projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| c7f33ca4 | 1 | /*++\r |
| 2 | \r | |
| 4ea9375a HT |
3 | Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>\r |
| 4 | This program and the accompanying materials \r | |
| c7f33ca4 | 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 | EfiCopyMemRep4.c\r | |
| 15 | \r | |
| 16 | Abstract:\r | |
| 17 | \r | |
| 18 | This is the code that uses rep movsd CopyMem service\r | |
| 19 | \r | |
| 20 | --*/\r | |
| 21 | \r | |
| 22 | #include "Tiano.h"\r | |
| 23 | \r | |
| 24 | VOID\r | |
| 25 | EfiCommonLibCopyMem (\r | |
| 26 | IN VOID *Destination,\r | |
| 27 | IN VOID *Source,\r | |
| 28 | IN UINTN Count\r | |
| 29 | )\r | |
| 30 | /*++\r | |
| 31 | \r | |
| 32 | Routine Description:\r | |
| 33 | \r | |
| 34 | Copy Length bytes from Source to Destination.\r | |
| 35 | \r | |
| 36 | Arguments:\r | |
| 37 | \r | |
| 38 | Destination - Target of copy\r | |
| 39 | \r | |
| 40 | Source - Place to copy from\r | |
| 41 | \r | |
| 42 | Length - Number of bytes to copy\r | |
| 43 | \r | |
| 44 | Returns:\r | |
| 45 | \r | |
| 46 | None\r | |
| 47 | \r | |
| 48 | --*/\r | |
| 49 | {\r | |
| 50 | __asm {\r | |
| 51 | mov esi, Source ; esi <- Source\r | |
| 52 | mov edi, Destination ; edi <- Destination\r | |
| 53 | mov edx, Count ; edx <- Count\r | |
| 54 | cmp esi, edi\r | |
| 55 | je _CopyDone\r | |
| 56 | cmp edx, 0\r | |
| 57 | je _CopyDone\r | |
| 58 | lea eax, [esi + edx - 1] ; eax <- End of Source\r | |
| 59 | cmp esi, edi\r | |
| 60 | jae _CopyDWord\r | |
| 61 | cmp eax, edi\r | |
| 62 | jae _CopyBackward ; Copy backward if overlapped\r | |
| 63 | _CopyDWord:\r | |
| 64 | mov ecx, edx\r | |
| 65 | and edx, 3\r | |
| 66 | shr ecx, 2\r | |
| 67 | rep movsd ; Copy as many Dwords as possible\r | |
| 68 | jmp _CopyBytes\r | |
| 69 | _CopyBackward:\r | |
| 70 | mov esi, eax ; esi <- End of Source\r | |
| 71 | lea edi, [edi + edx - 1] ; edi <- End of Destination\r | |
| 72 | std\r | |
| 73 | _CopyBytes:\r | |
| 74 | mov ecx, edx\r | |
| 75 | rep movsb ; Copy bytes backward\r | |
| 76 | cld\r | |
| 77 | _CopyDone:\r | |
| 78 | }\r | |
| 7ccf38a3 | 79 | }\r |