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 <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_EXCEPTION((AE_INFO, status, "Could not get the RSDP"));
  79                 goto error_exit;
  80         }
  81
  82         /* Map and validate the RSDP */
  83
  84         acpi_gbl_table_flags = rsdp_address.pointer_type;
  85
  86         status = acpi_tb_verify_rsdp(&rsdp_address);
  87         if (ACPI_FAILURE(status)) {
  88                 ACPI_EXCEPTION((AE_INFO, status, "During RSDP validation"));
  89                 goto error_exit;
  90         }
  91
  92         /* Get the RSDT via the RSDP */
  93
  94         status = acpi_tb_get_table_rsdt();
  95         if (ACPI_FAILURE(status)) {
  96                 ACPI_EXCEPTION((AE_INFO, status, "Could not load RSDT"));
  97                 goto error_exit;
  98         }
  99
 100         /* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
 101
 102         status = acpi_tb_get_required_tables();
 103         if (ACPI_FAILURE(status)) {
 104                 ACPI_EXCEPTION((AE_INFO, status,
 105                                 "Could not get all required tables (DSDT/FADT/FACS)"));
 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_EXCEPTION((AE_INFO, status, "Could not load namespace"));
 116                 goto error_exit;
 117         }
 118
 119         return_ACPI_STATUS(AE_OK);
 120
 121       error_exit:
 122         ACPI_EXCEPTION((AE_INFO, status, "Could not load tables"));
 123         return_ACPI_STATUS(status);
 124 }
 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
 143 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
 144 {
 145         acpi_status status;
 146         struct acpi_table_desc table_info;
 147         struct acpi_pointer address;
 148
 149         ACPI_FUNCTION_TRACE("acpi_load_table");
 150
 151         if (!table_ptr) {
 152                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 153         }
 154
 155         /* Copy the table to a local buffer */
 156
 157         address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
 158         address.pointer.logical = table_ptr;
 159
 160         status = acpi_tb_get_table_body(&address, table_ptr, &table_info);
 161         if (ACPI_FAILURE(status)) {
 162                 return_ACPI_STATUS(status);
 163         }
 164
 165         /* Check signature for a valid table type */
 166
 167         status = acpi_tb_recognize_table(&table_info, ACPI_TABLE_ALL);
 168         if (ACPI_FAILURE(status)) {
 169                 return_ACPI_STATUS(status);
 170         }
 171
 172         /* Install the new table into the local data structures */
 173
 174         status = acpi_tb_install_table(&table_info);
 175         if (ACPI_FAILURE(status)) {
 176                 if (status == AE_ALREADY_EXISTS) {
 177
 178                         /* Table already exists, no error */
 179
 180                         status = AE_OK;
 181                 }
 182
 183                 /* Free table allocated by acpi_tb_get_table_body */
 184
 185                 acpi_tb_delete_single_table(&table_info);
 186                 return_ACPI_STATUS(status);
 187         }
 188
 189         /* Convert the table to common format if necessary */
 190
 191         switch (table_info.type) {
 192         case ACPI_TABLE_FADT:
 193
 194                 status = acpi_tb_convert_table_fadt();
 195                 break;
 196
 197         case ACPI_TABLE_FACS:
 198
 199                 status = acpi_tb_build_common_facs(&table_info);
 200                 break;
 201
 202         default:
 203                 /* Load table into namespace if it contains executable AML */
 204
 205                 status =
 206                     acpi_ns_load_table(table_info.installed_desc,
 207                                        acpi_gbl_root_node);
 208                 break;
 209         }
 210
 211         if (ACPI_FAILURE(status)) {
 212
 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
 403                 /* RSD PTR is the only "table" without a header */
 404
 405                 table_length = sizeof(struct rsdp_descriptor);
 406         } else {
 407                 table_length = (acpi_size) tbl_ptr->length;
 408         }
 409
 410         /* Validate/Allocate/Clear caller buffer */
 411
 412         status = acpi_ut_initialize_buffer(ret_buffer, table_length);
 413         if (ACPI_FAILURE(status)) {
 414                 return_ACPI_STATUS(status);
 415         }
 416
 417         /* Copy the table to the buffer */
 418
 419         ACPI_MEMCPY((void *)ret_buffer->pointer, (void *)tbl_ptr, table_length);
 420         return_ACPI_STATUS(AE_OK);
 421 }
 422
 423 EXPORT_SYMBOL(acpi_get_table);