98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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msr.h
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High-level access to the rdmsr and wrmsr instructions for accessing and
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modifying machine specific registers.
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*******************************************************************************/
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#ifndef INCLUDE_MSR_H
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#define INCLUDE_MSR_H
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#include <sys/cdefs.h>
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#include <stdint.h>
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#if defined(__i386__) || defined(__x86_64__)
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__BEGIN_DECLS
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#define MSRID_FSBASE __UINT32_C(0xC0000100)
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#define MSRID_GSBASE __UINT32_C(0xC0000101)
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__attribute__((unused))
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static __inline uint64_t rdmsr_instruction(uint32_t msrid)
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{
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uint32_t low;
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uint32_t high;
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__asm__ __volatile__ ("rdmsr" : "=a"(low), "=d"(high) : "c"(msrid));
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return (uint64_t) low << 0 | (uint64_t) high << 32;
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}
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__attribute__((unused))
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static __inline uint64_t wrmsr_instruction(uint32_t msrid, uint64_t value)
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{
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uint32_t low = value >> 0 & 0xFFFFFFFF;
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uint32_t high = value >> 32 & 0xFFFFFFFF;
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__asm__ __volatile__ ("wrmsr" : : "a"(low), "d"(high), "c"(msrid) : "memory");
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return value;
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}
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#if __STDC_HOSTED__
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uint64_t rdmsr(uint32_t msrid);
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uint64_t wrmsr(uint32_t msrid, uint64_t value);
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#else
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__attribute__((unused))
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static __inline uint64_t rdmsr(uint32_t msrid)
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{
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return rdmsr_instruction(msrid);
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}
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__attribute__((unused))
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static __inline uint64_t wrmsr(uint32_t msrid, uint64_t value)
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{
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return wrmsr_instruction(msrid, value);
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}
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#endif
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__attribute__((unused))
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static __inline void rdmsr_split(uint32_t msrid, uint32_t* low, uint32_t* high)
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{
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uint64_t result = rdmsr(msrid);
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*low = result >> 0 & 0xFFFFFFFF;
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*high = result >> 32 & 0xFFFFFFFF;
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}
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__attribute__((unused))
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static __inline void wrmsr_split(uint32_t msrid, uint32_t low, uint32_t high)
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{
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wrmsr(msrid, (uint64_t) low << 0 | (uint64_t) high << 32);
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}
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__END_DECLS
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#endif
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#endif
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