1 /*
2 * ap bridge
3 *
4 * Copyright 2018 IBM Corp.
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or (at
7 * your option) any later version. See the COPYING file in the top-level
8 * directory.
9 */
10 #include "qemu/osdep.h"
11 #include "qapi/error.h"
12 #include "hw/sysbus.h"
13 #include "qemu/bitops.h"
14 #include "hw/s390x/ap-bridge.h"
15 #include "cpu.h"
16
ap_bus_get_dev_path(DeviceState * dev)17 static char *ap_bus_get_dev_path(DeviceState *dev)
18 {
19 /* at most one */
20 return g_strdup_printf("/1");
21 }
22
ap_bus_class_init(ObjectClass * oc,void * data)23 static void ap_bus_class_init(ObjectClass *oc, void *data)
24 {
25 BusClass *k = BUS_CLASS(oc);
26
27 k->get_dev_path = ap_bus_get_dev_path;
28 /* More than one ap device does not make sense */
29 k->max_dev = 1;
30 }
31
32 static const TypeInfo ap_bus_info = {
33 .name = TYPE_AP_BUS,
34 .parent = TYPE_BUS,
35 .instance_size = 0,
36 .class_init = ap_bus_class_init,
37 };
38
s390_init_ap(void)39 void s390_init_ap(void)
40 {
41 DeviceState *dev;
42
43 /* If no AP instructions then no need for AP bridge */
44 if (!s390_has_feat(S390_FEAT_AP)) {
45 return;
46 }
47
48 /* Create bridge device */
49 dev = qdev_create(NULL, TYPE_AP_BRIDGE);
50 object_property_add_child(qdev_get_machine(), TYPE_AP_BRIDGE,
51 OBJECT(dev), NULL);
52 qdev_init_nofail(dev);
53
54 /* Create bus on bridge device */
55 qbus_create(TYPE_AP_BUS, dev, TYPE_AP_BUS);
56 }
57
ap_bridge_class_init(ObjectClass * oc,void * data)58 static void ap_bridge_class_init(ObjectClass *oc, void *data)
59 {
60 DeviceClass *dc = DEVICE_CLASS(oc);
61
62 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
63 }
64
65 static const TypeInfo ap_bridge_info = {
66 .name = TYPE_AP_BRIDGE,
67 .parent = TYPE_SYS_BUS_DEVICE,
68 .instance_size = 0,
69 .class_init = ap_bridge_class_init,
70 };
71
ap_register(void)72 static void ap_register(void)
73 {
74 type_register_static(&ap_bridge_info);
75 type_register_static(&ap_bus_info);
76 }
77
78 type_init(ap_register)
79