1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* 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/types.h>
#include <linux/percpu.h>
#include <asm/processor.h>
#ifdef CONFIG_PPC_ISERIES
#include <asm/paca.h>
#include <asm/firmware.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;
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);
#ifdef CONFIG_RTC_CLASS
extern int __init rtc_class_hookup(void);
#endif
/* 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 (firmware_has_feature(FW_FEATURE_ISERIES) &&
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 /* __POWERPC_TIME_H */
|
