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 memory_region_init_io(&s->io_memory, OBJECT(s), &xen_apic_io_ops, s, 44 "xen-apic-msi", APIC_SPACE_SIZE); 45 46 #if defined(CONFIG_XEN_CTRL_INTERFACE_VERSION) \ 47 && CONFIG_XEN_CTRL_INTERFACE_VERSION >= 420 48 msi_supported = true; 49 #endif 50 } 51 52 static void xen_apic_set_base(APICCommonState *s, uint64_t val) 53 { 54 } 55 56 static void xen_apic_set_tpr(APICCommonState *s, uint8_t val) 57 { 58 } 59 60 static uint8_t xen_apic_get_tpr(APICCommonState *s) 61 { 62 return 0; 63 } 64 65 static void xen_apic_vapic_base_update(APICCommonState *s) 66 { 67 } 68 69 static void xen_apic_external_nmi(APICCommonState *s) 70 { 71 } 72 73 static void xen_apic_class_init(ObjectClass *klass, void *data) 74 { 75 APICCommonClass *k = APIC_COMMON_CLASS(klass); 76 77 k->realize = xen_apic_realize; 78 k->set_base = xen_apic_set_base; 79 k->set_tpr = xen_apic_set_tpr; 80 k->get_tpr = xen_apic_get_tpr; 81 k->vapic_base_update = xen_apic_vapic_base_update; 82 k->external_nmi = xen_apic_external_nmi; 83 } 84 85 static const TypeInfo xen_apic_info = { 86 .name = "xen-apic", 87 .parent = TYPE_APIC_COMMON, 88 .instance_size = sizeof(APICCommonState), 89 .class_init = xen_apic_class_init, 90 }; 91 92 static void xen_apic_register_types(void) 93 { 94 type_register_static(&xen_apic_info); 95 } 96 97 type_init(xen_apic_register_types) 98