Dynamic IRQ handling

kernel/platform/i386_pc/sys/pit.c

@@ -30,9 +30,13 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
 #include <libk/types.h>
+#include <libk/compiler.h>
 #include <sys/pit.h>
 #include <sys/ioport.h>
+#include <sys/isr.h>
 #include <sync/spinlock.h>
+#include <irq/irqhandler.h>
+#include <config.h>
 
 #define PIT_COUNTER0      0x40
 #define PIT_CMD           0x43
@@ -65,14 +69,21 @@ uint32_t ticks_get(void) {
   return t;
 }
 
-void ticks_increment(void) {
+static void ticks_increment(void) {
   sl_lock(&ticks_spinlock);
   ticks++;
   sl_unlock(&ticks_spinlock);
 }
 
+static void pit_irqhandler(unused void *cpustate) {
+  ticks_increment();
+}
+
 void pit_init(void) {
   sl_init(&ticks_spinlock, "ticks");
+  
+  irqhandler_register(IRQ_PIT, &pit_irqhandler);
+  irqhandler_enable(IRQ_PIT);
 
   uint32_t hz = 1000;
   uint32_t div = PIT_FREQ / hz;