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1 | #------------------------------------------------------------------------------\r | |
2 | #\r | |
3 | # Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r | |
4 | # 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 | # ZeroMem.asm\r | |
15 | #\r | |
16 | # Abstract:\r | |
17 | #\r | |
18 | # ZeroMem function\r | |
19 | #\r | |
20 | # Notes:\r | |
21 | #\r | |
22 | #------------------------------------------------------------------------------\r | |
23 | \r | |
24 | ASM_GLOBAL ASM_PFX(InternalMemZeroMem)\r | |
25 | \r | |
26 | #------------------------------------------------------------------------------\r | |
27 | # VOID *\r | |
28 | # EFIAPI\r | |
29 | # InternalMemZeroMem (\r | |
30 | # IN VOID *Buffer,\r | |
31 | # IN UINTN Count\r | |
32 | # );\r | |
33 | #------------------------------------------------------------------------------\r | |
34 | ASM_PFX(InternalMemZeroMem):\r | |
35 | push %edi\r | |
36 | movl 8(%esp), %edi\r | |
37 | movl 12(%esp), %edx\r | |
38 | xorl %ecx, %ecx\r | |
39 | subl %edi, %ecx\r | |
40 | xorl %eax, %eax\r | |
41 | andl $15, %ecx\r | |
42 | jz L0\r | |
43 | cmpl %edx, %ecx\r | |
44 | cmova %edx, %ecx\r | |
45 | subl %ecx, %edx\r | |
46 | rep\r | |
47 | stosb\r | |
48 | L0:\r | |
49 | movl %edx, %ecx\r | |
50 | andl $15, %edx\r | |
51 | shrl $4, %ecx\r | |
52 | jz L_ZeroBytes\r | |
53 | pxor %xmm0, %xmm0\r | |
54 | L1:\r | |
55 | movntdq %xmm0, (%edi)\r | |
56 | addl $16, %edi\r | |
57 | loop L1\r | |
58 | mfence\r | |
59 | L_ZeroBytes:\r | |
60 | movl %edx, %ecx\r | |
61 | rep\r | |
62 | stosb\r | |
63 | movl 8(%esp), %eax\r | |
64 | pop %edi\r | |
65 | ret\r |