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/msi.h"
  14 #include "xen.h"
  15
  16 static uint64_t xen_apic_mem_read(void *opaque, target_phys_addr_t addr,
  17                                   unsigned size)
  18 {
  19     return ~(uint64_t)0;
  20 }
  21
  22 static void xen_apic_mem_write(void *opaque, target_phys_addr_t 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
  45 static void xen_apic_set_base(APICCommonState *s, uint64_t val)
  46 {
  47 }
  48
  49 static void xen_apic_set_tpr(APICCommonState *s, uint8_t val)
  50 {
  51 }
  52
  53 static uint8_t xen_apic_get_tpr(APICCommonState *s)
  54 {
  55     return 0;
  56 }
  57
  58 static void xen_apic_vapic_base_update(APICCommonState *s)
  59 {
  60 }
  61
  62 static void xen_apic_external_nmi(APICCommonState *s)
  63 {
  64 }
  65
  66 static void xen_apic_class_init(ObjectClass *klass, void *data)
  67 {
  68     APICCommonClass *k = APIC_COMMON_CLASS(klass);
  69
  70     k->init = xen_apic_init;
  71     k->set_base = xen_apic_set_base;
  72     k->set_tpr = xen_apic_set_tpr;
  73     k->get_tpr = xen_apic_get_tpr;
  74     k->vapic_base_update = xen_apic_vapic_base_update;
  75     k->external_nmi = xen_apic_external_nmi;
  76 }
  77
  78 static TypeInfo xen_apic_info = {
  79     .name = "xen-apic",
  80     .parent = TYPE_APIC_COMMON,
  81     .instance_size = sizeof(APICCommonState),
  82     .class_init = xen_apic_class_init,
  83 };
  84
  85 static void xen_apic_register_types(void)
  86 {
  87     type_register_static(&xen_apic_info);
  88 }
  89
  90 type_init(xen_apic_register_types)