msr.c

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#include "msr.h"
 
void write_msr(uint32_t msr, uint64_t value) {
    asm volatile(
        "wrmsr" ::
        "a"(value & 0xFFFFFFFF), "d"((value >> 32) & 0xFFFFFFFF), "c"(msr)
    );
}
 
uint64_t read_msr(uint32_t msr) {
    uint64_t lo, hi;
    asm volatile(
        "rdmsr"            :
        "=a"(lo), "=d"(hi) :
        "c"(msr)
    ); 
 
    return (hi << 32) | lo;
}