58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
#pragma once
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#include "memory/pointer.h"
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#include "util/optional.h"
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struct [[gnu::packed]] gdt_register_t {
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uint16_t limit;
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uint64_t base;
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};
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static_assert(sizeof(gdt_register_t) == 10);
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struct Gdt {
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using selector_t = uint16_t;
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enum class segment_type_t : uint8_t {
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code,
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data,
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task_state,
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};
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struct flags_t {
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segment_type_t type;
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uint8_t privilege_level;
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bool long_mode;
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bool default_operand_32bit;
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bool granularity_4KiB;
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bool readable_writeable;
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};
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struct segment_t {
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flags_t flags;
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uint64_t base;
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uint32_t limit;
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};
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static Gdt fromCurrent();
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static optional<Gdt> allocNew();
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void activate();
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optional<selector_t> add(segment_t segment);
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optional<segment_t> get(selector_t selector);
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paddr_t base;
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uint16_t limit;
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};
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struct [[gnu::packed]] tss_t {
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uint32_t reserved0;
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uint64_t rsp[3];
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uint64_t reserved1;
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uint64_t ist[7];
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uint64_t reserved2;
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uint16_t reserved3;
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uint16_t iomap_base;
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};
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static_assert(sizeof(tss_t) == 104);
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void reloadSegments(Gdt::selector_t code_selector, Gdt::selector_t data_selector);
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