arch/x86_64/hal/msr.h


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#ifndef _JOVE_x86_64_HAL_MSR_H
#define _JOVE_x86_64_HAL_MSR_H 1

#include <stdint.h>

#define MSR_FS_BASE     0xC0000100
#define MSR_GS_BASE     0xC0000101
#define MSR_KGS_BASE    0xC0000102

#define MSR_EFER        0xC0000080
#define MSR_EFER_SCE 0b1

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

union msr_gs_base
{
    uintptr_t gs;
    uint32_t v[2];
};

union msr_star
{
    struct {
        uint32_t eip;
        uint16_t kcs;
        uint16_t ucs;
    };
    uint16_t v[2];
};

union msr_lstar
{
    void *rip;
    uint32_t v[2];
};

void msr_set_gs_base(uintptr_t gs_base);
uintptr_t msr_get_gs_base(void);

void msr_enable_sce(void);
void msr_enable_sse(void);

void msr_set_lstar(void *syscall_entry);

void msr_read(uint32_t msr, uint32_t *lo, uint32_t *hi);
void msr_write(uint32_t msr, uint32_t lo, uint32_t hi);

#endif