1/*
2 * QEMU simulated pvpanic device.
3 *
4 * Copyright Fujitsu, Corp. 2013
5 *
6 * Authors:
7 * Wen Congyang <wency@cn.fujitsu.com>
8 * Hu Tao <hutao@cn.fujitsu.com>
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
12 *
13 */
14
15#include "qemu/osdep.h"
16#include "qemu/log.h"
17#include "qemu/module.h"
18#include "sysemu/runstate.h"
19
20#include "hw/nvram/fw_cfg.h"
21#include "hw/qdev-properties.h"
22#include "hw/misc/pvpanic.h"
23
24/* The bit of supported pv event */
25#define PVPANIC_F_PANICKED 0
26
27/* The pv event value */
28#define PVPANIC_PANICKED (1 << PVPANIC_F_PANICKED)
29
30#define ISA_PVPANIC_DEVICE(obj) \
31 OBJECT_CHECK(PVPanicState, (obj), TYPE_PVPANIC)
32
33static void handle_event(int event)
34{
35 static bool logged;
36
37 if (event & ~PVPANIC_PANICKED && !logged) {
38 qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event);
39 logged = true;
40 }
41
42 if (event & PVPANIC_PANICKED) {
43 qemu_system_guest_panicked(NULL);
44 return;
45 }
46}
47
48#include "hw/isa/isa.h"
49
50typedef struct PVPanicState {
51 ISADevice parent_obj;
52
53 MemoryRegion io;
54 uint16_t ioport;
55} PVPanicState;
56
57/* return supported events on read */
58static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size)
59{
60 return PVPANIC_PANICKED;
61}
62
63static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val,
64 unsigned size)
65{
66 handle_event(val);
67}
68
69static const MemoryRegionOps pvpanic_ops = {
70 .read = pvpanic_ioport_read,
71 .write = pvpanic_ioport_write,
72 .impl = {
73 .min_access_size = 1,
74 .max_access_size = 1,
75 },
76};
77
78static void pvpanic_isa_initfn(Object *obj)
79{
80 PVPanicState *s = ISA_PVPANIC_DEVICE(obj);
81
82 memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1);
83}
84
85static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp)
86{
87 ISADevice *d = ISA_DEVICE(dev);
88 PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
89 FWCfgState *fw_cfg = fw_cfg_find();
90 uint16_t *pvpanic_port;
91
92 if (!fw_cfg) {
93 return;
94 }
95
96 pvpanic_port = g_malloc(sizeof(*pvpanic_port));
97 *pvpanic_port = cpu_to_le16(s->ioport);
98 fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port,
99 sizeof(*pvpanic_port));
100
101 isa_register_ioport(d, &s->io, s->ioport);
102}
103
104static Property pvpanic_isa_properties[] = {
105 DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505),
106 DEFINE_PROP_END_OF_LIST(),
107};
108
109static void pvpanic_isa_class_init(ObjectClass *klass, void *data)
110{
111 DeviceClass *dc = DEVICE_CLASS(klass);
112
113 dc->realize = pvpanic_isa_realizefn;
114 dc->props = pvpanic_isa_properties;
115 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
116}
117
118static TypeInfo pvpanic_isa_info = {
119 .name = TYPE_PVPANIC,
120 .parent = TYPE_ISA_DEVICE,
121 .instance_size = sizeof(PVPanicState),
122 .instance_init = pvpanic_isa_initfn,
123 .class_init = pvpanic_isa_class_init,
124};
125
126static void pvpanic_register_types(void)
127{
128 type_register_static(&pvpanic_isa_info);
129}
130
131type_init(pvpanic_register_types)
132