entering idle loop works with timer

1 files changed, 17 insertions, 0 deletions

diff --git a/kc/core/pit8253.c b/kc/core/pit8253.c
index 75e0467..8be2872 100644
--- a/kc/core/pit8253.c
+++ b/kc/core/pit8253.c
@@ -1,6 +1,7 @@
 #include "pit8253.h"
 #include "pic8259.h"
 #include "port.h"
+#include "kprint.h"
 
 #define PIT8253_DATA0 0x40
 #define PIT8253_CMD 0x43
@@ -12,12 +13,28 @@
 
 #define CONFIG_CHANNEL_0 (SEL_CHANNEL0|ACC_LOHI|MODE_RATE|BIN_COUNT)
 
+static uint64_t count = 0;
+
+int pit8253_callback(uint8_t irq)
+{
+    (void)irq;
+    count++;
+
+    if (!(count % (185)))
+    {
+        kprintf("it's been about %lu seconds\n", count / 18);
+    }
+
+    return 0;
+}
+
 void pit8253_init(void)
 {
     outb(PIT8253_CMD, CONFIG_CHANNEL_0);
     outb(PIT8253_DATA0, 0xff);
     outb(PIT8253_DATA0, 0xff);
 
+    pic8259_irq_install(0, pit8253_callback);
     pic8259_irq_unmask(0);
 }