+++ /dev/null
-;------------------------------------------------------------------------------\r
-;\r
-; Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>\r
-; This program and the accompanying materials\r
-; are licensed and made available under the terms and conditions of the BSD License\r
-; which accompanies this distribution. The full text of the license may be found at\r
-; http://opensource.org/licenses/bsd-license.php\r
-;\r
-; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
-; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
-;\r
-; Module Name:\r
-;\r
-; SetMem.asm\r
-;\r
-; Abstract:\r
-;\r
-; memset function\r
-;\r
-; Notes:\r
-;\r
-;------------------------------------------------------------------------------\r
-\r
- .code\r
-\r
-;------------------------------------------------------------------------------\r
-; VOID *\r
-; memset (\r
-; OUT VOID *Buffer, --> rcx\r
-; IN UINT8 Value, --> rdx\r
-; IN UINTN Length --> r8\r
-; );\r
-;------------------------------------------------------------------------------\r
-memset PROC USES rdi\r
- mov rax, rcx \r
- cmp r8, 0 ; if Size == 0, do nothing\r
- je @SetDone \r
- mov rax, rdx ; rdx <-> r8\r
- mov rdx, r8 ; rdx <- Length\r
- mov r8, rax ; r8 <- Value\r
- \r
- mov rdi, rcx ; rdi <- Buffer\r
- mov al, r8b ; al <- Value\r
- mov r9, rdi ; r9 <- Buffer as return value\r
- xor rcx, rcx\r
- sub rcx, rdi\r
- and rcx, 15 ; rcx + rdi aligns on 16-byte boundary\r
- jz @F\r
- cmp rcx, rdx\r
- cmova rcx, rdx\r
- sub rdx, rcx\r
- rep stosb\r
-@@:\r
- mov rcx, rdx\r
- and rdx, 15\r
- shr rcx, 4\r
- jz @SetBytes\r
- mov ah, al ; ax <- Value repeats twice\r
- movd xmm0, eax ; xmm0[0..16] <- Value repeats twice\r
- pshuflw xmm0, xmm0, 0 ; xmm0[0..63] <- Value repeats 8 times\r
- movlhps xmm0, xmm0 ; xmm0 <- Value repeats 16 times\r
-@@:\r
- movdqa [rdi], xmm0 ; rdi should be 16-byte aligned\r
- add rdi, 16\r
- loop @B\r
-@SetBytes:\r
- mov ecx, edx ; high 32 bits of rcx are always zero\r
- rep stosb\r
- mov rax, r9 ; rax <- Return value\r
-@SetDone:\r
- ret\r
-memset ENDP\r
-\r
- END\r