From e024c54be1b94093171eb4182c5fc21db5b2d7e2 Mon Sep 17 00:00:00 2001
From: Ada Christine <adachristine18@gmail.com>
Date: Mon, 14 Feb 2022 16:13:23 +0000
Subject: more task scheduling work, scheduler appears to work without crashing

---
 kc/core/pit8253.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'kc/core/pit8253.c')

diff --git a/kc/core/pit8253.c b/kc/core/pit8253.c
index 8be2872..0cf5232 100644
--- a/kc/core/pit8253.c
+++ b/kc/core/pit8253.c
@@ -13,6 +13,8 @@
 
 #define CONFIG_CHANNEL_0 (SEL_CHANNEL0|ACC_LOHI|MODE_RATE|BIN_COUNT)
 
+#define PIT_HZ 1193182U
+
 static uint64_t count = 0;
 
 int pit8253_callback(uint8_t irq)
@@ -22,7 +24,7 @@ int pit8253_callback(uint8_t irq)
 
     if (!(count % (185)))
     {
-        kprintf("it's been about %lu seconds\n", count / 18);
+        kprintf("it's been about %lu seconds since starting\n", count / 18);
     }
 
     return 0;
@@ -30,6 +32,9 @@ int pit8253_callback(uint8_t irq)
 
 void pit8253_init(void)
 {
+    kprintf(
+            "initializing timer to an approximate frequency of %uHz\n",
+            PIT_HZ / 0xffff);
     outb(PIT8253_CMD, CONFIG_CHANNEL_0);
     outb(PIT8253_DATA0, 0xff);
     outb(PIT8253_DATA0, 0xff);
@@ -46,6 +51,11 @@ void pit8253_stop(void)
 {
 }
 
+uint64_t pit8253_count(void)
+{
+    return count;
+}
+
 void pit8253_set_hz(uint16_t hz)
 {
     (void)hz;
-- 
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