projects / thirdparty / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |