hw/intc/ioapic_common.c

   1 /*
   2  *  IOAPIC emulation logic - common bits of emulated and KVM kernel model
   3  *
   4  *  Copyright (c) 2004-2005 Fabrice Bellard
   5  *  Copyright (c) 2009      Xiantao Zhang, Intel
   6  *  Copyright (c) 2011      Jan Kiszka, Siemens AG
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library 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 GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "hw/i386/ioapic.h"
  23 #include "hw/i386/ioapic_internal.h"
  24 #include "hw/sysbus.h"
  25
  26 /* ioapic_no count start from 0 to MAX_IOAPICS,
  27  * remove as static variable from ioapic_common_init.
  28  * now as a global variable, let child to increase the counter
  29  * then we can drop the 'instance_no' argument
  30  * and convert to our QOM's realize function
  31  */
  32 int ioapic_no;
  33
  34 void ioapic_reset_common(DeviceState *dev)
  35 {
  36     IOAPICCommonState *s = IOAPIC_COMMON(dev);
  37     int i;
  38
  39     s->id = 0;
  40     s->ioregsel = 0;
  41     s->irr = 0;
  42     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
  43         s->ioredtbl[i] = 1 << IOAPIC_LVT_MASKED_SHIFT;
  44     }
  45 }
  46
  47 static void ioapic_dispatch_pre_save(void *opaque)
  48 {
  49     IOAPICCommonState *s = IOAPIC_COMMON(opaque);
  50     IOAPICCommonClass *info = IOAPIC_COMMON_GET_CLASS(s);
  51
  52     if (info->pre_save) {
  53         info->pre_save(s);
  54     }
  55 }
  56
  57 static int ioapic_dispatch_post_load(void *opaque, int version_id)
  58 {
  59     IOAPICCommonState *s = IOAPIC_COMMON(opaque);
  60     IOAPICCommonClass *info = IOAPIC_COMMON_GET_CLASS(s);
  61
  62     if (info->post_load) {
  63         info->post_load(s);
  64     }
  65     return 0;
  66 }
  67
  68 static void ioapic_common_realize(DeviceState *dev, Error **errp)
  69 {
  70     IOAPICCommonState *s = IOAPIC_COMMON(dev);
  71     IOAPICCommonClass *info;
  72
  73     if (ioapic_no >= MAX_IOAPICS) {
  74         error_setg(errp, "Only %d ioapics allowed", MAX_IOAPICS);
  75         return;
  76     }
  77
  78     info = IOAPIC_COMMON_GET_CLASS(s);
  79     info->realize(dev, errp);
  80
  81     sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->io_memory);
  82     ioapic_no++;
  83 }
  84
  85 static const VMStateDescription vmstate_ioapic_common = {
  86     .name = "ioapic",
  87     .version_id = 3,
  88     .minimum_version_id = 1,
  89     .pre_save = ioapic_dispatch_pre_save,
  90     .post_load = ioapic_dispatch_post_load,
  91     .fields = (VMStateField[]) {
  92         VMSTATE_UINT8(id, IOAPICCommonState),
  93         VMSTATE_UINT8(ioregsel, IOAPICCommonState),
  94         VMSTATE_UNUSED_V(2, 8), /* to account for qemu-kvm's v2 format */
  95         VMSTATE_UINT32_V(irr, IOAPICCommonState, 2),
  96         VMSTATE_UINT64_ARRAY(ioredtbl, IOAPICCommonState, IOAPIC_NUM_PINS),
  97         VMSTATE_END_OF_LIST()
  98     }
  99 };
 100
 101 static void ioapic_common_class_init(ObjectClass *klass, void *data)
 102 {
 103     DeviceClass *dc = DEVICE_CLASS(klass);
 104
 105     dc->realize = ioapic_common_realize;
 106     dc->vmsd = &vmstate_ioapic_common;
 107 }
 108
 109 static const TypeInfo ioapic_common_type = {
 110     .name = TYPE_IOAPIC_COMMON,
 111     .parent = TYPE_SYS_BUS_DEVICE,
 112     .instance_size = sizeof(IOAPICCommonState),
 113     .class_size = sizeof(IOAPICCommonClass),
 114     .class_init = ioapic_common_class_init,
 115     .abstract = true,
 116 };
 117
 118 static void ioapic_common_register_types(void)
 119 {
 120     type_register_static(&ioapic_common_type);
 121 }
 122
 123 type_init(ioapic_common_register_types)