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