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 typedef __u64 timeu64_t; 9 10 /* 11 * This wants to go into uapi/linux/time.h once we agreed about the 12 * userspace interfaces. 13 */ 14 #if __BITS_PER_LONG == 64 15 # define timespec64 timespec 16 #define itimerspec64 itimerspec 17 #else 18 struct timespec64 { 19 time64_t tv_sec; /* seconds */ 20 long tv_nsec; /* nanoseconds */ 21 }; 22 23 struct itimerspec64 { 24 struct timespec64 it_interval; 25 struct timespec64 it_value; 26 }; 27 28 #endif 29 30 /* Parameters used to convert the timespec values: */ 31 #define MSEC_PER_SEC 1000L 32 #define USEC_PER_MSEC 1000L 33 #define NSEC_PER_USEC 1000L 34 #define NSEC_PER_MSEC 1000000L 35 #define USEC_PER_SEC 1000000L 36 #define NSEC_PER_SEC 1000000000L 37 #define FSEC_PER_SEC 1000000000000000LL 38 39 /* Located here for timespec[64]_valid_strict */ 40 #define TIME64_MAX ((s64)~((u64)1 << 63)) 41 #define KTIME_MAX ((s64)~((u64)1 << 63)) 42 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) 43 44 #if __BITS_PER_LONG == 64 45 46 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) 47 { 48 return ts64; 49 } 50 51 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) 52 { 53 return ts; 54 } 55 56 static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) 57 { 58 return *its64; 59 } 60 61 static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) 62 { 63 return *its; 64 } 65 66 # define timespec64_equal timespec_equal 67 # define timespec64_compare timespec_compare 68 # define set_normalized_timespec64 set_normalized_timespec 69 # define timespec64_add timespec_add 70 # define timespec64_sub timespec_sub 71 # define timespec64_valid timespec_valid 72 # define timespec64_valid_strict timespec_valid_strict 73 # define timespec64_to_ns timespec_to_ns 74 # define ns_to_timespec64 ns_to_timespec 75 # define timespec64_add_ns timespec_add_ns 76 77 #else 78 79 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) 80 { 81 struct timespec ret; 82 83 ret.tv_sec = (time_t)ts64.tv_sec; 84 ret.tv_nsec = ts64.tv_nsec; 85 return ret; 86 } 87 88 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) 89 { 90 struct timespec64 ret; 91 92 ret.tv_sec = ts.tv_sec; 93 ret.tv_nsec = ts.tv_nsec; 94 return ret; 95 } 96 97 static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) 98 { 99 struct itimerspec ret; 100 101 ret.it_interval = timespec64_to_timespec(its64->it_interval); 102 ret.it_value = timespec64_to_timespec(its64->it_value); 103 return ret; 104 } 105 106 static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) 107 { 108 struct itimerspec64 ret; 109 110 ret.it_interval = timespec_to_timespec64(its->it_interval); 111 ret.it_value = timespec_to_timespec64(its->it_value); 112 return ret; 113 } 114 115 static inline int timespec64_equal(const struct timespec64 *a, 116 const struct timespec64 *b) 117 { 118 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 119 } 120 121 /* 122 * lhs < rhs: return <0 123 * lhs == rhs: return 0 124 * lhs > rhs: return >0 125 */ 126 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) 127 { 128 if (lhs->tv_sec < rhs->tv_sec) 129 return -1; 130 if (lhs->tv_sec > rhs->tv_sec) 131 return 1; 132 return lhs->tv_nsec - rhs->tv_nsec; 133 } 134 135 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); 136 137 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 138 struct timespec64 rhs) 139 { 140 struct timespec64 ts_delta; 141 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 142 lhs.tv_nsec + rhs.tv_nsec); 143 return ts_delta; 144 } 145 146 /* 147 * sub = lhs - rhs, in normalized form 148 */ 149 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 150 struct timespec64 rhs) 151 { 152 struct timespec64 ts_delta; 153 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 154 lhs.tv_nsec - rhs.tv_nsec); 155 return ts_delta; 156 } 157 158 /* 159 * Returns true if the timespec64 is norm, false if denorm: 160 */ 161 static inline bool timespec64_valid(const struct timespec64 *ts) 162 { 163 /* Dates before 1970 are bogus */ 164 if (ts->tv_sec < 0) 165 return false; 166 /* Can't have more nanoseconds then a second */ 167 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 168 return false; 169 return true; 170 } 171 172 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 173 { 174 if (!timespec64_valid(ts)) 175 return false; 176 /* Disallow values that could overflow ktime_t */ 177 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 178 return false; 179 return true; 180 } 181 182 /** 183 * timespec64_to_ns - Convert timespec64 to nanoseconds 184 * @ts: pointer to the timespec64 variable to be converted 185 * 186 * Returns the scalar nanosecond representation of the timespec64 187 * parameter. 188 */ 189 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 190 { 191 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 192 } 193 194 /** 195 * ns_to_timespec64 - Convert nanoseconds to timespec64 196 * @nsec: the nanoseconds value to be converted 197 * 198 * Returns the timespec64 representation of the nsec parameter. 199 */ 200 extern struct timespec64 ns_to_timespec64(const s64 nsec); 201 202 /** 203 * timespec64_add_ns - Adds nanoseconds to a timespec64 204 * @a: pointer to timespec64 to be incremented 205 * @ns: unsigned nanoseconds value to be added 206 * 207 * This must always be inlined because its used from the x86-64 vdso, 208 * which cannot call other kernel functions. 209 */ 210 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 211 { 212 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 213 a->tv_nsec = ns; 214 } 215 216 #endif 217 218 /* 219 * timespec64_add_safe assumes both values are positive and checks for 220 * overflow. It will return TIME64_MAX in case of overflow. 221 */ 222 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 223 const struct timespec64 rhs); 224 225 #endif /* _LINUX_TIME64_H */ 226