blob: c6c762cad8b0dff9a8fd98a5b88bee375ba03a29 [file] [log] [blame]
* Common time prototypes and such for all ppc machines.
* Written by Cort Dougan ( 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/config.h>
#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;
void generic_calibrate_decr(void);
void setup_default_decr(void);
/* Some sane defaults: 125 MHz timebase, 1GHz processor */
extern unsigned long ppc_proc_freq;
extern unsigned long ppc_tb_freq;
#define DEFAULT_TB_FREQ 125000000UL
* 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;
unsigned long tb_orig_stamp;
struct gettimeofday_struct {
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->lppaca.shared_proc) {
lpaca->lppaca.virtual_decr = val;
cur_dec = get_dec();
if (cur_dec > val)
} else
mtspr(SPRN_DEC, val);
static 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 );
/* Used to store Processor Utilization register (purr) values */
struct cpu_usage {
u64 current_tb; /* Holds the current purr register values */
DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
#endif /* __KERNEL__ */
#endif /* __PPC64_TIME_H */