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631f060b | 1 | #------------------------------------------------------------------------------ |
2 | # | |
3 | # Copyright (c) 2006, Intel Corporation | |
4 | # All rights reserved. This program and the accompanying materials | |
5 | # are licensed and made available under the terms and conditions of the BSD License | |
6 | # which accompanies this distribution. The full text of the license may be found at | |
7 | # http://opensource.org/licenses/bsd-license.php | |
8 | # | |
9 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
10 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
11 | # | |
12 | # Module Name: | |
13 | # | |
14 | # CopyMem.asm | |
15 | # | |
16 | # Abstract: | |
17 | # | |
18 | # CopyMem function | |
19 | # | |
20 | # Notes: | |
21 | # | |
22 | #------------------------------------------------------------------------------ | |
23 | ||
85c25283 | 24 | .globl ASM_PFX(InternalMemCopyMem) |
631f060b | 25 | |
26 | #------------------------------------------------------------------------------ | |
27 | # VOID * | |
28 | # EFIAPI | |
29 | # InternalMemCopyMem ( | |
30 | # IN VOID *Destination, | |
31 | # IN VOID *Source, | |
32 | # IN UINTN Count | |
33 | # ); | |
34 | #------------------------------------------------------------------------------ | |
85c25283 | 35 | ASM_PFX(InternalMemCopyMem): |
631f060b | 36 | push %esi |
37 | push %edi | |
38 | movl 16(%esp), %esi # esi <- Source | |
39 | movl 12(%esp), %edi # edi <- Destination | |
40 | movl 20(%esp), %edx # edx <- Count | |
41 | leal -1(%esi,%edx,), %eax # eax <- End of Source | |
42 | cmpl %edi, %esi | |
43 | jae L0 | |
44 | cmpl %edi, %eax # Overlapped? | |
45 | jae L_CopyBackward # Copy backward if overlapped | |
46 | L0: | |
47 | xorl %ecx, %ecx | |
48 | subl %edi, %ecx | |
49 | andl $15, %ecx # ecx + edi aligns on 16-byte boundary | |
50 | jz L1 | |
51 | cmpl %edx, %ecx | |
52 | cmova %edx, %ecx | |
53 | subl %ecx, %edx # edx <- remaining bytes to copy | |
54 | rep | |
55 | movsb | |
56 | L1: | |
57 | movl %edx, %ecx | |
58 | andl $15, %edx | |
59 | shrl $4, %ecx # ecx <- # of DQwords to copy | |
60 | jz L_CopyBytes | |
61 | addl $-16, %esp | |
62 | movdqu %xmm0, (%esp) | |
63 | L2: | |
64 | movdqu (%esi), %xmm0 | |
65 | movntdq %xmm0, (%edi) | |
66 | addl $16, %esi | |
67 | addl $16, %edi | |
68 | loop L2 | |
69 | mfence | |
70 | movdqu (%esp),%xmm0 | |
71 | addl $16, %esp # stack cleanup | |
72 | jmp L_CopyBytes | |
73 | L_CopyBackward: | |
74 | movl %eax, %esi # esi <- Last byte in Source | |
75 | leal -1(%edi,%edx,), %edi # edi <- Last byte in Destination | |
76 | std | |
77 | L_CopyBytes: | |
78 | movl %edx, %ecx | |
79 | rep | |
80 | movsb | |
81 | cld | |
82 | movl 12(%esp), %eax # eax <- Destination as return value | |
83 | pop %edi | |
84 | pop %esi | |
85 | ret |