hw/misc/pvpanic.c

   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 "qapi/qmp/qobject.h"
  17 #include "qapi/qmp/qjson.h"
  18 #include "sysemu/sysemu.h"
  19 #include "qemu/log.h"
  20
  21 #include "hw/nvram/fw_cfg.h"
  22 #include "hw/i386/pc.h"
  23 #include "qapi-event.h"
  24
  25 /* The bit of supported pv event */
  26 #define PVPANIC_F_PANICKED      0
  27
  28 /* The pv event value */
  29 #define PVPANIC_PANICKED        (1 << PVPANIC_F_PANICKED)
  30
  31 #define TYPE_ISA_PVPANIC_DEVICE    "pvpanic"
  32 #define ISA_PVPANIC_DEVICE(obj)    \
  33     OBJECT_CHECK(PVPanicState, (obj), TYPE_ISA_PVPANIC_DEVICE)
  34
  35 static void handle_event(int event)
  36 {
  37     static bool logged;
  38
  39     if (event & ~PVPANIC_PANICKED && !logged) {
  40         qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event);
  41         logged = true;
  42     }
  43
  44     if (event & PVPANIC_PANICKED) {
  45         qemu_system_guest_panicked();
  46         return;
  47     }
  48 }
  49
  50 #include "hw/isa/isa.h"
  51
  52 typedef struct PVPanicState {
  53     ISADevice parent_obj;
  54
  55     MemoryRegion io;
  56     uint16_t ioport;
  57 } PVPanicState;
  58
  59 /* return supported events on read */
  60 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size)
  61 {
  62     return PVPANIC_PANICKED;
  63 }
  64
  65 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val,
  66                                  unsigned size)
  67 {
  68     handle_event(val);
  69 }
  70
  71 static const MemoryRegionOps pvpanic_ops = {
  72     .read = pvpanic_ioport_read,
  73     .write = pvpanic_ioport_write,
  74     .impl = {
  75         .min_access_size = 1,
  76         .max_access_size = 1,
  77     },
  78 };
  79
  80 static void pvpanic_isa_initfn(Object *obj)
  81 {
  82     PVPanicState *s = ISA_PVPANIC_DEVICE(obj);
  83
  84     memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1);
  85 }
  86
  87 static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp)
  88 {
  89     ISADevice *d = ISA_DEVICE(dev);
  90     PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
  91     FWCfgState *fw_cfg = fw_cfg_find();
  92     uint16_t *pvpanic_port;
  93
  94     if (!fw_cfg) {
  95         return;
  96     }
  97
  98     pvpanic_port = g_malloc(sizeof(*pvpanic_port));
  99     *pvpanic_port = cpu_to_le16(s->ioport);
 100     fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port,
 101                     sizeof(*pvpanic_port));
 102
 103     isa_register_ioport(d, &s->io, s->ioport);
 104 }
 105
 106 #define PVPANIC_IOPORT_PROP "ioport"
 107
 108 uint16_t pvpanic_port(void)
 109 {
 110     Object *o = object_resolve_path_type("", TYPE_ISA_PVPANIC_DEVICE, NULL);
 111     if (!o) {
 112         return 0;
 113     }
 114     return object_property_get_int(o, PVPANIC_IOPORT_PROP, NULL);
 115 }
 116
 117 static Property pvpanic_isa_properties[] = {
 118     DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505),
 119     DEFINE_PROP_END_OF_LIST(),
 120 };
 121
 122 static void pvpanic_isa_class_init(ObjectClass *klass, void *data)
 123 {
 124     DeviceClass *dc = DEVICE_CLASS(klass);
 125
 126     dc->realize = pvpanic_isa_realizefn;
 127     dc->props = pvpanic_isa_properties;
 128     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 129 }
 130
 131 static TypeInfo pvpanic_isa_info = {
 132     .name          = TYPE_ISA_PVPANIC_DEVICE,
 133     .parent        = TYPE_ISA_DEVICE,
 134     .instance_size = sizeof(PVPanicState),
 135     .instance_init = pvpanic_isa_initfn,
 136     .class_init    = pvpanic_isa_class_init,
 137 };
 138
 139 static void pvpanic_register_types(void)
 140 {
 141     type_register_static(&pvpanic_isa_info);
 142 }
 143
 144 type_init(pvpanic_register_types)