97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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* Copyright (c) 2013, 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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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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#ifdef __cplusplus
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extern "C" {
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#endif
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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 !defined(__is_sortix_libk) && !defined(__is_sortix_kernel)
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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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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif
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#endif
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