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add msr.h to v3

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Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

Acked-by: Stefan Reinauer <stepan@coresystems.de>


git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@335 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
Ronald G. Minnich 2007-05-24 20:33:46 +00:00
commit db83d17b19
1 changed files with 52 additions and 0 deletions
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include/arch/x86/msr.h Normal file
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/*
* This file is part of the LinuxBIOS project.
*
* Copyright (C) 2007 Ron Minnich
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef CPU_X86_MSR_H
#define CPU_X86_MSR_H
/* standard MSR operations, everyone has written these one hundred times */
typedef struct msr_struct
{
unsigned lo;
unsigned hi;
} msr_t;
static inline msr_t rdmsr(unsigned index)
{
msr_t result;
__asm__ __volatile__ (
"rdmsr"
: "=a" (result.lo), "=d" (result.hi)
: "c" (index)
);
return result;
}
static inline void wrmsr(unsigned index, msr_t msr)
{
__asm__ __volatile__ (
"wrmsr"
: /* No outputs */
: "c" (index), "a" (msr.lo), "d" (msr.hi)
);
}
#endif /* CPU_X86_MSR_H */