// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* xen-stub.c - stub drivers to reserve space for Xen
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*
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* Copyright (C) 2012 Intel Corporation
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* Author: Liu Jinsong <jinsong.liu@intel.com>
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* Author: Jiang Yunhong <yunhong.jiang@intel.com>
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*
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* Copyright (C) 2012 Oracle Inc
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* Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <xen/acpi.h>
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#ifdef CONFIG_ACPI
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/*--------------------------------------------
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stub driver for Xen memory hotplug
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--------------------------------------------*/
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static const struct acpi_device_id memory_device_ids[] = {
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{ACPI_MEMORY_DEVICE_HID, 0},
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{"", 0},
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};
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static struct acpi_driver xen_stub_memory_device_driver = {
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/* same name as native memory driver to block native loaded */
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.name = "acpi_memhotplug",
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.class = ACPI_MEMORY_DEVICE_CLASS,
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.ids = memory_device_ids,
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};
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int xen_stub_memory_device_init(void)
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{
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if (!xen_initial_domain())
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return -ENODEV;
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/* just reserve space for Xen, block native driver loaded */
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return acpi_bus_register_driver(&xen_stub_memory_device_driver);
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}
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EXPORT_SYMBOL_GPL(xen_stub_memory_device_init);
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subsys_initcall(xen_stub_memory_device_init);
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void xen_stub_memory_device_exit(void)
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{
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acpi_bus_unregister_driver(&xen_stub_memory_device_driver);
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}
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EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit);
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/*--------------------------------------------
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stub driver for Xen cpu hotplug
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--------------------------------------------*/
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static const struct acpi_device_id processor_device_ids[] = {
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{ACPI_PROCESSOR_OBJECT_HID, 0},
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{ACPI_PROCESSOR_DEVICE_HID, 0},
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{"", 0},
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};
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static struct acpi_driver xen_stub_processor_driver = {
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/* same name as native processor driver to block native loaded */
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.name = "processor",
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.class = ACPI_PROCESSOR_CLASS,
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.ids = processor_device_ids,
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};
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int xen_stub_processor_init(void)
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{
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if (!xen_initial_domain())
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return -ENODEV;
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/* just reserve space for Xen, block native driver loaded */
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return acpi_bus_register_driver(&xen_stub_processor_driver);
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}
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EXPORT_SYMBOL_GPL(xen_stub_processor_init);
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subsys_initcall(xen_stub_processor_init);
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void xen_stub_processor_exit(void)
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{
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acpi_bus_unregister_driver(&xen_stub_processor_driver);
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}
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EXPORT_SYMBOL_GPL(xen_stub_processor_exit);
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#endif
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