xref: /qemu/hw/misc/pvpanic.c (revision 7b0f97ba) 
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 "sysemu/sysemu.h"
17 #include "qemu/log.h"
18 
19 #include "hw/nvram/fw_cfg.h"
20 #include "hw/misc/pvpanic.h"
21 
22 /* The bit of supported pv event */
23 #define PVPANIC_F_PANICKED      0
24 
25 /* The pv event value */
26 #define PVPANIC_PANICKED        (1 << PVPANIC_F_PANICKED)
27 
28 #define ISA_PVPANIC_DEVICE(obj)    \
29     OBJECT_CHECK(PVPanicState, (obj), TYPE_PVPANIC)
30 
31 static void handle_event(int event)
32 {
33     static bool logged;
34 
35     if (event & ~PVPANIC_PANICKED && !logged) {
36         qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event);
37         logged = true;
38     }
39 
40     if (event & PVPANIC_PANICKED) {
41         qemu_system_guest_panicked(NULL);
42         return;
43     }
44 }
45 
46 #include "hw/isa/isa.h"
47 
48 typedef struct PVPanicState {
49     ISADevice parent_obj;
50 
51     MemoryRegion io;
52     uint16_t ioport;
53 } PVPanicState;
54 
55 /* return supported events on read */
56 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size)
57 {
58     return PVPANIC_PANICKED;
59 }
60 
61 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val,
62                                  unsigned size)
63 {
64     handle_event(val);
65 }
66 
67 static const MemoryRegionOps pvpanic_ops = {
68     .read = pvpanic_ioport_read,
69     .write = pvpanic_ioport_write,
70     .impl = {
71         .min_access_size = 1,
72         .max_access_size = 1,
73     },
74 };
75 
76 static void pvpanic_isa_initfn(Object *obj)
77 {
78     PVPanicState *s = ISA_PVPANIC_DEVICE(obj);
79 
80     memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1);
81 }
82 
83 static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp)
84 {
85     ISADevice *d = ISA_DEVICE(dev);
86     PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
87     FWCfgState *fw_cfg = fw_cfg_find();
88     uint16_t *pvpanic_port;
89 
90     if (!fw_cfg) {
91         return;
92     }
93 
94     pvpanic_port = g_malloc(sizeof(*pvpanic_port));
95     *pvpanic_port = cpu_to_le16(s->ioport);
96     fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port,
97                     sizeof(*pvpanic_port));
98 
99     isa_register_ioport(d, &s->io, s->ioport);
100 }
101 
102 static Property pvpanic_isa_properties[] = {
103     DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505),
104     DEFINE_PROP_END_OF_LIST(),
105 };
106 
107 static void pvpanic_isa_class_init(ObjectClass *klass, void *data)
108 {
109     DeviceClass *dc = DEVICE_CLASS(klass);
110 
111     dc->realize = pvpanic_isa_realizefn;
112     dc->props = pvpanic_isa_properties;
113     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
114 }
115 
116 static TypeInfo pvpanic_isa_info = {
117     .name          = TYPE_PVPANIC,
118     .parent        = TYPE_ISA_DEVICE,
119     .instance_size = sizeof(PVPanicState),
120     .instance_init = pvpanic_isa_initfn,
121     .class_init    = pvpanic_isa_class_init,
122 };
123 
124 static void pvpanic_register_types(void)
125 {
126     type_register_static(&pvpanic_isa_info);
127 }
128 
129 type_init(pvpanic_register_types)
130