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 /******************************************************************************
  *
  * Module Name: exutils - interpreter/scanner utilities
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2009, 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.
  *
  *****************************************************************************/
 
 #define __EXUTILS_C__
 
 /*
  * DEFINE_AML_GLOBALS is tested in amlcode.h
  * to determine whether certain global names should be "defined" or only
  * "declared" in the current compilation.  This enhances maintainability
  * by enabling a single header file to embody all knowledge of the names
  * in question.
  *
  * Exactly one module of any executable should #define DEFINE_GLOBALS
  * before #including the header files which use this convention.  The
  * names in question will be defined and initialized in that module,
  * and declared as extern in all other modules which #include those
  * header files.
  */
 
 #define DEFINE_AML_GLOBALS
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acinterp.h"
 #include "amlcode.h"
 
 #define _COMPONENT          ACPI_EXECUTER
         ACPI_MODULE_NAME    ("exutils")
 
 /* Local prototypes */
 
 static UINT32
 AcpiExDigitsNeeded (
     ACPI_INTEGER            Value,
     UINT32                  Base);
 
 
 #ifndef ACPI_NO_METHOD_EXECUTION
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExEnterInterpreter
  *
  * PARAMETERS:  None
  *
  * RETURN:      None
  *
  * DESCRIPTION: Enter the interpreter execution region. Failure to enter
  *              the interpreter region is a fatal system error. Used in
  *              conjunction with ExitInterpreter.
  *
  ******************************************************************************/
 
 void
 AcpiExEnterInterpreter (
     void)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (ExEnterInterpreter);
 
 
     Status = AcpiUtAcquireMutex (ACPI_MTX_INTERPRETER);
     if (ACPI_FAILURE (Status))
     {
         ACPI_ERROR ((AE_INFO, "Could not acquire AML Interpreter mutex"));
     }
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExReacquireInterpreter
  *
  * PARAMETERS:  None
  *
  * RETURN:      None
  *
  * DESCRIPTION: Reacquire the interpreter execution region from within the
  *              interpreter code. Failure to enter the interpreter region is a
  *              fatal system error. Used in  conjuction with
  *              RelinquishInterpreter
  *
  ******************************************************************************/
 
 void
 AcpiExReacquireInterpreter (
     void)
 {
     ACPI_FUNCTION_TRACE (ExReacquireInterpreter);
 
 
     /*
      * If the global serialized flag is set, do not release the interpreter,
      * since it was not actually released by AcpiExRelinquishInterpreter.
      * This forces the interpreter to be single threaded.
      */
     if (!AcpiGbl_AllMethodsSerialized)
     {
         AcpiExEnterInterpreter ();
     }
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExExitInterpreter
  *
  * PARAMETERS:  None
  *
  * RETURN:      None
  *
  * DESCRIPTION: Exit the interpreter execution region. This is the top level
  *              routine used to exit the interpreter when all processing has
  *              been completed.
  *
  ******************************************************************************/
 
 void
 AcpiExExitInterpreter (
     void)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (ExExitInterpreter);
 
 
     Status = AcpiUtReleaseMutex (ACPI_MTX_INTERPRETER);
     if (ACPI_FAILURE (Status))
     {
         ACPI_ERROR ((AE_INFO, "Could not release AML Interpreter mutex"));
     }
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExRelinquishInterpreter
  *
  * PARAMETERS:  None
  *
  * RETURN:      None
  *
  * DESCRIPTION: Exit the interpreter execution region, from within the
  *              interpreter - before attempting an operation that will possibly
  *              block the running thread.
  *
  * Cases where the interpreter is unlocked internally
  *      1) Method to be blocked on a Sleep() AML opcode
  *      2) Method to be blocked on an Acquire() AML opcode
  *      3) Method to be blocked on a Wait() AML opcode
  *      4) Method to be blocked to acquire the global lock
  *      5) Method to be blocked waiting to execute a serialized control method
  *          that is currently executing
  *      6) About to invoke a user-installed opregion handler
  *
  ******************************************************************************/
 
 void
 AcpiExRelinquishInterpreter (
     void)
 {
     ACPI_FUNCTION_TRACE (ExRelinquishInterpreter);
 
 
     /*
      * If the global serialized flag is set, do not release the interpreter.
      * This forces the interpreter to be single threaded.
      */
     if (!AcpiGbl_AllMethodsSerialized)
     {
         AcpiExExitInterpreter ();
     }
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExTruncateFor32bitTable
  *
  * PARAMETERS:  ObjDesc         - Object to be truncated
  *
  * RETURN:      none
  *
  * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is
  *              32-bit, as determined by the revision of the DSDT.
  *
  ******************************************************************************/
 
 void
 AcpiExTruncateFor32bitTable (
     ACPI_OPERAND_OBJECT     *ObjDesc)
 {
 
     ACPI_FUNCTION_ENTRY ();
 
 
     /*
      * Object must be a valid number and we must be executing
      * a control method. NS node could be there for AML_INT_NAMEPATH_OP.
      */
     if ((!ObjDesc) ||
         (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc) != ACPI_DESC_TYPE_OPERAND) ||
         (ObjDesc->Common.Type != ACPI_TYPE_INTEGER))
     {
         return;
     }
 
     if (AcpiGbl_IntegerByteWidth == 4)
     {
         /*
          * We are running a method that exists in a 32-bit ACPI table.
          * Truncate the value to 32 bits by zeroing out the upper 32-bit field
          */
         ObjDesc->Integer.Value &= (ACPI_INTEGER) ACPI_UINT32_MAX;
     }
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExAcquireGlobalLock
  *
  * PARAMETERS:  FieldFlags            - Flags with Lock rule:
  *                                      AlwaysLock or NeverLock
  *
  * RETURN:      None
  *
  * DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field
  *              flags specifiy that it is to be obtained before field access.
  *
  ******************************************************************************/
 
 void
 AcpiExAcquireGlobalLock (
     UINT32                  FieldFlags)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (ExAcquireGlobalLock);
 
 
     /* Only use the lock if the AlwaysLock bit is set */
 
     if (!(FieldFlags & AML_FIELD_LOCK_RULE_MASK))
     {
         return_VOID;
     }
 
     /* Attempt to get the global lock, wait forever */
 
     Status = AcpiExAcquireMutexObject (ACPI_WAIT_FOREVER,
                 AcpiGbl_GlobalLockMutex, AcpiOsGetThreadId ());
 
     if (ACPI_FAILURE (Status))
     {
         ACPI_EXCEPTION ((AE_INFO, Status,
             "Could not acquire Global Lock"));
     }
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExReleaseGlobalLock
  *
  * PARAMETERS:  FieldFlags            - Flags with Lock rule:
  *                                      AlwaysLock or NeverLock
  *
  * RETURN:      None
  *
  * DESCRIPTION: Release the ACPI hardware Global Lock
  *
  ******************************************************************************/
 
 void
 AcpiExReleaseGlobalLock (
     UINT32                  FieldFlags)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (ExReleaseGlobalLock);
 
 
     /* Only use the lock if the AlwaysLock bit is set */
 
     if (!(FieldFlags & AML_FIELD_LOCK_RULE_MASK))
     {
         return_VOID;
     }
 
     /* Release the global lock */
 
     Status = AcpiExReleaseMutexObject (AcpiGbl_GlobalLockMutex);
     if (ACPI_FAILURE (Status))
     {
         /* Report the error, but there isn't much else we can do */
 
         ACPI_EXCEPTION ((AE_INFO, Status,
             "Could not release Global Lock"));
     }
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExDigitsNeeded
  *
  * PARAMETERS:  Value           - Value to be represented
  *              Base            - Base of representation
  *
  * RETURN:      The number of digits.
  *
  * DESCRIPTION: Calculate the number of digits needed to represent the Value
  *              in the given Base (Radix)
  *
  ******************************************************************************/
 
 static UINT32
 AcpiExDigitsNeeded (
     ACPI_INTEGER            Value,
     UINT32                  Base)
 {
     UINT32                  NumDigits;
     ACPI_INTEGER            CurrentValue;
 
 
     ACPI_FUNCTION_TRACE (ExDigitsNeeded);
 
 
     /* ACPI_INTEGER is unsigned, so we don't worry about a '-' prefix */
 
     if (Value == 0)
     {
         return_UINT32 (1);
     }
 
     CurrentValue = Value;
     NumDigits = 0;
 
     /* Count the digits in the requested base */
 
     while (CurrentValue)
     {
         (void) AcpiUtShortDivide (CurrentValue, Base, &CurrentValue, NULL);
         NumDigits++;
     }
 
     return_UINT32 (NumDigits);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExEisaIdToString
  *
  * PARAMETERS:  CompressedId    - EISAID to be converted
  *              OutString       - Where to put the converted string (8 bytes)
  *
  * RETURN:      None
  *
  * DESCRIPTION: Convert a numeric EISAID to string representation. Return
  *              buffer must be large enough to hold the string. The string
  *              returned is always exactly of length ACPI_EISAID_STRING_SIZE
  *              (includes null terminator). The EISAID is always 32 bits.
  *
  ******************************************************************************/
 
 void
 AcpiExEisaIdToString (
     char                    *OutString,
     ACPI_INTEGER            CompressedId)
 {
     UINT32                  SwappedId;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     /* The EISAID should be a 32-bit integer */
 
     if (CompressedId > ACPI_UINT32_MAX)
     {
         ACPI_WARNING ((AE_INFO,
             "Expected EISAID is larger than 32 bits: 0x%8.8X%8.8X, truncating",
             ACPI_FORMAT_UINT64 (CompressedId)));
     }
 
     /* Swap ID to big-endian to get contiguous bits */
 
     SwappedId = AcpiUtDwordByteSwap ((UINT32) CompressedId);
 
     /* First 3 bytes are uppercase letters. Next 4 bytes are hexadecimal */
 
     OutString[0] = (char) (0x40 + (((unsigned long) SwappedId >> 26) & 0x1F));
     OutString[1] = (char) (0x40 + ((SwappedId >> 21) & 0x1F));
     OutString[2] = (char) (0x40 + ((SwappedId >> 16) & 0x1F));
     OutString[3] = AcpiUtHexToAsciiChar ((ACPI_INTEGER) SwappedId, 12);
     OutString[4] = AcpiUtHexToAsciiChar ((ACPI_INTEGER) SwappedId, 8);
     OutString[5] = AcpiUtHexToAsciiChar ((ACPI_INTEGER) SwappedId, 4);
     OutString[6] = AcpiUtHexToAsciiChar ((ACPI_INTEGER) SwappedId, 0);
     OutString[7] = 0;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExIntegerToString
  *
  * PARAMETERS:  OutString       - Where to put the converted string. At least
  *                                21 bytes are needed to hold the largest
  *                                possible 64-bit integer.
  *              Value           - Value to be converted
  *
  * RETURN:      None, string
  *
  * DESCRIPTION: Convert a 64-bit integer to decimal string representation.
  *              Assumes string buffer is large enough to hold the string. The
  *              largest string is (ACPI_MAX64_DECIMAL_DIGITS + 1).
  *
  ******************************************************************************/
 
 void
 AcpiExIntegerToString (
     char                    *OutString,
     ACPI_INTEGER            Value)
 {
     UINT32                  Count;
     UINT32                  DigitsNeeded;
     UINT32                  Remainder;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     DigitsNeeded = AcpiExDigitsNeeded (Value, 10);
     OutString[DigitsNeeded] = 0;
 
     for (Count = DigitsNeeded; Count > 0; Count--)
     {
         (void) AcpiUtShortDivide (Value, 10, &Value, &Remainder);
         OutString[Count-1] = (char) ('0' + Remainder);\
     }
 }
 
 #endif