drivers/acpi/acpica/utmisc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utmisc - common utility procedures
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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 #if (defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP)
  79 /*******************************************************************************
  80  *
  81  * FUNCTION:    acpi_ut_is_aml_table
  82  *
  83  * PARAMETERS:  table               - An ACPI table
  84  *
  85  * RETURN:      TRUE if table contains executable AML; FALSE otherwise
  86  *
  87  * DESCRIPTION: Check ACPI Signature for a table that contains AML code.
  88  *              Currently, these are DSDT,SSDT,PSDT. All other table types are
  89  *              data tables that do not contain AML code.
  90  *
  91  ******************************************************************************/
  92
  93 u8 acpi_ut_is_aml_table(struct acpi_table_header *table)
  94 {
  95
  96         /* These are the only tables that contain executable AML */
  97
  98         if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) ||
  99             ACPI_COMPARE_NAME(table->signature, ACPI_SIG_PSDT) ||
 100             ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT) ||
 101             ACPI_COMPARE_NAME(table->signature, ACPI_SIG_OSDT)) {
 102                 return (TRUE);
 103         }
 104
 105         return (FALSE);
 106 }
 107 #endif
 108
 109 /*******************************************************************************
 110  *
 111  * FUNCTION:    acpi_ut_dword_byte_swap
 112  *
 113  * PARAMETERS:  value           - Value to be converted
 114  *
 115  * RETURN:      u32 integer with bytes swapped
 116  *
 117  * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
 118  *
 119  ******************************************************************************/
 120
 121 u32 acpi_ut_dword_byte_swap(u32 value)
 122 {
 123         union {
 124                 u32 value;
 125                 u8 bytes[4];
 126         } out;
 127         union {
 128                 u32 value;
 129                 u8 bytes[4];
 130         } in;
 131
 132         ACPI_FUNCTION_ENTRY();
 133
 134         in.value = value;
 135
 136         out.bytes[0] = in.bytes[3];
 137         out.bytes[1] = in.bytes[2];
 138         out.bytes[2] = in.bytes[1];
 139         out.bytes[3] = in.bytes[0];
 140
 141         return (out.value);
 142 }
 143
 144 /*******************************************************************************
 145  *
 146  * FUNCTION:    acpi_ut_set_integer_width
 147  *
 148  * PARAMETERS:  Revision            From DSDT header
 149  *
 150  * RETURN:      None
 151  *
 152  * DESCRIPTION: Set the global integer bit width based upon the revision
 153  *              of the DSDT. For Revision 1 and 0, Integers are 32 bits.
 154  *              For Revision 2 and above, Integers are 64 bits. Yes, this
 155  *              makes a difference.
 156  *
 157  ******************************************************************************/
 158
 159 void acpi_ut_set_integer_width(u8 revision)
 160 {
 161
 162         if (revision < 2) {
 163
 164                 /* 32-bit case */
 165
 166                 acpi_gbl_integer_bit_width = 32;
 167                 acpi_gbl_integer_nybble_width = 8;
 168                 acpi_gbl_integer_byte_width = 4;
 169         } else {
 170                 /* 64-bit case (ACPI 2.0+) */
 171
 172                 acpi_gbl_integer_bit_width = 64;
 173                 acpi_gbl_integer_nybble_width = 16;
 174                 acpi_gbl_integer_byte_width = 8;
 175         }
 176 }
 177
 178 /*******************************************************************************
 179  *
 180  * FUNCTION:    acpi_ut_create_update_state_and_push
 181  *
 182  * PARAMETERS:  object          - Object to be added to the new state
 183  *              action          - Increment/Decrement
 184  *              state_list      - List the state will be added to
 185  *
 186  * RETURN:      Status
 187  *
 188  * DESCRIPTION: Create a new state and push it
 189  *
 190  ******************************************************************************/
 191
 192 acpi_status
 193 acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
 194                                      u16 action,
 195                                      union acpi_generic_state **state_list)
 196 {
 197         union acpi_generic_state *state;
 198
 199         ACPI_FUNCTION_ENTRY();
 200
 201         /* Ignore null objects; these are expected */
 202
 203         if (!object) {
 204                 return (AE_OK);
 205         }
 206
 207         state = acpi_ut_create_update_state(object, action);
 208         if (!state) {
 209                 return (AE_NO_MEMORY);
 210         }
 211
 212         acpi_ut_push_generic_state(state_list, state);
 213         return (AE_OK);
 214 }
 215
 216 /*******************************************************************************
 217  *
 218  * FUNCTION:    acpi_ut_walk_package_tree
 219  *
 220  * PARAMETERS:  source_object       - The package to walk
 221  *              target_object       - Target object (if package is being copied)
 222  *              walk_callback       - Called once for each package element
 223  *              context             - Passed to the callback function
 224  *
 225  * RETURN:      Status
 226  *
 227  * DESCRIPTION: Walk through a package
 228  *
 229  ******************************************************************************/
 230
 231 acpi_status
 232 acpi_ut_walk_package_tree(union acpi_operand_object *source_object,
 233                           void *target_object,
 234                           acpi_pkg_callback walk_callback, void *context)
 235 {
 236         acpi_status status = AE_OK;
 237         union acpi_generic_state *state_list = NULL;
 238         union acpi_generic_state *state;
 239         u32 this_index;
 240         union acpi_operand_object *this_source_obj;
 241
 242         ACPI_FUNCTION_TRACE(ut_walk_package_tree);
 243
 244         state = acpi_ut_create_pkg_state(source_object, target_object, 0);
 245         if (!state) {
 246                 return_ACPI_STATUS(AE_NO_MEMORY);
 247         }
 248
 249         while (state) {
 250
 251                 /* Get one element of the package */
 252
 253                 this_index = state->pkg.index;
 254                 this_source_obj = (union acpi_operand_object *)
 255                     state->pkg.source_object->package.elements[this_index];
 256
 257                 /*
 258                  * Check for:
 259                  * 1) An uninitialized package element. It is completely
 260                  *    legal to declare a package and leave it uninitialized
 261                  * 2) Not an internal object - can be a namespace node instead
 262                  * 3) Any type other than a package. Packages are handled in else
 263                  *    case below.
 264                  */
 265                 if ((!this_source_obj) ||
 266                     (ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
 267                      ACPI_DESC_TYPE_OPERAND)
 268                     || (this_source_obj->common.type != ACPI_TYPE_PACKAGE)) {
 269                         status =
 270                             walk_callback(ACPI_COPY_TYPE_SIMPLE,
 271                                           this_source_obj, state, context);
 272                         if (ACPI_FAILURE(status)) {
 273                                 return_ACPI_STATUS(status);
 274                         }
 275
 276                         state->pkg.index++;
 277                         while (state->pkg.index >=
 278                                state->pkg.source_object->package.count) {
 279                                 /*
 280                                  * We've handled all of the objects at this level,  This means
 281                                  * that we have just completed a package. That package may
 282                                  * have contained one or more packages itself.
 283                                  *
 284                                  * Delete this state and pop the previous state (package).
 285                                  */
 286                                 acpi_ut_delete_generic_state(state);
 287                                 state = acpi_ut_pop_generic_state(&state_list);
 288
 289                                 /* Finished when there are no more states */
 290
 291                                 if (!state) {
 292                                         /*
 293                                          * We have handled all of the objects in the top level
 294                                          * package just add the length of the package objects
 295                                          * and exit
 296                                          */
 297                                         return_ACPI_STATUS(AE_OK);
 298                                 }
 299
 300                                 /*
 301                                  * Go back up a level and move the index past the just
 302                                  * completed package object.
 303                                  */
 304                                 state->pkg.index++;
 305                         }
 306                 } else {
 307                         /* This is a subobject of type package */
 308
 309                         status =
 310                             walk_callback(ACPI_COPY_TYPE_PACKAGE,
 311                                           this_source_obj, state, context);
 312                         if (ACPI_FAILURE(status)) {
 313                                 return_ACPI_STATUS(status);
 314                         }
 315
 316                         /*
 317                          * Push the current state and create a new one
 318                          * The callback above returned a new target package object.
 319                          */
 320                         acpi_ut_push_generic_state(&state_list, state);
 321                         state = acpi_ut_create_pkg_state(this_source_obj,
 322                                                          state->pkg.
 323                                                          this_target_obj, 0);
 324                         if (!state) {
 325
 326                                 /* Free any stacked Update State objects */
 327
 328                                 while (state_list) {
 329                                         state =
 330                                             acpi_ut_pop_generic_state
 331                                             (&state_list);
 332                                         acpi_ut_delete_generic_state(state);
 333                                 }
 334                                 return_ACPI_STATUS(AE_NO_MEMORY);
 335                         }
 336                 }
 337         }
 338
 339         /* We should never get here */
 340
 341         return_ACPI_STATUS(AE_AML_INTERNAL);
 342 }
 343
 344 #ifdef ACPI_DEBUG_OUTPUT
 345 /*******************************************************************************
 346  *
 347  * FUNCTION:    acpi_ut_display_init_pathname
 348  *
 349  * PARAMETERS:  type                - Object type of the node
 350  *              obj_handle          - Handle whose pathname will be displayed
 351  *              path                - Additional path string to be appended.
 352  *                                      (NULL if no extra path)
 353  *
 354  * RETURN:      acpi_status
 355  *
 356  * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
 357  *
 358  ******************************************************************************/
 359
 360 void
 361 acpi_ut_display_init_pathname(u8 type,
 362                               struct acpi_namespace_node *obj_handle,
 363                               char *path)
 364 {
 365         acpi_status status;
 366         struct acpi_buffer buffer;
 367
 368         ACPI_FUNCTION_ENTRY();
 369
 370         /* Only print the path if the appropriate debug level is enabled */
 371
 372         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
 373                 return;
 374         }
 375
 376         /* Get the full pathname to the node */
 377
 378         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 379         status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
 380         if (ACPI_FAILURE(status)) {
 381                 return;
 382         }
 383
 384         /* Print what we're doing */
 385
 386         switch (type) {
 387         case ACPI_TYPE_METHOD:
 388
 389                 acpi_os_printf("Executing  ");
 390                 break;
 391
 392         default:
 393
 394                 acpi_os_printf("Initializing ");
 395                 break;
 396         }
 397
 398         /* Print the object type and pathname */
 399
 400         acpi_os_printf("%-12s %s",
 401                        acpi_ut_get_type_name(type), (char *)buffer.pointer);
 402
 403         /* Extra path is used to append names like _STA, _INI, etc. */
 404
 405         if (path) {
 406                 acpi_os_printf(".%s", path);
 407         }
 408         acpi_os_printf("\n");
 409
 410         ACPI_FREE(buffer.pointer);
 411 }
 412 #endif