1#------------------------------------------------------------------------------ 2# 3# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR> 4# This program and the accompanying materials 5# are licensed and made available under the terms and conditions of the BSD License 6# which accompanies this distribution. The full text of the license may be found at 7# http://opensource.org/licenses/bsd-license.php 8# 9# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11# 12# Module Name: 13# 14# ReadMsr64.S 15# 16# Abstract: 17# 18# AsmReadMsr64 function 19# 20# Notes: 21# 22#------------------------------------------------------------------------------ 23 24#include <EdkIIGlueBase.h> 25#------------------------------------------------------------------------------ 26# UINT64 27# EFIAPI 28# AsmReadMsr64 ( 29# IN UINT32 Index 30# ); 31#------------------------------------------------------------------------------ 32.globl ASM_PFX(AsmReadMsr64) 33ASM_PFX(AsmReadMsr64): 34 rdmsr # edx & eax are zero extended 35 shl $0x20, %rdx 36 or %rdx, %rax 37 ret 38