1/****************************************************************************** 2 * 3 * Module Name: utosi - Support for the _OSI predefined control method 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2012, 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 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 108acpi_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 141void 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 177acpi_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 219acpi_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 281struct 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 311acpi_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} 381