56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
#include "interrupt/interrupt.h"
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#include <stdint.h>
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#include "debug/debug.h"
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#define IDT_INTERRUPT_GATE 0x8E
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#define KERNEL_CS 0x8
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struct InterruptDescriptorTablePointer {
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uint16_t size;
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uint64_t base;
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} __attribute__((packed));
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struct InterruptDescriptor {
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uint16_t offset_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 offset_medium;
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uint32_t offset_high;
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uint32_t zero;
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} __attribute__((packed));
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static InterruptDescriptor gIdt[256];
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InterruptDescriptor CreateDescriptor(void isr(void)) {
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uint64_t offset = reinterpret_cast<uint64_t>(isr);
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return InterruptDescriptor{
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.offset_low = static_cast<uint16_t>(offset),
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.selector = KERNEL_CS,
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.ist = 0,
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.flags = IDT_INTERRUPT_GATE,
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.offset_medium = static_cast<uint16_t>(offset >> 16),
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.offset_high = static_cast<uint32_t>(offset >> 32),
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.zero = 0x0,
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};
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}
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extern "C" void isr_divide_by_zero();
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extern "C" void interrupt_divide_by_zero(void* frame) { panic("DIV0"); }
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extern "C" void isr_protection_fault();
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extern "C" void interrupt_protection_fault(void* frame) { panic("GP"); }
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void InitIdt() {
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gIdt[0] = CreateDescriptor(isr_divide_by_zero);
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gIdt[13] = CreateDescriptor(isr_protection_fault);
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InterruptDescriptorTablePointer idtp{
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.size = sizeof(gIdt),
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.base = reinterpret_cast<uint64_t>(gIdt),
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};
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asm volatile("lidt %0" ::"m"(idtp));
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}
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