[mirror_edk2.git] / EdkCompatibilityPkg / Foundation / Library / EdkIIGlueLib / Library / BaseLib / X64 / WriteMsr64.asm

; Copyright (c) 2004, 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
;   WriteMsr64.Asm\r
;\r
; Abstract:\r
;\r
;   AsmWriteMsr64 function\r
;\r
; Notes:\r
;\r
;------------------------------------------------------------------------------\r
\r
    .code\r
\r
;------------------------------------------------------------------------------\r
; UINT64\r
; EFIAPI\r
; AsmWriteMsr64 (\r
;   IN UINT32  Index,\r
;   IN UINT64  Value\r
;   );\r
;------------------------------------------------------------------------------\r
AsmWriteMsr64   PROC\r
    mov     rax, rdx                    ; meanwhile, rax <- return value\r
    shr     rdx, 20h                    ; edx:eax contains the value to write\r
    wrmsr\r
    ret\r
AsmWriteMsr64   ENDP\r
\r
    END\r
Commit	Line	Data
3eb9473e	1	; Copyright (c) 2004, Intel Corporation \r
	2	; All rights reserved. This program and the accompanying materials \r
	3	; are licensed and made available under the terms and conditions of the BSD License \r
	4	; which accompanies this distribution. The full text of the license may be found at \r
	5	; http://opensource.org/licenses/bsd-license.php \r
	6	; \r
	7	; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
	8	; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
	9	;\r
	10	; Module Name:\r
	11	;\r
	12	; WriteMsr64.Asm\r
	13	;\r
	14	; Abstract:\r
	15	;\r
	16	; AsmWriteMsr64 function\r
	17	;\r
	18	; Notes:\r
	19	;\r
	20	;------------------------------------------------------------------------------\r
	21	\r
	22	.code\r
	23	\r
	24	;------------------------------------------------------------------------------\r
	25	; UINT64\r
	26	; EFIAPI\r
	27	; AsmWriteMsr64 (\r
	28	; IN UINT32 Index,\r
	29	; IN UINT64 Value\r
	30	; );\r
	31	;------------------------------------------------------------------------------\r
	32	AsmWriteMsr64 PROC\r
	33	mov rax, rdx ; meanwhile, rax <- return value\r
	34	shr rdx, 20h ; edx:eax contains the value to write\r
	35	wrmsr\r
	36	ret\r
	37	AsmWriteMsr64 ENDP\r
	38	\r
	39	END\r