Modularize interrupt handlers, split up scheduler and PIT interrupt handlers

kernel/dev/ps2kbdev.c

@@ -8,6 +8,7 @@
 #include "proc/proc.h"
 #include "io/io.h"
 #include "ipc/mbus/mbus.h"
+#include "intr/intr.h"
 #include "errors.h"
 #include "hshtb.h"
 #include "kprintf.h"
@@ -155,12 +156,16 @@ int32_t ps2kb_intr(void) {
 
 IpcMBus *PS2KB_MBUS;
 
-void ps2kbdev_intr(void) {
+int ps2kbdev_intr(IntrStackFrame *frame) {
+  (void)frame;
+
   int32_t c = ps2kb_intr();
   if (c >= 0) {
     uint8_t b = c;
     ipc_mbuspublish("ps2kb", &b);
   }
+
+  return INTR_OK;
 }
 
 void ps2kbdev_init(void) {