include/arch/x86_64/msr.h


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#ifndef _JOVE_x86_64_MSR_H
#define _JOVE_x86_64_MSR_H 1

#include <stddef.h>
#include <stdint.h>

#define MSR_EFER 0xC0000080
#define MSR_STAR 0xC0000081
#define MSR_LSTAR 0xC0000082
#define MSR_SFMASK 0xC0000084

#define MSR_FSBASE 0xC0000100
#define MSR_GSBASE 0xC0000101
#define MSR_KERNELGSBASE 0xC0000102

typedef union msr_efer
{
    struct {
        uint8_t sce : 1;
        uint8_t resv : 7;
        uint8_t lme : 1;
        uint8_t unk0 : 1;
        uint8_t lma : 1;
        uint8_t nxe : 1;
        uint8_t svme : 1;
        uint8_t lmsle : 1;
        uint8_t ffxsr : 1;
        uint8_t tce : 1;
    };
    uint32_t v[2];
} msr_efer_t;

typedef union msr_star
{
    struct {
        uint32_t eip;
        uint16_t kcs;
        uint16_t ucs;
    };
    uint32_t v[2];
} msr_star_t;
typedef uintptr_t msr_lstar_t;

void msr_efer_write(msr_efer_t v);
msr_efer_t msr_efer_read(void);

void msr_star_write(msr_star_t v);
msr_star_t msr_star_read(void);

void msr_lstar_write(msr_lstar_t v);
msr_lstar_t msr_lstar_read(void);

void msr_gsbase_write(uintptr_t gsbase);
uintptr_t msr_gsbase_read(void);

#endif