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 "qom/cpu.h"
  24 #include "hw/nmi.h"
  25 #include "qapi/error.h"
  26 #include "qapi/qmp/qerror.h"
  27 #include "monitor/monitor.h"
  28
  29 #if defined(TARGET_I386)
  30 #include "cpu.h"
  31 #endif
  32
  33 struct do_nmi_s {
  34     int cpu_index;
  35     Error *err;
  36     bool handled;
  37 };
  38
  39 static void nmi_children(Object *o, struct do_nmi_s *ns);
  40
  41 static int do_nmi(Object *o, void *opaque)
  42 {
  43     struct do_nmi_s *ns = opaque;
  44     NMIState *n = (NMIState *) object_dynamic_cast(o, TYPE_NMI);
  45
  46     if (n) {
  47         NMIClass *nc = NMI_GET_CLASS(n);
  48
  49         ns->handled = true;
  50         nc->nmi_monitor_handler(n, ns->cpu_index, &ns->err);
  51         if (ns->err) {
  52             return -1;
  53         }
  54     }
  55     nmi_children(o, ns);
  56
  57     return 0;
  58 }
  59
  60 static void nmi_children(Object *o, struct do_nmi_s *ns)
  61 {
  62     object_child_foreach(o, do_nmi, ns);
  63 }
  64
  65 void nmi_monitor_handle(int cpu_index, Error **errp)
  66 {
  67     struct do_nmi_s ns = {
  68         .cpu_index = cpu_index,
  69         .err = NULL,
  70         .handled = false
  71     };
  72
  73     nmi_children(object_get_root(), &ns);
  74     if (ns.handled) {
  75         error_propagate(errp, ns.err);
  76     } else {
  77         error_setg(errp, QERR_UNSUPPORTED);
  78     }
  79 }
  80
  81 void inject_nmi(void)
  82 {
  83 #if defined(TARGET_I386)
  84     CPUState *cs;
  85
  86     CPU_FOREACH(cs) {
  87         X86CPU *cpu = X86_CPU(cs);
  88
  89         if (!cpu->apic_state) {
  90             cpu_interrupt(cs, CPU_INTERRUPT_NMI);
  91         } else {
  92             apic_deliver_nmi(cpu->apic_state);
  93         }
  94     }
  95 #else
  96     nmi_monitor_handle(0, NULL);
  97 #endif
  98 }
  99
 100 static const TypeInfo nmi_info = {
 101     .name          = TYPE_NMI,
 102     .parent        = TYPE_INTERFACE,
 103     .class_size    = sizeof(NMIClass),
 104 };
 105
 106 static void nmi_register_types(void)
 107 {
 108     type_register_static(&nmi_info);
 109 }
 110
 111 type_init(nmi_register_types)