qemu/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 #include "hw/i386/apic_internal.h"
  13 #include "hw/pci/msi.h"
  14 #include "hw/xen/xen.h"
  15
  16 static uint64_t xen_apic_mem_read(void *opaque, hwaddr addr,
  17                                   unsigned size)
  18 {
  19     return ~(uint64_t)0;
  20 }
  21
  22 static void xen_apic_mem_write(void *opaque, hwaddr addr,
  23                                uint64_t data, unsigned size)
  24 {
  25     if (size != sizeof(uint32_t)) {
  26         fprintf(stderr, "Xen: APIC write data size = %d, invalid\n", size);
  27         return;
  28     }
  29
  30     xen_hvm_inject_msi(addr, data);
  31 }
  32
  33 static const MemoryRegionOps xen_apic_io_ops = {
  34     .read = xen_apic_mem_read,
  35     .write = xen_apic_mem_write,
  36     .endianness = DEVICE_NATIVE_ENDIAN,
  37 };
  38
  39 static void xen_apic_realize(DeviceState *dev, Error **errp)
  40 {
  41     APICCommonState *s = APIC_COMMON(dev);
  42
  43     s->vapic_control = 0;
  44     memory_region_init_io(&s->io_memory, OBJECT(s), &xen_apic_io_ops, s,
  45                           "xen-apic-msi", APIC_SPACE_SIZE);
  46
  47 #if defined(CONFIG_XEN_CTRL_INTERFACE_VERSION) \
  48     && CONFIG_XEN_CTRL_INTERFACE_VERSION >= 420
  49     msi_supported = true;
  50 #endif
  51 }
  52
  53 static void xen_apic_set_base(APICCommonState *s, uint64_t val)
  54 {
  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_apic_class_init(ObjectClass *klass, void *data)
  75 {
  76     APICCommonClass *k = APIC_COMMON_CLASS(klass);
  77
  78     k->realize = xen_apic_realize;
  79     k->set_base = xen_apic_set_base;
  80     k->set_tpr = xen_apic_set_tpr;
  81     k->get_tpr = xen_apic_get_tpr;
  82     k->vapic_base_update = xen_apic_vapic_base_update;
  83     k->external_nmi = xen_apic_external_nmi;
  84 }
  85
  86 static const TypeInfo xen_apic_info = {
  87     .name = "xen-apic",
  88     .parent = TYPE_APIC_COMMON,
  89     .instance_size = sizeof(APICCommonState),
  90     .class_init = xen_apic_class_init,
  91 };
  92
  93 static void xen_apic_register_types(void)
  94 {
  95     type_register_static(&xen_apic_info);
  96 }
  97
  98 type_init(xen_apic_register_types)