drivers/acpi/tables/tbxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxface - Public interfaces to the ACPI subsystem
   4  *                         ACPI table oriented interfaces
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2006, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/actables.h>
  48
  49 #define _COMPONENT          ACPI_TABLES
  50 ACPI_MODULE_NAME("tbxface")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_load_tables
  55  *
  56  * PARAMETERS:  None
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: This function is called to load the ACPI tables from the
  61  *              provided RSDT
  62  *
  63  ******************************************************************************/
  64 acpi_status acpi_load_tables(void)
  65 {
  66         struct acpi_pointer rsdp_address;
  67         acpi_status status;
  68
  69         ACPI_FUNCTION_TRACE(acpi_load_tables);
  70
  71         /* Get the RSDP */
  72
  73         status = acpi_os_get_root_pointer(ACPI_LOGICAL_ADDRESSING,
  74                                           &rsdp_address);
  75         if (ACPI_FAILURE(status)) {
  76                 ACPI_EXCEPTION((AE_INFO, status, "Could not get the RSDP"));
  77                 goto error_exit;
  78         }
  79
  80         /* Map and validate the RSDP */
  81
  82         acpi_gbl_table_flags = rsdp_address.pointer_type;
  83
  84         status = acpi_tb_verify_rsdp(&rsdp_address);
  85         if (ACPI_FAILURE(status)) {
  86                 ACPI_EXCEPTION((AE_INFO, status, "During RSDP validation"));
  87                 goto error_exit;
  88         }
  89
  90         /* Get the RSDT via the RSDP */
  91
  92         status = acpi_tb_get_table_rsdt();
  93         if (ACPI_FAILURE(status)) {
  94                 ACPI_EXCEPTION((AE_INFO, status, "Could not load RSDT"));
  95                 goto error_exit;
  96         }
  97
  98         /* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
  99
 100         status = acpi_tb_get_required_tables();
 101         if (ACPI_FAILURE(status)) {
 102                 ACPI_EXCEPTION((AE_INFO, status,
 103                                 "Could not get all required tables (DSDT/FADT/FACS)"));
 104                 goto error_exit;
 105         }
 106
 107         ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 108
 109         /* Load the namespace from the tables */
 110
 111         status = acpi_ns_load_namespace();
 112         if (ACPI_FAILURE(status)) {
 113                 ACPI_EXCEPTION((AE_INFO, status, "Could not load namespace"));
 114                 goto error_exit;
 115         }
 116
 117         return_ACPI_STATUS(AE_OK);
 118
 119       error_exit:
 120         ACPI_EXCEPTION((AE_INFO, status, "Could not load tables"));
 121         return_ACPI_STATUS(status);
 122 }
 123
 124 ACPI_EXPORT_SYMBOL(acpi_load_tables)
 125
 126 #ifdef ACPI_FUTURE_USAGE
 127 /*******************************************************************************
 128  *
 129  * FUNCTION:    acpi_load_table
 130  *
 131  * PARAMETERS:  table_ptr       - pointer to a buffer containing the entire
 132  *                                table to be loaded
 133  *
 134  * RETURN:      Status
 135  *
 136  * DESCRIPTION: This function is called to load a table from the caller's
 137  *              buffer.  The buffer must contain an entire ACPI Table including
 138  *              a valid header.  The header fields will be verified, and if it
 139  *              is determined that the table is invalid, the call will fail.
 140  *
 141  ******************************************************************************/
 142 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
 143 {
 144         acpi_status status;
 145         struct acpi_table_desc table_info;
 146         struct acpi_pointer address;
 147
 148         ACPI_FUNCTION_TRACE(acpi_load_table);
 149
 150         if (!table_ptr) {
 151                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 152         }
 153
 154         /* Copy the table to a local buffer */
 155
 156         address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
 157         address.pointer.logical = table_ptr;
 158
 159         status = acpi_tb_get_table_body(&address, table_ptr, &table_info);
 160         if (ACPI_FAILURE(status)) {
 161                 return_ACPI_STATUS(status);
 162         }
 163
 164         /* Check signature for a valid table type */
 165
 166         status = acpi_tb_recognize_table(&table_info, ACPI_TABLE_ALL);
 167         if (ACPI_FAILURE(status)) {
 168                 return_ACPI_STATUS(status);
 169         }
 170
 171         /* Install the new table into the local data structures */
 172
 173         status = acpi_tb_install_table(&table_info);
 174         if (ACPI_FAILURE(status)) {
 175                 if (status == AE_ALREADY_EXISTS) {
 176
 177                         /* Table already exists, no error */
 178
 179                         status = AE_OK;
 180                 }
 181
 182                 /* Free table allocated by acpi_tb_get_table_body */
 183
 184                 acpi_tb_delete_single_table(&table_info);
 185                 return_ACPI_STATUS(status);
 186         }
 187
 188         /* Convert the table to common format if necessary */
 189
 190         switch (table_info.type) {
 191         case ACPI_TABLE_ID_FADT:
 192
 193                 status = acpi_tb_convert_table_fadt();
 194                 break;
 195
 196         case ACPI_TABLE_ID_FACS:
 197
 198                 status = acpi_tb_build_common_facs(&table_info);
 199                 break;
 200
 201         default:
 202                 /* Load table into namespace if it contains executable AML */
 203
 204                 status =
 205                     acpi_ns_load_table(table_info.installed_desc,
 206                                        acpi_gbl_root_node);
 207                 break;
 208         }
 209
 210         if (ACPI_FAILURE(status)) {
 211
 212                 /* Uninstall table and free the buffer */
 213
 214                 (void)acpi_tb_uninstall_table(table_info.installed_desc);
 215         }
 216
 217         return_ACPI_STATUS(status);
 218 }
 219
 220 ACPI_EXPORT_SYMBOL(acpi_load_table)
 221
 222 /*******************************************************************************
 223  *
 224  * FUNCTION:    acpi_unload_table
 225  *
 226  * PARAMETERS:  table_type    - Type of table to be unloaded
 227  *
 228  * RETURN:      Status
 229  *
 230  * DESCRIPTION: This routine is used to force the unload of a table
 231  *
 232  ******************************************************************************/
 233 acpi_status acpi_unload_table(acpi_table_type table_type)
 234 {
 235         struct acpi_table_desc *table_desc;
 236
 237         ACPI_FUNCTION_TRACE(acpi_unload_table);
 238
 239         /* Parameter validation */
 240
 241         if (table_type > ACPI_TABLE_ID_MAX) {
 242                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 243         }
 244
 245         /* Find all tables of the requested type */
 246
 247         table_desc = acpi_gbl_table_lists[table_type].next;
 248         while (table_desc) {
 249                 /*
 250                  * Delete all namespace entries owned by this table.  Note that these
 251                  * entries can appear anywhere in the namespace by virtue of the AML
 252                  * "Scope" operator.  Thus, we need to track ownership by an ID, not
 253                  * simply a position within the hierarchy
 254                  */
 255                 acpi_ns_delete_namespace_by_owner(table_desc->owner_id);
 256                 acpi_ut_release_owner_id(&table_desc->owner_id);
 257                 table_desc = table_desc->next;
 258         }
 259
 260         /* Delete (or unmap) all tables of this type */
 261
 262         acpi_tb_delete_tables_by_type(table_type);
 263         return_ACPI_STATUS(AE_OK);
 264 }
 265
 266 ACPI_EXPORT_SYMBOL(acpi_unload_table)
 267
 268 /*******************************************************************************
 269  *
 270  * FUNCTION:    acpi_get_table_header
 271  *
 272  * PARAMETERS:  table_type      - one of the defined table types
 273  *              Instance        - the non zero instance of the table, allows
 274  *                                support for multiple tables of the same type
 275  *                                see acpi_gbl_acpi_table_flag
 276  *              out_table_header - pointer to the struct acpi_table_header if successful
 277  *
 278  * DESCRIPTION: This function is called to get an ACPI table header.  The caller
 279  *              supplies an pointer to a data area sufficient to contain an ACPI
 280  *              struct acpi_table_header structure.
 281  *
 282  *              The header contains a length field that can be used to determine
 283  *              the size of the buffer needed to contain the entire table.  This
 284  *              function is not valid for the RSD PTR table since it does not
 285  *              have a standard header and is fixed length.
 286  *
 287  ******************************************************************************/
 288 acpi_status
 289 acpi_get_table_header(acpi_table_type table_type,
 290                       u32 instance, struct acpi_table_header *out_table_header)
 291 {
 292         struct acpi_table_header *tbl_ptr;
 293         acpi_status status;
 294
 295         ACPI_FUNCTION_TRACE(acpi_get_table_header);
 296
 297         if ((instance == 0) ||
 298             (table_type == ACPI_TABLE_ID_RSDP) || (!out_table_header)) {
 299                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 300         }
 301
 302         /* Check the table type and instance */
 303
 304         if ((table_type > ACPI_TABLE_ID_MAX) ||
 305             (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
 306              instance > 1)) {
 307                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 308         }
 309
 310         /* Get a pointer to the entire table */
 311
 312         status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
 313         if (ACPI_FAILURE(status)) {
 314                 return_ACPI_STATUS(status);
 315         }
 316
 317         /* The function will return a NULL pointer if the table is not loaded */
 318
 319         if (tbl_ptr == NULL) {
 320                 return_ACPI_STATUS(AE_NOT_EXIST);
 321         }
 322
 323         /* Copy the header to the caller's buffer */
 324
 325         ACPI_MEMCPY((void *)out_table_header, (void *)tbl_ptr,
 326                     sizeof(struct acpi_table_header));
 327
 328         return_ACPI_STATUS(status);
 329 }
 330
 331 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 332 #endif                          /*  ACPI_FUTURE_USAGE  */
 333
 334 /*******************************************************************************
 335  *
 336  * FUNCTION:    acpi_get_table
 337  *
 338  * PARAMETERS:  table_type      - one of the defined table types
 339  *              Instance        - the non zero instance of the table, allows
 340  *                                support for multiple tables of the same type
 341  *                                see acpi_gbl_acpi_table_flag
 342  *              ret_buffer      - pointer to a structure containing a buffer to
 343  *                                receive the table
 344  *
 345  * RETURN:      Status
 346  *
 347  * DESCRIPTION: This function is called to get an ACPI table.  The caller
 348  *              supplies an out_buffer large enough to contain the entire ACPI
 349  *              table.  The caller should call the acpi_get_table_header function
 350  *              first to determine the buffer size needed.  Upon completion
 351  *              the out_buffer->Length field will indicate the number of bytes
 352  *              copied into the out_buffer->buf_ptr buffer. This table will be
 353  *              a complete table including the header.
 354  *
 355  ******************************************************************************/
 356 acpi_status
 357 acpi_get_table(acpi_table_type table_type,
 358                u32 instance, struct acpi_buffer *ret_buffer)
 359 {
 360         struct acpi_table_header *tbl_ptr;
 361         acpi_status status;
 362         acpi_size table_length;
 363
 364         ACPI_FUNCTION_TRACE(acpi_get_table);
 365
 366         /* Parameter validation */
 367
 368         if (instance == 0) {
 369                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 370         }
 371
 372         status = acpi_ut_validate_buffer(ret_buffer);
 373         if (ACPI_FAILURE(status)) {
 374                 return_ACPI_STATUS(status);
 375         }
 376
 377         /* Check the table type and instance */
 378
 379         if ((table_type > ACPI_TABLE_ID_MAX) ||
 380             (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
 381              instance > 1)) {
 382                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 383         }
 384
 385         /* Get a pointer to the entire table */
 386
 387         status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
 388         if (ACPI_FAILURE(status)) {
 389                 return_ACPI_STATUS(status);
 390         }
 391
 392         /*
 393          * acpi_tb_get_table_ptr will return a NULL pointer if the
 394          * table is not loaded.
 395          */
 396         if (tbl_ptr == NULL) {
 397                 return_ACPI_STATUS(AE_NOT_EXIST);
 398         }
 399
 400         /* Get the table length */
 401
 402         if (table_type == ACPI_TABLE_ID_RSDP) {
 403
 404                 /* RSD PTR is the only "table" without a header */
 405
 406                 table_length = sizeof(struct rsdp_descriptor);
 407         } else {
 408                 table_length = (acpi_size) tbl_ptr->length;
 409         }
 410
 411         /* Validate/Allocate/Clear caller buffer */
 412
 413         status = acpi_ut_initialize_buffer(ret_buffer, table_length);
 414         if (ACPI_FAILURE(status)) {
 415                 return_ACPI_STATUS(status);
 416         }
 417
 418         /* Copy the table to the buffer */
 419
 420         ACPI_MEMCPY((void *)ret_buffer->pointer, (void *)tbl_ptr, table_length);
 421         return_ACPI_STATUS(AE_OK);
 422 }
 423
 424 ACPI_EXPORT_SYMBOL(acpi_get_table)