1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
* Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
* Copyright (C) 2012-2014 Cisco Systems
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#include <linux/clockchips.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/threads.h>
#include <asm/irq.h>
#include <asm/param.h>
#include <kern_util.h>
#include <os.h>
#include <timer-internal.h>
void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
unsigned long flags;
local_irq_save(flags);
do_IRQ(TIMER_IRQ, regs);
local_irq_restore(flags);
}
static int itimer_shutdown(struct clock_event_device *evt)
{
os_timer_disable();
return 0;
}
static int itimer_set_periodic(struct clock_event_device *evt)
{
os_timer_set_interval(NULL, NULL);
return 0;
}
static int itimer_next_event(unsigned long delta,
struct clock_event_device *evt)
{
return os_timer_one_shot(delta);
}
static int itimer_one_shot(struct clock_event_device *evt)
{
os_timer_one_shot(1);
return 0;
}
static struct clock_event_device timer_clockevent = {
.name = "posix-timer",
.rating = 250,
.cpumask = cpu_all_mask,
.features = CLOCK_EVT_FEAT_PERIODIC |
CLOCK_EVT_FEAT_ONESHOT,
.set_state_shutdown = itimer_shutdown,
.set_state_periodic = itimer_set_periodic,
.set_state_oneshot = itimer_one_shot,
.set_next_event = itimer_next_event,
.shift = 0,
.max_delta_ns = 0xffffffff,
.max_delta_ticks = 0xffffffff,
.min_delta_ns = TIMER_MIN_DELTA,
.min_delta_ticks = TIMER_MIN_DELTA, // microsecond resolution should be enough for anyone, same as 640K RAM
.irq = 0,
.mult = 1,
};
static irqreturn_t um_timer(int irq, void *dev)
{
if (get_current()->mm != NULL)
{
/* userspace - relay signal, results in correct userspace timers */
os_alarm_process(get_current()->mm->context.id.u.pid);
}
(*timer_clockevent.event_handler)(&timer_clockevent);
return IRQ_HANDLED;
}
static u64 timer_read(struct clocksource *cs)
{
return os_nsecs() / TIMER_MULTIPLIER;
}
static struct clocksource timer_clocksource = {
.name = "timer",
.rating = 300,
.read = timer_read,
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void __init um_timer_setup(void)
{
int err;
err = request_irq(TIMER_IRQ, um_timer, IRQF_TIMER, "hr timer", NULL);
if (err != 0)
printk(KERN_ERR "register_timer : request_irq failed - "
"errno = %d\n", -err);
err = os_timer_create(NULL);
if (err != 0) {
printk(KERN_ERR "creation of timer failed - errno = %d\n", -err);
return;
}
err = clocksource_register_hz(&timer_clocksource, NSEC_PER_SEC/TIMER_MULTIPLIER);
if (err) {
printk(KERN_ERR "clocksource_register_hz returned %d\n", err);
return;
}
clockevents_register_device(&timer_clockevent);
}
void read_persistent_clock(struct timespec *ts)
{
long long nsecs = os_persistent_clock_emulation();
set_normalized_timespec(ts, nsecs / NSEC_PER_SEC,
nsecs % NSEC_PER_SEC);
}
void __init time_init(void)
{
timer_set_signal_handler();
late_time_init = um_timer_setup;
}
|
