/* * Common time prototypes and such for all ppc machines. * * Written by Cort Dougan (cort@cs.nmt.edu) 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 __POWERPC_TIME_H#define __POWERPC_TIME_H #ifdef __KERNEL__#include <linux/types.h>#include <linux/percpu.h> #include <asm/processor.h>#ifdef CONFIG_PPC64#include <asm/paca.h>#include <asm/iseries/hv_call.h>#endif /* time.c */extern unsigned long tb_ticks_per_jiffy;extern unsigned long tb_ticks_per_usec;extern unsigned long tb_ticks_per_sec;extern u64 tb_to_xs;extern unsigned      tb_to_us;extern unsigned long tb_last_stamp;extern u64 tb_last_jiffy; DECLARE_PER_CPU(unsigned long, last_jiffy); struct rtc_time;extern void to_tm(int tim, struct rtc_time * tm);extern time_t last_rtc_update; extern void generic_calibrate_decr(void);extern void wakeup_decrementer(void);extern void snapshot_timebase(void); /* Some sane defaults: 125 MHz timebase, 1GHz processor */extern unsigned long ppc_proc_freq;#define DEFAULT_PROC_FREQ	(DEFAULT_TB_FREQ * 8)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 on ppc64. */struct gettimeofday_vars {	u64 tb_to_xs;	u64 stamp_xsec;	u64 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 {	u64 result_high;	u64 result_low;}; /* Accessor functions for the timebase (RTC on 601) registers. *//* If one day CONFIG_POWER is added just define __USE_RTC as 1 */#ifdef CONFIG_6xx#define __USE_RTC()	(!cpu_has_feature(CPU_FTR_USE_TB))#else#define __USE_RTC()	0#endif /* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */static inline unsigned long get_tbl(void){	unsigned long tbl; #if defined(CONFIG_403GCX)	asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));#else	asm volatile("mftb %0" : "=r" (tbl));#endif	return tbl;} static inline unsigned int get_tbu(void){	unsigned int tbu; #if defined(CONFIG_403GCX)	asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));#else	asm volatile("mftbu %0" : "=r" (tbu));#endif	return tbu;} static inline unsigned int get_rtcl(void){	unsigned int rtcl; 	asm volatile("mfrtcl %0" : "=r" (rtcl));	return rtcl;} static inline u64 get_rtc(void){	unsigned int hi, lo, hi2; 	do {		asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"			     : "=r" (hi), "=r" (lo), "=r" (hi2));	} while (hi2 != hi);	return (u64)hi * 1000000000 + lo;} #ifdef CONFIG_PPC64static inline u64 get_tb(void){	return mftb();}#elsestatic inline u64 get_tb(void){	unsigned int tbhi, tblo, tbhi2; 	do {		tbhi = get_tbu();		tblo = get_tbl();		tbhi2 = get_tbu();	} while (tbhi != tbhi2); 	return ((u64)tbhi << 32) | tblo;}#endif static inline void set_tb(unsigned int upper, unsigned int lower){	mtspr(SPRN_TBWL, 0);	mtspr(SPRN_TBWU, upper);	mtspr(SPRN_TBWL, lower);} /* Accessor functions for the decrementer register. * The 4xx doesn't even have a decrementer.  I tried to use the * generic timer interrupt code, which seems OK, with the 4xx PIT * in auto-reload mode.  The problem is PIT stops counting when it * hits zero.  If it would wrap, we could use it just like a decrementer. */static inline unsigned int get_dec(void){#if defined(CONFIG_40x)	return (mfspr(SPRN_PIT));#else	return (mfspr(SPRN_DEC));#endif} static inline void set_dec(int val){#if defined(CONFIG_40x)	return;		/* Have to let it auto-reload */#elif defined(CONFIG_8xx_CPU6)	set_dec_cpu6(val);#else#ifdef CONFIG_PPC_ISERIES	int cur_dec; 	if (get_lppaca()->shared_proc) {		get_lppaca()->virtual_decr = val;		cur_dec = get_dec();		if (cur_dec > val)			HvCall_setVirtualDecr();	} else#endif		mtspr(SPRN_DEC, val);#endif /* not 40x or 8xx_CPU6 */} static inline unsigned long tb_ticks_since(unsigned long tstamp){	if (__USE_RTC()) {		int delta = get_rtcl() - (unsigned int) tstamp;		return delta < 0 ? delta + 1000000000 : delta;	}	return get_tbl() - tstamp;} #define mulhwu(x,y) \({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) #ifdef CONFIG_PPC64#define mulhdu(x,y) \({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})#elseextern u64 mulhdu(u64, u64);#endif extern void smp_space_timers(unsigned int); extern unsigned mulhwu_scale_factor(unsigned, unsigned);extern void div128_by_32(u64 dividend_high, u64 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); #ifdef CONFIG_VIRT_CPU_ACCOUNTINGextern void account_process_vtime(struct task_struct *tsk);#else#define account_process_vtime(tsk)		do { } while (0)#endif #if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR)extern void calculate_steal_time(void);extern void snapshot_timebases(void);#else#define calculate_steal_time()			do { } while (0)#define snapshot_timebases()			do { } while (0)#endif #endif /* __KERNEL__ */#endif /* __PPC64_TIME_H */