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Linux/arch/s390/include/asm/cputime.h

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  1 /*
  2  *  Copyright IBM Corp. 2004
  3  *
  4  *  Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
  5  */
  6 
  7 #ifndef _S390_CPUTIME_H
  8 #define _S390_CPUTIME_H
  9 
 10 #include <linux/types.h>
 11 #include <asm/div64.h>
 12 
 13 #define CPUTIME_PER_USEC 4096ULL
 14 #define CPUTIME_PER_SEC (CPUTIME_PER_USEC * USEC_PER_SEC)
 15 
 16 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
 17 
 18 typedef unsigned long long __nocast cputime_t;
 19 typedef unsigned long long __nocast cputime64_t;
 20 
 21 #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)
 22 
 23 static inline unsigned long __div(unsigned long long n, unsigned long base)
 24 {
 25         return n / base;
 26 }
 27 
 28 #define cputime_one_jiffy               jiffies_to_cputime(1)
 29 
 30 /*
 31  * Convert cputime to jiffies and back.
 32  */
 33 static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
 34 {
 35         return __div((__force unsigned long long) cputime, CPUTIME_PER_SEC / HZ);
 36 }
 37 
 38 static inline cputime_t jiffies_to_cputime(const unsigned int jif)
 39 {
 40         return (__force cputime_t)(jif * (CPUTIME_PER_SEC / HZ));
 41 }
 42 
 43 static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
 44 {
 45         unsigned long long jif = (__force unsigned long long) cputime;
 46         do_div(jif, CPUTIME_PER_SEC / HZ);
 47         return jif;
 48 }
 49 
 50 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
 51 {
 52         return (__force cputime64_t)(jif * (CPUTIME_PER_SEC / HZ));
 53 }
 54 
 55 /*
 56  * Convert cputime to microseconds and back.
 57  */
 58 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
 59 {
 60         return (__force unsigned long long) cputime >> 12;
 61 }
 62 
 63 static inline cputime_t usecs_to_cputime(const unsigned int m)
 64 {
 65         return (__force cputime_t)(m * CPUTIME_PER_USEC);
 66 }
 67 
 68 #define usecs_to_cputime64(m)           usecs_to_cputime(m)
 69 
 70 /*
 71  * Convert cputime to milliseconds and back.
 72  */
 73 static inline unsigned int cputime_to_secs(const cputime_t cputime)
 74 {
 75         return __div((__force unsigned long long) cputime, CPUTIME_PER_SEC / 2) >> 1;
 76 }
 77 
 78 static inline cputime_t secs_to_cputime(const unsigned int s)
 79 {
 80         return (__force cputime_t)(s * CPUTIME_PER_SEC);
 81 }
 82 
 83 /*
 84  * Convert cputime to timespec and back.
 85  */
 86 static inline cputime_t timespec_to_cputime(const struct timespec *value)
 87 {
 88         unsigned long long ret = value->tv_sec * CPUTIME_PER_SEC;
 89         return (__force cputime_t)(ret + __div(value->tv_nsec * CPUTIME_PER_USEC, NSEC_PER_USEC));
 90 }
 91 
 92 static inline void cputime_to_timespec(const cputime_t cputime,
 93                                        struct timespec *value)
 94 {
 95         unsigned long long __cputime = (__force unsigned long long) cputime;
 96         value->tv_nsec = (__cputime % CPUTIME_PER_SEC) * NSEC_PER_USEC / CPUTIME_PER_USEC;
 97         value->tv_sec = __cputime / CPUTIME_PER_SEC;
 98 }
 99 
100 /*
101  * Convert cputime to timeval and back.
102  * Since cputime and timeval have the same resolution (microseconds)
103  * this is easy.
104  */
105 static inline cputime_t timeval_to_cputime(const struct timeval *value)
106 {
107         unsigned long long ret = value->tv_sec * CPUTIME_PER_SEC;
108         return (__force cputime_t)(ret + value->tv_usec * CPUTIME_PER_USEC);
109 }
110 
111 static inline void cputime_to_timeval(const cputime_t cputime,
112                                       struct timeval *value)
113 {
114         unsigned long long __cputime = (__force unsigned long long) cputime;
115         value->tv_usec = (__cputime % CPUTIME_PER_SEC) / CPUTIME_PER_USEC;
116         value->tv_sec = __cputime / CPUTIME_PER_SEC;
117 }
118 
119 /*
120  * Convert cputime to clock and back.
121  */
122 static inline clock_t cputime_to_clock_t(cputime_t cputime)
123 {
124         unsigned long long clock = (__force unsigned long long) cputime;
125         do_div(clock, CPUTIME_PER_SEC / USER_HZ);
126         return clock;
127 }
128 
129 static inline cputime_t clock_t_to_cputime(unsigned long x)
130 {
131         return (__force cputime_t)(x * (CPUTIME_PER_SEC / USER_HZ));
132 }
133 
134 /*
135  * Convert cputime64 to clock.
136  */
137 static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
138 {
139         unsigned long long clock = (__force unsigned long long) cputime;
140         do_div(clock, CPUTIME_PER_SEC / USER_HZ);
141         return clock;
142 }
143 
144 cputime64_t arch_cpu_idle_time(int cpu);
145 
146 #define arch_idle_time(cpu) arch_cpu_idle_time(cpu)
147 
148 #endif /* _S390_CPUTIME_H */
149 

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