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rslist.c

/*******************************************************************************
 *
 * Module Name: rslist - Linked list utilities
 *
 ******************************************************************************/

/*
 * 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/acresrc.h>

#define _COMPONENT          ACPI_RESOURCES
ACPI_MODULE_NAME("rslist")

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_convert_aml_to_resources
 *
 * PARAMETERS:  acpi_walk_aml_callback
 *              resource_ptr            - Pointer to the buffer that will
 *                                        contain the output structures
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an AML resource to an internal representation of the
 *              resource that is aligned and easier to access.
 *
 ******************************************************************************/
acpi_status
acpi_rs_convert_aml_to_resources(u8 * aml,
                         u32 length,
                         u32 offset, u8 resource_index, void **context)
{
      struct acpi_resource **resource_ptr =
          ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
      struct acpi_resource *resource;
      acpi_status status;

      ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);

      /*
       * Check that the input buffer and all subsequent pointers into it
       * are aligned on a native word boundary. Most important on IA64
       */
      resource = *resource_ptr;
      if (ACPI_IS_MISALIGNED(resource)) {
            ACPI_WARNING((AE_INFO,
                        "Misaligned resource pointer %p", resource));
      }

      /* Convert the AML byte stream resource to a local resource struct */

      status =
          acpi_rs_convert_aml_to_resource(resource,
                                  ACPI_CAST_PTR(union aml_resource,
                                            aml),
                                  acpi_gbl_get_resource_dispatch
                                  [resource_index]);
      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status,
                        "Could not convert AML resource (Type %X)",
                        *aml));
            return_ACPI_STATUS(status);
      }

      ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
                    "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
                    acpi_ut_get_resource_type(aml), length,
                    resource->length));

      /* Point to the next structure in the output buffer */

      *resource_ptr = ACPI_ADD_PTR(void, resource, resource->length);
      return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_convert_resources_to_aml
 *
 * PARAMETERS:  Resource            - Pointer to the resource linked list
 *              aml_size_needed     - Calculated size of the byte stream
 *                                    needed from calling acpi_rs_get_aml_length()
 *                                    The size of the output_buffer is
 *                                    guaranteed to be >= aml_size_needed
 *              output_buffer       - Pointer to the buffer that will
 *                                    contain the byte stream
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Takes the resource linked list and parses it, creating a
 *              byte stream of resources in the caller's output buffer
 *
 ******************************************************************************/

acpi_status
acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
                         acpi_size aml_size_needed, u8 * output_buffer)
{
      u8 *aml = output_buffer;
      u8 *end_aml = output_buffer + aml_size_needed;
      acpi_status status;

      ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);

      /* Walk the resource descriptor list, convert each descriptor */

      while (aml < end_aml) {

            /* Validate the (internal) Resource Type */

            if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
                  ACPI_ERROR((AE_INFO,
                            "Invalid descriptor type (%X) in resource list",
                            resource->type));
                  return_ACPI_STATUS(AE_BAD_DATA);
            }

            /* Perform the conversion */

            status = acpi_rs_convert_resource_to_aml(resource, ACPI_CAST_PTR(union
                                                             aml_resource,
                                                             aml),
                                           acpi_gbl_set_resource_dispatch
                                           [resource->type]);
            if (ACPI_FAILURE(status)) {
                  ACPI_EXCEPTION((AE_INFO, status,
                              "Could not convert resource (type %X) to AML",
                              resource->type));
                  return_ACPI_STATUS(status);
            }

            /* Perform final sanity check on the new AML resource descriptor */

            status =
                acpi_ut_validate_resource(ACPI_CAST_PTR
                                    (union aml_resource, aml), NULL);
            if (ACPI_FAILURE(status)) {
                  return_ACPI_STATUS(status);
            }

            /* Check for end-of-list, normal exit */

            if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {

                  /* An End Tag indicates the end of the input Resource Template */

                  return_ACPI_STATUS(AE_OK);
            }

            /*
             * Extract the total length of the new descriptor and set the
             * Aml to point to the next (output) resource descriptor
             */
            aml += acpi_ut_get_descriptor_length(aml);

            /* Point to the next input resource descriptor */

            resource =
                ACPI_ADD_PTR(struct acpi_resource, resource,
                         resource->length);
      }

      /* Completed buffer, but did not find an end_tag resource descriptor */

      return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}

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