xref: /openbmc/qemu/hw/misc/pvpanic.c (revision 59a3a1c0) 
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 
33 static 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 
50 typedef struct PVPanicState {
51     ISADevice parent_obj;
52 
53     MemoryRegion io;
54     uint16_t ioport;
55 } PVPanicState;
56 
57 /* return supported events on read */
58 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size)
59 {
60     return PVPANIC_PANICKED;
61 }
62 
63 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val,
64                                  unsigned size)
65 {
66     handle_event(val);
67 }
68 
69 static 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 
78 static 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 
85 static 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 
104 static Property pvpanic_isa_properties[] = {
105     DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505),
106     DEFINE_PROP_END_OF_LIST(),
107 };
108 
109 static 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 
118 static 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 
126 static void pvpanic_register_types(void)
127 {
128     type_register_static(&pvpanic_isa_info);
129 }
130 
131 type_init(pvpanic_register_types)
132