From db83d17b195ccd71530204f75cb730525f2fb9c1 Mon Sep 17 00:00:00 2001 From: "Ronald G. Minnich" Date: Thu, 24 May 2007 20:33:46 +0000 Subject: [PATCH] add msr.h to v3 Signed-off-by: Ronald G. Minnich Acked-by: Stefan Reinauer git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@335 f3766cd6-281f-0410-b1cd-43a5c92072e9 --- include/arch/x86/msr.h | 52 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 include/arch/x86/msr.h diff --git a/include/arch/x86/msr.h b/include/arch/x86/msr.h new file mode 100644 index 0000000000..98eb0df4cd --- /dev/null +++ b/include/arch/x86/msr.h @@ -0,0 +1,52 @@ +/* + * 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 */