rsmemory.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/*******************************************************************************
 *
 * Module Name: rsmem24 - Memory resource descriptors
 *              $Revision: 14 $
 *
 ******************************************************************************/

/*
 *  Copyright (C) 2000, 2001 R. Byron Moore
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include "acpi.h"
#include "acresrc.h"

#define _COMPONENT          ACPI_RESOURCES
	 MODULE_NAME         ("rsmemory")


/*******************************************************************************
 *
 * FUNCTION:    Acpi_rs_memory24_resource
 *
 * PARAMETERS:  Byte_stream_buffer      - Pointer to the resource input byte
 *                                        stream
 *              Bytes_consumed          - u32 pointer that is filled with
 *                                        the number of bytes consumed from
 *                                        the Byte_stream_buffer
 *              Output_buffer           - Pointer to the user's return buffer
 *              Structure_size          - u32 pointer that is filled with
 *                                        the number of bytes in the filled
 *                                        in structure
 *
 * 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_memory24_resource (
	u8                      *byte_stream_buffer,
	u32                     *bytes_consumed,
	u8                      **output_buffer,
	u32                     *structure_size)
{
	u8                      *buffer = byte_stream_buffer;
	acpi_resource           *output_struct = (acpi_resource *) *output_buffer;
	u16                     temp16 = 0;
	u8                      temp8 = 0;
	u32                     struct_size = SIZEOF_RESOURCE (acpi_resource_mem24);


	FUNCTION_TRACE ("Rs_memory24_resource");


	/*
	 * Point past the Descriptor to get the number of bytes consumed
	 */
	buffer += 1;

	MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
	buffer += 2;
	*bytes_consumed = temp16 + 3;
	output_struct->id = ACPI_RSTYPE_MEM24;

	/*
	 * Check Byte 3 the Read/Write bit
	 */
	temp8 = *buffer;
	buffer += 1;
	output_struct->data.memory24.read_write_attribute = temp8 & 0x01;

	/*
	 * Get Min_base_address (Bytes 4-5)
	 */
	MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
	buffer += 2;
	output_struct->data.memory24.min_base_address = temp16;

	/*
	 * Get Max_base_address (Bytes 6-7)
	 */
	MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
	buffer += 2;
	output_struct->data.memory24.max_base_address = temp16;

	/*
	 * Get Alignment (Bytes 8-9)
	 */
	MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
	buffer += 2;
	output_struct->data.memory24.alignment = temp16;

	/*
	 * Get Range_length (Bytes 10-11)
	 */
	MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
	output_struct->data.memory24.range_length = temp16;

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

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


/*******************************************************************************
 *
 * FUNCTION:    Acpi_rs_memory24_stream
 *
 * PARAMETERS:  Linked_list             - Pointer to the resource linked list
 *              Output_buffer           - Pointer to the user's return buffer
 *              Bytes_consumed          - u32 pointer that is filled with
 *                                        the number of bytes of the
 *                                        Output_buffer used
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Take the linked list resource structure and fills in the
 *              the appropriate bytes in a byte stream
 *
 ******************************************************************************/

acpi_status
acpi_rs_memory24_stream (
	acpi_resource           *linked_list,
	u8                      **output_buffer,
	u32                     *bytes_consumed)
{
	u8                      *buffer = *output_buffer;
	u16                     temp16 = 0;
	u8                      temp8 = 0;


	FUNCTION_TRACE ("Rs_memory24_stream");


	/*
	 * The descriptor field is static
	 */
	*buffer = 0x81;
	buffer += 1;

	/*
	 * The length field is static
	 */
	temp16 = 0x09;
	MOVE_UNALIGNED16_TO_16 (buffer, &temp16);
	buffer += 2;

	/*
	 * Set the Information Byte
	 */
	temp8 = (u8) (linked_list->data.memory24.read_write_attribute & 0x01);
	*buffer = temp8;
	buffer += 1;

	/*
	 * Set the Range minimum base address
	 */
	MOVE_UNALIGNED16_TO_16 (buffer, &linked_list->data.memory24.min_base_address);
	buffer += 2;

	/*
	 * Set the Range maximum base address
	 */
	MOVE_UNALIGNED16_TO_16 (buffer, &linked_list->data.memory24.max_base_address);
	buffer += 2;

	/*
	 * Set the base alignment
	 */
	MOVE_UNALIGNED16_TO_16 (buffer, &linked_list->data.memory24.alignment);
	buffer += 2;

	/*
	 * Set the range length
	 */
	MOVE_UNALIGNED16_TO_16 (buffer, &linked_list->data.memory24.range_length);
	buffer += 2;

	/*
	 * Return the number of bytes consumed in this operation
	 */
	*bytes_consumed = POINTER_DIFF (buffer, *output_buffer);
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_rs_memory32_range_resource
 *
 * PARAMETERS:  Byte_stream_buffer      - Pointer to the resource input byte
 *                                        stream
 *              Bytes_consumed          - u32 pointer that is filled with
 *                                        the number of bytes consumed from
 *                                        the Byte_stream_buffer
 *              Output_buffer           - Pointer to the user's return buffer
 *              Structure_size          - u32 pointer that is filled with
 *                                        the number of bytes in the filled
 *                                        in structure
 *
 * 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_memory32_range_resource (
	u8                      *byte_stream_buffer,
	u32                     *bytes_consumed,
	u8                      **output_buffer,
	u32                     *structure_size)
{
	u8                      *buffer = byte_stream_buffer;
	acpi_resource           *output_struct = (acpi_resource *) *output_buffer;
	u16                     temp16 = 0;
	u8                      temp8 = 0;
	u32                     struct_size = SIZEOF_RESOURCE (acpi_resource_mem32);


	FUNCTION_TRACE ("Rs_memory32_range_resource");


	/*
	 * Point past the Descriptor to get the number of bytes consumed
	 */
	buffer += 1;

	MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
	buffer += 2;
	*bytes_consumed = temp16 + 3;

	output_struct->id = ACPI_RSTYPE_MEM32;

	/*
	 *  Point to the place in the output buffer where the data portion will
	 *  begin.
	 *  1. Set the RESOURCE_DATA * Data to point to it's own address, then
	 *  2. Set the pointer to the next address.
	 *
	 *  NOTE: Output_struct->Data is cast to u8, otherwise, this addition adds
	 *  4 * sizeof(RESOURCE_DATA) instead of 4 * sizeof(u8)
	 */

	/*
	 * Check Byte 3 the Read/Write bit
	 */
	temp8 = *buffer;
	buffer += 1;

	output_struct->data.memory32.read_write_attribute = temp8 & 0x01;