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/******************************************************************************

 *

 * Module Name: utosi - Support for the _OSI predefined control method

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2015, Intel Corp.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

 *    substantially similar to the "NO WARRANTY" disclaimer below

 *    ("Disclaimer") and any redistribution must be conditioned upon

 *    including a substantially similar Disclaimer requirement for further

 *    binary redistribution.

 * 3. Neither the names of the above-listed copyright holders nor the names

 *    of any contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * NO WARRANTY

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 */

#include 

#include "accommon.h"

#define _COMPONENT          ACPI_UTILITIES

ACPI_MODULE_NAME("utosi")

/******************************************************************************

 *

 * ACPICA policy for new _OSI strings:

 *

 * It is the stated policy of ACPICA that new _OSI strings will be integrated

 * into this module as soon as possible after they are defined. It is strongly

 * recommended that all ACPICA hosts mirror this policy and integrate any

 * changes to this module as soon as possible. There are several historical

 * reasons behind this policy:

 *

 * 1) New BIOSs tend to test only the case where the host responds TRUE to

 *    the latest version of Windows, which would respond to the latest/newest

 *    _OSI string. Not responding TRUE to the latest version of Windows will

 *    risk executing untested code paths throughout the DSDT and SSDTs.

 *

 * 2) If a new _OSI string is recognized only after a significant delay, this

 *    has the potential to cause problems on existing working machines because

 *    of the possibility that a new and different path through the ASL code

 *    will be executed.

 *

 * 3) New _OSI strings are tending to come out about once per year. A delay

 *    in recognizing a new string for a significant amount of time risks the

 *    release of another string which only compounds the initial problem.

 *

 *****************************************************************************/

/*

 * Strings supported by the _OSI predefined control method (which is

 * implemented internally within this module.)

 *

 * March 2009: Removed "Linux" as this host no longer wants to respond true

 * for this string. Basically, the only safe OS strings are windows-related

 * and in many or most cases represent the only test path within the

 * BIOS-provided ASL code.

 *

 * The last element of each entry is used to track the newest version of

 * Windows that the BIOS has requested.

 */

static struct acpi_interface_info acpi_default_supported_interfaces[] = {

	/* Operating System Vendor Strings */

	{"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000},	/* Windows 2000 */

	{"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP},	/* Windows XP */

	{"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1},	/* Windows XP SP1 */

	{"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003},	/* Windows Server 2003 */

	{"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2},	/* Windows XP SP2 */

	{"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1},	/* Windows Server 2003 SP1 - Added 03/2006 */

	{"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA},	/* Windows vista - Added 03/2006 */

	{"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008},	/* Windows Server 2008 - Added 09/2009 */

	{"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1},	/* Windows Vista SP1 - Added 09/2009 */

	{"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2},	/* Windows Vista SP2 - Added 09/2010 */

	{"Windows 2009", NULL, 0, ACPI_OSI_WIN_7},	/* Windows 7 and Server 2008 R2 - Added 09/2009 */

	{"Windows 2012", NULL, 0, ACPI_OSI_WIN_8},	/* Windows 8 and Server 2012 - Added 08/2012 */

	{"Windows 2013", NULL, 0, ACPI_OSI_WIN_8},	/* Windows 8.1 and Server 2012 R2 - Added 01/2014 */

	{"Windows 2015", NULL, 0, ACPI_OSI_WIN_10},	/* Windows 10 - Added 03/2015 */

	/* Feature Group Strings */

	{"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0},

	/*

	 * All "optional" feature group strings (features that are implemented

	 * by the host) should be dynamically modified to VALID by the host via

	 * acpi_install_interface or acpi_update_interfaces. Such optional feature

	 * group strings are set as INVALID by default here.

	 */

	{"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},

	{"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},

	{"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},

	{"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},

	{"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}

};

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_initialize_interfaces

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Initialize the global _OSI supported interfaces list

 *

 ******************************************************************************/

acpi_status acpi_ut_initialize_interfaces(void)

{

	acpi_status status;

	u32 i;

	status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);

	if (ACPI_FAILURE(status)) {

		return (status);

	}

	acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;

	/* Link the static list of supported interfaces */

	for (i = 0;

	     i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);

	     i++) {

		acpi_default_supported_interfaces[i].next =

		    &acpi_default_supported_interfaces[(acpi_size) i + 1];

	}

	acpi_os_release_mutex(acpi_gbl_osi_mutex);

	return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_interface_terminate

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Delete all interfaces in the global list. Sets

 *              acpi_gbl_supported_interfaces to NULL.

 *

 ******************************************************************************/

acpi_status acpi_ut_interface_terminate(void)

{

	acpi_status status;

	struct acpi_interface_info *next_interface;

	status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);

	if (ACPI_FAILURE(status)) {

		return (status);

	}

	next_interface = acpi_gbl_supported_interfaces;

	while (next_interface) {

		acpi_gbl_supported_interfaces = next_interface->next;

		if (next_interface->flags & ACPI_OSI_DYNAMIC) {

			/* Only interfaces added at runtime can be freed */

			ACPI_FREE(next_interface->name);

			ACPI_FREE(next_interface);

		} else {

			/* Interface is in static list. Reset it to invalid or valid. */

			if (next_interface->flags & ACPI_OSI_DEFAULT_INVALID) {

				next_interface->flags |= ACPI_OSI_INVALID;

			} else {

				next_interface->flags &= ~ACPI_OSI_INVALID;

			}

		}

		next_interface = acpi_gbl_supported_interfaces;

	}

	acpi_os_release_mutex(acpi_gbl_osi_mutex);

	return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_install_interface

 *

 * PARAMETERS:  interface_name      - The interface to install

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install the interface into the global interface list.

 *              Caller MUST hold acpi_gbl_osi_mutex

 *

 ******************************************************************************/

acpi_status acpi_ut_install_interface(acpi_string interface_name)

{

	struct acpi_interface_info *interface_info;

	/* Allocate info block and space for the name string */

	interface_info =

	    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));

	if (!interface_info) {

		return (AE_NO_MEMORY);

	}

	interface_info->name = ACPI_ALLOCATE_ZEROED(strlen(interface_name) + 1);

	if (!interface_info->name) {

		ACPI_FREE(interface_info);

		return (AE_NO_MEMORY);

	}

	/* Initialize new info and insert at the head of the global list */

	strcpy(interface_info->name, interface_name);

	interface_info->flags = ACPI_OSI_DYNAMIC;

	interface_info->next = acpi_gbl_supported_interfaces;

	acpi_gbl_supported_interfaces = interface_info;

	return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_remove_interface

 *

 * PARAMETERS:  interface_name      - The interface to remove

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove the interface from the global interface list.

 *              Caller MUST hold acpi_gbl_osi_mutex

 *

 ******************************************************************************/

acpi_status acpi_ut_remove_interface(acpi_string interface_name)

{

	struct acpi_interface_info *previous_interface;

	struct acpi_interface_info *next_interface;

	previous_interface = next_interface = acpi_gbl_supported_interfaces;

	while (next_interface) {

		if (!strcmp(interface_name, next_interface->name)) {

			/* Found: name is in either the static list or was added at runtime */

			if (next_interface->flags & ACPI_OSI_DYNAMIC) {

				/* Interface was added dynamically, remove and free it */

				if (previous_interface == next_interface) {

					acpi_gbl_supported_interfaces =

					    next_interface->next;

				} else {

					previous_interface->next =

					    next_interface->next;

				}

				ACPI_FREE(next_interface->name);

				ACPI_FREE(next_interface);

			} else {

				/*

				 * Interface is in static list. If marked invalid, then it

				 * does not actually exist. Else, mark it invalid.

				 */

				if (next_interface->flags & ACPI_OSI_INVALID) {

					return (AE_NOT_EXIST);

				}

				next_interface->flags |= ACPI_OSI_INVALID;

			}

			return (AE_OK);

		}

		previous_interface = next_interface;

		next_interface = next_interface->next;

	}

	/* Interface was not found */

	return (AE_NOT_EXIST);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_update_interfaces

 *

 * PARAMETERS:  action              - Actions to be performed during the

 *                                    update

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor

 *              strings or/and feature group strings.

 *              Caller MUST hold acpi_gbl_osi_mutex

 *

 ******************************************************************************/

acpi_status acpi_ut_update_interfaces(u8 action)

{

	struct acpi_interface_info *next_interface;

	next_interface = acpi_gbl_supported_interfaces;

	while (next_interface) {

		if (((next_interface->flags & ACPI_OSI_FEATURE) &&

		     (action & ACPI_FEATURE_STRINGS)) ||

		    (!(next_interface->flags & ACPI_OSI_FEATURE) &&

		     (action & ACPI_VENDOR_STRINGS))) {

			if (action & ACPI_DISABLE_INTERFACES) {

				/* Mark the interfaces as invalid */

				next_interface->flags |= ACPI_OSI_INVALID;

			} else {

				/* Mark the interfaces as valid */

				next_interface->flags &= ~ACPI_OSI_INVALID;

			}

		}

		next_interface = next_interface->next;

	}

	return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_get_interface

 *

 * PARAMETERS:  interface_name      - The interface to find

 *

 * RETURN:      struct acpi_interface_info if found. NULL if not found.

 *

 * DESCRIPTION: Search for the specified interface name in the global list.

 *              Caller MUST hold acpi_gbl_osi_mutex

 *

 ******************************************************************************/

struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)

{

	struct acpi_interface_info *next_interface;

	next_interface = acpi_gbl_supported_interfaces;

	while (next_interface) {

		if (!strcmp(interface_name, next_interface->name)) {

			return (next_interface);

		}

		next_interface = next_interface->next;

	}

	return (NULL);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ut_osi_implementation

 *

 * PARAMETERS:  walk_state          - Current walk state

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Implementation of the _OSI predefined control method. When

 *              an invocation of _OSI is encountered in the system AML,

 *              control is transferred to this function.

 *

 ******************************************************************************/

acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)

{

	union acpi_operand_object *string_desc;

	union acpi_operand_object *return_desc;

	struct acpi_interface_info *interface_info;

	acpi_interface_handler interface_handler;

	acpi_status status;

	u32 return_value;

	ACPI_FUNCTION_TRACE(ut_osi_implementation);

	/* Validate the string input argument (from the AML caller) */

	string_desc = walk_state->arguments[0].object;

	if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {

		return_ACPI_STATUS(AE_TYPE);

	}

	/* Create a return object */

	return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);

	if (!return_desc) {

		return_ACPI_STATUS(AE_NO_MEMORY);

	}

	/* Default return value is 0, NOT SUPPORTED */

	return_value = 0;

	status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);

	if (ACPI_FAILURE(status)) {

		acpi_ut_remove_reference(return_desc);

		return_ACPI_STATUS(status);

	}

	/* Lookup the interface in the global _OSI list */

	interface_info = acpi_ut_get_interface(string_desc->string.pointer);

	if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {

		/*

		 * The interface is supported.

		 * Update the osi_data if necessary. We keep track of the latest

		 * version of Windows that has been requested by the BIOS.

		 */

		if (interface_info->value > acpi_gbl_osi_data) {

			acpi_gbl_osi_data = interface_info->value;

		}

		return_value = ACPI_UINT32_MAX;

	}

	acpi_os_release_mutex(acpi_gbl_osi_mutex);

	/*

	 * Invoke an optional _OSI interface handler. The host OS may wish

	 * to do some interface-specific handling. For example, warn about

	 * certain interfaces or override the true/false support value.

	 */

	interface_handler = acpi_gbl_interface_handler;

	if (interface_handler) {

		return_value =

		    interface_handler(string_desc->string.pointer,

				      return_value);

	}

	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,

			      "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",

			      string_desc->string.pointer,

			      return_value == 0 ? "not " : ""));

	/* Complete the return object */

	return_desc->integer.value = return_value;

	walk_state->return_desc = return_desc;

	return_ACPI_STATUS(AE_OK);

}