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
36 static const struct acpi_device_id memory_device_ids[] = {
37 {ACPI_MEMORY_DEVICE_HID, 0},
38 {"", 0},
39 };
40
41 static 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
xen_stub_memory_device_init(void)48 int 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 }
56 EXPORT_SYMBOL_GPL(xen_stub_memory_device_init);
57 subsys_initcall(xen_stub_memory_device_init);
58
xen_stub_memory_device_exit(void)59 void xen_stub_memory_device_exit(void)
60 {
61 acpi_bus_unregister_driver(&xen_stub_memory_device_driver);
62 }
63 EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit);
64
65
66 /*--------------------------------------------
67 stub driver for Xen cpu hotplug
68 --------------------------------------------*/
69
70 static const struct acpi_device_id processor_device_ids[] = {
71 {ACPI_PROCESSOR_OBJECT_HID, 0},
72 {ACPI_PROCESSOR_DEVICE_HID, 0},
73 {"", 0},
74 };
75
76 static 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
xen_stub_processor_init(void)83 int 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 }
91 EXPORT_SYMBOL_GPL(xen_stub_processor_init);
92 subsys_initcall(xen_stub_processor_init);
93
xen_stub_processor_exit(void)94 void xen_stub_processor_exit(void)
95 {
96 acpi_bus_unregister_driver(&xen_stub_processor_driver);
97 }
98 EXPORT_SYMBOL_GPL(xen_stub_processor_exit);
99
100 #endif
101