hw/core/reset.c

   1 /*
   2  *  Reset handlers.
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2016 Red Hat, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "qemu/queue.h"
  28 #include "sysemu/reset.h"
  29
  30 /* reset/shutdown handler */
  31
  32 typedef struct QEMUResetEntry {
  33     QTAILQ_ENTRY(QEMUResetEntry) entry;
  34     QEMUResetHandler *func;
  35     void *opaque;
  36 } QEMUResetEntry;
  37
  38 static QTAILQ_HEAD(reset_handlers, QEMUResetEntry) reset_handlers =
  39     QTAILQ_HEAD_INITIALIZER(reset_handlers);
  40
  41 void qemu_register_reset(QEMUResetHandler *func, void *opaque)
  42 {
  43     QEMUResetEntry *re = g_malloc0(sizeof(QEMUResetEntry));
  44
  45     re->func = func;
  46     re->opaque = opaque;
  47     QTAILQ_INSERT_TAIL(&reset_handlers, re, entry);
  48 }
  49
  50 void qemu_unregister_reset(QEMUResetHandler *func, void *opaque)
  51 {
  52     QEMUResetEntry *re;
  53
  54     QTAILQ_FOREACH(re, &reset_handlers, entry) {
  55         if (re->func == func && re->opaque == opaque) {
  56             QTAILQ_REMOVE(&reset_handlers, re, entry);
  57             g_free(re);
  58             return;
  59         }
  60     }
  61 }
  62
  63 void qemu_devices_reset(void)
  64 {
  65     QEMUResetEntry *re, *nre;
  66
  67     /* reset all devices */
  68     QTAILQ_FOREACH_SAFE(re, &reset_handlers, entry, nre) {
  69         re->func(re->opaque);
  70     }
  71 }
  72