2 * QEMU 8253/8254 interval timer emulation
4 * Copyright (c) 2003-2004 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27 #include "qemu-timer.h"
31 extern VMStateDescription vmstate_pit
;
33 static PITState pit_state
;
35 static void kvm_pit_pre_save(void *opaque
)
37 PITState
*s
= (void *)opaque
;
38 struct kvm_pit_state2 pit2
;
39 struct kvm_pit_channel_state
*c
;
40 struct PITChannelState
*sc
;
43 if(qemu_kvm_has_pit_state2()) {
44 kvm_get_pit2(kvm_context
, &pit2
);
45 s
->flags
= pit2
.flags
;
47 /* pit2 is superset of pit struct so just cast it and use it */
48 kvm_get_pit(kvm_context
, (struct kvm_pit_state
*)&pit2
);
50 for (i
= 0; i
< 3; i
++) {
51 c
= &pit2
.channels
[i
];
54 sc
->latched_count
= c
->latched_count
;
55 sc
->count_latched
= c
->count_latched
;
56 sc
->status_latched
= c
->status_latched
;
57 sc
->status
= c
->status
;
58 sc
->read_state
= c
->read_state
;
59 sc
->write_state
= c
->write_state
;
60 sc
->write_latch
= c
->write_latch
;
61 sc
->rw_mode
= c
->rw_mode
;
65 sc
->count_load_time
= c
->count_load_time
;
69 static int kvm_pit_post_load(void *opaque
, int version_id
)
72 struct kvm_pit_state2 pit2
;
73 struct kvm_pit_channel_state
*c
;
74 struct PITChannelState
*sc
;
77 pit2
.flags
= s
->flags
;
78 for (i
= 0; i
< 3; i
++) {
79 c
= &pit2
.channels
[i
];
82 c
->latched_count
= sc
->latched_count
;
83 c
->count_latched
= sc
->count_latched
;
84 c
->status_latched
= sc
->status_latched
;
85 c
->status
= sc
->status
;
86 c
->read_state
= sc
->read_state
;
87 c
->write_state
= sc
->write_state
;
88 c
->write_latch
= sc
->write_latch
;
89 c
->rw_mode
= sc
->rw_mode
;
93 c
->count_load_time
= sc
->count_load_time
;
96 if(qemu_kvm_has_pit_state2()) {
97 kvm_set_pit2(kvm_context
, &pit2
);
99 kvm_set_pit(kvm_context
, (struct kvm_pit_state
*)&pit2
);
104 static void dummy_timer(void *opaque
)
108 PITState
*kvm_pit_init(int base
, qemu_irq irq
)
110 PITState
*pit
= &pit_state
;
113 s
= &pit
->channels
[0];
114 s
->irq_timer
= qemu_new_timer(vm_clock
, dummy_timer
, s
);
115 vmstate_pit
.pre_save
= kvm_pit_pre_save
;
116 vmstate_pit
.post_load
= kvm_pit_post_load
;
117 vmstate_register(base
, &vmstate_pit
, pit
);
118 qemu_register_reset(pit_reset
, pit
);