2 * Common time prototypes and such for all ppc machines.
4 * Written by Cort Dougan (cort@cs.nmt.edu) to merge
5 * Paul Mackerras' version and mine for PReP and Pmac.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #ifndef __PPC64_TIME_H
14 #define __PPC64_TIME_H
17 #include <linux/config.h>
18 #include <linux/types.h>
19 #include <linux/mc146818rtc.h>
21 #include <asm/processor.h>
23 #include <asm/iSeries/HvCall.h>
26 extern unsigned long tb_ticks_per_jiffy;
27 extern unsigned long tb_ticks_per_usec;
28 extern unsigned long tb_ticks_per_sec;
29 extern unsigned long tb_to_xs;
30 extern unsigned tb_to_us;
31 extern unsigned long tb_last_stamp;
34 extern void to_tm(int tim, struct rtc_time * tm);
35 extern time_t last_rtc_update;
37 void generic_calibrate_decr(void);
38 void setup_default_decr(void);
40 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
41 extern unsigned long ppc_proc_freq;
42 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
43 extern unsigned long ppc_tb_freq;
44 #define DEFAULT_TB_FREQ 125000000UL
47 * By putting all of this stuff into a single struct we
48 * reduce the number of cache lines touched by do_gettimeofday.
49 * Both by collecting all of the data in one cache line and
50 * by touching only one TOC entry
52 struct gettimeofday_vars {
53 unsigned long tb_to_xs;
54 unsigned long stamp_xsec;
55 unsigned long tb_orig_stamp;
58 struct gettimeofday_struct {
59 unsigned long tb_ticks_per_sec;
60 struct gettimeofday_vars vars[2];
61 struct gettimeofday_vars * volatile varp;
67 unsigned long result_high;
68 unsigned long result_low;
71 int via_calibrate_decr(void);
73 static __inline__ unsigned long get_tb(void)
78 /* Accessor functions for the decrementer register. */
79 static __inline__ unsigned int get_dec(void)
81 return (mfspr(SPRN_DEC));
84 static __inline__ void set_dec(int val)
86 #ifdef CONFIG_PPC_ISERIES
87 struct paca_struct *lpaca = get_paca();
90 if (lpaca->lppaca.shared_proc) {
91 lpaca->lppaca.virtual_decr = val;
94 HvCall_setVirtualDecr();
100 static inline unsigned long tb_ticks_since(unsigned long tstamp)
102 return get_tb() - tstamp;
105 #define mulhwu(x,y) \
106 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
107 #define mulhdu(x,y) \
108 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
111 unsigned mulhwu_scale_factor(unsigned, unsigned);
112 void div128_by_32( unsigned long dividend_high, unsigned long dividend_low,
113 unsigned divisor, struct div_result *dr );
115 /* Used to store Processor Utilization register (purr) values */
118 u64 current_tb; /* Holds the current purr register values */
121 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
123 #endif /* __KERNEL__ */
124 #endif /* __PPC64_TIME_H */