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 - 2004, 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
  46 #include <acpi/acpi.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/actables.h>
  49
  50
  51 #define _COMPONENT          ACPI_TABLES
  52          ACPI_MODULE_NAME    ("tbxface")
  53
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_load_tables
  58  *
  59  * PARAMETERS:  None
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: This function is called to load the ACPI tables from the
  64  *              provided RSDT
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status
  69 acpi_load_tables (void)
  70 {
  71         struct acpi_pointer             rsdp_address;
  72         acpi_status                     status;
  73
  74
  75         ACPI_FUNCTION_TRACE ("acpi_load_tables");
  76
  77
  78         /* Get the RSDP */
  79
  80         status = acpi_os_get_root_pointer (ACPI_LOGICAL_ADDRESSING,
  81                           &rsdp_address);
  82         if (ACPI_FAILURE (status)) {
  83                 ACPI_REPORT_ERROR (("acpi_load_tables: Could not get RSDP, %s\n",
  84                                   acpi_format_exception (status)));
  85                 goto error_exit;
  86         }
  87
  88         /* Map and validate the RSDP */
  89
  90         acpi_gbl_table_flags = rsdp_address.pointer_type;
  91
  92         status = acpi_tb_verify_rsdp (&rsdp_address);
  93         if (ACPI_FAILURE (status)) {
  94                 ACPI_REPORT_ERROR (("acpi_load_tables: RSDP Failed validation: %s\n",
  95                                   acpi_format_exception (status)));
  96                 goto error_exit;
  97         }
  98
  99         /* Get the RSDT via the RSDP */
 100
 101         status = acpi_tb_get_table_rsdt ();
 102         if (ACPI_FAILURE (status)) {
 103                 ACPI_REPORT_ERROR (("acpi_load_tables: Could not load RSDT: %s\n",
 104                                   acpi_format_exception (status)));
 105                 goto error_exit;
 106         }
 107
 108         /* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
 109
 110         status = acpi_tb_get_required_tables ();
 111         if (ACPI_FAILURE (status)) {
 112                 ACPI_REPORT_ERROR (("acpi_load_tables: Error getting required tables (DSDT/FADT/FACS): %s\n",
 113                                   acpi_format_exception (status)));
 114                 goto error_exit;
 115         }
 116
 117         ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 118
 119
 120         /* Load the namespace from the tables */
 121
 122         status = acpi_ns_load_namespace ();
 123         if (ACPI_FAILURE (status)) {
 124                 ACPI_REPORT_ERROR (("acpi_load_tables: Could not load namespace: %s\n",
 125                                   acpi_format_exception (status)));
 126                 goto error_exit;
 127         }
 128
 129         return_ACPI_STATUS (AE_OK);
 130
 131
 132 error_exit:
 133         ACPI_REPORT_ERROR (("acpi_load_tables: Could not load tables: %s\n",
 134                           acpi_format_exception (status)));
 135
 136         return_ACPI_STATUS (status);
 137 }
 138
 139
 140 /*******************************************************************************
 141  *
 142  * FUNCTION:    acpi_load_table
 143  *
 144  * PARAMETERS:  table_ptr       - pointer to a buffer containing the entire
 145  *                                table to be loaded
 146  *
 147  * RETURN:      Status
 148  *
 149  * DESCRIPTION: This function is called to load a table from the caller's
 150  *              buffer.  The buffer must contain an entire ACPI Table including
 151  *              a valid header.  The header fields will be verified, and if it
 152  *              is determined that the table is invalid, the call will fail.
 153  *
 154  ******************************************************************************/
 155
 156 acpi_status
 157 acpi_load_table (
 158         struct acpi_table_header        *table_ptr)
 159 {
 160         acpi_status                     status;
 161         struct acpi_table_desc          table_info;
 162         struct acpi_pointer             address;
 163
 164
 165         ACPI_FUNCTION_TRACE ("acpi_load_table");
 166
 167
 168         if (!table_ptr) {
 169                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 170         }
 171
 172         /* Copy the table to a local buffer */
 173
 174         address.pointer_type    = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
 175         address.pointer.logical = table_ptr;
 176
 177         status = acpi_tb_get_table_body (&address, table_ptr, &table_info);
 178         if (ACPI_FAILURE (status)) {
 179                 return_ACPI_STATUS (status);
 180         }
 181
 182         /* Install the new table into the local data structures */
 183
 184         status = acpi_tb_install_table (&table_info);
 185         if (ACPI_FAILURE (status)) {
 186                 /* Free table allocated by acpi_tb_get_table_body */
 187
 188                 acpi_tb_delete_single_table (&table_info);
 189                 return_ACPI_STATUS (status);
 190         }
 191
 192         /* Convert the table to common format if necessary */
 193
 194         switch (table_info.type) {
 195         case ACPI_TABLE_FADT:
 196
 197                 status = acpi_tb_convert_table_fadt ();
 198                 break;
 199
 200         case ACPI_TABLE_FACS:
 201
 202                 status = acpi_tb_build_common_facs (&table_info);
 203                 break;
 204
 205         default:
 206                 /* Load table into namespace if it contains executable AML */
 207
 208                 status = acpi_ns_load_table (table_info.installed_desc, 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  *
 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
 234 acpi_status
 235 acpi_unload_table (
 236         acpi_table_type                 table_type)
 237 {
 238         struct acpi_table_desc          *table_desc;
 239
 240
 241         ACPI_FUNCTION_TRACE ("acpi_unload_table");
 242
 243
 244         /* Parameter validation */
 245
 246         if (table_type > ACPI_TABLE_MAX) {
 247                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 248         }
 249
 250
 251         /* Find all tables of the requested type */
 252
 253         table_desc = acpi_gbl_table_lists[table_type].next;
 254         while (table_desc) {
 255                 /*
 256                  * Delete all namespace entries owned by this table.  Note that these
 257                  * entries can appear anywhere in the namespace by virtue of the AML
 258                  * "Scope" operator.  Thus, we need to track ownership by an ID, not
 259                  * simply a position within the hierarchy
 260                  */
 261                 acpi_ns_delete_namespace_by_owner (table_desc->table_id);
 262
 263                 table_desc = table_desc->next;
 264         }
 265
 266         /* Delete (or unmap) all tables of this type */
 267
 268         acpi_tb_delete_tables_by_type (table_type);
 269         return_ACPI_STATUS (AE_OK);
 270 }
 271
 272
 273 /*******************************************************************************
 274  *
 275  * FUNCTION:    acpi_get_table_header
 276  *
 277  * PARAMETERS:  table_type      - one of the defined table types
 278  *              Instance        - the non zero instance of the table, allows
 279  *                                support for multiple tables of the same type
 280  *                                see acpi_gbl_acpi_table_flag
 281  *              out_table_header - pointer to the struct acpi_table_header if successful
 282  *
 283  * DESCRIPTION: This function is called to get an ACPI table header.  The caller
 284  *              supplies an pointer to a data area sufficient to contain an ACPI
 285  *              struct acpi_table_header structure.
 286  *
 287  *              The header contains a length field that can be used to determine
 288  *              the size of the buffer needed to contain the entire table.  This
 289  *              function is not valid for the RSD PTR table since it does not
 290  *              have a standard header and is fixed length.
 291  *
 292  ******************************************************************************/
 293
 294 acpi_status
 295 acpi_get_table_header (
 296         acpi_table_type                 table_type,
 297         u32                             instance,
 298         struct acpi_table_header        *out_table_header)
 299 {
 300         struct acpi_table_header        *tbl_ptr;
 301         acpi_status                     status;
 302
 303
 304         ACPI_FUNCTION_TRACE ("acpi_get_table_header");
 305
 306
 307         if ((instance == 0)                 ||
 308                 (table_type == ACPI_TABLE_RSDP) ||
 309                 (!out_table_header)) {
 310                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 311         }
 312
 313         /* Check the table type and instance */
 314
 315         if ((table_type > ACPI_TABLE_MAX)   ||
 316                 (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags) &&
 317                  instance > 1)) {
 318                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 319         }
 320
 321
 322         /* Get a pointer to the entire table */
 323
 324         status = acpi_tb_get_table_ptr (table_type, instance, &tbl_ptr);
 325         if (ACPI_FAILURE (status)) {
 326                 return_ACPI_STATUS (status);
 327         }
 328
 329         /*
 330          * The function will return a NULL pointer if the table is not loaded
 331          */
 332         if (tbl_ptr == NULL) {
 333                 return_ACPI_STATUS (AE_NOT_EXIST);
 334         }
 335
 336         /*
 337          * Copy the header to the caller's buffer
 338          */
 339         ACPI_MEMCPY ((void *) out_table_header, (void *) tbl_ptr,
 340                          sizeof (struct acpi_table_header));
 341
 342         return_ACPI_STATUS (status);
 343 }
 344
 345
 346 /*******************************************************************************
 347  *
 348  * FUNCTION:    acpi_get_table
 349  *
 350  * PARAMETERS:  table_type      - one of the defined table types
 351  *              Instance        - the non zero instance of the table, allows
 352  *                                support for multiple tables of the same type
 353  *                                see acpi_gbl_acpi_table_flag
 354  *              ret_buffer      - pointer to a structure containing a buffer to
 355  *                                receive the table
 356  *
 357  * RETURN:      Status
 358  *
 359  * DESCRIPTION: This function is called to get an ACPI table.  The caller
 360  *              supplies an out_buffer large enough to contain the entire ACPI
 361  *              table.  The caller should call the acpi_get_table_header function
 362  *              first to determine the buffer size needed.  Upon completion
 363  *              the out_buffer->Length field will indicate the number of bytes
 364  *              copied into the out_buffer->buf_ptr buffer. This table will be
 365  *              a complete table including the header.
 366  *
 367  ******************************************************************************/
 368
 369 acpi_status
 370 acpi_get_table (
 371         acpi_table_type                 table_type,
 372         u32                             instance,
 373         struct acpi_buffer              *ret_buffer)
 374 {
 375         struct acpi_table_header        *tbl_ptr;
 376         acpi_status                     status;
 377         acpi_size                       table_length;
 378
 379
 380         ACPI_FUNCTION_TRACE ("acpi_get_table");
 381
 382
 383         /* Parameter validation */
 384
 385         if (instance == 0) {
 386                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 387         }
 388
 389         status = acpi_ut_validate_buffer (ret_buffer);
 390         if (ACPI_FAILURE (status)) {
 391                 return_ACPI_STATUS (status);
 392         }
 393
 394         /* Check the table type and instance */
 395
 396         if ((table_type > ACPI_TABLE_MAX)   ||
 397                 (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags) &&
 398                  instance > 1)) {
 399                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 400         }
 401
 402
 403         /* Get a pointer to the entire table */
 404
 405         status = acpi_tb_get_table_ptr (table_type, instance, &tbl_ptr);
 406         if (ACPI_FAILURE (status)) {
 407                 return_ACPI_STATUS (status);
 408         }
 409
 410         /*
 411          * acpi_tb_get_table_ptr will return a NULL pointer if the
 412          * table is not loaded.
 413          */
 414         if (tbl_ptr == NULL) {
 415                 return_ACPI_STATUS (AE_NOT_EXIST);
 416         }
 417
 418         /* Get the table length */
 419
 420         if (table_type == ACPI_TABLE_RSDP) {
 421                 /*
 422                  *  RSD PTR is the only "table" without a header
 423                  */
 424                 table_length = sizeof (struct rsdp_descriptor);
 425         }
 426         else {
 427                 table_length = (acpi_size) tbl_ptr->length;
 428         }
 429
 430         /* Validate/Allocate/Clear caller buffer */
 431
 432         status = acpi_ut_initialize_buffer (ret_buffer, table_length);
 433         if (ACPI_FAILURE (status)) {
 434                 return_ACPI_STATUS (status);
 435         }
 436
 437         /* Copy the table to the buffer */
 438
 439         ACPI_MEMCPY ((void *) ret_buffer->pointer, (void *) tbl_ptr, table_length);
 440         return_ACPI_STATUS (AE_OK);
 441 }
 442
 443