2 * Common time prototypes and such for all ppc machines.
4 * Written by Cort Dougan (cort@cs.nmt.edu) to merge
5 * Paul Mackerras' version and mine for PReP and Pmac.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #ifndef __POWERPC_TIME_H
14 #define __POWERPC_TIME_H
17 #include <linux/config.h>
18 #include <linux/types.h>
19 #include <linux/percpu.h>
21 #include <asm/processor.h>
24 #include <asm/iseries/hv_call.h>
28 extern unsigned long tb_ticks_per_jiffy
;
29 extern unsigned long tb_ticks_per_usec
;
30 extern unsigned long tb_ticks_per_sec
;
32 extern unsigned tb_to_us
;
33 extern unsigned long tb_last_stamp
;
34 extern u64 tb_last_jiffy
;
36 DECLARE_PER_CPU(unsigned long, last_jiffy
);
39 extern void to_tm(int tim
, struct rtc_time
* tm
);
40 extern time_t last_rtc_update
;
42 extern void generic_calibrate_decr(void);
43 extern void wakeup_decrementer(void);
44 extern void snapshot_timebase(void);
46 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
47 extern unsigned long ppc_proc_freq
;
48 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
49 extern unsigned long ppc_tb_freq
;
50 #define DEFAULT_TB_FREQ 125000000UL
53 * By putting all of this stuff into a single struct we
54 * reduce the number of cache lines touched by do_gettimeofday.
55 * Both by collecting all of the data in one cache line and
56 * by touching only one TOC entry on ppc64.
58 struct gettimeofday_vars
{
64 struct gettimeofday_struct
{
65 unsigned long tb_ticks_per_sec
;
66 struct gettimeofday_vars vars
[2];
67 struct gettimeofday_vars
* volatile varp
;
77 /* Accessor functions for the timebase (RTC on 601) registers. */
78 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
80 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
85 /* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */
86 static inline unsigned long get_tbl(void)
90 #if defined(CONFIG_403GCX)
91 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl
));
93 asm volatile("mftb %0" : "=r" (tbl
));
98 static inline unsigned int get_tbu(void)
102 #if defined(CONFIG_403GCX)
103 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu
));
105 asm volatile("mftbu %0" : "=r" (tbu
));
110 static inline unsigned int get_rtcl(void)
114 asm volatile("mfrtcl %0" : "=r" (rtcl
));
118 static inline u64
get_rtc(void)
120 unsigned int hi
, lo
, hi2
;
123 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
124 : "=r" (hi
), "=r" (lo
), "=r" (hi2
));
126 return (u64
)hi
* 1000000000 + lo
;
130 static inline u64
get_tb(void)
135 static inline u64
get_tb(void)
137 unsigned int tbhi
, tblo
, tbhi2
;
143 } while (tbhi
!= tbhi2
);
145 return ((u64
)tbhi
<< 32) | tblo
;
149 static inline void set_tb(unsigned int upper
, unsigned int lower
)
152 mtspr(SPRN_TBWU
, upper
);
153 mtspr(SPRN_TBWL
, lower
);
156 /* Accessor functions for the decrementer register.
157 * The 4xx doesn't even have a decrementer. I tried to use the
158 * generic timer interrupt code, which seems OK, with the 4xx PIT
159 * in auto-reload mode. The problem is PIT stops counting when it
160 * hits zero. If it would wrap, we could use it just like a decrementer.
162 static inline unsigned int get_dec(void)
164 #if defined(CONFIG_40x)
165 return (mfspr(SPRN_PIT
));
167 return (mfspr(SPRN_DEC
));
171 static inline void set_dec(int val
)
173 #if defined(CONFIG_40x)
174 return; /* Have to let it auto-reload */
175 #elif defined(CONFIG_8xx_CPU6)
178 #ifdef CONFIG_PPC_ISERIES
181 if (get_lppaca()->shared_proc
) {
182 get_lppaca()->virtual_decr
= val
;
185 HvCall_setVirtualDecr();
188 mtspr(SPRN_DEC
, val
);
189 #endif /* not 40x or 8xx_CPU6 */
192 static inline unsigned long tb_ticks_since(unsigned long tstamp
)
195 int delta
= get_rtcl() - (unsigned int) tstamp
;
196 return delta
< 0 ? delta
+ 1000000000 : delta
;
198 return get_tbl() - tstamp
;
201 #define mulhwu(x,y) \
202 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
205 #define mulhdu(x,y) \
206 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
208 extern u64
mulhdu(u64
, u64
);
211 extern void smp_space_timers(unsigned int);
213 extern unsigned mulhwu_scale_factor(unsigned, unsigned);
214 extern void div128_by_32(u64 dividend_high
, u64 dividend_low
,
215 unsigned divisor
, struct div_result
*dr
);
217 /* Used to store Processor Utilization register (purr) values */
220 u64 current_tb
; /* Holds the current purr register values */
223 DECLARE_PER_CPU(struct cpu_usage
, cpu_usage_array
);
225 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
226 extern void account_process_vtime(struct task_struct
*tsk
);
228 #define account_process_vtime(tsk) do { } while (0)
231 #if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR)
232 extern void calculate_steal_time(void);
233 extern void snapshot_timebases(void);
235 #define calculate_steal_time() do { } while (0)
236 #define snapshot_timebases() do { } while (0)
239 #endif /* __KERNEL__ */
240 #endif /* __PPC64_TIME_H */