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 - 2011, 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
  77         /* Feature Group Strings */
  78
  79         {"Extended Address Space Descriptor", NULL, 0, 0}
  80
  81         /*
  82          * All "optional" feature group strings (features that are implemented
  83          * by the host) should be dynamically added by the host via
  84          * acpi_install_interface and should not be manually added here.
  85          *
  86          * Examples of optional feature group strings:
  87          *
  88          * "Module Device"
  89          * "Processor Device"
  90          * "3.0 Thermal Model"
  91          * "3.0 _SCP Extensions"
  92          * "Processor Aggregator Device"
  93          */
  94 };
  95
  96 /*******************************************************************************
  97  *
  98  * FUNCTION:    acpi_ut_initialize_interfaces
  99  *
 100  * PARAMETERS:  None
 101  *
 102  * RETURN:      Status
 103  *
 104  * DESCRIPTION: Initialize the global _OSI supported interfaces list
 105  *
 106  ******************************************************************************/
 107
 108 acpi_status acpi_ut_initialize_interfaces(void)
 109 {
 110         u32 i;
 111
 112         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 113         acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
 114
 115         /* Link the static list of supported interfaces */
 116
 117         for (i = 0;
 118              i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
 119              i++) {
 120                 acpi_default_supported_interfaces[i].next =
 121                     &acpi_default_supported_interfaces[(acpi_size) i + 1];
 122         }
 123
 124         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 125         return (AE_OK);
 126 }
 127
 128 /*******************************************************************************
 129  *
 130  * FUNCTION:    acpi_ut_interface_terminate
 131  *
 132  * PARAMETERS:  None
 133  *
 134  * RETURN:      None
 135  *
 136  * DESCRIPTION: Delete all interfaces in the global list. Sets
 137  *              acpi_gbl_supported_interfaces to NULL.
 138  *
 139  ******************************************************************************/
 140
 141 void acpi_ut_interface_terminate(void)
 142 {
 143         struct acpi_interface_info *next_interface;
 144
 145         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 146         next_interface = acpi_gbl_supported_interfaces;
 147
 148         while (next_interface) {
 149                 acpi_gbl_supported_interfaces = next_interface->next;
 150
 151                 /* Only interfaces added at runtime can be freed */
 152
 153                 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 154                         ACPI_FREE(next_interface->name);
 155                         ACPI_FREE(next_interface);
 156                 }
 157
 158                 next_interface = acpi_gbl_supported_interfaces;
 159         }
 160
 161         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 162 }
 163
 164 /*******************************************************************************
 165  *
 166  * FUNCTION:    acpi_ut_install_interface
 167  *
 168  * PARAMETERS:  interface_name      - The interface to install
 169  *
 170  * RETURN:      Status
 171  *
 172  * DESCRIPTION: Install the interface into the global interface list.
 173  *              Caller MUST hold acpi_gbl_osi_mutex
 174  *
 175  ******************************************************************************/
 176
 177 acpi_status acpi_ut_install_interface(acpi_string interface_name)
 178 {
 179         struct acpi_interface_info *interface_info;
 180
 181         /* Allocate info block and space for the name string */
 182
 183         interface_info =
 184             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
 185         if (!interface_info) {
 186                 return (AE_NO_MEMORY);
 187         }
 188
 189         interface_info->name =
 190             ACPI_ALLOCATE_ZEROED(ACPI_STRLEN(interface_name) + 1);
 191         if (!interface_info->name) {
 192                 ACPI_FREE(interface_info);
 193                 return (AE_NO_MEMORY);
 194         }
 195
 196         /* Initialize new info and insert at the head of the global list */
 197
 198         ACPI_STRCPY(interface_info->name, interface_name);
 199         interface_info->flags = ACPI_OSI_DYNAMIC;
 200         interface_info->next = acpi_gbl_supported_interfaces;
 201
 202         acpi_gbl_supported_interfaces = interface_info;
 203         return (AE_OK);
 204 }
 205
 206 /*******************************************************************************
 207  *
 208  * FUNCTION:    acpi_ut_remove_interface
 209  *
 210  * PARAMETERS:  interface_name      - The interface to remove
 211  *
 212  * RETURN:      Status
 213  *
 214  * DESCRIPTION: Remove the interface from the global interface list.
 215  *              Caller MUST hold acpi_gbl_osi_mutex
 216  *
 217  ******************************************************************************/
 218
 219 acpi_status acpi_ut_remove_interface(acpi_string interface_name)
 220 {
 221         struct acpi_interface_info *previous_interface;
 222         struct acpi_interface_info *next_interface;
 223
 224         previous_interface = next_interface = acpi_gbl_supported_interfaces;
 225         while (next_interface) {
 226                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 227
 228                         /* Found: name is in either the static list or was added at runtime */
 229
 230                         if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 231
 232                                 /* Interface was added dynamically, remove and free it */
 233
 234                                 if (previous_interface == next_interface) {
 235                                         acpi_gbl_supported_interfaces =
 236                                             next_interface->next;
 237                                 } else {
 238                                         previous_interface->next =
 239                                             next_interface->next;
 240                                 }
 241
 242                                 ACPI_FREE(next_interface->name);
 243                                 ACPI_FREE(next_interface);
 244                         } else {
 245                                 /*
 246                                  * Interface is in static list. If marked invalid, then it
 247                                  * does not actually exist. Else, mark it invalid.
 248                                  */
 249                                 if (next_interface->flags & ACPI_OSI_INVALID) {
 250                                         return (AE_NOT_EXIST);
 251                                 }
 252
 253                                 next_interface->flags |= ACPI_OSI_INVALID;
 254                         }
 255
 256                         return (AE_OK);
 257                 }
 258
 259                 previous_interface = next_interface;
 260                 next_interface = next_interface->next;
 261         }
 262
 263         /* Interface was not found */
 264
 265         return (AE_NOT_EXIST);
 266 }
 267
 268 /*******************************************************************************
 269  *
 270  * FUNCTION:    acpi_ut_get_interface
 271  *
 272  * PARAMETERS:  interface_name      - The interface to find
 273  *
 274  * RETURN:      struct acpi_interface_info if found. NULL if not found.
 275  *
 276  * DESCRIPTION: Search for the specified interface name in the global list.
 277  *              Caller MUST hold acpi_gbl_osi_mutex
 278  *
 279  ******************************************************************************/
 280
 281 struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
 282 {
 283         struct acpi_interface_info *next_interface;
 284
 285         next_interface = acpi_gbl_supported_interfaces;
 286         while (next_interface) {
 287                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 288                         return (next_interface);
 289                 }
 290
 291                 next_interface = next_interface->next;
 292         }
 293
 294         return (NULL);
 295 }
 296
 297 /*******************************************************************************
 298  *
 299  * FUNCTION:    acpi_ut_osi_implementation
 300  *
 301  * PARAMETERS:  walk_state          - Current walk state
 302  *
 303  * RETURN:      Status
 304  *
 305  * DESCRIPTION: Implementation of the _OSI predefined control method. When
 306  *              an invocation of _OSI is encountered in the system AML,
 307  *              control is transferred to this function.
 308  *
 309  ******************************************************************************/
 310
 311 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
 312 {
 313         union acpi_operand_object *string_desc;
 314         union acpi_operand_object *return_desc;
 315         struct acpi_interface_info *interface_info;
 316         acpi_interface_handler interface_handler;
 317         u32 return_value;
 318
 319         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 320
 321         /* Validate the string input argument (from the AML caller) */
 322
 323         string_desc = walk_state->arguments[0].object;
 324         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 325                 return_ACPI_STATUS(AE_TYPE);
 326         }
 327
 328         /* Create a return object */
 329
 330         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 331         if (!return_desc) {
 332                 return_ACPI_STATUS(AE_NO_MEMORY);
 333         }
 334
 335         /* Default return value is 0, NOT SUPPORTED */
 336
 337         return_value = 0;
 338         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 339
 340         /* Lookup the interface in the global _OSI list */
 341
 342         interface_info = acpi_ut_get_interface(string_desc->string.pointer);
 343         if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
 344                 /*
 345                  * The interface is supported.
 346                  * Update the osi_data if necessary. We keep track of the latest
 347                  * version of Windows that has been requested by the BIOS.
 348                  */
 349                 if (interface_info->value > acpi_gbl_osi_data) {
 350                         acpi_gbl_osi_data = interface_info->value;
 351                 }
 352
 353                 return_value = ACPI_UINT32_MAX;
 354         }
 355
 356         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 357
 358         /*
 359          * Invoke an optional _OSI interface handler. The host OS may wish
 360          * to do some interface-specific handling. For example, warn about
 361          * certain interfaces or override the true/false support value.
 362          */
 363         interface_handler = acpi_gbl_interface_handler;
 364         if (interface_handler) {
 365                 return_value =
 366                     interface_handler(string_desc->string.pointer,
 367                                       return_value);
 368         }
 369
 370         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 371                               "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
 372                               string_desc->string.pointer,
 373                               return_value == 0 ? "not " : ""));
 374
 375         /* Complete the return object */
 376
 377         return_desc->integer.value = return_value;
 378         walk_state->return_desc = return_desc;
 379         return_ACPI_STATUS(AE_OK);
 380 }