audk/MdePkg/Library/BaseLib/X64/ReadMsr64.asm

41 lines
1.2 KiB
NASM

;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php.
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
; ReadMsr64.Asm
;
; Abstract:
;
; AsmReadMsr64 function
;
; Notes:
;
;------------------------------------------------------------------------------
.code
;------------------------------------------------------------------------------
; UINT64
; EFIAPI
; AsmReadMsr64 (
; IN UINT32 Index
; );
;------------------------------------------------------------------------------
AsmReadMsr64 PROC
rdmsr ; edx & eax are zero extended
shl rdx, 20h
or rax, rdx
ret
AsmReadMsr64 ENDP
END