minix/lib/liblwip/dist/src/include/lwip/priv/memp_priv.h

   1 /**
   2  * @file
   3  * memory pools lwIP internal implementations (do not use in application code)
   4  */
   5
   6 /*
   7  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without modification,
  11  * are permitted provided that the following conditions are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright notice,
  14  *    this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright notice,
  16  *    this list of conditions and the following disclaimer in the documentation
  17  *    and/or other materials provided with the distribution.
  18  * 3. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  24  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  29  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  30  * OF SUCH DAMAGE.
  31  *
  32  * This file is part of the lwIP TCP/IP stack.
  33  *
  34  * Author: Adam Dunkels <adam@sics.se>
  35  *
  36  */
  37
  38 #ifndef LWIP_HDR_MEMP_PRIV_H
  39 #define LWIP_HDR_MEMP_PRIV_H
  40
  41 #include "lwip/opt.h"
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 #include "lwip/mem.h"
  48
  49 #if MEMP_OVERFLOW_CHECK
  50 /* if MEMP_OVERFLOW_CHECK is turned on, we reserve some bytes at the beginning
  51  * and at the end of each element, initialize them as 0xcd and check
  52  * them later. */
  53 /* If MEMP_OVERFLOW_CHECK is >= 2, on every call to memp_malloc or memp_free,
  54  * every single element in each pool is checked!
  55  * This is VERY SLOW but also very helpful. */
  56 /* MEMP_SANITY_REGION_BEFORE and MEMP_SANITY_REGION_AFTER can be overridden in
  57  * lwipopts.h to change the amount reserved for checking. */
  58 #ifndef MEMP_SANITY_REGION_BEFORE
  59 #define MEMP_SANITY_REGION_BEFORE  16
  60 #endif /* MEMP_SANITY_REGION_BEFORE*/
  61 #if MEMP_SANITY_REGION_BEFORE > 0
  62 #define MEMP_SANITY_REGION_BEFORE_ALIGNED    LWIP_MEM_ALIGN_SIZE(MEMP_SANITY_REGION_BEFORE)
  63 #else
  64 #define MEMP_SANITY_REGION_BEFORE_ALIGNED    0
  65 #endif /* MEMP_SANITY_REGION_BEFORE*/
  66 #ifndef MEMP_SANITY_REGION_AFTER
  67 #define MEMP_SANITY_REGION_AFTER   16
  68 #endif /* MEMP_SANITY_REGION_AFTER*/
  69 #if MEMP_SANITY_REGION_AFTER > 0
  70 #define MEMP_SANITY_REGION_AFTER_ALIGNED     LWIP_MEM_ALIGN_SIZE(MEMP_SANITY_REGION_AFTER)
  71 #else
  72 #define MEMP_SANITY_REGION_AFTER_ALIGNED     0
  73 #endif /* MEMP_SANITY_REGION_AFTER*/
  74
  75 /* MEMP_SIZE: save space for struct memp and for sanity check */
  76 #define MEMP_SIZE          (LWIP_MEM_ALIGN_SIZE(sizeof(struct memp)) + MEMP_SANITY_REGION_BEFORE_ALIGNED)
  77 #define MEMP_ALIGN_SIZE(x) (LWIP_MEM_ALIGN_SIZE(x) + MEMP_SANITY_REGION_AFTER_ALIGNED)
  78
  79 #else /* MEMP_OVERFLOW_CHECK */
  80
  81 /* No sanity checks
  82  * We don't need to preserve the struct memp while not allocated, so we
  83  * can save a little space and set MEMP_SIZE to 0.
  84  */
  85 #define MEMP_SIZE           0
  86 #define MEMP_ALIGN_SIZE(x) (LWIP_MEM_ALIGN_SIZE(x))
  87
  88 #endif /* MEMP_OVERFLOW_CHECK */
  89
  90 #if !MEMP_MEM_MALLOC || MEMP_OVERFLOW_CHECK
  91 struct memp {
  92   struct memp *next;
  93 #if MEMP_OVERFLOW_CHECK
  94   const char *file;
  95   int line;
  96 #endif /* MEMP_OVERFLOW_CHECK */
  97 };
  98 #endif /* !MEMP_MEM_MALLOC || MEMP_OVERFLOW_CHECK */
  99
 100 #if MEM_USE_POOLS && MEMP_USE_CUSTOM_POOLS
 101 /* Use a helper type to get the start and end of the user "memory pools" for mem_malloc */
 102 typedef enum {
 103     /* Get the first (via:
 104        MEMP_POOL_HELPER_START = ((u8_t) 1*MEMP_POOL_A + 0*MEMP_POOL_B + 0*MEMP_POOL_C + 0)*/
 105     MEMP_POOL_HELPER_FIRST = ((u8_t)
 106 #define LWIP_MEMPOOL(name,num,size,desc)
 107 #define LWIP_MALLOC_MEMPOOL_START 1
 108 #define LWIP_MALLOC_MEMPOOL(num, size) * MEMP_POOL_##size + 0
 109 #define LWIP_MALLOC_MEMPOOL_END
 110 #include "lwip/priv/memp_std.h"
 111     ) ,
 112     /* Get the last (via:
 113        MEMP_POOL_HELPER_END = ((u8_t) 0 + MEMP_POOL_A*0 + MEMP_POOL_B*0 + MEMP_POOL_C*1) */
 114     MEMP_POOL_HELPER_LAST = ((u8_t)
 115 #define LWIP_MEMPOOL(name,num,size,desc)
 116 #define LWIP_MALLOC_MEMPOOL_START
 117 #define LWIP_MALLOC_MEMPOOL(num, size) 0 + MEMP_POOL_##size *
 118 #define LWIP_MALLOC_MEMPOOL_END 1
 119 #include "lwip/priv/memp_std.h"
 120     )
 121 } memp_pool_helper_t;
 122
 123 /* The actual start and stop values are here (cast them over)
 124    We use this helper type and these defines so we can avoid using const memp_t values */
 125 #define MEMP_POOL_FIRST ((memp_t) MEMP_POOL_HELPER_FIRST)
 126 #define MEMP_POOL_LAST   ((memp_t) MEMP_POOL_HELPER_LAST)
 127 #endif /* MEM_USE_POOLS && MEMP_USE_CUSTOM_POOLS */
 128
 129 /** Memory pool descriptor */
 130 struct memp_desc {
 131 #if defined(LWIP_DEBUG) || MEMP_OVERFLOW_CHECK || LWIP_STATS_DISPLAY
 132   /** Textual description */
 133   const char *desc;
 134 #endif /* LWIP_DEBUG || MEMP_OVERFLOW_CHECK || LWIP_STATS_DISPLAY */
 135 #if MEMP_STATS
 136   /** Statistics */
 137   struct stats_mem *stats;
 138 #endif
 139
 140   /** Element size */
 141   u16_t size;
 142
 143 #if !MEMP_MEM_MALLOC
 144   /** Number of elements */
 145   u16_t num;
 146
 147   /** Base address */
 148   u8_t *base;
 149
 150   /** First free element of each pool. Elements form a linked list. */
 151   struct memp **tab;
 152 #endif /* MEMP_MEM_MALLOC */
 153 };
 154
 155 #if defined(LWIP_DEBUG) || MEMP_OVERFLOW_CHECK || LWIP_STATS_DISPLAY
 156 #define DECLARE_LWIP_MEMPOOL_DESC(desc) (desc),
 157 #else
 158 #define DECLARE_LWIP_MEMPOOL_DESC(desc)
 159 #endif
 160
 161 #if MEMP_STATS
 162 #define LWIP_MEMPOOL_DECLARE_STATS_INSTANCE(name) static struct stats_mem name;
 163 #define LWIP_MEMPOOL_DECLARE_STATS_REFERENCE(name) &name,
 164 #else
 165 #define LWIP_MEMPOOL_DECLARE_STATS_INSTANCE(name)
 166 #define LWIP_MEMPOOL_DECLARE_STATS_REFERENCE(name)
 167 #endif
 168
 169 void memp_init_pool(const struct memp_desc *desc);
 170
 171 #if MEMP_OVERFLOW_CHECK
 172 void *memp_malloc_pool_fn(const struct memp_desc* desc, const char* file, const int line);
 173 #define memp_malloc_pool(d) memp_malloc_pool_fn((d), __FILE__, __LINE__)
 174 #else
 175 void *memp_malloc_pool(const struct memp_desc *desc);
 176 #endif
 177 void  memp_free_pool(const struct memp_desc* desc, void *mem);
 178
 179 #ifdef __cplusplus
 180 }
 181 #endif
 182
 183 #endif /* LWIP_HDR_MEMP_PRIV_H */