rscalc.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: rscalc - Calculate stream and list lengths
 *              $Revision: 32 $
 *
 ******************************************************************************/

/*
 *  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"
#include "amlcode.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_RESOURCES
	 MODULE_NAME         ("rscalc")


/*******************************************************************************
 *
 * FUNCTION:    Acpi_rs_calculate_byte_stream_length
 *
 * PARAMETERS:  Linked_list         - Pointer to the resource linked list
 *              Size_needed         - u32 pointer of the size buffer needed
 *                                    to properly return the parsed data
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Takes the resource byte stream and parses it once, calculating
 *              the size buffer needed to hold the linked list that conveys
 *              the resource data.
 *
 ******************************************************************************/

acpi_status
acpi_rs_calculate_byte_stream_length (
	acpi_resource           *linked_list,
	u32                     *size_needed)
{
	u32                     byte_stream_size_needed = 0;
	u32                     segment_size;
	acpi_resource_ext_irq   *ex_irq = NULL;
	u8                      done = FALSE;


	FUNCTION_TRACE ("Rs_calculate_byte_stream_length");


	while (!done) {
		/*
		 * Init the variable that will hold the size to add to the total.
		 */
		segment_size = 0;

		switch (linked_list->id) {
		case ACPI_RSTYPE_IRQ:
			/*
			 * IRQ Resource
			 * For an IRQ Resource, Byte 3, although optional, will
			 * always be created - it holds IRQ information.
			 */
			segment_size = 4;
			break;

		case ACPI_RSTYPE_DMA:
			/*
			 * DMA Resource
			 * For this resource the size is static
			 */
			segment_size = 3;
			break;

		case ACPI_RSTYPE_START_DPF:
			/*
			 * Start Dependent Functions Resource
			 * For a Start_dependent_functions Resource, Byte 1,
			 * although optional, will always be created.
			 */
			segment_size = 2;
			break;

		case ACPI_RSTYPE_END_DPF:
			/*
			 * End Dependent Functions Resource
			 * For this resource the size is static
			 */
			segment_size = 1;
			break;

		case ACPI_RSTYPE_IO:
			/*
			 * IO Port Resource
			 * For this resource the size is static
			 */
			segment_size = 8;
			break;

		case ACPI_RSTYPE_FIXED_IO:
			/*
			 * Fixed IO Port Resource
			 * For this resource the size is static
			 */
			segment_size = 4;
			break;

		case ACPI_RSTYPE_VENDOR:
			/*
			 * Vendor Defined Resource
			 * For a Vendor Specific resource, if the Length is
			 * between 1 and 7 it will be created as a Small
			 * Resource data type, otherwise it is a Large
			 * Resource data type.
			 */
			if (linked_list->data.vendor_specific.length > 7) {
				segment_size = 3;
			}
			else {
				segment_size = 1;
			}
			segment_size += linked_list->data.vendor_specific.length;
			break;

		case ACPI_RSTYPE_END_TAG:
			/*
			 * End Tag
			 * For this resource the size is static
			 */
			segment_size = 2;
			done = TRUE;
			break;

		case ACPI_RSTYPE_MEM24:
			/*
			 * 24-Bit Memory Resource
			 * For this resource the size is static
			 */
			segment_size = 12;
			break;

		case ACPI_RSTYPE_MEM32:
			/*
			 * 32-Bit Memory Range Resource
			 * For this resource the size is static
			 */
			segment_size = 20;
			break;

		case ACPI_RSTYPE_FIXED_MEM32:
			/*
			 * 32-Bit Fixed Memory Resource
			 * For this resource the size is static
			 */
			segment_size = 12;
			break;

		case ACPI_RSTYPE_ADDRESS16:
			/*
			 * 16-Bit Address Resource
			 * The base size of this byte stream is 16. If a
			 * Resource Source string is not NULL, add 1 for
			 * the Index + the length of the null terminated
			 * string Resource Source + 1 for the null.
			 */
			segment_size = 16;

			if (NULL != linked_list->data.address16.resource_source.string_ptr) {
				segment_size += (1 +
					linked_list->data.address16.resource_source.string_length);
			}
			break;

		case ACPI_RSTYPE_ADDRESS32:
			/*
			 * 32-Bit Address Resource
			 * The base size of this byte stream is 26. If a Resource
			 * Source string is not NULL, add 1 for the Index + the
			 * length of the null terminated string Resource Source +
			 * 1 for the null.
			 */
			segment_size = 26;

			if (NULL != linked_list->data.address32.resource_source.string_ptr) {
				segment_size += (1 +
					linked_list->data.address32.resource_source.string_length);
			}
			break;

		case ACPI_RSTYPE_ADDRESS64:
			/*
			 * 64-Bit Address Resource
			 * The base size of this byte stream is 46. If a Resource
			 * Source string is not NULL, add 1 for the Index + the
			 * length of the null terminated string Resource Source +
			 * 1 for the null.
			 */
			segment_size = 46;

			if (NULL != linked_list->data.address64.resource_source.string_ptr) {
				segment_size += (1 +
					linked_list->data.address64.resource_source.string_length);
			}
			break;

		case ACPI_RSTYPE_EXT_IRQ:
			/*
			 * Extended IRQ Resource
			 * The base size of this byte stream is 9. This is for an
			 * Interrupt table length of 1.  For each additional
			 * interrupt, add 4.
			 * If a Resource Source string is not NULL, add 1 for the
			 * Index + the length of the null terminated string
			 * Resource Source + 1 for the null.
			 */
			segment_size = 9 +
				((linked_list->data.extended_irq.number_of_interrupts - 1) * 4);

			if (NULL != ex_irq->resource_source.string_ptr) {
				segment_size += (1 +
					linked_list->data.extended_irq.resource_source.string_length);
			}
			break;

		default:
			/*
			 * If we get here, everything is out of sync,
			 * so exit with an error
			 */
			return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
			break;

		} /* switch (Linked_list->Id) */

		/*
		 * Update the total
		 */
		byte_stream_size_needed += segment_size;

		/*
		 * Point to the next object
		 */
		linked_list = POINTER_ADD (acpi_resource,
				  linked_list, linked_list->length);
	}

	/*
	 * This is the data the caller needs
	 */
	*size_needed = byte_stream_size_needed;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_rs_calculate_list_length
 *
 * PARAMETERS:  Byte_stream_buffer      - Pointer to the resource byte stream
 *              Byte_stream_buffer_length - Size of Byte_stream_buffer
 *              Size_needed             - u32 pointer of the size buffer
 *                                        needed to properly return the
 *                                        parsed data
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Takes the resource byte stream and parses it once, calculating
 *              the size buffer needed to hold the linked list that conveys
 *              the resource data.
 *
 ******************************************************************************/

acpi_status
acpi_rs_calculate_list_length (
	u8                      *byte_stream_buffer,
	u32                     byte_stream_buffer_length,
	u32                     *size_needed)
{
	u32                     buffer_size = 0;
	u32                     bytes_parsed = 0;
	u8                      number_of_interrupts = 0;
	u8                      number_of_channels = 0;
	u8                      resource_type;
	u32                     structure_size;
	u32                     bytes_consumed;
	u8                      *buffer;
	u8                      temp8;
	u16                     temp16;
	u8                      index;
	u8                      additional_bytes;


	FUNCTION_TRACE ("Rs_calculate_list_length");


	while (bytes_parsed < byte_stream_buffer_length) {
		/*
		 * The next byte in the stream is the resource type
		 */
		resource_type = acpi_rs_get_resource_type (*byte_stream_buffer);

		switch (resource_type) {
		case RESOURCE_DESC_MEMORY_24:
			/*
			 * 24-Bit Memory Resource
			 */
			bytes_consumed = 12;

			structure_size = SIZEOF_RESOURCE (acpi_resource_mem24);
			break;


		case RESOURCE_DESC_LARGE_VENDOR:
			/*
			 * Vendor Defined Resource
			 */
			buffer = byte_stream_buffer;
			++buffer;

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

			/*
			 * Ensure a 32-bit boundary for the structure
			 */
			temp16 = (u16) ROUND_UP_TO_32_bITS (temp16);

			structure_size = SIZEOF_RESOURCE (acpi_resource_vendor) +
					   (temp16 * sizeof (u8));
			break;


		case RESOURCE_DESC_MEMORY_32:
			/*
			 * 32-Bit Memory Range Resource
			 */

			bytes_consumed = 20;

			structure_size = SIZEOF_RESOURCE (acpi_resource_mem32);
			break;


		case RESOURCE_DESC_FIXED_MEMORY_32:
			/*
			 * 32-Bit Fixed Memory Resource
			 */
			bytes_consumed = 12;

			structure_size = SIZEOF_RESOURCE (acpi_resource_fixed_mem32);
			break;


		case RESOURCE_DESC_QWORD_ADDRESS_SPACE:
			/*
			 * 64-Bit Address Resource
			 */
			buffer = byte_stream_buffer;

			++buffer;
			MOVE_UNALIGNED16_TO_16 (&temp16, buffer);

			bytes_consumed = temp16 + 3;

			/*
			 * Resource Source Index and Resource Source are
			 * optional elements.  Check the length of the
			 * Bytestream.  If it is greater than 43, that
			 * means that an Index exists and is followed by
			 * a null termininated string.  Therefore, set
			 * the temp variable to the length minus the minimum
			 * byte stream length plus the byte for the Index to
			 * determine the size of the NULL terminiated string.
			 */
			if (43 < temp16) {
				temp8 = (u8) (temp16 - 44);
			}
			else {
				temp8 = 0;
			}

			/*
			 * Ensure a 64-bit boundary for the structure
			 */
			temp8 = (u8) ROUND_UP_TO_64_bITS (temp8);

			structure_size = SIZEOF_RESOURCE (acpi_resource_address64) +
					   (temp8 * sizeof (u8));
			break;


		case RESOURCE_DESC_DWORD_ADDRESS_SPACE:
			/*
			 * 32-Bit Address Resource
			 */
			buffer = byte_stream_buffer;

			++buffer;
			MOVE_UNALIGNED16_TO_16 (&temp16, buffer);

			bytes_consumed = temp16 + 3;

			/*
			 * Resource Source Index and Resource Source are