rsaddr.c

h内核

/*******************************************************************************
 *
 * 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")


/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_address16_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_address16_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;
	u8                              *temp_ptr;
	acpi_size                       struct_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address16);
	u32                             index;
	u16                             temp16;
	u8                              temp8;


	ACPI_FUNCTION_TRACE ("rs_address16_resource");


	/*
	 * Point past the Descriptor to get the number of bytes consumed
	 */
	buffer += 1;
	ACPI_MOVE_16_TO_16 (&temp16, buffer);

	/* Validate minimum descriptor length */

	if (temp16 < 13) {
		return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
	}

	*bytes_consumed = temp16 + 3;
	output_struct->id = ACPI_RSTYPE_ADDRESS16;

	/*
	 * Get the Resource Type (Byte3)
	 */
	buffer += 2;
	temp8 = *buffer;

	/* Values 0-2 are valid */

	if (temp8 > 2) {
		return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
	}

	output_struct->data.address16.resource_type = temp8 & 0x03;

	/*
	 * Get the General Flags (Byte4)
	 */
	buffer += 1;
	temp8 = *buffer;

	/* Producer / Consumer */

	output_struct->data.address16.producer_consumer = temp8 & 0x01;

	/* Decode */

	output_struct->data.address16.decode = (temp8 >> 1) & 0x01;

	/* Min Address Fixed */

	output_struct->data.address16.min_address_fixed = (temp8 >> 2) & 0x01;

	/* Max Address Fixed */

	output_struct->data.address16.max_address_fixed = (temp8 >> 3) & 0x01;

	/*
	 * Get the Type Specific Flags (Byte5)
	 */
	buffer += 1;
	temp8 = *buffer;

	if (ACPI_MEMORY_RANGE == output_struct->data.address16.resource_type) {
		output_struct->data.address16.attribute.memory.read_write_attribute =
				(u16) (temp8 & 0x01);
		output_struct->data.address16.attribute.memory.cache_attribute =
				(u16) ((temp8 >> 1) & 0x03);
	}
	else {
		if (ACPI_IO_RANGE == output_struct->data.address16.resource_type) {
			output_struct->data.address16.attribute.io.range_attribute =
				(u16) (temp8 & 0x03);
			output_struct->data.address16.attribute.io.translation_attribute =
				(u16) ((temp8 >> 4) & 0x03);
		}
		else {
			/* BUS_NUMBER_RANGE == Address16.Data->resource_type */
			/* Nothing needs to be filled in */
		}
	}

	/*
	 * Get Granularity (Bytes 6-7)
	 */
	buffer += 1;
	ACPI_MOVE_16_TO_32 (&output_struct->data.address16.granularity, buffer);

	/*
	 * Get min_address_range (Bytes 8-9)
	 */
	buffer += 2;
	ACPI_MOVE_16_TO_32 (&output_struct->data.address16.min_address_range, buffer);

	/*
	 * Get max_address_range (Bytes 10-11)
	 */
	buffer += 2;
	ACPI_MOVE_16_TO_32 (&output_struct->data.address16.max_address_range, buffer);

	/*
	 * Get address_translation_offset (Bytes 12-13)
	 */
	buffer += 2;
	ACPI_MOVE_16_TO_32 (&output_struct->data.address16.address_translation_offset, buffer);

	/*
	 * Get address_length (Bytes 14-15)
	 */
	buffer += 2;
	ACPI_MOVE_16_TO_32 (&output_struct->data.address16.address_length, buffer);

	/*
	 * Resource Source Index (if present)
	 */
	buffer += 2;

	/*
	 * This will leave us pointing to the Resource Source Index
	 * If it is present, then save it off and calculate the
	 * pointer to where the null terminated string goes:
	 * Each Interrupt takes 32-bits + the 5 bytes of the
	 * stream that are default.
	 *
	 * Note: Some resource descriptors will have an additional null, so
	 * we add 1 to the length.
	 */
	if (*bytes_consumed > (16 + 1)) {
		/* Dereference the Index */

		temp8 = *buffer;
		output_struct->data.address16.resource_source.index = (u32) temp8;

		/* Point to the String */

		buffer += 1;

		/* Point the String pointer to the end of this structure */

		output_struct->data.address16.resource_source.string_ptr =
				(char *)((u8 * )output_struct + struct_size);

		temp_ptr = (u8 *) output_struct->data.address16.resource_source.string_ptr;

		/* Copy the string into the buffer */

		index = 0;

		while (0x00 != *buffer) {
			*temp_ptr = *buffer;

			temp_ptr += 1;
			buffer += 1;
			index += 1;
		}

		/*
		 * Add the terminating null
		 */
		*temp_ptr = 0x00;

		output_struct->data.address16.resource_source.string_length = index + 1;

		/*
		 * In order for the struct_size to fall on a 32-bit boundary,
		 * calculate the length of the string and expand the
		 * struct_size to the next 32-bit boundary.
		 */
		temp8 = (u8) (index + 1);
		struct_size += ACPI_ROUND_UP_to_32_bITS (temp8);
	}
	else {
		output_struct->data.address16.resource_source.index = 0x00;
		output_struct->data.address16.resource_source.string_length = 0;
		output_struct->data.address16.resource_source.string_ptr = NULL;
	}

	/*
	 * 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_address16_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_address16_stream (
	struct acpi_resource            *linked_list,
	u8                              **output_buffer,
	acpi_size                       *bytes_consumed)
{
	u8                              *buffer = *output_buffer;
	u8                              *length_field;
	u8                              temp8;
	char                            *temp_pointer = NULL;
	acpi_size                       actual_bytes;


	ACPI_FUNCTION_TRACE ("rs_address16_stream");


	/*
	 * The descriptor field is static
	 */
	*buffer = 0x88;
	buffer += 1;

	/*
	 * Save a pointer to the Length field - to be filled in later
	 */
	length_field = buffer;
	buffer += 2;

	/*
	 * Set the Resource Type (Memory, Io, bus_number)
	 */
	temp8 = (u8) (linked_list->data.address16.resource_type & 0x03);
	*buffer = temp8;
	buffer += 1;

	/*
	 * Set the general flags
	 */
	temp8 = (u8) (linked_list->data.address16.producer_consumer & 0x01);

	temp8 |= (linked_list->data.address16.decode & 0x01) << 1;
	temp8 |= (linked_list->data.address16.min_address_fixed & 0x01) << 2;
	temp8 |= (linked_list->data.address16.max_address_fixed & 0x01) << 3;

	*buffer = temp8;
	buffer += 1;

	/*
	 * Set the type specific flags
	 */
	temp8 = 0;

	if (ACPI_MEMORY_RANGE == linked_list->data.address16.resource_type) {
		temp8 = (u8)
			(linked_list->data.address16.attribute.memory.read_write_attribute &
			 0x01);

		temp8 |=
			(linked_list->data.address16.attribute.memory.cache_attribute &
			 0x03) << 1;
	}
	else if (ACPI_IO_RANGE == linked_list->data.address16.resource_type) {
		temp8 = (u8)
			(linked_list->data.address16.attribute.io.range_attribute &
			 0x03);
		temp8 |=
			(linked_list->data.address16.attribute.io.translation_attribute &
			 0x03) << 4;
	}

	*buffer = temp8;
	buffer += 1;

	/*
	 * Set the address space granularity
	 */
	ACPI_MOVE_32_TO_16 (buffer, &linked_list->data.address16.granularity);
	buffer += 2;

	/*
	 * Set the address range minimum
	 */
	ACPI_MOVE_32_TO_16 (buffer, &linked_list->data.address16.min_address_range);
	buffer += 2;

	/*
	 * Set the address range maximum
	 */
	ACPI_MOVE_32_TO_16 (buffer, &linked_list->data.address16.max_address_range);
	buffer += 2;

	/*
	 * Set the address translation offset
	 */
	ACPI_MOVE_32_TO_16 (buffer, &linked_list->data.address16.address_translation_offset);
	buffer += 2;

	/*
	 * Set the address length
	 */
	ACPI_MOVE_32_TO_16 (buffer, &linked_list->data.address16.address_length);
	buffer += 2;

	/*
	 * Resource Source Index and Resource Source are optional
	 */
	if (0 != linked_list->data.address16.resource_source.string_length) {
		temp8 = (u8) linked_list->data.address16.resource_source.index;

		*buffer = temp8;
		buffer += 1;