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