path: root/drivers/acpi/resources/rsaddr.c

/*******************************************************************************
 *
 * Module Name: rsaddr - Address resource descriptors (16/32/64)
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2005, 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/acresrc.h>

#define _COMPONENT          ACPI_RESOURCES
ACPI_MODULE_NAME("rsaddr")

/* Local prototypes */
static void
acpi_rs_decode_general_flags(union acpi_resource_data *resource, u8 flags);

static u8 acpi_rs_encode_general_flags(union acpi_resource_data *resource);

static void
acpi_rs_decode_specific_flags(union acpi_resource_data *resource, u8 flags);

static u8 acpi_rs_encode_specific_flags(union acpi_resource_data *resource);

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_decode_general_flags
 *
 * PARAMETERS:  Resource            - Address resource data struct
 *              Flags               - Actual flag byte
 *
 * RETURN:      Decoded flag bits in resource struct
 *
 * DESCRIPTION: Decode a general flag byte to an address resource struct
 *
 ******************************************************************************/

static void
acpi_rs_decode_general_flags(union acpi_resource_data *resource, u8 flags)
{
	ACPI_FUNCTION_ENTRY();

	/* Producer / Consumer - flag bit[0] */

	resource->address.producer_consumer = (u32) (flags & 0x01);

	/* Decode (_DEC) - flag bit[1] */

	resource->address.decode = (u32) ((flags >> 1) & 0x01);

	/* Min Address Fixed (_MIF) - flag bit[2] */

	resource->address.min_address_fixed = (u32) ((flags >> 2) & 0x01);

	/* Max Address Fixed (_MAF) - flag bit[3] */

	resource->address.max_address_fixed = (u32) ((flags >> 3) & 0x01);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_encode_general_flags
 *
 * PARAMETERS:  Resource            - Address resource data struct
 *
 * RETURN:      Encoded general flag byte
 *
 * DESCRIPTION: Construct a general flag byte from an address resource struct
 *
 ******************************************************************************/

static u8 acpi_rs_encode_general_flags(union acpi_resource_data *resource)
{
	u8 flags;

	ACPI_FUNCTION_ENTRY();

	/* Producer / Consumer - flag bit[0] */

	flags = (u8) (resource->address.producer_consumer & 0x01);

	/* Decode (_DEC) - flag bit[1] */

	flags |= (u8) ((resource->address.decode & 0x01) << 1);

	/* Min Address Fixed (_MIF) - flag bit[2] */

	flags |= (u8) ((resource->address.min_address_fixed & 0x01) << 2);

	/* Max Address Fixed (_MAF) - flag bit[3] */

	flags |= (u8) ((resource->address.max_address_fixed & 0x01) << 3);

	return (flags);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_decode_specific_flags
 *
 * PARAMETERS:  Resource            - Address resource data struct
 *              Flags               - Actual flag byte
 *
 * RETURN:      Decoded flag bits in attribute struct
 *
 * DESCRIPTION: Decode a type-specific flag byte to an attribute struct.
 *              Type-specific flags are only defined for the Memory and IO
 *              resource types.
 *
 ******************************************************************************/

static void
acpi_rs_decode_specific_flags(union acpi_resource_data *resource, u8 flags)
{
	ACPI_FUNCTION_ENTRY();

	if (resource->address.resource_type == ACPI_MEMORY_RANGE) {
		/* Write Status (_RW) - flag bit[0] */

		resource->address.attribute.memory.read_write_attribute =
		    (u16) (flags & 0x01);

		/* Memory Attributes (_MEM) - flag bits[2:1] */

		resource->address.attribute.memory.cache_attribute =
		    (u16) ((flags >> 1) & 0x03);
	} else if (resource->address.resource_type == ACPI_IO_RANGE) {
		/* Ranges (_RNG) - flag bits[1:0] */

		resource->address.attribute.io.range_attribute =
		    (u16) (flags & <