LXR qemu/hw/s390x/ap-bridge.c

   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
  17static char *ap_bus_get_dev_path(DeviceState *dev)
  18{
  19    /* at most one */
  20    return g_strdup_printf("/1");
  21}
  22
  23static 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
  32static 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
  39void 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
  58static 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
  65static 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
  72static void ap_register(void)
  73{
  74    type_register_static(&ap_bridge_info);
  75    type_register_static(&ap_bus_info);
  76}
  77
  78type_init(ap_register)
  79