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e1f414b6 | 1 | /** @file\r |
2 | Architecture Independent Base Memory Library Implementation.\r | |
3 | \r | |
d531bfee | 4 | The following BaseMemoryLib instances contain the same copy of this file:\r |
5 | BaseMemoryLib\r | |
6 | PeiMemoryLib\r | |
1fef058f | 7 | UefiMemoryLib\r |
d531bfee | 8 | \r |
1944b02b | 9 | Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r |
9344f092 | 10 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
e1f414b6 | 11 | \r |
e1f414b6 | 12 | **/\r |
13 | \r | |
e1f414b6 | 14 | #include "MemLibInternals.h"\r |
15 | \r | |
16 | /**\r | |
17 | Fills a target buffer with a 16-bit value, and returns the target buffer.\r | |
18 | \r | |
15c952e7 | 19 | @param Buffer The pointer to the target buffer to fill.\r |
20 | @param Length The count of 16-bit value to fill.\r | |
21 | @param Value The value with which to fill Length bytes of Buffer.\r | |
e1f414b6 | 22 | \r |
23 | @return Buffer\r | |
24 | \r | |
25 | **/\r | |
26 | VOID *\r | |
27 | EFIAPI\r | |
28 | InternalMemSetMem16 (\r | |
29 | OUT VOID *Buffer,\r | |
30 | IN UINTN Length,\r | |
31 | IN UINT16 Value\r | |
32 | )\r | |
33 | {\r | |
9088c61e HW |
34 | for (; Length != 0; Length--) {\r |
35 | ((UINT16*)Buffer)[Length - 1] = Value;\r | |
36 | }\r | |
e1f414b6 | 37 | return Buffer;\r |
38 | }\r | |
39 | \r | |
40 | /**\r | |
41 | Fills a target buffer with a 32-bit value, and returns the target buffer.\r | |
42 | \r | |
15c952e7 | 43 | @param Buffer The pointer to the target buffer to fill.\r |
44 | @param Length The count of 32-bit value to fill.\r | |
45 | @param Value The value with which to fill Length bytes of Buffer.\r | |
e1f414b6 | 46 | \r |
47 | @return Buffer\r | |
48 | \r | |
49 | **/\r | |
50 | VOID *\r | |
51 | EFIAPI\r | |
52 | InternalMemSetMem32 (\r | |
53 | OUT VOID *Buffer,\r | |
54 | IN UINTN Length,\r | |
55 | IN UINT32 Value\r | |
56 | )\r | |
57 | {\r | |
9088c61e HW |
58 | for (; Length != 0; Length--) {\r |
59 | ((UINT32*)Buffer)[Length - 1] = Value;\r | |
60 | }\r | |
e1f414b6 | 61 | return Buffer;\r |
62 | }\r | |
63 | \r | |
64 | /**\r | |
65 | Fills a target buffer with a 64-bit value, and returns the target buffer.\r | |
66 | \r | |
15c952e7 | 67 | @param Buffer The pointer to the target buffer to fill.\r |
68 | @param Length The count of 64-bit value to fill.\r | |
69 | @param Value The value with which to fill Length bytes of Buffer.\r | |
e1f414b6 | 70 | \r |
71 | @return Buffer\r | |
72 | \r | |
73 | **/\r | |
74 | VOID *\r | |
75 | EFIAPI\r | |
76 | InternalMemSetMem64 (\r | |
77 | OUT VOID *Buffer,\r | |
78 | IN UINTN Length,\r | |
79 | IN UINT64 Value\r | |
80 | )\r | |
81 | {\r | |
9088c61e HW |
82 | for (; Length != 0; Length--) {\r |
83 | ((UINT64*)Buffer)[Length - 1] = Value;\r | |
84 | }\r | |
e1f414b6 | 85 | return Buffer;\r |
86 | }\r | |
87 | \r | |
88 | /**\r | |
89 | Set Buffer to 0 for Size bytes.\r | |
90 | \r | |
91 | @param Buffer Memory to set.\r | |
2fc59a00 | 92 | @param Length The number of bytes to set.\r |
e1f414b6 | 93 | \r |
94 | @return Buffer\r | |
95 | \r | |
96 | **/\r | |
97 | VOID *\r | |
98 | EFIAPI\r | |
99 | InternalMemZeroMem (\r | |
100 | OUT VOID *Buffer,\r | |
101 | IN UINTN Length\r | |
102 | )\r | |
103 | {\r | |
104 | return InternalMemSetMem (Buffer, Length, 0);\r | |
105 | }\r | |
106 | \r | |
107 | /**\r | |
108 | Compares two memory buffers of a given length.\r | |
109 | \r | |
15c952e7 | 110 | @param DestinationBuffer The first memory buffer.\r |
111 | @param SourceBuffer The second memory buffer.\r | |
e1f414b6 | 112 | @param Length Length of DestinationBuffer and SourceBuffer memory\r |
113 | regions to compare. Must be non-zero.\r | |
114 | \r | |
d531bfee | 115 | @return 0 All Length bytes of the two buffers are identical.\r |
116 | @retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first\r | |
117 | mismatched byte in DestinationBuffer.\r | |
e1f414b6 | 118 | \r |
119 | **/\r | |
120 | INTN\r | |
121 | EFIAPI\r | |
122 | InternalMemCompareMem (\r | |
123 | IN CONST VOID *DestinationBuffer,\r | |
124 | IN CONST VOID *SourceBuffer,\r | |
125 | IN UINTN Length\r | |
126 | )\r | |
127 | {\r | |
128 | while ((--Length != 0) &&\r | |
129 | (*(INT8*)DestinationBuffer == *(INT8*)SourceBuffer)) {\r | |
130 | DestinationBuffer = (INT8*)DestinationBuffer + 1;\r | |
131 | SourceBuffer = (INT8*)SourceBuffer + 1;\r | |
132 | }\r | |
133 | return (INTN)*(UINT8*)DestinationBuffer - (INTN)*(UINT8*)SourceBuffer;\r | |
134 | }\r | |
135 | \r | |
136 | /**\r | |
137 | Scans a target buffer for an 8-bit value, and returns a pointer to the\r | |
138 | matching 8-bit value in the target buffer.\r | |
139 | \r | |
15c952e7 | 140 | @param Buffer The pointer to the target buffer to scan.\r |
141 | @param Length The count of 8-bit value to scan. Must be non-zero.\r | |
142 | @param Value The value to search for in the target buffer.\r | |
e1f414b6 | 143 | \r |
15c952e7 | 144 | @return The pointer to the first occurrence, or NULL if not found.\r |
e1f414b6 | 145 | \r |
146 | **/\r | |
147 | CONST VOID *\r | |
148 | EFIAPI\r | |
149 | InternalMemScanMem8 (\r | |
150 | IN CONST VOID *Buffer,\r | |
151 | IN UINTN Length,\r | |
152 | IN UINT8 Value\r | |
153 | )\r | |
154 | {\r | |
155 | CONST UINT8 *Pointer;\r | |
156 | \r | |
157 | Pointer = (CONST UINT8*)Buffer;\r | |
158 | do {\r | |
af072124 | 159 | if (*Pointer == Value) {\r |
160 | return Pointer;\r | |
e1f414b6 | 161 | }\r |
af072124 | 162 | ++Pointer;\r |
e1f414b6 | 163 | } while (--Length != 0);\r |
164 | return NULL;\r | |
165 | }\r | |
166 | \r | |
167 | /**\r | |
168 | Scans a target buffer for a 16-bit value, and returns a pointer to the\r | |
169 | matching 16-bit value in the target buffer.\r | |
170 | \r | |
15c952e7 | 171 | @param Buffer The pointer to the target buffer to scan.\r |
172 | @param Length The count of 16-bit value to scan. Must be non-zero.\r | |
173 | @param Value The value to search for in the target buffer.\r | |
e1f414b6 | 174 | \r |
15c952e7 | 175 | @return The pointer to the first occurrence, or NULL if not found.\r |
e1f414b6 | 176 | \r |
177 | **/\r | |
178 | CONST VOID *\r | |
179 | EFIAPI\r | |
180 | InternalMemScanMem16 (\r | |
181 | IN CONST VOID *Buffer,\r | |
182 | IN UINTN Length,\r | |
183 | IN UINT16 Value\r | |
184 | )\r | |
185 | {\r | |
186 | CONST UINT16 *Pointer;\r | |
187 | \r | |
188 | Pointer = (CONST UINT16*)Buffer;\r | |
189 | do {\r | |
af072124 | 190 | if (*Pointer == Value) {\r |
191 | return Pointer;\r | |
e1f414b6 | 192 | }\r |
af072124 | 193 | ++Pointer;\r |
e1f414b6 | 194 | } while (--Length != 0);\r |
195 | return NULL;\r | |
196 | }\r | |
197 | \r | |
198 | /**\r | |
199 | Scans a target buffer for a 32-bit value, and returns a pointer to the\r | |
200 | matching 32-bit value in the target buffer.\r | |
201 | \r | |
15c952e7 | 202 | @param Buffer The pointer to the target buffer to scan.\r |
203 | @param Length The count of 32-bit value to scan. Must be non-zero.\r | |
204 | @param Value The value to search for in the target buffer.\r | |
e1f414b6 | 205 | \r |
15c952e7 | 206 | @return The pointer to the first occurrence, or NULL if not found.\r |
e1f414b6 | 207 | \r |
208 | **/\r | |
209 | CONST VOID *\r | |
210 | EFIAPI\r | |
211 | InternalMemScanMem32 (\r | |
212 | IN CONST VOID *Buffer,\r | |
213 | IN UINTN Length,\r | |
214 | IN UINT32 Value\r | |
215 | )\r | |
216 | {\r | |
217 | CONST UINT32 *Pointer;\r | |
218 | \r | |
219 | Pointer = (CONST UINT32*)Buffer;\r | |
220 | do {\r | |
af072124 | 221 | if (*Pointer == Value) {\r |
222 | return Pointer;\r | |
e1f414b6 | 223 | }\r |
af072124 | 224 | ++Pointer;\r |
e1f414b6 | 225 | } while (--Length != 0);\r |
226 | return NULL;\r | |
227 | }\r | |
228 | \r | |
229 | /**\r | |
230 | Scans a target buffer for a 64-bit value, and returns a pointer to the\r | |
231 | matching 64-bit value in the target buffer.\r | |
232 | \r | |
15c952e7 | 233 | @param Buffer The pointer to the target buffer to scan.\r |
234 | @param Length The count of 64-bit value to scan. Must be non-zero.\r | |
235 | @param Value The value to search for in the target buffer.\r | |
e1f414b6 | 236 | \r |
15c952e7 | 237 | @return The pointer to the first occurrence, or NULL if not found.\r |
e1f414b6 | 238 | \r |
239 | **/\r | |
240 | CONST VOID *\r | |
241 | EFIAPI\r | |
242 | InternalMemScanMem64 (\r | |
243 | IN CONST VOID *Buffer,\r | |
244 | IN UINTN Length,\r | |
245 | IN UINT64 Value\r | |
246 | )\r | |
247 | {\r | |
248 | CONST UINT64 *Pointer;\r | |
249 | \r | |
250 | Pointer = (CONST UINT64*)Buffer;\r | |
251 | do {\r | |
af072124 | 252 | if (*Pointer == Value) {\r |
253 | return Pointer;\r | |
e1f414b6 | 254 | }\r |
af072124 | 255 | ++Pointer;\r |
e1f414b6 | 256 | } while (--Length != 0);\r |
257 | return NULL;\r | |
258 | }\r | |
1944b02b HW |
259 | \r |
260 | /**\r | |
261 | Checks whether the contents of a buffer are all zeros.\r | |
262 | \r | |
263 | @param Buffer The pointer to the buffer to be checked.\r | |
264 | @param Length The size of the buffer (in bytes) to be checked.\r | |
265 | \r | |
266 | @retval TRUE Contents of the buffer are all zeros.\r | |
267 | @retval FALSE Contents of the buffer are not all zeros.\r | |
268 | \r | |
269 | **/\r | |
270 | BOOLEAN\r | |
271 | EFIAPI\r | |
272 | InternalMemIsZeroBuffer (\r | |
273 | IN CONST VOID *Buffer,\r | |
274 | IN UINTN Length\r | |
275 | )\r | |
276 | {\r | |
277 | CONST UINT8 *BufferData;\r | |
278 | UINTN Index;\r | |
279 | \r | |
280 | BufferData = Buffer;\r | |
281 | for (Index = 0; Index < Length; Index++) {\r | |
282 | if (BufferData[Index] != 0) {\r | |
283 | return FALSE;\r | |
284 | }\r | |
285 | }\r | |
286 | return TRUE;\r | |
287 | }\r |