rsaddr.c

linux-2.6.15.6

/*******************************************************************************
 *
 * 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 & 0x03);

		/* Translations (_TTP and _TRS) - flag bits[5:4] */

		resource->address.attribute.io.translation_attribute =
		    (u16) ((flags >> 4) & 0x03);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_encode_specific_flags
 *
 * PARAMETERS:  Resource            - Address resource data struct
 *
 * RETURN:      Encoded type-specific flag byte
 *
 * DESCRIPTION: Construct a type-specific flag byte from an attribute struct.
 *              Type-specific flags are only defined for the Memory and IO
 *              resource types.
 *
 ******************************************************************************/

static u8 acpi_rs_encode_specific_flags(union acpi_resource_data *resource)
{
	u8 flags = 0;

	ACPI_FUNCTION_ENTRY();

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

		flags = (u8)
		    (resource->address.attribute.memory.
		     read_write_attribute & 0x01);

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

		flags |= (u8)
		    ((resource->address.attribute.memory.
		      cache_attribute & 0x03) << 1);
	} else if (resource->address.resource_type == ACPI_IO_RANGE) {
		/* Ranges (_RNG) - flag bits[1:0] */

		flags = (u8)
		    (resource->address.attribute.io.range_attribute & 0x03);

		/* Translations (_TTP and _TRS) - flag bits[5:4] */

		flags |= (u8)
		    ((resource->address.attribute.io.
		      translation_attribute & 0x03) << 4);
	}

	return (flags);
}

/*******************************************************************************
 *
 * 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)
{
	u32 index;
	u16 temp16;
	u8 temp8;
	u8 *temp_ptr;
	u8 *buffer = byte_stream_buffer;
	struct acpi_resource *output_struct = (void *)*output_buffer;
	acpi_size struct_size =
	    ACPI_SIZEOF_RESOURCE(struct acpi_resource_address16);

	ACPI_FUNCTION_TRACE("rs_address16_resource");

	/* Get the Descriptor Length field */

	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 and 0xC0-0xFF are valid */

	if ((temp8 > 2) && (temp8 < 0xC0)) {
		return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
	}

	output_struct->data.address16.resource_type = temp8;

	/* Get the General Flags (Byte4) */

	buffer += 1;
	acpi_rs_decode_general_flags(&output_struct->data, *buffer);

	/* Get the Type Specific Flags (Byte5) */

	buffer += 1;
	acpi_rs_decode_specific_flags(&output_struct->data, *buffer);

	/* 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 */

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

		/* 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 resource_source string into the buffer */

		index = 0;
		while (*buffer) {
			*temp_ptr = *buffer;

			temp_ptr++;
			buffer++;
			index++;
		}

		/* Add the terminating null and set the string length */

		*temp_ptr = 0;
		output_struct->data.address16.resource_source.string_length =