version: 1.0
+* @author:  AIIT XUOS Lab
+* @date:    2020/4/20
+*
+*/
+
+#include "user_api.h"
+#include <string.h>
+
+/**
+ * This function is provided to allocate memory block.
+ *
+ * @param size the memory size to be allocated
+ *
+ * @return pointer on success; NULL on failure
+ */
+void *UserMalloc(size_t size){
+  return  (void *)(KSwitch1(KS_USER_MALLOC,(uintptr_t)size));
+}
+
+/**
+ * This function is provided to release memory block.
+ *
+ * @param pointer the memory to be released
+ */
+void UserFree(void *pointer){
+    KSwitch1(KS_USER_FREE,(uintptr_t)pointer);
+    return;
+}
+
+/**
+ * This function is provided to re-allocate memory block.
+ *
+ * @param pointer the old memory pointer
+ * @param size the memory size to be re-allocated
+ *
+ * @return pointer on success; NULL on failure
+ */
+void *UserRealloc(void *pointer, size_t size){
+    x_size_t newsize = 0;
+	  x_size_t oldsize = 0;
+	  void *newmem = NONE;
+
+	  /* the given pointer is NULL */
+	  if (pointer == NONE)
+		  return UserMalloc(size);
+
+    /* parameter detection */
+	  if (size == 0) {
+		  UserFree(pointer);
+		  return NONE;
+	  }
+
+	  /* allocate new memory */
+	  newmem = UserMalloc(size);
+	  if(newmem == NONE) {
+        return NONE;
+	  }
+
+	  /* copy the old memory and then release old memory pointer */
+	  memcpy((char*)newmem, (char*) pointer,size > oldsize ? oldsize : size);
+	  UserFree(pointer);
+
+	  return newmem;
+}
+
+/**
+ * This function will allocate memory blocks and then clear the memory.
+ *
+ * @param count the number of memory blocks
+ * @param size the size of a memory block
+ *
+ * @return pointer on success; NULL on failure
+ */
+void *UserCalloc(size_t count, size_t size){
+    void *p = NONE;
+
+    /* calls x_malloc to allocate count * size memory */
+	  p = UserMalloc(count * size);
+
+	  /* zero the memory */
+	  if (p)
+		  memset((char*)p, 0, count * size);
+
+	  return p;
+}
+
+