projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| b341712e | 1 | #------------------------------------------------------------------------------\r |
| 2 | #\r | |
| 2c7e5c2f HT |
3 | # Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r |
| 4 | # This program and the accompanying materials\r | |
| b341712e | 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 | # CopyMem.Asm\r | |
| 15 | #\r | |
| 16 | # Abstract:\r | |
| 17 | #\r | |
| 18 | # CopyMem function\r | |
| 19 | #\r | |
| 20 | # Notes:\r | |
| 21 | #\r | |
| 22 | #------------------------------------------------------------------------------\r | |
| 23 | #include <EdkIIGlueBase.h>\r | |
| 24 | .globl ASM_PFX(InternalMemCopyMem)\r | |
| 25 | \r | |
| 26 | #------------------------------------------------------------------------------\r | |
| 27 | # VOID *\r | |
| 28 | # EFIAPI\r | |
| 29 | # InternalMemCopyMem (\r | |
| 30 | # IN VOID *Destination,\r | |
| 31 | # IN VOID *Source,\r | |
| 32 | # IN UINTN Count\r | |
| 33 | # );\r | |
| 34 | #------------------------------------------------------------------------------\r | |
| 35 | ASM_PFX(InternalMemCopyMem):\r | |
| 36 | push %esi\r | |
| 37 | push %edi\r | |
| 38 | movl 16(%esp), %esi # esi <- Source\r | |
| 39 | movl 12(%esp), %edi # edi <- Destination\r | |
| 40 | movl 20(%esp), %edx # edx <- Count\r | |
| 41 | leal -1(%esi, %edx), %eax # eax <- End of Source\r | |
| 42 | cmpl %edi, %esi\r | |
| 43 | jae L0\r | |
| 44 | cmpl %edi, %eax\r | |
| 45 | jae L_CopyBackward # Copy backward if overlapped\r | |
| 46 | L0:\r | |
| 47 | movl %edx, %ecx\r | |
| 48 | andl $3, %edx\r | |
| 49 | shrl $2, %ecx\r | |
| 50 | rep\r | |
| 51 | movsl # Copy as many Dwords as possible\r | |
| 52 | jmp L_CopyBytes\r | |
| 53 | L_CopyBackward:\r | |
| 54 | movl %eax, %esi # esi <- End of Source\r | |
| 55 | leal -1(%edi, %edx), %edi # edi <- End of Destination\r | |
| 56 | std\r | |
| 57 | L_CopyBytes:\r | |
| 58 | movl %edx, %ecx\r | |
| 59 | rep\r | |
| 60 | movsb # Copy bytes backward\r | |
| 61 | cld\r | |
| 62 | movl 12(%esp), %eax # eax <- Destination as return value\r | |
| 63 | pop %edi\r | |
| 64 | pop %esi\r | |
| 65 | ret\r |