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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Common time prototypes and such for all ppc machines.
3 *
4 * Written by Cort Dougan (cort@cs.nmt.edu) to merge
5 * Paul Mackerras' version and mine for PReP and Pmac.
6 *
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.
11 */
12
13#ifndef __PPC64_TIME_H
14#define __PPC64_TIME_H
15
16#ifdef __KERNEL__
17#include <linux/config.h>
18#include <linux/types.h>
19#include <linux/mc146818rtc.h>
20
21#include <asm/processor.h>
22#include <asm/paca.h>
23#include <asm/iSeries/HvCall.h>
24
25/* time.c */
26extern unsigned long tb_ticks_per_jiffy;
27extern unsigned long tb_ticks_per_usec;
28extern unsigned long tb_ticks_per_sec;
29extern unsigned long tb_to_xs;
30extern unsigned tb_to_us;
31extern unsigned long tb_last_stamp;
32
33struct rtc_time;
34extern void to_tm(int tim, struct rtc_time * tm);
35extern time_t last_rtc_update;
36
37void generic_calibrate_decr(void);
38void setup_default_decr(void);
39
40/* Some sane defaults: 125 MHz timebase, 1GHz processor */
41extern unsigned long ppc_proc_freq;
42#define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
43extern unsigned long ppc_tb_freq;
44#define DEFAULT_TB_FREQ 125000000UL
45
46/*
47 * By putting all of this stuff into a single struct we
48 * reduce the number of cache lines touched by do_gettimeofday.
49 * Both by collecting all of the data in one cache line and
50 * by touching only one TOC entry
51 */
52struct gettimeofday_vars {
53 unsigned long tb_to_xs;
54 unsigned long stamp_xsec;
55 unsigned long tb_orig_stamp;
56};
57
58struct gettimeofday_struct {
59 unsigned long tb_ticks_per_sec;
60 struct gettimeofday_vars vars[2];
61 struct gettimeofday_vars * volatile varp;
62 unsigned var_idx;
63 unsigned tb_to_us;
64};
65
66struct div_result {
67 unsigned long result_high;
68 unsigned long result_low;
69};
70
71int via_calibrate_decr(void);
72
73static __inline__ unsigned long get_tb(void)
74{
75 return mftb();
76}
77
78/* Accessor functions for the decrementer register. */
79static __inline__ unsigned int get_dec(void)
80{
81 return (mfspr(SPRN_DEC));
82}
83
84static __inline__ void set_dec(int val)
85{
86#ifdef CONFIG_PPC_ISERIES
87 struct paca_struct *lpaca = get_paca();
88 int cur_dec;
89
90 if (lpaca->lppaca.shared_proc) {
91 lpaca->lppaca.virtual_decr = val;
92 cur_dec = get_dec();
93 if (cur_dec > val)
94 HvCall_setVirtualDecr();
95 } else
96#endif
97 mtspr(SPRN_DEC, val);
98}
99
100static inline unsigned long tb_ticks_since(unsigned long tstamp)
101{
102 return get_tb() - tstamp;
103}
104
105#define mulhwu(x,y) \
106({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
107#define mulhdu(x,y) \
108({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
109
110
111unsigned mulhwu_scale_factor(unsigned, unsigned);
112void div128_by_32( unsigned long dividend_high, unsigned long dividend_low,
113 unsigned divisor, struct div_result *dr );
114
115/* Used to store Processor Utilization register (purr) values */
116
117struct cpu_usage {
118 u64 current_tb; /* Holds the current purr register values */
119};
120
121DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
122
123#endif /* __KERNEL__ */
124#endif /* __PPC64_TIME_H */