Espresso 0.0.0e

drivers/pit.c

@@ -0,0 +1,32 @@
+/*#include <stdint.h>
+#include <port_io.h>
+#include <drivers/irq.h>
+
+#define PIT_CHANNEL0 0x40
+#define PIT_COMMAND  0x43
+#define PIT_FREQUENCY 1193182
+
+static uint32_t tick = 0;
+
+void pit_callback(struct regs* r)
+{
+  (void)r;
+  tick++;
+}
+
+void pit_init(uint32_t frequency)
+{
+  uint32_t divisor = PIT_FREQUENCY / frequency;
+
+  outb(PIT_COMMAND, 0x36);
+  outb(PIT_CHANNEL0, (uint8_t)(divisor & 0xFF));
+  outb(PIT_CHANNEL0, (uint8_t)((divisor >> 8) & 0xFF));
+
+  register_interrupt_handler(32, pit_callback); 
+}
+
+void sleep(uint32_t milliseconds)
+{
+  uint32_t target = tick + milliseconds;
+  while (tick < target);
+}*/