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4359375c | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
dcb93b96 LJ |
2 | /* |
3 | * xen-stub.c - stub drivers to reserve space for Xen | |
4 | * | |
5 | * Copyright (C) 2012 Intel Corporation | |
6 | * Author: Liu Jinsong <jinsong.liu@intel.com> | |
7 | * Author: Jiang Yunhong <yunhong.jiang@intel.com> | |
8 | * | |
9 | * Copyright (C) 2012 Oracle Inc | |
10 | * Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | |
dcb93b96 LJ |
11 | */ |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/export.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/acpi.h> | |
dcb93b96 LJ |
18 | #include <xen/acpi.h> |
19 | ||
b22ff77b LJ |
20 | #ifdef CONFIG_ACPI |
21 | ||
dcb93b96 LJ |
22 | /*-------------------------------------------- |
23 | stub driver for Xen memory hotplug | |
24 | --------------------------------------------*/ | |
25 | ||
dcb93b96 LJ |
26 | static const struct acpi_device_id memory_device_ids[] = { |
27 | {ACPI_MEMORY_DEVICE_HID, 0}, | |
28 | {"", 0}, | |
29 | }; | |
30 | ||
31 | static struct acpi_driver xen_stub_memory_device_driver = { | |
32 | /* same name as native memory driver to block native loaded */ | |
33 | .name = "acpi_memhotplug", | |
34 | .class = ACPI_MEMORY_DEVICE_CLASS, | |
35 | .ids = memory_device_ids, | |
36 | }; | |
37 | ||
38 | int xen_stub_memory_device_init(void) | |
39 | { | |
40 | if (!xen_initial_domain()) | |
41 | return -ENODEV; | |
42 | ||
43 | /* just reserve space for Xen, block native driver loaded */ | |
44 | return acpi_bus_register_driver(&xen_stub_memory_device_driver); | |
45 | } | |
46 | EXPORT_SYMBOL_GPL(xen_stub_memory_device_init); | |
47 | subsys_initcall(xen_stub_memory_device_init); | |
48 | ||
49 | void xen_stub_memory_device_exit(void) | |
50 | { | |
51 | acpi_bus_unregister_driver(&xen_stub_memory_device_driver); | |
52 | } | |
53 | EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit); | |
54 | ||
b22ff77b LJ |
55 | |
56 | /*-------------------------------------------- | |
57 | stub driver for Xen cpu hotplug | |
58 | --------------------------------------------*/ | |
59 | ||
60 | static const struct acpi_device_id processor_device_ids[] = { | |
61 | {ACPI_PROCESSOR_OBJECT_HID, 0}, | |
62 | {ACPI_PROCESSOR_DEVICE_HID, 0}, | |
63 | {"", 0}, | |
64 | }; | |
65 | ||
66 | static struct acpi_driver xen_stub_processor_driver = { | |
67 | /* same name as native processor driver to block native loaded */ | |
68 | .name = "processor", | |
69 | .class = ACPI_PROCESSOR_CLASS, | |
70 | .ids = processor_device_ids, | |
71 | }; | |
72 | ||
73 | int xen_stub_processor_init(void) | |
74 | { | |
75 | if (!xen_initial_domain()) | |
76 | return -ENODEV; | |
77 | ||
78 | /* just reserve space for Xen, block native driver loaded */ | |
79 | return acpi_bus_register_driver(&xen_stub_processor_driver); | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(xen_stub_processor_init); | |
82 | subsys_initcall(xen_stub_processor_init); | |
83 | ||
84 | void xen_stub_processor_exit(void) | |
85 | { | |
86 | acpi_bus_unregister_driver(&xen_stub_processor_driver); | |
87 | } | |
88 | EXPORT_SYMBOL_GPL(xen_stub_processor_exit); | |
89 | ||
dcb93b96 | 90 | #endif |