arch/x86_64/msr.c


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#include "arch/x86_64/msr.h"

void
msr_write(uint32_t msr, uint64_t v)
{
    __asm__ volatile("wrmsr":: "a"(v), "d"(v >> 32), "c"(msr));
}

uint64_t
msr_read(uint32_t msr)
{
    uint32_t lo, hi;
    __asm__ volatile("rdmsr": "=a"(lo), "=d"(hi): "c"(msr));
    uint64_t v = hi;
    v = (v << 32) | lo;
    return v;
}

void 
msr_efer_write(msr_efer_t v)
{
    msr_write(MSR_EFER, *((uintptr_t*)&v));
}

msr_efer_t 
msr_efer_read(void)
{
    uint64_t rawv = msr_read(MSR_EFER);
    return *((msr_efer_t*)&rawv);
}

void 
msr_star_write(msr_star_t v)
{
    msr_write(MSR_STAR, *((uintptr_t*)&v));
}

msr_star_t 
msr_star_read(void)
{
    uint64_t rawv = msr_read(MSR_STAR);
    return *((msr_star_t*)&rawv);
}

void 
msr_lstar_write(msr_lstar_t v)
{
    msr_write(MSR_LSTAR, v);
}

msr_lstar_t 
msr_lstar_read(void)
{
    return msr_read(MSR_LSTAR);
}

void
msr_gsbase_write(uintptr_t gsbase)
{
    msr_write(MSR_GSBASE, gsbase);
}

uintptr_t
msr_gsbase_read(void)
{
    return msr_read(MSR_GSBASE);
}