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 0(%2)\n" 24 " ipm %0\n" 25 " srl %0,28\n" 26 : "=d" (cc) : "m" (time), "a" (&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 0(%2)\n" 36 " ipm %0\n" 37 " srl %0,28\n" 38 : "=d" (cc), "=m" (*time) : "a" (time) : "cc"); 39 return cc; 40 } 41 42 static inline void set_clock_comparator(__u64 time) 43 { 44 asm volatile("sckc 0(%1)" : : "m" (time), "a" (&time)); 45 } 46 47 static inline void store_clock_comparator(__u64 *time) 48 { 49 asm volatile("stckc 0(%1)" : "=m" (*time) : "a" (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 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) 61 asm volatile("stck %0" : "=Q" (clk) : : "cc"); 62 #else /* __GNUC__ */ 63 asm volatile("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc"); 64 #endif /* __GNUC__ */ 65 return clk; 66 } 67 68 static inline unsigned long long get_clock_xt(void) 69 { 70 unsigned char clk[16]; 71 72 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) 73 asm volatile("stcke %0" : "=Q" (clk) : : "cc"); 74 #else /* __GNUC__ */ 75 asm volatile("stcke 0(%1)" : "=m" (clk) 76 : "a" (clk) : "cc"); 77 #endif /* __GNUC__ */ 78 79 return *((unsigned long long *)&clk[1]); 80 } 81 82 static inline cycles_t get_cycles(void) 83 { 84 return (cycles_t) get_clock() >> 2; 85 } 86 87 int get_sync_clock(unsigned long long *clock); 88 void init_cpu_timer(void); 89 unsigned long long monotonic_clock(void); 90 91 void tod_to_timeval(__u64, struct timespec *); 92 93 static inline 94 void stck_to_timespec(unsigned long long stck, struct timespec *ts) 95 { 96 tod_to_timeval(stck - TOD_UNIX_EPOCH, ts); 97 } 98 99 extern u64 sched_clock_base_cc; 100 101 /** 102 * get_clock_monotonic - returns current time in clock rate units 103 * 104 * The caller must ensure that preemption is disabled. 105 * The clock and sched_clock_base get changed via stop_machine. 106 * Therefore preemption must be disabled when calling this 107 * function, otherwise the returned value is not guaranteed to 108 * be monotonic. 109 */ 110 static inline unsigned long long get_clock_monotonic(void) 111 { 112 return get_clock_xt() - sched_clock_base_cc; 113 } 114 115 #endif 116