rsio.c

h内核

/*******************************************************************************
 *
 * Module Name: rsio - IO and DMA resource descriptors
 *
 ******************************************************************************/

/*
 * 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    ("rsio")


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_io_resource
 *
 * PARAMETERS:  byte_stream_buffer      - Pointer to the resource input byte
 *                                        stream
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        consumed the byte_stream_buffer is
 *                                        returned
 *              output_buffer           - Pointer to the return data buffer
 *              structure_size          - Pointer to where the number of bytes
 *                                        in the return data struct is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the resource byte stream and fill out the appropriate
 *              structure pointed to by the output_buffer. Return the
 *              number of bytes consumed from the byte stream.
 *
 ******************************************************************************/

acpi_status
acpi_rs_io_resource (
	u8                              *byte_stream_buffer,
	acpi_size                       *bytes_consumed,
	u8                              **output_buffer,
	acpi_size                       *structure_size)
{
	u8                              *buffer = byte_stream_buffer;
	struct acpi_resource            *output_struct = (void *) *output_buffer;
	u16                             temp16 = 0;
	u8                              temp8 = 0;
	acpi_size                       struct_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_io);


	ACPI_FUNCTION_TRACE ("rs_io_resource");


	/*
	 * The number of bytes consumed are Constant
	 */
	*bytes_consumed = 8;

	output_struct->id = ACPI_RSTYPE_IO;

	/*
	 * Check Decode
	 */
	buffer += 1;
	temp8 = *buffer;

	output_struct->data.io.io_decode = temp8 & 0x01;

	/*
	 * Check min_base Address
	 */
	buffer += 1;
	ACPI_MOVE_16_TO_16 (&temp16, buffer);

	output_struct->data.io.min_base_address = temp16;

	/*
	 * Check max_base Address
	 */
	buffer += 2;
	ACPI_MOVE_16_TO_16 (&temp16, buffer);

	output_struct->data.io.max_base_address = temp16;

	/*
	 * Check Base alignment
	 */
	buffer += 2;
	temp8 = *buffer;

	output_struct->data.io.alignment = temp8;

	/*
	 * Check range_length
	 */
	buffer += 1;
	temp8 = *buffer;

	output_struct->data.io.range_length = temp8;

	/*
	 * Set the Length parameter
	 */
	output_struct->length = (u32) struct_size;

	/*
	 * Return the final size of the structure
	 */
	*structure_size = struct_size;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_fixed_io_resource
 *
 * PARAMETERS:  byte_stream_buffer      - Pointer to the resource input byte
 *                                        stream
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        consumed the byte_stream_buffer is
 *                                        returned
 *              output_buffer           - Pointer to the return data buffer
 *              structure_size          - Pointer to where the number of bytes
 *                                        in the return data struct is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the resource byte stream and fill out the appropriate
 *              structure pointed to by the output_buffer. Return the
 *              number of bytes consumed from the byte stream.
 *
 ******************************************************************************/

acpi_status
acpi_rs_fixed_io_resource (
	u8                              *byte_stream_buffer,
	acpi_size                       *bytes_consumed,
	u8                              **output_buffer,
	acpi_size                       *structure_size)
{
	u8                              *buffer = byte_stream_buffer;
	struct acpi_resource            *output_struct = (void *) *output_buffer;
	u16                             temp16 = 0;
	u8                              temp8 = 0;
	acpi_size                       struct_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_fixed_io);


	ACPI_FUNCTION_TRACE ("rs_fixed_io_resource");


	/*
	 * The number of bytes consumed are Constant
	 */
	*bytes_consumed = 4;

	output_struct->id = ACPI_RSTYPE_FIXED_IO;

	/*
	 * Check Range Base Address
	 */
	buffer += 1;
	ACPI_MOVE_16_TO_16 (&temp16, buffer);

	output_struct->data.fixed_io.base_address = temp16;

	/*
	 * Check range_length
	 */
	buffer += 2;
	temp8 = *buffer;

	output_struct->data.fixed_io.range_length = temp8;

	/*
	 * Set the Length parameter
	 */
	output_struct->length = (u32) struct_size;

	/*
	 * Return the final size of the structure
	 */
	*structure_size = struct_size;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_io_stream
 *
 * PARAMETERS:  linked_list             - Pointer to the resource linked list
 *              output_buffer           - Pointer to the user's return buffer
 *              bytes_consumed          - Pointer to where the number of bytes
 *                                        used in the output_buffer is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the linked list resource structure and fills in the
 *              the appropriate bytes in a byte stream
 *
 ******************************************************************************/

acpi_status
acpi_rs_io_stream (
	struct acpi_resource            *linked_list,
	u8                              **output_buffer,
	acpi_size                       *bytes_consumed)
{
	u8                              *buffer = *output_buffer;
	u16                             temp16 = 0;
	u8                              temp8 = 0;


	ACPI_FUNCTION_TRACE ("rs_io_stream");


	/*
	 * The descriptor field is static
	 */
	*buffer = 0x47;
	buffer += 1;

	/*
	 * Io Information Byte
	 */
	temp8 = (u8) (linked_list->data.io.io_decode & 0x01);

	*buffer = temp8;
	buffer += 1;

	/*
	 * Set the Range minimum base address
	 */
	temp16 = (u16) linked_list->data.io.min_base_address;

	ACPI_MOVE_16_TO_16 (buffer, &temp16);