[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / EnableCache.asm

;------------------------------------------------------------------------------\r
;\r
; Copyright (c) 2006 - 2008, Intel Corporation\r
; All rights reserved. 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
;   EnableCache.Asm\r
;\r
; Abstract:\r
;\r
;  Flush all caches with a WBINVD instruction, clear the CD bit of CR0 to 0, and clear \r
;  the NW bit of CR0 to 0\r
;\r
; Notes:\r
;\r
;------------------------------------------------------------------------------\r
\r
    .code\r
\r
;------------------------------------------------------------------------------\r
; VOID\r
; EFIAPI\r
; AsmEnableCache (\r
;   VOID\r
;   );\r
;------------------------------------------------------------------------------\r
AsmEnableCache PROC\r
    wbinvd\r
    mov     rax, cr0\r
    btr     rax, 29\r
    btr     rax, 30\r
    mov     cr0, rax\r
    ret\r
AsmEnableCache ENDP\r
\r
    END\r
Commit	Line	Data
9f4f2f0e	1	;------------------------------------------------------------------------------\r
9f4f2f0e	2	;\r
373ade0e	3	; Copyright (c) 2006 - 2008, Intel Corporation\r
9f4f2f0e	4	; All rights reserved. This program and the accompanying materials\r
	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	; EnableCache.Asm\r
	15	;\r
	16	; Abstract:\r
	17	;\r
	18	; Flush all caches with a WBINVD instruction, clear the CD bit of CR0 to 0, and clear \r
	19	; the NW bit of CR0 to 0\r
	20	;\r
	21	; Notes:\r
	22	;\r
	23	;------------------------------------------------------------------------------\r
	24	\r
	25	.code\r
	26	\r
	27	;------------------------------------------------------------------------------\r
	28	; VOID\r
	29	; EFIAPI\r
	30	; AsmEnableCache (\r
	31	; VOID\r
	32	; );\r
	33	;------------------------------------------------------------------------------\r
	34	AsmEnableCache PROC\r
	35	wbinvd\r
	36	mov rax, cr0\r
	37	btr rax, 29\r
	38	btr rax, 30\r
	39	mov cr0, rax\r
	40	ret\r
	41	AsmEnableCache ENDP\r
	42	\r
	43	END\r