utosi.c revision 388a9902074c3cfe57d2425d766c491d072d2948
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 48ACPI_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 */ 62static 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 109acpi_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 147acpi_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 188acpi_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 230acpi_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 292struct 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 322acpi_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} 396