# HG changeset patch
# User Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
# Date 1299713994 18000
# Node ID a4d737f03f883895d1718d9b346073e513f0e5bb
# Parent  e2b1d61847032f4484b1d853336df4ae2dfd2e2f
import TOD code

diff -r e2b1d6184703 -r a4d737f03f88 include/tod.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/tod.h	Wed Mar 09 18:39:54 2011 -0500
@@ -0,0 +1,45 @@
+#ifndef __TOD_H
+#define __TOD_H
+
+/*
+ * The Time Of Day (TOD) hardware adds 1 to the 51st bit every microsecond
+ * The timer hardware subtracts 1 from the 51st bit every microsecond
+ */
+#define TOD_MICROSEC		0x0000000000001000UL
+#define TOD_SEC			0x0000000f4240000ULL
+#define TOD_MIN			0x000003938700000ULL
+#define TOD_HOUR		0x0000d693a400000ULL
+#define TOD_DAY			0x00141dd76000000ULL
+#define TOD_YEAR		0x1cae8c13e000000ULL /* not leap */
+#define TOD_FOURYEARS		0x72ce4e26e000000ULL
+
+/*
+ * Stores (if possible) the current TOD value.
+ *
+ * Returns:
+ *   0 on success, *tod contains current time & date
+ *                 *tod == 0 is midnight, Jan 1, 1900
+ *   1 on success, *tod contains uptime
+ *                 *tod == 0 is the instant the system powered on
+ *   2 or 3 on failure, value of *tod is unpredictable
+ */
+static inline int get_tod(u64 *tod)
+{
+	int cc;
+
+	asm volatile(
+		"stck	%0\n"
+		"ipm	%1\n"
+		"srl	%1,28\n"
+	: /* output */
+	  "=m" (*tod),
+	  "=d" (cc)
+	: /* input */
+	: /* clobber */
+	  "cc"
+	);
+
+	return cc;
+}
+
+#endif