125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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* Common time prototypes and such for all ppc machines.
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*
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* Written by Cort Dougan (cort@cs.nmt.edu) to merge
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* Paul Mackerras' version and mine for PReP and Pmac.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef __PPC64_TIME_H
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#define __PPC64_TIME_H
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#ifdef __KERNEL__
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/mc146818rtc.h>
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#include <asm/processor.h>
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#include <asm/paca.h>
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#include <asm/iSeries/HvCall.h>
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/* time.c */
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extern unsigned long tb_ticks_per_jiffy;
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extern unsigned long tb_ticks_per_usec;
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extern unsigned long tb_ticks_per_sec;
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extern unsigned long tb_to_xs;
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extern unsigned tb_to_us;
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extern unsigned long tb_last_stamp;
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struct rtc_time;
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extern void to_tm(int tim, struct rtc_time * tm);
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extern time_t last_rtc_update;
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void generic_calibrate_decr(void);
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void setup_default_decr(void);
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/* Some sane defaults: 125 MHz timebase, 1GHz processor */
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extern unsigned long ppc_proc_freq;
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#define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
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extern unsigned long ppc_tb_freq;
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#define DEFAULT_TB_FREQ 125000000UL
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/*
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* By putting all of this stuff into a single struct we
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* reduce the number of cache lines touched by do_gettimeofday.
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* Both by collecting all of the data in one cache line and
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* by touching only one TOC entry
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*/
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struct gettimeofday_vars {
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unsigned long tb_to_xs;
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unsigned long stamp_xsec;
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unsigned long tb_orig_stamp;
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};
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struct gettimeofday_struct {
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unsigned long tb_ticks_per_sec;
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struct gettimeofday_vars vars[2];
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struct gettimeofday_vars * volatile varp;
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unsigned var_idx;
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unsigned tb_to_us;
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};
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struct div_result {
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unsigned long result_high;
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unsigned long result_low;
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};
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int via_calibrate_decr(void);
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static __inline__ unsigned long get_tb(void)
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{
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return mftb();
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}
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/* Accessor functions for the decrementer register. */
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static __inline__ unsigned int get_dec(void)
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{
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return (mfspr(SPRN_DEC));
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}
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static __inline__ void set_dec(int val)
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{
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#ifdef CONFIG_PPC_ISERIES
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struct paca_struct *lpaca = get_paca();
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int cur_dec;
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if (lpaca->lppaca.shared_proc) {
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lpaca->lppaca.virtual_decr = val;
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cur_dec = get_dec();
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if (cur_dec > val)
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HvCall_setVirtualDecr();
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} else
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#endif
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mtspr(SPRN_DEC, val);
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}
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static inline unsigned long tb_ticks_since(unsigned long tstamp)
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{
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return get_tb() - tstamp;
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}
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#define mulhwu(x,y) \
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({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
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#define mulhdu(x,y) \
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({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
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unsigned mulhwu_scale_factor(unsigned, unsigned);
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void div128_by_32( unsigned long dividend_high, unsigned long dividend_low,
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unsigned divisor, struct div_result *dr );
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/* Used to store Processor Utilization register (purr) values */
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struct cpu_usage {
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u64 current_tb; /* Holds the current purr register values */
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};
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DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
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#endif /* __KERNEL__ */
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#endif /* __PPC64_TIME_H */
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