drivers/acpi/acpica/utmisc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utmisc - common utility procedures
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acnamesp.h"
  47
  48 #define _COMPONENT          ACPI_UTILITIES
  49 ACPI_MODULE_NAME("utmisc")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_ut_is_pci_root_bridge
  54  *
  55  * PARAMETERS:  id              - The HID/CID in string format
  56  *
  57  * RETURN:      TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
  58  *
  59  * DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
  60  *
  61  ******************************************************************************/
  62 u8 acpi_ut_is_pci_root_bridge(char *id)
  63 {
  64
  65         /*
  66          * Check if this is a PCI root bridge.
  67          * ACPI 3.0+: check for a PCI Express root also.
  68          */
  69         if (!(ACPI_STRCMP(id,
  70                           PCI_ROOT_HID_STRING)) ||
  71             !(ACPI_STRCMP(id, PCI_EXPRESS_ROOT_HID_STRING))) {
  72                 return (TRUE);
  73         }
  74
  75         return (FALSE);
  76 }
  77
  78 /*******************************************************************************
  79  *
  80  * FUNCTION:    acpi_ut_is_aml_table
  81  *
  82  * PARAMETERS:  table               - An ACPI table
  83  *
  84  * RETURN:      TRUE if table contains executable AML; FALSE otherwise
  85  *
  86  * DESCRIPTION: Check ACPI Signature for a table that contains AML code.
  87  *              Currently, these are DSDT,SSDT,PSDT. All other table types are
  88  *              data tables that do not contain AML code.
  89  *
  90  ******************************************************************************/
  91
  92 u8 acpi_ut_is_aml_table(struct acpi_table_header *table)
  93 {
  94
  95         /* These are the only tables that contain executable AML */
  96
  97         if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) ||
  98             ACPI_COMPARE_NAME(table->signature, ACPI_SIG_PSDT) ||
  99             ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
 100                 return (TRUE);
 101         }
 102
 103         return (FALSE);
 104 }
 105
 106 /*******************************************************************************
 107  *
 108  * FUNCTION:    acpi_ut_dword_byte_swap
 109  *
 110  * PARAMETERS:  value           - Value to be converted
 111  *
 112  * RETURN:      u32 integer with bytes swapped
 113  *
 114  * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
 115  *
 116  ******************************************************************************/
 117
 118 u32 acpi_ut_dword_byte_swap(u32 value)
 119 {
 120         union {
 121                 u32 value;
 122                 u8 bytes[4];
 123         } out;
 124         union {
 125                 u32 value;
 126                 u8 bytes[4];
 127         } in;
 128
 129         ACPI_FUNCTION_ENTRY();
 130
 131         in.value = value;
 132
 133         out.bytes[0] = in.bytes[3];
 134         out.bytes[1] = in.bytes[2];
 135         out.bytes[2] = in.bytes[1];
 136         out.bytes[3] = in.bytes[0];
 137
 138         return (out.value);
 139 }
 140
 141 /*******************************************************************************
 142  *
 143  * FUNCTION:    acpi_ut_set_integer_width
 144  *
 145  * PARAMETERS:  Revision            From DSDT header
 146  *
 147  * RETURN:      None
 148  *
 149  * DESCRIPTION: Set the global integer bit width based upon the revision
 150  *              of the DSDT. For Revision 1 and 0, Integers are 32 bits.
 151  *              For Revision 2 and above, Integers are 64 bits. Yes, this
 152  *              makes a difference.
 153  *
 154  ******************************************************************************/
 155
 156 void acpi_ut_set_integer_width(u8 revision)
 157 {
 158
 159         if (revision < 2) {
 160
 161                 /* 32-bit case */
 162
 163                 acpi_gbl_integer_bit_width = 32;
 164                 acpi_gbl_integer_nybble_width = 8;
 165                 acpi_gbl_integer_byte_width = 4;
 166         } else {
 167                 /* 64-bit case (ACPI 2.0+) */
 168
 169                 acpi_gbl_integer_bit_width = 64;
 170                 acpi_gbl_integer_nybble_width = 16;
 171                 acpi_gbl_integer_byte_width = 8;
 172         }
 173 }
 174
 175 /*******************************************************************************
 176  *
 177  * FUNCTION:    acpi_ut_create_update_state_and_push
 178  *
 179  * PARAMETERS:  object          - Object to be added to the new state
 180  *              action          - Increment/Decrement
 181  *              state_list      - List the state will be added to
 182  *
 183  * RETURN:      Status
 184  *
 185  * DESCRIPTION: Create a new state and push it
 186  *
 187  ******************************************************************************/
 188
 189 acpi_status
 190 acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
 191                                      u16 action,
 192                                      union acpi_generic_state **state_list)
 193 {
 194         union acpi_generic_state *state;
 195
 196         ACPI_FUNCTION_ENTRY();
 197
 198         /* Ignore null objects; these are expected */
 199
 200         if (!object) {
 201                 return (AE_OK);
 202         }
 203
 204         state = acpi_ut_create_update_state(object, action);
 205         if (!state) {
 206                 return (AE_NO_MEMORY);
 207         }
 208
 209         acpi_ut_push_generic_state(state_list, state);
 210         return (AE_OK);
 211 }
 212
 213 /*******************************************************************************
 214  *
 215  * FUNCTION:    acpi_ut_walk_package_tree
 216  *
 217  * PARAMETERS:  source_object       - The package to walk
 218  *              target_object       - Target object (if package is being copied)
 219  *              walk_callback       - Called once for each package element
 220  *              context             - Passed to the callback function
 221  *
 222  * RETURN:      Status
 223  *
 224  * DESCRIPTION: Walk through a package
 225  *
 226  ******************************************************************************/
 227
 228 acpi_status
 229 acpi_ut_walk_package_tree(union acpi_operand_object *source_object,
 230                           void *target_object,
 231                           acpi_pkg_callback walk_callback, void *context)
 232 {
 233         acpi_status status = AE_OK;
 234         union acpi_generic_state *state_list = NULL;
 235         union acpi_generic_state *state;
 236         u32 this_index;
 237         union acpi_operand_object *this_source_obj;
 238
 239         ACPI_FUNCTION_TRACE(ut_walk_package_tree);
 240
 241         state = acpi_ut_create_pkg_state(source_object, target_object, 0);
 242         if (!state) {
 243                 return_ACPI_STATUS(AE_NO_MEMORY);
 244         }
 245
 246         while (state) {
 247
 248                 /* Get one element of the package */
 249
 250                 this_index = state->pkg.index;
 251                 this_source_obj = (union acpi_operand_object *)
 252                     state->pkg.source_object->package.elements[this_index];
 253
 254                 /*
 255                  * Check for:
 256                  * 1) An uninitialized package element. It is completely
 257                  *    legal to declare a package and leave it uninitialized
 258                  * 2) Not an internal object - can be a namespace node instead
 259                  * 3) Any type other than a package. Packages are handled in else
 260                  *    case below.
 261                  */
 262                 if ((!this_source_obj) ||
 263                     (ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
 264                      ACPI_DESC_TYPE_OPERAND)
 265                     || (this_source_obj->common.type != ACPI_TYPE_PACKAGE)) {
 266                         status =
 267                             walk_callback(ACPI_COPY_TYPE_SIMPLE,
 268                                           this_source_obj, state, context);
 269                         if (ACPI_FAILURE(status)) {
 270                                 return_ACPI_STATUS(status);
 271                         }
 272
 273                         state->pkg.index++;
 274                         while (state->pkg.index >=
 275                                state->pkg.source_object->package.count) {
 276                                 /*
 277                                  * We've handled all of the objects at this level,  This means
 278                                  * that we have just completed a package. That package may
 279                                  * have contained one or more packages itself.
 280                                  *
 281                                  * Delete this state and pop the previous state (package).
 282                                  */
 283                                 acpi_ut_delete_generic_state(state);
 284                                 state = acpi_ut_pop_generic_state(&state_list);
 285
 286                                 /* Finished when there are no more states */
 287
 288                                 if (!state) {
 289                                         /*
 290                                          * We have handled all of the objects in the top level
 291                                          * package just add the length of the package objects
 292                                          * and exit
 293                                          */
 294                                         return_ACPI_STATUS(AE_OK);
 295                                 }
 296
 297                                 /*
 298                                  * Go back up a level and move the index past the just
 299                                  * completed package object.
 300                                  */
 301                                 state->pkg.index++;
 302                         }
 303                 } else {
 304                         /* This is a subobject of type package */
 305
 306                         status =
 307                             walk_callback(ACPI_COPY_TYPE_PACKAGE,
 308                                           this_source_obj, state, context);
 309                         if (ACPI_FAILURE(status)) {
 310                                 return_ACPI_STATUS(status);
 311                         }
 312
 313                         /*
 314                          * Push the current state and create a new one
 315                          * The callback above returned a new target package object.
 316                          */
 317                         acpi_ut_push_generic_state(&state_list, state);
 318                         state = acpi_ut_create_pkg_state(this_source_obj,
 319                                                          state->pkg.
 320                                                          this_target_obj, 0);
 321                         if (!state) {
 322
 323                                 /* Free any stacked Update State objects */
 324
 325                                 while (state_list) {
 326                                         state =
 327                                             acpi_ut_pop_generic_state
 328                                             (&state_list);
 329                                         acpi_ut_delete_generic_state(state);
 330                                 }
 331                                 return_ACPI_STATUS(AE_NO_MEMORY);
 332                         }
 333                 }
 334         }
 335
 336         /* We should never get here */
 337
 338         return_ACPI_STATUS(AE_AML_INTERNAL);
 339 }
 340
 341 #ifdef ACPI_DEBUG_OUTPUT
 342 /*******************************************************************************
 343  *
 344  * FUNCTION:    acpi_ut_display_init_pathname
 345  *
 346  * PARAMETERS:  type                - Object type of the node
 347  *              obj_handle          - Handle whose pathname will be displayed
 348  *              path                - Additional path string to be appended.
 349  *                                      (NULL if no extra path)
 350  *
 351  * RETURN:      acpi_status
 352  *
 353  * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
 354  *
 355  ******************************************************************************/
 356
 357 void
 358 acpi_ut_display_init_pathname(u8 type,
 359                               struct acpi_namespace_node *obj_handle,
 360                               char *path)
 361 {
 362         acpi_status status;
 363         struct acpi_buffer buffer;
 364
 365         ACPI_FUNCTION_ENTRY();
 366
 367         /* Only print the path if the appropriate debug level is enabled */
 368
 369         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
 370                 return;
 371         }
 372
 373         /* Get the full pathname to the node */
 374
 375         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 376         status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
 377         if (ACPI_FAILURE(status)) {
 378                 return;
 379         }
 380
 381         /* Print what we're doing */
 382
 383         switch (type) {
 384         case ACPI_TYPE_METHOD:
 385                 acpi_os_printf("Executing  ");
 386                 break;
 387
 388         default:
 389                 acpi_os_printf("Initializing ");
 390                 break;
 391         }
 392
 393         /* Print the object type and pathname */
 394
 395         acpi_os_printf("%-12s %s",
 396                        acpi_ut_get_type_name(type), (char *)buffer.pointer);
 397
 398         /* Extra path is used to append names like _STA, _INI, etc. */
 399
 400         if (path) {
 401                 acpi_os_printf(".%s", path);
 402         }
 403         acpi_os_printf("\n");
 404
 405         ACPI_FREE(buffer.pointer);
 406 }
 407 #endif