Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Heiko Carstens | 17eb7a5 | 2011-01-05 12:47:26 +0100 | [diff] [blame] | 14 | #include <asm/lowcore.h> |
| 15 | |
Martin Schwidefsky | b6112cc | 2009-04-14 15:36:28 +0200 | [diff] [blame] | 16 | /* The value of the TOD clock for 1.1.1970. */ |
| 17 | #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL |
| 18 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 19 | /* Inline functions for clock register access. */ |
| 20 | static inline int set_clock(__u64 time) |
| 21 | { |
| 22 | int cc; |
| 23 | |
| 24 | asm volatile( |
Martin Schwidefsky | 987bcda | 2010-02-26 22:37:31 +0100 | [diff] [blame] | 25 | " sck %1\n" |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 26 | " ipm %0\n" |
| 27 | " srl %0,28\n" |
Martin Schwidefsky | 987bcda | 2010-02-26 22:37:31 +0100 | [diff] [blame] | 28 | : "=d" (cc) : "Q" (time) : "cc"); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 29 | return cc; |
| 30 | } |
| 31 | |
| 32 | static inline int store_clock(__u64 *time) |
| 33 | { |
| 34 | int cc; |
| 35 | |
| 36 | asm volatile( |
Martin Schwidefsky | 987bcda | 2010-02-26 22:37:31 +0100 | [diff] [blame] | 37 | " stck %1\n" |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 38 | " ipm %0\n" |
| 39 | " srl %0,28\n" |
Martin Schwidefsky | 987bcda | 2010-02-26 22:37:31 +0100 | [diff] [blame] | 40 | : "=d" (cc), "=Q" (*time) : : "cc"); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 41 | return cc; |
| 42 | } |
| 43 | |
| 44 | static inline void set_clock_comparator(__u64 time) |
| 45 | { |
Martin Schwidefsky | 987bcda | 2010-02-26 22:37:31 +0100 | [diff] [blame] | 46 | asm volatile("sckc %0" : : "Q" (time)); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 47 | } |
| 48 | |
| 49 | static inline void store_clock_comparator(__u64 *time) |
| 50 | { |
Martin Schwidefsky | 987bcda | 2010-02-26 22:37:31 +0100 | [diff] [blame] | 51 | asm volatile("stckc %0" : "=Q" (*time)); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 52 | } |
| 53 | |
Heiko Carstens | 17eb7a5 | 2011-01-05 12:47:26 +0100 | [diff] [blame] | 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; |
Heiko Carstens | 545b288 | 2011-01-05 12:47:27 +0100 | [diff] [blame] | 62 | set_clock_comparator(S390_lowcore.clock_comparator); |
Heiko Carstens | 17eb7a5 | 2011-01-05 12:47:26 +0100 | [diff] [blame] | 63 | return old; |
| 64 | } |
| 65 | |
| 66 | static inline void local_tick_enable(unsigned long long comp) |
| 67 | { |
| 68 | S390_lowcore.clock_comparator = comp; |
Heiko Carstens | 545b288 | 2011-01-05 12:47:27 +0100 | [diff] [blame] | 69 | set_clock_comparator(S390_lowcore.clock_comparator); |
Heiko Carstens | 17eb7a5 | 2011-01-05 12:47:26 +0100 | [diff] [blame] | 70 | } |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */ |
| 73 | |
| 74 | typedef unsigned long long cycles_t; |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | static inline unsigned long long get_clock (void) |
| 77 | { |
| 78 | unsigned long long clk; |
| 79 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 80 | asm volatile("stck %0" : "=Q" (clk) : : "cc"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | return clk; |
| 82 | } |
| 83 | |
Michael Holzheu | 57b28f6 | 2010-05-17 10:00:20 +0200 | [diff] [blame] | 84 | static inline void get_clock_ext(char *clk) |
| 85 | { |
| 86 | asm volatile("stcke %0" : "=Q" (*clk) : : "cc"); |
| 87 | } |
| 88 | |
Jan Glauber | 80376f3 | 2011-10-30 15:17:04 +0100 | [diff] [blame^] | 89 | static inline unsigned long long get_clock_fast(void) |
| 90 | { |
| 91 | unsigned long long clk; |
| 92 | |
| 93 | if (test_facility(25)) |
| 94 | asm volatile(".insn s,0xb27c0000,%0" : "=Q" (clk) : : "cc"); |
| 95 | else |
| 96 | clk = get_clock(); |
| 97 | return clk; |
| 98 | } |
| 99 | |
Jan Glauber | c0015f9 | 2008-04-17 07:46:16 +0200 | [diff] [blame] | 100 | static inline unsigned long long get_clock_xt(void) |
Jan Glauber | 1b27829 | 2007-02-05 21:18:22 +0100 | [diff] [blame] | 101 | { |
Jan Glauber | c0015f9 | 2008-04-17 07:46:16 +0200 | [diff] [blame] | 102 | unsigned char clk[16]; |
Michael Holzheu | 57b28f6 | 2010-05-17 10:00:20 +0200 | [diff] [blame] | 103 | get_clock_ext(clk); |
Jan Glauber | c0015f9 | 2008-04-17 07:46:16 +0200 | [diff] [blame] | 104 | return *((unsigned long long *)&clk[1]); |
Jan Glauber | 1b27829 | 2007-02-05 21:18:22 +0100 | [diff] [blame] | 105 | } |
| 106 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 107 | static inline cycles_t get_cycles(void) |
| 108 | { |
| 109 | return (cycles_t) get_clock() >> 2; |
| 110 | } |
| 111 | |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 112 | int get_sync_clock(unsigned long long *clock); |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 113 | void init_cpu_timer(void); |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 114 | unsigned long long monotonic_clock(void); |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 115 | |
Christof Schmitt | b592e89 | 2009-08-18 15:43:31 +0200 | [diff] [blame] | 116 | void tod_to_timeval(__u64, struct timespec *); |
| 117 | |
| 118 | static inline |
| 119 | void stck_to_timespec(unsigned long long stck, struct timespec *ts) |
| 120 | { |
| 121 | tod_to_timeval(stck - TOD_UNIX_EPOCH, ts); |
| 122 | } |
| 123 | |
Martin Schwidefsky | b6112cc | 2009-04-14 15:36:28 +0200 | [diff] [blame] | 124 | extern u64 sched_clock_base_cc; |
| 125 | |
Heiko Carstens | 05e7ff7 | 2009-09-11 10:28:31 +0200 | [diff] [blame] | 126 | /** |
| 127 | * get_clock_monotonic - returns current time in clock rate units |
| 128 | * |
| 129 | * The caller must ensure that preemption is disabled. |
| 130 | * The clock and sched_clock_base get changed via stop_machine. |
| 131 | * Therefore preemption must be disabled when calling this |
| 132 | * function, otherwise the returned value is not guaranteed to |
| 133 | * be monotonic. |
| 134 | */ |
| 135 | static inline unsigned long long get_clock_monotonic(void) |
| 136 | { |
| 137 | return get_clock_xt() - sched_clock_base_cc; |
| 138 | } |
| 139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | #endif |