2 * xen-stub.c - stub drivers to reserve space for Xen
4 * Copyright (C) 2012 Intel Corporation
5 * Author: Liu Jinsong <jinsong.liu@intel.com>
6 * Author: Jiang Yunhong <yunhong.jiang@intel.com>
8 * Copyright (C) 2012 Oracle Inc
9 * Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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.
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
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 <acpi/acpi_drivers.h>
33 /*--------------------------------------------
34 stub driver for Xen memory hotplug
35 --------------------------------------------*/
37 static const struct acpi_device_id memory_device_ids[] = {
38 {ACPI_MEMORY_DEVICE_HID, 0},
42 static struct acpi_driver xen_stub_memory_device_driver = {
43 /* same name as native memory driver to block native loaded */
44 .name = "acpi_memhotplug",
45 .class = ACPI_MEMORY_DEVICE_CLASS,
46 .ids = memory_device_ids,
49 int xen_stub_memory_device_init(void)
51 if (!xen_initial_domain())
54 /* just reserve space for Xen, block native driver loaded */
55 return acpi_bus_register_driver(&xen_stub_memory_device_driver);
57 EXPORT_SYMBOL_GPL(xen_stub_memory_device_init);
58 subsys_initcall(xen_stub_memory_device_init);
60 void xen_stub_memory_device_exit(void)
62 acpi_bus_unregister_driver(&xen_stub_memory_device_driver);
64 EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit);
67 /*--------------------------------------------
68 stub driver for Xen cpu hotplug
69 --------------------------------------------*/
71 static const struct acpi_device_id processor_device_ids[] = {
72 {ACPI_PROCESSOR_OBJECT_HID, 0},
73 {ACPI_PROCESSOR_DEVICE_HID, 0},
77 static struct acpi_driver xen_stub_processor_driver = {
78 /* same name as native processor driver to block native loaded */
80 .class = ACPI_PROCESSOR_CLASS,
81 .ids = processor_device_ids,
84 int xen_stub_processor_init(void)
86 if (!xen_initial_domain())
89 /* just reserve space for Xen, block native driver loaded */
90 return acpi_bus_register_driver(&xen_stub_processor_driver);
92 EXPORT_SYMBOL_GPL(xen_stub_processor_init);
93 subsys_initcall(xen_stub_processor_init);
95 void xen_stub_processor_exit(void)
97 acpi_bus_unregister_driver(&xen_stub_processor_driver);
99 EXPORT_SYMBOL_GPL(xen_stub_processor_exit);