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/*
* Copyright (C) 2010-2011 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained from Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* @file ump_kernel_descriptor_mapping.h
*/
#ifndef __UMP_KERNEL_DESCRIPTOR_MAPPING_H__
#define __UMP_KERNEL_DESCRIPTOR_MAPPING_H__
#include "mali_osk.h"
/**
* The actual descriptor mapping table, never directly accessed by clients
*/
typedef struct ump_descriptor_table
{
u32 * usage; /**< Pointer to bitpattern indicating if a descriptor is valid/used or not */
void** mappings; /**< Array of the pointers the descriptors map to */
} ump_descriptor_table;
/**
* The descriptor mapping object
* Provides a separate namespace where we can map an integer to a pointer
*/
typedef struct ump_descriptor_mapping
{
_mali_osk_lock_t *lock; /**< Lock protecting access to the mapping object */
int max_nr_mappings_allowed; /**< Max number of mappings to support in this namespace */
int current_nr_mappings; /**< Current number of possible mappings */
ump_descriptor_table * table; /**< Pointer to the current mapping table */
} ump_descriptor_mapping;
/**
* Create a descriptor mapping object
* Create a descriptor mapping capable of holding init_entries growable to max_entries
* @param init_entries Number of entries to preallocate memory for
* @param max_entries Number of entries to max support
* @return Pointer to a descriptor mapping object, NULL on failure
*/
ump_descriptor_mapping * ump_descriptor_mapping_create(int init_entries, int max_entries);
/**
* Destroy a descriptor mapping object
* @param map The map to free
*/
void ump_descriptor_mapping_destroy(ump_descriptor_mapping * map);
/**
* Allocate a new mapping entry (descriptor ID)
* Allocates a new entry in the map.
* @param map The map to allocate a new entry in
* @param target The value to map to
* @return The descriptor allocated, a negative value on error
*/
int ump_descriptor_mapping_allocate_mapping(ump_descriptor_mapping * map, void * target);
/**
* Get the value mapped to by a descriptor ID
* @param map The map to lookup the descriptor id in
* @param descriptor The descriptor ID to lookup
* @param target Pointer to a pointer which will receive the stored value
* @return 0 on successful lookup, negative on error
*/
int ump_descriptor_mapping_get(ump_descriptor_mapping * map, int descriptor, void** target);
/**
* Set the value mapped to by a descriptor ID
* @param map The map to lookup the descriptor id in
* @param descriptor The descriptor ID to lookup
* @param target Pointer to replace the current value with
* @return 0 on successful lookup, negative on error
*/
int ump_descriptor_mapping_set(ump_descriptor_mapping * map, int descriptor, void * target);
/**
* Free the descriptor ID
* For the descriptor to be reused it has to be freed
* @param map The map to free the descriptor from
* @param descriptor The descriptor ID to free
*/
void ump_descriptor_mapping_free(ump_descriptor_mapping * map, int descriptor);
#endif /* __UMP_KERNEL_DESCRIPTOR_MAPPING_H__ */
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