/*******************************************************************************
   *
   * Module Name: rscreate - Create resource lists/tables
   *
   ******************************************************************************/
  
  /*
   * Copyright (C) 2000 - 2015, Intel Corp.
   * 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 "accommon.h"
  #include "acresrc.h"
  #include "acnamesp.h"
  
  #define _COMPONENT          ACPI_RESOURCES
  ACPI_MODULE_NAME("rscreate")
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_buffer_to_resource
   *
   * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
   *              aml_buffer_length   - Length of the aml_buffer
   *              resource_ptr        - Where the converted resource is returned
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Convert a raw AML buffer to a resource list
   *
   ******************************************************************************/
  acpi_status
  acpi_buffer_to_resource(u8 *aml_buffer,
  			u16 aml_buffer_length,
  			struct acpi_resource **resource_ptr)
  {
  	acpi_status status;
  	acpi_size list_size_needed;
  	void *resource;
  	void *current_resource_ptr;
  
  	ACPI_FUNCTION_TRACE(acpi_buffer_to_resource);
  
  	/*
  	 * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
  	 * is not required here.
  	 */
  
  	/* Get the required length for the converted resource */
  
  	status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
  					 &list_size_needed);
  	if (status == AE_AML_NO_RESOURCE_END_TAG) {
  		status = AE_OK;
  	}
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	/* Allocate a buffer for the converted resource */
  
  	resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
  	current_resource_ptr = resource;
  	if (!resource) {
  		return_ACPI_STATUS(AE_NO_MEMORY);
  	}
  
  	/* Perform the AML-to-Resource conversion */
  
  	status = acpi_ut_walk_aml_resources(NULL, aml_buffer, aml_buffer_length,
  					    acpi_rs_convert_aml_to_resources,
  					    &current_resource_ptr);
  	if (status == AE_AML_NO_RESOURCE_END_TAG) {
  		status = AE_OK;
  	}
  	if (ACPI_FAILURE(status)) {
  		ACPI_FREE(resource);
  	} else {
  		*resource_ptr = resource;
  	}
  
  	return_ACPI_STATUS(status);
  }
  
  ACPI_EXPORT_SYMBOL(acpi_buffer_to_resource)
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_rs_create_resource_list
   *
   * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
   *              output_buffer       - Pointer to the user's buffer
   *
   * RETURN:      Status: AE_OK if okay, else a valid acpi_status code
   *              If output_buffer is not large enough, output_buffer_length
   *              indicates how large output_buffer should be, else it
   *              indicates how may u8 elements of output_buffer are valid.
   *
   * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
   *              execution and parses the stream to create a linked list
   *              of device resources.
   *
   ******************************************************************************/
  acpi_status
  acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer,
  			     struct acpi_buffer *output_buffer)
  {
  
  	acpi_status status;
  	u8 *aml_start;
  	acpi_size list_size_needed = 0;
  	u32 aml_buffer_length;
  	void *resource;
  
  	ACPI_FUNCTION_TRACE(rs_create_resource_list);
  
  	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p
  ", aml_buffer));
  
  	/* Params already validated, so we don't re-validate here */
  
  	aml_buffer_length = aml_buffer->buffer.length;
  	aml_start = aml_buffer->buffer.pointer;
  
  	/*
  	 * Pass the aml_buffer into a module that can calculate
  	 * the buffer size needed for the linked list
  	 */
  	status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
  					 &list_size_needed);
  
  	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X
  ",
  			  status, (u32) list_size_needed));
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	/* Validate/Allocate/Clear caller buffer */
  
  	status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	/* Do the conversion */
  
  	resource = output_buffer->pointer;
  	status = acpi_ut_walk_aml_resources(NULL, aml_start, aml_buffer_length,
  					    acpi_rs_convert_aml_to_resources,
  					    &resource);
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X
  ",
  			  output_buffer->pointer, (u32) output_buffer->length));
  	return_ACPI_STATUS(AE_OK);
  }
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_rs_create_pci_routing_table
   *
   * PARAMETERS:  package_object          - Pointer to a package containing one
   *                                        of more ACPI_OPERAND_OBJECTs
   *              output_buffer           - Pointer to the user's buffer
   *
   * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
   *              If the output_buffer is too small, the error will be
   *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
   *              to the size buffer needed.
   *
   * DESCRIPTION: Takes the union acpi_operand_object package and creates a
   *              linked list of PCI interrupt descriptions
   *
   * NOTE: It is the caller's responsibility to ensure that the start of the
   * output buffer is aligned properly (if necessary).
   *
   ******************************************************************************/
  
  acpi_status
  acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
  				 struct acpi_buffer *output_buffer)
  {
  	u8 *buffer;
  	union acpi_operand_object **top_object_list;
  	union acpi_operand_object **sub_object_list;
  	union acpi_operand_object *obj_desc;
  	acpi_size buffer_size_needed = 0;
  	u32 number_of_elements;
  	u32 index;
  	struct acpi_pci_routing_table *user_prt;
  	struct acpi_namespace_node *node;
  	acpi_status status;
  	struct acpi_buffer path_buffer;
  
  	ACPI_FUNCTION_TRACE(rs_create_pci_routing_table);
  
  	/* Params already validated, so we don't re-validate here */
  
  	/* Get the required buffer length */
  
  	status = acpi_rs_get_pci_routing_table_length(package_object,
  						      &buffer_size_needed);
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X
  ",
  			  (u32) buffer_size_needed));
  
  	/* Validate/Allocate/Clear caller buffer */
  
  	status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	/*
  	 * Loop through the ACPI_INTERNAL_OBJECTS - Each object should be a
  	 * package that in turn contains an u64 Address, a u8 Pin,
  	 * a Name, and a u8 source_index.
  	 */
  	top_object_list = package_object->package.elements;
  	number_of_elements = package_object->package.count;
  	buffer = output_buffer->pointer;
  	user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
  
  	for (index = 0; index < number_of_elements; index++) {
  
  		/*
  		 * Point user_prt past this current structure
  		 *
  		 * NOTE: On the first iteration, user_prt->Length will
  		 * be zero because we cleared the return buffer earlier
  		 */
  		buffer += user_prt->length;
  		user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
  
  		/*
  		 * Fill in the Length field with the information we have at this point.
  		 * The minus four is to subtract the size of the u8 Source[4] member
  		 * because it is added below.
  		 */
  		user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
  
  		/* Each subpackage must be of length 4 */
  
  		if ((*top_object_list)->package.count != 4) {
  			ACPI_ERROR((AE_INFO,
  				    "(PRT[%u]) Need package of length 4, found length %u",
  				    index, (*top_object_list)->package.count));
  			return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
  		}
  
  		/*
  		 * Dereference the subpackage.
  		 * The sub_object_list will now point to an array of the four IRQ
  		 * elements: [Address, Pin, Source, source_index]
  		 */
  		sub_object_list = (*top_object_list)->package.elements;
  
  		/* 1) First subobject: Dereference the PRT.Address */
  
  		obj_desc = sub_object_list[0];
  		if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
  			ACPI_ERROR((AE_INFO,
  				    "(PRT[%u].Address) Need Integer, found %s",
  				    index,
  				    acpi_ut_get_object_type_name(obj_desc)));
  			return_ACPI_STATUS(AE_BAD_DATA);
  		}
  
  		user_prt->address = obj_desc->integer.value;
  
  		/* 2) Second subobject: Dereference the PRT.Pin */
  
  		obj_desc = sub_object_list[1];
  		if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
  			ACPI_ERROR((AE_INFO,
  				    "(PRT[%u].Pin) Need Integer, found %s",
  				    index,
  				    acpi_ut_get_object_type_name(obj_desc)));
  			return_ACPI_STATUS(AE_BAD_DATA);
  		}
  
  		user_prt->pin = (u32) obj_desc->integer.value;
  
  		/*
  		 * 3) Third subobject: Dereference the PRT.source_name
  		 * The name may be unresolved (slack mode), so allow a null object
  		 */
  		obj_desc = sub_object_list[2];
  		if (obj_desc) {
  			switch (obj_desc->common.type) {
  			case ACPI_TYPE_LOCAL_REFERENCE:
  
  				if (obj_desc->reference.class !=
  				    ACPI_REFCLASS_NAME) {
  					ACPI_ERROR((AE_INFO,
  						    "(PRT[%u].Source) Need name, found Reference Class 0x%X",
  						    index,
  						    obj_desc->reference.class));
  					return_ACPI_STATUS(AE_BAD_DATA);
  				}
  
  				node = obj_desc->reference.node;
  
  				/* Use *remaining* length of the buffer as max for pathname */
  
  				path_buffer.length = output_buffer->length -
  				    (u32) ((u8 *) user_prt->source -
  					   (u8 *) output_buffer->pointer);
  				path_buffer.pointer = user_prt->source;
  
  				status =
  				    acpi_ns_handle_to_pathname((acpi_handle)
  							       node,
  							       &path_buffer,
  							       FALSE);
  
  				/* +1 to include null terminator */
  
  				user_prt->length +=
  				    (u32)strlen(user_prt->source) + 1;
  				break;
  
  			case ACPI_TYPE_STRING:
  
  				strcpy(user_prt->source,
  				       obj_desc->string.pointer);
  
  				/*
  				 * Add to the Length field the length of the string
  				 * (add 1 for terminator)
  				 */
  				user_prt->length += obj_desc->string.length + 1;
  				break;
  
  			case ACPI_TYPE_INTEGER:
  				/*
  				 * If this is a number, then the Source Name is NULL, since the
  				 * entire buffer was zeroed out, we can leave this alone.
  				 *
  				 * Add to the Length field the length of the u32 NULL
  				 */
  				user_prt->length += sizeof(u32);
  				break;
  
  			default:
  
  				ACPI_ERROR((AE_INFO,
  					    "(PRT[%u].Source) Need Ref/String/Integer, found %s",
  					    index,
  					    acpi_ut_get_object_type_name
  					    (obj_desc)));
  				return_ACPI_STATUS(AE_BAD_DATA);
  			}
  		}
  
  		/* Now align the current length */
  
  		user_prt->length =
  		    (u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length);
  
  		/* 4) Fourth subobject: Dereference the PRT.source_index */
  
  		obj_desc = sub_object_list[3];
  		if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
  			ACPI_ERROR((AE_INFO,
  				    "(PRT[%u].SourceIndex) Need Integer, found %s",
  				    index,
  				    acpi_ut_get_object_type_name(obj_desc)));
  			return_ACPI_STATUS(AE_BAD_DATA);
  		}
  
  		user_prt->source_index = (u32) obj_desc->integer.value;
  
  		/* Point to the next union acpi_operand_object in the top level package */
  
  		top_object_list++;
  	}
  
  	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X
  ",
  			  output_buffer->pointer, (u32) output_buffer->length));
  	return_ACPI_STATUS(AE_OK);
  }
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_rs_create_aml_resources
   *
   * PARAMETERS:  resource_list           - Pointer to the resource list buffer
   *              output_buffer           - Where the AML buffer is returned
   *
   * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
   *              If the output_buffer is too small, the error will be
   *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
   *              to the size buffer needed.
   *
   * DESCRIPTION: Converts a list of device resources to an AML bytestream
   *              to be used as input for the _SRS control method.
   *
   ******************************************************************************/
  
  acpi_status
  acpi_rs_create_aml_resources(struct acpi_buffer *resource_list,
  			     struct acpi_buffer *output_buffer)
  {
  	acpi_status status;
  	acpi_size aml_size_needed = 0;
  
  	ACPI_FUNCTION_TRACE(rs_create_aml_resources);
  
  	/* Params already validated, no need to re-validate here */
  
  	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ResourceList Buffer = %p
  ",
  			  resource_list->pointer));
  
  	/* Get the buffer size needed for the AML byte stream */
  
  	status = acpi_rs_get_aml_length(resource_list->pointer,
  					resource_list->length,
  					&aml_size_needed);
  
  	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s
  ",
  			  (u32)aml_size_needed, acpi_format_exception(status)));
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	/* Validate/Allocate/Clear caller buffer */
  
  	status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	/* Do the conversion */
  
  	status = acpi_rs_convert_resources_to_aml(resource_list->pointer,
  						  aml_size_needed,
  						  output_buffer->pointer);
  	if (ACPI_FAILURE(status)) {
  		return_ACPI_STATUS(status);
  	}
  
  	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X
  ",
  			  output_buffer->pointer, (u32) output_buffer->length));
  	return_ACPI_STATUS(AE_OK);
  }