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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* xen/arch/arm/vtimer.c
*
* ARM Virtual Timer emulation support
*
* Ian Campbell <ian.campbell@citrix.com>
* Copyright (c) 2011 Citrix Systems.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <xen/config.h>
#include <xen/lib.h>
#include <xen/timer.h>
#include <xen/sched.h>
#include <asm/irq.h>
#include <asm/time.h>
#include <asm/gic.h>
#include <asm/regs.h>
extern s_time_t ticks_to_ns(uint64_t ticks);
extern uint64_t ns_to_ticks(s_time_t ns);
static void phys_timer_expired(void *data)
{
struct vtimer *t = data;
t->ctl |= CNTx_CTL_PENDING;
t->ctl &= ~CNTx_CTL_MASK;
vgic_vcpu_inject_irq(t->v, 30, 1);
}
static void virt_timer_expired(void *data)
{
struct vtimer *t = data;
t->ctl |= CNTx_CTL_MASK;
vgic_vcpu_inject_irq(t->v, 27, 1);
}
int vcpu_vtimer_init(struct vcpu *v)
{
struct vtimer *t = &v->arch.phys_timer;
init_timer(&t->timer, phys_timer_expired, t, smp_processor_id());
t->ctl = 0;
t->offset = NOW();
t->cval = NOW();
t->irq = 30;
t->v = v;
t = &v->arch.virt_timer;
init_timer(&t->timer, virt_timer_expired, t, smp_processor_id());
t->ctl = 0;
t->offset = READ_CP64(CNTVCT) + READ_CP64(CNTVOFF);
t->cval = 0;
t->irq = 27;
t->v = v;
return 0;
}
void vcpu_timer_destroy(struct vcpu *v)
{
kill_timer(&v->arch.virt_timer.timer);
kill_timer(&v->arch.phys_timer.timer);
}
int virt_timer_save(struct vcpu *v)
{
if ( is_idle_domain(v->domain) )
return 0;
v->arch.virt_timer.ctl = READ_CP32(CNTV_CTL);
WRITE_CP32(v->arch.virt_timer.ctl & ~CNTx_CTL_ENABLE, CNTV_CTL);
v->arch.virt_timer.cval = READ_CP64(CNTV_CVAL);
if ( v->arch.virt_timer.ctl & CNTx_CTL_ENABLE )
{
set_timer(&v->arch.virt_timer.timer, ticks_to_ns(v->arch.virt_timer.cval +
v->arch.virt_timer.offset - boot_count));
}
return 0;
}
int virt_timer_restore(struct vcpu *v)
{
if ( is_idle_domain(v->domain) )
return 0;
stop_timer(&v->arch.virt_timer.timer);
WRITE_CP64(v->arch.virt_timer.offset, CNTVOFF);
WRITE_CP64(v->arch.virt_timer.cval, CNTV_CVAL);
WRITE_CP32(v->arch.virt_timer.ctl, CNTV_CTL);
return 0;
}
static int vtimer_emulate_32(struct cpu_user_regs *regs, union hsr hsr)
{
struct vcpu *v = current;
struct hsr_cp32 cp32 = hsr.cp32;
uint32_t *r = select_user_reg(regs, cp32.reg);
s_time_t now;
switch ( hsr.bits & HSR_CP32_REGS_MASK )
{
case HSR_CPREG32(CNTP_CTL):
if ( cp32.read )
{
*r = v->arch.phys_timer.ctl;
}
else
{
v->arch.phys_timer.ctl = *r;
if ( v->arch.phys_timer.ctl & CNTx_CTL_ENABLE )
{
set_timer(&v->arch.phys_timer.timer,
v->arch.phys_timer.cval + v->arch.phys_timer.offset);
}
else
stop_timer(&v->arch.phys_timer.timer);
}
return 1;
case HSR_CPREG32(CNTP_TVAL):
now = NOW() - v->arch.phys_timer.offset;
if ( cp32.read )
{
*r = (uint32_t)(ns_to_ticks(v->arch.phys_timer.cval - now) & 0xffffffffull);
}
else
{
v->arch.phys_timer.cval = now + ticks_to_ns(*r);
if ( v->arch.phys_timer.ctl & CNTx_CTL_ENABLE )
{
set_timer(&v->arch.phys_timer.timer,
v->arch.phys_timer.cval + v->arch.phys_timer.offset);
}
}
return 1;
default:
return 0;
}
}
static int vtimer_emulate_64(struct cpu_user_regs *regs, union hsr hsr)
{
struct vcpu *v = current;
struct hsr_cp64 cp64 = hsr.cp64;
uint32_t *r1 = select_user_reg(regs, cp64.reg1);
uint32_t *r2 = select_user_reg(regs, cp64.reg2);
uint64_t ticks;
s_time_t now;
switch ( hsr.bits & HSR_CP64_REGS_MASK )
{
case HSR_CPREG64(CNTPCT):
if ( cp64.read )
{
now = NOW() - v->arch.phys_timer.offset;
ticks = ns_to_ticks(now);
*r1 = (uint32_t)(ticks & 0xffffffff);
*r2 = (uint32_t)(ticks >> 32);
return 1;
}
else
{
printk("READ from R/O CNTPCT\n");
return 0;
}
default:
return 0;
}
}
int vtimer_emulate(struct cpu_user_regs *regs, union hsr hsr)
{
switch (hsr.ec) {
case HSR_EC_CP15_32:
return vtimer_emulate_32(regs, hsr);
case HSR_EC_CP15_64:
return vtimer_emulate_64(regs, hsr);
default:
return 0;
}
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
|
