]>
Commit | Line | Data |
---|---|---|
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 |
2fcf0abf | 10 | This program and the accompanying materials\r |
e1f414b6 | 11 | are licensed and made available under the terms and conditions of the BSD License\r |
12 | which accompanies this distribution. The full text of the license may be found at\r | |
15c952e7 | 13 | http://opensource.org/licenses/bsd-license.php.\r |
e1f414b6 | 14 | \r |
15 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
16 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
17 | \r | |
e1f414b6 | 18 | **/\r |
19 | \r | |
e1f414b6 | 20 | #include "MemLibInternals.h"\r |
21 | \r | |
22 | /**\r | |
23 | Fills a target buffer with a 16-bit value, and returns the target buffer.\r | |
24 | \r | |
15c952e7 | 25 | @param Buffer The pointer to the target buffer to fill.\r |
26 | @param Length The count of 16-bit value to fill.\r | |
27 | @param Value The value with which to fill Length bytes of Buffer.\r | |
e1f414b6 | 28 | \r |
29 | @return Buffer\r | |
30 | \r | |
31 | **/\r | |
32 | VOID *\r | |
33 | EFIAPI\r | |
34 | InternalMemSetMem16 (\r | |
35 | OUT VOID *Buffer,\r | |
36 | IN UINTN Length,\r | |
37 | IN UINT16 Value\r | |
38 | )\r | |
39 | {\r | |
9088c61e HW |
40 | for (; Length != 0; Length--) {\r |
41 | ((UINT16*)Buffer)[Length - 1] = Value;\r | |
42 | }\r | |
e1f414b6 | 43 | return Buffer;\r |
44 | }\r | |
45 | \r | |
46 | /**\r | |
47 | Fills a target buffer with a 32-bit value, and returns the target buffer.\r | |
48 | \r | |
15c952e7 | 49 | @param Buffer The pointer to the target buffer to fill.\r |
50 | @param Length The count of 32-bit value to fill.\r | |
51 | @param Value The value with which to fill Length bytes of Buffer.\r | |
e1f414b6 | 52 | \r |
53 | @return Buffer\r | |
54 | \r | |
55 | **/\r | |
56 | VOID *\r | |
57 | EFIAPI\r | |
58 | InternalMemSetMem32 (\r | |
59 | OUT VOID *Buffer,\r | |
60 | IN UINTN Length,\r | |
61 | IN UINT32 Value\r | |
62 | )\r | |
63 | {\r | |
9088c61e HW |
64 | for (; Length != 0; Length--) {\r |
65 | ((UINT32*)Buffer)[Length - 1] = Value;\r | |
66 | }\r | |
e1f414b6 | 67 | return Buffer;\r |
68 | }\r | |
69 | \r | |
70 | /**\r | |
71 | Fills a target buffer with a 64-bit value, and returns the target buffer.\r | |
72 | \r | |
15c952e7 | 73 | @param Buffer The pointer to the target buffer to fill.\r |
74 | @param Length The count of 64-bit value to fill.\r | |
75 | @param Value The value with which to fill Length bytes of Buffer.\r | |
e1f414b6 | 76 | \r |
77 | @return Buffer\r | |
78 | \r | |
79 | **/\r | |
80 | VOID *\r | |
81 | EFIAPI\r | |
82 | InternalMemSetMem64 (\r | |
83 | OUT VOID *Buffer,\r | |
84 | IN UINTN Length,\r | |
85 | IN UINT64 Value\r | |
86 | )\r | |
87 | {\r | |
9088c61e HW |
88 | for (; Length != 0; Length--) {\r |
89 | ((UINT64*)Buffer)[Length - 1] = Value;\r | |
90 | }\r | |
e1f414b6 | 91 | return Buffer;\r |
92 | }\r | |
93 | \r | |
94 | /**\r | |
95 | Set Buffer to 0 for Size bytes.\r | |
96 | \r | |
97 | @param Buffer Memory to set.\r | |
2fc59a00 | 98 | @param Length The number of bytes to set.\r |
e1f414b6 | 99 | \r |
100 | @return Buffer\r | |
101 | \r | |
102 | **/\r | |
103 | VOID *\r | |
104 | EFIAPI\r | |
105 | InternalMemZeroMem (\r | |
106 | OUT VOID *Buffer,\r | |
107 | IN UINTN Length\r | |
108 | )\r | |
109 | {\r | |
110 | return InternalMemSetMem (Buffer, Length, 0);\r | |
111 | }\r | |
112 | \r | |
113 | /**\r | |
114 | Compares two memory buffers of a given length.\r | |
115 | \r | |
15c952e7 | 116 | @param DestinationBuffer The first memory buffer.\r |
117 | @param SourceBuffer The second memory buffer.\r | |
e1f414b6 | 118 | @param Length Length of DestinationBuffer and SourceBuffer memory\r |
119 | regions to compare. Must be non-zero.\r | |
120 | \r | |
d531bfee | 121 | @return 0 All Length bytes of the two buffers are identical.\r |
122 | @retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first\r | |
123 | mismatched byte in DestinationBuffer.\r | |
e1f414b6 | 124 | \r |
125 | **/\r | |
126 | INTN\r | |
127 | EFIAPI\r | |
128 | InternalMemCompareMem (\r | |
129 | IN CONST VOID *DestinationBuffer,\r | |
130 | IN CONST VOID *SourceBuffer,\r | |
131 | IN UINTN Length\r | |
132 | )\r | |
133 | {\r | |
134 | while ((--Length != 0) &&\r | |
135 | (*(INT8*)DestinationBuffer == *(INT8*)SourceBuffer)) {\r | |
136 | DestinationBuffer = (INT8*)DestinationBuffer + 1;\r | |
137 | SourceBuffer = (INT8*)SourceBuffer + 1;\r | |
138 | }\r | |
139 | return (INTN)*(UINT8*)DestinationBuffer - (INTN)*(UINT8*)SourceBuffer;\r | |
140 | }\r | |
141 | \r | |
142 | /**\r | |
143 | Scans a target buffer for an 8-bit value, and returns a pointer to the\r | |
144 | matching 8-bit value in the target buffer.\r | |
145 | \r | |
15c952e7 | 146 | @param Buffer The pointer to the target buffer to scan.\r |
147 | @param Length The count of 8-bit value to scan. Must be non-zero.\r | |
148 | @param Value The value to search for in the target buffer.\r | |
e1f414b6 | 149 | \r |
15c952e7 | 150 | @return The pointer to the first occurrence, or NULL if not found.\r |
e1f414b6 | 151 | \r |
152 | **/\r | |
153 | CONST VOID *\r | |
154 | EFIAPI\r | |
155 | InternalMemScanMem8 (\r | |
156 | IN CONST VOID *Buffer,\r | |
157 | IN UINTN Length,\r | |
158 | IN UINT8 Value\r | |
159 | )\r | |
160 | {\r | |
161 | CONST UINT8 *Pointer;\r | |
162 | \r | |
163 | Pointer = (CONST UINT8*)Buffer;\r | |
164 | do {\r | |
af072124 | 165 | if (*Pointer == Value) {\r |
166 | return Pointer;\r | |
e1f414b6 | 167 | }\r |
af072124 | 168 | ++Pointer;\r |
e1f414b6 | 169 | } while (--Length != 0);\r |
170 | return NULL;\r | |
171 | }\r | |
172 | \r | |
173 | /**\r | |
174 | Scans a target buffer for a 16-bit value, and returns a pointer to the\r | |
175 | matching 16-bit value in the target buffer.\r | |
176 | \r | |
15c952e7 | 177 | @param Buffer The pointer to the target buffer to scan.\r |
178 | @param Length The count of 16-bit value to scan. Must be non-zero.\r | |
179 | @param Value The value to search for in the target buffer.\r | |
e1f414b6 | 180 | \r |
15c952e7 | 181 | @return The pointer to the first occurrence, or NULL if not found.\r |
e1f414b6 | 182 | \r |
183 | **/\r | |
184 | CONST VOID *\r | |
185 | EFIAPI\r | |
186 | InternalMemScanMem16 (\r | |
187 | IN CONST VOID *Buffer,\r | |
188 | IN UINTN Length,\r | |
189 | IN UINT16 Value\r | |
190 | )\r | |
191 | {\r | |
192 | CONST UINT16 *Pointer;\r | |
193 | \r | |
194 | Pointer = (CONST UINT16*)Buffer;\r | |
195 | do {\r | |
af072124 | 196 | if (*Pointer == Value) {\r |
197 | return Pointer;\r | |
e1f414b6 | 198 | }\r |
af072124 | 199 | ++Pointer;\r |
e1f414b6 | 200 | } while (--Length != 0);\r |
201 | return NULL;\r | |
202 | }\r | |
203 | \r | |
204 | /**\r | |
205 | Scans a target buffer for a 32-bit value, and returns a pointer to the\r | |
206 | matching 32-bit value in the target buffer.\r | |
207 | \r | |
15c952e7 | 208 | @param Buffer The pointer to the target buffer to scan.\r |
209 | @param Length The count of 32-bit value to scan. Must be non-zero.\r | |
210 | @param Value The value to search for in the target buffer.\r | |
e1f414b6 | 211 | \r |
15c952e7 | 212 | @return The pointer to the first occurrence, or NULL if not found.\r |
e1f414b6 | 213 | \r |
214 | **/\r | |
215 | CONST VOID *\r | |
216 | EFIAPI\r | |
217 | InternalMemScanMem32 (\r | |
218 | IN CONST VOID *Buffer,\r | |
219 | IN UINTN Length,\r | |
220 | IN UINT32 Value\r | |
221 | )\r | |
222 | {\r | |
223 | CONST UINT32 *Pointer;\r | |
224 | \r | |
225 | Pointer = (CONST UINT32*)Buffer;\r | |
226 | do {\r | |
af072124 | 227 | if (*Pointer == Value) {\r |
228 | return Pointer;\r | |
e1f414b6 | 229 | }\r |
af072124 | 230 | ++Pointer;\r |
e1f414b6 | 231 | } while (--Length != 0);\r |
232 | return NULL;\r | |
233 | }\r | |
234 | \r | |
235 | /**\r | |
236 | Scans a target buffer for a 64-bit value, and returns a pointer to the\r | |
237 | matching 64-bit value in the target buffer.\r | |
238 | \r | |
15c952e7 | 239 | @param Buffer The pointer to the target buffer to scan.\r |
240 | @param Length The count of 64-bit value to scan. Must be non-zero.\r | |
241 | @param Value The value to search for in the target buffer.\r | |
e1f414b6 | 242 | \r |
15c952e7 | 243 | @return The pointer to the first occurrence, or NULL if not found.\r |
e1f414b6 | 244 | \r |
245 | **/\r | |
246 | CONST VOID *\r | |
247 | EFIAPI\r | |
248 | InternalMemScanMem64 (\r | |
249 | IN CONST VOID *Buffer,\r | |
250 | IN UINTN Length,\r | |
251 | IN UINT64 Value\r | |
252 | )\r | |
253 | {\r | |
254 | CONST UINT64 *Pointer;\r | |
255 | \r | |
256 | Pointer = (CONST UINT64*)Buffer;\r | |
257 | do {\r | |
af072124 | 258 | if (*Pointer == Value) {\r |
259 | return Pointer;\r | |
e1f414b6 | 260 | }\r |
af072124 | 261 | ++Pointer;\r |
e1f414b6 | 262 | } while (--Length != 0);\r |
263 | return NULL;\r | |
264 | }\r | |
1944b02b HW |
265 | \r |
266 | /**\r | |
267 | Checks whether the contents of a buffer are all zeros.\r | |
268 | \r | |
269 | @param Buffer The pointer to the buffer to be checked.\r | |
270 | @param Length The size of the buffer (in bytes) to be checked.\r | |
271 | \r | |
272 | @retval TRUE Contents of the buffer are all zeros.\r | |
273 | @retval FALSE Contents of the buffer are not all zeros.\r | |
274 | \r | |
275 | **/\r | |
276 | BOOLEAN\r | |
277 | EFIAPI\r | |
278 | InternalMemIsZeroBuffer (\r | |
279 | IN CONST VOID *Buffer,\r | |
280 | IN UINTN Length\r | |
281 | )\r | |
282 | {\r | |
283 | CONST UINT8 *BufferData;\r | |
284 | UINTN Index;\r | |
285 | \r | |
286 | BufferData = Buffer;\r | |
287 | for (Index = 0; Index < Length; Index++) {\r | |
288 | if (BufferData[Index] != 0) {\r | |
289 | return FALSE;\r | |
290 | }\r | |
291 | }\r | |
292 | return TRUE;\r | |
293 | }\r |