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 #include "standard-headers/linux/pvpanic.h"
  25
  26 static void handle_event(int event)
  27 {
  28     static bool logged;
  29
  30     if (event & ~(PVPANIC_PANICKED | PVPANIC_CRASH_LOADED) && !logged) {
  31         qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event);
  32         logged = true;
  33     }
  34
  35     if (event & PVPANIC_PANICKED) {
  36         qemu_system_guest_panicked(NULL);
  37         return;
  38     }
  39
  40     if (event & PVPANIC_CRASH_LOADED) {
  41         qemu_system_guest_crashloaded(NULL);
  42         return;
  43     }
  44 }
  45
  46 /* return supported events on read */
  47 static uint64_t pvpanic_read(void *opaque, hwaddr addr, unsigned size)
  48 {
  49     PVPanicState *pvp = opaque;
  50     return pvp->events;
  51 }
  52
  53 static void pvpanic_write(void *opaque, hwaddr addr, uint64_t val,
  54                                  unsigned size)
  55 {
  56     handle_event(val);
  57 }
  58
  59 static const MemoryRegionOps pvpanic_ops = {
  60     .read = pvpanic_read,
  61     .write = pvpanic_write,
  62     .impl = {
  63         .min_access_size = 1,
  64         .max_access_size = 1,
  65     },
  66 };
  67
  68 void pvpanic_setup_io(PVPanicState *s, DeviceState *dev, unsigned size)
  69 {
  70     memory_region_init_io(&s->mr, OBJECT(dev), &pvpanic_ops, s, "pvpanic", size);
  71 }