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/******************************************************************************

 *

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

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2007, R. Byron Moore

 * 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 <acpi/acpi.h>

#include <acpi/acparser.h>

#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_PARSER

ACPI_MODULE_NAME("psutils")

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_create_scope_op

 *

 * PARAMETERS:  None

 *

 * RETURN:      A new Scope object, null on failure

 *

 * DESCRIPTION: Create a Scope and associated namepath op with the root name

 *

 ******************************************************************************/

union acpi_parse_object *acpi_ps_create_scope_op(void)

{

        union acpi_parse_object *scope_op;

        scope_op = acpi_ps_alloc_op(AML_SCOPE_OP);

        if (!scope_op) {

                return (NULL);

        }

        scope_op->named.name = ACPI_ROOT_NAME;

        return (scope_op);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_init_op

 *

 * PARAMETERS:  Op              - A newly allocated Op object

 *              Opcode          - Opcode to store in the Op

 *

 * RETURN:      None

 *

 * DESCRIPTION: Initialize a parse (Op) object

 *

 ******************************************************************************/

void acpi_ps_init_op(union acpi_parse_object *op, u16 opcode)

{

        ACPI_FUNCTION_ENTRY();

        op->common.descriptor_type = ACPI_DESC_TYPE_PARSER;

        op->common.aml_opcode = opcode;

        ACPI_DISASM_ONLY_MEMBERS(ACPI_STRNCPY(op->common.aml_op_name,

                                              (acpi_ps_get_opcode_info

                                               (opcode))->name,

                                              sizeof(op->common.aml_op_name)));

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_alloc_op

 *

 * 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.

 *

 ******************************************************************************/

union acpi_parse_object *acpi_ps_alloc_op(u16 opcode)

{

        union acpi_parse_object *op;

        const struct acpi_opcode_info *op_info;

        u8 flags = ACPI_PARSEOP_GENERIC;

        ACPI_FUNCTION_ENTRY();

        op_info = acpi_ps_get_opcode_info(opcode);

        /* Determine type of parse_op required */

        if (op_info->flags & AML_DEFER) {

                flags = ACPI_PARSEOP_DEFERRED;

        } else if (op_info->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 = acpi_os_acquire_object(acpi_gbl_ps_node_cache);

        } else {

                /* Extended parseop */

                op = acpi_os_acquire_object(acpi_gbl_ps_node_ext_cache);

        }

        /* Initialize the Op */

        if (op) {

                acpi_ps_init_op(op, opcode);

                op->common.flags = flags;

        }

        return (op);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ps_free_op

 *

 * 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 acpi_ps_free_op(union acpi_parse_object *op)

{

        ACPI_FUNCTION_NAME(ps_free_op);

        if (op->common.aml_opcode == 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)acpi_os_release_object(acpi_gbl_ps_node_cache, op);

        } else {

                (void)acpi_os_release_object(acpi_gbl_ps_node_ext_cache, op);

        }

}

/*******************************************************************************

 *

 * FUNCTION:    Utility functions

 *

 * DESCRIPTION: Low level character and object functions

 *

 ******************************************************************************/

/*

 * Is "c" a namestring lead character?

 */

u8 acpi_ps_is_leading_char(u32 c)

{

        return ((u8) (c == '_' || (c >= 'A' && c <= 'Z')));

}

/*

 * Is "c" a namestring prefix character?

 */

u8 acpi_ps_is_prefix_char(u32 c)

{

        return ((u8) (c == '\\' || c == '^'));

}

/*

 * Get op's name (4-byte name segment) or 0 if unnamed

 */

#ifdef ACPI_FUTURE_USAGE

u32 acpi_ps_get_name(union 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);

}

#endif                          /*  ACPI_FUTURE_USAGE  */

/*

 * Set op's name

 */

void acpi_ps_set_name(union acpi_parse_object *op, u32 name)

{

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

        if (op->common.flags & ACPI_PARSEOP_GENERIC) {

                return;

        }

        op->named.name = name;

}