8f529046a9
I'm a tabs guy. I like tabs, it's an elegant way to represent indentation instead of brute-forcing it. But I have to admit that the world seems to be going towards spaces, and tooling tends not to play nice with tabs. So here we go, changing the whole repo to spaces since I'm getting tired of all the inconsistent formatting.
68 lines
1.4 KiB
C++
68 lines
1.4 KiB
C++
#pragma once
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/// \file gdt.h
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/// Definitions relating to a CPU's GDT table
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#include <stdint.h>
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#include "enum_bitfields.h"
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class TSS;
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class GDT
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{
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public:
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GDT(TSS *tss);
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/// Get the currently running CPU's GDT
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static GDT & current();
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/// Install this GDT to the current CPU
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void install() const;
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/// Get the addrss of the pointer
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inline const void * pointer() const { return static_cast<const void*>(&m_ptr); }
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/// Dump debug information about the GDT to the console.
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/// \arg index Which entry to print, or -1 for all entries
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void dump(unsigned index = -1) const;
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enum class type : uint8_t
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{
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accessed = 0x01,
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read_write = 0x02,
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conforming = 0x04,
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execute = 0x08,
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system = 0x10,
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ring1 = 0x20,
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ring2 = 0x40,
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ring3 = 0x60,
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present = 0x80
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};
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private:
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void set(uint8_t i, uint32_t base, uint64_t limit, bool is64, type t);
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void set_tss(TSS *tss);
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struct descriptor
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{
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uint16_t limit_low;
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uint16_t base_low;
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uint8_t base_mid;
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type type;
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uint8_t size;
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uint8_t base_high;
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} __attribute__ ((packed, align(8)));
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struct ptr
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{
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uint16_t limit;
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descriptor *base;
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} __attribute__ ((packed, align(4)));
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descriptor m_entries[8];
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TSS *m_tss;
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ptr m_ptr;
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};
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is_bitfield(GDT::type);
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