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 cputime_to_scaled(__ct)         (__ct)
  58 #define jiffies_to_cputime(__hz)        ((cputime_t)(__hz) * (1000000 / HZ))
  59
  60 #define cputime64_zero                  (0ULL)
  61 #define cputime64_add(__a, __b)         ((__a) + (__b))
  62 #define cputime_to_cputime64(__ct)      (__ct)
  63
  64 static inline u64
  65 cputime64_to_jiffies64(cputime64_t cputime)
  66 {
  67         do_div(cputime, 1000000 / HZ);
  68         return cputime;
  69 }
  70
  71 /*
  72  * Convert cputime to milliseconds and back.
  73  */
  74 static inline unsigned int
  75 cputime_to_msecs(const cputime_t cputime)
  76 {
  77         return __div(cputime, 1000);
  78 }
  79
  80 static inline cputime_t
  81 msecs_to_cputime(const unsigned int m)
  82 {
  83         return (cputime_t) m * 1000;
  84 }
  85
  86 /*
  87  * Convert cputime to milliseconds and back.
  88  */
  89 static inline unsigned int
  90 cputime_to_secs(const cputime_t cputime)
  91 {
  92         return __div(cputime, 1000000);
  93 }
  94
  95 static inline cputime_t
  96 secs_to_cputime(const unsigned int s)
  97 {
  98         return (cputime_t) s * 1000000;
  99 }
 100
 101 /*
 102  * Convert cputime to timespec and back.
 103  */
 104 static inline cputime_t
 105 timespec_to_cputime(const struct timespec *value)
 106 {
 107         return value->tv_nsec / 1000 + (u64) value->tv_sec * 1000000;
 108 }
 109
 110 static inline void
 111 cputime_to_timespec(const cputime_t cputime, struct timespec *value)
 112 {
 113 #ifndef __s390x__
 114         register_pair rp;
 115
 116         rp.pair = cputime >> 1;
 117         asm ("dr %0,%1" : "+d" (rp) : "d" (1000000 >> 1));
 118         value->tv_nsec = rp.subreg.even * 1000;
 119         value->tv_sec = rp.subreg.odd;
 120 #else
 121         value->tv_nsec = (cputime % 1000000) * 1000;
 122         value->tv_sec = cputime / 1000000;
 123 #endif
 124 }
 125
 126 /*
 127  * Convert cputime to timeval and back.
 128  * Since cputime and timeval have the same resolution (microseconds)
 129  * this is easy.
 130  */
 131 static inline cputime_t
 132 timeval_to_cputime(const struct timeval *value)
 133 {
 134         return value->tv_usec + (u64) value->tv_sec * 1000000;
 135 }
 136
 137 static inline void
 138 cputime_to_timeval(const cputime_t cputime, struct timeval *value)
 139 {
 140 #ifndef __s390x__
 141         register_pair rp;
 142
 143         rp.pair = cputime >> 1;
 144         asm ("dr %0,%1" : "+d" (rp) : "d" (1000000 >> 1));
 145         value->tv_usec = rp.subreg.even;
 146         value->tv_sec = rp.subreg.odd;
 147 #else
 148         value->tv_usec = cputime % 1000000;
 149         value->tv_sec = cputime / 1000000;
 150 #endif
 151 }
 152
 153 /*
 154  * Convert cputime to clock and back.
 155  */
 156 static inline clock_t
 157 cputime_to_clock_t(cputime_t cputime)
 158 {
 159         return __div(cputime, 1000000 / USER_HZ);
 160 }
 161
 162 static inline cputime_t
 163 clock_t_to_cputime(unsigned long x)
 164 {
 165         return (cputime_t) x * (1000000 / USER_HZ);
 166 }
 167
 168 /*
 169  * Convert cputime64 to clock.
 170  */
 171 static inline clock_t
 172 cputime64_to_clock_t(cputime64_t cputime)
 173 {
 174        return __div(cputime, 1000000 / USER_HZ);
 175 }
 176
 177 #endif /* _S390_CPUTIME_H */