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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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. */
18static 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
30static 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
42static inline void set_clock_comparator(__u64 time)
43{
44 asm volatile("sckc 0(%1)" : : "m" (time), "a" (&time));
45}
46
47static 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
54typedef unsigned long long cycles_t;
55
56static 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
68static 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
82static inline cycles_t get_cycles(void)
83{
84 return (cycles_t) get_clock() >> 2;
85}
86
87int get_sync_clock(unsigned long long *clock);
88void init_cpu_timer(void);
89unsigned long long monotonic_clock(void);
90
91void tod_to_timeval(__u64, struct timespec *);
92
93static inline
94void stck_to_timespec(unsigned long long stck, struct timespec *ts)
95{
96 tod_to_timeval(stck - TOD_UNIX_EPOCH, ts);
97}
98
99extern 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 */
110static inline unsigned long long get_clock_monotonic(void)
111{
112 return get_clock_xt() - sched_clock_base_cc;
113}
114
115#endif