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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
1.8 KiB
C++
68 lines
1.8 KiB
C++
#pragma once
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/// \file idt.h
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/// Definitions relating to a CPU's IDT table
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#include <stdint.h>
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class IDT
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{
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public:
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IDT();
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/// Get the currently running CPU's IDT
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static IDT & current();
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/// Set the global NMI handler. Must happen before creating
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/// any IDTs.
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static void set_nmi_handler(uintptr_t address);
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/// Install this IDT to the current CPU
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void install() const;
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/// Add the IST entries listed in the ISR table into the IDT.
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/// This can't be done until after memory is set up so the
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/// stacks can be created.
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void add_ist_entries();
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/// Get the IST entry used by an entry.
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/// \arg i Which IDT entry to look in
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/// \returns The IST index used by entry i, or 0 for none
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inline uint8_t get_ist(uint8_t i) const {
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return m_entries[i].ist;
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}
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/// Set the IST entry used by an entry.
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/// \arg i Which IDT entry to set
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/// \arg ist The IST index for entry i, or 0 for none
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void set_ist(uint8_t i, uint8_t ist) { m_entries[i].ist = ist; }
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/// Get the IST entries that are used by this table, as a bitmap
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uint8_t used_ist_entries() const;
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/// Dump debug information about the IDT 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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private:
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void set(uint8_t i, void (*handler)(), uint16_t selector, uint8_t flags);
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struct descriptor
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{
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uint16_t base_low;
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uint16_t selector;
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uint8_t ist;
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uint8_t flags;
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uint16_t base_mid;
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uint32_t base_high;
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uint32_t reserved; // must be zero
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} __attribute__ ((packed, aligned(16)));
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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, aligned(4)));
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descriptor m_entries[256];
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ptr m_ptr;
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};
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