arch/s390/include/asm/cputime.h

   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 /*
  29  * Convert cputime to microseconds and back.
  30  */
  31 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
  32 {
  33         return (__force unsigned long long) cputime >> 12;
  34 }
  35
  36
  37 u64 arch_cpu_idle_time(int cpu);
  38
  39 #define arch_idle_time(cpu) arch_cpu_idle_time(cpu)
  40
  41 #endif /* _S390_CPUTIME_H */