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1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/clockchips.h>
7#include <linux/init.h>
8#include <linux/interrupt.h>
9#include <linux/jiffies.h>
10#include <linux/threads.h>
11#include <asm/irq.h>
12#include <asm/param.h>
13#include "kern_util.h"
14#include "os.h"
15
16void timer_handler(int sig, struct uml_pt_regs *regs)
17{
18 unsigned long flags;
19
20 local_irq_save(flags);
21 do_IRQ(TIMER_IRQ, regs);
22 local_irq_restore(flags);
23}
24
25static void itimer_set_mode(enum clock_event_mode mode,
26 struct clock_event_device *evt)
27{
28 switch (mode) {
29 case CLOCK_EVT_MODE_PERIODIC:
30 set_interval();
31 break;
32
33 case CLOCK_EVT_MODE_SHUTDOWN:
34 case CLOCK_EVT_MODE_UNUSED:
35 case CLOCK_EVT_MODE_ONESHOT:
36 disable_timer();
37 break;
38
39 case CLOCK_EVT_MODE_RESUME:
40 break;
41 }
42}
43
44static int itimer_next_event(unsigned long delta,
45 struct clock_event_device *evt)
46{
47 return timer_one_shot(delta + 1);
48}
49
50static struct clock_event_device itimer_clockevent = {
51 .name = "itimer",
52 .rating = 250,
53 .cpumask = cpu_all_mask,
54 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
55 .set_mode = itimer_set_mode,
56 .set_next_event = itimer_next_event,
57 .shift = 32,
58 .irq = 0,
59};
60
61static irqreturn_t um_timer(int irq, void *dev)
62{
63 (*itimer_clockevent.event_handler)(&itimer_clockevent);
64
65 return IRQ_HANDLED;
66}
67
68static cycle_t itimer_read(struct clocksource *cs)
69{
70 return os_nsecs() / 1000;
71}
72
73static struct clocksource itimer_clocksource = {
74 .name = "itimer",
75 .rating = 300,
76 .read = itimer_read,
77 .mask = CLOCKSOURCE_MASK(64),
78 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
79};
80
81static void __init setup_itimer(void)
82{
83 int err;
84
85 err = request_irq(TIMER_IRQ, um_timer, 0, "timer", NULL);
86 if (err != 0)
87 printk(KERN_ERR "register_timer : request_irq failed - "
88 "errno = %d\n", -err);
89
90 itimer_clockevent.mult = div_sc(HZ, NSEC_PER_SEC, 32);
91 itimer_clockevent.max_delta_ns =
92 clockevent_delta2ns(60 * HZ, &itimer_clockevent);
93 itimer_clockevent.min_delta_ns =
94 clockevent_delta2ns(1, &itimer_clockevent);
95 err = clocksource_register_hz(&itimer_clocksource, USEC_PER_SEC);
96 if (err) {
97 printk(KERN_ERR "clocksource_register_hz returned %d\n", err);
98 return;
99 }
100 clockevents_register_device(&itimer_clockevent);
101}
102
103void read_persistent_clock(struct timespec *ts)
104{
105 long long nsecs = os_nsecs();
106
107 set_normalized_timespec(ts, nsecs / NSEC_PER_SEC,
108 nsecs % NSEC_PER_SEC);
109}
110
111void __init time_init(void)
112{
113 timer_init();
114 late_time_init = setup_itimer;
115}
1/*
2 * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
3 * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
4 * Copyright (C) 2012-2014 Cisco Systems
5 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
6 * Licensed under the GPL
7 */
8
9#include <linux/clockchips.h>
10#include <linux/init.h>
11#include <linux/interrupt.h>
12#include <linux/jiffies.h>
13#include <linux/mm.h>
14#include <linux/sched.h>
15#include <linux/spinlock.h>
16#include <linux/threads.h>
17#include <asm/irq.h>
18#include <asm/param.h>
19#include <kern_util.h>
20#include <os.h>
21#include <timer-internal.h>
22
23void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
24{
25 unsigned long flags;
26
27 local_irq_save(flags);
28 do_IRQ(TIMER_IRQ, regs);
29 local_irq_restore(flags);
30}
31
32static int itimer_shutdown(struct clock_event_device *evt)
33{
34 os_timer_disable();
35 return 0;
36}
37
38static int itimer_set_periodic(struct clock_event_device *evt)
39{
40 os_timer_set_interval(NULL, NULL);
41 return 0;
42}
43
44static int itimer_next_event(unsigned long delta,
45 struct clock_event_device *evt)
46{
47 return os_timer_one_shot(delta);
48}
49
50static int itimer_one_shot(struct clock_event_device *evt)
51{
52 os_timer_one_shot(1);
53 return 0;
54}
55
56static struct clock_event_device timer_clockevent = {
57 .name = "posix-timer",
58 .rating = 250,
59 .cpumask = cpu_all_mask,
60 .features = CLOCK_EVT_FEAT_PERIODIC |
61 CLOCK_EVT_FEAT_ONESHOT,
62 .set_state_shutdown = itimer_shutdown,
63 .set_state_periodic = itimer_set_periodic,
64 .set_state_oneshot = itimer_one_shot,
65 .set_next_event = itimer_next_event,
66 .shift = 0,
67 .max_delta_ns = 0xffffffff,
68 .min_delta_ns = TIMER_MIN_DELTA, //microsecond resolution should be enough for anyone, same as 640K RAM
69 .irq = 0,
70 .mult = 1,
71};
72
73static irqreturn_t um_timer(int irq, void *dev)
74{
75 if (get_current()->mm != NULL)
76 {
77 /* userspace - relay signal, results in correct userspace timers */
78 os_alarm_process(get_current()->mm->context.id.u.pid);
79 }
80
81 (*timer_clockevent.event_handler)(&timer_clockevent);
82
83 return IRQ_HANDLED;
84}
85
86static cycle_t timer_read(struct clocksource *cs)
87{
88 return os_nsecs() / TIMER_MULTIPLIER;
89}
90
91static struct clocksource timer_clocksource = {
92 .name = "timer",
93 .rating = 300,
94 .read = timer_read,
95 .mask = CLOCKSOURCE_MASK(64),
96 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
97};
98
99static void __init timer_setup(void)
100{
101 int err;
102
103 err = request_irq(TIMER_IRQ, um_timer, IRQF_TIMER, "hr timer", NULL);
104 if (err != 0)
105 printk(KERN_ERR "register_timer : request_irq failed - "
106 "errno = %d\n", -err);
107
108 err = os_timer_create(NULL);
109 if (err != 0) {
110 printk(KERN_ERR "creation of timer failed - errno = %d\n", -err);
111 return;
112 }
113
114 err = clocksource_register_hz(&timer_clocksource, NSEC_PER_SEC/TIMER_MULTIPLIER);
115 if (err) {
116 printk(KERN_ERR "clocksource_register_hz returned %d\n", err);
117 return;
118 }
119 clockevents_register_device(&timer_clockevent);
120}
121
122void read_persistent_clock(struct timespec *ts)
123{
124 long long nsecs = os_persistent_clock_emulation();
125
126 set_normalized_timespec(ts, nsecs / NSEC_PER_SEC,
127 nsecs % NSEC_PER_SEC);
128}
129
130void __init time_init(void)
131{
132 timer_set_signal_handler();
133 late_time_init = timer_setup;
134}