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;
; Copyright (c) 2006-2008 Advanced Micro Devices,Inc. ("AMD").
;
; This library is free software; you can redistribute it and/or modify
; it under the terms of the GNU Lesser General Public License as
; published by the Free Software Foundation; either version 2.1 of the
; License, or (at your option) any later version.
;
; This code is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; Lesser General Public License for more details.
;
; You should have received a copy of the GNU Lesser General
; Public License along with this library; if not, write to the
; Free Software Foundation, Inc., 59 Temple Place, Suite 330,
; Boston, MA 02111-1307 USA
;
;* Function:
;* This file implements routines to access MSRs.
.model tiny,c
.586p
.CODE
;************************************************************************
; Returns the low dword of the specified MSR
;************************************************************************
Read_MSR_LO proc pascal \
MSR_Addr: dword
mov ecx, [MSR_Addr]
rdmsr
mov edx, eax
shr edx, 16
ret
Read_MSR_LO endp
;************************************************************************
; Writes the low dword of the specified MSR
;************************************************************************
Write_MSR_LO proc pascal \
MSR_Addr: dword, \
MSR_Data: dword
mov ecx, [MSR_Addr]
rdmsr
mov eax, [MSR_Data]
wrmsr
ret
Write_MSR_LO endp
;***********************************************************************
; Returns an MSR value in a buffer.
; Usage: Read_MSR(ULONG Msr, ULONG * Buffer);
;***********************************************************************
Read_MSR proc pascal \
MSR_Addr:DWORD, \
pMSR_Data:PTR DWORD
mov ecx, [MSR_Addr]
rdmsr
mov bx, [pMSR_Data]
mov dword ptr [bx+0], eax
mov dword ptr [bx+4], edx
ret
Read_MSR endp
;***********************************************************************
; Writes an MSR.
; Usage: Write_MSR(ULONG Msr, ULONG * Buffer);
;***********************************************************************
Write_MSR proc pascal \
MSR_Addr:DWORD, \
pMSR_Data:PTR DWORD
mov ecx, [MSR_Addr]
mov bx, [pMSR_Data]
mov eax, dword ptr [bx+0]
mov edx, dword ptr [bx+4]
wrmsr
ret
Write_MSR endp
END
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