hw/i386/xen/xen_apic.c

   1 /*
   2  * Xen basic APIC support
   3  *
   4  * Copyright (c) 2012 Citrix
   5  *
   6  * Authors:
   7  *  Wei Liu <wei.liu2@citrix.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL version 2 or
  10  * later. See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "hw/i386/apic_internal.h"
  15 #include "hw/pci/msi.h"
  16 #include "hw/xen/xen.h"
  17 #include "qemu/module.h"
  18
  19 static uint64_t xen_apic_mem_read(void *opaque, hwaddr addr,
  20                                   unsigned size)
  21 {
  22     return ~(uint64_t)0;
  23 }
  24
  25 static void xen_apic_mem_write(void *opaque, hwaddr addr,
  26                                uint64_t data, unsigned size)
  27 {
  28     if (size != sizeof(uint32_t)) {
  29         fprintf(stderr, "Xen: APIC write data size = %d, invalid\n", size);
  30         return;
  31     }
  32
  33     xen_hvm_inject_msi(addr, data);
  34 }
  35
  36 static const MemoryRegionOps xen_apic_io_ops = {
  37     .read = xen_apic_mem_read,
  38     .write = xen_apic_mem_write,
  39     .endianness = DEVICE_NATIVE_ENDIAN,
  40 };
  41
  42 static void xen_apic_realize(DeviceState *dev, Error **errp)
  43 {
  44     APICCommonState *s = APIC_COMMON(dev);
  45
  46     s->vapic_control = 0;
  47     memory_region_init_io(&s->io_memory, OBJECT(s), &xen_apic_io_ops, s,
  48                           "xen-apic-msi", APIC_SPACE_SIZE);
  49     msi_nonbroken = true;
  50 }
  51
  52 static void xen_apic_set_base(APICCommonState *s, uint64_t val)
  53 {
  54 }
  55
  56 static void xen_apic_set_tpr(APICCommonState *s, uint8_t val)
  57 {
  58 }
  59
  60 static uint8_t xen_apic_get_tpr(APICCommonState *s)
  61 {
  62     return 0;
  63 }
  64
  65 static void xen_apic_vapic_base_update(APICCommonState *s)
  66 {
  67 }
  68
  69 static void xen_apic_external_nmi(APICCommonState *s)
  70 {
  71 }
  72
  73 static void xen_send_msi(MSIMessage *msi)
  74 {
  75     xen_hvm_inject_msi(msi->address, msi->data);
  76 }
  77
  78 static void xen_apic_class_init(ObjectClass *klass, void *data)
  79 {
  80     APICCommonClass *k = APIC_COMMON_CLASS(klass);
  81
  82     k->realize = xen_apic_realize;
  83     k->set_base = xen_apic_set_base;
  84     k->set_tpr = xen_apic_set_tpr;
  85     k->get_tpr = xen_apic_get_tpr;
  86     k->vapic_base_update = xen_apic_vapic_base_update;
  87     k->external_nmi = xen_apic_external_nmi;
  88     k->send_msi = xen_send_msi;
  89 }
  90
  91 static const TypeInfo xen_apic_info = {
  92     .name = "xen-apic",
  93     .parent = TYPE_APIC_COMMON,
  94     .instance_size = sizeof(APICCommonState),
  95     .class_init = xen_apic_class_init,
  96 };
  97
  98 static void xen_apic_register_types(void)
  99 {
 100     type_register_static(&xen_apic_info);
 101 }
 102
 103 type_init(xen_apic_register_types)