1 /*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 * conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 * of conditions and the following disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 * to endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "stdlib.h"
33 #include "string.h"
34 #include "los_vm_map.h"
35
36 /*
37 * Allocates the requested memory and returns a pointer to it. The requested
38 * size is nitems each size bytes long (total memory requested is nitems*size).
39 * The space is initialized to all zero bits.
40 */
41
calloc(size_t nitems,size_t size)42 void *calloc(size_t nitems, size_t size)
43 {
44 size_t real_size;
45 void *ptr = NULL;
46
47 if (nitems == 0 || size == 0) {
48 return NULL;
49 }
50
51 real_size = (size_t)(nitems * size);
52 ptr = LOS_KernelMalloc((UINT32) real_size);
53 if (ptr != NULL) {
54 (void) memset_s((void *) ptr, real_size, 0, real_size);
55 }
56 return ptr;
57 }
58
59 /*
60 * Deallocates the memory previously allocated by a call to calloc, malloc, or
61 * realloc. The argument ptr points to the space that was previously allocated.
62 * If ptr points to a memory block that was not allocated with calloc, malloc,
63 * or realloc, or is a space that has been deallocated, then the result is undefined.
64 */
65
free(void * ptr)66 void free(void *ptr)
67 {
68 if (ptr == NULL) {
69 return;
70 }
71
72 LOS_KernelFree(ptr);
73 }
74
75 /*
76 * Allocates the requested memory and returns a pointer to it. The requested
77 * size is size bytes. The value of the space is indeterminate.
78 */
79
malloc(size_t size)80 void *malloc(size_t size)
81 {
82 if (size == 0) {
83 return NULL;
84 }
85
86 return LOS_KernelMalloc((UINT32) size);
87 }
88
zalloc(size_t size)89 void *zalloc(size_t size)
90 {
91 void *ptr = NULL;
92
93 if (size == 0) {
94 return NULL;
95 }
96
97 ptr = LOS_KernelMalloc((UINT32) size);
98 if (ptr != NULL) {
99 (void) memset_s(ptr, size, 0, size);
100 }
101 return ptr;
102 }
103
104 /*
105 * allocates a block of size bytes whose address is a multiple of boundary.
106 * The boundary must be a power of two!
107 */
108
memalign(size_t boundary,size_t size)109 void *memalign(size_t boundary, size_t size)
110 {
111 if (size == 0) {
112 return NULL;
113 }
114
115 return LOS_KernelMallocAlign((UINT32) size, (UINT32) boundary);
116 }
117
118 /*
119 * Attempts to resize the memory block pointed to by ptr that was previously
120 * allocated with a call to malloc or calloc. The contents pointed to by ptr are
121 * unchanged. If the value of size is greater than the previous size of the
122 * block, then the additional bytes have an undeterminate value. If the value
123 * of size is less than the previous size of the block, then the difference of
124 * bytes at the end of the block are freed. If ptr is null, then it behaves like
125 * malloc. If ptr points to a memory block that was not allocated with calloc
126 * or malloc, or is a space that has been deallocated, then the result is
127 * undefined. If the new space cannot be allocated, then the contents pointed
128 * to by ptr are unchanged. If size is zero, then the memory block is completely
129 * freed.
130 */
131
realloc(void * ptr,size_t size)132 void *realloc(void *ptr, size_t size)
133 {
134 if (ptr == NULL) {
135 ptr = malloc(size);
136 return ptr;
137 }
138
139 if (size == 0) {
140 free(ptr);
141 return NULL;
142 }
143
144 return LOS_KernelRealloc(ptr, (UINT32) size);
145 }
146