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 "qemu/osdep.h"
  13 #include "hw/i386/apic_internal.h"
  14 #include "hw/pci/msi.h"
  15 #include "hw/xen/xen.h"
  16
  17 static uint64_t xen_apic_mem_read(void *opaque, hwaddr addr,
  18                                   unsigned size)
  19 {
  20     return ~(uint64_t)0;
  21 }
  22
  23 static void xen_apic_mem_write(void *opaque, hwaddr addr,
  24                                uint64_t data, unsigned size)
  25 {
  26     if (size != sizeof(uint32_t)) {
  27         fprintf(stderr, "Xen: APIC write data size = %d, invalid\n", size);
  28         return;
  29     }
  30
  31     xen_hvm_inject_msi(addr, data);
  32 }
  33
  34 static const MemoryRegionOps xen_apic_io_ops = {
  35     .read = xen_apic_mem_read,
  36     .write = xen_apic_mem_write,
  37     .endianness = DEVICE_NATIVE_ENDIAN,
  38 };
  39
  40 static void xen_apic_realize(DeviceState *dev, Error **errp)
  41 {
  42     APICCommonState *s = APIC_COMMON(dev);
  43
  44     s->vapic_control = 0;
  45     memory_region_init_io(&s->io_memory, OBJECT(s), &xen_apic_io_ops, s,
  46                           "xen-apic-msi", APIC_SPACE_SIZE);
  47
  48 #if defined(CONFIG_XEN_CTRL_INTERFACE_VERSION) \
  49     && CONFIG_XEN_CTRL_INTERFACE_VERSION >= 420
  50     msi_supported = true;
  51 #endif
  52 }
  53
  54 static void xen_apic_set_base(APICCommonState *s, uint64_t val)
  55 {
  56 }
  57
  58 static void xen_apic_set_tpr(APICCommonState *s, uint8_t val)
  59 {
  60 }
  61
  62 static uint8_t xen_apic_get_tpr(APICCommonState *s)
  63 {
  64     return 0;
  65 }
  66
  67 static void xen_apic_vapic_base_update(APICCommonState *s)
  68 {
  69 }
  70
  71 static void xen_apic_external_nmi(APICCommonState *s)
  72 {
  73 }
  74
  75 static void xen_apic_class_init(ObjectClass *klass, void *data)
  76 {
  77     APICCommonClass *k = APIC_COMMON_CLASS(klass);
  78
  79     k->realize = xen_apic_realize;
  80     k->set_base = xen_apic_set_base;
  81     k->set_tpr = xen_apic_set_tpr;
  82     k->get_tpr = xen_apic_get_tpr;
  83     k->vapic_base_update = xen_apic_vapic_base_update;
  84     k->external_nmi = xen_apic_external_nmi;
  85 }
  86
  87 static const TypeInfo xen_apic_info = {
  88     .name = "xen-apic",
  89     .parent = TYPE_APIC_COMMON,
  90     .instance_size = sizeof(APICCommonState),
  91     .class_init = xen_apic_class_init,
  92 };
  93
  94 static void xen_apic_register_types(void)
  95 {
  96     type_register_static(&xen_apic_info);
  97 }
  98
  99 type_init(xen_apic_register_types)