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