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1 | ;------------------------------------------------------------------------------\r |
2 | ;\r |
3 | ; Copyright (c) 2006, Intel Corporation\r |
4 | ; All rights reserved. This program and the accompanying materials\r |
5 | ; are licensed and made available under the terms and conditions of the BSD License\r |
6 | ; which accompanies this distribution. The full text of the license may be found at\r |
7 | ; http://opensource.org/licenses/bsd-license.php\r |
8 | ;\r |
9 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
10 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
11 | ;\r |
12 | ; Module Name:\r |
13 | ;\r |
14 | ; CompareMem.Asm\r |
15 | ;\r |
16 | ; Abstract:\r |
17 | ;\r |
18 | ; CompareMem function\r |
19 | ;\r |
20 | ; Notes:\r |
21 | ;\r |
22 | ; The following BaseMemoryLib instances share the same version of this file:\r |
23 | ;\r |
24 | ; BaseMemoryLibRepStr\r |
25 | ; BaseMemoryLibMmx\r |
26 | ; BaseMemoryLibSse2\r |
27 | ;\r |
28 | ;------------------------------------------------------------------------------\r |
29 | \r |
30 | .code\r |
31 | \r |
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32 | ;------------------------------------------------------------------------------\r |
33 | ; INTN\r |
34 | ; EFIAPI\r |
35 | ; InternalMemCompareMem (\r |
36 | ; IN CONST VOID *DestinationBuffer,\r |
37 | ; IN CONST VOID *SourceBuffer,\r |
38 | ; IN UINTN Length\r |
39 | ; );\r |
40 | ;------------------------------------------------------------------------------\r |
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41 | InternalMemCompareMem PROC USES rsi rdi\r |
42 | mov rsi, rcx\r |
43 | mov rdi, rdx\r |
44 | mov rcx, r8\r |
45 | repe cmpsb\r |
46 | movzx rax, byte ptr [rsi - 1]\r |
47 | movzx rdx, byte ptr [rdi - 1]\r |
48 | sub rax, rdx\r |
49 | ret\r |
50 | InternalMemCompareMem ENDP\r |
51 | \r |
52 | END\r |