76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
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#ifndef _KERNEL_PLATFORM_X86_TASKING_TSS_H
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#define _KERNEL_PLATFORM_X86_TASKING_TSS_H
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#include <libkern/c_attrs.h>
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#include <libkern/types.h>
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#define SEGTSS_TYPE 0x9 // defined in the Intel's manual 3a
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#ifdef __i386__
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struct PACKED tss {
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uint32_t back_link : 16; // back link to prev tss
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uint32_t zero1 : 16; // always zero
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uint32_t esp0 : 32; // stack pointer at ring 0
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uint32_t ss0 : 16; // stack segment at ring 0
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uint32_t zero2 : 16; // always zero
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uint32_t esp1 : 32; // stack pointer at ring 1
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uint32_t ss1 : 16; // stack segment at ring 1
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uint32_t zero3 : 16; // always zero
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uint32_t esp2 : 32; // stack pointer at ring 2
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uint32_t ss2 : 16; // stack segment at ring 2
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uint32_t zero4 : 16; // always zero
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uint32_t cr3 : 32;
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uint32_t eip : 32;
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uint32_t eflag : 32;
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uint32_t eax : 32;
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uint32_t ecx : 32;
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uint32_t edx : 32;
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uint32_t ebx : 32;
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uint32_t esp : 32;
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uint32_t ebp : 32;
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uint32_t esi : 32;
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uint32_t edi : 32;
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uint32_t es : 16;
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uint32_t zero5 : 16; // always zero
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uint32_t cs : 16;
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uint32_t zero6 : 16; // always zero
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uint32_t ss : 16;
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uint32_t zero7 : 16; // always zero
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uint32_t ds : 16;
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uint32_t zero8 : 16; // always zero
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uint32_t fs : 16;
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uint32_t zero9 : 16; // always zero
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uint32_t gs : 16;
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uint32_t zero10 : 16; // always zero
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uint32_t ldt_selector : 16;
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uint32_t zero11 : 16; // always zero
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uint32_t t : 1;
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uint32_t zero12 : 15; // always zero
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uint32_t iomap_offset : 16;
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};
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#elif __x86_64__
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struct PACKED tss {
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uint32_t res1;
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uint64_t rsp0;
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uint64_t rsp1;
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uint64_t rsp2;
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uint64_t res2;
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uint64_t ist1;
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uint64_t ist2;
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uint64_t ist3;
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uint64_t ist4;
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uint64_t ist5;
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uint64_t ist6;
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uint64_t ist7;
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uint64_t res3;
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uint16_t res4;
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uint16_t iomap_offset;
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};
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#endif
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typedef struct tss tss_t;
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extern tss_t tss;
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void set_ltr(uint16_t seg);
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#endif //_KERNEL_PLATFORM_X86_TASKING_TSS_H
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