;------------------------------------------------------------------------------ | |
; | |
; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> | |
; SPDX-License-Identifier: BSD-2-Clause-Patent | |
; | |
; Module Name: | |
; | |
; DisableCache.Asm | |
; | |
; Abstract: | |
; | |
; Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a | |
; WBINVD instruction. | |
; | |
; Notes: | |
; | |
;------------------------------------------------------------------------------ | |
DEFAULT REL | |
SECTION .text | |
;------------------------------------------------------------------------------ | |
; VOID | |
; EFIAPI | |
; AsmDisableCache ( | |
; VOID | |
; ); | |
;------------------------------------------------------------------------------ | |
global ASM_PFX(AsmDisableCache) | |
ASM_PFX(AsmDisableCache): | |
mov rax, cr0 | |
bts rax, 30 | |
btr rax, 29 | |
mov cr0, rax | |
wbinvd | |
ret | |