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 #define __kernel_itimerspec itimerspec 16 #endif 17 18 #include <uapi/linux/time.h> 19 20 struct timespec64 { 21 time64_t tv_sec; /* seconds */ 22 long tv_nsec; /* nanoseconds */ 23 }; 24 25 struct itimerspec64 { 26 struct timespec64 it_interval; 27 struct timespec64 it_value; 28 }; 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 static inline int timespec64_equal(const struct timespec64 *a, 45 const struct timespec64 *b) 46 { 47 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 48 } 49 50 /* 51 * lhs < rhs: return <0 52 * lhs == rhs: return 0 53 * lhs > rhs: return >0 54 */ 55 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) 56 { 57 if (lhs->tv_sec < rhs->tv_sec) 58 return -1; 59 if (lhs->tv_sec > rhs->tv_sec) 60 return 1; 61 return lhs->tv_nsec - rhs->tv_nsec; 62 } 63 64 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); 65 66 static inline struct timespec64 timespec64_add(struct timespec64 lhs, 67 struct timespec64 rhs) 68 { 69 struct timespec64 ts_delta; 70 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, 71 lhs.tv_nsec + rhs.tv_nsec); 72 return ts_delta; 73 } 74 75 /* 76 * sub = lhs - rhs, in normalized form 77 */ 78 static inline struct timespec64 timespec64_sub(struct timespec64 lhs, 79 struct timespec64 rhs) 80 { 81 struct timespec64 ts_delta; 82 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, 83 lhs.tv_nsec - rhs.tv_nsec); 84 return ts_delta; 85 } 86 87 /* 88 * Returns true if the timespec64 is norm, false if denorm: 89 */ 90 static inline bool timespec64_valid(const struct timespec64 *ts) 91 { 92 /* Dates before 1970 are bogus */ 93 if (ts->tv_sec < 0) 94 return false; 95 /* Can't have more nanoseconds then a second */ 96 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 97 return false; 98 return true; 99 } 100 101 static inline bool timespec64_valid_strict(const struct timespec64 *ts) 102 { 103 if (!timespec64_valid(ts)) 104 return false; 105 /* Disallow values that could overflow ktime_t */ 106 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 107 return false; 108 return true; 109 } 110 111 /** 112 * timespec64_to_ns - Convert timespec64 to nanoseconds 113 * @ts: pointer to the timespec64 variable to be converted 114 * 115 * Returns the scalar nanosecond representation of the timespec64 116 * parameter. 117 */ 118 static inline s64 timespec64_to_ns(const struct timespec64 *ts) 119 { 120 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 121 } 122 123 /** 124 * ns_to_timespec64 - Convert nanoseconds to timespec64 125 * @nsec: the nanoseconds value to be converted 126 * 127 * Returns the timespec64 representation of the nsec parameter. 128 */ 129 extern struct timespec64 ns_to_timespec64(const s64 nsec); 130 131 /** 132 * timespec64_add_ns - Adds nanoseconds to a timespec64 133 * @a: pointer to timespec64 to be incremented 134 * @ns: unsigned nanoseconds value to be added 135 * 136 * This must always be inlined because its used from the x86-64 vdso, 137 * which cannot call other kernel functions. 138 */ 139 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) 140 { 141 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 142 a->tv_nsec = ns; 143 } 144 145 /* 146 * timespec64_add_safe assumes both values are positive and checks for 147 * overflow. It will return TIME64_MAX in case of overflow. 148 */ 149 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, 150 const struct timespec64 rhs); 151 152 #endif /* _LINUX_TIME64_H */ 153