xref: /openbmc/qemu/hw/misc/pvpanic.c (revision af206c28)
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 #include "qom/object.h"
24 #include "standard-headers/misc/pvpanic.h"
25 
26 static void handle_event(int event)
27 {
28     static bool logged;
29 
30     if (event & ~(PVPANIC_PANICKED | PVPANIC_CRASH_LOADED) && !logged) {
31         qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event);
32         logged = true;
33     }
34 
35     if (event & PVPANIC_PANICKED) {
36         qemu_system_guest_panicked(NULL);
37         return;
38     }
39 
40     if (event & PVPANIC_CRASH_LOADED) {
41         qemu_system_guest_crashloaded(NULL);
42         return;
43     }
44 }
45 
46 /* return supported events on read */
47 static uint64_t pvpanic_read(void *opaque, hwaddr addr, unsigned size)
48 {
49     PVPanicState *pvp = opaque;
50     return pvp->events;
51 }
52 
53 static void pvpanic_write(void *opaque, hwaddr addr, uint64_t val,
54                                  unsigned size)
55 {
56     handle_event(val);
57 }
58 
59 static const MemoryRegionOps pvpanic_ops = {
60     .read = pvpanic_read,
61     .write = pvpanic_write,
62     .impl = {
63         .min_access_size = 1,
64         .max_access_size = 1,
65     },
66 };
67 
68 void pvpanic_setup_io(PVPanicState *s, DeviceState *dev, unsigned size)
69 {
70     memory_region_init_io(&s->mr, OBJECT(dev), &pvpanic_ops, s, "pvpanic", size);
71 }
72