projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 41a275ba JJ |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 3 | ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r | |
| 9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 41a275ba JJ |
5 | ;\r |
| 6 | ; Module Name:\r | |
| 7 | ;\r | |
| 8 | ; ZeroMem.nasm\r | |
| 9 | ;\r | |
| 10 | ; Abstract:\r | |
| 11 | ;\r | |
| 12 | ; ZeroMem function\r | |
| 13 | ;\r | |
| 14 | ; Notes:\r | |
| 15 | ;\r | |
| 16 | ;------------------------------------------------------------------------------\r | |
| 17 | \r | |
| 18 | DEFAULT REL\r | |
| 19 | SECTION .text\r | |
| 20 | \r | |
| 21 | ;------------------------------------------------------------------------------\r | |
| 22 | ; VOID *\r | |
| 23 | ; InternalMemZeroMem (\r | |
| 24 | ; IN VOID *Buffer,\r | |
| 25 | ; IN UINTN Count\r | |
| 26 | ; )\r | |
| 27 | ;------------------------------------------------------------------------------\r | |
| 28 | global ASM_PFX(InternalMemZeroMem)\r | |
| 29 | ASM_PFX(InternalMemZeroMem):\r | |
| 30 | push rdi\r | |
| 31 | mov rdi, rcx\r | |
| 32 | xor rcx, rcx\r | |
| 33 | xor eax, eax\r | |
| 34 | sub rcx, rdi\r | |
| 35 | and rcx, 15\r | |
| 36 | mov r8, rdi\r | |
| 37 | jz .0\r | |
| 38 | cmp rcx, rdx\r | |
| 39 | cmova rcx, rdx\r | |
| 40 | sub rdx, rcx\r | |
| 41 | rep stosb\r | |
| 42 | .0:\r | |
| 43 | mov rcx, rdx\r | |
| 44 | and edx, 15\r | |
| 45 | shr rcx, 4\r | |
| 46 | jz @ZeroBytes\r | |
| 47 | pxor xmm0, xmm0\r | |
| 48 | .1:\r | |
| 49 | movntdq [rdi], xmm0 ; rdi should be 16-byte aligned\r | |
| 50 | add rdi, 16\r | |
| 51 | loop .1\r | |
| 52 | mfence\r | |
| 53 | @ZeroBytes:\r | |
| 54 | mov ecx, edx\r | |
| 55 | rep stosb\r | |
| 56 | mov rax, r8\r | |
| 57 | pop rdi\r | |
| 58 | ret\r | |
| 59 | \r |