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 /*
  38  * By putting all of this stuff into a single struct we
  39  * reduce the number of cache lines touched by do_gettimeofday.
  40  * Both by collecting all of the data in one cache line and
  41  * by touching only one TOC entry
  42  */
  43 struct gettimeofday_vars {
  44         unsigned long tb_to_xs;
  45         unsigned long stamp_xsec;
  46         unsigned long tb_orig_stamp;
  47 };
  48
  49 struct gettimeofday_struct {
  50         unsigned long tb_ticks_per_sec;
  51         struct gettimeofday_vars vars[2];
  52         struct gettimeofday_vars * volatile varp;
  53         unsigned      var_idx;
  54         unsigned      tb_to_us;
  55 };
  56
  57 struct div_result {
  58         unsigned long result_high;
  59         unsigned long result_low;
  60 };
  61
  62 int via_calibrate_decr(void);
  63
  64 static __inline__ unsigned long get_tb(void)
  65 {
  66         return mftb();
  67 }
  68
  69 /* Accessor functions for the decrementer register. */
  70 static __inline__ unsigned int get_dec(void)
  71 {
  72         return (mfspr(SPRN_DEC));
  73 }
  74
  75 static __inline__ void set_dec(int val)
  76 {
  77 #ifdef CONFIG_PPC_ISERIES
  78         struct paca_struct *lpaca = get_paca();
  79         int cur_dec;
  80
  81         if (lpaca->lppaca.shared_proc) {
  82                 lpaca->lppaca.virtual_decr = val;
  83                 cur_dec = get_dec();
  84                 if (cur_dec > val)
  85                         HvCall_setVirtualDecr();
  86         } else
  87 #endif
  88                 mtspr(SPRN_DEC, val);
  89 }
  90
  91 static inline unsigned long tb_ticks_since(unsigned long tstamp)
  92 {
  93         return get_tb() - tstamp;
  94 }
  95
  96 #define mulhwu(x,y) \
  97 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
  98 #define mulhdu(x,y) \
  99 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 100
 101
 102 unsigned mulhwu_scale_factor(unsigned, unsigned);
 103 void div128_by_32( unsigned long dividend_high, unsigned long dividend_low,
 104                    unsigned divisor, struct div_result *dr );
 105
 106 /* Used to store Processor Utilization register (purr) values */
 107
 108 struct cpu_usage {
 109         u64 current_tb;  /* Holds the current purr register values */
 110 };
 111
 112 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 113
 114 #endif /* __KERNEL__ */
 115 #endif /* __PPC64_TIME_H */