kernel/arch/x86/irq/interrupt.c

   1 #include <irq/idt.h>
   2 #include <irq/interrupt.h>
   3 #include <kprint.h>
   4 #include <stddef.h>
   5 #include <irq/i8259a.h>
   6
   7 /* This table will hold pointers to our interrupt handlers. */
   8 static int (*int_handler_table[256])(struct interrupt_frame *);
   9
  10 void int_handler(struct interrupt_frame *frame)
  11 {
  12         int interrupt = frame->interrupt;
  13         if (int_handler_table[interrupt] == NULL) {
  14                 kprint("WARNING: Unhandled interrupt ", VGA_YELLOW, VGA_BLACK);
  15                 kprintb(interrupt, 1);
  16                 kprint(" occurred!\n", VGA_YELLOW, VGA_BLACK);
  17         } else {
  18                 int ret = (*int_handler_table[interrupt])(frame);
  19                 if (ret) {
  20                         kprint("WARNING: Error while handling interrupt ", VGA_YELLOW, VGA_BLACK);
  21                         kprintb(interrupt, 1);
  22                         kprint("!\n", VGA_YELLOW, VGA_BLACK);
  23                 }
  24         }
  25         if (interrupt >= 0x20) {
  26                 pic_send_eoi(interrupt - 0x20);
  27         }
  28 }
  29
  30 int register_interrupt(int irq, int (*handler)(struct interrupt_frame *))
  31 {
  32         int_handler_table[irq] = handler;
  33         if (irq >= 32 && irq < 48) {
  34                 pic_unmask(irq-32);
  35         }
  36         return 0;
  37 }