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 static void handle_event(int event)
  26 {
  27     static bool logged;
  28
  29     if (event & ~(PVPANIC_PANICKED | PVPANIC_CRASHLOADED) && !logged) {
  30         qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event);
  31         logged = true;
  32     }
  33
  34     if (event & PVPANIC_PANICKED) {
  35         qemu_system_guest_panicked(NULL);
  36         return;
  37     }
  38
  39     if (event & PVPANIC_CRASHLOADED) {
  40         qemu_system_guest_crashloaded(NULL);
  41         return;
  42     }
  43 }
  44
  45 /* return supported events on read */
  46 static uint64_t pvpanic_read(void *opaque, hwaddr addr, unsigned size)
  47 {
  48     PVPanicState *pvp = opaque;
  49     return pvp->events;
  50 }
  51
  52 static void pvpanic_write(void *opaque, hwaddr addr, uint64_t val,
  53                                  unsigned size)
  54 {
  55     handle_event(val);
  56 }
  57
  58 static const MemoryRegionOps pvpanic_ops = {
  59     .read = pvpanic_read,
  60     .write = pvpanic_write,
  61     .impl = {
  62         .min_access_size = 1,
  63         .max_access_size = 1,
  64     },
  65 };
  66
  67 void pvpanic_setup_io(PVPanicState *s, DeviceState *dev, unsigned size)
  68 {
  69     memory_region_init_io(&s->mr, OBJECT(dev), &pvpanic_ops, s, "pvpanic", size);
  70 }