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 "sysemu/sysemu.h"
  17 #include "qemu/log.h"
  18
  19 #include "hw/nvram/fw_cfg.h"
  20 #include "hw/misc/pvpanic.h"
  21
  22 /* The bit of supported pv event */
  23 #define PVPANIC_F_PANICKED      0
  24
  25 /* The pv event value */
  26 #define PVPANIC_PANICKED        (1 << PVPANIC_F_PANICKED)
  27
  28 #define ISA_PVPANIC_DEVICE(obj)    \
  29     OBJECT_CHECK(PVPanicState, (obj), TYPE_PVPANIC)
  30
  31 static void handle_event(int event)
  32 {
  33     static bool logged;
  34
  35     if (event & ~PVPANIC_PANICKED && !logged) {
  36         qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event);
  37         logged = true;
  38     }
  39
  40     if (event & PVPANIC_PANICKED) {
  41         qemu_system_guest_panicked(NULL);
  42         return;
  43     }
  44 }
  45
  46 #include "hw/isa/isa.h"
  47
  48 typedef struct PVPanicState {
  49     ISADevice parent_obj;
  50
  51     MemoryRegion io;
  52     uint16_t ioport;
  53 } PVPanicState;
  54
  55 /* return supported events on read */
  56 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size)
  57 {
  58     return PVPANIC_PANICKED;
  59 }
  60
  61 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val,
  62                                  unsigned size)
  63 {
  64     handle_event(val);
  65 }
  66
  67 static const MemoryRegionOps pvpanic_ops = {
  68     .read = pvpanic_ioport_read,
  69     .write = pvpanic_ioport_write,
  70     .impl = {
  71         .min_access_size = 1,
  72         .max_access_size = 1,
  73     },
  74 };
  75
  76 static void pvpanic_isa_initfn(Object *obj)
  77 {
  78     PVPanicState *s = ISA_PVPANIC_DEVICE(obj);
  79
  80     memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1);
  81 }
  82
  83 static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp)
  84 {
  85     ISADevice *d = ISA_DEVICE(dev);
  86     PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
  87     FWCfgState *fw_cfg = fw_cfg_find();
  88     uint16_t *pvpanic_port;
  89
  90     if (!fw_cfg) {
  91         return;
  92     }
  93
  94     pvpanic_port = g_malloc(sizeof(*pvpanic_port));
  95     *pvpanic_port = cpu_to_le16(s->ioport);
  96     fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port,
  97                     sizeof(*pvpanic_port));
  98
  99     isa_register_ioport(d, &s->io, s->ioport);
 100 }
 101
 102 #define PVPANIC_IOPORT_PROP "ioport"
 103
 104 uint16_t pvpanic_port(void)
 105 {
 106     Object *o = object_resolve_path_type("", TYPE_PVPANIC, NULL);
 107     if (!o) {
 108         return 0;
 109     }
 110     return object_property_get_uint(o, PVPANIC_IOPORT_PROP, NULL);
 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     dc->props = 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)