timer & stdbuff

1 files changed, 27 insertions, 0 deletions

diff --git a/kernel/src/devices/timer.c b/kernel/src/devices/timer.c
new file mode 100644
index 0000000..1291219
--- /dev/null
+++ b/kernel/src/devices/timer.c
@@ -0,0 +1,27 @@
+#include <timer.h>
+#include <libk/stdio.h>
+#include <io.h>
+
+uint32_t tick = 0;
+uint32_t seconds = 0;
+
+void timer_handler()
+{
+	tick++;
+	if (tick > TICKS_PER_SECOND) {
+		tick = 0;
+		seconds++;
+	}
+}
+
+void init_timer(uint32_t frequency)
+{
+	uint32_t divisor = 1193180 / frequency;
+	outb(0x43, 0x36);
+
+	uint8_t l = (uint8_t)(divisor & 0xFF);
+	uint8_t h = (uint8_t)((divisor>>8) & 0xFF);
+
+	outb(0x40, l);
+	outb(0x40, h);
+}