3 * Copyright IBM Corp. 1999
5 * Derived from "include/asm-i386/timex.h"
6 * Copyright (C) 1992, Linus Torvalds
9 #ifndef _ASM_S390_TIMEX_H
10 #define _ASM_S390_TIMEX_H
12 #include <asm/lowcore.h>
14 /* The value of the TOD clock for 1.1.1970. */
15 #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
17 /* Inline functions for clock register access. */
18 static inline int set_clock(__u64 time)
26 : "=d" (cc) : "Q" (time) : "cc");
30 static inline int store_clock(__u64 *time)
38 : "=d" (cc), "=Q" (*time) : : "cc");
42 static inline void set_clock_comparator(__u64 time)
44 asm volatile("sckc %0" : : "Q" (time));
47 static inline void store_clock_comparator(__u64 *time)
49 asm volatile("stckc %0" : "=Q" (*time));
52 void clock_comparator_work(void);
54 static inline unsigned long long local_tick_disable(void)
56 unsigned long long old;
58 old = S390_lowcore.clock_comparator;
59 S390_lowcore.clock_comparator = -1ULL;
60 set_clock_comparator(S390_lowcore.clock_comparator);
64 static inline void local_tick_enable(unsigned long long comp)
66 S390_lowcore.clock_comparator = comp;
67 set_clock_comparator(S390_lowcore.clock_comparator);
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 #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
79 asm volatile(".insn s,0xb27c0000,%0" : "=Q" (clk) : : "cc");
81 asm volatile("stck %0" : "=Q" (clk) : : "cc");
86 static inline void get_clock_ext(char *clk)
88 asm volatile("stcke %0" : "=Q" (*clk) : : "cc");
91 static inline unsigned long long get_clock_xt(void)
93 unsigned char clk[16];
95 return *((unsigned long long *)&clk[1]);
98 static inline cycles_t get_cycles(void)
100 return (cycles_t) get_clock() >> 2;
103 int get_sync_clock(unsigned long long *clock);
104 void init_cpu_timer(void);
105 unsigned long long monotonic_clock(void);
107 void tod_to_timeval(__u64, struct timespec *);
110 void stck_to_timespec(unsigned long long stck, struct timespec *ts)
112 tod_to_timeval(stck - TOD_UNIX_EPOCH, ts);
115 extern u64 sched_clock_base_cc;
118 * get_clock_monotonic - returns current time in clock rate units
120 * The caller must ensure that preemption is disabled.
121 * The clock and sched_clock_base get changed via stop_machine.
122 * Therefore preemption must be disabled when calling this
123 * function, otherwise the returned value is not guaranteed to
126 static inline unsigned long long get_clock_monotonic(void)
128 return get_clock_xt() - sched_clock_base_cc;