1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright IBM Corp. 2004 4 * 5 * Author: Martin Schwidefsky <schwidefsky@de.ibm.com> 6 */ 7 8 #ifndef _S390_CPUTIME_H 9 #define _S390_CPUTIME_H 10 11 #include <linux/types.h> 12 #include <asm/timex.h> 13 14 #define CPUTIME_PER_USEC 4096ULL 15 #define CPUTIME_PER_SEC (CPUTIME_PER_USEC * USEC_PER_SEC) 16 17 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */ 18 19 #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new) 20 21 /* 22 * Convert cputime to microseconds. 23 */ 24 static inline u64 cputime_to_usecs(const u64 cputime) 25 { 26 return cputime >> 12; 27 } 28 29 /* 30 * Convert cputime to nanoseconds. 31 */ 32 #define cputime_to_nsecs(cputime) tod_to_ns(cputime) 33 34 u64 arch_cpu_idle_time(int cpu); 35 36 #define arch_idle_time(cpu) arch_cpu_idle_time(cpu) 37 38 #endif /* _S390_CPUTIME_H */ 39