1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * xen-stub.c - stub drivers to reserve space for Xen
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2012 Intel Corporation
6*4882a593Smuzhiyun * Author: Liu Jinsong <jinsong.liu@intel.com>
7*4882a593Smuzhiyun * Author: Jiang Yunhong <yunhong.jiang@intel.com>
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Copyright (C) 2012 Oracle Inc
10*4882a593Smuzhiyun * Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/kernel.h>
14*4882a593Smuzhiyun #include <linux/init.h>
15*4882a593Smuzhiyun #include <linux/export.h>
16*4882a593Smuzhiyun #include <linux/types.h>
17*4882a593Smuzhiyun #include <linux/acpi.h>
18*4882a593Smuzhiyun #include <xen/acpi.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #ifdef CONFIG_ACPI
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /*--------------------------------------------
23*4882a593Smuzhiyun stub driver for Xen memory hotplug
24*4882a593Smuzhiyun --------------------------------------------*/
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun static const struct acpi_device_id memory_device_ids[] = {
27*4882a593Smuzhiyun {ACPI_MEMORY_DEVICE_HID, 0},
28*4882a593Smuzhiyun {"", 0},
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun static struct acpi_driver xen_stub_memory_device_driver = {
32*4882a593Smuzhiyun /* same name as native memory driver to block native loaded */
33*4882a593Smuzhiyun .name = "acpi_memhotplug",
34*4882a593Smuzhiyun .class = ACPI_MEMORY_DEVICE_CLASS,
35*4882a593Smuzhiyun .ids = memory_device_ids,
36*4882a593Smuzhiyun };
37*4882a593Smuzhiyun
xen_stub_memory_device_init(void)38*4882a593Smuzhiyun int xen_stub_memory_device_init(void)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun if (!xen_initial_domain())
41*4882a593Smuzhiyun return -ENODEV;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun /* just reserve space for Xen, block native driver loaded */
44*4882a593Smuzhiyun return acpi_bus_register_driver(&xen_stub_memory_device_driver);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(xen_stub_memory_device_init);
47*4882a593Smuzhiyun subsys_initcall(xen_stub_memory_device_init);
48*4882a593Smuzhiyun
xen_stub_memory_device_exit(void)49*4882a593Smuzhiyun void xen_stub_memory_device_exit(void)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun acpi_bus_unregister_driver(&xen_stub_memory_device_driver);
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun /*--------------------------------------------
57*4882a593Smuzhiyun stub driver for Xen cpu hotplug
58*4882a593Smuzhiyun --------------------------------------------*/
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun static const struct acpi_device_id processor_device_ids[] = {
61*4882a593Smuzhiyun {ACPI_PROCESSOR_OBJECT_HID, 0},
62*4882a593Smuzhiyun {ACPI_PROCESSOR_DEVICE_HID, 0},
63*4882a593Smuzhiyun {"", 0},
64*4882a593Smuzhiyun };
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun static struct acpi_driver xen_stub_processor_driver = {
67*4882a593Smuzhiyun /* same name as native processor driver to block native loaded */
68*4882a593Smuzhiyun .name = "processor",
69*4882a593Smuzhiyun .class = ACPI_PROCESSOR_CLASS,
70*4882a593Smuzhiyun .ids = processor_device_ids,
71*4882a593Smuzhiyun };
72*4882a593Smuzhiyun
xen_stub_processor_init(void)73*4882a593Smuzhiyun int xen_stub_processor_init(void)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun if (!xen_initial_domain())
76*4882a593Smuzhiyun return -ENODEV;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun /* just reserve space for Xen, block native driver loaded */
79*4882a593Smuzhiyun return acpi_bus_register_driver(&xen_stub_processor_driver);
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(xen_stub_processor_init);
82*4882a593Smuzhiyun subsys_initcall(xen_stub_processor_init);
83*4882a593Smuzhiyun
xen_stub_processor_exit(void)84*4882a593Smuzhiyun void xen_stub_processor_exit(void)
85*4882a593Smuzhiyun {
86*4882a593Smuzhiyun acpi_bus_unregister_driver(&xen_stub_processor_driver);
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(xen_stub_processor_exit);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun #endif
91