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ebefee1b JJ |
1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
3 | ; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r | |
9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
ebefee1b JJ |
5 | ;\r |
6 | ; Module Name:\r | |
7 | ;\r | |
8 | ; CompareMem.Asm\r | |
9 | ;\r | |
10 | ; Abstract:\r | |
11 | ;\r | |
12 | ; CompareMem function\r | |
13 | ;\r | |
14 | ; Notes:\r | |
15 | ;\r | |
16 | ; The following BaseMemoryLib instances contain the same copy of this file:\r | |
17 | ;\r | |
18 | ; BaseMemoryLibRepStr\r | |
19 | ; BaseMemoryLibMmx\r | |
20 | ; BaseMemoryLibSse2\r | |
21 | ; BaseMemoryLibOptDxe\r | |
22 | ; BaseMemoryLibOptPei\r | |
23 | ;\r | |
24 | ;------------------------------------------------------------------------------\r | |
25 | \r | |
26 | DEFAULT REL\r | |
27 | SECTION .text\r | |
28 | \r | |
29 | ;------------------------------------------------------------------------------\r | |
30 | ; INTN\r | |
31 | ; EFIAPI\r | |
32 | ; InternalMemCompareMem (\r | |
33 | ; IN CONST VOID *DestinationBuffer,\r | |
34 | ; IN CONST VOID *SourceBuffer,\r | |
35 | ; IN UINTN Length\r | |
36 | ; );\r | |
37 | ;------------------------------------------------------------------------------\r | |
38 | global ASM_PFX(InternalMemCompareMem)\r | |
39 | ASM_PFX(InternalMemCompareMem):\r | |
40 | push rsi\r | |
41 | push 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 [rsi - 1]\r | |
47 | movzx rdx, byte [rdi - 1]\r | |
48 | sub rax, rdx\r | |
49 | pop rdi\r | |
50 | pop rsi\r | |
51 | ret\r | |
52 | \r |