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 - 2005, 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 <linux/module.h>
  46
  47 #include <acpi/acpi.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/actables.h>
  50
  51
  52 #define _COMPONENT          ACPI_TABLES
  53          ACPI_MODULE_NAME    ("tbxface")
  54
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_load_tables
  59  *
  60  * PARAMETERS:  None
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: This function is called to load the ACPI tables from the
  65  *              provided RSDT
  66  *
  67  ******************************************************************************/
  68
  69 acpi_status
  70 acpi_load_tables (void)
  71 {
  72         struct acpi_pointer             rsdp_address;
  73         acpi_status                     status;
  74
  75
  76         ACPI_FUNCTION_TRACE ("acpi_load_tables");
  77
  78
  79         /* Get the RSDP */
  80
  81         status = acpi_os_get_root_pointer (ACPI_LOGICAL_ADDRESSING,
  82                           &rsdp_address);
  83         if (ACPI_FAILURE (status)) {
  84                 ACPI_REPORT_ERROR (("acpi_load_tables: Could not get RSDP, %s\n",
  85                                   acpi_format_exception (status)));
  86                 goto error_exit;
  87         }
  88
  89         /* Map and validate the RSDP */
  90
  91         acpi_gbl_table_flags = rsdp_address.pointer_type;
  92
  93         status = acpi_tb_verify_rsdp (&rsdp_address);
  94         if (ACPI_FAILURE (status)) {
  95                 ACPI_REPORT_ERROR (("acpi_load_tables: RSDP Failed validation: %s\n",
  96                                   acpi_format_exception (status)));
  97                 goto error_exit;
  98         }
  99
 100         /* Get the RSDT via the RSDP */
 101
 102         status = acpi_tb_get_table_rsdt ();
 103         if (ACPI_FAILURE (status)) {
 104                 ACPI_REPORT_ERROR (("acpi_load_tables: Could not load RSDT: %s\n",
 105                                   acpi_format_exception (status)));
 106                 goto error_exit;
 107         }
 108
 109         /* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
 110
 111         status = acpi_tb_get_required_tables ();
 112         if (ACPI_FAILURE (status)) {
 113                 ACPI_REPORT_ERROR (("acpi_load_tables: Error getting required tables (DSDT/FADT/FACS): %s\n",
 114                                   acpi_format_exception (status)));
 115                 goto error_exit;
 116         }
 117
 118         ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 119
 120
 121         /* Load the namespace from the tables */
 122
 123         status = acpi_ns_load_namespace ();
 124         if (ACPI_FAILURE (status)) {
 125                 ACPI_REPORT_ERROR (("acpi_load_tables: Could not load namespace: %s\n",
 126                                   acpi_format_exception (status)));
 127                 goto error_exit;
 128         }
 129
 130         return_ACPI_STATUS (AE_OK);
 131
 132
 133 error_exit:
 134         ACPI_REPORT_ERROR (("acpi_load_tables: Could not load tables: %s\n",
 135                           acpi_format_exception (status)));
 136
 137         return_ACPI_STATUS (status);
 138 }
 139
 140
 141 #ifdef ACPI_FUTURE_USAGE
 142
 143 /*******************************************************************************
 144  *
 145  * FUNCTION:    acpi_load_table
 146  *
 147  * PARAMETERS:  table_ptr       - pointer to a buffer containing the entire
 148  *                                table to be loaded
 149  *
 150  * RETURN:      Status
 151  *
 152  * DESCRIPTION: This function is called to load a table from the caller's
 153  *              buffer.  The buffer must contain an entire ACPI Table including
 154  *              a valid header.  The header fields will be verified, and if it
 155  *              is determined that the table is invalid, the call will fail.
 156  *
 157  ******************************************************************************/
 158
 159 acpi_status
 160 acpi_load_table (
 161         struct acpi_table_header        *table_ptr)
 162 {
 163         acpi_status                     status;
 164         struct acpi_table_desc          table_info;
 165         struct acpi_pointer             address;
 166
 167
 168         ACPI_FUNCTION_TRACE ("acpi_load_table");
 169
 170
 171         if (!table_ptr) {
 172                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 173         }
 174
 175         /* Copy the table to a local buffer */
 176
 177         address.pointer_type    = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
 178         address.pointer.logical = table_ptr;
 179
 180         status = acpi_tb_get_table_body (&address, table_ptr, &table_info);
 181         if (ACPI_FAILURE (status)) {
 182                 return_ACPI_STATUS (status);
 183         }
 184
 185         /* Install the new table into the local data structures */
 186
 187         status = acpi_tb_install_table (&table_info);
 188         if (ACPI_FAILURE (status)) {
 189                 /* Free table allocated by acpi_tb_get_table_body */
 190
 191                 acpi_tb_delete_single_table (&table_info);
 192                 return_ACPI_STATUS (status);
 193         }
 194
 195         /* Convert the table to common format if necessary */
 196
 197         switch (table_info.type) {
 198         case ACPI_TABLE_FADT:
 199
 200                 status = acpi_tb_convert_table_fadt ();
 201                 break;
 202
 203         case ACPI_TABLE_FACS:
 204
 205                 status = acpi_tb_build_common_facs (&table_info);
 206                 break;
 207
 208         default:
 209                 /* Load table into namespace if it contains executable AML */
 210
 211                 status = acpi_ns_load_table (table_info.installed_desc, acpi_gbl_root_node);
 212                 break;
 213         }
 214
 215         if (ACPI_FAILURE (status)) {
 216                 /* Uninstall table and free the buffer */
 217
 218                 (void) acpi_tb_uninstall_table (table_info.installed_desc);
 219         }
 220
 221         return_ACPI_STATUS (status);
 222 }
 223
 224
 225 /*******************************************************************************
 226  *
 227  * FUNCTION:    acpi_unload_table
 228  *
 229  * PARAMETERS:  table_type    - Type of table to be unloaded
 230  *
 231  * RETURN:      Status
 232  *
 233  * DESCRIPTION: This routine is used to force the unload of a table
 234  *
 235  ******************************************************************************/
 236
 237 acpi_status
 238 acpi_unload_table (
 239         acpi_table_type                 table_type)
 240 {
 241         struct acpi_table_desc          *table_desc;
 242
 243
 244         ACPI_FUNCTION_TRACE ("acpi_unload_table");
 245
 246
 247         /* Parameter validation */
 248
 249         if (table_type > ACPI_TABLE_MAX) {
 250                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 251         }
 252
 253
 254         /* Find all tables of the requested type */
 255
 256         table_desc = acpi_gbl_table_lists[table_type].next;
 257         while (table_desc) {
 258                 /*
 259                  * Delete all namespace entries owned by this table.  Note that these
 260                  * entries can appear anywhere in the namespace by virtue of the AML
 261                  * "Scope" operator.  Thus, we need to track ownership by an ID, not
 262                  * simply a position within the hierarchy
 263                  */
 264                 acpi_ns_delete_namespace_by_owner (table_desc->table_id);
 265
 266                 table_desc = table_desc->next;
 267         }
 268
 269         /* Delete (or unmap) all tables of this type */
 270
 271         acpi_tb_delete_tables_by_type (table_type);
 272         return_ACPI_STATUS (AE_OK);
 273 }
 274
 275
 276 /*******************************************************************************
 277  *
 278  * FUNCTION:    acpi_get_table_header
 279  *
 280  * PARAMETERS:  table_type      - one of the defined table types
 281  *              Instance        - the non zero instance of the table, allows
 282  *                                support for multiple tables of the same type
 283  *                                see acpi_gbl_acpi_table_flag
 284  *              out_table_header - pointer to the struct acpi_table_header if successful
 285  *
 286  * DESCRIPTION: This function is called to get an ACPI table header.  The caller
 287  *              supplies an pointer to a data area sufficient to contain an ACPI
 288  *              struct acpi_table_header structure.
 289  *
 290  *              The header contains a length field that can be used to determine
 291  *              the size of the buffer needed to contain the entire table.  This
 292  *              function is not valid for the RSD PTR table since it does not
 293  *              have a standard header and is fixed length.
 294  *
 295  ******************************************************************************/
 296
 297 acpi_status
 298 acpi_get_table_header (
 299         acpi_table_type                 table_type,
 300         u32                             instance,
 301         struct acpi_table_header        *out_table_header)
 302 {
 303         struct acpi_table_header        *tbl_ptr;
 304         acpi_status                     status;
 305
 306
 307         ACPI_FUNCTION_TRACE ("acpi_get_table_header");
 308
 309
 310         if ((instance == 0)                 ||
 311                 (table_type == ACPI_TABLE_RSDP) ||
 312                 (!out_table_header)) {
 313                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 314         }
 315
 316         /* Check the table type and instance */
 317
 318         if ((table_type > ACPI_TABLE_MAX)   ||
 319                 (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags) &&
 320                  instance > 1)) {
 321                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 322         }
 323
 324
 325         /* Get a pointer to the entire table */
 326
 327         status = acpi_tb_get_table_ptr (table_type, instance, &tbl_ptr);
 328         if (ACPI_FAILURE (status)) {
 329                 return_ACPI_STATUS (status);
 330         }
 331
 332         /*
 333          * The function will return a NULL pointer if the table is not loaded
 334          */
 335         if (tbl_ptr == NULL) {
 336                 return_ACPI_STATUS (AE_NOT_EXIST);
 337         }
 338
 339         /*
 340          * Copy the header to the caller's buffer
 341          */
 342         ACPI_MEMCPY ((void *) out_table_header, (void *) tbl_ptr,
 343                          sizeof (struct acpi_table_header));
 344
 345         return_ACPI_STATUS (status);
 346 }
 347
 348
 349 #endif  /*  ACPI_FUTURE_USAGE  */
 350
 351 /*******************************************************************************
 352  *
 353  * FUNCTION:    acpi_get_table
 354  *
 355  * PARAMETERS:  table_type      - one of the defined table types
 356  *              Instance        - the non zero instance of the table, allows
 357  *                                support for multiple tables of the same type
 358  *                                see acpi_gbl_acpi_table_flag
 359  *              ret_buffer      - pointer to a structure containing a buffer to
 360  *                                receive the table
 361  *
 362  * RETURN:      Status
 363  *
 364  * DESCRIPTION: This function is called to get an ACPI table.  The caller
 365  *              supplies an out_buffer large enough to contain the entire ACPI
 366  *              table.  The caller should call the acpi_get_table_header function
 367  *              first to determine the buffer size needed.  Upon completion
 368  *              the out_buffer->Length field will indicate the number of bytes
 369  *              copied into the out_buffer->buf_ptr buffer. This table will be
 370  *              a complete table including the header.
 371  *
 372  ******************************************************************************/
 373
 374 acpi_status
 375 acpi_get_table (
 376         acpi_table_type                 table_type,
 377         u32                             instance,
 378         struct acpi_buffer              *ret_buffer)
 379 {
 380         struct acpi_table_header        *tbl_ptr;
 381         acpi_status                     status;
 382         acpi_size                       table_length;
 383
 384
 385         ACPI_FUNCTION_TRACE ("acpi_get_table");
 386
 387
 388         /* Parameter validation */
 389
 390         if (instance == 0) {
 391                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 392         }
 393
 394         status = acpi_ut_validate_buffer (ret_buffer);
 395         if (ACPI_FAILURE (status)) {
 396                 return_ACPI_STATUS (status);
 397         }
 398
 399         /* Check the table type and instance */
 400
 401         if ((table_type > ACPI_TABLE_MAX)   ||
 402                 (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags) &&
 403                  instance > 1)) {
 404                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 405         }
 406
 407
 408         /* Get a pointer to the entire table */
 409
 410         status = acpi_tb_get_table_ptr (table_type, instance, &tbl_ptr);
 411         if (ACPI_FAILURE (status)) {
 412                 return_ACPI_STATUS (status);
 413         }
 414
 415         /*
 416          * acpi_tb_get_table_ptr will return a NULL pointer if the
 417          * table is not loaded.
 418          */
 419         if (tbl_ptr == NULL) {
 420                 return_ACPI_STATUS (AE_NOT_EXIST);
 421         }
 422
 423         /* Get the table length */
 424
 425         if (table_type == ACPI_TABLE_RSDP) {
 426                 /*
 427                  *  RSD PTR is the only "table" without a header
 428                  */
 429                 table_length = sizeof (struct rsdp_descriptor);
 430         }
 431         else {
 432                 table_length = (acpi_size) tbl_ptr->length;
 433         }
 434
 435         /* Validate/Allocate/Clear caller buffer */
 436
 437         status = acpi_ut_initialize_buffer (ret_buffer, table_length);
 438         if (ACPI_FAILURE (status)) {
 439                 return_ACPI_STATUS (status);
 440         }
 441
 442         /* Copy the table to the buffer */
 443
 444         ACPI_MEMCPY ((void *) ret_buffer->pointer, (void *) tbl_ptr, table_length);
 445         return_ACPI_STATUS (AE_OK);
 446 }
 447 EXPORT_SYMBOL(acpi_get_table);
 448