patch-2.4.19 linux-2.4.19/include/asm-ppc64/time.h

• Lines: 104
• Date: Fri Aug 2 17:39:45 2002
• Orig file: linux-2.4.18/include/asm-ppc64/time.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/include/asm-ppc64/time.h linux-2.4.19/include/asm-ppc64/time.h
@@ -0,0 +1,103 @@
+/*
+ * Common time prototypes and such for all ppc machines.
+ *
+ * Written by Cort Dougan (cort@cs.nmt.edu) to merge
+ * Paul Mackerras' version and mine for PReP and Pmac.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef __PPC64_TIME_H
+#define __PPC64_TIME_H
+
+#ifdef __KERNEL__
+#include <linux/types.h>
+#include <linux/mc146818rtc.h>
+
+#include <asm/processor.h>
+#include <asm/paca.h>
+#include <asm/iSeries/HvCall.h>
+
+/* time.c */
+extern unsigned long tb_ticks_per_jiffy;
+extern unsigned long tb_ticks_per_usec;
+extern unsigned long tb_ticks_per_sec;
+extern unsigned long tb_to_xs;
+extern unsigned      tb_to_us;
+extern unsigned long tb_last_stamp;
+
+struct rtc_time;
+extern void to_tm(int tim, struct rtc_time * tm);
+extern time_t last_rtc_update;
+
+/*
+ * By putting all of this stuff into a single struct we 
+ * reduce the number of cache lines touched by do_gettimeofday.
+ * Both by collecting all of the data in one cache line and
+ * by touching only one TOC entry
+ */
+struct gettimeofday_vars {
+	unsigned long tb_to_xs;
+	unsigned long stamp_xsec;
+};
+
+struct gettimeofday_struct {
+	unsigned long tb_orig_stamp;
+	unsigned long tb_ticks_per_sec;
+	struct gettimeofday_vars vars[2];
+	struct gettimeofday_vars * volatile varp;
+	unsigned      var_idx;
+	unsigned      tb_to_us;
+};
+
+struct div_result {
+	unsigned long result_high;
+	unsigned long result_low;
+};
+
+int via_calibrate_decr(void);
+
+static __inline__ unsigned long get_tb(void)
+{
+	return mftb();
+}
+
+/* Accessor functions for the decrementer register. */
+static __inline__ unsigned int get_dec(void)
+{
+	return (mfspr(SPRN_DEC));
+}
+
+static __inline__ void set_dec(int val)
+{
+	struct paca_struct *lpaca = get_paca();
+	int cur_dec;
+
+	if ( lpaca->xLpPaca.xSharedProc ) {
+		lpaca->xLpPaca.xVirtualDecr = val;
+		cur_dec = get_dec();
+		if ( cur_dec > val )
+			HvCall_setVirtualDecr();
+	} else {
+		mtspr(SPRN_DEC, val);
+	}
+}
+
+extern __inline__ unsigned long tb_ticks_since(unsigned long tstamp) {
+	return get_tb() - tstamp;
+}
+
+#define mulhwu(x,y) \
+({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
+#define mulhdu(x,y) \
+({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
+
+
+unsigned mulhwu_scale_factor(unsigned, unsigned);
+void div128_by_32( unsigned long dividend_high, unsigned long dividend_low,
+		   unsigned divisor, struct div_result *dr );
+#endif /* __KERNEL__ */
+#endif /* __PPC64_TIME_H */