include/arch/x86/irq/idt.h

   1 #ifndef X86_IDT_H
   2 #define X86_IDT_H
   3
   4 #include <stdint.h>
   5
   6 #define IDT_VECTOR_COUNT 256 /* our IDT will have 256 vectors */
   7 #define IDT_DESCRIPTOR_SIZE 8 /* each IDT descriptor is 8 bytes long */
   8
   9 #define IDT_TRAP_GATE           0xF
  10 #define IDT_INTERRUPT_GATE      0xE
  11
  12 struct idt_descriptor {
  13         uint16_t offset_1; /* bits 0-15 of offset */
  14         uint16_t segsel; /* segment selector */
  15         unsigned unused : 8, type : 5, dpl : 2, present : 1;
  16         uint16_t offset_2; /* bits 16-31 of offset */
  17 } __attribute__((packed));
  18
  19 struct idtr {
  20         uint16_t limit; /* size of IDT minus 1 */
  21         uint32_t base; /* starting address of IDT */
  22 } __attribute__((packed));
  23
  24 extern void idt_set_descriptor(struct idt_descriptor *idt, uint8_t vector, uint16_t segment, uint32_t offset, uint8_t type, uint8_t dpl);
  25 extern inline void load_idt(struct idtr idtr);
  26 extern inline void populate_idtr(struct idtr *idtr, struct idt_descriptor *idt);
  27
  28 #endif