include/asm-s390/cputime.h

   1 /*
   2  *  include/asm-s390/cputime.h
   3  *
   4  *  (C) Copyright IBM Corp. 2004
   5  *
   6  *  Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  */
   8
   9 #ifndef _S390_CPUTIME_H
  10 #define _S390_CPUTIME_H
  11
  12 #include <asm/div64.h>
  13
  14 /* We want to use micro-second resolution. */
  15
  16 typedef unsigned long long cputime_t;
  17 typedef unsigned long long cputime64_t;
  18
  19 #ifndef __s390x__
  20
  21 static inline unsigned int
  22 __div(unsigned long long n, unsigned int base)
  23 {
  24         register_pair rp;
  25
  26         rp.pair = n >> 1;
  27         asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
  28         return rp.subreg.odd;
  29 }
  30
  31 #else /* __s390x__ */
  32
  33 static inline unsigned int
  34 __div(unsigned long long n, unsigned int base)
  35 {
  36         return n / base;
  37 }
  38
  39 #endif /* __s390x__ */
  40
  41 #define cputime_zero                    (0ULL)
  42 #define cputime_max                     ((~0UL >> 1) - 1)
  43 #define cputime_add(__a, __b)           ((__a) +  (__b))
  44 #define cputime_sub(__a, __b)           ((__a) -  (__b))
  45 #define cputime_div(__a, __n) ({                \
  46         unsigned long long __div = (__a);       \
  47         do_div(__div,__n);                      \
  48         __div;                                  \
  49 })
  50 #define cputime_halve(__a)              ((__a) >> 1)
  51 #define cputime_eq(__a, __b)            ((__a) == (__b))
  52 #define cputime_gt(__a, __b)            ((__a) >  (__b))
  53 #define cputime_ge(__a, __b)            ((__a) >= (__b))
  54 #define cputime_lt(__a, __b)            ((__a) <  (__b))
  55 #define cputime_le(__a, __b)            ((__a) <= (__b))
  56 #define cputime_to_jiffies(__ct)        (__div((__ct), 1000000 / HZ))
  57 #define jiffies_to_cputime(__hz)        ((cputime_t)(__hz) * (1000000 / HZ))
  58
  59 #define cputime64_zero                  (0ULL)
  60 #define cputime64_add(__a, __b)         ((__a) + (__b))
  61 #define cputime_to_cputime64(__ct)      (__ct)
  62
  63 static inline u64
  64 cputime64_to_jiffies64(cputime64_t cputime)
  65 {
  66         do_div(cputime, 1000000 / HZ);
  67         return cputime;
  68 }
  69
  70 /*
  71  * Convert cputime to milliseconds and back.
  72  */
  73 static inline unsigned int
  74 cputime_to_msecs(const cputime_t cputime)
  75 {
  76         return __div(cputime, 1000);
  77 }
  78
  79 static inline cputime_t
  80 msecs_to_cputime(const unsigned int m)
  81 {
  82         return (cputime_t) m * 1000;
  83 }
  84
  85 /*
  86  * Convert cputime to milliseconds and back.
  87  */
  88 static inline unsigned int
  89 cputime_to_secs(const cputime_t cputime)
  90 {
  91         return __div(cputime, 1000000);
  92 }
  93
  94 static inline cputime_t
  95 secs_to_cputime(const unsigned int s)
  96 {
  97         return (cputime_t) s * 1000000;
  98 }
  99
 100 /*
 101  * Convert cputime to timespec and back.
 102  */
 103 static inline cputime_t
 104 timespec_to_cputime(const struct timespec *value)
 105 {
 106         return value->tv_nsec / 1000 + (u64) value->tv_sec * 1000000;
 107 }
 108
 109 static inline void
 110 cputime_to_timespec(const cputime_t cputime, struct timespec *value)
 111 {
 112 #ifndef __s390x__
 113         register_pair rp;
 114
 115         rp.pair = cputime >> 1;
 116         asm ("dr %0,%1" : "+d" (rp) : "d" (1000000 >> 1));
 117         value->tv_nsec = rp.subreg.even * 1000;
 118         value->tv_sec = rp.subreg.odd;
 119 #else
 120         value->tv_nsec = (cputime % 1000000) * 1000;
 121         value->tv_sec = cputime / 1000000;
 122 #endif
 123 }
 124
 125 /*
 126  * Convert cputime to timeval and back.
 127  * Since cputime and timeval have the same resolution (microseconds)
 128  * this is easy.
 129  */
 130 static inline cputime_t
 131 timeval_to_cputime(const struct timeval *value)
 132 {
 133         return value->tv_usec + (u64) value->tv_sec * 1000000;
 134 }
 135
 136 static inline void
 137 cputime_to_timeval(const cputime_t cputime, struct timeval *value)
 138 {
 139 #ifndef __s390x__
 140         register_pair rp;
 141
 142         rp.pair = cputime >> 1;
 143         asm ("dr %0,%1" : "+d" (rp) : "d" (1000000 >> 1));
 144         value->tv_usec = rp.subreg.even;
 145         value->tv_sec = rp.subreg.odd;
 146 #else
 147         value->tv_usec = cputime % 1000000;
 148         value->tv_sec = cputime / 1000000;
 149 #endif
 150 }
 151
 152 /*
 153  * Convert cputime to clock and back.
 154  */
 155 static inline clock_t
 156 cputime_to_clock_t(cputime_t cputime)
 157 {
 158         return __div(cputime, 1000000 / USER_HZ);
 159 }
 160
 161 static inline cputime_t
 162 clock_t_to_cputime(unsigned long x)
 163 {
 164         return (cputime_t) x * (1000000 / USER_HZ);
 165 }
 166
 167 /*
 168  * Convert cputime64 to clock.
 169  */
 170 static inline clock_t
 171 cputime64_to_clock_t(cputime64_t cputime)
 172 {
 173        return __div(cputime, 1000000 / USER_HZ);
 174 }
 175
 176 #endif /* _S390_CPUTIME_H */