X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fdevices%2Ftimer.c;h=a83a588d6884dc271bca00909148c0348a0b986a;hb=8fc9be2744dbe24bf5676a0502b36d5afe3b9ebb;hp=a4521de86e32b91b7a939f68e06d6f6c7a0b83b3;hpb=4ae5b30e5eb0be98521235060001c2d6d9828345;p=pintos-anon

diff --git a/src/devices/timer.c b/src/devices/timer.c
index a4521de..a83a588 100644
--- a/src/devices/timer.c
+++ b/src/devices/timer.c
@@ -3,8 +3,8 @@
 #include <inttypes.h>
 #include <round.h>
 #include <stdio.h>
+#include "devices/pit.h"
 #include "threads/interrupt.h"
-#include "threads/io.h"
 #include "threads/synch.h"
 #include "threads/thread.h"
   
@@ -29,20 +29,12 @@ static bool too_many_loops (unsigned loops);
 static void busy_wait (int64_t loops);
 static void real_time_sleep (int64_t num, int32_t denom);
 
-/* Sets up the 8254 Programmable Interval Timer (PIT) to
-   interrupt PIT_FREQ times per second, and registers the
-   corresponding interrupt. */
+/* Sets up the timer to interrupt TIMER_FREQ times per second,
+   and registers the corresponding interrupt. */
 void
 timer_init (void) 
 {
-  /* 8254 input frequency divided by TIMER_FREQ, rounded to
-     nearest. */
-  uint16_t count = (1193180 + TIMER_FREQ / 2) / TIMER_FREQ;
-
-  outb (0x43, 0x34);    /* CW: counter 0, LSB then MSB, mode 2, binary. */
-  outb (0x40, count & 0xff);
-  outb (0x40, count >> 8);
-
+  pit_configure_channel (0, 2, TIMER_FREQ);
   intr_register_ext (0x20, timer_interrupt, "8254 Timer");
 }