xref: /openbmc/qemu/hw/i386/xen/xen_apic.c (revision d2dfe0b5)
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 
13 #include "qemu/osdep.h"
14 #include "hw/i386/apic_internal.h"
15 #include "hw/pci/msi.h"
16 #include "hw/xen/xen.h"
17 #include "qemu/module.h"
18 
19 static uint64_t xen_apic_mem_read(void *opaque, hwaddr addr,
20                                   unsigned size)
21 {
22     return ~(uint64_t)0;
23 }
24 
25 static void xen_apic_mem_write(void *opaque, hwaddr addr,
26                                uint64_t data, unsigned size)
27 {
28     if (size != sizeof(uint32_t)) {
29         fprintf(stderr, "Xen: APIC write data size = %d, invalid\n", size);
30         return;
31     }
32 
33     xen_hvm_inject_msi(addr, data);
34 }
35 
36 static const MemoryRegionOps xen_apic_io_ops = {
37     .read = xen_apic_mem_read,
38     .write = xen_apic_mem_write,
39     .endianness = DEVICE_NATIVE_ENDIAN,
40 };
41 
42 static void xen_apic_realize(DeviceState *dev, Error **errp)
43 {
44     APICCommonState *s = APIC_COMMON(dev);
45 
46     s->vapic_control = 0;
47     memory_region_init_io(&s->io_memory, OBJECT(s), &xen_apic_io_ops, s,
48                           "xen-apic-msi", APIC_SPACE_SIZE);
49     msi_nonbroken = true;
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_send_msi(MSIMessage *msi)
74 {
75     xen_hvm_inject_msi(msi->address, msi->data);
76 }
77 
78 static void xen_apic_class_init(ObjectClass *klass, void *data)
79 {
80     APICCommonClass *k = APIC_COMMON_CLASS(klass);
81 
82     k->realize = xen_apic_realize;
83     k->set_base = xen_apic_set_base;
84     k->set_tpr = xen_apic_set_tpr;
85     k->get_tpr = xen_apic_get_tpr;
86     k->vapic_base_update = xen_apic_vapic_base_update;
87     k->external_nmi = xen_apic_external_nmi;
88     k->send_msi = xen_send_msi;
89 }
90 
91 static const TypeInfo xen_apic_info = {
92     .name = "xen-apic",
93     .parent = TYPE_APIC_COMMON,
94     .instance_size = sizeof(APICCommonState),
95     .class_init = xen_apic_class_init,
96 };
97 
98 static void xen_apic_register_types(void)
99 {
100     type_register_static(&xen_apic_info);
101 }
102 
103 type_init(xen_apic_register_types)
104