include/asm-ppc64/time.h

   1 /*
   2  * Common time prototypes and such for all ppc machines.
   3  *
   4  * Written by Cort Dougan (cort@cs.nmt.edu) to merge
   5  * Paul Mackerras' version and mine for PReP and Pmac.
   6  *
   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.
  11  */
  12
  13 #ifndef __PPC64_TIME_H
  14 #define __PPC64_TIME_H
  15
  16 #ifdef __KERNEL__
  17 #include <linux/config.h>
  18 #include <linux/types.h>
  19 #include <linux/mc146818rtc.h>
  20
  21 #include <asm/processor.h>
  22 #include <asm/paca.h>
  23 #include <asm/iSeries/HvCall.h>
  24
  25 /* time.c */
  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;
  32
  33 struct rtc_time;
  34 extern void to_tm(int tim, struct rtc_time * tm);
  35 extern time_t last_rtc_update;
  36
  37 void generic_calibrate_decr(void);
  38 void setup_default_decr(void);
  39
  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
  45
  46 /*
  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
  51  */
  52 struct gettimeofday_vars {
  53         unsigned long tb_to_xs;
  54         unsigned long stamp_xsec;
  55         unsigned long tb_orig_stamp;
  56 };
  57
  58 struct gettimeofday_struct {
  59         unsigned long tb_ticks_per_sec;
  60         struct gettimeofday_vars vars[2];
  61         struct gettimeofday_vars * volatile varp;
  62         unsigned      var_idx;
  63         unsigned      tb_to_us;
  64 };
  65
  66 struct div_result {
  67         unsigned long result_high;
  68         unsigned long result_low;
  69 };
  70
  71 int via_calibrate_decr(void);
  72
  73 static __inline__ unsigned long get_tb(void)
  74 {
  75         return mftb();
  76 }
  77
  78 /* Accessor functions for the decrementer register. */
  79 static __inline__ unsigned int get_dec(void)
  80 {
  81         return (mfspr(SPRN_DEC));
  82 }
  83
  84 static __inline__ void set_dec(int val)
  85 {
  86 #ifdef CONFIG_PPC_ISERIES
  87         struct paca_struct *lpaca = get_paca();
  88         int cur_dec;
  89
  90         if (lpaca->lppaca.shared_proc) {
  91                 lpaca->lppaca.virtual_decr = val;
  92                 cur_dec = get_dec();
  93                 if (cur_dec > val)
  94                         HvCall_setVirtualDecr();
  95         } else
  96 #endif
  97                 mtspr(SPRN_DEC, val);
  98 }
  99
 100 static inline unsigned long tb_ticks_since(unsigned long tstamp)
 101 {
 102         return get_tb() - tstamp;
 103 }
 104
 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;})
 109
 110
 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 );
 114
 115 /* Used to store Processor Utilization register (purr) values */
 116
 117 struct cpu_usage {
 118         u64 current_tb;  /* Holds the current purr register values */
 119 };
 120
 121 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 122
 123 #endif /* __KERNEL__ */
 124 #endif /* __PPC64_TIME_H */