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utobject.c

/******************************************************************************
 *
 * Module Name: utobject - ACPI object create/delete/size/cache routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/acnamesp.h>
#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utobject")

/* Local prototypes */
static acpi_status
acpi_ut_get_simple_object_size(union acpi_operand_object *obj,
                         acpi_size * obj_length);

static acpi_status
acpi_ut_get_package_object_size(union acpi_operand_object *obj,
                        acpi_size * obj_length);

static acpi_status
acpi_ut_get_element_length(u8 object_type,
                     union acpi_operand_object *source_object,
                     union acpi_generic_state *state, void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_internal_object_dbg
 *
 * PARAMETERS:  module_name         - Source file name of caller
 *              line_number         - Line number of caller
 *              component_id        - Component type of caller
 *              Type                - ACPI Type of the new object
 *
 * RETURN:      A new internal object, null on failure
 *
 * DESCRIPTION: Create and initialize a new internal object.
 *
 * NOTE:        We always allocate the worst-case object descriptor because
 *              these objects are cached, and we want them to be
 *              one-size-satisifies-any-request.  This in itself may not be
 *              the most memory efficient, but the efficiency of the object
 *              cache should more than make up for this!
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_internal_object_dbg(char *module_name,
                                                u32 line_number,
                                                u32 component_id,
                                                acpi_object_type
                                                type)
{
      union acpi_operand_object *object;
      union acpi_operand_object *second_object;

      ACPI_FUNCTION_TRACE_STR(ut_create_internal_object_dbg,
                        acpi_ut_get_type_name(type));

      /* Allocate the raw object descriptor */

      object =
          acpi_ut_allocate_object_desc_dbg(module_name, line_number,
                                   component_id);
      if (!object) {
            return_PTR(NULL);
      }

      switch (type) {
      case ACPI_TYPE_REGION:
      case ACPI_TYPE_BUFFER_FIELD:

            /* These types require a secondary object */

            second_object = acpi_ut_allocate_object_desc_dbg(module_name,
                                                 line_number,
                                                 component_id);
            if (!second_object) {
                  acpi_ut_delete_object_desc(object);
                  return_PTR(NULL);
            }

            second_object->common.type = ACPI_TYPE_LOCAL_EXTRA;
            second_object->common.reference_count = 1;

            /* Link the second object to the first */

            object->common.next_object = second_object;
            break;

      default:
            /* All others have no secondary object */
            break;
      }

      /* Save the object type in the object descriptor */

      object->common.type = (u8) type;

      /* Init the reference count */

      object->common.reference_count = 1;

      /* Any per-type initialization should go here */

      return_PTR(object);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_package_object
 *
 * PARAMETERS:  Count               - Number of package elements
 *
 * RETURN:      Pointer to a new Package object, null on failure
 *
 * DESCRIPTION: Create a fully initialized package object
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_package_object(u32 count)
{
      union acpi_operand_object *package_desc;
      union acpi_operand_object **package_elements;

      ACPI_FUNCTION_TRACE_U32(ut_create_package_object, count);

      /* Create a new Package object */

      package_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
      if (!package_desc) {
            return_PTR(NULL);
      }

      /*
       * Create the element array. Count+1 allows the array to be null
       * terminated.
       */
      package_elements = ACPI_ALLOCATE_ZEROED((acpi_size)
                                    (count + 1) * sizeof(void *));
      if (!package_elements) {
            acpi_ut_remove_reference(package_desc);
            return_PTR(NULL);
      }

      package_desc->package.count = count;
      package_desc->package.elements = package_elements;
      return_PTR(package_desc);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_buffer_object
 *
 * PARAMETERS:  buffer_size            - Size of buffer to be created
 *
 * RETURN:      Pointer to a new Buffer object, null on failure
 *
 * DESCRIPTION: Create a fully initialized buffer object
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_buffer_object(acpi_size buffer_size)
{
      union acpi_operand_object *buffer_desc;
      u8 *buffer = NULL;

      ACPI_FUNCTION_TRACE_U32(ut_create_buffer_object, buffer_size);

      /* Create a new Buffer object */

      buffer_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
      if (!buffer_desc) {
            return_PTR(NULL);
      }

      /* Create an actual buffer only if size > 0 */

      if (buffer_size > 0) {

            /* Allocate the actual buffer */

            buffer = ACPI_ALLOCATE_ZEROED(buffer_size);
            if (!buffer) {
                  ACPI_ERROR((AE_INFO, "Could not allocate size %X",
                            (u32) buffer_size));
                  acpi_ut_remove_reference(buffer_desc);
                  return_PTR(NULL);
            }
      }

      /* Complete buffer object initialization */

      buffer_desc->buffer.flags |= AOPOBJ_DATA_VALID;
      buffer_desc->buffer.pointer = buffer;
      buffer_desc->buffer.length = (u32) buffer_size;

      /* Return the new buffer descriptor */

      return_PTR(buffer_desc);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_string_object
 *
 * PARAMETERS:  string_size         - Size of string to be created. Does not
 *                                    include NULL terminator, this is added
 *                                    automatically.
 *
 * RETURN:      Pointer to a new String object
 *
 * DESCRIPTION: Create a fully initialized string object
 *
 ******************************************************************************/

union acpi_operand_object *acpi_ut_create_string_object(acpi_size string_size)
{
      union acpi_operand_object *string_desc;
      char *string;

      ACPI_FUNCTION_TRACE_U32(ut_create_string_object, string_size);

      /* Create a new String object */

      string_desc = acpi_ut_create_internal_object(ACPI_TYPE_STRING);
      if (!string_desc) {
            return_PTR(NULL);
      }

      /*
       * Allocate the actual string buffer -- (Size + 1) for NULL terminator.
       * NOTE: Zero-length strings are NULL terminated
       */
      string = ACPI_ALLOCATE_ZEROED(string_size + 1);
      if (!string) {
            ACPI_ERROR((AE_INFO, "Could not allocate size %X",
                      (u32) string_size));
            acpi_ut_remove_reference(string_desc);
            return_PTR(NULL);
      }

      /* Complete string object initialization */

      string_desc->string.pointer = string;
      string_desc->string.length = (u32) string_size;

      /* Return the new string descriptor */

      return_PTR(string_desc);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_valid_internal_object
 *
 * PARAMETERS:  Object              - Object to be validated
 *
 * RETURN:      TRUE if object is valid, FALSE otherwise
 *
 * DESCRIPTION: Validate a pointer to be an union acpi_operand_object
 *
 ******************************************************************************/

u8 acpi_ut_valid_internal_object(void *object)
{

      ACPI_FUNCTION_NAME(ut_valid_internal_object);

      /* Check for a null pointer */

      if (!object) {
            ACPI_DEBUG_PRINT((ACPI_DB_INFO, "**** Null Object Ptr\n"));
            return (FALSE);
      }

      /* Check the descriptor type field */

      switch (ACPI_GET_DESCRIPTOR_TYPE(object)) {
      case ACPI_DESC_TYPE_OPERAND:

            /* The object appears to be a valid union acpi_operand_object    */

            return (TRUE);

      default:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "%p is not not an ACPI operand obj [%s]\n",
                          object, acpi_ut_get_descriptor_name(object)));
            break;
      }

      return (FALSE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_allocate_object_desc_dbg
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              component_id        - Caller's component ID (for error output)
 *
 * RETURN:      Pointer to newly allocated object descriptor.  Null on error
 *
 * DESCRIPTION: Allocate a new object descriptor.  Gracefully handle
 *              error conditions.
 *
 ******************************************************************************/

void *acpi_ut_allocate_object_desc_dbg(char *module_name,
                               u32 line_number, u32 component_id)
{
      union acpi_operand_object *object;

      ACPI_FUNCTION_TRACE(ut_allocate_object_desc_dbg);

      object = acpi_os_acquire_object(acpi_gbl_operand_cache);
      if (!object) {
            ACPI_ERROR((module_name, line_number,
                      "Could not allocate an object descriptor"));

            return_PTR(NULL);
      }

      /* Mark the descriptor type */

      memset(object, 0, sizeof(union acpi_operand_object));
      ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_OPERAND);

      ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "%p Size %X\n",
                    object, (u32) sizeof(union acpi_operand_object)));

      return_PTR(object);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_delete_object_desc
 *
 * PARAMETERS:  Object          - An Acpi internal object to be deleted
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
 *
 ******************************************************************************/

void acpi_ut_delete_object_desc(union acpi_operand_object *object)
{
      ACPI_FUNCTION_TRACE_PTR(ut_delete_object_desc, object);

      /* Object must be an union acpi_operand_object    */

      if (ACPI_GET_DESCRIPTOR_TYPE(object) != ACPI_DESC_TYPE_OPERAND) {
            ACPI_ERROR((AE_INFO,
                      "%p is not an ACPI Operand object [%s]", object,
                      acpi_ut_get_descriptor_name(object)));
            return_VOID;
      }

      (void)acpi_os_release_object(acpi_gbl_operand_cache, object);
      return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_simple_object_size
 *
 * PARAMETERS:  internal_object    - An ACPI operand object
 *              obj_length         - Where the length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to determine the space required to
 *              contain a simple object for return to an external user.
 *
 *              The length includes the object structure plus any additional
 *              needed space.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_get_simple_object_size(union acpi_operand_object *internal_object,
                         acpi_size * obj_length)
{
      acpi_size length;
      acpi_status status = AE_OK;

      ACPI_FUNCTION_TRACE_PTR(ut_get_simple_object_size, internal_object);

      /*
       * Handle a null object (Could be a uninitialized package
       * element -- which is legal)
       */
      if (!internal_object) {
            *obj_length = 0;
            return_ACPI_STATUS(AE_OK);
      }

      /* Start with the length of the Acpi object */

      length = sizeof(union acpi_object);

      if (ACPI_GET_DESCRIPTOR_TYPE(internal_object) == ACPI_DESC_TYPE_NAMED) {

            /* Object is a named object (reference), just return the length */

            *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
            return_ACPI_STATUS(status);
      }

      /*
       * The final length depends on the object type
       * Strings and Buffers are packed right up against the parent object and
       * must be accessed bytewise or there may be alignment problems on
       * certain processors
       */
      switch (ACPI_GET_OBJECT_TYPE(internal_object)) {
      case ACPI_TYPE_STRING:

            length += (acpi_size) internal_object->string.length + 1;
            break;

      case ACPI_TYPE_BUFFER:

            length += (acpi_size) internal_object->buffer.length;
            break;

      case ACPI_TYPE_INTEGER:
      case ACPI_TYPE_PROCESSOR:
      case ACPI_TYPE_POWER:

            /*
             * No extra data for these types
             */
            break;

      case ACPI_TYPE_LOCAL_REFERENCE:

            switch (internal_object->reference.opcode) {
            case AML_INT_NAMEPATH_OP:

                  /*
                   * Get the actual length of the full pathname to this object.
                   * The reference will be converted to the pathname to the object
                   */
                  length +=
                      ACPI_ROUND_UP_TO_NATIVE_WORD
                      (acpi_ns_get_pathname_length
                       (internal_object->reference.node));
                  break;

            default:

                  /*
                   * No other reference opcodes are supported.
                   * Notably, Locals and Args are not supported, but this may be
                   * required eventually.
                   */
                  ACPI_ERROR((AE_INFO,
                            "Unsupported Reference opcode=%X in object %p",
                            internal_object->reference.opcode,
                            internal_object));
                  status = AE_TYPE;
                  break;
            }
            break;

      default:

            ACPI_ERROR((AE_INFO, "Unsupported type=%X in object %p",
                      ACPI_GET_OBJECT_TYPE(internal_object),
                      internal_object));
            status = AE_TYPE;
            break;
      }

      /*
       * Account for the space required by the object rounded up to the next
       * multiple of the machine word size.  This keeps each object aligned
       * on a machine word boundary. (preventing alignment faults on some
       * machines.)
       */
      *obj_length = ACPI_ROUND_UP_TO_NATIVE_WORD(length);
      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_element_length
 *
 * PARAMETERS:  acpi_pkg_callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the length of one package element.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_get_element_length(u8 object_type,
                     union acpi_operand_object *source_object,
                     union acpi_generic_state *state, void *context)
{
      acpi_status status = AE_OK;
      struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
      acpi_size object_space;

      switch (object_type) {
      case ACPI_COPY_TYPE_SIMPLE:

            /*
             * Simple object - just get the size (Null object/entry is handled
             * here also) and sum it into the running package length
             */
            status =
                acpi_ut_get_simple_object_size(source_object,
                                       &object_space);
            if (ACPI_FAILURE(status)) {
                  return (status);
            }

            info->length += object_space;
            break;

      case ACPI_COPY_TYPE_PACKAGE:

            /* Package object - nothing much to do here, let the walk handle it */

            info->num_packages++;
            state->pkg.this_target_obj = NULL;
            break;

      default:

            /* No other types allowed */

            return (AE_BAD_PARAMETER);
      }

      return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_package_object_size
 *
 * PARAMETERS:  internal_object     - An ACPI internal object
 *              obj_length          - Where the length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to determine the space required to
 *              contain a package object for return to an external user.
 *
 *              This is moderately complex since a package contains other
 *              objects including packages.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_get_package_object_size(union acpi_operand_object *internal_object,
                        acpi_size * obj_length)
{
      acpi_status status;
      struct acpi_pkg_info info;

      ACPI_FUNCTION_TRACE_PTR(ut_get_package_object_size, internal_object);

      info.length = 0;
      info.object_space = 0;
      info.num_packages = 1;

      status = acpi_ut_walk_package_tree(internal_object, NULL,
                                 acpi_ut_get_element_length, &info);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      /*
       * We have handled all of the objects in all levels of the package.
       * just add the length of the package objects themselves.
       * Round up to the next machine word.
       */
      info.length += ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object)) *
          (acpi_size) info.num_packages;

      /* Return the total package length */

      *obj_length = info.length;
      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_object_size
 *
 * PARAMETERS:  internal_object     - An ACPI internal object
 *              obj_length          - Where the length will be returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to determine the space required to
 *              contain an object for return to an API user.
 *
 ******************************************************************************/

acpi_status
acpi_ut_get_object_size(union acpi_operand_object *internal_object,
                  acpi_size * obj_length)
{
      acpi_status status;

      ACPI_FUNCTION_ENTRY();

      if ((ACPI_GET_DESCRIPTOR_TYPE(internal_object) ==
           ACPI_DESC_TYPE_OPERAND)
          && (ACPI_GET_OBJECT_TYPE(internal_object) == ACPI_TYPE_PACKAGE)) {
            status =
                acpi_ut_get_package_object_size(internal_object,
                                        obj_length);
      } else {
            status =
                acpi_ut_get_simple_object_size(internal_object, obj_length);
      }

      return (status);
}

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