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
137
138
139
140
141
142
143
144
145
|
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2016 Imagination Technologies
*/
#include "qemu/osdep.h"
#include "qemu/timer.h"
#include "hw/timer/mips_gictimer.h"
#define TIMER_PERIOD 10 /* 10 ns period for 100 Mhz frequency */
uint32_t mips_gictimer_get_freq(MIPSGICTimerState *gic)
{
return NANOSECONDS_PER_SECOND / TIMER_PERIOD;
}
static void gic_vptimer_update(MIPSGICTimerState *gictimer,
uint32_t vp_index, uint64_t now)
{
uint64_t next;
uint32_t wait;
wait = gictimer->vptimers[vp_index].comparelo - gictimer->sh_counterlo -
(uint32_t)(now / TIMER_PERIOD);
next = now + (uint64_t)wait * TIMER_PERIOD;
timer_mod(gictimer->vptimers[vp_index].qtimer, next);
}
static void gic_vptimer_expire(MIPSGICTimerState *gictimer, uint32_t vp_index,
uint64_t now)
{
if (gictimer->countstop) {
/* timer stopped */
return;
}
gictimer->cb(gictimer->opaque, vp_index);
gic_vptimer_update(gictimer, vp_index, now);
}
static void gic_vptimer_cb(void *opaque)
{
MIPSGICTimerVPState *vptimer = opaque;
MIPSGICTimerState *gictimer = vptimer->gictimer;
gic_vptimer_expire(gictimer, vptimer->vp_index,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
}
uint32_t mips_gictimer_get_sh_count(MIPSGICTimerState *gictimer)
{
int i;
if (gictimer->countstop) {
return gictimer->sh_counterlo;
} else {
uint64_t now;
now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
for (i = 0; i < gictimer->num_vps; i++) {
if (timer_pending(gictimer->vptimers[i].qtimer)
&& timer_expired(gictimer->vptimers[i].qtimer, now)) {
/* The timer has already expired. */
gic_vptimer_expire(gictimer, i, now);
}
}
return gictimer->sh_counterlo + (uint32_t)(now / TIMER_PERIOD);
}
}
void mips_gictimer_store_sh_count(MIPSGICTimerState *gictimer, uint64_t count)
{
int i;
uint64_t now;
if (gictimer->countstop || !gictimer->vptimers[0].qtimer) {
gictimer->sh_counterlo = count;
} else {
/* Store new count register */
now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
gictimer->sh_counterlo = count - (uint32_t)(now / TIMER_PERIOD);
/* Update timer timer */
for (i = 0; i < gictimer->num_vps; i++) {
gic_vptimer_update(gictimer, i, now);
}
}
}
uint32_t mips_gictimer_get_vp_compare(MIPSGICTimerState *gictimer,
uint32_t vp_index)
{
return gictimer->vptimers[vp_index].comparelo;
}
void mips_gictimer_store_vp_compare(MIPSGICTimerState *gictimer,
uint32_t vp_index, uint64_t compare)
{
gictimer->vptimers[vp_index].comparelo = (uint32_t) compare;
gic_vptimer_update(gictimer, vp_index,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
}
uint8_t mips_gictimer_get_countstop(MIPSGICTimerState *gictimer)
{
return gictimer->countstop;
}
void mips_gictimer_start_count(MIPSGICTimerState *gictimer)
{
gictimer->countstop = 0;
mips_gictimer_store_sh_count(gictimer, gictimer->sh_counterlo);
}
void mips_gictimer_stop_count(MIPSGICTimerState *gictimer)
{
int i;
gictimer->countstop = 1;
/* Store the current value */
gictimer->sh_counterlo +=
(uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) / TIMER_PERIOD);
for (i = 0; i < gictimer->num_vps; i++) {
timer_del(gictimer->vptimers[i].qtimer);
}
}
MIPSGICTimerState *mips_gictimer_init(void *opaque, uint32_t nvps,
MIPSGICTimerCB *cb)
{
int i;
MIPSGICTimerState *gictimer = g_new(MIPSGICTimerState, 1);
gictimer->vptimers = g_new(MIPSGICTimerVPState, nvps);
gictimer->countstop = 1;
gictimer->num_vps = nvps;
gictimer->opaque = opaque;
gictimer->cb = cb;
for (i = 0; i < nvps; i++) {
gictimer->vptimers[i].gictimer = gictimer;
gictimer->vptimers[i].vp_index = i;
gictimer->vptimers[i].qtimer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
&gic_vptimer_cb,
&gictimer->vptimers[i]);
}
return gictimer;
}
|
