/* * 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/config.h> #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_PPC64 static inline u64 get_tb(void) { return mftb(); } #else static 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;}) #else extern 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_ACCOUNTING extern 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 */