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/****************************************************************************
* include/nuttx/gran.h
* General purpose granule memory allocator.
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 NuttX 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 OWNER 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.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_GRAN_H
#define __INCLUDE_NUTTX_GRAN_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#ifdef CONFIG_GRAN
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* CONFIG_GRAN - Enable granual allocator support
* CONFIG_GRAN_SINGLE - Select if there is only one instance of the
* granule allocator (i.e., gran_initialize will be called only once.
* In this case, (1) there are a few optimizations that can can be done
* and (2) the GRAN_HANDLE is not needed.
* CONFIG_DEBUG_GRAN - Just like CONFIG_DEBUG_MM, but only generates ouput
* from the gran allocation logic.
*/
/****************************************************************************
* Public Types
****************************************************************************/
#ifndef CONFIG_GRAN_SINGLE
typedef FAR void *GRAN_HANDLE;
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/****************************************************************************
* Name: gran_initialize
*
* Description:
* Set up one granule allocator instance. Allocations will be aligned to
* the granule size; allocations will be in units of the granule size.
* Larger granules will give better performance and less overhead but more
* losses of memory due to alignment and quantization waste.
*
* NOTE: The current implementation also restricts the maximum allocation
* size to 32 granaules. That restriction could be eliminated with some
* additional coding effort.
*
* Input Parameters:
* heapstart - Start of the granule allocation heap
* heapsize - Size of heap in bytes
* log2gran - Log base 2 of the size of one granule. 0->1 byte,
* 1->2 bytes, 2->4 bytes, 3-> 8bytes, etc.
*
* Returned Value:
* On success, a non-NULL handle is returned that may be used with other
* granual allocator interfaces.
*
****************************************************************************/
#ifdef CONFIG_GRAN_SINGLE
EXTERN int gran_initialize(FAR void *heapstart, size_t heapsize,
uint8_t log2gran);
#else
EXTERN GRAN_HANDLE gran_initialize(FAR void *heapstart, size_t heapsize,
uint8_t log2gran);
#endif
/****************************************************************************
* Name: gran_alloc
*
* Description:
* Allocate memory from the granule heap.
*
* NOTE: The current implementation also restricts the maximum allocation
* size to 32 granaules. That restriction could be eliminated with some
* additional coding effort.
*
* Input Parameters:
* handle - The handle previously returned by gran_initialize
* size - The size of the memory region to allocate.
*
* Returned Value:
* On success, either a non-NULL pointer to the allocated memory (if
* CONFIG_GRAN_SINGLE) or zero (if !CONFIG_GRAN_SINGLE) is returned.
*
****************************************************************************/
#ifdef CONFIG_GRAN_SINGLE
EXTERN FAR void *gran_alloc(size_t size);
#else
EXTERN FAR void *gran_alloc(GRAN_HANDLE handle, size_t size);
#endif
/****************************************************************************
* Name: gran_free
*
* Description:
* Return memory to the granule heap.
*
* Input Parameters:
* handle - The handle previously returned by gran_initialize
* memory - A pointer to memory previoiusly allocated by gran_alloc.
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_GRAN_SINGLE
EXTERN void gran_free(FAR void *memory, size_t size);
#else
EXTERN void gran_free(GRAN_HANDLE handle, FAR void *memory, size_t size);
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* CONFIG_GRAN */
#endif /* __INCLUDE_NUTTX_GRAN_H */
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