linux-imx

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0

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

 *

 * Module Name: psparse - Parser top level AML parse routines

 *

 * Copyright (C) 2000 - 2019, Intel Corp.

 *

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

​

/*

 * Parse the AML and build an operation tree as most interpreters,

 * like Perl, do. Parsing is done by hand rather than with a YACC

 * generated parser to tightly constrain stack and dynamic memory

 * usage. At the same time, parsing is kept flexible and the code

 * fairly compact by parsing based on a list of AML opcode

 * templates in aml_op_info[]

 */

​

#include <acpi/acpi.h>

#include "accommon.h"

#include "acparser.h"

#include "acdispat.h"

#include "amlcode.h"

#include "acinterp.h"

#include "acnamesp.h"

​

#define _COMPONENT          ACPI_PARSER

ACPI_MODULE_NAME("psparse")

​

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

 *

 * FUNCTION:    acpi_ps_get_opcode_size

 *

 * PARAMETERS:  opcode          - An AML opcode

 *

 * RETURN:      Size of the opcode, in bytes (1 or 2)

 *

 * DESCRIPTION: Get the size of the current opcode.

 *

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

u32 acpi_ps_get_opcode_size(u32 opcode)

{

​

    /* Extended (2-byte) opcode if > 255 */

​

    if (opcode > 0x00FF) {

        return (2);

    }

​

    /* Otherwise, just a single byte opcode */

​

    return (1);

}

​

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

 *

 * FUNCTION:    acpi_ps_peek_opcode

 *

 * PARAMETERS:  parser_state        - A parser state object

 *

 * RETURN:      Next AML opcode

 *

 * DESCRIPTION: Get next AML opcode (without incrementing AML pointer)