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utresrc.c

/*******************************************************************************
 *
 * Module Name: utresrc - Resource managment 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/amlresrc.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utresrc")
#if defined(ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
/*
 * Strings used to decode resource descriptors.
 * Used by both the disasssembler and the debugger resource dump routines
 */
const char *acpi_gbl_bm_decode[] = {
      "NotBusMaster",
      "BusMaster"
};

const char *acpi_gbl_config_decode[] = {
      "0 - Good Configuration",
      "1 - Acceptable Configuration",
      "2 - Suboptimal Configuration",
      "3 - ***Invalid Configuration***",
};

const char *acpi_gbl_consume_decode[] = {
      "ResourceProducer",
      "ResourceConsumer"
};

const char *acpi_gbl_dec_decode[] = {
      "PosDecode",
      "SubDecode"
};

const char *acpi_gbl_he_decode[] = {
      "Level",
      "Edge"
};

const char *acpi_gbl_io_decode[] = {
      "Decode10",
      "Decode16"
};

const char *acpi_gbl_ll_decode[] = {
      "ActiveHigh",
      "ActiveLow"
};

const char *acpi_gbl_max_decode[] = {
      "MaxNotFixed",
      "MaxFixed"
};

const char *acpi_gbl_mem_decode[] = {
      "NonCacheable",
      "Cacheable",
      "WriteCombining",
      "Prefetchable"
};

const char *acpi_gbl_min_decode[] = {
      "MinNotFixed",
      "MinFixed"
};

const char *acpi_gbl_mtp_decode[] = {
      "AddressRangeMemory",
      "AddressRangeReserved",
      "AddressRangeACPI",
      "AddressRangeNVS"
};

const char *acpi_gbl_rng_decode[] = {
      "InvalidRanges",
      "NonISAOnlyRanges",
      "ISAOnlyRanges",
      "EntireRange"
};

const char *acpi_gbl_rw_decode[] = {
      "ReadOnly",
      "ReadWrite"
};

const char *acpi_gbl_shr_decode[] = {
      "Exclusive",
      "Shared"
};

const char *acpi_gbl_siz_decode[] = {
      "Transfer8",
      "Transfer8_16",
      "Transfer16",
      "InvalidSize"
};

const char *acpi_gbl_trs_decode[] = {
      "DenseTranslation",
      "SparseTranslation"
};

const char *acpi_gbl_ttp_decode[] = {
      "TypeStatic",
      "TypeTranslation"
};

const char *acpi_gbl_typ_decode[] = {
      "Compatibility",
      "TypeA",
      "TypeB",
      "TypeF"
};

#endif

/*
 * Base sizes of the raw AML resource descriptors, indexed by resource type.
 * Zero indicates a reserved (and therefore invalid) resource type.
 */
const u8 acpi_gbl_resource_aml_sizes[] = {
      /* Small descriptors */

      0,
      0,
      0,
      0,
      ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
      ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
      ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
      ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
      ACPI_AML_SIZE_SMALL(struct aml_resource_io),
      ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
      0,
      0,
      0,
      0,
      ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
      ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),

      /* Large descriptors */

      0,
      ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
      ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
      0,
      ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
      ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
      ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
      ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
      ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
      ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
      ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
      ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64)
};

/*
 * Resource types, used to validate the resource length field.
 * The length of fixed-length types must match exactly, variable
 * lengths must meet the minimum required length, etc.
 * Zero indicates a reserved (and therefore invalid) resource type.
 */
static const u8 acpi_gbl_resource_types[] = {
      /* Small descriptors */

      0,
      0,
      0,
      0,
      ACPI_SMALL_VARIABLE_LENGTH,
      ACPI_FIXED_LENGTH,
      ACPI_SMALL_VARIABLE_LENGTH,
      ACPI_FIXED_LENGTH,
      ACPI_FIXED_LENGTH,
      ACPI_FIXED_LENGTH,
      0,
      0,
      0,
      0,
      ACPI_VARIABLE_LENGTH,
      ACPI_FIXED_LENGTH,

      /* Large descriptors */

      0,
      ACPI_FIXED_LENGTH,
      ACPI_FIXED_LENGTH,
      0,
      ACPI_VARIABLE_LENGTH,
      ACPI_FIXED_LENGTH,
      ACPI_FIXED_LENGTH,
      ACPI_VARIABLE_LENGTH,
      ACPI_VARIABLE_LENGTH,
      ACPI_VARIABLE_LENGTH,
      ACPI_VARIABLE_LENGTH,
      ACPI_FIXED_LENGTH
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_walk_aml_resources
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource template
 *              aml_length      - Length of the entire template
 *              user_function   - Called once for each descriptor found. If
 *                                NULL, a pointer to the end_tag is returned
 *              Context         - Passed to user_function
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
 *              once for each resource found.
 *
 ******************************************************************************/

acpi_status
acpi_ut_walk_aml_resources(u8 * aml,
                     acpi_size aml_length,
                     acpi_walk_aml_callback user_function, void **context)
{
      acpi_status status;
      u8 *end_aml;
      u8 resource_index;
      u32 length;
      u32 offset = 0;

      ACPI_FUNCTION_TRACE(ut_walk_aml_resources);

      /* The absolute minimum resource template is one end_tag descriptor */

      if (aml_length < sizeof(struct aml_resource_end_tag)) {
            return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
      }

      /* Point to the end of the resource template buffer */

      end_aml = aml + aml_length;

      /* Walk the byte list, abort on any invalid descriptor type or length */

      while (aml < end_aml) {

            /* Validate the Resource Type and Resource Length */

            status = acpi_ut_validate_resource(aml, &resource_index);
            if (ACPI_FAILURE(status)) {
                  return_ACPI_STATUS(status);
            }

            /* Get the length of this descriptor */

            length = acpi_ut_get_descriptor_length(aml);

            /* Invoke the user function */

            if (user_function) {
                  status =
                      user_function(aml, length, offset, resource_index,
                                context);
                  if (ACPI_FAILURE(status)) {
                        return (status);
                  }
            }

            /* An end_tag descriptor terminates this resource template */

            if (acpi_ut_get_resource_type(aml) ==
                ACPI_RESOURCE_NAME_END_TAG) {
                  /*
                   * There must be at least one more byte in the buffer for
                   * the 2nd byte of the end_tag
                   */
                  if ((aml + 1) >= end_aml) {
                        return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
                  }

                  /* Return the pointer to the end_tag if requested */

                  if (!user_function) {
                        *context = aml;
                  }

                  /* Normal exit */

                  return_ACPI_STATUS(AE_OK);
            }

            aml += length;
            offset += length;
      }

      /* Did not find an end_tag descriptor */

      return (AE_AML_NO_RESOURCE_END_TAG);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_validate_resource
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *              return_index    - Where the resource index is returned. NULL
 *                                if the index is not required.
 *
 * RETURN:      Status, and optionally the Index into the global resource tables
 *
 * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
 *              Type and Resource Length. Returns an index into the global
 *              resource information/dispatch tables for later use.
 *
 ******************************************************************************/

acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index)
{
      u8 resource_type;
      u8 resource_index;
      acpi_rs_length resource_length;
      acpi_rs_length minimum_resource_length;

      ACPI_FUNCTION_ENTRY();

      /*
       * 1) Validate the resource_type field (Byte 0)
       */
      resource_type = ACPI_GET8(aml);

      /*
       * Byte 0 contains the descriptor name (Resource Type)
       * Examine the large/small bit in the resource header
       */
      if (resource_type & ACPI_RESOURCE_NAME_LARGE) {

            /* Verify the large resource type (name) against the max */

            if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
                  return (AE_AML_INVALID_RESOURCE_TYPE);
            }

            /*
             * Large Resource Type -- bits 6:0 contain the name
             * Translate range 0x80-0x8B to index range 0x10-0x1B
             */
            resource_index = (u8) (resource_type - 0x70);
      } else {
            /*
             * Small Resource Type -- bits 6:3 contain the name
             * Shift range to index range 0x00-0x0F
             */
            resource_index = (u8)
                ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
      }

      /* Check validity of the resource type, zero indicates name is invalid */

      if (!acpi_gbl_resource_types[resource_index]) {
            return (AE_AML_INVALID_RESOURCE_TYPE);
      }

      /*
       * 2) Validate the resource_length field. This ensures that the length
       *    is at least reasonable, and guarantees that it is non-zero.
       */
      resource_length = acpi_ut_get_resource_length(aml);
      minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];

      /* Validate based upon the type of resource - fixed length or variable */

      switch (acpi_gbl_resource_types[resource_index]) {
      case ACPI_FIXED_LENGTH:

            /* Fixed length resource, length must match exactly */

            if (resource_length != minimum_resource_length) {
                  return (AE_AML_BAD_RESOURCE_LENGTH);
            }
            break;

      case ACPI_VARIABLE_LENGTH:

            /* Variable length resource, length must be at least the minimum */

            if (resource_length < minimum_resource_length) {
                  return (AE_AML_BAD_RESOURCE_LENGTH);
            }
            break;

      case ACPI_SMALL_VARIABLE_LENGTH:

            /* Small variable length resource, length can be (Min) or (Min-1) */

            if ((resource_length > minimum_resource_length) ||
                (resource_length < (minimum_resource_length - 1))) {
                  return (AE_AML_BAD_RESOURCE_LENGTH);
            }
            break;

      default:

            /* Shouldn't happen (because of validation earlier), but be sure */

            return (AE_AML_INVALID_RESOURCE_TYPE);
      }

      /* Optionally return the resource table index */

      if (return_index) {
            *return_index = resource_index;
      }

      return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_type
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      The Resource Type with no extraneous bits (except the
 *              Large/Small descriptor bit -- this is left alone)
 *
 * DESCRIPTION: Extract the Resource Type/Name from the first byte of
 *              a resource descriptor.
 *
 ******************************************************************************/

u8 acpi_ut_get_resource_type(void *aml)
{
      ACPI_FUNCTION_ENTRY();

      /*
       * Byte 0 contains the descriptor name (Resource Type)
       * Examine the large/small bit in the resource header
       */
      if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {

            /* Large Resource Type -- bits 6:0 contain the name */

            return (ACPI_GET8(aml));
      } else {
            /* Small Resource Type -- bits 6:3 contain the name */

            return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
      }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_length
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      Byte Length
 *
 * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
 *              definition, this does not include the size of the descriptor
 *              header or the length field itself.
 *
 ******************************************************************************/

u16 acpi_ut_get_resource_length(void *aml)
{
      acpi_rs_length resource_length;

      ACPI_FUNCTION_ENTRY();

      /*
       * Byte 0 contains the descriptor name (Resource Type)
       * Examine the large/small bit in the resource header
       */
      if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {

            /* Large Resource type -- bytes 1-2 contain the 16-bit length */

            ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));

      } else {
            /* Small Resource type -- bits 2:0 of byte 0 contain the length */

            resource_length = (u16) (ACPI_GET8(aml) &
                               ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
      }

      return (resource_length);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_header_length
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      Length of the AML header (depends on large/small descriptor)
 *
 * DESCRIPTION: Get the length of the header for this resource.
 *
 ******************************************************************************/

u8 acpi_ut_get_resource_header_length(void *aml)
{
      ACPI_FUNCTION_ENTRY();

      /* Examine the large/small bit in the resource header */

      if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
            return (sizeof(struct aml_resource_large_header));
      } else {
            return (sizeof(struct aml_resource_small_header));
      }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_descriptor_length
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      Byte length
 *
 * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
 *              length of the descriptor header and the length field itself.
 *              Used to walk descriptor lists.
 *
 ******************************************************************************/

u32 acpi_ut_get_descriptor_length(void *aml)
{
      ACPI_FUNCTION_ENTRY();

      /*
       * Get the Resource Length (does not include header length) and add
       * the header length (depends on if this is a small or large resource)
       */
      return (acpi_ut_get_resource_length(aml) +
            acpi_ut_get_resource_header_length(aml));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_end_tag
 *
 * PARAMETERS:  obj_desc        - The resource template buffer object
 *              end_tag         - Where the pointer to the end_tag is returned
 *
 * RETURN:      Status, pointer to the end tag
 *
 * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
 *              Note: allows a buffer length of zero.
 *
 ******************************************************************************/

acpi_status
acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,
                       u8 ** end_tag)
{
      acpi_status status;

      ACPI_FUNCTION_TRACE(ut_get_resource_end_tag);

      /* Allow a buffer length of zero */

      if (!obj_desc->buffer.length) {
            *end_tag = obj_desc->buffer.pointer;
            return_ACPI_STATUS(AE_OK);
      }

      /* Validate the template and get a pointer to the end_tag */

      status = acpi_ut_walk_aml_resources(obj_desc->buffer.pointer,
                                  obj_desc->buffer.length, NULL,
                                  (void **)end_tag);

      return_ACPI_STATUS(status);
}

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