hw/core/nmi.c

   1 /*
   2  *  NMI monitor handler class and helpers.
   3  *
   4  *  Copyright IBM Corp., 2014
   5  *
   6  *  Author: Alexey Kardashevskiy <aik@ozlabs.ru>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License,
  11  *  or (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "qemu/osdep.h"
  23 #include "hw/nmi.h"
  24 #include "qapi/error.h"
  25 #include "qemu/module.h"
  26 #include "monitor/monitor.h"
  27
  28 struct do_nmi_s {
  29     int cpu_index;
  30     Error *err;
  31     bool handled;
  32 };
  33
  34 static void nmi_children(Object *o, struct do_nmi_s *ns);
  35
  36 static int do_nmi(Object *o, void *opaque)
  37 {
  38     struct do_nmi_s *ns = opaque;
  39     NMIState *n = (NMIState *) object_dynamic_cast(o, TYPE_NMI);
  40
  41     if (n) {
  42         NMIClass *nc = NMI_GET_CLASS(n);
  43
  44         ns->handled = true;
  45         nc->nmi_monitor_handler(n, ns->cpu_index, &ns->err);
  46         if (ns->err) {
  47             return -1;
  48         }
  49     }
  50     nmi_children(o, ns);
  51
  52     return 0;
  53 }
  54
  55 static void nmi_children(Object *o, struct do_nmi_s *ns)
  56 {
  57     object_child_foreach(o, do_nmi, ns);
  58 }
  59
  60 void nmi_monitor_handle(int cpu_index, Error **errp)
  61 {
  62     struct do_nmi_s ns = {
  63         .cpu_index = cpu_index,
  64         .err = NULL,
  65         .handled = false
  66     };
  67
  68     nmi_children(object_get_root(), &ns);
  69     if (ns.handled) {
  70         error_propagate(errp, ns.err);
  71     } else {
  72         error_setg(errp, "machine does not provide NMIs");
  73     }
  74 }
  75
  76 static const TypeInfo nmi_info = {
  77     .name          = TYPE_NMI,
  78     .parent        = TYPE_INTERFACE,
  79     .class_size    = sizeof(NMIClass),
  80 };
  81
  82 static void nmi_register_types(void)
  83 {
  84     type_register_static(&nmi_info);
  85 }
  86
  87 type_init(nmi_register_types)