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EthernetNetIf/LPC1768/lwip/include/lwip/mem.h@0:58c3d014a4e7, 2011-09-06 (annotated)

Committer:
slowness
Date:
Tue Sep 06 18:05:46 2011 +0000
Revision:
0:58c3d014a4e7

        

        
Who changed what in which revision?

        

            
                
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/*





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 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.





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 * All rights reserved. 





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 * 





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 * Redistribution and use in source and binary forms, with or without modification, 





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 * are permitted provided that the following conditions are met:





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 *





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 * 1. Redistributions of source code must retain the above copyright notice,





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 *    this list of conditions and the following disclaimer.





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 * 2. Redistributions in binary form must reproduce the above copyright notice,





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 *    this list of conditions and the following disclaimer in the documentation





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 *    and/or other materials provided with the distribution.





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 * 3. The name of the author may not be used to endorse or promote products





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 *    derived from this software without specific prior written permission. 





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 *





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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 





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 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 





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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 





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 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 





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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 





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 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 





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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 





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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 





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 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 





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 * OF SUCH DAMAGE.





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 *





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 * This file is part of the lwIP TCP/IP stack.





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 * 





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 * Author: Adam Dunkels <adam@sics.se>





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 *





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 */





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#ifndef __LWIP_MEM_H__





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#define __LWIP_MEM_H__





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#include "lwip/opt.h"





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#ifdef __cplusplus





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extern "C" {





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#endif





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#if MEM_LIBC_MALLOC





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#include <stddef.h> /* for size_t */





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typedef size_t mem_size_t;





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/* aliases for C library malloc() */





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#define mem_init()





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/* in case C library malloc() needs extra protection,





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 * allow these defines to be overridden.





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 */





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#ifndef mem_free





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#define mem_free free





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#endif





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#ifndef mem_malloc





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#define mem_malloc malloc





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#endif





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#ifndef mem_calloc





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#define mem_calloc calloc





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#endif





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/* Since there is no C library allocation function to shrink memory without





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   moving it, define this to nothing. */





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#ifndef mem_trim





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#define mem_trim(mem, size) (mem)





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#endif





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#else /* MEM_LIBC_MALLOC */





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/* MEM_SIZE would have to be aligned, but using 64000 here instead of





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 * 65535 leaves some room for alignment...





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 */





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#if MEM_SIZE > 64000l





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typedef u32_t mem_size_t;





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#define MEM_SIZE_F U32_F





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#else





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typedef u16_t mem_size_t;





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#define MEM_SIZE_F U16_F





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#endif /* MEM_SIZE > 64000 */





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#if MEM_USE_POOLS





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/** mem_init is not used when using pools instead of a heap */





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#define mem_init()





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/** mem_trim is not used when using pools instead of a heap:





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    we can't free part of a pool element and don't want to copy the rest */





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#define mem_trim(mem, size) (mem)





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#else /* MEM_USE_POOLS */





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/* lwIP alternative malloc */





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void  mem_init(void);





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void *mem_trim(void *mem, mem_size_t size);





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#endif /* MEM_USE_POOLS */





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void *mem_malloc(mem_size_t size);





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void *mem_calloc(mem_size_t count, mem_size_t size);





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void  mem_free(void *mem);





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#endif /* MEM_LIBC_MALLOC */





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/** Calculate memory size for an aligned buffer - returns the next highest





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 * multiple of MEM_ALIGNMENT (e.g. LWIP_MEM_ALIGN_SIZE(3) and





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 * LWIP_MEM_ALIGN_SIZE(4) will both yield 4 for MEM_ALIGNMENT == 4).





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 */





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#ifndef LWIP_MEM_ALIGN_SIZE





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#define LWIP_MEM_ALIGN_SIZE(size) (((size) + MEM_ALIGNMENT - 1) & ~(MEM_ALIGNMENT-1))





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#endif





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/** Calculate safe memory size for an aligned buffer when using an unaligned





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 * type as storage. This includes a safety-margin on (MEM_ALIGNMENT - 1) at the





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 * start (e.g. if buffer is u8_t[] and actual data will be u32_t*)





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 */





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#ifndef LWIP_MEM_ALIGN_BUFFER





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#define LWIP_MEM_ALIGN_BUFFER(size) (((size) + MEM_ALIGNMENT - 1))





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#endif





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/** Align a memory pointer to the alignment defined by MEM_ALIGNMENT





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 * so that ADDR % MEM_ALIGNMENT == 0





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 */





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#ifndef LWIP_MEM_ALIGN





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#define LWIP_MEM_ALIGN(addr) ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1)))





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#endif





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#ifdef __cplusplus





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}





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#endif





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#endif /* __LWIP_MEM_H__ */