projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| b1ff428c | 1 | #\r |
| 2 | # ConvertAsm.py: Automatically generated from CopyMem.asm\r | |
| 3 | #\r | |
| 4 | #------------------------------------------------------------------------------\r | |
| 5 | #\r | |
| c33c6476 HT |
6 | # Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r |
| 7 | # This program and the accompanying materials\r | |
| b1ff428c | 8 | # are licensed and made available under the terms and conditions of the BSD License\r |
| 9 | # which accompanies this distribution. The full text of the license may be found at\r | |
| 10 | # http://opensource.org/licenses/bsd-license.php\r | |
| 11 | #\r | |
| 12 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 13 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 14 | #\r | |
| 15 | # Module Name:\r | |
| 16 | #\r | |
| 17 | # CopyMem.S\r | |
| 18 | #\r | |
| 19 | # Abstract:\r | |
| 20 | #\r | |
| 21 | # CopyMem function\r | |
| 22 | #\r | |
| 23 | # Notes:\r | |
| 24 | #\r | |
| 25 | #------------------------------------------------------------------------------\r | |
| 26 | \r | |
| 27 | \r | |
| 28 | #------------------------------------------------------------------------------\r | |
| 29 | # VOID *\r | |
| 30 | # EFIAPI\r | |
| 31 | # InternalMemCopyMem (\r | |
| 32 | # IN VOID *Destination,\r | |
| 33 | # IN VOID *Source,\r | |
| 34 | # IN UINTN Count\r | |
| 35 | # )\r | |
| 36 | #------------------------------------------------------------------------------\r | |
| 132f41f0 | 37 | ASM_GLOBAL ASM_PFX(InternalMemCopyMem)\r |
| b1ff428c | 38 | ASM_PFX(InternalMemCopyMem):\r |
| 1fef058f | 39 | pushq %rsi\r |
| 40 | pushq %rdi\r | |
| 41 | movq %rdx, %rsi # rsi <- Source\r | |
| 42 | movq %rcx, %rdi # rdi <- Destination\r | |
| 43 | leaq -1(%rsi, %r8,), %r9 # r9 <- Last byte of Source\r | |
| 44 | cmpq %rdi, %rsi\r | |
| 45 | movq %rdi, %rax # rax <- Destination as return value\r | |
| b1ff428c | 46 | jae L0 # Copy forward if Source > Destination\r |
| 1fef058f | 47 | cmpq %rdi, %r9 # Overlapped?\r |
| b1ff428c | 48 | jae L_CopyBackward # Copy backward if overlapped\r |
| 49 | L0: \r | |
| 1fef058f | 50 | xorq %rcx, %rcx \r |
| 51 | subq %rdi, %rcx # rcx <- -rdi\r | |
| 52 | andq $15, %rcx # rcx + rsi should be 16 bytes aligned\r | |
| b1ff428c | 53 | jz L1 # skip if rcx == 0\r |
| 1fef058f | 54 | cmpq %r8, %rcx\r |
| 55 | cmova %r8, %rcx\r | |
| 56 | subq %rcx, %r8\r | |
| b1ff428c | 57 | rep movsb\r |
| 58 | L1:\r | |
| 1fef058f | 59 | movq %r8, %rcx\r |
| 60 | andq $15, %r8\r | |
| 61 | shrq $4, %rcx # rcx <- # of DQwords to copy\r | |
| b1ff428c | 62 | jz L_CopyBytes\r |
| 1fef058f | 63 | movdqa %xmm0, 0x18(%rsp) # save xmm0 on stack\r |
| b1ff428c | 64 | L2:\r |
| 1fef058f | 65 | movdqu (%rsi), %xmm0 # rsi may not be 16-byte aligned\r |
| 66 | movntdq %xmm0, (%rdi) # rdi should be 16-byte aligned\r | |
| 67 | addq $16, %rsi\r | |
| 68 | addq $16, %rdi\r | |
| b1ff428c | 69 | loop L2\r |
| 70 | mfence\r | |
| 1fef058f | 71 | movdqa 0x18(%rsp), %xmm0 # restore xmm0\r |
| b1ff428c | 72 | jmp L_CopyBytes # copy remaining bytes\r |
| 73 | L_CopyBackward:\r | |
| 1fef058f | 74 | movq %r9, %rsi # rsi <- Last byte of Source\r |
| 75 | leaq -1(%rdi, %r8,), %rdi # rdi <- Last byte of Destination\r | |
| b1ff428c | 76 | std\r |
| 77 | L_CopyBytes:\r | |
| 1fef058f | 78 | movq %r8, %rcx\r |
| b1ff428c | 79 | rep movsb\r |
| 80 | cld\r | |
| 1fef058f | 81 | popq %rdi\r |
| 82 | popq %rsi\r | |
| b1ff428c | 83 | ret\r |