xref: /freebsd-9.3-release/sys/dev/isci/scil/sci_base_memory_descriptor_list.h

/*-
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * BSD LICENSE
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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#ifndef _SCI_BASE_MEMORY_DESCRIPTOR_LIST_H_
#define _SCI_BASE_MEMORY_DESCRIPTOR_LIST_H_

/**
 * @file
 *
 * @brief This file contains the protected interface structures, constants
 *        and interface methods for the SCI_BASE_MEMORY_DESCRIPTOR_LIST
 *        object.
 */

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

#include <dev/isci/scil/sci_types.h>
#include <dev/isci/scil/sci_memory_descriptor_list.h>


/**
 * @struct SCI_BASE_MEMORY_DESCRIPTOR_LIST
 *
 * @brief This structure contains all of the fields necessary to implement
 *        a simple stack for managing the list of available controller indices.
 */
typedef struct SCI_BASE_MEMORY_DESCRIPTOR_LIST
{
   /**
    * This field indicates the length of the memory descriptor entry array.
    */
   U32  length;

   /**
    * This field is utilized to provide iterator pattern functionality.
    * It indicates the index of the next memory descriptor in the iteration.
    */
   U32  next_index;

   /**
    * This field will point to the list of memory descriptors.
    */
   SCI_PHYSICAL_MEMORY_DESCRIPTOR_T * mde_array;

   /**
    * This field simply allows a user to chain memory descriptor lists
    * together if desired.  This field will be initialized to
    * SCI_INVALID_HANDLE.
    */
   SCI_MEMORY_DESCRIPTOR_LIST_HANDLE_T  next_mdl;

} SCI_BASE_MEMORY_DESCRIPTOR_LIST_T;

/**
 * @brief This method is invoked to construct an memory descriptor list.
 *        It initializes the fields of the MDL.
 *
 * @param[in]  mdl This parameter specifies the memory descriptor list
 *             to be constructed.
 * @param[in]  mde_array This parameter specifies the array of memory
 *             descriptor entries to be managed by this list.
 * @param[in]  mde_array_length This parameter specifies the size of the
 *             array of entries.
 * @param[in]  next_mdl This parameter specifies a subsequent MDL object
 *             to be managed by this MDL object.
 *
 * @return none.
 */
void sci_base_mdl_construct(
   SCI_BASE_MEMORY_DESCRIPTOR_LIST_T * mdl,
   SCI_PHYSICAL_MEMORY_DESCRIPTOR_T  * mde_array,
   U32                                 mde_array_length,
   SCI_MEMORY_DESCRIPTOR_LIST_HANDLE_T next_mdl
);

/**
 * This macro constructs an memory descriptor entry with the given
 * alignment and size
 */
#define sci_base_mde_construct(mde, alignment, size, attributes) \
{ \
   (mde)->constant_memory_alignment  = (alignment); \
   (mde)->constant_memory_size       = (size); \
   (mde)->constant_memory_attributes = (attributes); \
}

/**
 * @brief This method validates that the memory descriptor is correctly
 *        filled out by the SCI User
 *
 * @param[in] mde This parameter is the mde entry to validate
 * @param[in] alignment This parameter specifies the expected alignment of
 *            the memory for the mde.
 * @param[in] size This parameter specifies the memory size expected for
 *            the mde its value should not have been changed by the SCI
 *            User.
 * @param[in] attributes This parameter specifies the attributes for the
 *            memory descriptor provided.
 *
 * @return BOOL This method returns an indication as to whether the
 *              supplied MDE is valid or not.
 * @retval TRUE The MDE is valid.
 * @retval FALSE The MDE is not valid.
 */
BOOL sci_base_mde_is_valid(
   SCI_PHYSICAL_MEMORY_DESCRIPTOR_T *mde,
   U32                               alignment,
   U32                               size,
   U16                               attributes
);

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // _SCI_BASE_MEMORY_DESCRIPTOR_LIST_H_