Root/
1 | #ifndef _LINUX_TIME_H |
2 | #define _LINUX_TIME_H |
3 | |
4 | # include <linux/cache.h> |
5 | # include <linux/seqlock.h> |
6 | # include <linux/math64.h> |
7 | #include <uapi/linux/time.h> |
8 | |
9 | extern struct timezone sys_tz; |
10 | |
11 | /* Parameters used to convert the timespec values: */ |
12 | #define MSEC_PER_SEC 1000L |
13 | #define USEC_PER_MSEC 1000L |
14 | #define NSEC_PER_USEC 1000L |
15 | #define NSEC_PER_MSEC 1000000L |
16 | #define USEC_PER_SEC 1000000L |
17 | #define NSEC_PER_SEC 1000000000L |
18 | #define FSEC_PER_SEC 1000000000000000LL |
19 | |
20 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) |
21 | |
22 | static inline int timespec_equal(const struct timespec *a, |
23 | const struct timespec *b) |
24 | { |
25 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
26 | } |
27 | |
28 | /* |
29 | * lhs < rhs: return <0 |
30 | * lhs == rhs: return 0 |
31 | * lhs > rhs: return >0 |
32 | */ |
33 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
34 | { |
35 | if (lhs->tv_sec < rhs->tv_sec) |
36 | return -1; |
37 | if (lhs->tv_sec > rhs->tv_sec) |
38 | return 1; |
39 | return lhs->tv_nsec - rhs->tv_nsec; |
40 | } |
41 | |
42 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
43 | { |
44 | if (lhs->tv_sec < rhs->tv_sec) |
45 | return -1; |
46 | if (lhs->tv_sec > rhs->tv_sec) |
47 | return 1; |
48 | return lhs->tv_usec - rhs->tv_usec; |
49 | } |
50 | |
51 | extern unsigned long mktime(const unsigned int year, const unsigned int mon, |
52 | const unsigned int day, const unsigned int hour, |
53 | const unsigned int min, const unsigned int sec); |
54 | |
55 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec); |
56 | |
57 | /* |
58 | * timespec_add_safe assumes both values are positive and checks |
59 | * for overflow. It will return TIME_T_MAX if the reutrn would be |
60 | * smaller then either of the arguments. |
61 | */ |
62 | extern struct timespec timespec_add_safe(const struct timespec lhs, |
63 | const struct timespec rhs); |
64 | |
65 | |
66 | static inline struct timespec timespec_add(struct timespec lhs, |
67 | struct timespec rhs) |
68 | { |
69 | struct timespec ts_delta; |
70 | set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec, |
71 | lhs.tv_nsec + rhs.tv_nsec); |
72 | return ts_delta; |
73 | } |
74 | |
75 | /* |
76 | * sub = lhs - rhs, in normalized form |
77 | */ |
78 | static inline struct timespec timespec_sub(struct timespec lhs, |
79 | struct timespec rhs) |
80 | { |
81 | struct timespec ts_delta; |
82 | set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, |
83 | lhs.tv_nsec - rhs.tv_nsec); |
84 | return ts_delta; |
85 | } |
86 | |
87 | #define KTIME_MAX ((s64)~((u64)1 << 63)) |
88 | #if (BITS_PER_LONG == 64) |
89 | # define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) |
90 | #else |
91 | # define KTIME_SEC_MAX LONG_MAX |
92 | #endif |
93 | |
94 | /* |
95 | * Returns true if the timespec is norm, false if denorm: |
96 | */ |
97 | static inline bool timespec_valid(const struct timespec *ts) |
98 | { |
99 | /* Dates before 1970 are bogus */ |
100 | if (ts->tv_sec < 0) |
101 | return false; |
102 | /* Can't have more nanoseconds then a second */ |
103 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) |
104 | return false; |
105 | return true; |
106 | } |
107 | |
108 | static inline bool timespec_valid_strict(const struct timespec *ts) |
109 | { |
110 | if (!timespec_valid(ts)) |
111 | return false; |
112 | /* Disallow values that could overflow ktime_t */ |
113 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) |
114 | return false; |
115 | return true; |
116 | } |
117 | |
118 | extern bool persistent_clock_exist; |
119 | |
120 | #ifdef ALWAYS_USE_PERSISTENT_CLOCK |
121 | #define has_persistent_clock() true |
122 | #else |
123 | static inline bool has_persistent_clock(void) |
124 | { |
125 | return persistent_clock_exist; |
126 | } |
127 | #endif |
128 | |
129 | extern void read_persistent_clock(struct timespec *ts); |
130 | extern void read_boot_clock(struct timespec *ts); |
131 | extern int persistent_clock_is_local; |
132 | extern int update_persistent_clock(struct timespec now); |
133 | void timekeeping_init(void); |
134 | extern int timekeeping_suspended; |
135 | |
136 | unsigned long get_seconds(void); |
137 | struct timespec current_kernel_time(void); |
138 | struct timespec __current_kernel_time(void); /* does not take xtime_lock */ |
139 | struct timespec get_monotonic_coarse(void); |
140 | void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, |
141 | struct timespec *wtom, struct timespec *sleep); |
142 | void timekeeping_inject_sleeptime(struct timespec *delta); |
143 | |
144 | #define CURRENT_TIME (current_kernel_time()) |
145 | #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) |
146 | |
147 | /* Some architectures do not supply their own clocksource. |
148 | * This is mainly the case in architectures that get their |
149 | * inter-tick times by reading the counter on their interval |
150 | * timer. Since these timers wrap every tick, they're not really |
151 | * useful as clocksources. Wrapping them to act like one is possible |
152 | * but not very efficient. So we provide a callout these arches |
153 | * can implement for use with the jiffies clocksource to provide |
154 | * finer then tick granular time. |
155 | */ |
156 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
157 | extern u32 (*arch_gettimeoffset)(void); |
158 | #endif |
159 | |
160 | extern void do_gettimeofday(struct timeval *tv); |
161 | extern int do_settimeofday(const struct timespec *tv); |
162 | extern int do_sys_settimeofday(const struct timespec *tv, |
163 | const struct timezone *tz); |
164 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
165 | extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); |
166 | struct itimerval; |
167 | extern int do_setitimer(int which, struct itimerval *value, |
168 | struct itimerval *ovalue); |
169 | extern unsigned int alarm_setitimer(unsigned int seconds); |
170 | extern int do_getitimer(int which, struct itimerval *value); |
171 | extern int __getnstimeofday(struct timespec *tv); |
172 | extern void getnstimeofday(struct timespec *tv); |
173 | extern void getrawmonotonic(struct timespec *ts); |
174 | extern void getnstime_raw_and_real(struct timespec *ts_raw, |
175 | struct timespec *ts_real); |
176 | extern void getboottime(struct timespec *ts); |
177 | extern void monotonic_to_bootbased(struct timespec *ts); |
178 | extern void get_monotonic_boottime(struct timespec *ts); |
179 | |
180 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); |
181 | extern int timekeeping_valid_for_hres(void); |
182 | extern u64 timekeeping_max_deferment(void); |
183 | extern int timekeeping_inject_offset(struct timespec *ts); |
184 | |
185 | struct tms; |
186 | extern void do_sys_times(struct tms *); |
187 | |
188 | /* |
189 | * Similar to the struct tm in userspace <time.h>, but it needs to be here so |
190 | * that the kernel source is self contained. |
191 | */ |
192 | struct tm { |
193 | /* |
194 | * the number of seconds after the minute, normally in the range |
195 | * 0 to 59, but can be up to 60 to allow for leap seconds |
196 | */ |
197 | int tm_sec; |
198 | /* the number of minutes after the hour, in the range 0 to 59*/ |
199 | int tm_min; |
200 | /* the number of hours past midnight, in the range 0 to 23 */ |
201 | int tm_hour; |
202 | /* the day of the month, in the range 1 to 31 */ |
203 | int tm_mday; |
204 | /* the number of months since January, in the range 0 to 11 */ |
205 | int tm_mon; |
206 | /* the number of years since 1900 */ |
207 | long tm_year; |
208 | /* the number of days since Sunday, in the range 0 to 6 */ |
209 | int tm_wday; |
210 | /* the number of days since January 1, in the range 0 to 365 */ |
211 | int tm_yday; |
212 | }; |
213 | |
214 | void time_to_tm(time_t totalsecs, int offset, struct tm *result); |
215 | |
216 | /** |
217 | * timespec_to_ns - Convert timespec to nanoseconds |
218 | * @ts: pointer to the timespec variable to be converted |
219 | * |
220 | * Returns the scalar nanosecond representation of the timespec |
221 | * parameter. |
222 | */ |
223 | static inline s64 timespec_to_ns(const struct timespec *ts) |
224 | { |
225 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
226 | } |
227 | |
228 | /** |
229 | * timeval_to_ns - Convert timeval to nanoseconds |
230 | * @ts: pointer to the timeval variable to be converted |
231 | * |
232 | * Returns the scalar nanosecond representation of the timeval |
233 | * parameter. |
234 | */ |
235 | static inline s64 timeval_to_ns(const struct timeval *tv) |
236 | { |
237 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
238 | tv->tv_usec * NSEC_PER_USEC; |
239 | } |
240 | |
241 | /** |
242 | * ns_to_timespec - Convert nanoseconds to timespec |
243 | * @nsec: the nanoseconds value to be converted |
244 | * |
245 | * Returns the timespec representation of the nsec parameter. |
246 | */ |
247 | extern struct timespec ns_to_timespec(const s64 nsec); |
248 | |
249 | /** |
250 | * ns_to_timeval - Convert nanoseconds to timeval |
251 | * @nsec: the nanoseconds value to be converted |
252 | * |
253 | * Returns the timeval representation of the nsec parameter. |
254 | */ |
255 | extern struct timeval ns_to_timeval(const s64 nsec); |
256 | |
257 | /** |
258 | * timespec_add_ns - Adds nanoseconds to a timespec |
259 | * @a: pointer to timespec to be incremented |
260 | * @ns: unsigned nanoseconds value to be added |
261 | * |
262 | * This must always be inlined because its used from the x86-64 vdso, |
263 | * which cannot call other kernel functions. |
264 | */ |
265 | static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) |
266 | { |
267 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); |
268 | a->tv_nsec = ns; |
269 | } |
270 | |
271 | #endif |
272 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9