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