Loading...
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999
5 *
6 * Derived from "include/asm-i386/timex.h"
7 * Copyright (C) 1992, Linus Torvalds
8 */
9
10#ifndef _ASM_S390_TIMEX_H
11#define _ASM_S390_TIMEX_H
12
13#include <linux/preempt.h>
14#include <linux/time64.h>
15#include <asm/lowcore.h>
16
17/* The value of the TOD clock for 1.1.1970. */
18#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
19
20extern u64 clock_comparator_max;
21
22union tod_clock {
23 __uint128_t val;
24 struct {
25 __uint128_t ei : 8; /* epoch index */
26 __uint128_t tod : 64; /* bits 0-63 of tod clock */
27 __uint128_t : 40;
28 __uint128_t pf : 16; /* programmable field */
29 };
30 struct {
31 __uint128_t eitod : 72; /* epoch index + bits 0-63 tod clock */
32 __uint128_t : 56;
33 };
34 struct {
35 __uint128_t us : 60; /* micro-seconds */
36 __uint128_t sus : 12; /* sub-microseconds */
37 __uint128_t : 56;
38 };
39} __packed;
40
41/* Inline functions for clock register access. */
42static inline int set_tod_clock(__u64 time)
43{
44 int cc;
45
46 asm volatile(
47 " sck %1\n"
48 " ipm %0\n"
49 " srl %0,28\n"
50 : "=d" (cc) : "Q" (time) : "cc");
51 return cc;
52}
53
54static inline int store_tod_clock_ext_cc(union tod_clock *clk)
55{
56 int cc;
57
58 asm volatile(
59 " stcke %1\n"
60 " ipm %0\n"
61 " srl %0,28\n"
62 : "=d" (cc), "=Q" (*clk) : : "cc");
63 return cc;
64}
65
66static inline void store_tod_clock_ext(union tod_clock *tod)
67{
68 asm volatile("stcke %0" : "=Q" (*tod) : : "cc");
69}
70
71static inline void set_clock_comparator(__u64 time)
72{
73 asm volatile("sckc %0" : : "Q" (time));
74}
75
76static inline void set_tod_programmable_field(u16 val)
77{
78 asm volatile(
79 " lgr 0,%[val]\n"
80 " sckpf\n"
81 :
82 : [val] "d" ((unsigned long)val)
83 : "0");
84}
85
86void clock_comparator_work(void);
87
88void __init time_early_init(void);
89
90extern unsigned char ptff_function_mask[16];
91
92/* Function codes for the ptff instruction. */
93#define PTFF_QAF 0x00 /* query available functions */
94#define PTFF_QTO 0x01 /* query tod offset */
95#define PTFF_QSI 0x02 /* query steering information */
96#define PTFF_QUI 0x04 /* query UTC information */
97#define PTFF_ATO 0x40 /* adjust tod offset */
98#define PTFF_STO 0x41 /* set tod offset */
99#define PTFF_SFS 0x42 /* set fine steering rate */
100#define PTFF_SGS 0x43 /* set gross steering rate */
101
102/* Query TOD offset result */
103struct ptff_qto {
104 unsigned long physical_clock;
105 unsigned long tod_offset;
106 unsigned long logical_tod_offset;
107 unsigned long tod_epoch_difference;
108} __packed;
109
110static inline int ptff_query(unsigned int nr)
111{
112 unsigned char *ptr;
113
114 ptr = ptff_function_mask + (nr >> 3);
115 return (*ptr & (0x80 >> (nr & 7))) != 0;
116}
117
118/* Query UTC information result */
119struct ptff_qui {
120 unsigned int tm : 2;
121 unsigned int ts : 2;
122 unsigned int : 28;
123 unsigned int pad_0x04;
124 unsigned long leap_event;
125 short old_leap;
126 short new_leap;
127 unsigned int pad_0x14;
128 unsigned long prt[5];
129 unsigned long cst[3];
130 unsigned int skew;
131 unsigned int pad_0x5c[41];
132} __packed;
133
134/*
135 * ptff - Perform timing facility function
136 * @ptff_block: Pointer to ptff parameter block
137 * @len: Length of parameter block
138 * @func: Function code
139 * Returns: Condition code (0 on success)
140 */
141#define ptff(ptff_block, len, func) \
142({ \
143 struct addrtype { char _[len]; }; \
144 unsigned int reg0 = func; \
145 unsigned long reg1 = (unsigned long)(ptff_block); \
146 int rc; \
147 \
148 asm volatile( \
149 " lgr 0,%[reg0]\n" \
150 " lgr 1,%[reg1]\n" \
151 " ptff\n" \
152 " ipm %[rc]\n" \
153 " srl %[rc],28\n" \
154 : [rc] "=&d" (rc), "+m" (*(struct addrtype *)reg1) \
155 : [reg0] "d" (reg0), [reg1] "d" (reg1) \
156 : "cc", "0", "1"); \
157 rc; \
158})
159
160static inline unsigned long local_tick_disable(void)
161{
162 unsigned long old;
163
164 old = S390_lowcore.clock_comparator;
165 S390_lowcore.clock_comparator = clock_comparator_max;
166 set_clock_comparator(S390_lowcore.clock_comparator);
167 return old;
168}
169
170static inline void local_tick_enable(unsigned long comp)
171{
172 S390_lowcore.clock_comparator = comp;
173 set_clock_comparator(S390_lowcore.clock_comparator);
174}
175
176#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
177
178typedef unsigned long cycles_t;
179
180static inline unsigned long get_tod_clock(void)
181{
182 union tod_clock clk;
183
184 store_tod_clock_ext(&clk);
185 return clk.tod;
186}
187
188static inline unsigned long get_tod_clock_fast(void)
189{
190 unsigned long clk;
191
192 asm volatile("stckf %0" : "=Q" (clk) : : "cc");
193 return clk;
194}
195
196static inline cycles_t get_cycles(void)
197{
198 return (cycles_t) get_tod_clock() >> 2;
199}
200#define get_cycles get_cycles
201
202int get_phys_clock(unsigned long *clock);
203void init_cpu_timer(void);
204
205extern union tod_clock tod_clock_base;
206
207/**
208 * get_clock_monotonic - returns current time in clock rate units
209 *
210 * The clock and tod_clock_base get changed via stop_machine.
211 * Therefore preemption must be disabled, otherwise the returned
212 * value is not guaranteed to be monotonic.
213 */
214static inline unsigned long get_tod_clock_monotonic(void)
215{
216 unsigned long tod;
217
218 preempt_disable_notrace();
219 tod = get_tod_clock() - tod_clock_base.tod;
220 preempt_enable_notrace();
221 return tod;
222}
223
224/**
225 * tod_to_ns - convert a TOD format value to nanoseconds
226 * @todval: to be converted TOD format value
227 * Returns: number of nanoseconds that correspond to the TOD format value
228 *
229 * Converting a 64 Bit TOD format value to nanoseconds means that the value
230 * must be divided by 4.096. In order to achieve that we multiply with 125
231 * and divide by 512:
232 *
233 * ns = (todval * 125) >> 9;
234 *
235 * In order to avoid an overflow with the multiplication we can rewrite this.
236 * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits)
237 * we end up with
238 *
239 * ns = ((2^9 * th + tl) * 125 ) >> 9;
240 * -> ns = (th * 125) + ((tl * 125) >> 9);
241 *
242 */
243static inline unsigned long tod_to_ns(unsigned long todval)
244{
245 return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9);
246}
247
248/**
249 * tod_after - compare two 64 bit TOD values
250 * @a: first 64 bit TOD timestamp
251 * @b: second 64 bit TOD timestamp
252 *
253 * Returns: true if a is later than b
254 */
255static inline int tod_after(unsigned long a, unsigned long b)
256{
257 if (MACHINE_HAS_SCC)
258 return (long) a > (long) b;
259 return a > b;
260}
261
262/**
263 * tod_after_eq - compare two 64 bit TOD values
264 * @a: first 64 bit TOD timestamp
265 * @b: second 64 bit TOD timestamp
266 *
267 * Returns: true if a is later than b
268 */
269static inline int tod_after_eq(unsigned long a, unsigned long b)
270{
271 if (MACHINE_HAS_SCC)
272 return (long) a >= (long) b;
273 return a >= b;
274}
275
276#endif
1/*
2 * S390 version
3 * Copyright IBM Corp. 1999
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
12#include <asm/lowcore.h>
13#include <linux/time64.h>
14
15/* The value of the TOD clock for 1.1.1970. */
16#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
17
18/* Inline functions for clock register access. */
19static inline int set_tod_clock(__u64 time)
20{
21 int cc;
22
23 asm volatile(
24 " sck %1\n"
25 " ipm %0\n"
26 " srl %0,28\n"
27 : "=d" (cc) : "Q" (time) : "cc");
28 return cc;
29}
30
31static inline int store_tod_clock(__u64 *time)
32{
33 int cc;
34
35 asm volatile(
36 " stck %1\n"
37 " ipm %0\n"
38 " srl %0,28\n"
39 : "=d" (cc), "=Q" (*time) : : "cc");
40 return cc;
41}
42
43static inline void set_clock_comparator(__u64 time)
44{
45 asm volatile("sckc %0" : : "Q" (time));
46}
47
48static inline void store_clock_comparator(__u64 *time)
49{
50 asm volatile("stckc %0" : "=Q" (*time));
51}
52
53void clock_comparator_work(void);
54
55static inline unsigned long long local_tick_disable(void)
56{
57 unsigned long long old;
58
59 old = S390_lowcore.clock_comparator;
60 S390_lowcore.clock_comparator = -1ULL;
61 set_clock_comparator(S390_lowcore.clock_comparator);
62 return old;
63}
64
65static inline void local_tick_enable(unsigned long long comp)
66{
67 S390_lowcore.clock_comparator = comp;
68 set_clock_comparator(S390_lowcore.clock_comparator);
69}
70
71#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
72#define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */
73
74typedef unsigned long long cycles_t;
75
76static inline void get_tod_clock_ext(char *clk)
77{
78 typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype;
79
80 asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc");
81}
82
83static inline unsigned long long get_tod_clock(void)
84{
85 unsigned char clk[STORE_CLOCK_EXT_SIZE];
86
87 get_tod_clock_ext(clk);
88 return *((unsigned long long *)&clk[1]);
89}
90
91static inline unsigned long long get_tod_clock_fast(void)
92{
93#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
94 unsigned long long clk;
95
96 asm volatile("stckf %0" : "=Q" (clk) : : "cc");
97 return clk;
98#else
99 return get_tod_clock();
100#endif
101}
102
103static inline cycles_t get_cycles(void)
104{
105 return (cycles_t) get_tod_clock() >> 2;
106}
107
108int get_sync_clock(unsigned long long *clock);
109void init_cpu_timer(void);
110unsigned long long monotonic_clock(void);
111
112void tod_to_timeval(__u64 todval, struct timespec64 *xt);
113
114static inline
115void stck_to_timespec64(unsigned long long stck, struct timespec64 *ts)
116{
117 tod_to_timeval(stck - TOD_UNIX_EPOCH, ts);
118}
119
120extern u64 sched_clock_base_cc;
121
122/**
123 * get_clock_monotonic - returns current time in clock rate units
124 *
125 * The caller must ensure that preemption is disabled.
126 * The clock and sched_clock_base get changed via stop_machine.
127 * Therefore preemption must be disabled when calling this
128 * function, otherwise the returned value is not guaranteed to
129 * be monotonic.
130 */
131static inline unsigned long long get_tod_clock_monotonic(void)
132{
133 return get_tod_clock() - sched_clock_base_cc;
134}
135
136/**
137 * tod_to_ns - convert a TOD format value to nanoseconds
138 * @todval: to be converted TOD format value
139 * Returns: number of nanoseconds that correspond to the TOD format value
140 *
141 * Converting a 64 Bit TOD format value to nanoseconds means that the value
142 * must be divided by 4.096. In order to achieve that we multiply with 125
143 * and divide by 512:
144 *
145 * ns = (todval * 125) >> 9;
146 *
147 * In order to avoid an overflow with the multiplication we can rewrite this.
148 * With a split todval == 2^32 * th + tl (th upper 32 bits, tl lower 32 bits)
149 * we end up with
150 *
151 * ns = ((2^32 * th + tl) * 125 ) >> 9;
152 * -> ns = (2^23 * th * 125) + ((tl * 125) >> 9);
153 *
154 */
155static inline unsigned long long tod_to_ns(unsigned long long todval)
156{
157 unsigned long long ns;
158
159 ns = ((todval >> 32) << 23) * 125;
160 ns += ((todval & 0xffffffff) * 125) >> 9;
161 return ns;
162}
163
164#endif