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