LXR linux-old/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/types.h>
  18#include <linux/mc146818rtc.h>
  19
  20#include <asm/processor.h>
  21#include <asm/paca.h>
  22#include <asm/iSeries/HvCall.h>
  23
  24/* time.c */
  25extern unsigned long tb_ticks_per_jiffy;
  26extern unsigned long tb_ticks_per_usec;
  27extern unsigned long tb_ticks_per_sec;
  28extern unsigned long tb_to_xs;
  29extern unsigned long tb_last_stamp;
  30
  31struct rtc_time;
  32extern void to_tm(int tim, struct rtc_time * tm);
  33extern time_t last_rtc_update;
  34
  35struct div_result {
  36        unsigned long result_high;
  37        unsigned long result_low;
  38};
  39
  40int via_calibrate_decr(void);
  41
  42static __inline__ unsigned long get_tb(void)
  43{
  44        return mftb();
  45}
  46
  47/* Accessor functions for the decrementer register. */
  48static __inline__ unsigned int get_dec(void)
  49{
  50        return (mfspr(SPRN_DEC));
  51}
  52
  53static __inline__ void set_dec(int val)
  54{
  55#ifdef CONFIG_PPC_ISERIES
  56        struct paca_struct *lpaca = get_paca();
  57        int cur_dec;
  58
  59        if (lpaca->xLpPaca.xSharedProc) {
  60                lpaca->xLpPaca.xVirtualDecr = val;
  61                cur_dec = get_dec();
  62                lpaca->xLpPaca.xSavedDecr = cur_dec;
  63                if (cur_dec > val)
  64                        HvCall_setVirtualDecr();
  65        } else
  66#endif
  67                mtspr(SPRN_DEC, val);
  68}
  69
  70static inline unsigned long tb_ticks_since(unsigned long tstamp)
  71{
  72        return get_tb() - tstamp;
  73}
  74
  75#define mulhdu(x,y) \
  76({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
  77
  78void div128_by_32( unsigned long dividend_high, unsigned long dividend_low,
  79                   unsigned divisor, struct div_result *dr );
  80#endif /* __KERNEL__ */
  81#endif /* __PPC64_TIME_H */
  82