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 #if __BITS_PER_LONG == 64 11 /* this trick allows us to optimize out timespec64_to_timespec */ 12 # define timespec64 timespec 13 #define itimerspec64 itimerspec 14 #else 15 struct timespec64 { 16 time64_t tv_sec; /* seconds */ 17 long tv_nsec; /* nanoseconds */ 18 }; 19 20 struct itimerspec64 { 21 struct timespec64 it_interval; 22 struct timespec64 it_value; 23 }; 24 25 #endif 26 27 /* Parameters used to convert the timespec values: */ 28 #define MSEC_PER_SEC 1000L 29 #define USEC_PER_MSEC 1000L 30 #define NSEC_PER_USEC 1000L 31 #define NSEC_PER_MSEC 1000000L 32 #define USEC_PER_SEC 1000000L 33 #define NSEC_PER_SEC 1000000000L 34 #define FSEC_PER_SEC 1000000000000000LL 35 36 /* Located here for timespec[64]_valid_strict */ 37 #define TIME64_MAX ((s64)~((u64)1 << 63)) 38 #define KTIME_MAX ((s64)~((u64)1 << 63)) 39 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) 40 41 static inline int timespec64_equal(const struct timespec64 *a, 42 const struct timespec64 *b) 43 { 44 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 45 } 46 47 /* 48 * lhs < rhs: return <0 49 * lhs == rhs: return 0 50 * lhs > rhs: return >0 51 */ 52 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) 53 { 54 if (lhs->tv_sec < rhs->tv_sec) 55 return -1; 56 if (lhs->tv_sec > rhs->tv_sec) 57 return 1; 58 return lhs->tv_nsec - rhs->tv_nsec; 59 } 60 61 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); 62 63 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 64 struct timespec64 rhs) 65 { 66 struct timespec64 ts_delta; 67 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 68 lhs.tv_nsec + rhs.tv_nsec); 69 return ts_delta; 70 } 71 72 /* 73 * sub = lhs - rhs, in normalized form 74 */ 75 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 76 struct timespec64 rhs) 77 { 78 struct timespec64 ts_delta; 79 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 80 lhs.tv_nsec - rhs.tv_nsec); 81 return ts_delta; 82 } 83 84 /* 85 * Returns true if the timespec64 is norm, false if denorm: 86 */ 87 static inline bool timespec64_valid(const struct timespec64 *ts) 88 { 89 /* Dates before 1970 are bogus */ 90 if (ts->tv_sec < 0) 91 return false; 92 /* Can't have more nanoseconds then a second */ 93 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 94 return false; 95 return true; 96 } 97 98 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 99 { 100 if (!timespec64_valid(ts)) 101 return false; 102 /* Disallow values that could overflow ktime_t */ 103 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 104 return false; 105 return true; 106 } 107 108 /** 109 * timespec64_to_ns - Convert timespec64 to nanoseconds 110 * @ts: pointer to the timespec64 variable to be converted 111 * 112 * Returns the scalar nanosecond representation of the timespec64 113 * parameter. 114 */ 115 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 116 { 117 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 118 } 119 120 /** 121 * ns_to_timespec64 - Convert nanoseconds to timespec64 122 * @nsec: the nanoseconds value to be converted 123 * 124 * Returns the timespec64 representation of the nsec parameter. 125 */ 126 extern struct timespec64 ns_to_timespec64(const s64 nsec); 127 128 /** 129 * timespec64_add_ns - Adds nanoseconds to a timespec64 130 * @a: pointer to timespec64 to be incremented 131 * @ns: unsigned nanoseconds value to be added 132 * 133 * This must always be inlined because its used from the x86-64 vdso, 134 * which cannot call other kernel functions. 135 */ 136 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 137 { 138 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 139 a->tv_nsec = ns; 140 } 141 142 /* 143 * timespec64_add_safe assumes both values are positive and checks for 144 * overflow. It will return TIME64_MAX in case of overflow. 145 */ 146 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 147 const struct timespec64 rhs); 148 149 #endif /* _LINUX_TIME64_H */ 150