acpica/parser/psutils.c

/******************************************************************************
 *
 * Module Name: psutils - Parser miscellaneous utilities (Parser only)
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 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.
 *
 *****************************************************************************/


#include "acpi.h"
#include "accommon.h"
#include "acparser.h"
#include "amlcode.h"

#define _COMPONENT          ACPI_PARSER
        ACPI_MODULE_NAME    ("psutils")


/*******************************************************************************
 *
 * FUNCTION:    AcpiPsCreateScopeOp
 *
 * PARAMETERS:  None
 *
 * RETURN:      A new Scope object, null on failure
 *
 * DESCRIPTION: Create a Scope and associated namepath op with the root name
 *
 ******************************************************************************/

ACPI_PARSE_OBJECT *
AcpiPsCreateScopeOp (
    void)
{
    ACPI_PARSE_OBJECT       *ScopeOp;


    ScopeOp = AcpiPsAllocOp (AML_SCOPE_OP);
    if (!ScopeOp)
    {
        return (NULL);
    }

    ScopeOp->Named.Name = ACPI_ROOT_NAME;
    return (ScopeOp);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiPsInitOp
 *
 * PARAMETERS:  Op              - A newly allocated Op object
 *              Opcode          - Opcode to store in the Op
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize a parse (Op) object
 *
 ******************************************************************************/

void
AcpiPsInitOp (
    ACPI_PARSE_OBJECT       *Op,
    UINT16                  Opcode)
{
    ACPI_FUNCTION_ENTRY ();


    Op->Common.DescriptorType = ACPI_DESC_TYPE_PARSER;
    Op->Common.AmlOpcode = Opcode;

    ACPI_DISASM_ONLY_MEMBERS (ACPI_STRNCPY (Op->Common.AmlOpName,
            (AcpiPsGetOpcodeInfo (Opcode))->Name,
                sizeof (Op->Common.AmlOpName)));
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiPsAllocOp
 *
 * PARAMETERS:  Opcode          - Opcode that will be stored in the new Op
 *
 * RETURN:      Pointer to the new Op, null on failure
 *
 * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on
 *              opcode.  A cache of opcodes is available for the pure
 *              GENERIC_OP, since this is by far the most commonly used.
 *
 ******************************************************************************/

ACPI_PARSE_OBJECT*
AcpiPsAllocOp (
    UINT16                  Opcode)
{
    ACPI_PARSE_OBJECT       *Op;
    const ACPI_OPCODE_INFO  *OpInfo;
    UINT8                   Flags = ACPI_PARSEOP_GENERIC;


    ACPI_FUNCTION_ENTRY ();


    OpInfo = AcpiPsGetOpcodeInfo (Opcode);

    /* Determine type of ParseOp required */

    if (OpInfo->Flags & AML_DEFER)
    {
        Flags = ACPI_PARSEOP_DEFERRED;
    }
    else if (OpInfo->Flags & AML_NAMED)
    {
        Flags = ACPI_PARSEOP_NAMED;
    }
    else if (Opcode == AML_INT_BYTELIST_OP)
    {
        Flags = ACPI_PARSEOP_BYTELIST;
    }

    /* Allocate the minimum required size object */

    if (Flags == ACPI_PARSEOP_GENERIC)
    {
        /* The generic op (default) is by far the most common (16 to 1) */

        Op = AcpiOsAcquireObject (AcpiGbl_PsNodeCache);
    }
    else
    {
        /* Extended parseop */

        Op = AcpiOsAcquireObject (AcpiGbl_PsNodeExtCache);
    }

    /* Initialize the Op */

    if (Op)
    {
        AcpiPsInitOp (Op, Opcode);
        Op->Common.Flags = Flags;
    }

    return (Op);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiPsFreeOp
 *
 * PARAMETERS:  Op              - Op to be freed
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Free an Op object.  Either put it on the GENERIC_OP cache list
 *              or actually free it.
 *
 ******************************************************************************/

void
AcpiPsFreeOp (
    ACPI_PARSE_OBJECT       *Op)
{
    ACPI_FUNCTION_NAME (PsFreeOp);


    if (Op->Common.AmlOpcode == AML_INT_RETURN_VALUE_OP)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Free retval op: %p\n", Op));
    }

    if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
    {
        (void) AcpiOsReleaseObject (AcpiGbl_PsNodeCache, Op);
    }
    else
    {
        (void) AcpiOsReleaseObject (AcpiGbl_PsNodeExtCache, Op);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    Utility functions
 *
 * DESCRIPTION: Low level character and object functions
 *
 ******************************************************************************/


/*
 * Is "c" a namestring lead character?
 */
BOOLEAN
AcpiPsIsLeadingChar (
    UINT32                  c)
{
    return ((BOOLEAN) (c == '_' || (c >= 'A' && c <= 'Z')));
}


/*
 * Is "c" a namestring prefix character?
 */
BOOLEAN
AcpiPsIsPrefixChar (
    UINT32                  c)
{
    return ((BOOLEAN) (c == '\\' || c == '^'));
}


/*
 * Get op's name (4-byte name segment) or 0 if unnamed
 */
UINT32
AcpiPsGetName (
    ACPI_PARSE_OBJECT       *Op)
{

    /* The "generic" object has no name associated with it */

    if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
    {
        return (0);
    }

    /* Only the "Extended" parse objects have a name */

    return (Op->Named.Name);
}


/*
 * Set op's name
 */
void
AcpiPsSetName (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  name)
{

    /* The "generic" object has no name associated with it */

    if (Op->Common.Flags & ACPI_PARSEOP_GENERIC)
    {
        return;
    }

    Op->Named.Name = name;
}