tss.h

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#pragma once
 
#include <kernel/cpu/stack_pointer.h>
 
#include <kernel/defs.h>
#include <stdint.h>
 
typedef enum
{
    TSS_IST_NONE = 0,
    TSS_IST1 = 1,
    TSS_IST2 = 2,
    TSS_IST3 = 3,
    TSS_IST4 = 4,
    TSS_IST5 = 5,
    TSS_IST6 = 6,
    TSS_IST7 = 7,
    TSS_IST_COUNT = 7
} tss_ist_t;
 
#define TSS_IST_EXCEPTION TSS_IST1
 
#define TSS_IST_DOUBLE_FAULT TSS_IST2
 
#define TSS_IST_INTERRUPT TSS_IST3
 
typedef struct PACKED
{
    uint32_t reserved1;
    uint64_t rsp0; 
    uint64_t rsp1; 
    uint64_t rsp2; 
    uint64_t reserved2;
    uint64_t ist[7]; // Interrupt Stack Table.
    uint64_t reserved3;
    uint16_t reserved4;
    uint16_t iopb; 
} tss_t;
 
extern void tss_load(void);
 
void tss_init(tss_t* tss);
 
void tss_ist_load(tss_t* tss, tss_ist_t ist, stack_pointer_t* stack);