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;
62 set_clock_comparator(S390_lowcore.clock_comparator);
66 static inline void local_tick_enable(unsigned long long comp)
68 S390_lowcore.clock_comparator = comp;
69 set_clock_comparator(S390_lowcore.clock_comparator);
72 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
74 typedef unsigned long long cycles_t;
76 static inline unsigned long long get_clock(void)
78 unsigned long long clk;
80 #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
81 asm volatile(".insn s,0xb27c0000,%0" : "=Q" (clk) : : "cc");
83 asm volatile("stck %0" : "=Q" (clk) : : "cc");
88 static inline void get_clock_ext(char *clk)
90 asm volatile("stcke %0" : "=Q" (*clk) : : "cc");
93 static inline unsigned long long get_clock_xt(void)
95 unsigned char clk[16];
97 return *((unsigned long long *)&clk[1]);
100 static inline cycles_t get_cycles(void)
102 return (cycles_t) get_clock() >> 2;
105 int get_sync_clock(unsigned long long *clock);
106 void init_cpu_timer(void);
107 unsigned long long monotonic_clock(void);
109 void tod_to_timeval(__u64, struct timespec *);
112 void stck_to_timespec(unsigned long long stck, struct timespec *ts)
114 tod_to_timeval(stck - TOD_UNIX_EPOCH, ts);
117 extern u64 sched_clock_base_cc;
120 * get_clock_monotonic - returns current time in clock rate units
122 * The caller must ensure that preemption is disabled.
123 * The clock and sched_clock_base get changed via stop_machine.
124 * Therefore preemption must be disabled when calling this
125 * function, otherwise the returned value is not guaranteed to
128 static inline unsigned long long get_clock_monotonic(void)
130 return get_clock_xt() - sched_clock_base_cc;