linux/drivers/acpi/acpica/exnames.c

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: exnames - interpreter/scanner name load/execute
 *
 * Copyright (C) 2000 - 2023, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "amlcode.h"

#define _COMPONENT …
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)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_name_segment
 *
 * PARAMETERS:  in_aml_address  - Pointer to the name in the AML code
 *              name_string     - Where to return the name. The name is appended
 *                                to any existing string to form a namepath
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Extract an ACPI name (4 bytes) from the AML byte stream
 *
 ******************************************************************************/

static acpi_status acpi_ex_name_segment(u8 ** in_aml_address, char *name_string)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_get_name_string
 *
 * PARAMETERS:  data_type           - Object type to be associated with this
 *                                    name
 *              in_aml_address      - Pointer to the namestring in the AML code
 *              out_name_string     - Where the namestring is returned
 *              out_name_length     - Length of the returned string
 *
 * RETURN:      Status, namestring and length
 *
 * DESCRIPTION: Extract a full namepath from the AML byte stream,
 *              including any prefixes.
 *
 ******************************************************************************/

acpi_status
acpi_ex_get_name_string(acpi_object_type data_type,
			u8 * in_aml_address,
			char **out_name_string, u32 * out_name_length)
{ … }