linux-imx

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

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

 *

 * Module Name: exnames - interpreter/scanner name load/execute

 *

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

 *

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

​

#include <acpi/acpi.h>

#include "accommon.h"

#include "acinterp.h"

#include "amlcode.h"

​

#define _COMPONENT          ACPI_EXECUTER

ACPI_MODULE_NAME("exnames")

​

/* Local prototypes */

static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs);

​

static acpi_status acpi_ex_name_segment(u8 **in_aml_address, char *name_string);

​

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

 *

 * FUNCTION:    acpi_ex_allocate_name_string

 *

 * PARAMETERS:  prefix_count        - Count of parent levels. Special cases:

 *                                    (-1)==root,  0==none

 *              num_name_segs       - count of 4-character name segments

 *

 * RETURN:      A pointer to the allocated string segment. This segment must

 *              be deleted by the caller.

 *

 * DESCRIPTION: Allocate a buffer for a name string. Ensure allocated name

 *              string is long enough, and set up prefix if any.

 *

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

​

static char *acpi_ex_allocate_name_string(u32 prefix_count, u32 num_name_segs)

{

    char *temp_ptr;

    char *name_string;

    u32 size_needed;

​

    ACPI_FUNCTION_TRACE(ex_allocate_name_string);

​

    /*

     * Allow room for all \ and ^ prefixes, all segments and a multi_name_prefix.

     * Also, one byte for the null terminator.

     * This may actually be somewhat longer than needed.

     */

    if (prefix_count == ACPI_UINT32_MAX) {

​

        /* Special case for root */

​

        size_needed = 1 + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1;

    } else {

        size_needed =

            prefix_count + (ACPI_NAME_SIZE * num_name_segs) + 2 + 1;

    }

​

    /*

     * Allocate a buffer for the name.