;------------------------------------------------------------------------------ | |
; | |
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> | |
; SPDX-License-Identifier: BSD-2-Clause-Patent | |
; | |
; Module Name: | |
; | |
; ReadMsr64.Asm | |
; | |
; Abstract: | |
; | |
; AsmReadMsr64 function | |
; | |
; Notes: | |
; | |
;------------------------------------------------------------------------------ | |
DEFAULT REL | |
SECTION .text | |
;------------------------------------------------------------------------------ | |
; UINT64 | |
; EFIAPI | |
; AsmReadMsr64 ( | |
; IN UINT32 Index | |
; ); | |
;------------------------------------------------------------------------------ | |
global ASM_PFX(AsmReadMsr64) | |
ASM_PFX(AsmReadMsr64): | |
rdmsr ; edx & eax are zero extended | |
shl rdx, 0x20 | |
or rax, rdx | |
ret | |