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 "hw/nmi.h"
  23 #include "qapi/qmp/qerror.h"
  24 #include "monitor/monitor.h"
  25
  26 struct do_nmi_s {
  27     int cpu_index;
  28     Error *errp;
  29     bool handled;
  30 };
  31
  32 static void nmi_children(Object *o, struct do_nmi_s *ns);
  33
  34 static int do_nmi(Object *o, void *opaque)
  35 {
  36     struct do_nmi_s *ns = opaque;
  37     NMIState *n = (NMIState *) object_dynamic_cast(o, TYPE_NMI);
  38
  39     if (n) {
  40         NMIClass *nc = NMI_GET_CLASS(n);
  41
  42         ns->handled = true;
  43         nc->nmi_monitor_handler(n, ns->cpu_index, &ns->errp);
  44         if (ns->errp) {
  45             return -1;
  46         }
  47     }
  48     nmi_children(o, ns);
  49
  50     return 0;
  51 }
  52
  53 static void nmi_children(Object *o, struct do_nmi_s *ns)
  54 {
  55     object_child_foreach(o, do_nmi, ns);
  56 }
  57
  58 void nmi_monitor_handle(int cpu_index, Error **errp)
  59 {
  60     struct do_nmi_s ns = {
  61         .cpu_index = cpu_index,
  62         .errp = NULL,
  63         .handled = false
  64     };
  65
  66     nmi_children(object_get_root(), &ns);
  67     if (ns.handled) {
  68         error_propagate(errp, ns.errp);
  69     } else {
  70         error_setg(errp, QERR_UNSUPPORTED);
  71     }
  72 }
  73
  74 void inject_nmi(void)
  75 {
  76 #if defined(TARGET_I386)
  77     CPUState *cs;
  78
  79     CPU_FOREACH(cs) {
  80         X86CPU *cpu = X86_CPU(cs);
  81
  82         if (!cpu->apic_state) {
  83             cpu_interrupt(cs, CPU_INTERRUPT_NMI);
  84         } else {
  85             apic_deliver_nmi(cpu->apic_state);
  86         }
  87     }
  88 #else
  89     nmi_monitor_handle(0, NULL);
  90 #endif
  91 }
  92
  93 static const TypeInfo nmi_info = {
  94     .name          = TYPE_NMI,
  95     .parent        = TYPE_INTERFACE,
  96     .class_size    = sizeof(NMIClass),
  97 };
  98
  99 static void nmi_register_types(void)
 100 {
 101     type_register_static(&nmi_info);
 102 }
 103
 104 type_init(nmi_register_types)