xref: /src/sys/external/bsd/acpica/dist/compiler/dtutils.c

/******************************************************************************
 *
 * Module Name: dtutils.c - Utility routines for the data table compiler
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2015, Intel Corp.
 * 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 "aslcompiler.h"
#include "dtcompiler.h"
#include "actables.h"

#define _COMPONENT          DT_COMPILER
        ACPI_MODULE_NAME    ("dtutils")

/* Local prototypes */

static void
DtSum (
    DT_SUBTABLE             *Subtable,
    void                    *Context,
    void                    *ReturnValue);


/******************************************************************************
 *
 * FUNCTION:    DtError
 *
 * PARAMETERS:  Level               - Seriousness (Warning/error, etc.)
 *              MessageId           - Index into global message buffer
 *              Op                  - Parse node where error happened
 *              ExtraMessage        - additional error message
 *
 * RETURN:      None
 *
 * DESCRIPTION: Common error interface for data table compiler
 *
 *****************************************************************************/

void
DtError (
    UINT8                   Level,
    UINT16                  MessageId,
    DT_FIELD                *FieldObject,
    char                    *ExtraMessage)
{

    /* Check if user wants to ignore this exception */

    if (AslIsExceptionDisabled (Level, MessageId))
    {
        return;
    }

    if (FieldObject)
    {
        AslCommonError (Level, MessageId,
            FieldObject->Line,
            FieldObject->Line,
            FieldObject->ByteOffset,
            FieldObject->Column,
            Gbl_Files[ASL_FILE_INPUT].Filename, ExtraMessage);
    }
    else
    {
        AslCommonError (Level, MessageId, 0,
            0, 0, 0, 0, ExtraMessage);
    }
}


/******************************************************************************
 *
 * FUNCTION:    DtNameError
 *
 * PARAMETERS:  Level               - Seriousness (Warning/error, etc.)
 *              MessageId           - Index into global message buffer
 *              Op                  - Parse node where error happened
 *              ExtraMessage        - additional error message
 *
 * RETURN:      None
 *
 * DESCRIPTION: Error interface for named objects
 *
 *****************************************************************************/

void
DtNameError (
    UINT8                   Level,
    UINT16                  MessageId,
    DT_FIELD                *FieldObject,
    char                    *ExtraMessage)
{

    switch (Level)
    {
    case ASL_WARNING2:
    case ASL_WARNING3:

        if (Gbl_WarningLevel < Level)
        {
            return;
        }
        break;

    default:

        break;
    }

    if (FieldObject)
    {
        AslCommonError (Level, MessageId,
            FieldObject->Line,
            FieldObject->Line,
            FieldObject->ByteOffset,
            FieldObject->NameColumn,
            Gbl_Files[ASL_FILE_INPUT].Filename, ExtraMessage);
    }
    else
    {
        AslCommonError (Level, MessageId, 0,
            0, 0, 0, 0, ExtraMessage);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    DtFatal
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Dump the error log and abort the compiler. Used for serious
 *              compile or I/O errors
 *
 ******************************************************************************/

void
DtFatal (
    UINT16                  MessageId,
    DT_FIELD                *FieldObject,
    char                    *ExtraMessage)
{

    DtError (ASL_ERROR, MessageId, FieldObject, ExtraMessage);

/*
 * TBD: remove this entire function, DtFatal
 *
 * We cannot abort the compiler on error, because we may be compiling a
 * list of files. We must move on to the next file.
 */
#ifdef __OBSOLETE
    CmCleanupAndExit ();
    exit (1);
#endif
}


/******************************************************************************
 *
 * FUNCTION:    DtStrtoul64
 *
 * PARAMETERS:  String              - Null terminated string
 *              ReturnInteger       - Where the converted integer is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Simple conversion of a string hex integer constant to unsigned
 *              value. Assumes no leading "0x" for the constant.
 *
 * Portability note: The reason this function exists is because a 64-bit
 * sscanf is not available in all environments.
 *
 *****************************************************************************/

ACPI_STATUS
DtStrtoul64 (
    char                    *String,
    UINT64                  *ReturnInteger)
{
    char                    *ThisChar = String;
    UINT32                  ThisDigit;
    UINT64                  ReturnValue = 0;
    int                     DigitCount = 0;


    /* Skip over any white space in the buffer */

    while ((*ThisChar == ' ') || (*ThisChar == '\t'))
    {
        ThisChar++;
    }

    /* Skip leading zeros */

    while ((*ThisChar) == '0')
    {
        ThisChar++;
    }

    /* Convert character-by-character */

    while (*ThisChar)
    {
        if (ACPI_IS_DIGIT (*ThisChar))
        {
            /* Convert ASCII 0-9 to Decimal value */

            ThisDigit = ((UINT8) *ThisChar) - '0';
        }
        else /* Letter */
        {
            ThisDigit = (UINT32) ACPI_TOUPPER (*ThisChar);
            if (!ACPI_IS_XDIGIT ((char) ThisDigit))
            {
                /* Not A-F */

                return (AE_BAD_CHARACTER);
            }

            /* Convert ASCII Hex char (A-F) to value */

            ThisDigit = (ThisDigit - 'A') + 10;
        }

        /* Insert the 4-bit hex digit */

        ReturnValue <<= 4;
        ReturnValue += ThisDigit;

        ThisChar++;
        DigitCount++;
        if (DigitCount > 16)
        {
            /* Value is too large (> 64 bits/8 bytes/16 hex digits) */

            return (AE_LIMIT);
        }
    }

    *ReturnInteger = ReturnValue;
    return (AE_OK);
}


/******************************************************************************
 *
 * FUNCTION:    DtGetFieldValue
 *
 * PARAMETERS:  Field               - Current field list pointer
 *
 * RETURN:      Field value
 *
 * DESCRIPTION: Get field value
 *
 *****************************************************************************/

char *
DtGetFieldValue (
    DT_FIELD                *Field)
{
    if (!Field)
    {
        return (NULL);
    }

    return (Field->Value);
}


/******************************************************************************
 *
 * FUNCTION:    DtGetFieldType
 *
 * PARAMETERS:  Info                - Data table info
 *
 * RETURN:      Field type
 *
 * DESCRIPTION: Get field type
 *
 *****************************************************************************/

UINT8
DtGetFieldType (
    ACPI_DMTABLE_INFO       *Info)
{
    UINT8                   Type;


    /* DT_FLAG means that this is the start of a block of flag bits */
    /* TBD - we can make these a separate opcode later */

    if (Info->Flags & DT_FLAG)
    {
        return (DT_FIELD_TYPE_FLAGS_INTEGER);
    }

    /* Type is based upon the opcode for this field in the info table */

    switch (Info->Opcode)
    {
    case ACPI_DMT_FLAG0:
    case ACPI_DMT_FLAG1:
    case ACPI_DMT_FLAG2:
    case ACPI_DMT_FLAG3:
    case ACPI_DMT_FLAG4:
    case ACPI_DMT_FLAG5:
    case ACPI_DMT_FLAG6:
    case ACPI_DMT_FLAG7:
    case ACPI_DMT_FLAGS0:
    case ACPI_DMT_FLAGS1:
    case ACPI_DMT_FLAGS2:
    case ACPI_DMT_FLAGS4:

        Type = DT_FIELD_TYPE_FLAG;
        break;

    case ACPI_DMT_NAME4:
    case ACPI_DMT_SIG:
    case ACPI_DMT_NAME6:
    case ACPI_DMT_NAME8:
    case ACPI_DMT_STRING:

        Type = DT_FIELD_TYPE_STRING;
        break;

    case ACPI_DMT_BUFFER:
    case ACPI_DMT_RAW_BUFFER:
    case ACPI_DMT_BUF7:
    case ACPI_DMT_BUF10:
    case ACPI_DMT_BUF16:
    case ACPI_DMT_BUF128:
    case ACPI_DMT_PCI_PATH:

        Type = DT_FIELD_TYPE_BUFFER;
        break;

    case ACPI_DMT_GAS:
    case ACPI_DMT_HESTNTFY:

        Type = DT_FIELD_TYPE_INLINE_SUBTABLE;
        break;

    case ACPI_DMT_UNICODE:

        Type = DT_FIELD_TYPE_UNICODE;
        break;

    case ACPI_DMT_UUID:

        Type = DT_FIELD_TYPE_UUID;
        break;

    case ACPI_DMT_DEVICE_PATH:

        Type = DT_FIELD_TYPE_DEVICE_PATH;
        break;

    case ACPI_DMT_LABEL:

        Type = DT_FIELD_TYPE_LABEL;
        break;

    default:

        Type = DT_FIELD_TYPE_INTEGER;
        break;
    }

    return (Type);
}


/******************************************************************************
 *
 * FUNCTION:    DtGetBufferLength
 *
 * PARAMETERS:  Buffer              - List of integers,
 *                                    for example "10 3A 4F 2E"
 *
 * RETURN:      Count of integer
 *
 * DESCRIPTION: Get length of bytes needed to store the integers
 *
 *****************************************************************************/

UINT32
DtGetBufferLength (
    char                    *Buffer)
{
    UINT32                  ByteLength = 0;


    while (*Buffer)
    {
        if (*Buffer == ' ')
        {
            ByteLength++;

            while (*Buffer == ' ')
            {
                Buffer++;
            }
        }

        Buffer++;
    }

    return (++ByteLength);
}


/******************************************************************************
 *
 * FUNCTION:    DtGetFieldLength
 *
 * PARAMETERS:  Field               - Current field
 *              Info                - Data table info
 *
 * RETURN:      Field length
 *
 * DESCRIPTION: Get length of bytes needed to compile the field
 *
 * Note: This function must remain in sync with AcpiDmDumpTable.
 *
 *****************************************************************************/

UINT32
DtGetFieldLength (
    DT_FIELD                *Field,
    ACPI_DMTABLE_INFO       *Info)
{
    UINT32                  ByteLength = 0;
    char                    *Value;


    /* Length is based upon the opcode for this field in the info table */

    switch (Info->Opcode)
    {
    case ACPI_DMT_FLAG0:
    case ACPI_DMT_FLAG1:
    case ACPI_DMT_FLAG2:
    case ACPI_DMT_FLAG3:
    case ACPI_DMT_FLAG4:
    case ACPI_DMT_FLAG5:
    case ACPI_DMT_FLAG6:
    case ACPI_DMT_FLAG7:
    case ACPI_DMT_FLAGS0:
    case ACPI_DMT_FLAGS1:
    case ACPI_DMT_FLAGS2:
    case ACPI_DMT_FLAGS4:
    case ACPI_DMT_LABEL:
    case ACPI_DMT_EXTRA_TEXT:

        ByteLength = 0;
        break;

    case ACPI_DMT_UINT8:
    case ACPI_DMT_CHKSUM:
    case ACPI_DMT_SPACEID:
    case ACPI_DMT_ACCWIDTH:
    case ACPI_DMT_IVRS:
    case ACPI_DMT_GTDT:
    case ACPI_DMT_MADT:
    case ACPI_DMT_PCCT:
    case ACPI_DMT_PMTT:
    case ACPI_DMT_SRAT:
    case ACPI_DMT_ASF:
    case ACPI_DMT_HESTNTYP:
    case ACPI_DMT_FADTPM:
    case ACPI_DMT_EINJACT:
    case ACPI_DMT_EINJINST:
    case ACPI_DMT_ERSTACT:
    case ACPI_DMT_ERSTINST:
    case ACPI_DMT_DMAR_SCOPE:

        ByteLength = 1;
        break;

    case ACPI_DMT_UINT16:
    case ACPI_DMT_DMAR:
    case ACPI_DMT_HEST:
    case ACPI_DMT_PCI_PATH:

        ByteLength = 2;
        break;

    case ACPI_DMT_UINT24:

        ByteLength = 3;
        break;

    case ACPI_DMT_UINT32:
    case ACPI_DMT_NAME4:
    case ACPI_DMT_SIG:
    case ACPI_DMT_LPIT:

        ByteLength = 4;
        break;

    case ACPI_DMT_UINT40:

        ByteLength = 5;
        break;

    case ACPI_DMT_UINT48:
    case ACPI_DMT_NAME6:

        ByteLength = 6;
        break;

    case ACPI_DMT_UINT56:
    case ACPI_DMT_BUF7:

        ByteLength = 7;
        break;

    case ACPI_DMT_UINT64:
    case ACPI_DMT_NAME8:

        ByteLength = 8;
        break;

    case ACPI_DMT_STRING:

        Value = DtGetFieldValue (Field);
        if (Value)
        {
            ByteLength = ACPI_STRLEN (Value) + 1;
        }
        else
        {   /* At this point, this is a fatal error */

            snprintf (MsgBuffer, sizeof(MsgBuffer), "Expected \"%s\"", Info->Name);
            DtFatal (ASL_MSG_COMPILER_INTERNAL, NULL, MsgBuffer);
            return (0);
        }
        break;

    case ACPI_DMT_GAS:

        ByteLength = sizeof (ACPI_GENERIC_ADDRESS);
        break;

    case ACPI_DMT_HESTNTFY:

        ByteLength = sizeof (ACPI_HEST_NOTIFY);
        break;

    case ACPI_DMT_BUFFER:
    case ACPI_DMT_RAW_BUFFER:

        Value = DtGetFieldValue (Field);
        if (Value)
        {
            ByteLength = DtGetBufferLength (Value);
        }
        else
        {   /* At this point, this is a fatal error */

            snprintf (MsgBuffer, sizeof(MsgBuffer), "Expected \"%s\"", Info->Name);
            DtFatal (ASL_MSG_COMPILER_INTERNAL, NULL, MsgBuffer);
            return (0);
        }
        break;

    case ACPI_DMT_BUF10:

        ByteLength = 10;
        break;

    case ACPI_DMT_BUF16:
    case ACPI_DMT_UUID:

        ByteLength = 16;
        break;

    case ACPI_DMT_BUF128:

        ByteLength = 128;
        break;

    case ACPI_DMT_UNICODE:

        Value = DtGetFieldValue (Field);

        /* TBD: error if Value is NULL? (as below?) */

        ByteLength = (ACPI_STRLEN (Value) + 1) * sizeof(UINT16);
        break;

    default:

        DtFatal (ASL_MSG_COMPILER_INTERNAL, Field, "Invalid table opcode");
        return (0);
    }

    return (ByteLength);
}


/******************************************************************************
 *
 * FUNCTION:    DtSum
 *
 * PARAMETERS:  DT_WALK_CALLBACK:
 *              Subtable            - Subtable
 *              Context             - Unused
 *              ReturnValue         - Store the checksum of subtable
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the checksum of subtable
 *
 *****************************************************************************/

static void
DtSum (
    DT_SUBTABLE             *Subtable,
    void                    *Context,
    void                    *ReturnValue)
{
    UINT8                   Checksum;
    UINT8                   *Sum = ReturnValue;


    Checksum = AcpiTbChecksum (Subtable->Buffer, Subtable->Length);
    *Sum = (UINT8) (*Sum + Checksum);
}


/******************************************************************************
 *
 * FUNCTION:    DtSetTableChecksum
 *
 * PARAMETERS:  ChecksumPointer     - Where to return the checksum
 *
 * RETURN:      None
 *
 * DESCRIPTION: Set checksum of the whole data table into the checksum field
 *
 *****************************************************************************/

void
DtSetTableChecksum (
    UINT8                   *ChecksumPointer)
{
    UINT8                   Checksum = 0;
    UINT8                   OldSum;


    DtWalkTableTree (Gbl_RootTable, DtSum, NULL, &Checksum);

    OldSum = *ChecksumPointer;
    Checksum = (UINT8) (Checksum - OldSum);

    /* Compute the final checksum */

    Checksum = (UINT8) (0 - Checksum);
    *ChecksumPointer = Checksum;
}


/******************************************************************************
 *
 * FUNCTION:    DtSetTableLength
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Walk the subtables and set all the length fields
 *
 *****************************************************************************/

void
DtSetTableLength (
    void)
{
    DT_SUBTABLE             *ParentTable;
    DT_SUBTABLE             *ChildTable;


    ParentTable = Gbl_RootTable;
    ChildTable = NULL;

    if (!ParentTable)
    {
        return;
    }

    DtSetSubtableLength (ParentTable);

    while (1)
    {
        ChildTable = DtGetNextSubtable (ParentTable, ChildTable);
        if (ChildTable)
        {
            if (ChildTable->LengthField)
            {
                DtSetSubtableLength (ChildTable);
            }

            if (ChildTable->Child)
            {
                ParentTable = ChildTable;
                ChildTable = NULL;
            }
            else
            {
                ParentTable->TotalLength += ChildTable->TotalLength;
                if (ParentTable->LengthField)
                {
                    DtSetSubtableLength (ParentTable);
                }
            }
        }
        else
        {
            ChildTable = ParentTable;

            if (ChildTable == Gbl_RootTable)
            {
                break;
            }

            ParentTable = DtGetParentSubtable (ParentTable);

            ParentTable->TotalLength += ChildTable->TotalLength;
            if (ParentTable->LengthField)
            {
                DtSetSubtableLength (ParentTable);
            }
        }
    }
}


/******************************************************************************
 *
 * FUNCTION:    DtWalkTableTree
 *
 * PARAMETERS:  StartTable          - Subtable in the tree where walking begins
 *              UserFunction        - Called during the walk
 *              Context             - Passed to user function
 *              ReturnValue         - The return value of UserFunction
 *
 * RETURN:      None
 *
 * DESCRIPTION: Performs a depth-first walk of the subtable tree
 *
 *****************************************************************************/

void
DtWalkTableTree (
    DT_SUBTABLE             *StartTable,
    DT_WALK_CALLBACK        UserFunction,
    void                    *Context,
    void                    *ReturnValue)
{
    DT_SUBTABLE             *ParentTable;
    DT_SUBTABLE             *ChildTable;


    ParentTable = StartTable;
    ChildTable = NULL;

    if (!ParentTable)
    {
        return;
    }

    UserFunction (ParentTable, Context, ReturnValue);

    while (1)
    {
        ChildTable = DtGetNextSubtable (ParentTable, ChildTable);
        if (ChildTable)
        {
            UserFunction (ChildTable, Context, ReturnValue);

            if (ChildTable->Child)
            {
                ParentTable = ChildTable;
                ChildTable = NULL;
            }
        }
        else
        {
            ChildTable = ParentTable;
            if (ChildTable == Gbl_RootTable)
            {
                break;
            }

            ParentTable = DtGetParentSubtable (ParentTable);

            if (ChildTable->Peer == StartTable)
            {
                break;
            }
        }
    }
}


/*******************************************************************************
 *
 * FUNCTION:    UtSubtableCacheCalloc
 *
 * PARAMETERS:  None
 *
 * RETURN:      Pointer to the buffer. Aborts on allocation failure
 *
 * DESCRIPTION: Allocate a subtable object buffer. Bypass the local
 *              dynamic memory manager for performance reasons (This has a
 *              major impact on the speed of the compiler.)
 *
 ******************************************************************************/

DT_SUBTABLE *
UtSubtableCacheCalloc (
    void)
{
    ASL_CACHE_INFO          *Cache;


    if (Gbl_SubtableCacheNext >= Gbl_SubtableCacheLast)
    {
        /* Allocate a new buffer */

        Cache = UtLocalCalloc (sizeof (Cache->Next) +
            (sizeof (DT_SUBTABLE) * ASL_SUBTABLE_CACHE_SIZE));

        /* Link new cache buffer to head of list */

        Cache->Next = Gbl_SubtableCacheList;
        Gbl_SubtableCacheList = Cache;

        /* Setup cache management pointers */

        Gbl_SubtableCacheNext = ACPI_CAST_PTR (DT_SUBTABLE, Cache->Buffer);
        Gbl_SubtableCacheLast = Gbl_SubtableCacheNext + ASL_SUBTABLE_CACHE_SIZE;
    }

    Gbl_SubtableCount++;
    return (Gbl_SubtableCacheNext++);
}


/*******************************************************************************
 *
 * FUNCTION:    UtFieldCacheCalloc
 *
 * PARAMETERS:  None
 *
 * RETURN:      Pointer to the buffer. Aborts on allocation failure
 *
 * DESCRIPTION: Allocate a field object buffer. Bypass the local
 *              dynamic memory manager for performance reasons (This has a
 *              major impact on the speed of the compiler.)
 *
 ******************************************************************************/

DT_FIELD *
UtFieldCacheCalloc (
    void)
{
    ASL_CACHE_INFO          *Cache;


    if (Gbl_FieldCacheNext >= Gbl_FieldCacheLast)
    {
        /* Allocate a new buffer */

        Cache = UtLocalCalloc (sizeof (Cache->Next) +
            (sizeof (DT_FIELD) * ASL_FIELD_CACHE_SIZE));

        /* Link new cache buffer to head of list */

        Cache->Next = Gbl_FieldCacheList;
        Gbl_FieldCacheList = Cache;

        /* Setup cache management pointers */

        Gbl_FieldCacheNext = ACPI_CAST_PTR (DT_FIELD, Cache->Buffer);
        Gbl_FieldCacheLast = Gbl_FieldCacheNext + ASL_FIELD_CACHE_SIZE;
    }

    Gbl_FieldCount++;
    return (Gbl_FieldCacheNext++);
}


/*******************************************************************************
 *
 * FUNCTION:    DtDeleteCaches
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Delete all local cache buffer blocks
 *
 ******************************************************************************/

void
DtDeleteCaches (
    void)
{
    UINT32                  BufferCount;
    ASL_CACHE_INFO          *Next;


    /* Field cache */

    BufferCount = 0;
    while (Gbl_FieldCacheList)
    {
        Next = Gbl_FieldCacheList->Next;
        ACPI_FREE (Gbl_FieldCacheList);
        Gbl_FieldCacheList = Next;
        BufferCount++;
    }

    DbgPrint (ASL_DEBUG_OUTPUT,
        "%u Fields, Buffer size: %u fields (%u bytes), %u Buffers\n",
        Gbl_FieldCount, ASL_FIELD_CACHE_SIZE,
        (sizeof (DT_FIELD) * ASL_FIELD_CACHE_SIZE), BufferCount);

    Gbl_FieldCount = 0;
    Gbl_FieldCacheNext = NULL;
    Gbl_FieldCacheLast = NULL;

    /* Subtable cache */

    BufferCount = 0;
    while (Gbl_SubtableCacheList)
    {
        Next = Gbl_SubtableCacheList->Next;
        ACPI_FREE (Gbl_SubtableCacheList);
        Gbl_SubtableCacheList = Next;
        BufferCount++;
    }

    DbgPrint (ASL_DEBUG_OUTPUT,
        "%u Subtables, Buffer size: %u subtables (%u bytes), %u Buffers\n",
        Gbl_SubtableCount, ASL_SUBTABLE_CACHE_SIZE,
        (sizeof (DT_SUBTABLE) * ASL_SUBTABLE_CACHE_SIZE), BufferCount);

    Gbl_SubtableCount = 0;
    Gbl_SubtableCacheNext = NULL;
    Gbl_SubtableCacheLast = NULL;
}