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. */ 18 static 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 30 static 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 42 static inline void set_clock_comparator(__u64 time) 43 { 44 asm volatile("sckc %0" : : "Q" (time)); 45 } 46 47 static 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 54 typedef unsigned long long cycles_t; 55 56 static 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 64 static inline unsigned long long get_clock_xt(void) 65 { 66 unsigned char clk[16]; 67 68 asm volatile("stcke %0" : "=Q" (clk) : : "cc"); 69 return *((unsigned long long *)&clk[1]); 70 } 71 72 static inline cycles_t get_cycles(void) 73 { 74 return (cycles_t) get_clock() >> 2; 75 } 76 77 int get_sync_clock(unsigned long long *clock); 78 void init_cpu_timer(void); 79 unsigned long long monotonic_clock(void); 80 81 void tod_to_timeval(__u64, struct timespec *); 82 83 static inline 84 void stck_to_timespec(unsigned long long stck, struct timespec *ts) 85 { 86 tod_to_timeval(stck - TOD_UNIX_EPOCH, ts); 87 } 88 89 extern u64 sched_clock_base_cc; 90 91 /** 92 * get_clock_monotonic - returns current time in clock rate units 93 * 94 * The caller must ensure that preemption is disabled. 95 * The clock and sched_clock_base get changed via stop_machine. 96 * Therefore preemption must be disabled when calling this 97 * function, otherwise the returned value is not guaranteed to 98 * be monotonic. 99 */ 100 static inline unsigned long long get_clock_monotonic(void) 101 { 102 return get_clock_xt() - sched_clock_base_cc; 103 } 104 105 #endif 106