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