projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3eb9473e | 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 | |
| 3eb9473e | 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 | ; SetMem.asm\r | |
| 15 | ;\r | |
| 16 | ; Abstract:\r | |
| 17 | ;\r | |
| 18 | ; memset function\r | |
| 19 | ;\r | |
| 20 | ; Notes:\r | |
| 21 | ;\r | |
| 22 | ;------------------------------------------------------------------------------\r | |
| 23 | \r | |
| 24 | .code\r | |
| 25 | \r | |
| 26 | ;------------------------------------------------------------------------------\r | |
| 27 | ; VOID *\r | |
| 28 | ; memset (\r | |
| 29 | ; OUT VOID *Buffer, --> rcx\r | |
| 30 | ; IN UINT8 Value, --> rdx\r | |
| 31 | ; IN UINTN Length --> r8\r | |
| 32 | ; );\r | |
| 33 | ;------------------------------------------------------------------------------\r | |
| 34 | memset PROC USES rdi\r | |
| 35 | mov rax, rcx \r | |
| 36 | cmp r8, 0 ; if Size == 0, do nothing\r | |
| 37 | je @SetDone \r | |
| 38 | mov rax, rdx ; rdx <-> r8\r | |
| 39 | mov rdx, r8 ; rdx <- Length\r | |
| 40 | mov r8, rax ; r8 <- Value\r | |
| 41 | \r | |
| 42 | mov rdi, rcx ; rdi <- Buffer\r | |
| 43 | mov al, r8b ; al <- Value\r | |
| 44 | mov r9, rdi ; r9 <- Buffer as return value\r | |
| 45 | xor rcx, rcx\r | |
| 46 | sub rcx, rdi\r | |
| 47 | and rcx, 15 ; rcx + rdi aligns on 16-byte boundary\r | |
| 48 | jz @F\r | |
| 49 | cmp rcx, rdx\r | |
| 50 | cmova rcx, rdx\r | |
| 51 | sub rdx, rcx\r | |
| 52 | rep stosb\r | |
| 53 | @@:\r | |
| 54 | mov rcx, rdx\r | |
| 55 | and rdx, 15\r | |
| 56 | shr rcx, 4\r | |
| 57 | jz @SetBytes\r | |
| 58 | mov ah, al ; ax <- Value repeats twice\r | |
| 59 | movd xmm0, eax ; xmm0[0..16] <- Value repeats twice\r | |
| 60 | pshuflw xmm0, xmm0, 0 ; xmm0[0..63] <- Value repeats 8 times\r | |
| 61 | movlhps xmm0, xmm0 ; xmm0 <- Value repeats 16 times\r | |
| 62 | @@:\r | |
| 63 | movdqa [rdi], xmm0 ; rdi should be 16-byte aligned\r | |
| 64 | add rdi, 16\r | |
| 65 | loop @B\r | |
| 66 | @SetBytes:\r | |
| 67 | mov ecx, edx ; high 32 bits of rcx are always zero\r | |
| 68 | rep stosb\r | |
| 69 | mov rax, r9 ; rax <- Return value\r | |
| 70 | @SetDone:\r | |
| 71 | ret\r | |
| 72 | memset ENDP\r | |
| 73 | \r | |
| 74 | END\r |