linux/drivers/acpi/resources/rsutils.c

/*******************************************************************************
 *
 * Module Name: rsutils - Utilities for the resource manager
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2006, 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/acnamesp.h>
#include <acpi/acresrc.h>

#define _COMPONENT          ACPI_RESOURCES
ACPI_MODULE_NAME("rsutils")

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_decode_bitmask
 *
 * PARAMETERS:  Mask            - Bitmask to decode
 *              List            - Where the converted list is returned
 *
 * RETURN:      Count of bits set (length of list)
 *
 * DESCRIPTION: Convert a bit mask into a list of values
 *
 ******************************************************************************/
u8 acpi_rs_decode_bitmask(u16 mask, u8 * list)
{
	acpi_native_uint i;
	u8 bit_count;

	ACPI_FUNCTION_ENTRY();

	/* Decode the mask bits */

	for (i = 0, bit_count = 0; mask; i++) {
		if (mask & 0x0001) {
			list[bit_count] = (u8) i;
			bit_count++;
		}

		mask >>= 1;
	}

	return (bit_count);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_encode_bitmask
 *
 * PARAMETERS:  List            - List of values to encode
 *              Count           - Length of list
 *
 * RETURN:      Encoded bitmask
 *
 * DESCRIPTION: Convert a list of values to an encoded bitmask
 *
 ******************************************************************************/

u16 acpi_rs_encode_bitmask(u8 * list, u8 count)
{
	acpi_native_uint i;
	u16 mask;

	ACPI_FUNCTION_ENTRY();

	/* Encode the list into a single bitmask */

	for (i = 0, mask = 0; i < count; i++) {
		mask |= (0x0001 << list[i]);
	}

	return (mask);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_move_data
 *
 * PARAMETERS:  Destination         - Pointer to the destination descriptor
 *              Source              - Pointer to the source descriptor
 *              item_count          - How many items to move
 *              move_type           - Byte width
 *
 * RETURN:      None
 *
 * DESCRIPTION: Move multiple data items from one descriptor to another. Handles
 *              alignment issues and endian issues if necessary, as configured
 *              via the ACPI_MOVE_* macros. (This is why a memcpy is not used)
 *
 ******************************************************************************/

void
acpi_rs_move_data(void *destination, void *source, u16 item_count, u8 move_type)
{
	acpi_native_uint i;

	ACPI_FUNCTION_ENTRY();

	/* One move per item */

	for (i = 0; i < item_count; i++) {
		switch (move_type) {
			/*
			 * For the 8-bit case, we can perform the move all at once
			 * since there are no alignment or endian issues
			 */
		case ACPI_RSC_MOVE8:
			ACPI_MEMCPY(destination, source, item_count);
			return;

			/*
			 * 16-, 32-, and 64-bit cases must use the move macros that perform
			 * endian conversion and/or accomodate hardware that cannot perform
			 * misaligned memory transfers
			 */
		case ACPI_RSC_MOVE16:
			ACPI_MOVE_16_TO_16(&ACPI_CAST_PTR(u16, destination)[i],
					   &ACPI_CAST_PTR(u16, source)[i]);
			break;

		case ACPI_RSC_MOVE32:
			ACPI_MOVE_32_TO_32(&ACPI_CAST_PTR(u32, destination)[i],
					   &ACPI_CAST_PTR(u32, source)[i]);
			break;

		case ACPI_RSC_MOVE64:
			ACPI_MOVE_64_TO_64(&ACPI_CAST_PTR(u64, destination)[i],
					   &ACPI_CAST_PTR(u64, source)[i]);
			break;

		default:
			return;
		}
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_set_resource_length
 *
 * PARAMETERS:  total_length        - Length of the AML descriptor, including
 *                                    the header and length fields.
 *              Aml                 - Pointer to the raw AML descriptor
 *
 * RETURN:      None
 *
 * DESCRIPTION: Set the resource_length field of an AML
 *              resource descriptor, both Large and Small descriptors are
 *              supported automatically. Note: Descriptor Type field must
 *              be valid.
 *
 ******************************************************************************/

void
acpi_rs_set_resource_length(acpi_rsdesc_size total_length,
			    union aml_resource *aml)
{
	acpi_rs_length resource_length;

	ACPI_FUNCTION_ENTRY();

	/* Length is the total descriptor length minus the header length */

	resource_length = (acpi_rs_length)
	    (total_length - acpi_ut_get_resource_header_length(aml));

	/* Length is stored differently for large and small descriptors */

	if (aml->small_header.descriptor_type & ACPI_RESOURCE_NAME_LARGE) {

		/* Large descriptor -- bytes 1-2 contain the 16-bit length */

		ACPI_MOVE_16_TO_16(&aml->large_header.resource_length,
				   &resource_length);
	} else {
		/* Small descriptor -- bits 2:0 of byte 0 contain the length */

		aml->small_header.descriptor_type = (u8)

		    /* Clear any existing length, preserving descriptor type bits */
		    ((aml->small_header.
		      descriptor_type & ~ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK)

		     | resource_length);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_set_resource_header
 *
 * PARAMETERS:  descriptor_type     - Byte to be inserted as the type
 *              total_length        - Length of the AML descriptor, including
 *                                    the header and length fields.
 *              Aml                 - Pointer to the raw AML descriptor
 *
 * RETURN:      None
 *
 * DESCRIPTION: Set the descriptor_type and resource_length fields of an AML
 *              resource descriptor, both Large and Small descriptors are
 *              supported automatically
 *
 ******************************************************************************/

void
acpi_rs_set_resource_header(u8 descriptor_type,
			    acpi_rsdesc_size total_length,
			    union aml_resource *aml)
{
	ACPI_FUNCTION_ENTRY();

	/* Set the Resource Type */

	aml->small_header.descriptor_type = descriptor_type;

	/* Set the Resource Length */

	acpi_rs_set_resource_length(total_length, aml);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_strcpy
 *
 * PARAMETERS:  Destination         - Pointer to the destination string
 *              Source              - Pointer to the source string
 *
 * RETURN:      String length, including NULL terminator
 *
 * DESCRIPTION: Local string copy that returns the string length, saving a
 *              strcpy followed by a strlen.
 *
 ******************************************************************************/

static u16 acpi_rs_strcpy(char *destination, char *source)
{
	u16 i;

	ACPI_FUNCTION_ENTRY();

	for (i = 0; source[i]; i++) {
		destination[i] = source[i];
	}

	destination[i] = 0;

	/* Return string length including the NULL terminator */

	return ((u16) (i + 1));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_resource_source
 *
 * PARAMETERS:  resource_length     - Length field of the descriptor
 *              minimum_length      - Minimum length of the descriptor (minus
 *                                    any optional fields)
 *              resource_source     - Where the resource_source is returned
 *              Aml                 - Pointer to the raw AML descriptor
 *              string_ptr          - (optional) where to store the actual
 *                                    resource_source string
 *
 * RETURN:      Length of the string plus NULL terminator, rounded up to native
 *              word boundary
 *
 * DESCRIPTION: Copy the optional resource_source data from a raw AML descriptor
 *              to an internal resource descriptor
 *
 ******************************************************************************/

acpi_rs_length
acpi_rs_get_resource_source(acpi_rs_length resource_length,
			    acpi_rs_length minimum_length,
			    struct acpi_resource_source * resource_source,
			    union aml_resource * aml, char *string_ptr)
{
	acpi_rsdesc_size total_length;
	u8 *aml_resource_source;

	ACPI_FUNCTION_ENTRY();

	total_length =
	    resource_length + sizeof(struct aml_resource_large_header);
	aml_resource_source = ACPI_ADD_PTR(u8, aml, minimum_length);

	/*
	 * resource_source is present if the length of the descriptor is longer than
	 * the minimum length.
	 *
	 * Note: Some resource descriptors will have an additional null, so
	 * we add 1 to the minimum length.
	 */
	if (total_length > (acpi_rsdesc_size) (minimum_length + 1)) {

		/* Get the resource_source_index */

		resource_source->index = aml_resource_source[0];

		resource_source->string_ptr = string_ptr;
		if (!string_ptr) {
			/*
			 * String destination pointer is not specified; Set the String
			 * pointer to the end of the current resource_source structure.
			 */
			resource_source->string_ptr =
			    ACPI_ADD_PTR(char, resource_source,
					 sizeof(struct acpi_resource_source));
		}

		/*
		 * In order for the Resource length to be a multiple of the native
		 * word, calculate the length of the string (+1 for NULL terminator)
		 * and expand to the next word multiple.
		 *
		 * Zero the entire area of the buffer.
		 */
		total_length =
		    (u32)
		    ACPI_STRLEN(ACPI_CAST_PTR(char, &aml_resource_source[1])) +
		    1;
		total_length = (u32) ACPI_ROUND_UP_TO_NATIVE_WORD(total_length);

		ACPI_MEMSET(resource_source->string_ptr, 0, total_length);

		/* Copy the resource_source string to the destination */

		resource_source->string_length =
		    acpi_rs_strcpy(resource_source->string_ptr,
				   ACPI_CAST_PTR(char,
						 &aml_resource_source[1]));

		return ((acpi_rs_length) total_length);
	}

	/* resource_source is not present */

	resource_source->index = 0;
	resource_source->string_length = 0;
	resource_source->string_ptr = NULL;
	return (0);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_set_resource_source
 *
 * PARAMETERS:  Aml                 - Pointer to the raw AML descriptor
 *              minimum_length      - Minimum length of the descriptor (minus
 *                                    any optional fields)
 *              resource_source     - Internal resource_source

 *
 * RETURN:      Total length of the AML descriptor
 *
 * DESCRIPTION: Convert an optional resource_source from internal format to a
 *              raw AML resource descriptor
 *
 ******************************************************************************/

acpi_rsdesc_size
acpi_rs_set_resource_source(union aml_resource * aml,
			    acpi_rs_length minimum_length,
			    struct acpi_resource_source * resource_source)
{
	u8 *aml_resource_source;
	acpi_rsdesc_size descriptor_length;

	ACPI_FUNCTION_ENTRY();

	descriptor_length = minimum_length;

	/* Non-zero string length indicates presence of a resource_source */

	if (resource_source->string_length) {

		/* Point to the end of the AML descriptor */

		aml_resource_source = ACPI_ADD_PTR(u8, aml, minimum_length);

		/* Copy the resource_source_index */

		aml_resource_source[0] = (u8) resource_source->index;

		/* Copy the resource_source string */

		ACPI_STRCPY(ACPI_CAST_PTR(char, &aml_resource_source[1]),
			    resource_source->string_ptr);

		/*
		 * Add the length of the string (+ 1 for null terminator) to the
		 * final descriptor length
		 */
		descriptor_length +=
		    ((acpi_rsdesc_size) resource_source->string_length + 1);
	}

	/* Return the new total length of the AML descriptor */

	return (descriptor_length);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_prt_method_data
 *
 * PARAMETERS:  Node            - Device node
 *              ret_buffer      - Pointer to a buffer structure for the
 *                                results
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the _PRT value of an object
 *              contained in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_prt_method_data(struct acpi_namespace_node * node,
			    struct acpi_buffer * ret_buffer)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(rs_get_prt_method_data);

	/* Parameters guaranteed valid by caller */

	/* Execute the method, no parameters */

	status = acpi_ut_evaluate_object(node, METHOD_NAME__PRT,
					 ACPI_BTYPE_PACKAGE, &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Create a resource linked list from the byte stream buffer that comes
	 * back from the _CRS method execution.
	 */
	status = acpi_rs_create_pci_routing_table(obj_desc, ret_buffer);

	/* On exit, we must delete the object returned by evaluate_object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_crs_method_data
 *
 * PARAMETERS:  Node            - Device node
 *              ret_buffer      - Pointer to a buffer structure for the
 *                                results
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the _CRS value of an object
 *              contained in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_crs_method_data(struct acpi_namespace_node *node,
			    struct acpi_buffer *ret_buffer)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(rs_get_crs_method_data);

	/* Parameters guaranteed valid by caller */

	/* Execute the method, no parameters */

	status = acpi_ut_evaluate_object(node, METHOD_NAME__CRS,
					 ACPI_BTYPE_BUFFER, &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Make the call to create a resource linked list from the
	 * byte stream buffer that comes back from the _CRS method
	 * execution.
	 */
	status = acpi_rs_create_resource_list(obj_desc, ret_buffer);

	/* On exit, we must delete the object returned by evaluate_object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_prs_method_data
 *
 * PARAMETERS:  Node            - Device node
 *              ret_buffer      - Pointer to a buffer structure for the
 *                                results
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the _PRS value of an object
 *              contained in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 ******************************************************************************/

#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_rs_get_prs_method_data(struct acpi_namespace_node *node,
			    struct acpi_buffer *ret_buffer)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(rs_get_prs_method_data);

	/* Parameters guaranteed valid by caller */

	/* Execute the method, no parameters */

	status = acpi_ut_evaluate_object(node, METHOD_NAME__PRS,
					 ACPI_BTYPE_BUFFER, &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Make the call to create a resource linked list from the
	 * byte stream buffer that comes back from the _CRS method
	 * execution.
	 */
	status = acpi_rs_create_resource_list(obj_desc, ret_buffer);

	/* On exit, we must delete the object returned by evaluate_object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}
#endif				/*  ACPI_FUTURE_USAGE  */

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_get_method_data
 *
 * PARAMETERS:  Handle          - Handle to the containing object
 *              Path            - Path to method, relative to Handle
 *              ret_buffer      - Pointer to a buffer structure for the
 *                                results
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the _CRS or _PRS value of an
 *              object contained in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 ******************************************************************************/

acpi_status
acpi_rs_get_method_data(acpi_handle handle,
			char *path, struct acpi_buffer *ret_buffer)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;

	ACPI_FUNCTION_TRACE(rs_get_method_data);

	/* Parameters guaranteed valid by caller */

	/* Execute the method, no parameters */

	status =
	    acpi_ut_evaluate_object(handle, path, ACPI_BTYPE_BUFFER, &obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/*
	 * Make the call to create a resource linked list from the
	 * byte stream buffer that comes back from the method
	 * execution.
	 */
	status = acpi_rs_create_resource_list(obj_desc, ret_buffer);

	/* On exit, we must delete the object returned by evaluate_object */

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_set_srs_method_data
 *
 * PARAMETERS:  Node            - Device node
 *              in_buffer       - Pointer to a buffer structure of the
 *                                parameter
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to set the _SRS of an object contained
 *              in an object specified by the handle passed in
 *
 *              If the function fails an appropriate status will be returned
 *              and the contents of the callers buffer is undefined.
 *
 * Note: Parameters guaranteed valid by caller
 *
 ******************************************************************************/

acpi_status
acpi_rs_set_srs_method_data(struct acpi_namespace_node *node,
			    struct acpi_buffer *in_buffer)
{
	struct acpi_evaluate_info *info;
	union acpi_operand_object *args[2];
	acpi_status status;
	struct acpi_buffer buffer;

	ACPI_FUNCTION_TRACE(rs_set_srs_method_data);

	/* Allocate and initialize the evaluation information block */

	info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
	if (!info) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	info->prefix_node = node;
	info->pathname = METHOD_NAME__SRS;
	info->parameters = args;
	info->parameter_type = ACPI_PARAM_ARGS;
	info->flags = ACPI_IGNORE_RETURN_VALUE;

	/*
	 * The in_buffer parameter will point to a linked list of
	 * resource parameters. It needs to be formatted into a
	 * byte stream to be sent in as an input parameter to _SRS
	 *
	 * Convert the linked list into a byte stream
	 */
	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
	status = acpi_rs_create_aml_resources(in_buffer->pointer, &buffer);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/* Create and initialize the method parameter object */

	args[0] = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
	if (!args[0]) {
		/*
		 * Must free the buffer allocated above (otherwise it is freed
		 * later)
		 */
		ACPI_FREE(buffer.pointer);
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	args[0]->buffer.length = (u32) buffer.length;
	args[0]->buffer.pointer = buffer.pointer;
	args[0]->common.flags = AOPOBJ_DATA_VALID;
	args[1] = NULL;

	/* Execute the method, no return value is expected */

	status = acpi_ns_evaluate(info);

	/* Clean up and return the status from acpi_ns_evaluate */

	acpi_ut_remove_reference(args[0]);

      cleanup:
	ACPI_FREE(info);
	return_ACPI_STATUS(status);
}