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