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/*
* Copyright (c) 2014, Mentor Graphics Corporation
* 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.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of Mentor Graphics Corporation nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE.
*/
/**************************************************************************
* FILE NAME
*
* sh_mem.c
*
* COMPONENT
*
* IPC Stack for uAMP systems.
*
* DESCRIPTION
*
* Header file for fixed buffer size memory management service. Currently
* it is being used to manage shared memory.
*
**************************************************************************/
#ifndef SH_MEM_H_
#define SH_MEM_H_
#include "../../porting/env/env.h"
/* Macros */
#define BITMAP_WORD_SIZE 32
#define WORD_SIZE sizeof(unsigned long)
#define WORD_ALIGN(a) (((a) & (WORD_SIZE-1)) != 0)? \
(((a) & (~(WORD_SIZE-1))) + 4):(a)
/*
* This structure represents a shared memory pool.
*
* @start_addr - start address of shared memory region
* @lock - lock to ensure exclusive access
* @size - size of shared memory*
* @buff_size - size of each buffer
* @total_buffs - total number of buffers in shared memory region
* @used_buffs - number of used buffers
* @bmp_size - size of bitmap array
* @bitmap - array to keep record of free and used blocks
*
*/
struct sh_mem_pool {
void *start_addr;
LOCK *lock;
int size;
int buff_size;
int total_buffs;
int used_buffs;
int bmp_size;
unsigned long bitmap[0];
};
/* APIs */
struct sh_mem_pool *sh_mem_create_pool(void *start_addr, unsigned int size,
unsigned int buff_size);
void sh_mem_delete_pool(struct sh_mem_pool *pool);
void *sh_mem_get_buffer(struct sh_mem_pool *pool);
void sh_mem_free_buffer(void *ptr, struct sh_mem_pool *pool);
unsigned int get_first_zero_bit(unsigned long value);
#endif /* SH_MEM_H_ */
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