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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | * S390 version |
a53c8fab | 3 | * Copyright IBM Corp. 1999 |
1da177e4 LT |
4 | * |
5 | * Derived from "include/asm-i386/timex.h" | |
6 | * Copyright (C) 1992, Linus Torvalds | |
7 | */ | |
8 | ||
9 | #ifndef _ASM_S390_TIMEX_H | |
10 | #define _ASM_S390_TIMEX_H | |
11 | ||
17eb7a5c HC |
12 | #include <asm/lowcore.h> |
13 | ||
b6112ccb MS |
14 | /* The value of the TOD clock for 1.1.1970. */ |
15 | #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL | |
16 | ||
d54853ef | 17 | /* Inline functions for clock register access. */ |
1aae0560 | 18 | static inline int set_tod_clock(__u64 time) |
d54853ef MS |
19 | { |
20 | int cc; | |
21 | ||
22 | asm volatile( | |
987bcdac | 23 | " sck %1\n" |
d54853ef MS |
24 | " ipm %0\n" |
25 | " srl %0,28\n" | |
987bcdac | 26 | : "=d" (cc) : "Q" (time) : "cc"); |
d54853ef MS |
27 | return cc; |
28 | } | |
29 | ||
1aae0560 | 30 | static inline int store_tod_clock(__u64 *time) |
d54853ef MS |
31 | { |
32 | int cc; | |
33 | ||
34 | asm volatile( | |
987bcdac | 35 | " stck %1\n" |
d54853ef MS |
36 | " ipm %0\n" |
37 | " srl %0,28\n" | |
987bcdac | 38 | : "=d" (cc), "=Q" (*time) : : "cc"); |
d54853ef MS |
39 | return cc; |
40 | } | |
41 | ||
42 | static inline void set_clock_comparator(__u64 time) | |
43 | { | |
987bcdac | 44 | asm volatile("sckc %0" : : "Q" (time)); |
d54853ef MS |
45 | } |
46 | ||
47 | static inline void store_clock_comparator(__u64 *time) | |
48 | { | |
987bcdac | 49 | asm volatile("stckc %0" : "=Q" (*time)); |
d54853ef MS |
50 | } |
51 | ||
17eb7a5c HC |
52 | void clock_comparator_work(void); |
53 | ||
54 | static inline unsigned long long local_tick_disable(void) | |
55 | { | |
56 | unsigned long long old; | |
57 | ||
58 | old = S390_lowcore.clock_comparator; | |
59 | S390_lowcore.clock_comparator = -1ULL; | |
545b288d | 60 | set_clock_comparator(S390_lowcore.clock_comparator); |
17eb7a5c HC |
61 | return old; |
62 | } | |
63 | ||
64 | static inline void local_tick_enable(unsigned long long comp) | |
65 | { | |
66 | S390_lowcore.clock_comparator = comp; | |
545b288d | 67 | set_clock_comparator(S390_lowcore.clock_comparator); |
17eb7a5c HC |
68 | } |
69 | ||
e38f9781 CG |
70 | #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ |
71 | #define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */ | |
1da177e4 LT |
72 | |
73 | typedef unsigned long long cycles_t; | |
74 | ||
e38f9781 | 75 | static inline void get_tod_clock_ext(char *clk) |
57b28f66 | 76 | { |
e38f9781 | 77 | typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype; |
7ab64a85 MS |
78 | |
79 | asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc"); | |
57b28f66 MH |
80 | } |
81 | ||
8c071b0f | 82 | static inline unsigned long long get_tod_clock(void) |
1b278294 | 83 | { |
e38f9781 CG |
84 | unsigned char clk[STORE_CLOCK_EXT_SIZE]; |
85 | ||
1aae0560 | 86 | get_tod_clock_ext(clk); |
c0015f91 | 87 | return *((unsigned long long *)&clk[1]); |
1b278294 JG |
88 | } |
89 | ||
8c071b0f MS |
90 | static inline unsigned long long get_tod_clock_fast(void) |
91 | { | |
92 | #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES | |
93 | unsigned long long clk; | |
94 | ||
95 | asm volatile("stckf %0" : "=Q" (clk) : : "cc"); | |
96 | return clk; | |
97 | #else | |
98 | return get_tod_clock(); | |
99 | #endif | |
100 | } | |
101 | ||
94c12cc7 MS |
102 | static inline cycles_t get_cycles(void) |
103 | { | |
1aae0560 | 104 | return (cycles_t) get_tod_clock() >> 2; |
94c12cc7 MS |
105 | } |
106 | ||
d54853ef | 107 | int get_sync_clock(unsigned long long *clock); |
2b67fc46 | 108 | void init_cpu_timer(void); |
a806170e | 109 | unsigned long long monotonic_clock(void); |
2b67fc46 | 110 | |
b592e89a CS |
111 | void tod_to_timeval(__u64, struct timespec *); |
112 | ||
113 | static inline | |
114 | void stck_to_timespec(unsigned long long stck, struct timespec *ts) | |
115 | { | |
116 | tod_to_timeval(stck - TOD_UNIX_EPOCH, ts); | |
117 | } | |
118 | ||
b6112ccb MS |
119 | extern u64 sched_clock_base_cc; |
120 | ||
05e7ff7d HC |
121 | /** |
122 | * get_clock_monotonic - returns current time in clock rate units | |
123 | * | |
124 | * The caller must ensure that preemption is disabled. | |
125 | * The clock and sched_clock_base get changed via stop_machine. | |
126 | * Therefore preemption must be disabled when calling this | |
127 | * function, otherwise the returned value is not guaranteed to | |
128 | * be monotonic. | |
129 | */ | |
1aae0560 | 130 | static inline unsigned long long get_tod_clock_monotonic(void) |
05e7ff7d | 131 | { |
8c071b0f | 132 | return get_tod_clock() - sched_clock_base_cc; |
05e7ff7d HC |
133 | } |
134 | ||
ed4f2094 HC |
135 | /** |
136 | * tod_to_ns - convert a TOD format value to nanoseconds | |
137 | * @todval: to be converted TOD format value | |
138 | * Returns: number of nanoseconds that correspond to the TOD format value | |
139 | * | |
140 | * Converting a 64 Bit TOD format value to nanoseconds means that the value | |
141 | * must be divided by 4.096. In order to achieve that we multiply with 125 | |
142 | * and divide by 512: | |
143 | * | |
144 | * ns = (todval * 125) >> 9; | |
145 | * | |
146 | * In order to avoid an overflow with the multiplication we can rewrite this. | |
147 | * With a split todval == 2^32 * th + tl (th upper 32 bits, tl lower 32 bits) | |
148 | * we end up with | |
149 | * | |
150 | * ns = ((2^32 * th + tl) * 125 ) >> 9; | |
151 | * -> ns = (2^23 * th * 125) + ((tl * 125) >> 9); | |
152 | * | |
153 | */ | |
154 | static inline unsigned long long tod_to_ns(unsigned long long todval) | |
155 | { | |
156 | unsigned long long ns; | |
157 | ||
158 | ns = ((todval >> 32) << 23) * 125; | |
159 | ns += ((todval & 0xffffffff) * 125) >> 9; | |
160 | return ns; | |
161 | } | |
162 | ||
1da177e4 | 163 | #endif |