feat(pit): add pit to isr and idt entries

k/idt.c

@@ -1,8 +1,9 @@
 #include "idt.h"
-#include "stdio.h"
-#include "pic/pic.h"
 #include "io.h"
 #include "pic/keyboard.h"
+#include "pic/pic.h"
+#include "pic/pit.h"
+#include "stdio.h"
 
 static struct idt idt = { 0 };
 
@@ -25,17 +26,21 @@ static struct idt_entry_info infos[] = {
     {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},
 
     // user-defined (32-255)
-    {0, INTERRUPT_TYPE},    {pic_keyboard, INTERRUPT_TYPE}
+    {pic_pit, INTERRUPT_TYPE},    {pic_keyboard, INTERRUPT_TYPE}
 };
 
 void handle_interrupt(struct int_args *args)
 {
-    if (args->int_code >= 32)
+    switch (args->int_code)
     {
-        add_key_to_buffer();
-
-        outb(MASTER_PORT_A, OCW2_EOI);
-        return;
+        case 32: // PIT
+            pit_handler();
+            outb(MASTER_PORT_A, OCW2_EOI);
+            return;
+        case 33: // keyboard
+            keyboard_handler();
+            outb(MASTER_PORT_A, OCW2_EOI);
+            return;
     }
 
     printf("INTERRUPT: %d, error code: %d\r\n", args->int_code, args->err_code);

k/isr.S

@@ -48,4 +48,5 @@ ISR_NO_ERRCODE(int_xm, 19)
 ISR_NO_ERRCODE(int_ve, 20)
 
 // user-defined
+ISR_NO_ERRCODE(pic_pit, 32)
 ISR_NO_ERRCODE(pic_keyboard, 33)

k/isr.h

@@ -24,6 +24,8 @@ void int_xm(void);      // SIMD Floating-Point Exception
 void int_ve(void);      // Virtualization Exception
 
 // ISR for PIC interrupts.
+
+void pic_pit(void);
 void pic_keyboard(void);
 
 #endif  /* !ISR_H */