FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/compiler/aslpredef.c

     /******************************************************************************
      *
      * Module Name: aslpredef - support for ACPI predefined names
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, Intel Corp.
     * All rights reserved.
     *
     * 2. License
     *
     * 2.1. This is your license from Intel Corp. under its intellectual property
     * rights. You may have additional license terms from the party that provided
     * you this software, covering your right to use that party's intellectual
     * property rights.
     *
     * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
     * copy of the source code appearing in this file ("Covered Code") an
     * irrevocable, perpetual, worldwide license under Intel's copyrights in the
     * base code distributed originally by Intel ("Original Intel Code") to copy,
     * make derivatives, distribute, use and display any portion of the Covered
     * Code in any form, with the right to sublicense such rights; and
     *
     * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
     * license (with the right to sublicense), under only those claims of Intel
     * patents that are infringed by the Original Intel Code, to make, use, sell,
     * offer to sell, and import the Covered Code and derivative works thereof
     * solely to the minimum extent necessary to exercise the above copyright
     * license, and in no event shall the patent license extend to any additions
     * to or modifications of the Original Intel Code. No other license or right
     * is granted directly or by implication, estoppel or otherwise;
     *
     * The above copyright and patent license is granted only if the following
     * conditions are met:
     *
     * 3. Conditions
     *
     * 3.1. Redistribution of Source with Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification with rights to further distribute source must include
     * the above Copyright Notice, the above License, this list of Conditions,
     * and the following Disclaimer and Export Compliance provision. In addition,
     * Licensee must cause all Covered Code to which Licensee contributes to
     * contain a file documenting the changes Licensee made to create that Covered
     * Code and the date of any change. Licensee must include in that file the
     * documentation of any changes made by any predecessor Licensee. Licensee
     * must include a prominent statement that the modification is derived,
     * directly or indirectly, from Original Intel Code.
     *
     * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification without rights to further distribute source must
     * include the following Disclaimer and Export Compliance provision in the
     * documentation and/or other materials provided with distribution. In
     * addition, Licensee may not authorize further sublicense of source of any
     * portion of the Covered Code, and must include terms to the effect that the
     * license from Licensee to its licensee is limited to the intellectual
     * property embodied in the software Licensee provides to its licensee, and
     * not to intellectual property embodied in modifications its licensee may
     * make.
     *
     * 3.3. Redistribution of Executable. Redistribution in executable form of any
     * substantial portion of the Covered Code or modification must reproduce the
     * above Copyright Notice, and the following Disclaimer and Export Compliance
     * provision in the documentation and/or other materials provided with the
     * distribution.
     *
     * 3.4. Intel retains all right, title, and interest in and to the Original
     * Intel Code.
     *
     * 3.5. Neither the name Intel nor any other trademark owned or controlled by
     * Intel shall be used in advertising or otherwise to promote the sale, use or
     * other dealings in products derived from or relating to the Covered Code
     * without prior written authorization from Intel.
     *
     * 4. Disclaimer and Export Compliance
     *
     * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
     * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
     * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
     * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
     * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
     * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
     * PARTICULAR PURPOSE.
     *
     * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
     * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
     * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
     * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
     * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
     * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
     * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
     * LIMITED REMEDY.
     *
     * 4.3. Licensee shall not export, either directly or indirectly, any of this
    * software or system incorporating such software without first obtaining any
    * required license or other approval from the U. S. Department of Commerce or
    * any other agency or department of the United States Government. In the
    * event Licensee exports any such software from the United States or
    * re-exports any such software from a foreign destination, Licensee shall
    * ensure that the distribution and export/re-export of the software is in
    * compliance with all laws, regulations, orders, or other restrictions of the
    * U.S. Export Administration Regulations. Licensee agrees that neither it nor
    * any of its subsidiaries will export/re-export any technical data, process,
    * software, or service, directly or indirectly, to any country for which the
    * United States government or any agency thereof requires an export license,
    * other governmental approval, or letter of assurance, without first obtaining
    * such license, approval or letter.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * 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.
    *
    * 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 MERCHANTABILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * 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 DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #define ACPI_CREATE_PREDEFINED_TABLE
   #define ACPI_CREATE_RESOURCE_TABLE
   
   #include <contrib/dev/acpica/compiler/aslcompiler.h>
   #include "aslcompiler.y.h"
   #include <contrib/dev/acpica/include/acpredef.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   
   
   #define _COMPONENT          ACPI_COMPILER
           ACPI_MODULE_NAME    ("aslpredef")
   
   
   /* Local prototypes */
   
   static void
   ApCheckForUnexpectedReturnValue (
       ACPI_PARSE_OBJECT       *Op,
       ASL_METHOD_INFO         *MethodInfo);
   
   static UINT32
   ApCheckForSpecialName (
       ACPI_PARSE_OBJECT       *Op,
       char                    *Name);
   
   
   /*******************************************************************************
    *
    * FUNCTION:    ApCheckForPredefinedMethod
    *
    * PARAMETERS:  Op              - A parse node of type "METHOD".
    *              MethodInfo      - Saved info about this method
    *
    * RETURN:      None
    *
    * DESCRIPTION: If method is a predefined name, check that the number of
    *              arguments and the return type (returns a value or not)
    *              is correct.
    *
    ******************************************************************************/
   
   BOOLEAN
   ApCheckForPredefinedMethod (
       ACPI_PARSE_OBJECT       *Op,
       ASL_METHOD_INFO         *MethodInfo)
   {
       UINT32                      Index;
       UINT32                      RequiredArgCount;
       const ACPI_PREDEFINED_INFO  *ThisName;
   
   
       /* Check for a match against the predefined name list */
   
       Index = ApCheckForPredefinedName (Op, Op->Asl.NameSeg);
   
       switch (Index)
       {
       case ACPI_NOT_RESERVED_NAME:        /* No underscore or _Txx or _xxx name not matched */
       case ACPI_PREDEFINED_NAME:          /* Resource Name or reserved scope name */
       case ACPI_COMPILER_RESERVED_NAME:   /* A _Txx that was not emitted by compiler */
   
           /* Just return, nothing to do */
           return (FALSE);
   
   
       case ACPI_EVENT_RESERVED_NAME:      /* _Lxx/_Exx/_Wxx/_Qxx methods */
   
           AslGbl_ReservedMethods++;
   
           /* NumArguments must be zero for all _Lxx/_Exx/_Wxx/_Qxx methods */
   
           if (MethodInfo->NumArguments != 0)
           {
               sprintf (AslGbl_MsgBuffer, "%s requires %d", Op->Asl.ExternalName, 0);
   
               AslError (ASL_WARNING, ASL_MSG_RESERVED_ARG_COUNT_HI, Op,
                   AslGbl_MsgBuffer);
           }
           break;
   
   
       default:
           /*
            * Matched a predefined method name - validate the ASL-defined
            * argument count against the ACPI specification.
            *
            * Some methods are allowed to have a "minimum" number of args
            * (_SCP) because their definition in ACPI has changed over time.
            */
           AslGbl_ReservedMethods++;
           ThisName = &AcpiGbl_PredefinedMethods[Index];
           RequiredArgCount = METHOD_GET_ARG_COUNT (ThisName->Info.ArgumentList);
   
           if (MethodInfo->NumArguments != RequiredArgCount)
           {
               sprintf (AslGbl_MsgBuffer, "%4.4s requires %u",
                   ThisName->Info.Name, RequiredArgCount);
   
               if (MethodInfo->NumArguments < RequiredArgCount)
               {
                   AslError (ASL_WARNING, ASL_MSG_RESERVED_ARG_COUNT_LO, Op,
                       AslGbl_MsgBuffer);
               }
               else if ((MethodInfo->NumArguments > RequiredArgCount) &&
                   !(ThisName->Info.ArgumentList & ARG_COUNT_IS_MINIMUM))
               {
                   AslError (ASL_WARNING, ASL_MSG_RESERVED_ARG_COUNT_HI, Op,
                       AslGbl_MsgBuffer);
               }
           }
   
           /*
            * Check if method returns no value, but the predefined name is
            * required to return a value
            */
           if (MethodInfo->NumReturnNoValue &&
               ThisName->Info.ExpectedBtypes)
           {
               AcpiUtGetExpectedReturnTypes (AslGbl_StringBuffer,
                   ThisName->Info.ExpectedBtypes);
   
               sprintf (AslGbl_MsgBuffer, "%s required for %4.4s",
                   AslGbl_StringBuffer, ThisName->Info.Name);
   
               AslError (ASL_WARNING, ASL_MSG_RESERVED_RETURN_VALUE, Op,
                   AslGbl_MsgBuffer);
           }
           break;
       }
   
       return (TRUE);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    ApCheckForUnexpectedReturnValue
    *
    * PARAMETERS:  Op              - A parse node of type "RETURN".
    *              MethodInfo      - Saved info about this method
    *
    * RETURN:      None
    *
    * DESCRIPTION: Check for an unexpected return value from a predefined method.
    *              Invoked for predefined methods that are defined to not return
    *              any value. If there is a return value, issue a remark, since
    *              the ASL writer may be confused as to the method definition
    *              and/or functionality.
    *
    * Note: We ignore all return values of "Zero", since this is what a standalone
    *       Return() statement will always generate -- so we ignore it here --
    *       i.e., there is no difference between Return() and Return(Zero).
    *       Also, a null Return() will be disassembled to return(Zero) -- so, we
    *       don't want to generate extraneous remarks/warnings for a disassembled
    *       ASL file.
    *
    ******************************************************************************/
   
   static void
   ApCheckForUnexpectedReturnValue (
       ACPI_PARSE_OBJECT       *Op,
       ASL_METHOD_INFO         *MethodInfo)
   {
       ACPI_PARSE_OBJECT       *ReturnValueOp;
   
   
       /* Ignore Return() and Return(Zero) (they are the same) */
   
       ReturnValueOp = Op->Asl.Child;
       if (ReturnValueOp->Asl.ParseOpcode == PARSEOP_ZERO)
       {
           return;
       }
   
       /* We have a valid return value, but the reserved name did not expect it */
   
       AslError (ASL_WARNING, ASL_MSG_RESERVED_NO_RETURN_VAL,
           Op, MethodInfo->Op->Asl.ExternalName);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    ApCheckPredefinedReturnValue
    *
    * PARAMETERS:  Op              - A parse node of type "RETURN".
    *              MethodInfo      - Saved info about this method
    *
    * RETURN:      None
    *
    * DESCRIPTION: If method is a predefined name, attempt to validate the return
    *              value. Only "static" types can be validated - a simple return
    *              of an integer/string/buffer/package or a named reference to
    *              a static object. Values such as a Localx or Argx or a control
    *              method invocation are not checked. Issue a warning if there is
    *              a valid return value, but the reserved method defines no
    *              return value.
    *
    ******************************************************************************/
   
   void
   ApCheckPredefinedReturnValue (
       ACPI_PARSE_OBJECT       *Op,
       ASL_METHOD_INFO         *MethodInfo)
   {
       UINT32                      Index;
       ACPI_PARSE_OBJECT           *ReturnValueOp;
       const ACPI_PREDEFINED_INFO  *ThisName;
   
   
       /*
        * Check parent method for a match against the predefined name list.
        *
        * Note: Disable compiler errors/warnings because any errors will be
        * caught when analyzing the parent method. Eliminates duplicate errors.
        */
       AslGbl_AllExceptionsDisabled = TRUE;
       Index = ApCheckForPredefinedName (MethodInfo->Op,
           MethodInfo->Op->Asl.NameSeg);
       AslGbl_AllExceptionsDisabled = FALSE;
   
       switch (Index)
       {
       case ACPI_EVENT_RESERVED_NAME:      /* _Lxx/_Exx/_Wxx/_Qxx methods */
   
           /* No return value expected, warn if there is one */
   
           ApCheckForUnexpectedReturnValue (Op, MethodInfo);
           return;
   
       case ACPI_NOT_RESERVED_NAME:        /* No underscore or _Txx or _xxx name not matched */
       case ACPI_PREDEFINED_NAME:          /* Resource Name or reserved scope name */
       case ACPI_COMPILER_RESERVED_NAME:   /* A _Txx that was not emitted by compiler */
   
           /* Just return, nothing to do */
           return;
   
       default: /* A standard predefined ACPI name */
   
           ThisName = &AcpiGbl_PredefinedMethods[Index];
           if (!ThisName->Info.ExpectedBtypes)
           {
               /* No return value expected, warn if there is one */
   
               ApCheckForUnexpectedReturnValue (Op, MethodInfo);
               return;
           }
   
           /* Get the object returned, it is the next argument */
   
           ReturnValueOp = Op->Asl.Child;
           switch (ReturnValueOp->Asl.ParseOpcode)
           {
           case PARSEOP_ZERO:
           case PARSEOP_ONE:
           case PARSEOP_ONES:
           case PARSEOP_INTEGER:
           case PARSEOP_STRING_LITERAL:
           case PARSEOP_BUFFER:
           case PARSEOP_PACKAGE:
   
               /* Static data return object - check against expected type */
   
               ApCheckObjectType (ThisName->Info.Name, ReturnValueOp,
                   ThisName->Info.ExpectedBtypes, ACPI_NOT_PACKAGE_ELEMENT);
   
               /* For packages, check the individual package elements */
   
               if (ReturnValueOp->Asl.ParseOpcode == PARSEOP_PACKAGE)
               {
                   ApCheckPackage (ReturnValueOp, ThisName);
               }
               break;
   
           default:
               /*
                * All other ops are very difficult or impossible to typecheck at
                * compile time. These include all Localx, Argx, and method
                * invocations. Also, NAMESEG and NAMESTRING because the type of
                * any named object can be changed at runtime (for example,
                * CopyObject will change the type of the target object.)
                */
               break;
           }
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    ApCheckForPredefinedObject
    *
    * PARAMETERS:  Op              - A parse node
    *              Name            - The ACPI name to be checked
    *
    * RETURN:      None
    *
    * DESCRIPTION: Check for a predefined name for a static object (created via
    *              the ASL Name operator). If it is a predefined ACPI name, ensure
    *              that the name does not require any arguments (which would
    *              require a control method implementation of the name), and that
    *              the type of the object is one of the expected types for the
    *              predefined name.
    *
    ******************************************************************************/
   
   void
   ApCheckForPredefinedObject (
       ACPI_PARSE_OBJECT       *Op,
       char                    *Name)
   {
       UINT32                      Index;
       ACPI_PARSE_OBJECT           *ObjectOp;
       const ACPI_PREDEFINED_INFO  *ThisName;
   
   
       /*
        * Check for a real predefined name -- not a resource descriptor name
        * or a predefined scope name
        */
       Index = ApCheckForPredefinedName (Op, Name);
   
       switch (Index)
       {
       case ACPI_NOT_RESERVED_NAME:        /* No underscore or _Txx or _xxx name not matched */
       case ACPI_PREDEFINED_NAME:          /* Resource Name or reserved scope name */
       case ACPI_COMPILER_RESERVED_NAME:   /* A _Txx that was not emitted by compiler */
   
           /* Nothing to do */
           return;
   
       case ACPI_EVENT_RESERVED_NAME:      /* _Lxx/_Exx/_Wxx/_Qxx methods */
   
           /*
            * These names must be control methods, by definition in ACPI spec.
            * Also because they are defined to return no value. None of them
            * require any arguments.
            */
           AslError (ASL_ERROR, ASL_MSG_RESERVED_METHOD, Op,
               "with zero arguments");
           return;
   
       default:
   
           break;
       }
   
       /* A standard predefined ACPI name */
   
       /*
        * If this predefined name requires input arguments, then
        * it must be implemented as a control method
        */
       ThisName = &AcpiGbl_PredefinedMethods[Index];
       if (METHOD_GET_ARG_COUNT (ThisName->Info.ArgumentList) > 0)
       {
           AslError (ASL_ERROR, ASL_MSG_RESERVED_METHOD, Op,
               "with arguments");
           return;
       }
   
       /*
        * If no return value is expected from this predefined name, then
        * it follows that it must be implemented as a control method
        * (with zero args, because the args > 0 case was handled above)
        * Examples are: _DIS, _INI, _IRC, _OFF, _ON, _PSx
        */
       if (!ThisName->Info.ExpectedBtypes)
       {
           AslError (ASL_ERROR, ASL_MSG_RESERVED_METHOD, Op,
               "with zero arguments");
           return;
       }
   
       /* Typecheck the actual object, it is the next argument */
   
       ObjectOp = Op->Asl.Child->Asl.Next;
       ApCheckObjectType (ThisName->Info.Name, Op->Asl.Child->Asl.Next,
           ThisName->Info.ExpectedBtypes, ACPI_NOT_PACKAGE_ELEMENT);
   
       /* For packages, check the individual package elements */
   
       if (ObjectOp->Asl.ParseOpcode == PARSEOP_PACKAGE)
       {
           ApCheckPackage (ObjectOp, ThisName);
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    ApCheckForPredefinedName
    *
    * PARAMETERS:  Op              - A parse node
    *              Name            - NameSeg to check
    *
    * RETURN:      None
    *
    * DESCRIPTION: Check a NameSeg against the reserved list.
    *
    ******************************************************************************/
   
   UINT32
   ApCheckForPredefinedName (
       ACPI_PARSE_OBJECT       *Op,
       char                    *Name)
   {
       UINT32                      i;
       const ACPI_PREDEFINED_INFO  *ThisName;
   
   
       if (Name[0] == 0)
       {
           AslError (ASL_ERROR, ASL_MSG_COMPILER_INTERNAL, Op,
               "Zero length name found");
       }
   
       /* All reserved names are prefixed with a single underscore */
   
       if (Name[0] != '_')
       {
           return (ACPI_NOT_RESERVED_NAME);
       }
   
       /* Check for a standard predefined method name */
   
       ThisName = AcpiGbl_PredefinedMethods;
       for (i = 0; ThisName->Info.Name[0]; i++)
       {
           if (ACPI_COMPARE_NAMESEG (Name, ThisName->Info.Name))
           {
               /* Return index into predefined array */
               return (i);
           }
   
           ThisName++; /* Does not account for extra package data, but is OK */
       }
   
       /* Check for resource names and predefined scope names */
   
       ThisName = AcpiGbl_ResourceNames;
       while (ThisName->Info.Name[0])
       {
           if (ACPI_COMPARE_NAMESEG (Name, ThisName->Info.Name))
           {
               return (ACPI_PREDEFINED_NAME);
           }
   
           ThisName++;
       }
   
       ThisName = AcpiGbl_ScopeNames;
       while (ThisName->Info.Name[0])
       {
           if (ACPI_COMPARE_NAMESEG (Name, ThisName->Info.Name))
           {
               return (ACPI_PREDEFINED_NAME);
           }
   
           ThisName++;
       }
   
       /* Check for _Lxx/_Exx/_Wxx/_Qxx/_T_x. Warning if unknown predefined name */
   
       return (ApCheckForSpecialName (Op, Name));
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    ApCheckForSpecialName
    *
    * PARAMETERS:  Op              - A parse node
    *              Name            - NameSeg to check
    *
    * RETURN:      None
    *
    * DESCRIPTION: Check for the "special" predefined names -
    *              _Lxx, _Exx, _Qxx, _Wxx, and _T_x
    *
    ******************************************************************************/
   
   static UINT32
   ApCheckForSpecialName (
       ACPI_PARSE_OBJECT       *Op,
       char                    *Name)
   {
   
       /*
        * Check for the "special" predefined names. We already know that the
        * first character is an underscore.
        *   GPE:  _Lxx
        *   GPE:  _Exx
        *   GPE:  _Wxx
        *   EC:   _Qxx
        */
       if ((Name[1] == 'L') ||
           (Name[1] == 'E') ||
           (Name[1] == 'W') ||
           (Name[1] == 'Q'))
       {
           /* The next two characters must be hex digits */
   
           if ((isxdigit ((int) Name[2])) &&
               (isxdigit ((int) Name[3])))
           {
               return (ACPI_EVENT_RESERVED_NAME);
           }
       }
   
       /* Check for the names reserved for the compiler itself: _T_x */
   
       else if ((Op->Asl.ExternalName[1] == 'T') &&
                (Op->Asl.ExternalName[2] == '_'))
       {
           /* Ignore if actually emitted by the compiler */
   
           if (Op->Asl.CompileFlags & OP_COMPILER_EMITTED)
           {
               return (ACPI_NOT_RESERVED_NAME);
           }
   
           /*
            * Was not actually emitted by the compiler. This is a special case,
            * however. If the ASL code being compiled was the result of a
            * disassembly, it may possibly contain valid compiler-emitted names
            * of the form "_T_x". We don't want to issue an error or even a
            * warning and force the user to manually change the names. So, we
            * will issue a remark instead.
            */
           AslError (ASL_REMARK, ASL_MSG_COMPILER_RESERVED,
               Op, Op->Asl.ExternalName);
           return (ACPI_COMPILER_RESERVED_NAME);
       }
   
       /*
        * The name didn't match any of the known predefined names. Flag it as a
        * warning, since the entire namespace starting with an underscore is
        * reserved by the ACPI spec.
        */
       AslError (ASL_WARNING, ASL_MSG_UNKNOWN_RESERVED_NAME,
           Op, Op->Asl.ExternalName);
   
       return (ACPI_NOT_RESERVED_NAME);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    ApCheckObjectType
    *
    * PARAMETERS:  PredefinedName  - Name of the predefined object we are checking
    *              Op              - Current parse node
    *              ExpectedBtypes  - Bitmap of expected return type(s)
    *              PackageIndex    - Index of object within parent package (if
    *                                applicable - ACPI_NOT_PACKAGE_ELEMENT
    *                                otherwise)
    *
    * RETURN:      None
    *
    * DESCRIPTION: Check if the object type is one of the types that is expected
    *              by the predefined name. Only a limited number of object types
    *              can be returned by the predefined names.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   ApCheckObjectType (
       const char              *PredefinedName,
       ACPI_PARSE_OBJECT       *Op,
       UINT32                  ExpectedBtypes,
       UINT32                  PackageIndex)
   {
       UINT32                  ReturnBtype;
       char                    *TypeName;
   
   
       if (!Op)
       {
           return (AE_TYPE);
       }
   
       /* Map the parse opcode to a bitmapped return type (RTYPE) */
   
       switch (Op->Asl.ParseOpcode)
       {
       case PARSEOP_ZERO:
       case PARSEOP_ONE:
       case PARSEOP_ONES:
       case PARSEOP_INTEGER:
   
           ReturnBtype = ACPI_RTYPE_INTEGER;
           TypeName = "Integer";
           break;
   
       case PARSEOP_STRING_LITERAL:
   
           ReturnBtype = ACPI_RTYPE_STRING;
           TypeName = "String";
           break;
   
       case PARSEOP_BUFFER:
   
           ReturnBtype = ACPI_RTYPE_BUFFER;
           TypeName = "Buffer";
           break;
   
       case PARSEOP_PACKAGE:
       case PARSEOP_VAR_PACKAGE:
   
           ReturnBtype = ACPI_RTYPE_PACKAGE;
           TypeName = "Package";
           break;
   
       case PARSEOP_NAMESEG:
       case PARSEOP_NAMESTRING:
           /*
            * Ignore any named references within a package object.
            *
            * For Package objects, references are allowed instead of any of the
            * standard data types (Integer/String/Buffer/Package). These
            * references are resolved at runtime. NAMESEG and NAMESTRING are
            * impossible to typecheck at compile time because the type of
            * any named object can be changed at runtime (for example,
            * CopyObject will change the type of the target object).
            */
           if (PackageIndex != ACPI_NOT_PACKAGE_ELEMENT)
           {
               return (AE_OK);
           }
   
           ReturnBtype = ACPI_RTYPE_REFERENCE;
           TypeName = "Reference";
           break;
   
       default:
   
           /* Not one of the supported object types */
   
           TypeName = UtGetOpName (Op->Asl.ParseOpcode);
           goto TypeErrorExit;
       }
   
       /* Exit if the object is one of the expected types */
   
       if (ReturnBtype & ExpectedBtypes)
       {
           return (AE_OK);
       }
   
   
   TypeErrorExit:
   
       /* Format the expected types and emit an error message */
   
       AcpiUtGetExpectedReturnTypes (AslGbl_StringBuffer, ExpectedBtypes);
   
       if (PackageIndex == ACPI_NOT_PACKAGE_ELEMENT)
       {
           sprintf (AslGbl_MsgBuffer, "%4.4s: found %s, %s required",
               PredefinedName, TypeName, AslGbl_StringBuffer);
       }
       else
       {
           sprintf (AslGbl_MsgBuffer, "%4.4s: found %s at index %u, %s required",
               PredefinedName, TypeName, PackageIndex, AslGbl_StringBuffer);
       }
   
       AslError (ASL_ERROR, ASL_MSG_RESERVED_OPERAND_TYPE, Op, AslGbl_MsgBuffer);
       return (AE_TYPE);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    ApDisplayReservedNames
    *
    * PARAMETERS:  None
    *
    * RETURN:      None
    *
    * DESCRIPTION: Dump information about the ACPI predefined names and predefined
    *              resource descriptor names.
    *
    ******************************************************************************/
   
   void
   ApDisplayReservedNames (
       void)
   {
       const ACPI_PREDEFINED_INFO  *ThisName;
       UINT32                      Count;
       UINT32                      NumTypes;
   
   
       /*
        * Predefined names/methods
        */
       printf ("\nPredefined Name Information\n\n");
   
       Count = 0;
       ThisName = AcpiGbl_PredefinedMethods;
       while (ThisName->Info.Name[0])
       {
           AcpiUtDisplayPredefinedMethod (AslGbl_MsgBuffer, ThisName, FALSE);
           Count++;
           ThisName = AcpiUtGetNextPredefinedMethod (ThisName);
       }
   
       printf ("%u Predefined Names are recognized\n", Count);
   
       /*
        * Resource Descriptor names
        */
       printf ("\nPredefined Names for Resource Descriptor Fields\n\n");
   
       Count = 0;
       ThisName = AcpiGbl_ResourceNames;
       while (ThisName->Info.Name[0])
       {
           NumTypes = AcpiUtGetResourceBitWidth (AslGbl_MsgBuffer,
               ThisName->Info.ArgumentList);
   
           printf ("%4.4s    Field is %s bits wide%s\n",
               ThisName->Info.Name, AslGbl_MsgBuffer,
               (NumTypes > 1) ? " (depending on descriptor type)" : "");
   
           Count++;
           ThisName++;
       }
   
       printf ("%u Resource Descriptor Field Names are recognized\n", Count);
   
       /*
        * Predefined scope names
        */
       printf ("\nPredefined Scope/Device Names (automatically created at root)\n\n");
   
       ThisName = AcpiGbl_ScopeNames;
       while (ThisName->Info.Name[0])
       {
           printf ("%4.4s    Scope/Device\n", ThisName->Info.Name);
           ThisName++;
       }
   }

Cache object: 9be0532fc9e01ed5380af2cbc57f1c4d