kernel/arch/x86/irq/idt.c

   1 #include <irq/idt.h>
   2 #include <stdint.h>
   3
   4 /* Note to self: passing a pointer to an asm constraint as "m" will give a pointer to pointer */
   5 inline void load_idt(struct idtr idtr)
   6 {
   7         asm volatile ("lidt %0": : "m" (idtr));
   8 }
   9
  10 void idt_set_descriptor(struct idt_descriptor *idt, uint8_t vector, uint16_t segment, uint32_t offset, uint8_t type, uint8_t dpl)
  11 {
  12         struct idt_descriptor *descriptor = &idt[vector];
  13
  14         descriptor->offset_1 = offset & 0xFFFF;
  15         descriptor->segsel = segment;
  16         descriptor->unused = 0;
  17         descriptor->type = type;
  18         descriptor->dpl = dpl;
  19         descriptor->present = 1;
  20         descriptor->offset_2 = offset >> 16;
  21 }
  22
  23 inline void populate_idtr(struct idtr *idtr, struct idt_descriptor *idt)
  24 {
  25         idtr->limit = ((IDT_VECTOR_COUNT * IDT_DESCRIPTOR_SIZE) - 1); /* limit must be size - 1 */
  26         idtr->base = (uint32_t) idt;
  27 }