diff options
Diffstat (limited to 'include/asm-ppc64/time.h')
| -rw-r--r-- | include/asm-ppc64/time.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/include/asm-ppc64/time.h b/include/asm-ppc64/time.h new file mode 100644 index 000000000000..8d6e3760ee10 --- /dev/null +++ b/include/asm-ppc64/time.h @@ -0,0 +1,115 @@ +/* + * 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 __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; + +/* + * 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) +{ +#ifdef CONFIG_PPC_ISERIES + 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) + HvCall_setVirtualDecr(); + } else +#endif + 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 */ |