LXR linux/drivers/xen/xen-stub.c

   1/*
   2 * xen-stub.c - stub drivers to reserve space for Xen
   3 *
   4 * Copyright (C) 2012 Intel Corporation
   5 *    Author: Liu Jinsong <jinsong.liu@intel.com>
   6 *    Author: Jiang Yunhong <yunhong.jiang@intel.com>
   7 *
   8 * Copyright (C) 2012 Oracle Inc
   9 *    Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or (at
  14 * your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful, but
  17 * WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19 * NON INFRINGEMENT.  See the GNU General Public License for more
  20 * details.
  21 */
  22
  23#include <linux/kernel.h>
  24#include <linux/init.h>
  25#include <linux/export.h>
  26#include <linux/types.h>
  27#include <linux/acpi.h>
  28#include <xen/acpi.h>
  29
  30#ifdef CONFIG_ACPI
  31
  32/*--------------------------------------------
  33        stub driver for Xen memory hotplug
  34--------------------------------------------*/
  35
  36static const struct acpi_device_id memory_device_ids[] = {
  37        {ACPI_MEMORY_DEVICE_HID, 0},
  38        {"", 0},
  39};
  40
  41static struct acpi_driver xen_stub_memory_device_driver = {
  42        /* same name as native memory driver to block native loaded */
  43        .name = "acpi_memhotplug",
  44        .class = ACPI_MEMORY_DEVICE_CLASS,
  45        .ids = memory_device_ids,
  46};
  47
  48int xen_stub_memory_device_init(void)
  49{
  50        if (!xen_initial_domain())
  51                return -ENODEV;
  52
  53        /* just reserve space for Xen, block native driver loaded */
  54        return acpi_bus_register_driver(&xen_stub_memory_device_driver);
  55}
  56EXPORT_SYMBOL_GPL(xen_stub_memory_device_init);
  57subsys_initcall(xen_stub_memory_device_init);
  58
  59void xen_stub_memory_device_exit(void)
  60{
  61        acpi_bus_unregister_driver(&xen_stub_memory_device_driver);
  62}
  63EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit);
  64
  65
  66/*--------------------------------------------
  67        stub driver for Xen cpu hotplug
  68--------------------------------------------*/
  69
  70static const struct acpi_device_id processor_device_ids[] = {
  71        {ACPI_PROCESSOR_OBJECT_HID, 0},
  72        {ACPI_PROCESSOR_DEVICE_HID, 0},
  73        {"", 0},
  74};
  75
  76static struct acpi_driver xen_stub_processor_driver = {
  77        /* same name as native processor driver to block native loaded */
  78        .name = "processor",
  79        .class = ACPI_PROCESSOR_CLASS,
  80        .ids = processor_device_ids,
  81};
  82
  83int xen_stub_processor_init(void)
  84{
  85        if (!xen_initial_domain())
  86                return -ENODEV;
  87
  88        /* just reserve space for Xen, block native driver loaded */
  89        return acpi_bus_register_driver(&xen_stub_processor_driver);
  90}
  91EXPORT_SYMBOL_GPL(xen_stub_processor_init);
  92subsys_initcall(xen_stub_processor_init);
  93
  94void xen_stub_processor_exit(void)
  95{
  96        acpi_bus_unregister_driver(&xen_stub_processor_driver);
  97}
  98EXPORT_SYMBOL_GPL(xen_stub_processor_exit);
  99
 100#endif
 101