Pileus Git - ~andy/linux/blob - drivers/acpi/acpica/utosi.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utosi - Support for the _OSI predefined control method
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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  * Strings supported by the _OSI predefined control method (which is
  52  * implemented internally within this module.)
  53  *
  54  * March 2009: Removed "Linux" as this host no longer wants to respond true
  55  * for this string. Basically, the only safe OS strings are windows-related
  56  * and in many or most cases represent the only test path within the
  57  * BIOS-provided ASL code.
  58  *
  59  * The last element of each entry is used to track the newest version of
  60  * Windows that the BIOS has requested.
  61  */
  62 static struct acpi_interface_info acpi_default_supported_interfaces[] = {
  63         /* Operating System Vendor Strings */
  64
  65         {"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000},   /* Windows 2000 */
  66         {"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP},     /* Windows XP */
  67         {"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1},     /* Windows XP SP1 */
  68         {"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003},      /* Windows Server 2003 */
  69         {"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2},     /* Windows XP SP2 */
  70         {"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1},      /* Windows Server 2003 SP1 - Added 03/2006 */
  71         {"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA},  /* Windows vista - Added 03/2006 */
  72         {"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008},      /* Windows Server 2008 - Added 09/2009 */
  73         {"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1},  /* Windows Vista SP1 - Added 09/2009 */
  74         {"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2},  /* Windows Vista SP2 - Added 09/2010 */
  75         {"Windows 2009", NULL, 0, ACPI_OSI_WIN_7},      /* Windows 7 and Server 2008 R2 - Added 09/2009 */
  76         {"Windows 2012", NULL, 0, ACPI_OSI_WIN_8},      /* Windows 8 and Server 2012 - Added 08/2012 */
  77
  78         /* Feature Group Strings */
  79
  80         {"Extended Address Space Descriptor", NULL, 0, 0}
  81
  82         /*
  83          * All "optional" feature group strings (features that are implemented
  84          * by the host) should be dynamically added by the host via
  85          * acpi_install_interface and should not be manually added here.
  86          *
  87          * Examples of optional feature group strings:
  88          *
  89          * "Module Device"
  90          * "Processor Device"
  91          * "3.0 Thermal Model"
  92          * "3.0 _SCP Extensions"
  93          * "Processor Aggregator Device"
  94          */
  95 };
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_ut_initialize_interfaces
 100  *
 101  * PARAMETERS:  None
 102  *
 103  * RETURN:      Status
 104  *
 105  * DESCRIPTION: Initialize the global _OSI supported interfaces list
 106  *
 107  ******************************************************************************/
 108
 109 acpi_status acpi_ut_initialize_interfaces(void)
 110 {
 111         acpi_status status;
 112         u32 i;
 113
 114         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 115         if (ACPI_FAILURE(status)) {
 116                 return (status);
 117         }
 118
 119         acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
 120
 121         /* Link the static list of supported interfaces */
 122
 123         for (i = 0;
 124              i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
 125              i++) {
 126                 acpi_default_supported_interfaces[i].next =
 127                     &acpi_default_supported_interfaces[(acpi_size) i + 1];
 128         }
 129
 130         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 131         return (AE_OK);
 132 }
 133
 134 /*******************************************************************************
 135  *
 136  * FUNCTION:    acpi_ut_interface_terminate
 137  *
 138  * PARAMETERS:  None
 139  *
 140  * RETURN:      Status
 141  *
 142  * DESCRIPTION: Delete all interfaces in the global list. Sets
 143  *              acpi_gbl_supported_interfaces to NULL.
 144  *
 145  ******************************************************************************/
 146
 147 acpi_status acpi_ut_interface_terminate(void)
 148 {
 149         acpi_status status;
 150         struct acpi_interface_info *next_interface;
 151
 152         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 153         if (ACPI_FAILURE(status)) {
 154                 return (status);
 155         }
 156
 157         next_interface = acpi_gbl_supported_interfaces;
 158         while (next_interface) {
 159                 acpi_gbl_supported_interfaces = next_interface->next;
 160
 161                 /* Only interfaces added at runtime can be freed */
 162
 163                 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 164                         ACPI_FREE(next_interface->name);
 165                         ACPI_FREE(next_interface);
 166                 }
 167
 168                 next_interface = acpi_gbl_supported_interfaces;
 169         }
 170
 171         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 172         return (AE_OK);
 173 }
 174
 175 /*******************************************************************************
 176  *
 177  * FUNCTION:    acpi_ut_install_interface
 178  *
 179  * PARAMETERS:  interface_name      - The interface to install
 180  *
 181  * RETURN:      Status
 182  *
 183  * DESCRIPTION: Install the interface into the global interface list.
 184  *              Caller MUST hold acpi_gbl_osi_mutex
 185  *
 186  ******************************************************************************/
 187
 188 acpi_status acpi_ut_install_interface(acpi_string interface_name)
 189 {
 190         struct acpi_interface_info *interface_info;
 191
 192         /* Allocate info block and space for the name string */
 193
 194         interface_info =
 195             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
 196         if (!interface_info) {
 197                 return (AE_NO_MEMORY);
 198         }
 199
 200         interface_info->name =
 201             ACPI_ALLOCATE_ZEROED(ACPI_STRLEN(interface_name) + 1);
 202         if (!interface_info->name) {
 203                 ACPI_FREE(interface_info);
 204                 return (AE_NO_MEMORY);
 205         }
 206
 207         /* Initialize new info and insert at the head of the global list */
 208
 209         ACPI_STRCPY(interface_info->name, interface_name);
 210         interface_info->flags = ACPI_OSI_DYNAMIC;
 211         interface_info->next = acpi_gbl_supported_interfaces;
 212
 213         acpi_gbl_supported_interfaces = interface_info;
 214         return (AE_OK);
 215 }
 216
 217 /*******************************************************************************
 218  *
 219  * FUNCTION:    acpi_ut_remove_interface
 220  *
 221  * PARAMETERS:  interface_name      - The interface to remove
 222  *
 223  * RETURN:      Status
 224  *
 225  * DESCRIPTION: Remove the interface from the global interface list.
 226  *              Caller MUST hold acpi_gbl_osi_mutex
 227  *
 228  ******************************************************************************/
 229
 230 acpi_status acpi_ut_remove_interface(acpi_string interface_name)
 231 {
 232         struct acpi_interface_info *previous_interface;
 233         struct acpi_interface_info *next_interface;
 234
 235         previous_interface = next_interface = acpi_gbl_supported_interfaces;
 236         while (next_interface) {
 237                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 238
 239                         /* Found: name is in either the static list or was added at runtime */
 240
 241                         if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 242
 243                                 /* Interface was added dynamically, remove and free it */
 244
 245                                 if (previous_interface == next_interface) {
 246                                         acpi_gbl_supported_interfaces =
 247                                             next_interface->next;
 248                                 } else {
 249                                         previous_interface->next =
 250                                             next_interface->next;
 251                                 }
 252
 253                                 ACPI_FREE(next_interface->name);
 254                                 ACPI_FREE(next_interface);
 255                         } else {
 256                                 /*
 257                                  * Interface is in static list. If marked invalid, then it
 258                                  * does not actually exist. Else, mark it invalid.
 259                                  */
 260                                 if (next_interface->flags & ACPI_OSI_INVALID) {
 261                                         return (AE_NOT_EXIST);
 262                                 }
 263
 264                                 next_interface->flags |= ACPI_OSI_INVALID;
 265                         }
 266
 267                         return (AE_OK);
 268                 }
 269
 270                 previous_interface = next_interface;
 271                 next_interface = next_interface->next;
 272         }
 273
 274         /* Interface was not found */
 275
 276         return (AE_NOT_EXIST);
 277 }
 278
 279 /*******************************************************************************
 280  *
 281  * FUNCTION:    acpi_ut_get_interface
 282  *
 283  * PARAMETERS:  interface_name      - The interface to find
 284  *
 285  * RETURN:      struct acpi_interface_info if found. NULL if not found.
 286  *
 287  * DESCRIPTION: Search for the specified interface name in the global list.
 288  *              Caller MUST hold acpi_gbl_osi_mutex
 289  *
 290  ******************************************************************************/
 291
 292 struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
 293 {
 294         struct acpi_interface_info *next_interface;
 295
 296         next_interface = acpi_gbl_supported_interfaces;
 297         while (next_interface) {
 298                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 299                         return (next_interface);
 300                 }
 301
 302                 next_interface = next_interface->next;
 303         }
 304
 305         return (NULL);
 306 }
 307
 308 /*******************************************************************************
 309  *
 310  * FUNCTION:    acpi_ut_osi_implementation
 311  *
 312  * PARAMETERS:  walk_state          - Current walk state
 313  *
 314  * RETURN:      Status
 315  *
 316  * DESCRIPTION: Implementation of the _OSI predefined control method. When
 317  *              an invocation of _OSI is encountered in the system AML,
 318  *              control is transferred to this function.
 319  *
 320  ******************************************************************************/
 321
 322 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
 323 {
 324         union acpi_operand_object *string_desc;
 325         union acpi_operand_object *return_desc;
 326         struct acpi_interface_info *interface_info;
 327         acpi_interface_handler interface_handler;
 328         acpi_status status;
 329         u32 return_value;
 330
 331         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 332
 333         /* Validate the string input argument (from the AML caller) */
 334
 335         string_desc = walk_state->arguments[0].object;
 336         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 337                 return_ACPI_STATUS(AE_TYPE);
 338         }
 339
 340         /* Create a return object */
 341
 342         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 343         if (!return_desc) {
 344                 return_ACPI_STATUS(AE_NO_MEMORY);
 345         }
 346
 347         /* Default return value is 0, NOT SUPPORTED */
 348
 349         return_value = 0;
 350         status = acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 351         if (ACPI_FAILURE(status)) {
 352                 return (status);
 353         }
 354
 355         /* Lookup the interface in the global _OSI list */
 356
 357         interface_info = acpi_ut_get_interface(string_desc->string.pointer);
 358         if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
 359                 /*
 360                  * The interface is supported.
 361                  * Update the osi_data if necessary. We keep track of the latest
 362                  * version of Windows that has been requested by the BIOS.
 363                  */
 364                 if (interface_info->value > acpi_gbl_osi_data) {
 365                         acpi_gbl_osi_data = interface_info->value;
 366                 }
 367
 368                 return_value = ACPI_UINT32_MAX;
 369         }
 370
 371         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 372
 373         /*
 374          * Invoke an optional _OSI interface handler. The host OS may wish
 375          * to do some interface-specific handling. For example, warn about
 376          * certain interfaces or override the true/false support value.
 377          */
 378         interface_handler = acpi_gbl_interface_handler;
 379         if (interface_handler) {
 380                 return_value =
 381                     interface_handler(string_desc->string.pointer,
 382                                       return_value);
 383         }
 384
 385         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 386                               "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
 387                               string_desc->string.pointer,
 388                               return_value == 0 ? "not " : ""));
 389
 390         /* Complete the return object */
 391
 392         return_desc->integer.value = return_value;
 393         walk_state->return_desc = return_desc;
 394         return_ACPI_STATUS(AE_OK);
 395 }