hw/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/apic_internal.h"
  13 #include "hw/pci/msi.h"
  14 #include "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_init(APICCommonState *s)
  40 {
  41     memory_region_init_io(&s->io_memory, &xen_apic_io_ops, s, "xen-apic-msi",
  42                           MSI_SPACE_SIZE);
  43
  44 #if defined(CONFIG_XEN_CTRL_INTERFACE_VERSION) \
  45     && CONFIG_XEN_CTRL_INTERFACE_VERSION >= 420
  46     msi_supported = true;
  47 #endif
  48 }
  49
  50 static void xen_apic_set_base(APICCommonState *s, uint64_t val)
  51 {
  52 }
  53
  54 static void xen_apic_set_tpr(APICCommonState *s, uint8_t val)
  55 {
  56 }
  57
  58 static uint8_t xen_apic_get_tpr(APICCommonState *s)
  59 {
  60     return 0;
  61 }
  62
  63 static void xen_apic_vapic_base_update(APICCommonState *s)
  64 {
  65 }
  66
  67 static void xen_apic_external_nmi(APICCommonState *s)
  68 {
  69 }
  70
  71 static void xen_apic_class_init(ObjectClass *klass, void *data)
  72 {
  73     APICCommonClass *k = APIC_COMMON_CLASS(klass);
  74
  75     k->init = xen_apic_init;
  76     k->set_base = xen_apic_set_base;
  77     k->set_tpr = xen_apic_set_tpr;
  78     k->get_tpr = xen_apic_get_tpr;
  79     k->vapic_base_update = xen_apic_vapic_base_update;
  80     k->external_nmi = xen_apic_external_nmi;
  81 }
  82
  83 static TypeInfo xen_apic_info = {
  84     .name = "xen-apic",
  85     .parent = TYPE_APIC_COMMON,
  86     .instance_size = sizeof(APICCommonState),
  87     .class_init = xen_apic_class_init,
  88 };
  89
  90 static void xen_apic_register_types(void)
  91 {
  92     type_register_static(&xen_apic_info);
  93 }
  94
  95 type_init(xen_apic_register_types)