rulimine/common/sys/idt.s2.c

36 lines
824 B
C

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