Initial commit

wiipax/stub/time.c

@@ -0,0 +1,27 @@
+#include "common.h"
+
+// Timebase frequency is bus frequency / 4.  Ignore roundoff, this
+// doesn't have to be very accurate.
+#define TICKS_PER_USEC (243/4)
+
+static u32 mftb(void)
+{
+	u32 x;
+
+	asm volatile("mftb %0" : "=r"(x));
+
+	return x;
+}
+
+static void __delay(u32 ticks)
+{
+	u32 start = mftb();
+
+	while (mftb() - start < ticks)
+		;
+}
+
+void udelay(u32 us)
+{
+	__delay(TICKS_PER_USEC * us);
+}