Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
17eb7a5c HC |
14 | #include <asm/lowcore.h> |
15 | ||
b6112ccb MS |
16 | /* The value of the TOD clock for 1.1.1970. */ |
17 | #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL | |
18 | ||
d54853ef MS |
19 | /* Inline functions for clock register access. */ |
20 | static inline int set_clock(__u64 time) | |
21 | { | |
22 | int cc; | |
23 | ||
24 | asm volatile( | |
987bcdac | 25 | " sck %1\n" |
d54853ef MS |
26 | " ipm %0\n" |
27 | " srl %0,28\n" | |
987bcdac | 28 | : "=d" (cc) : "Q" (time) : "cc"); |
d54853ef MS |
29 | return cc; |
30 | } | |
31 | ||
32 | static inline int store_clock(__u64 *time) | |
33 | { | |
34 | int cc; | |
35 | ||
36 | asm volatile( | |
987bcdac | 37 | " stck %1\n" |
d54853ef MS |
38 | " ipm %0\n" |
39 | " srl %0,28\n" | |
987bcdac | 40 | : "=d" (cc), "=Q" (*time) : : "cc"); |
d54853ef MS |
41 | return cc; |
42 | } | |
43 | ||
44 | static inline void set_clock_comparator(__u64 time) | |
45 | { | |
987bcdac | 46 | asm volatile("sckc %0" : : "Q" (time)); |
d54853ef MS |
47 | } |
48 | ||
49 | static inline void store_clock_comparator(__u64 *time) | |
50 | { | |
987bcdac | 51 | asm volatile("stckc %0" : "=Q" (*time)); |
d54853ef MS |
52 | } |
53 | ||
17eb7a5c HC |
54 | void clock_comparator_work(void); |
55 | ||
56 | static inline unsigned long long local_tick_disable(void) | |
57 | { | |
58 | unsigned long long old; | |
59 | ||
60 | old = S390_lowcore.clock_comparator; | |
61 | S390_lowcore.clock_comparator = -1ULL; | |
62 | return old; | |
63 | } | |
64 | ||
65 | static inline void local_tick_enable(unsigned long long comp) | |
66 | { | |
67 | S390_lowcore.clock_comparator = comp; | |
68 | } | |
69 | ||
1da177e4 LT |
70 | #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ |
71 | ||
72 | typedef unsigned long long cycles_t; | |
73 | ||
1da177e4 LT |
74 | static inline unsigned long long get_clock (void) |
75 | { | |
76 | unsigned long long clk; | |
77 | ||
94c12cc7 | 78 | asm volatile("stck %0" : "=Q" (clk) : : "cc"); |
1da177e4 LT |
79 | return clk; |
80 | } | |
81 | ||
57b28f66 MH |
82 | static inline void get_clock_ext(char *clk) |
83 | { | |
84 | asm volatile("stcke %0" : "=Q" (*clk) : : "cc"); | |
85 | } | |
86 | ||
c0015f91 | 87 | static inline unsigned long long get_clock_xt(void) |
1b278294 | 88 | { |
c0015f91 | 89 | unsigned char clk[16]; |
57b28f66 | 90 | get_clock_ext(clk); |
c0015f91 | 91 | return *((unsigned long long *)&clk[1]); |
1b278294 JG |
92 | } |
93 | ||
94c12cc7 MS |
94 | static inline cycles_t get_cycles(void) |
95 | { | |
96 | return (cycles_t) get_clock() >> 2; | |
97 | } | |
98 | ||
d54853ef | 99 | int get_sync_clock(unsigned long long *clock); |
2b67fc46 | 100 | void init_cpu_timer(void); |
a806170e | 101 | unsigned long long monotonic_clock(void); |
2b67fc46 | 102 | |
b592e89a CS |
103 | void tod_to_timeval(__u64, struct timespec *); |
104 | ||
105 | static inline | |
106 | void stck_to_timespec(unsigned long long stck, struct timespec *ts) | |
107 | { | |
108 | tod_to_timeval(stck - TOD_UNIX_EPOCH, ts); | |
109 | } | |
110 | ||
b6112ccb MS |
111 | extern u64 sched_clock_base_cc; |
112 | ||
05e7ff7d HC |
113 | /** |
114 | * get_clock_monotonic - returns current time in clock rate units | |
115 | * | |
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 | |
120 | * be monotonic. | |
121 | */ | |
122 | static inline unsigned long long get_clock_monotonic(void) | |
123 | { | |
124 | return get_clock_xt() - sched_clock_base_cc; | |
125 | } | |
126 | ||
1da177e4 | 127 | #endif |