1 files changed, 90 insertions, 0 deletions
diff --git a/hw/s390x/ap-bridge.c b/hw/s390x/ap-bridge.c
new file mode 100644
index 000000000..ef8fa2b15
--- /dev/null
+++ b/hw/s390x/ap-bridge.c
@@ -0,0 +1,90 @@
+/*
+ * ap bridge
+ *
+ * Copyright 2018 IBM Corp.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/sysbus.h"
+#include "qemu/bitops.h"
+#include "qemu/module.h"
+#include "hw/s390x/ap-bridge.h"
+#include "cpu.h"
+
+static char *ap_bus_get_dev_path(DeviceState *dev)
+{
+    /* at most one */
+    return g_strdup_printf("/1");
+}
+
+static void ap_bus_class_init(ObjectClass *oc, void *data)
+{
+    BusClass *k = BUS_CLASS(oc);
+
+    k->get_dev_path = ap_bus_get_dev_path;
+    /* More than one ap device does not make sense */
+    k->max_dev = 1;
+}
+
+static const TypeInfo ap_bus_info = {
+    .name = TYPE_AP_BUS,
+    .parent = TYPE_BUS,
+    .instance_size = 0,
+    .class_init = ap_bus_class_init,
+};
+
+void s390_init_ap(void)
+{
+    DeviceState *dev;
+    BusState *bus;
+
+    /* If no AP instructions then no need for AP bridge */
+    if (!s390_has_feat(S390_FEAT_AP)) {
+        return;
+    }
+
+    /* Create bridge device */
+    dev = qdev_new(TYPE_AP_BRIDGE);
+    object_property_add_child(qdev_get_machine(), TYPE_AP_BRIDGE,
+                              OBJECT(dev));
+    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
+
+    /* Create bus on bridge device */
+    bus = qbus_new(TYPE_AP_BUS, dev, TYPE_AP_BUS);
+
+    /* Enable hotplugging */
+    qbus_set_hotplug_handler(bus, OBJECT(dev));
+ }
+
+static void ap_bridge_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+    HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
+
+    hc->unplug = qdev_simple_device_unplug_cb;
+    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+}
+
+static const TypeInfo ap_bridge_info = {
+    .name          = TYPE_AP_BRIDGE,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = 0,
+    .class_init    = ap_bridge_class_init,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_HOTPLUG_HANDLER },
+        { }
+    }
+};
+
+static void ap_register(void)
+{
+    type_register_static(&ap_bridge_info);
+    type_register_static(&ap_bus_info);
+}
+
+type_init(ap_register)