Look Ma' what I found on my harddisk ...

 o New faster syscalls for 2.1.x, too
 o Upgrade to 2.1.89.

Don't try to run this.  It's flaky as hell.  But feel free to debug ...

1 files changed, 15 insertions, 43 deletions

diff --git a/arch/ppc/kernel/time.h b/arch/ppc/kernel/time.h
index 9ce5921dc..538ac7bb1 100644
--- a/arch/ppc/kernel/time.h
+++ b/arch/ppc/kernel/time.h
@@ -1,5 +1,5 @@
 /*
- * $Id: time.h,v 1.5 1997/08/27 22:06:58 cort Exp $
+ * $Id: time.h,v 1.7 1997/12/28 22:47:24 paulus Exp $
  * Common time prototypes and such for all ppc machines.
  *
  * Written by Cort Dougan (cort@cs.nmt.edu) to merge
@@ -9,17 +9,16 @@
 #include <linux/mc146818rtc.h>
 
 /* time.c */
-__inline__ unsigned long get_dec(void);
-__inline__ void set_dec(int val);
 void prep_calibrate_decr_handler(int, void *,struct pt_regs *);
 void prep_calibrate_decr(void);
 void pmac_calibrate_decr(void);
-void chrp_calibrate_decr(void);
 extern unsigned decrementer_count;
 extern unsigned count_period_num;
 extern unsigned count_period_den;
 extern unsigned long mktime(unsigned int, unsigned int,unsigned int,
-				   unsigned int, unsigned int, unsigned int);
+			    unsigned int, unsigned int, unsigned int);
+extern void to_tm(int tim, struct rtc_time * tm);
+extern unsigned long last_rtc_update;
 
 /* pmac/prep/chrp_time.c */
 unsigned long prep_get_rtc_time(void);
@@ -29,46 +28,19 @@ int prep_set_rtc_time(unsigned long nowtime);
 int pmac_set_rtc_time(unsigned long nowtime);
 int chrp_set_rtc_time(unsigned long nowtime);
 void pmac_read_rtc_time(void);
+void chrp_calibrate_decr(void);
+void chrp_time_init(void);
 
-#define TICK_SIZE tick
-#define FEBRUARY	2
-#define	STARTOFTIME	1970
-#define SECDAY		86400L
-#define SECYR		(SECDAY * 365)
-#define	leapyear(year)		((year) % 4 == 0)
-#define	days_in_year(a) 	(leapyear(a) ? 366 : 365)
-#define	days_in_month(a) 	(month_days[(a) - 1])
-
-static int      month_days[12] = {
-	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
-};
-
-extern void inline to_tm(int tim, struct rtc_time * tm)
+/* Accessor functions for the decrementer register. */
+static __inline__ unsigned int get_dec(void)
 {
-	register int    i;
-	register long   hms, day;
-
-	day = tim / SECDAY;
-	hms = tim % SECDAY;
+	unsigned int ret;
 
-	/* Hours, minutes, seconds are easy */
-	tm->tm_hour = hms / 3600;
-	tm->tm_min = (hms % 3600) / 60;
-	tm->tm_sec = (hms % 3600) % 60;
-
-	/* Number of years in days */
-	for (i = STARTOFTIME; day >= days_in_year(i); i++)
-		day -= days_in_year(i);
-	tm->tm_year = i;
-
-	/* Number of months in days left */
-	if (leapyear(tm->tm_year))
-		days_in_month(FEBRUARY) = 29;
-	for (i = 1; day >= days_in_month(i); i++)
-		day -= days_in_month(i);
-	days_in_month(FEBRUARY) = 28;
-	tm->tm_mon = i;
+	asm volatile("mfspr %0,22" : "=r" (ret) :);
+	return ret;
+}
 
-	/* Days are what is left over (+1) from all that. */
-	tm->tm_mday = day + 1;
+static __inline__ void set_dec(unsigned int val)
+{
+	asm volatile("mtspr 22,%0" : : "r" (val));
 }