projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 8b247ef7 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 |
| 8b247ef7 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 | mov rcx, rdx\r | |
| 33 | mov r8, rdi\r | |
| 34 | and edx, 7\r | |
| 35 | shr rcx, 3\r | |
| 36 | jz @ZeroBytes\r | |
| 37 | DB 0xf, 0xef, 0xc0 ; pxor mm0, mm0\r | |
| 38 | .0:\r | |
| 39 | DB 0xf, 0xe7, 7 ; movntq [rdi], mm0\r | |
| 40 | add rdi, 8\r | |
| 41 | loop .0\r | |
| 42 | DB 0xf, 0xae, 0xf0 ; mfence\r | |
| 43 | @ZeroBytes:\r | |
| 44 | xor eax, eax\r | |
| 45 | mov ecx, edx\r | |
| 46 | rep stosb\r | |
| 47 | mov rax, r8\r | |
| 48 | pop rdi\r | |
| 49 | ret\r | |
| 50 | \r |