1 #ifndef _LINUX_TIME64_H 2 #define _LINUX_TIME64_H 3 4 #include <uapi/linux/time.h> 5 #include <linux/math64.h> 6 7 typedef __s64 time64_t; 8 9 /* 10 * This wants to go into uapi/linux/time.h once we agreed about the 11 * userspace interfaces. 12 */ 13 #if __BITS_PER_LONG == 64 14 # define timespec64 timespec 15 #define itimerspec64 itimerspec 16 #else 17 struct timespec64 { 18 time64_t tv_sec; /* seconds */ 19 long tv_nsec; /* nanoseconds */ 20 }; 21 22 struct itimerspec64 { 23 struct timespec64 it_interval; 24 struct timespec64 it_value; 25 }; 26 27 #endif 28 29 /* Parameters used to convert the timespec values: */ 30 #define MSEC_PER_SEC 1000L 31 #define USEC_PER_MSEC 1000L 32 #define NSEC_PER_USEC 1000L 33 #define NSEC_PER_MSEC 1000000L 34 #define USEC_PER_SEC 1000000L 35 #define NSEC_PER_SEC 1000000000L 36 #define FSEC_PER_SEC 1000000000000000LL 37 38 /* Located here for timespec[64]_valid_strict */ 39 #define TIME64_MAX ((s64)~((u64)1 << 63)) 40 #define KTIME_MAX ((s64)~((u64)1 << 63)) 41 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) 42 43 #if __BITS_PER_LONG == 64 44 45 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) 46 { 47 return ts64; 48 } 49 50 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) 51 { 52 return ts; 53 } 54 55 static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) 56 { 57 return *its64; 58 } 59 60 static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) 61 { 62 return *its; 63 } 64 65 # define timespec64_equal timespec_equal 66 # define timespec64_compare timespec_compare 67 # define set_normalized_timespec64 set_normalized_timespec 68 # define timespec64_add timespec_add 69 # define timespec64_sub timespec_sub 70 # define timespec64_valid timespec_valid 71 # define timespec64_valid_strict timespec_valid_strict 72 # define timespec64_to_ns timespec_to_ns 73 # define ns_to_timespec64 ns_to_timespec 74 # define timespec64_add_ns timespec_add_ns 75 76 #else 77 78 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) 79 { 80 struct timespec ret; 81 82 ret.tv_sec = (time_t)ts64.tv_sec; 83 ret.tv_nsec = ts64.tv_nsec; 84 return ret; 85 } 86 87 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) 88 { 89 struct timespec64 ret; 90 91 ret.tv_sec = ts.tv_sec; 92 ret.tv_nsec = ts.tv_nsec; 93 return ret; 94 } 95 96 static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) 97 { 98 struct itimerspec ret; 99 100 ret.it_interval = timespec64_to_timespec(its64->it_interval); 101 ret.it_value = timespec64_to_timespec(its64->it_value); 102 return ret; 103 } 104 105 static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) 106 { 107 struct itimerspec64 ret; 108 109 ret.it_interval = timespec_to_timespec64(its->it_interval); 110 ret.it_value = timespec_to_timespec64(its->it_value); 111 return ret; 112 } 113 114 static inline int timespec64_equal(const struct timespec64 *a, 115 const struct timespec64 *b) 116 { 117 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 118 } 119 120 /* 121 * lhs < rhs: return <0 122 * lhs == rhs: return 0 123 * lhs > rhs: return >0 124 */ 125 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) 126 { 127 if (lhs->tv_sec < rhs->tv_sec) 128 return -1; 129 if (lhs->tv_sec > rhs->tv_sec) 130 return 1; 131 return lhs->tv_nsec - rhs->tv_nsec; 132 } 133 134 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); 135 136 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 137 struct timespec64 rhs) 138 { 139 struct timespec64 ts_delta; 140 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 141 lhs.tv_nsec + rhs.tv_nsec); 142 return ts_delta; 143 } 144 145 /* 146 * sub = lhs - rhs, in normalized form 147 */ 148 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 149 struct timespec64 rhs) 150 { 151 struct timespec64 ts_delta; 152 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 153 lhs.tv_nsec - rhs.tv_nsec); 154 return ts_delta; 155 } 156 157 /* 158 * Returns true if the timespec64 is norm, false if denorm: 159 */ 160 static inline bool timespec64_valid(const struct timespec64 *ts) 161 { 162 /* Dates before 1970 are bogus */ 163 if (ts->tv_sec < 0) 164 return false; 165 /* Can't have more nanoseconds then a second */ 166 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 167 return false; 168 return true; 169 } 170 171 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 172 { 173 if (!timespec64_valid(ts)) 174 return false; 175 /* Disallow values that could overflow ktime_t */ 176 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 177 return false; 178 return true; 179 } 180 181 /** 182 * timespec64_to_ns - Convert timespec64 to nanoseconds 183 * @ts: pointer to the timespec64 variable to be converted 184 * 185 * Returns the scalar nanosecond representation of the timespec64 186 * parameter. 187 */ 188 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 189 { 190 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 191 } 192 193 /** 194 * ns_to_timespec64 - Convert nanoseconds to timespec64 195 * @nsec: the nanoseconds value to be converted 196 * 197 * Returns the timespec64 representation of the nsec parameter. 198 */ 199 extern struct timespec64 ns_to_timespec64(const s64 nsec); 200 201 /** 202 * timespec64_add_ns - Adds nanoseconds to a timespec64 203 * @a: pointer to timespec64 to be incremented 204 * @ns: unsigned nanoseconds value to be added 205 * 206 * This must always be inlined because its used from the x86-64 vdso, 207 * which cannot call other kernel functions. 208 */ 209 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 210 { 211 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 212 a->tv_nsec = ns; 213 } 214 215 #endif 216 217 /* 218 * timespec64_add_safe assumes both values are positive and checks for 219 * overflow. It will return TIME64_MAX in case of overflow. 220 */ 221 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 222 const struct timespec64 rhs); 223 224 #endif /* _LINUX_TIME64_H */ 225