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  1. /******************************************************************************
  2.  *
  3.  * Module Name: utosi - Support for the _OSI predefined control method
  4.  *
  5.  *****************************************************************************/
  6.  
  7. /*
  8.  * Copyright (C) 2000 - 2015, Intel Corp.
  9.  * All rights reserved.
  10.  *
  11.  * Redistribution and use in source and binary forms, with or without
  12.  * modification, are permitted provided that the following conditions
  13.  * are met:
  14.  * 1. Redistributions of source code must retain the above copyright
  15.  *    notice, this list of conditions, and the following disclaimer,
  16.  *    without modification.
  17.  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18.  *    substantially similar to the "NO WARRANTY" disclaimer below
  19.  *    ("Disclaimer") and any redistribution must be conditioned upon
  20.  *    including a substantially similar Disclaimer requirement for further
  21.  *    binary redistribution.
  22.  * 3. Neither the names of the above-listed copyright holders nor the names
  23.  *    of any contributors may be used to endorse or promote products derived
  24.  *    from this software without specific prior written permission.
  25.  *
  26.  * Alternatively, this software may be distributed under the terms of the
  27.  * GNU General Public License ("GPL") version 2 as published by the Free
  28.  * Software Foundation.
  29.  *
  30.  * NO WARRANTY
  31.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32.  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33.  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34.  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35.  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39.  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40.  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41.  * POSSIBILITY OF SUCH DAMAGES.
  42.  */
  43.  
  44. #include <acpi/acpi.h>
  45. #include "accommon.h"
  46.  
  47. #define _COMPONENT          ACPI_UTILITIES
  48. ACPI_MODULE_NAME("utosi")
  49.  
  50. /******************************************************************************
  51.  *
  52.  * ACPICA policy for new _OSI strings:
  53.  *
  54.  * It is the stated policy of ACPICA that new _OSI strings will be integrated
  55.  * into this module as soon as possible after they are defined. It is strongly
  56.  * recommended that all ACPICA hosts mirror this policy and integrate any
  57.  * changes to this module as soon as possible. There are several historical
  58.  * reasons behind this policy:
  59.  *
  60.  * 1) New BIOSs tend to test only the case where the host responds TRUE to
  61.  *    the latest version of Windows, which would respond to the latest/newest
  62.  *    _OSI string. Not responding TRUE to the latest version of Windows will
  63.  *    risk executing untested code paths throughout the DSDT and SSDTs.
  64.  *
  65.  * 2) If a new _OSI string is recognized only after a significant delay, this
  66.  *    has the potential to cause problems on existing working machines because
  67.  *    of the possibility that a new and different path through the ASL code
  68.  *    will be executed.
  69.  *
  70.  * 3) New _OSI strings are tending to come out about once per year. A delay
  71.  *    in recognizing a new string for a significant amount of time risks the
  72.  *    release of another string which only compounds the initial problem.
  73.  *
  74.  *****************************************************************************/
  75. /*
  76.  * Strings supported by the _OSI predefined control method (which is
  77.  * implemented internally within this module.)
  78.  *
  79.  * March 2009: Removed "Linux" as this host no longer wants to respond true
  80.  * for this string. Basically, the only safe OS strings are windows-related
  81.  * and in many or most cases represent the only test path within the
  82.  * BIOS-provided ASL code.
  83.  *
  84.  * The last element of each entry is used to track the newest version of
  85.  * Windows that the BIOS has requested.
  86.  */
  87. static struct acpi_interface_info acpi_default_supported_interfaces[] = {
  88.         /* Operating System Vendor Strings */
  89.  
  90.         {"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000},   /* Windows 2000 */
  91.         {"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP},     /* Windows XP */
  92.         {"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1},     /* Windows XP SP1 */
  93.         {"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003},      /* Windows Server 2003 */
  94.         {"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2},     /* Windows XP SP2 */
  95.         {"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1},      /* Windows Server 2003 SP1 - Added 03/2006 */
  96.         {"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA},  /* Windows vista - Added 03/2006 */
  97.         {"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008},      /* Windows Server 2008 - Added 09/2009 */
  98.         {"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1},  /* Windows Vista SP1 - Added 09/2009 */
  99.         {"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2},  /* Windows Vista SP2 - Added 09/2010 */
  100.         {"Windows 2009", NULL, 0, ACPI_OSI_WIN_7},      /* Windows 7 and Server 2008 R2 - Added 09/2009 */
  101.         {"Windows 2012", NULL, 0, ACPI_OSI_WIN_8},      /* Windows 8 and Server 2012 - Added 08/2012 */
  102.         {"Windows 2013", NULL, 0, ACPI_OSI_WIN_8},      /* Windows 8.1 and Server 2012 R2 - Added 01/2014 */
  103.         {"Windows 2015", NULL, 0, ACPI_OSI_WIN_10},     /* Windows 10 - Added 03/2015 */
  104.  
  105.         /* Feature Group Strings */
  106.  
  107.         {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0},
  108.  
  109.         /*
  110.          * All "optional" feature group strings (features that are implemented
  111.          * by the host) should be dynamically modified to VALID by the host via
  112.          * acpi_install_interface or acpi_update_interfaces. Such optional feature
  113.          * group strings are set as INVALID by default here.
  114.          */
  115.  
  116.         {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  117.         {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  118.         {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  119.         {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
  120.         {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}
  121. };
  122.  
  123. /*******************************************************************************
  124.  *
  125.  * FUNCTION:    acpi_ut_initialize_interfaces
  126.  *
  127.  * PARAMETERS:  None
  128.  *
  129.  * RETURN:      Status
  130.  *
  131.  * DESCRIPTION: Initialize the global _OSI supported interfaces list
  132.  *
  133.  ******************************************************************************/
  134.  
  135. acpi_status acpi_ut_initialize_interfaces(void)
  136. {
  137.         acpi_status status;
  138.         u32 i;
  139.  
  140.         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
  141.         if (ACPI_FAILURE(status)) {
  142.                 return (status);
  143.         }
  144.  
  145.         acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
  146.  
  147.         /* Link the static list of supported interfaces */
  148.  
  149.         for (i = 0;
  150.              i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
  151.              i++) {
  152.                 acpi_default_supported_interfaces[i].next =
  153.                     &acpi_default_supported_interfaces[(acpi_size) i + 1];
  154.         }
  155.  
  156.         acpi_os_release_mutex(acpi_gbl_osi_mutex);
  157.         return (AE_OK);
  158. }
  159.  
  160. /*******************************************************************************
  161.  *
  162.  * FUNCTION:    acpi_ut_interface_terminate
  163.  *
  164.  * PARAMETERS:  None
  165.  *
  166.  * RETURN:      Status
  167.  *
  168.  * DESCRIPTION: Delete all interfaces in the global list. Sets
  169.  *              acpi_gbl_supported_interfaces to NULL.
  170.  *
  171.  ******************************************************************************/
  172.  
  173. acpi_status acpi_ut_interface_terminate(void)
  174. {
  175.         acpi_status status;
  176.         struct acpi_interface_info *next_interface;
  177.  
  178.         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
  179.         if (ACPI_FAILURE(status)) {
  180.                 return (status);
  181.         }
  182.  
  183.         next_interface = acpi_gbl_supported_interfaces;
  184.         while (next_interface) {
  185.                 acpi_gbl_supported_interfaces = next_interface->next;
  186.  
  187.                 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
  188.  
  189.                         /* Only interfaces added at runtime can be freed */
  190.  
  191.                         ACPI_FREE(next_interface->name);
  192.                         ACPI_FREE(next_interface);
  193.                 } else {
  194.                         /* Interface is in static list. Reset it to invalid or valid. */
  195.  
  196.                         if (next_interface->flags & ACPI_OSI_DEFAULT_INVALID) {
  197.                                 next_interface->flags |= ACPI_OSI_INVALID;
  198.                         } else {
  199.                                 next_interface->flags &= ~ACPI_OSI_INVALID;
  200.                         }
  201.                 }
  202.  
  203.                 next_interface = acpi_gbl_supported_interfaces;
  204.         }
  205.  
  206.         acpi_os_release_mutex(acpi_gbl_osi_mutex);
  207.         return (AE_OK);
  208. }
  209.  
  210. /*******************************************************************************
  211.  *
  212.  * FUNCTION:    acpi_ut_install_interface
  213.  *
  214.  * PARAMETERS:  interface_name      - The interface to install
  215.  *
  216.  * RETURN:      Status
  217.  *
  218.  * DESCRIPTION: Install the interface into the global interface list.
  219.  *              Caller MUST hold acpi_gbl_osi_mutex
  220.  *
  221.  ******************************************************************************/
  222.  
  223. acpi_status acpi_ut_install_interface(acpi_string interface_name)
  224. {
  225.         struct acpi_interface_info *interface_info;
  226.  
  227.         /* Allocate info block and space for the name string */
  228.  
  229.         interface_info =
  230.             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
  231.         if (!interface_info) {
  232.                 return (AE_NO_MEMORY);
  233.         }
  234.  
  235.         interface_info->name = ACPI_ALLOCATE_ZEROED(strlen(interface_name) + 1);
  236.         if (!interface_info->name) {
  237.                 ACPI_FREE(interface_info);
  238.                 return (AE_NO_MEMORY);
  239.         }
  240.  
  241.         /* Initialize new info and insert at the head of the global list */
  242.  
  243.         strcpy(interface_info->name, interface_name);
  244.         interface_info->flags = ACPI_OSI_DYNAMIC;
  245.         interface_info->next = acpi_gbl_supported_interfaces;
  246.  
  247.         acpi_gbl_supported_interfaces = interface_info;
  248.         return (AE_OK);
  249. }
  250.  
  251. /*******************************************************************************
  252.  *
  253.  * FUNCTION:    acpi_ut_remove_interface
  254.  *
  255.  * PARAMETERS:  interface_name      - The interface to remove
  256.  *
  257.  * RETURN:      Status
  258.  *
  259.  * DESCRIPTION: Remove the interface from the global interface list.
  260.  *              Caller MUST hold acpi_gbl_osi_mutex
  261.  *
  262.  ******************************************************************************/
  263.  
  264. acpi_status acpi_ut_remove_interface(acpi_string interface_name)
  265. {
  266.         struct acpi_interface_info *previous_interface;
  267.         struct acpi_interface_info *next_interface;
  268.  
  269.         previous_interface = next_interface = acpi_gbl_supported_interfaces;
  270.         while (next_interface) {
  271.                 if (!strcmp(interface_name, next_interface->name)) {
  272.  
  273.                         /* Found: name is in either the static list or was added at runtime */
  274.  
  275.                         if (next_interface->flags & ACPI_OSI_DYNAMIC) {
  276.  
  277.                                 /* Interface was added dynamically, remove and free it */
  278.  
  279.                                 if (previous_interface == next_interface) {
  280.                                         acpi_gbl_supported_interfaces =
  281.                                             next_interface->next;
  282.                                 } else {
  283.                                         previous_interface->next =
  284.                                             next_interface->next;
  285.                                 }
  286.  
  287.                                 ACPI_FREE(next_interface->name);
  288.                                 ACPI_FREE(next_interface);
  289.                         } else {
  290.                                 /*
  291.                                  * Interface is in static list. If marked invalid, then it
  292.                                  * does not actually exist. Else, mark it invalid.
  293.                                  */
  294.                                 if (next_interface->flags & ACPI_OSI_INVALID) {
  295.                                         return (AE_NOT_EXIST);
  296.                                 }
  297.  
  298.                                 next_interface->flags |= ACPI_OSI_INVALID;
  299.                         }
  300.  
  301.                         return (AE_OK);
  302.                 }
  303.  
  304.                 previous_interface = next_interface;
  305.                 next_interface = next_interface->next;
  306.         }
  307.  
  308.         /* Interface was not found */
  309.  
  310.         return (AE_NOT_EXIST);
  311. }
  312.  
  313. /*******************************************************************************
  314.  *
  315.  * FUNCTION:    acpi_ut_update_interfaces
  316.  *
  317.  * PARAMETERS:  action              - Actions to be performed during the
  318.  *                                    update
  319.  *
  320.  * RETURN:      Status
  321.  *
  322.  * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor
  323.  *              strings or/and feature group strings.
  324.  *              Caller MUST hold acpi_gbl_osi_mutex
  325.  *
  326.  ******************************************************************************/
  327.  
  328. acpi_status acpi_ut_update_interfaces(u8 action)
  329. {
  330.         struct acpi_interface_info *next_interface;
  331.  
  332.         next_interface = acpi_gbl_supported_interfaces;
  333.         while (next_interface) {
  334.                 if (((next_interface->flags & ACPI_OSI_FEATURE) &&
  335.                      (action & ACPI_FEATURE_STRINGS)) ||
  336.                     (!(next_interface->flags & ACPI_OSI_FEATURE) &&
  337.                      (action & ACPI_VENDOR_STRINGS))) {
  338.                         if (action & ACPI_DISABLE_INTERFACES) {
  339.  
  340.                                 /* Mark the interfaces as invalid */
  341.  
  342.                                 next_interface->flags |= ACPI_OSI_INVALID;
  343.                         } else {
  344.                                 /* Mark the interfaces as valid */
  345.  
  346.                                 next_interface->flags &= ~ACPI_OSI_INVALID;
  347.                         }
  348.                 }
  349.  
  350.                 next_interface = next_interface->next;
  351.         }
  352.  
  353.         return (AE_OK);
  354. }
  355.  
  356. /*******************************************************************************
  357.  *
  358.  * FUNCTION:    acpi_ut_get_interface
  359.  *
  360.  * PARAMETERS:  interface_name      - The interface to find
  361.  *
  362.  * RETURN:      struct acpi_interface_info if found. NULL if not found.
  363.  *
  364.  * DESCRIPTION: Search for the specified interface name in the global list.
  365.  *              Caller MUST hold acpi_gbl_osi_mutex
  366.  *
  367.  ******************************************************************************/
  368.  
  369. struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
  370. {
  371.         struct acpi_interface_info *next_interface;
  372.  
  373.         next_interface = acpi_gbl_supported_interfaces;
  374.         while (next_interface) {
  375.                 if (!strcmp(interface_name, next_interface->name)) {
  376.                         return (next_interface);
  377.                 }
  378.  
  379.                 next_interface = next_interface->next;
  380.         }
  381.  
  382.         return (NULL);
  383. }
  384.  
  385. /*******************************************************************************
  386.  *
  387.  * FUNCTION:    acpi_ut_osi_implementation
  388.  *
  389.  * PARAMETERS:  walk_state          - Current walk state
  390.  *
  391.  * RETURN:      Status
  392.  *
  393.  * DESCRIPTION: Implementation of the _OSI predefined control method. When
  394.  *              an invocation of _OSI is encountered in the system AML,
  395.  *              control is transferred to this function.
  396.  *
  397.  ******************************************************************************/
  398.  
  399. acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
  400. {
  401.         union acpi_operand_object *string_desc;
  402.         union acpi_operand_object *return_desc;
  403.         struct acpi_interface_info *interface_info;
  404.         acpi_interface_handler interface_handler;
  405.         acpi_status status;
  406.         u32 return_value;
  407.  
  408.         ACPI_FUNCTION_TRACE(ut_osi_implementation);
  409.  
  410.         /* Validate the string input argument (from the AML caller) */
  411.  
  412.         string_desc = walk_state->arguments[0].object;
  413.         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
  414.                 return_ACPI_STATUS(AE_TYPE);
  415.         }
  416.  
  417.         /* Create a return object */
  418.  
  419.         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
  420.         if (!return_desc) {
  421.                 return_ACPI_STATUS(AE_NO_MEMORY);
  422.         }
  423.  
  424.         /* Default return value is 0, NOT SUPPORTED */
  425.  
  426.         return_value = 0;
  427.         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
  428.         if (ACPI_FAILURE(status)) {
  429.                 acpi_ut_remove_reference(return_desc);
  430.                 return_ACPI_STATUS(status);
  431.         }
  432.  
  433.         /* Lookup the interface in the global _OSI list */
  434.  
  435.         interface_info = acpi_ut_get_interface(string_desc->string.pointer);
  436.         if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
  437.                 /*
  438.                  * The interface is supported.
  439.                  * Update the osi_data if necessary. We keep track of the latest
  440.                  * version of Windows that has been requested by the BIOS.
  441.                  */
  442.                 if (interface_info->value > acpi_gbl_osi_data) {
  443.                         acpi_gbl_osi_data = interface_info->value;
  444.                 }
  445.  
  446.                 return_value = ACPI_UINT32_MAX;
  447.         }
  448.  
  449.         acpi_os_release_mutex(acpi_gbl_osi_mutex);
  450.  
  451.         /*
  452.          * Invoke an optional _OSI interface handler. The host OS may wish
  453.          * to do some interface-specific handling. For example, warn about
  454.          * certain interfaces or override the true/false support value.
  455.          */
  456.         interface_handler = acpi_gbl_interface_handler;
  457.         if (interface_handler) {
  458.                 return_value =
  459.                     interface_handler(string_desc->string.pointer,
  460.                                       return_value);
  461.         }
  462.  
  463.         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
  464.                               "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
  465.                               string_desc->string.pointer,
  466.                               return_value == 0 ? "not " : ""));
  467.  
  468.         /* Complete the return object */
  469.  
  470.         return_desc->integer.value = return_value;
  471.         walk_state->return_desc = return_desc;
  472.         return_ACPI_STATUS(AE_OK);
  473. }
  474.