2 * include/asm-s390/timex.h
5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Derived from "include/asm-i386/timex.h"
8 * Copyright (C) 1992, Linus Torvalds
11 #ifndef _ASM_S390_TIMEX_H
12 #define _ASM_S390_TIMEX_H
14 #include <asm/lowcore.h>
16 /* The value of the TOD clock for 1.1.1970. */
17 #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
19 /* Inline functions for clock register access. */
20 static inline int set_clock(__u64 time)
28 : "=d" (cc) : "Q" (time) : "cc");
32 static inline int store_clock(__u64 *time)
40 : "=d" (cc), "=Q" (*time) : : "cc");
44 static inline void set_clock_comparator(__u64 time)
46 asm volatile("sckc %0" : : "Q" (time));
49 static inline void store_clock_comparator(__u64 *time)
51 asm volatile("stckc %0" : "=Q" (*time));
54 void clock_comparator_work(void);
56 static inline unsigned long long local_tick_disable(void)
58 unsigned long long old;
60 old = S390_lowcore.clock_comparator;
61 S390_lowcore.clock_comparator = -1ULL;
65 static inline void local_tick_enable(unsigned long long comp)
67 S390_lowcore.clock_comparator = comp;
70 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
72 typedef unsigned long long cycles_t;
74 static inline unsigned long long get_clock (void)
76 unsigned long long clk;
78 asm volatile("stck %0" : "=Q" (clk) : : "cc");
82 static inline void get_clock_ext(char *clk)
84 asm volatile("stcke %0" : "=Q" (*clk) : : "cc");
87 static inline unsigned long long get_clock_xt(void)
89 unsigned char clk[16];
91 return *((unsigned long long *)&clk[1]);
94 static inline cycles_t get_cycles(void)
96 return (cycles_t) get_clock() >> 2;
99 int get_sync_clock(unsigned long long *clock);
100 void init_cpu_timer(void);
101 unsigned long long monotonic_clock(void);
103 void tod_to_timeval(__u64, struct timespec *);
106 void stck_to_timespec(unsigned long long stck, struct timespec *ts)
108 tod_to_timeval(stck - TOD_UNIX_EPOCH, ts);
111 extern u64 sched_clock_base_cc;
114 * get_clock_monotonic - returns current time in clock rate units
116 * The caller must ensure that preemption is disabled.
117 * The clock and sched_clock_base get changed via stop_machine.
118 * Therefore preemption must be disabled when calling this
119 * function, otherwise the returned value is not guaranteed to
122 static inline unsigned long long get_clock_monotonic(void)
124 return get_clock_xt() - sched_clock_base_cc;