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#include <asm/lowcore.h> 15 16/* The value of the TOD clock for 1.1.1970. */ 17#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL 18 19/* Inline functions for clock register access. */ 20static inline int set_clock(__u64 time) 21{ 22 int cc; 23 24 asm volatile( 25 " sck %1\n" 26 " ipm %0\n" 27 " srl %0,28\n" 28 : "=d" (cc) : "Q" (time) : "cc"); 29 return cc; 30} 31 32static inline int store_clock(__u64 *time) 33{ 34 int cc; 35 36 asm volatile( 37 " stck %1\n" 38 " ipm %0\n" 39 " srl %0,28\n" 40 : "=d" (cc), "=Q" (*time) : : "cc"); 41 return cc; 42} 43 44static inline void set_clock_comparator(__u64 time) 45{ 46 asm volatile("sckc %0" : : "Q" (time)); 47} 48 49static inline void store_clock_comparator(__u64 *time) 50{ 51 asm volatile("stckc %0" : "=Q" (*time)); 52} 53 54void clock_comparator_work(void); 55 56static inline unsigned long long local_tick_disable(void) 57{ 58 unsigned long long old; 59 60 old = S390_lowcore.clock_comparator; 61 S390_lowcore.clock_comparator = -1ULL; 62 set_clock_comparator(S390_lowcore.clock_comparator); 63 return old; 64} 65 66static inline void local_tick_enable(unsigned long long comp) 67{ 68 S390_lowcore.clock_comparator = comp; 69 set_clock_comparator(S390_lowcore.clock_comparator); 70} 71 72#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ 73 74typedef unsigned long long cycles_t; 75 76static inline unsigned long long get_clock (void) 77{ 78 unsigned long long clk; 79 80 asm volatile("stck %0" : "=Q" (clk) : : "cc"); 81 return clk; 82} 83 84static inline void get_clock_ext(char *clk) 85{ 86 asm volatile("stcke %0" : "=Q" (*clk) : : "cc"); 87} 88 89static inline unsigned long long get_clock_fast(void) 90{ 91 unsigned long long clk; 92 93 if (MACHINE_HAS_STCKF) 94 asm volatile(".insn s,0xb27c0000,%0" : "=Q" (clk) : : "cc"); 95 else 96 clk = get_clock(); 97 return clk; 98} 99 100static inline unsigned long long get_clock_xt(void) 101{ 102 unsigned char clk[16]; 103 get_clock_ext(clk); 104 return *((unsigned long long *)&clk[1]); 105} 106 107static inline cycles_t get_cycles(void) 108{ 109 return (cycles_t) get_clock() >> 2; 110} 111 112int get_sync_clock(unsigned long long *clock); 113void init_cpu_timer(void); 114unsigned long long monotonic_clock(void); 115 116void tod_to_timeval(__u64, struct timespec *); 117 118static inline 119void stck_to_timespec(unsigned long long stck, struct timespec *ts) 120{ 121 tod_to_timeval(stck - TOD_UNIX_EPOCH, ts); 122} 123 124extern u64 sched_clock_base_cc; 125 126/** 127 * get_clock_monotonic - returns current time in clock rate units 128 * 129 * The caller must ensure that preemption is disabled. 130 * The clock and sched_clock_base get changed via stop_machine. 131 * Therefore preemption must be disabled when calling this 132 * function, otherwise the returned value is not guaranteed to 133 * be monotonic. 134 */ 135static inline unsigned long long get_clock_monotonic(void) 136{ 137 return get_clock_xt() - sched_clock_base_cc; 138} 139 140#endif 141