36 lines
829 B
C
36 lines
829 B
C
#include <stddef.h>
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#include <stdint.h>
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#include <sys/idt.h>
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#include <lib/misc.h>
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#if defined (BIOS)
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static struct idt_entry idt_entries[32];
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__attribute__((section(".realmode")))
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struct idtr idt = {
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sizeof(idt_entries) - 1,
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(uintptr_t)idt_entries
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};
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static void register_interrupt_handler(size_t vec, void *handler, uint8_t type) {
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uint32_t p = (uint32_t)handler;
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idt_entries[vec].offset_lo = (uint16_t)p;
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idt_entries[vec].selector = 0x18;
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idt_entries[vec].unused = 0;
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idt_entries[vec].type_attr = type;
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idt_entries[vec].offset_hi = (uint16_t)(p >> 16);
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}
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extern void *exceptions[];
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void init_idt(void) {
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for (size_t i = 0; i < SIZEOF_ARRAY(idt_entries); i++)
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register_interrupt_handler(i, exceptions[i], 0x8e);
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asm volatile ("lidt %0" :: "m"(idt) : "memory");
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}
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#endif
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