kernel/arch/x86/irq/sample_handler.c

   1 #include <tty.h>
   2 #include <irq/i8259a.h>
   3 #include <io.h>
   4 #include <stdint.h>
   5 #include <input/ps2.h>
   6
   7 int was_released = 0;
   8 int is_caps = 0;
   9
  10 typedef uint32_t uword_t;
  11
  12 struct interrupt_frame {
  13         uword_t ip;
  14         uword_t cs;
  15         uword_t flags;
  16 };
  17
  18 struct abort_frame;
  19
  20 __attribute__((interrupt))
  21 void keyb_handler(struct interrupt_frame *frame)
  22 {
  23         pic_send_eoi(1);
  24         uint8_t scancode = inb(PS2_DATA_PORT);
  25         if (was_released) {
  26                 was_released = 0;
  27                 return;
  28         }
  29
  30         if (scancode == 0xf0) {
  31                 was_released = 1;
  32                 uint8_t scancode = inb(PS2_DATA_PORT);
  33                 if (scancode == 0x12) {
  34                         is_caps = 0;
  35                 }
  36                 return;
  37         } else {
  38                 if (scancode == 0x12) {
  39                         is_caps = 1;
  40                         return;
  41                 }
  42                 if (!is_caps) {
  43                         kprintc(scancodes[scancode], 0);
  44                 } else {
  45                         kprintc(scancodes[scancode] - ('a'-'A'), 0);
  46                 }
  47         }
  48 }
  49
  50
  51 __attribute__((interrupt))
  52 void double_fault(struct abort_frame *frame)
  53 {
  54         *(volatile uint32_t *) (0xb8000) = 0xcf28cf3a;
  55 halt:
  56         asm volatile ("cli; hlt");
  57         goto halt;
  58 }
  59