1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TIME64_H 3 #define _LINUX_TIME64_H 4 5 #include <linux/math64.h> 6 7 typedef __s64 time64_t; 8 typedef __u64 timeu64_t; 9 10 /* CONFIG_64BIT_TIME enables new 64 bit time_t syscalls in the compat path 11 * and 32-bit emulation. 12 */ 13 #ifndef CONFIG_64BIT_TIME 14 #define __kernel_timespec timespec 15 #endif 16 17 #include <uapi/linux/time.h> 18 19 struct timespec64 { 20 time64_t tv_sec; /* seconds */ 21 long tv_nsec; /* nanoseconds */ 22 }; 23 24 struct itimerspec64 { 25 struct timespec64 it_interval; 26 struct timespec64 it_value; 27 }; 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 static inline int timespec64_equal(const struct timespec64 *a, 44 const struct timespec64 *b) 45 { 46 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 47 } 48 49 /* 50 * lhs < rhs: return <0 51 * lhs == rhs: return 0 52 * lhs > rhs: return >0 53 */ 54 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) 55 { 56 if (lhs->tv_sec < rhs->tv_sec) 57 return -1; 58 if (lhs->tv_sec > rhs->tv_sec) 59 return 1; 60 return lhs->tv_nsec - rhs->tv_nsec; 61 } 62 63 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); 64 65 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 66 struct timespec64 rhs) 67 { 68 struct timespec64 ts_delta; 69 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 70 lhs.tv_nsec + rhs.tv_nsec); 71 return ts_delta; 72 } 73 74 /* 75 * sub = lhs - rhs, in normalized form 76 */ 77 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 78 struct timespec64 rhs) 79 { 80 struct timespec64 ts_delta; 81 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 82 lhs.tv_nsec - rhs.tv_nsec); 83 return ts_delta; 84 } 85 86 /* 87 * Returns true if the timespec64 is norm, false if denorm: 88 */ 89 static inline bool timespec64_valid(const struct timespec64 *ts) 90 { 91 /* Dates before 1970 are bogus */ 92 if (ts->tv_sec < 0) 93 return false; 94 /* Can't have more nanoseconds then a second */ 95 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 96 return false; 97 return true; 98 } 99 100 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 101 { 102 if (!timespec64_valid(ts)) 103 return false; 104 /* Disallow values that could overflow ktime_t */ 105 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 106 return false; 107 return true; 108 } 109 110 /** 111 * timespec64_to_ns - Convert timespec64 to nanoseconds 112 * @ts: pointer to the timespec64 variable to be converted 113 * 114 * Returns the scalar nanosecond representation of the timespec64 115 * parameter. 116 */ 117 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 118 { 119 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 120 } 121 122 /** 123 * ns_to_timespec64 - Convert nanoseconds to timespec64 124 * @nsec: the nanoseconds value to be converted 125 * 126 * Returns the timespec64 representation of the nsec parameter. 127 */ 128 extern struct timespec64 ns_to_timespec64(const s64 nsec); 129 130 /** 131 * timespec64_add_ns - Adds nanoseconds to a timespec64 132 * @a: pointer to timespec64 to be incremented 133 * @ns: unsigned nanoseconds value to be added 134 * 135 * This must always be inlined because its used from the x86-64 vdso, 136 * which cannot call other kernel functions. 137 */ 138 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 139 { 140 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 141 a->tv_nsec = ns; 142 } 143 144 /* 145 * timespec64_add_safe assumes both values are positive and checks for 146 * overflow. It will return TIME64_MAX in case of overflow. 147 */ 148 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 149 const struct timespec64 rhs); 150 151 #endif /* _LINUX_TIME64_H */ 152