Commit | Line | Data |
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1da177e4 LT |
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 */ | |
26 | extern unsigned long tb_ticks_per_jiffy; | |
27 | extern unsigned long tb_ticks_per_usec; | |
28 | extern unsigned long tb_ticks_per_sec; | |
29 | extern unsigned long tb_to_xs; | |
30 | extern unsigned tb_to_us; | |
31 | extern unsigned long tb_last_stamp; | |
32 | ||
33 | struct rtc_time; | |
34 | extern void to_tm(int tim, struct rtc_time * tm); | |
35 | extern time_t last_rtc_update; | |
36 | ||
37 | /* | |
38 | * By putting all of this stuff into a single struct we | |
39 | * reduce the number of cache lines touched by do_gettimeofday. | |
40 | * Both by collecting all of the data in one cache line and | |
41 | * by touching only one TOC entry | |
42 | */ | |
43 | struct gettimeofday_vars { | |
44 | unsigned long tb_to_xs; | |
45 | unsigned long stamp_xsec; | |
46 | unsigned long tb_orig_stamp; | |
47 | }; | |
48 | ||
49 | struct gettimeofday_struct { | |
50 | unsigned long tb_ticks_per_sec; | |
51 | struct gettimeofday_vars vars[2]; | |
52 | struct gettimeofday_vars * volatile varp; | |
53 | unsigned var_idx; | |
54 | unsigned tb_to_us; | |
55 | }; | |
56 | ||
57 | struct div_result { | |
58 | unsigned long result_high; | |
59 | unsigned long result_low; | |
60 | }; | |
61 | ||
62 | int via_calibrate_decr(void); | |
63 | ||
64 | static __inline__ unsigned long get_tb(void) | |
65 | { | |
66 | return mftb(); | |
67 | } | |
68 | ||
69 | /* Accessor functions for the decrementer register. */ | |
70 | static __inline__ unsigned int get_dec(void) | |
71 | { | |
72 | return (mfspr(SPRN_DEC)); | |
73 | } | |
74 | ||
75 | static __inline__ void set_dec(int val) | |
76 | { | |
77 | #ifdef CONFIG_PPC_ISERIES | |
78 | struct paca_struct *lpaca = get_paca(); | |
79 | int cur_dec; | |
80 | ||
81 | if (lpaca->lppaca.shared_proc) { | |
82 | lpaca->lppaca.virtual_decr = val; | |
83 | cur_dec = get_dec(); | |
84 | if (cur_dec > val) | |
85 | HvCall_setVirtualDecr(); | |
86 | } else | |
87 | #endif | |
88 | mtspr(SPRN_DEC, val); | |
89 | } | |
90 | ||
91 | static inline unsigned long tb_ticks_since(unsigned long tstamp) | |
92 | { | |
93 | return get_tb() - tstamp; | |
94 | } | |
95 | ||
96 | #define mulhwu(x,y) \ | |
97 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
98 | #define mulhdu(x,y) \ | |
99 | ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
100 | ||
101 | ||
102 | unsigned mulhwu_scale_factor(unsigned, unsigned); | |
103 | void div128_by_32( unsigned long dividend_high, unsigned long dividend_low, | |
104 | unsigned divisor, struct div_result *dr ); | |
105 | ||
106 | /* Used to store Processor Utilization register (purr) values */ | |
107 | ||
108 | struct cpu_usage { | |
109 | u64 current_tb; /* Holds the current purr register values */ | |
110 | }; | |
111 | ||
112 | DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
113 | ||
114 | #endif /* __KERNEL__ */ | |
115 | #endif /* __PPC64_TIME_H */ |