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_safe timespec_add_safe 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 /* 138 * timespec64_add_safe assumes both values are positive and checks for 139 * overflow. It will return TIME_T_MAX if the returned value would be 140 * smaller then either of the arguments. 141 */ 142 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 143 const struct timespec64 rhs); 144 145 146 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 147 struct timespec64 rhs) 148 { 149 struct timespec64 ts_delta; 150 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 151 lhs.tv_nsec + rhs.tv_nsec); 152 return ts_delta; 153 } 154 155 /* 156 * sub = lhs - rhs, in normalized form 157 */ 158 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 159 struct timespec64 rhs) 160 { 161 struct timespec64 ts_delta; 162 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 163 lhs.tv_nsec - rhs.tv_nsec); 164 return ts_delta; 165 } 166 167 /* 168 * Returns true if the timespec64 is norm, false if denorm: 169 */ 170 static inline bool timespec64_valid(const struct timespec64 *ts) 171 { 172 /* Dates before 1970 are bogus */ 173 if (ts->tv_sec < 0) 174 return false; 175 /* Can't have more nanoseconds then a second */ 176 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 177 return false; 178 return true; 179 } 180 181 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 182 { 183 if (!timespec64_valid(ts)) 184 return false; 185 /* Disallow values that could overflow ktime_t */ 186 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 187 return false; 188 return true; 189 } 190 191 /** 192 * timespec64_to_ns - Convert timespec64 to nanoseconds 193 * @ts: pointer to the timespec64 variable to be converted 194 * 195 * Returns the scalar nanosecond representation of the timespec64 196 * parameter. 197 */ 198 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 199 { 200 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 201 } 202 203 /** 204 * ns_to_timespec64 - Convert nanoseconds to timespec64 205 * @nsec: the nanoseconds value to be converted 206 * 207 * Returns the timespec64 representation of the nsec parameter. 208 */ 209 extern struct timespec64 ns_to_timespec64(const s64 nsec); 210 211 /** 212 * timespec64_add_ns - Adds nanoseconds to a timespec64 213 * @a: pointer to timespec64 to be incremented 214 * @ns: unsigned nanoseconds value to be added 215 * 216 * This must always be inlined because its used from the x86-64 vdso, 217 * which cannot call other kernel functions. 218 */ 219 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 220 { 221 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 222 a->tv_nsec = ns; 223 } 224 225 #endif 226 227 #endif /* _LINUX_TIME64_H */ 228