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/****************************************************************************
* mm/mm_gran.h
*
* Copyright (C) 2012 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 __MM_MM_GRAN_H
#define __MM_MM_GRAN_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <semaphore.h>
#include <nuttx/gran.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Sizes of things */
#define SIZEOF_GAT(n) \
((n + 31) >> 5)
#define SIZEOF_GRAN_S(n) \
(sizeof(struct gran_s) + sizeof(uint32_t) * (SIZEOF_GAT(n) - 1))
/* Debug */
#ifdef CONFIG_CPP_HAVE_VARARGS
# ifdef CONFIG_DEBUG_GRAM
# define gramdbg(format, arg...) dbg(format, ##arg)
# define gramvdbg(format, arg...) vdbg(format, ##arg)
# else
# define gramdbg(format, arg...) mdbg(format, ##arg)
# define gramvdbg(format, arg...) mvdbg(format, ##arg)
# endif
#else
# ifdef CONFIG_DEBUG_GRAM
# define gramdbg dbg
# define gramvdbg vdbg
# else
# define gramdbg (void)
# define gramvdbg (void)
# endif
#endif
/****************************************************************************
* Public Types
****************************************************************************/
/* This structure represents the state of on granual allocation */
struct gran_s
{
uint8_t log2gran; /* Log base 2 of the size of one granule */
uint16_t ngranules; /* The total number of (aligned) granules in the heap */
sem_t exclsem; /* For exclusive access to the GAT */
uintptr_t heapstart; /* The aligned start of the granule heap */
uint32_t gat[1]; /* Start of the granule allocation table */
};
/****************************************************************************
* Public Data
****************************************************************************/
/* State of the single GRAN allocator */
#ifdef CONFIG_GRAN_SINGLE
extern FAR struct gran_s *g_graninfo;
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: gran_semtake and gran_semgive
*
* Description:
* Managed semaphore for the granule allocator. gran_semgive is
* implemented as a macro.
*
* Input Parameters:
* priv - Pointer to the gran state
*
* Returned Value:
* None
*
****************************************************************************/
void gran_semtake(FAR struct gran_s *priv);
#define gran_semgive(p) sem_post(&(p)->exclsem);
#endif /* __MM_MM_GRAN_H */
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