44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
#include <stdbool.h>
|
|
|
|
#include <kernel/x86/idt.h>
|
|
|
|
__attribute__((aligned(0x10)))
|
|
static idt_entry_t idt[256];
|
|
|
|
static idtr_t idtr;
|
|
|
|
static bool vectors[IDT_MAX_DESCRIPTORS];
|
|
|
|
void exception_handler()
|
|
{
|
|
__asm__ volatile ("cli; hlt"); // hangs the computer
|
|
}
|
|
|
|
void idt_set_descriptor(uint8_t vector, void *isr, uint8_t flags)
|
|
{
|
|
idt_entry_t* descriptor = &idt[vector];
|
|
|
|
descriptor->isr_low = (uint32_t) isr & 0xFFFF;
|
|
descriptor->kernel_cs = 0x08; // this is whatever the kernel code selector is in the GDT
|
|
descriptor->attributes = flags;
|
|
descriptor->isr_high = (uint32_t) isr >> 16;
|
|
descriptor->reserved = 0;
|
|
}
|
|
|
|
|
|
extern void* isr_stub_table[];
|
|
void idt_init(void)
|
|
{
|
|
idtr.base = (uintptr_t)&idt[0];
|
|
idtr.limit = (uint16_t) sizeof(idt_entry_t) * IDT_MAX_DESCRIPTORS - 1;
|
|
|
|
for (uint8_t vector = 0; vector < 32; vector++) {
|
|
idt_set_descriptor(vector, isr_stub_table[vector], 0x8E);
|
|
vectors[vector] = true;
|
|
}
|
|
|
|
__asm__ volatile("lidt %0" : : "m"(idtr)); // load the new IDT
|
|
__asm__ volatile("sti"); // set the interrupt flag
|
|
}
|
|
|