ACPI: fix OSC regression that caused aer and pciehp not to load
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / time.h
blobfe04e5ef6a592ebddf885b2f313323ec5226e452
1 #ifndef _LINUX_TIME_H
2 #define _LINUX_TIME_H
4 #include <linux/types.h>
6 #ifdef __KERNEL__
7 # include <linux/cache.h>
8 # include <linux/seqlock.h>
9 # include <linux/math64.h>
10 #endif
12 #ifndef _STRUCT_TIMESPEC
13 #define _STRUCT_TIMESPEC
14 struct timespec {
15 __kernel_time_t tv_sec; /* seconds */
16 long tv_nsec; /* nanoseconds */
18 #endif
20 struct timeval {
21 __kernel_time_t tv_sec; /* seconds */
22 __kernel_suseconds_t tv_usec; /* microseconds */
25 struct timezone {
26 int tz_minuteswest; /* minutes west of Greenwich */
27 int tz_dsttime; /* type of dst correction */
30 #ifdef __KERNEL__
32 extern struct timezone sys_tz;
34 /* Parameters used to convert the timespec values: */
35 #define MSEC_PER_SEC 1000L
36 #define USEC_PER_MSEC 1000L
37 #define NSEC_PER_USEC 1000L
38 #define NSEC_PER_MSEC 1000000L
39 #define USEC_PER_SEC 1000000L
40 #define NSEC_PER_SEC 1000000000L
41 #define FSEC_PER_SEC 1000000000000000L
43 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
45 static inline int timespec_equal(const struct timespec *a,
46 const struct timespec *b)
48 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
52 * lhs < rhs: return <0
53 * lhs == rhs: return 0
54 * lhs > rhs: return >0
56 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
58 if (lhs->tv_sec < rhs->tv_sec)
59 return -1;
60 if (lhs->tv_sec > rhs->tv_sec)
61 return 1;
62 return lhs->tv_nsec - rhs->tv_nsec;
65 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
67 if (lhs->tv_sec < rhs->tv_sec)
68 return -1;
69 if (lhs->tv_sec > rhs->tv_sec)
70 return 1;
71 return lhs->tv_usec - rhs->tv_usec;
74 extern unsigned long mktime(const unsigned int year, const unsigned int mon,
75 const unsigned int day, const unsigned int hour,
76 const unsigned int min, const unsigned int sec);
78 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
79 extern struct timespec timespec_add_safe(const struct timespec lhs,
80 const struct timespec rhs);
83 * sub = lhs - rhs, in normalized form
85 static inline struct timespec timespec_sub(struct timespec lhs,
86 struct timespec rhs)
88 struct timespec ts_delta;
89 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
90 lhs.tv_nsec - rhs.tv_nsec);
91 return ts_delta;
95 * Returns true if the timespec is norm, false if denorm:
97 #define timespec_valid(ts) \
98 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
100 extern struct timespec xtime;
101 extern struct timespec wall_to_monotonic;
102 extern seqlock_t xtime_lock;
104 extern void read_persistent_clock(struct timespec *ts);
105 extern void read_boot_clock(struct timespec *ts);
106 extern int update_persistent_clock(struct timespec now);
107 extern int no_sync_cmos_clock __read_mostly;
108 void timekeeping_init(void);
109 extern int timekeeping_suspended;
111 unsigned long get_seconds(void);
112 struct timespec current_kernel_time(void);
113 struct timespec __current_kernel_time(void); /* does not hold xtime_lock */
114 struct timespec get_monotonic_coarse(void);
116 #define CURRENT_TIME (current_kernel_time())
117 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
119 /* Some architectures do not supply their own clocksource.
120 * This is mainly the case in architectures that get their
121 * inter-tick times by reading the counter on their interval
122 * timer. Since these timers wrap every tick, they're not really
123 * useful as clocksources. Wrapping them to act like one is possible
124 * but not very efficient. So we provide a callout these arches
125 * can implement for use with the jiffies clocksource to provide
126 * finer then tick granular time.
128 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
129 extern u32 arch_gettimeoffset(void);
130 #else
131 static inline u32 arch_gettimeoffset(void) { return 0; }
132 #endif
134 extern void do_gettimeofday(struct timeval *tv);
135 extern int do_settimeofday(struct timespec *tv);
136 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
137 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
138 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
139 struct itimerval;
140 extern int do_setitimer(int which, struct itimerval *value,
141 struct itimerval *ovalue);
142 extern unsigned int alarm_setitimer(unsigned int seconds);
143 extern int do_getitimer(int which, struct itimerval *value);
144 extern void getnstimeofday(struct timespec *tv);
145 extern void getrawmonotonic(struct timespec *ts);
146 extern void getboottime(struct timespec *ts);
147 extern void monotonic_to_bootbased(struct timespec *ts);
149 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
150 extern int timekeeping_valid_for_hres(void);
151 extern void update_wall_time(void);
152 extern void update_xtime_cache(u64 nsec);
153 extern void timekeeping_leap_insert(int leapsecond);
155 struct tms;
156 extern void do_sys_times(struct tms *);
159 * Similar to the struct tm in userspace <time.h>, but it needs to be here so
160 * that the kernel source is self contained.
162 struct tm {
164 * the number of seconds after the minute, normally in the range
165 * 0 to 59, but can be up to 60 to allow for leap seconds
167 int tm_sec;
168 /* the number of minutes after the hour, in the range 0 to 59*/
169 int tm_min;
170 /* the number of hours past midnight, in the range 0 to 23 */
171 int tm_hour;
172 /* the day of the month, in the range 1 to 31 */
173 int tm_mday;
174 /* the number of months since January, in the range 0 to 11 */
175 int tm_mon;
176 /* the number of years since 1900 */
177 long tm_year;
178 /* the number of days since Sunday, in the range 0 to 6 */
179 int tm_wday;
180 /* the number of days since January 1, in the range 0 to 365 */
181 int tm_yday;
184 void time_to_tm(time_t totalsecs, int offset, struct tm *result);
187 * timespec_to_ns - Convert timespec to nanoseconds
188 * @ts: pointer to the timespec variable to be converted
190 * Returns the scalar nanosecond representation of the timespec
191 * parameter.
193 static inline s64 timespec_to_ns(const struct timespec *ts)
195 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
199 * timeval_to_ns - Convert timeval to nanoseconds
200 * @ts: pointer to the timeval variable to be converted
202 * Returns the scalar nanosecond representation of the timeval
203 * parameter.
205 static inline s64 timeval_to_ns(const struct timeval *tv)
207 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
208 tv->tv_usec * NSEC_PER_USEC;
212 * ns_to_timespec - Convert nanoseconds to timespec
213 * @nsec: the nanoseconds value to be converted
215 * Returns the timespec representation of the nsec parameter.
217 extern struct timespec ns_to_timespec(const s64 nsec);
220 * ns_to_timeval - Convert nanoseconds to timeval
221 * @nsec: the nanoseconds value to be converted
223 * Returns the timeval representation of the nsec parameter.
225 extern struct timeval ns_to_timeval(const s64 nsec);
228 * timespec_add_ns - Adds nanoseconds to a timespec
229 * @a: pointer to timespec to be incremented
230 * @ns: unsigned nanoseconds value to be added
232 * This must always be inlined because its used from the x86-64 vdso,
233 * which cannot call other kernel functions.
235 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
237 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
238 a->tv_nsec = ns;
240 #endif /* __KERNEL__ */
242 #define NFDBITS __NFDBITS
244 #define FD_SETSIZE __FD_SETSIZE
245 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
246 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
247 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
248 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
251 * Names of the interval timers, and structure
252 * defining a timer setting:
254 #define ITIMER_REAL 0
255 #define ITIMER_VIRTUAL 1
256 #define ITIMER_PROF 2
258 struct itimerspec {
259 struct timespec it_interval; /* timer period */
260 struct timespec it_value; /* timer expiration */
263 struct itimerval {
264 struct timeval it_interval; /* timer interval */
265 struct timeval it_value; /* current value */
269 * The IDs of the various system clocks (for POSIX.1b interval timers):
271 #define CLOCK_REALTIME 0
272 #define CLOCK_MONOTONIC 1
273 #define CLOCK_PROCESS_CPUTIME_ID 2
274 #define CLOCK_THREAD_CPUTIME_ID 3
275 #define CLOCK_MONOTONIC_RAW 4
276 #define CLOCK_REALTIME_COARSE 5
277 #define CLOCK_MONOTONIC_COARSE 6
280 * The IDs of various hardware clocks:
282 #define CLOCK_SGI_CYCLE 10
283 #define MAX_CLOCKS 16
284 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
285 #define CLOCKS_MONO CLOCK_MONOTONIC
288 * The various flags for setting POSIX.1b interval timers:
290 #define TIMER_ABSTIME 0x01
292 #endif