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 int xen_apic_set_base(APICCommonState *s, uint64_t val)
  53 {
  54     return 0;
  55 }
  56
  57 static void xen_apic_set_tpr(APICCommonState *s, uint8_t val)
  58 {
  59 }
  60
  61 static uint8_t xen_apic_get_tpr(APICCommonState *s)
  62 {
  63     return 0;
  64 }
  65
  66 static void xen_apic_vapic_base_update(APICCommonState *s)
  67 {
  68 }
  69
  70 static void xen_apic_external_nmi(APICCommonState *s)
  71 {
  72 }
  73
  74 static void xen_send_msi(MSIMessage *msi)
  75 {
  76     xen_hvm_inject_msi(msi->address, msi->data);
  77 }
  78
  79 static void xen_apic_class_init(ObjectClass *klass, void *data)
  80 {
  81     APICCommonClass *k = APIC_COMMON_CLASS(klass);
  82
  83     k->realize = xen_apic_realize;
  84     k->set_base = xen_apic_set_base;
  85     k->set_tpr = xen_apic_set_tpr;
  86     k->get_tpr = xen_apic_get_tpr;
  87     k->vapic_base_update = xen_apic_vapic_base_update;
  88     k->external_nmi = xen_apic_external_nmi;
  89     k->send_msi = xen_send_msi;
  90 }
  91
  92 static const TypeInfo xen_apic_info = {
  93     .name = "xen-apic",
  94     .parent = TYPE_APIC_COMMON,
  95     .instance_size = sizeof(APICCommonState),
  96     .class_init = xen_apic_class_init,
  97 };
  98
  99 static void xen_apic_register_types(void)
 100 {
 101     type_register_static(&xen_apic_info);
 102 }
 103
 104 type_init(xen_apic_register_types)