linux/drivers/acpi/acpica/rscalc.c

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
 *
 * Module Name: rscalc - Calculate stream and list lengths
 *
 ******************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acresrc.h"
#include "acnamesp.h"

#define _COMPONENT …
ACPI_MODULE_NAME("rscalc")

/* Local prototypes */
static u8 acpi_rs_count_set_bits(u16 bit_field);

static acpi_rs_length
acpi_rs_struct_option_length(struct acpi_resource_source *resource_source);

static u32
acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length);

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_count_set_bits
 *
 * PARAMETERS:  bit_field       - Field in which to count bits
 *
 * RETURN:      Number of bits set within the field
 *
 * DESCRIPTION: Count the number of bits set in a resource field. Used for
 *              (Short descriptor) interrupt and DMA lists.
 *
 ******************************************************************************/

static u8 acpi_rs_count_set_bits(u16 bit_field)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_struct_option_length
 *
 * PARAMETERS:  resource_source     - Pointer to optional descriptor field
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Common code to handle optional resource_source_index and
 *              resource_source fields in some Large descriptors. Used during
 *              list-to-stream conversion
 *
 ******************************************************************************/

static acpi_rs_length
acpi_rs_struct_option_length(struct acpi_resource_source *resource_source)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_stream_option_length
 *
 * PARAMETERS:  resource_length     - Length from the resource header
 *              minimum_total_length - Minimum length of this resource, before
 *                                    any optional fields. Includes header size
 *
 * RETURN:      Length of optional string (0 if no string present)
 *
 * DESCRIPTION: Common code to handle optional resource_source_index and
 *              resource_source fields in some Large descriptors. Used during
 *              stream-to-list conversion
 *
 ******************************************************************************/

static u32
acpi_rs_stream_option_length(u32 resource_length,
			     u32 minimum_aml_resource_length)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_aml_length
 *
 * PARAMETERS:  resource            - Pointer to the resource linked list
 *              resource_list_size  - Size of the resource linked list
 *              size_needed         - Where the required size is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Takes a linked list of internal resource descriptors and
 *              calculates the size buffer needed to hold the corresponding
 *              external resource byte stream.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_aml_length(struct acpi_resource *resource,
		       acpi_size resource_list_size, acpi_size *size_needed)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_list_length
 *
 * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
 *              aml_buffer_length   - Size of aml_buffer
 *              size_needed         - Where the size needed is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Takes an external resource byte stream and calculates the size
 *              buffer needed to hold the corresponding internal resource
 *              descriptor linked list.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_list_length(u8 *aml_buffer,
			u32 aml_buffer_length, acpi_size *size_needed)
{ … }

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_pci_routing_table_length
 *
 * PARAMETERS:  package_object          - Pointer to the package object
 *              buffer_size_needed      - u32 pointer of the size buffer
 *                                        needed to properly return the
 *                                        parsed data
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Given a package representing a PCI routing table, this
 *              calculates the size of the corresponding linked list of
 *              descriptions.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
				     acpi_size *buffer_size_needed)
{ … }