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  1. /*******************************************************************************
  2.  *
  3.  * Module Name: utresrc - Resource managment utilities
  4.  *
  5.  ******************************************************************************/
  6.  
  7. /******************************************************************************
  8.  *
  9.  * 1. Copyright Notice
  10.  *
  11.  * Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.
  12.  * All rights reserved.
  13.  *
  14.  * 2. License
  15.  *
  16.  * 2.1. This is your license from Intel Corp. under its intellectual property
  17.  * rights.  You may have additional license terms from the party that provided
  18.  * you this software, covering your right to use that party's intellectual
  19.  * property rights.
  20.  *
  21.  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  22.  * copy of the source code appearing in this file ("Covered Code") an
  23.  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  24.  * base code distributed originally by Intel ("Original Intel Code") to copy,
  25.  * make derivatives, distribute, use and display any portion of the Covered
  26.  * Code in any form, with the right to sublicense such rights; and
  27.  *
  28.  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  29.  * license (with the right to sublicense), under only those claims of Intel
  30.  * patents that are infringed by the Original Intel Code, to make, use, sell,
  31.  * offer to sell, and import the Covered Code and derivative works thereof
  32.  * solely to the minimum extent necessary to exercise the above copyright
  33.  * license, and in no event shall the patent license extend to any additions
  34.  * to or modifications of the Original Intel Code.  No other license or right
  35.  * is granted directly or by implication, estoppel or otherwise;
  36.  *
  37.  * The above copyright and patent license is granted only if the following
  38.  * conditions are met:
  39.  *
  40.  * 3. Conditions
  41.  *
  42.  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  43.  * Redistribution of source code of any substantial portion of the Covered
  44.  * Code or modification with rights to further distribute source must include
  45.  * the above Copyright Notice, the above License, this list of Conditions,
  46.  * and the following Disclaimer and Export Compliance provision.  In addition,
  47.  * Licensee must cause all Covered Code to which Licensee contributes to
  48.  * contain a file documenting the changes Licensee made to create that Covered
  49.  * Code and the date of any change.  Licensee must include in that file the
  50.  * documentation of any changes made by any predecessor Licensee.  Licensee
  51.  * must include a prominent statement that the modification is derived,
  52.  * directly or indirectly, from Original Intel Code.
  53.  *
  54.  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  55.  * Redistribution of source code of any substantial portion of the Covered
  56.  * Code or modification without rights to further distribute source must
  57.  * include the following Disclaimer and Export Compliance provision in the
  58.  * documentation and/or other materials provided with distribution.  In
  59.  * addition, Licensee may not authorize further sublicense of source of any
  60.  * portion of the Covered Code, and must include terms to the effect that the
  61.  * license from Licensee to its licensee is limited to the intellectual
  62.  * property embodied in the software Licensee provides to its licensee, and
  63.  * not to intellectual property embodied in modifications its licensee may
  64.  * make.
  65.  *
  66.  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  67.  * substantial portion of the Covered Code or modification must reproduce the
  68.  * above Copyright Notice, and the following Disclaimer and Export Compliance
  69.  * provision in the documentation and/or other materials provided with the
  70.  * distribution.
  71.  *
  72.  * 3.4. Intel retains all right, title, and interest in and to the Original
  73.  * Intel Code.
  74.  *
  75.  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  76.  * Intel shall be used in advertising or otherwise to promote the sale, use or
  77.  * other dealings in products derived from or relating to the Covered Code
  78.  * without prior written authorization from Intel.
  79.  *
  80.  * 4. Disclaimer and Export Compliance
  81.  *
  82.  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  83.  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  84.  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  85.  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  86.  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  87.  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  88.  * PARTICULAR PURPOSE.
  89.  *
  90.  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  91.  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  92.  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  93.  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  94.  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  95.  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  96.  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  97.  * LIMITED REMEDY.
  98.  *
  99.  * 4.3. Licensee shall not export, either directly or indirectly, any of this
  100.  * software or system incorporating such software without first obtaining any
  101.  * required license or other approval from the U. S. Department of Commerce or
  102.  * any other agency or department of the United States Government.  In the
  103.  * event Licensee exports any such software from the United States or
  104.  * re-exports any such software from a foreign destination, Licensee shall
  105.  * ensure that the distribution and export/re-export of the software is in
  106.  * compliance with all laws, regulations, orders, or other restrictions of the
  107.  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
  108.  * any of its subsidiaries will export/re-export any technical data, process,
  109.  * software, or service, directly or indirectly, to any country for which the
  110.  * United States government or any agency thereof requires an export license,
  111.  * other governmental approval, or letter of assurance, without first obtaining
  112.  * such license, approval or letter.
  113.  *
  114.  *****************************************************************************/
  115.  
  116.  
  117. #define __UTRESRC_C__
  118.  
  119. #include "acpi.h"
  120. #include "accommon.h"
  121. #include "amlresrc.h"
  122.  
  123.  
  124. #define _COMPONENT          ACPI_UTILITIES
  125.         ACPI_MODULE_NAME    ("utresrc")
  126.  
  127.  
  128. #if defined(ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
  129.  
  130. /*
  131.  * Strings used to decode resource descriptors.
  132.  * Used by both the disasssembler and the debugger resource dump routines
  133.  */
  134. const char                      *AcpiGbl_BmDecode[] =
  135. {
  136.     "NotBusMaster",
  137.     "BusMaster"
  138. };
  139.  
  140. const char                      *AcpiGbl_ConfigDecode[] =
  141. {
  142.     "0 - Good Configuration",
  143.     "1 - Acceptable Configuration",
  144.     "2 - Suboptimal Configuration",
  145.     "3 - ***Invalid Configuration***",
  146. };
  147.  
  148. const char                      *AcpiGbl_ConsumeDecode[] =
  149. {
  150.     "ResourceProducer",
  151.     "ResourceConsumer"
  152. };
  153.  
  154. const char                      *AcpiGbl_DecDecode[] =
  155. {
  156.     "PosDecode",
  157.     "SubDecode"
  158. };
  159.  
  160. const char                      *AcpiGbl_HeDecode[] =
  161. {
  162.     "Level",
  163.     "Edge"
  164. };
  165.  
  166. const char                      *AcpiGbl_IoDecode[] =
  167. {
  168.     "Decode10",
  169.     "Decode16"
  170. };
  171.  
  172. const char                      *AcpiGbl_LlDecode[] =
  173. {
  174.     "ActiveHigh",
  175.     "ActiveLow"
  176. };
  177.  
  178. const char                      *AcpiGbl_MaxDecode[] =
  179. {
  180.     "MaxNotFixed",
  181.     "MaxFixed"
  182. };
  183.  
  184. const char                      *AcpiGbl_MemDecode[] =
  185. {
  186.     "NonCacheable",
  187.     "Cacheable",
  188.     "WriteCombining",
  189.     "Prefetchable"
  190. };
  191.  
  192. const char                      *AcpiGbl_MinDecode[] =
  193. {
  194.     "MinNotFixed",
  195.     "MinFixed"
  196. };
  197.  
  198. const char                      *AcpiGbl_MtpDecode[] =
  199. {
  200.     "AddressRangeMemory",
  201.     "AddressRangeReserved",
  202.     "AddressRangeACPI",
  203.     "AddressRangeNVS"
  204. };
  205.  
  206. const char                      *AcpiGbl_RngDecode[] =
  207. {
  208.     "InvalidRanges",
  209.     "NonISAOnlyRanges",
  210.     "ISAOnlyRanges",
  211.     "EntireRange"
  212. };
  213.  
  214. const char                      *AcpiGbl_RwDecode[] =
  215. {
  216.     "ReadOnly",
  217.     "ReadWrite"
  218. };
  219.  
  220. const char                      *AcpiGbl_ShrDecode[] =
  221. {
  222.     "Exclusive",
  223.     "Shared"
  224. };
  225.  
  226. const char                      *AcpiGbl_SizDecode[] =
  227. {
  228.     "Transfer8",
  229.     "Transfer8_16",
  230.     "Transfer16",
  231.     "InvalidSize"
  232. };
  233.  
  234. const char                      *AcpiGbl_TrsDecode[] =
  235. {
  236.     "DenseTranslation",
  237.     "SparseTranslation"
  238. };
  239.  
  240. const char                      *AcpiGbl_TtpDecode[] =
  241. {
  242.     "TypeStatic",
  243.     "TypeTranslation"
  244. };
  245.  
  246. const char                      *AcpiGbl_TypDecode[] =
  247. {
  248.     "Compatibility",
  249.     "TypeA",
  250.     "TypeB",
  251.     "TypeF"
  252. };
  253.  
  254. #endif
  255.  
  256.  
  257. /*
  258.  * Base sizes of the raw AML resource descriptors, indexed by resource type.
  259.  * Zero indicates a reserved (and therefore invalid) resource type.
  260.  */
  261. const UINT8                 AcpiGbl_ResourceAmlSizes[] =
  262. {
  263.     /* Small descriptors */
  264.  
  265.     0,
  266.     0,
  267.     0,
  268.     0,
  269.     ACPI_AML_SIZE_SMALL (AML_RESOURCE_IRQ),
  270.     ACPI_AML_SIZE_SMALL (AML_RESOURCE_DMA),
  271.     ACPI_AML_SIZE_SMALL (AML_RESOURCE_START_DEPENDENT),
  272.     ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_DEPENDENT),
  273.     ACPI_AML_SIZE_SMALL (AML_RESOURCE_IO),
  274.     ACPI_AML_SIZE_SMALL (AML_RESOURCE_FIXED_IO),
  275.     0,
  276.     0,
  277.     0,
  278.     0,
  279.     ACPI_AML_SIZE_SMALL (AML_RESOURCE_VENDOR_SMALL),
  280.     ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_TAG),
  281.  
  282.     /* Large descriptors */
  283.  
  284.     0,
  285.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY24),
  286.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_GENERIC_REGISTER),
  287.     0,
  288.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_VENDOR_LARGE),
  289.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY32),
  290.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_FIXED_MEMORY32),
  291.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS32),
  292.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS16),
  293.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_IRQ),
  294.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS64),
  295.     ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_ADDRESS64)
  296. };
  297.  
  298.  
  299. /*
  300.  * Resource types, used to validate the resource length field.
  301.  * The length of fixed-length types must match exactly, variable
  302.  * lengths must meet the minimum required length, etc.
  303.  * Zero indicates a reserved (and therefore invalid) resource type.
  304.  */
  305. static const UINT8          AcpiGbl_ResourceTypes[] =
  306. {
  307.     /* Small descriptors */
  308.  
  309.     0,
  310.     0,
  311.     0,
  312.     0,
  313.     ACPI_SMALL_VARIABLE_LENGTH,
  314.     ACPI_FIXED_LENGTH,
  315.     ACPI_SMALL_VARIABLE_LENGTH,
  316.     ACPI_FIXED_LENGTH,
  317.     ACPI_FIXED_LENGTH,
  318.     ACPI_FIXED_LENGTH,
  319.     0,
  320.     0,
  321.     0,
  322.     0,
  323.     ACPI_VARIABLE_LENGTH,
  324.     ACPI_FIXED_LENGTH,
  325.  
  326.     /* Large descriptors */
  327.  
  328.     0,
  329.     ACPI_FIXED_LENGTH,
  330.     ACPI_FIXED_LENGTH,
  331.     0,
  332.     ACPI_VARIABLE_LENGTH,
  333.     ACPI_FIXED_LENGTH,
  334.     ACPI_FIXED_LENGTH,
  335.     ACPI_VARIABLE_LENGTH,
  336.     ACPI_VARIABLE_LENGTH,
  337.     ACPI_VARIABLE_LENGTH,
  338.     ACPI_VARIABLE_LENGTH,
  339.     ACPI_FIXED_LENGTH
  340. };
  341.  
  342.  
  343. /*******************************************************************************
  344.  *
  345.  * FUNCTION:    AcpiUtWalkAmlResources
  346.  *
  347.  * PARAMETERS:  Aml             - Pointer to the raw AML resource template
  348.  *              AmlLength       - Length of the entire template
  349.  *              UserFunction    - Called once for each descriptor found. If
  350.  *                                NULL, a pointer to the EndTag is returned
  351.  *              Context         - Passed to UserFunction
  352.  *
  353.  * RETURN:      Status
  354.  *
  355.  * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
  356.  *              once for each resource found.
  357.  *
  358.  ******************************************************************************/
  359.  
  360. ACPI_STATUS
  361. AcpiUtWalkAmlResources (
  362.     UINT8                   *Aml,
  363.     ACPI_SIZE               AmlLength,
  364.     ACPI_WALK_AML_CALLBACK  UserFunction,
  365.     void                    *Context)
  366. {
  367.     ACPI_STATUS             Status;
  368.     UINT8                   *EndAml;
  369.     UINT8                   ResourceIndex;
  370.     UINT32                  Length;
  371.     UINT32                  Offset = 0;
  372.  
  373.  
  374.     ACPI_FUNCTION_TRACE (UtWalkAmlResources);
  375.  
  376.  
  377.     /* The absolute minimum resource template is one EndTag descriptor */
  378.  
  379.     if (AmlLength < sizeof (AML_RESOURCE_END_TAG))
  380.     {
  381.         return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
  382.     }
  383.  
  384.     /* Point to the end of the resource template buffer */
  385.  
  386.     EndAml = Aml + AmlLength;
  387.  
  388.     /* Walk the byte list, abort on any invalid descriptor type or length */
  389.  
  390.     while (Aml < EndAml)
  391.     {
  392.         /* Validate the Resource Type and Resource Length */
  393.  
  394.         Status = AcpiUtValidateResource (Aml, &ResourceIndex);
  395.         if (ACPI_FAILURE (Status))
  396.         {
  397.             return_ACPI_STATUS (Status);
  398.         }
  399.  
  400.         /* Get the length of this descriptor */
  401.  
  402.         Length = AcpiUtGetDescriptorLength (Aml);
  403.  
  404.         /* Invoke the user function */
  405.  
  406.         if (UserFunction)
  407.         {
  408.             Status = UserFunction (Aml, Length, Offset, ResourceIndex, Context);
  409.             if (ACPI_FAILURE (Status))
  410.             {
  411.                 return (Status);
  412.             }
  413.         }
  414.  
  415.         /* An EndTag descriptor terminates this resource template */
  416.  
  417.         if (AcpiUtGetResourceType (Aml) == ACPI_RESOURCE_NAME_END_TAG)
  418.         {
  419.             /*
  420.              * There must be at least one more byte in the buffer for
  421.              * the 2nd byte of the EndTag
  422.              */
  423.             if ((Aml + 1) >= EndAml)
  424.             {
  425.                 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
  426.             }
  427.  
  428.             /* Return the pointer to the EndTag if requested */
  429.  
  430.             if (!UserFunction)
  431.             {
  432.                 *(void **) Context = Aml;
  433.             }
  434.  
  435.             /* Normal exit */
  436.  
  437.             return_ACPI_STATUS (AE_OK);
  438.         }
  439.  
  440.         Aml += Length;
  441.         Offset += Length;
  442.     }
  443.  
  444.     /* Did not find an EndTag descriptor */
  445.  
  446.     return (AE_AML_NO_RESOURCE_END_TAG);
  447. }
  448.  
  449.  
  450. /*******************************************************************************
  451.  *
  452.  * FUNCTION:    AcpiUtValidateResource
  453.  *
  454.  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
  455.  *              ReturnIndex     - Where the resource index is returned. NULL
  456.  *                                if the index is not required.
  457.  *
  458.  * RETURN:      Status, and optionally the Index into the global resource tables
  459.  *
  460.  * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
  461.  *              Type and Resource Length. Returns an index into the global
  462.  *              resource information/dispatch tables for later use.
  463.  *
  464.  ******************************************************************************/
  465.  
  466. ACPI_STATUS
  467. AcpiUtValidateResource (
  468.     void                    *Aml,
  469.     UINT8                   *ReturnIndex)
  470. {
  471.     UINT8                   ResourceType;
  472.     UINT8                   ResourceIndex;
  473.     ACPI_RS_LENGTH          ResourceLength;
  474.     ACPI_RS_LENGTH          MinimumResourceLength;
  475.  
  476.  
  477.     ACPI_FUNCTION_ENTRY ();
  478.  
  479.  
  480.     /*
  481.      * 1) Validate the ResourceType field (Byte 0)
  482.      */
  483.     ResourceType = ACPI_GET8 (Aml);
  484.  
  485.     /*
  486.      * Byte 0 contains the descriptor name (Resource Type)
  487.      * Examine the large/small bit in the resource header
  488.      */
  489.     if (ResourceType & ACPI_RESOURCE_NAME_LARGE)
  490.     {
  491.         /* Verify the large resource type (name) against the max */
  492.  
  493.         if (ResourceType > ACPI_RESOURCE_NAME_LARGE_MAX)
  494.         {
  495.             return (AE_AML_INVALID_RESOURCE_TYPE);
  496.         }
  497.  
  498.         /*
  499.          * Large Resource Type -- bits 6:0 contain the name
  500.          * Translate range 0x80-0x8B to index range 0x10-0x1B
  501.          */
  502.         ResourceIndex = (UINT8) (ResourceType - 0x70);
  503.     }
  504.     else
  505.     {
  506.         /*
  507.          * Small Resource Type -- bits 6:3 contain the name
  508.          * Shift range to index range 0x00-0x0F
  509.          */
  510.         ResourceIndex = (UINT8)
  511.             ((ResourceType & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
  512.     }
  513.  
  514.     /* Check validity of the resource type, zero indicates name is invalid */
  515.  
  516.     if (!AcpiGbl_ResourceTypes[ResourceIndex])
  517.     {
  518.         return (AE_AML_INVALID_RESOURCE_TYPE);
  519.     }
  520.  
  521.  
  522.     /*
  523.      * 2) Validate the ResourceLength field. This ensures that the length
  524.      *    is at least reasonable, and guarantees that it is non-zero.
  525.      */
  526.     ResourceLength = AcpiUtGetResourceLength (Aml);
  527.     MinimumResourceLength = AcpiGbl_ResourceAmlSizes[ResourceIndex];
  528.  
  529.     /* Validate based upon the type of resource - fixed length or variable */
  530.  
  531.     switch (AcpiGbl_ResourceTypes[ResourceIndex])
  532.     {
  533.     case ACPI_FIXED_LENGTH:
  534.  
  535.         /* Fixed length resource, length must match exactly */
  536.  
  537.         if (ResourceLength != MinimumResourceLength)
  538.         {
  539.             return (AE_AML_BAD_RESOURCE_LENGTH);
  540.         }
  541.         break;
  542.  
  543.     case ACPI_VARIABLE_LENGTH:
  544.  
  545.         /* Variable length resource, length must be at least the minimum */
  546.  
  547.         if (ResourceLength < MinimumResourceLength)
  548.         {
  549.             return (AE_AML_BAD_RESOURCE_LENGTH);
  550.         }
  551.         break;
  552.  
  553.     case ACPI_SMALL_VARIABLE_LENGTH:
  554.  
  555.         /* Small variable length resource, length can be (Min) or (Min-1) */
  556.  
  557.         if ((ResourceLength > MinimumResourceLength) ||
  558.             (ResourceLength < (MinimumResourceLength - 1)))
  559.         {
  560.             return (AE_AML_BAD_RESOURCE_LENGTH);
  561.         }
  562.         break;
  563.  
  564.     default:
  565.  
  566.         /* Shouldn't happen (because of validation earlier), but be sure */
  567.  
  568.         return (AE_AML_INVALID_RESOURCE_TYPE);
  569.     }
  570.  
  571.     /* Optionally return the resource table index */
  572.  
  573.     if (ReturnIndex)
  574.     {
  575.         *ReturnIndex = ResourceIndex;
  576.     }
  577.  
  578.     return (AE_OK);
  579. }
  580.  
  581.  
  582. /*******************************************************************************
  583.  *
  584.  * FUNCTION:    AcpiUtGetResourceType
  585.  *
  586.  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
  587.  *
  588.  * RETURN:      The Resource Type with no extraneous bits (except the
  589.  *              Large/Small descriptor bit -- this is left alone)
  590.  *
  591.  * DESCRIPTION: Extract the Resource Type/Name from the first byte of
  592.  *              a resource descriptor.
  593.  *
  594.  ******************************************************************************/
  595.  
  596. UINT8
  597. AcpiUtGetResourceType (
  598.     void                    *Aml)
  599. {
  600.     ACPI_FUNCTION_ENTRY ();
  601.  
  602.  
  603.     /*
  604.      * Byte 0 contains the descriptor name (Resource Type)
  605.      * Examine the large/small bit in the resource header
  606.      */
  607.     if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
  608.     {
  609.         /* Large Resource Type -- bits 6:0 contain the name */
  610.  
  611.         return (ACPI_GET8 (Aml));
  612.     }
  613.     else
  614.     {
  615.         /* Small Resource Type -- bits 6:3 contain the name */
  616.  
  617.         return ((UINT8) (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
  618.     }
  619. }
  620.  
  621.  
  622. /*******************************************************************************
  623.  *
  624.  * FUNCTION:    AcpiUtGetResourceLength
  625.  *
  626.  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
  627.  *
  628.  * RETURN:      Byte Length
  629.  *
  630.  * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
  631.  *              definition, this does not include the size of the descriptor
  632.  *              header or the length field itself.
  633.  *
  634.  ******************************************************************************/
  635.  
  636. UINT16
  637. AcpiUtGetResourceLength (
  638.     void                    *Aml)
  639. {
  640.     ACPI_RS_LENGTH          ResourceLength;
  641.  
  642.  
  643.     ACPI_FUNCTION_ENTRY ();
  644.  
  645.  
  646.     /*
  647.      * Byte 0 contains the descriptor name (Resource Type)
  648.      * Examine the large/small bit in the resource header
  649.      */
  650.     if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
  651.     {
  652.         /* Large Resource type -- bytes 1-2 contain the 16-bit length */
  653.  
  654.         ACPI_MOVE_16_TO_16 (&ResourceLength, ACPI_ADD_PTR (UINT8, Aml, 1));
  655.  
  656.     }
  657.     else
  658.     {
  659.         /* Small Resource type -- bits 2:0 of byte 0 contain the length */
  660.  
  661.         ResourceLength = (UINT16) (ACPI_GET8 (Aml) &
  662.                                     ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
  663.     }
  664.  
  665.     return (ResourceLength);
  666. }
  667.  
  668.  
  669. /*******************************************************************************
  670.  *
  671.  * FUNCTION:    AcpiUtGetResourceHeaderLength
  672.  *
  673.  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
  674.  *
  675.  * RETURN:      Length of the AML header (depends on large/small descriptor)
  676.  *
  677.  * DESCRIPTION: Get the length of the header for this resource.
  678.  *
  679.  ******************************************************************************/
  680.  
  681. UINT8
  682. AcpiUtGetResourceHeaderLength (
  683.     void                    *Aml)
  684. {
  685.     ACPI_FUNCTION_ENTRY ();
  686.  
  687.  
  688.     /* Examine the large/small bit in the resource header */
  689.  
  690.     if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
  691.     {
  692.         return (sizeof (AML_RESOURCE_LARGE_HEADER));
  693.     }
  694.     else
  695.     {
  696.         return (sizeof (AML_RESOURCE_SMALL_HEADER));
  697.     }
  698. }
  699.  
  700.  
  701. /*******************************************************************************
  702.  *
  703.  * FUNCTION:    AcpiUtGetDescriptorLength
  704.  *
  705.  * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
  706.  *
  707.  * RETURN:      Byte length
  708.  *
  709.  * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
  710.  *              length of the descriptor header and the length field itself.
  711.  *              Used to walk descriptor lists.
  712.  *
  713.  ******************************************************************************/
  714.  
  715. UINT32
  716. AcpiUtGetDescriptorLength (
  717.     void                    *Aml)
  718. {
  719.     ACPI_FUNCTION_ENTRY ();
  720.  
  721.  
  722.     /*
  723.      * Get the Resource Length (does not include header length) and add
  724.      * the header length (depends on if this is a small or large resource)
  725.      */
  726.     return (AcpiUtGetResourceLength (Aml) +
  727.             AcpiUtGetResourceHeaderLength (Aml));
  728. }
  729.  
  730.  
  731. /*******************************************************************************
  732.  *
  733.  * FUNCTION:    AcpiUtGetResourceEndTag
  734.  *
  735.  * PARAMETERS:  ObjDesc         - The resource template buffer object
  736.  *              EndTag          - Where the pointer to the EndTag is returned
  737.  *
  738.  * RETURN:      Status, pointer to the end tag
  739.  *
  740.  * DESCRIPTION: Find the EndTag resource descriptor in an AML resource template
  741.  *              Note: allows a buffer length of zero.
  742.  *
  743.  ******************************************************************************/
  744.  
  745. ACPI_STATUS
  746. AcpiUtGetResourceEndTag (
  747.     ACPI_OPERAND_OBJECT     *ObjDesc,
  748.     UINT8                   **EndTag)
  749. {
  750.     ACPI_STATUS             Status;
  751.  
  752.  
  753.     ACPI_FUNCTION_TRACE (UtGetResourceEndTag);
  754.  
  755.  
  756.     /* Allow a buffer length of zero */
  757.  
  758.     if (!ObjDesc->Buffer.Length)
  759.     {
  760.         *EndTag = ObjDesc->Buffer.Pointer;
  761.         return_ACPI_STATUS (AE_OK);
  762.     }
  763.  
  764.     /* Validate the template and get a pointer to the EndTag */
  765.  
  766.     Status = AcpiUtWalkAmlResources (ObjDesc->Buffer.Pointer,
  767.                 ObjDesc->Buffer.Length, NULL, EndTag);
  768.  
  769.     return_ACPI_STATUS (Status);
  770. }
  771.  
  772.  
  773.