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         u32 i;
 112
 113         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 114         acpi_gbl_supported_interfaces = acpi_default_supported_interfaces;
 115
 116         /* Link the static list of supported interfaces */
 117
 118         for (i = 0;
 119              i < (ACPI_ARRAY_LENGTH(acpi_default_supported_interfaces) - 1);
 120              i++) {
 121                 acpi_default_supported_interfaces[i].next =
 122                     &acpi_default_supported_interfaces[(acpi_size) i + 1];
 123         }
 124
 125         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 126         return (AE_OK);
 127 }
 128
 129 /*******************************************************************************
 130  *
 131  * FUNCTION:    acpi_ut_interface_terminate
 132  *
 133  * PARAMETERS:  None
 134  *
 135  * RETURN:      None
 136  *
 137  * DESCRIPTION: Delete all interfaces in the global list. Sets
 138  *              acpi_gbl_supported_interfaces to NULL.
 139  *
 140  ******************************************************************************/
 141
 142 void acpi_ut_interface_terminate(void)
 143 {
 144         struct acpi_interface_info *next_interface;
 145
 146         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 147         next_interface = acpi_gbl_supported_interfaces;
 148
 149         while (next_interface) {
 150                 acpi_gbl_supported_interfaces = next_interface->next;
 151
 152                 /* Only interfaces added at runtime can be freed */
 153
 154                 if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 155                         ACPI_FREE(next_interface->name);
 156                         ACPI_FREE(next_interface);
 157                 }
 158
 159                 next_interface = acpi_gbl_supported_interfaces;
 160         }
 161
 162         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 163 }
 164
 165 /*******************************************************************************
 166  *
 167  * FUNCTION:    acpi_ut_install_interface
 168  *
 169  * PARAMETERS:  interface_name      - The interface to install
 170  *
 171  * RETURN:      Status
 172  *
 173  * DESCRIPTION: Install the interface into the global interface list.
 174  *              Caller MUST hold acpi_gbl_osi_mutex
 175  *
 176  ******************************************************************************/
 177
 178 acpi_status acpi_ut_install_interface(acpi_string interface_name)
 179 {
 180         struct acpi_interface_info *interface_info;
 181
 182         /* Allocate info block and space for the name string */
 183
 184         interface_info =
 185             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_interface_info));
 186         if (!interface_info) {
 187                 return (AE_NO_MEMORY);
 188         }
 189
 190         interface_info->name =
 191             ACPI_ALLOCATE_ZEROED(ACPI_STRLEN(interface_name) + 1);
 192         if (!interface_info->name) {
 193                 ACPI_FREE(interface_info);
 194                 return (AE_NO_MEMORY);
 195         }
 196
 197         /* Initialize new info and insert at the head of the global list */
 198
 199         ACPI_STRCPY(interface_info->name, interface_name);
 200         interface_info->flags = ACPI_OSI_DYNAMIC;
 201         interface_info->next = acpi_gbl_supported_interfaces;
 202
 203         acpi_gbl_supported_interfaces = interface_info;
 204         return (AE_OK);
 205 }
 206
 207 /*******************************************************************************
 208  *
 209  * FUNCTION:    acpi_ut_remove_interface
 210  *
 211  * PARAMETERS:  interface_name      - The interface to remove
 212  *
 213  * RETURN:      Status
 214  *
 215  * DESCRIPTION: Remove the interface from the global interface list.
 216  *              Caller MUST hold acpi_gbl_osi_mutex
 217  *
 218  ******************************************************************************/
 219
 220 acpi_status acpi_ut_remove_interface(acpi_string interface_name)
 221 {
 222         struct acpi_interface_info *previous_interface;
 223         struct acpi_interface_info *next_interface;
 224
 225         previous_interface = next_interface = acpi_gbl_supported_interfaces;
 226         while (next_interface) {
 227                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 228
 229                         /* Found: name is in either the static list or was added at runtime */
 230
 231                         if (next_interface->flags & ACPI_OSI_DYNAMIC) {
 232
 233                                 /* Interface was added dynamically, remove and free it */
 234
 235                                 if (previous_interface == next_interface) {
 236                                         acpi_gbl_supported_interfaces =
 237                                             next_interface->next;
 238                                 } else {
 239                                         previous_interface->next =
 240                                             next_interface->next;
 241                                 }
 242
 243                                 ACPI_FREE(next_interface->name);
 244                                 ACPI_FREE(next_interface);
 245                         } else {
 246                                 /*
 247                                  * Interface is in static list. If marked invalid, then it
 248                                  * does not actually exist. Else, mark it invalid.
 249                                  */
 250                                 if (next_interface->flags & ACPI_OSI_INVALID) {
 251                                         return (AE_NOT_EXIST);
 252                                 }
 253
 254                                 next_interface->flags |= ACPI_OSI_INVALID;
 255                         }
 256
 257                         return (AE_OK);
 258                 }
 259
 260                 previous_interface = next_interface;
 261                 next_interface = next_interface->next;
 262         }
 263
 264         /* Interface was not found */
 265
 266         return (AE_NOT_EXIST);
 267 }
 268
 269 /*******************************************************************************
 270  *
 271  * FUNCTION:    acpi_ut_get_interface
 272  *
 273  * PARAMETERS:  interface_name      - The interface to find
 274  *
 275  * RETURN:      struct acpi_interface_info if found. NULL if not found.
 276  *
 277  * DESCRIPTION: Search for the specified interface name in the global list.
 278  *              Caller MUST hold acpi_gbl_osi_mutex
 279  *
 280  ******************************************************************************/
 281
 282 struct acpi_interface_info *acpi_ut_get_interface(acpi_string interface_name)
 283 {
 284         struct acpi_interface_info *next_interface;
 285
 286         next_interface = acpi_gbl_supported_interfaces;
 287         while (next_interface) {
 288                 if (!ACPI_STRCMP(interface_name, next_interface->name)) {
 289                         return (next_interface);
 290                 }
 291
 292                 next_interface = next_interface->next;
 293         }
 294
 295         return (NULL);
 296 }
 297
 298 /*******************************************************************************
 299  *
 300  * FUNCTION:    acpi_ut_osi_implementation
 301  *
 302  * PARAMETERS:  walk_state          - Current walk state
 303  *
 304  * RETURN:      Status
 305  *
 306  * DESCRIPTION: Implementation of the _OSI predefined control method. When
 307  *              an invocation of _OSI is encountered in the system AML,
 308  *              control is transferred to this function.
 309  *
 310  ******************************************************************************/
 311
 312 acpi_status acpi_ut_osi_implementation(struct acpi_walk_state * walk_state)
 313 {
 314         union acpi_operand_object *string_desc;
 315         union acpi_operand_object *return_desc;
 316         struct acpi_interface_info *interface_info;
 317         acpi_interface_handler interface_handler;
 318         u32 return_value;
 319
 320         ACPI_FUNCTION_TRACE(ut_osi_implementation);
 321
 322         /* Validate the string input argument (from the AML caller) */
 323
 324         string_desc = walk_state->arguments[0].object;
 325         if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
 326                 return_ACPI_STATUS(AE_TYPE);
 327         }
 328
 329         /* Create a return object */
 330
 331         return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 332         if (!return_desc) {
 333                 return_ACPI_STATUS(AE_NO_MEMORY);
 334         }
 335
 336         /* Default return value is 0, NOT SUPPORTED */
 337
 338         return_value = 0;
 339         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
 340
 341         /* Lookup the interface in the global _OSI list */
 342
 343         interface_info = acpi_ut_get_interface(string_desc->string.pointer);
 344         if (interface_info && !(interface_info->flags & ACPI_OSI_INVALID)) {
 345                 /*
 346                  * The interface is supported.
 347                  * Update the osi_data if necessary. We keep track of the latest
 348                  * version of Windows that has been requested by the BIOS.
 349                  */
 350                 if (interface_info->value > acpi_gbl_osi_data) {
 351                         acpi_gbl_osi_data = interface_info->value;
 352                 }
 353
 354                 return_value = ACPI_UINT32_MAX;
 355         }
 356
 357         acpi_os_release_mutex(acpi_gbl_osi_mutex);
 358
 359         /*
 360          * Invoke an optional _OSI interface handler. The host OS may wish
 361          * to do some interface-specific handling. For example, warn about
 362          * certain interfaces or override the true/false support value.
 363          */
 364         interface_handler = acpi_gbl_interface_handler;
 365         if (interface_handler) {
 366                 return_value =
 367                     interface_handler(string_desc->string.pointer,
 368                                       return_value);
 369         }
 370
 371         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
 372                               "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
 373                               string_desc->string.pointer,
 374                               return_value == 0 ? "not " : ""));
 375
 376         /* Complete the return object */
 377
 378         return_desc->integer.value = return_value;
 379         walk_state->return_desc = return_desc;
 380         return_ACPI_STATUS(AE_OK);
 381 }