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