1/* 2 * include/asm-s390/timex.h 3 * 4 * S390 version 5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * 7 * Derived from "include/asm-i386/timex.h" 8 * Copyright (C) 1992, Linus Torvalds 9 */ 10 11#ifndef _ASM_S390_TIMEX_H 12#define _ASM_S390_TIMEX_H 13 14/* The value of the TOD clock for 1.1.1970. */ 15#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL 16 17/* Inline functions for clock register access. */ 18static inline int set_clock(__u64 time) 19{ 20 int cc; 21 22 asm volatile( 23 " sck %1\n" 24 " ipm %0\n" 25 " srl %0,28\n" 26 : "=d" (cc) : "Q" (time) : "cc"); 27 return cc; 28} 29 30static inline int store_clock(__u64 *time) 31{ 32 int cc; 33 34 asm volatile( 35 " stck %1\n" 36 " ipm %0\n" 37 " srl %0,28\n" 38 : "=d" (cc), "=Q" (*time) : : "cc"); 39 return cc; 40} 41 42static inline void set_clock_comparator(__u64 time) 43{ 44 asm volatile("sckc %0" : : "Q" (time)); 45} 46 47static inline void store_clock_comparator(__u64 *time) 48{ 49 asm volatile("stckc %0" : "=Q" (*time)); 50} 51 52#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ 53 54typedef unsigned long long cycles_t; 55 56static inline unsigned long long get_clock (void) 57{ 58 unsigned long long clk; 59 60 asm volatile("stck %0" : "=Q" (clk) : : "cc"); 61 return clk; 62} 63 64static inline void get_clock_ext(char *clk) 65{ 66 asm volatile("stcke %0" : "=Q" (*clk) : : "cc"); 67} 68 69static inline unsigned long long get_clock_xt(void) 70{ 71 unsigned char clk[16]; 72 get_clock_ext(clk); 73 return *((unsigned long long *)&clk[1]); 74} 75 76static inline cycles_t get_cycles(void) 77{ 78 return (cycles_t) get_clock() >> 2; 79} 80 81int get_sync_clock(unsigned long long *clock); 82void init_cpu_timer(void); 83unsigned long long monotonic_clock(void); 84 85void tod_to_timeval(__u64, struct timespec *); 86 87static inline 88void stck_to_timespec(unsigned long long stck, struct timespec *ts) 89{ 90 tod_to_timeval(stck - TOD_UNIX_EPOCH, ts); 91} 92 93extern u64 sched_clock_base_cc; 94 95/** 96 * get_clock_monotonic - returns current time in clock rate units 97 * 98 * The caller must ensure that preemption is disabled. 99 * The clock and sched_clock_base get changed via stop_machine. 100 * Therefore preemption must be disabled when calling this 101 * function, otherwise the returned value is not guaranteed to 102 * be monotonic. 103 */ 104static inline unsigned long long get_clock_monotonic(void) 105{ 106 return get_clock_xt() - sched_clock_base_cc; 107} 108 109#endif 110