1 | /*
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2 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without modification,
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6 | * are permitted provided that the following conditions are met:
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7 | *
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8 | * 1. Redistributions of source code must retain the above copyright notice,
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9 | * this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 | * this list of conditions and the following disclaimer in the documentation
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12 | * and/or other materials provided with the distribution.
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13 | * 3. The name of the author may not be used to endorse or promote products
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14 | * derived from this software without specific prior written permission.
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15 | *
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16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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25 | * OF SUCH DAMAGE.
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26 | *
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27 | * This file is part of the lwIP TCP/IP stack.
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28 | *
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29 | * Author: Adam Dunkels <adam@sics.se>
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30 | *
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31 | */
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32 | #ifndef __LWIP_MEM_H__
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33 | #define __LWIP_MEM_H__
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34 |
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35 | #include "lwip/opt.h"
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36 |
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37 | #ifdef __cplusplus
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38 | extern "C" {
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39 | #endif
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40 |
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41 | #if MEM_LIBC_MALLOC
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42 |
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43 | #include <stddef.h> /* for size_t */
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44 |
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45 | typedef size_t mem_size_t;
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46 | #define MEM_SIZE_F SZT_F
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47 |
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48 | /* aliases for C library malloc() */
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49 | #define mem_init()
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50 | /* in case C library malloc() needs extra protection,
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51 | * allow these defines to be overridden.
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52 | */
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53 | #ifndef mem_free
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54 | #define mem_free free
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55 | #endif
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56 | #ifndef mem_malloc
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57 | #define mem_malloc malloc
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58 | #endif
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59 | #ifndef mem_calloc
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60 | #define mem_calloc calloc
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61 | #endif
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62 | /* Since there is no C library allocation function to shrink memory without
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63 | moving it, define this to nothing. */
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64 | #ifndef mem_trim
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65 | #define mem_trim(mem, size) (mem)
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66 | #endif
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67 | #else /* MEM_LIBC_MALLOC */
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68 |
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69 | /* MEM_SIZE would have to be aligned, but using 64000 here instead of
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70 | * 65535 leaves some room for alignment...
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71 | */
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72 | #if MEM_SIZE > 64000L
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73 | typedef u32_t mem_size_t;
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74 | #define MEM_SIZE_F U32_F
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75 | #else
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76 | typedef u16_t mem_size_t;
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77 | #define MEM_SIZE_F U16_F
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78 | #endif /* MEM_SIZE > 64000 */
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79 |
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80 | #if MEM_USE_POOLS
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81 | /** mem_init is not used when using pools instead of a heap */
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82 | #define mem_init()
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83 | /** mem_trim is not used when using pools instead of a heap:
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84 | we can't free part of a pool element and don't want to copy the rest */
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85 | #define mem_trim(mem, size) (mem)
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86 | #else /* MEM_USE_POOLS */
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87 | /* lwIP alternative malloc */
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88 | void mem_init(void);
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89 | void *mem_trim(void *mem, mem_size_t size);
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90 | #endif /* MEM_USE_POOLS */
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91 | void *mem_malloc(mem_size_t size);
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92 | void *mem_calloc(mem_size_t count, mem_size_t size);
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93 | void mem_free(void *mem);
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94 | #endif /* MEM_LIBC_MALLOC */
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95 |
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96 | /** Calculate memory size for an aligned buffer - returns the next highest
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97 | * multiple of MEM_ALIGNMENT (e.g. LWIP_MEM_ALIGN_SIZE(3) and
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98 | * LWIP_MEM_ALIGN_SIZE(4) will both yield 4 for MEM_ALIGNMENT == 4).
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99 | */
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100 | #ifndef LWIP_MEM_ALIGN_SIZE
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101 | #define LWIP_MEM_ALIGN_SIZE(size) (((size) + MEM_ALIGNMENT - 1) & ~(MEM_ALIGNMENT-1))
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102 | #endif
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103 |
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104 | /** Calculate safe memory size for an aligned buffer when using an unaligned
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105 | * type as storage. This includes a safety-margin on (MEM_ALIGNMENT - 1) at the
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106 | * start (e.g. if buffer is u8_t[] and actual data will be u32_t*)
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107 | */
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108 | #ifndef LWIP_MEM_ALIGN_BUFFER
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109 | #define LWIP_MEM_ALIGN_BUFFER(size) (((size) + MEM_ALIGNMENT - 1))
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110 | #endif
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111 |
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112 | /** Align a memory pointer to the alignment defined by MEM_ALIGNMENT
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113 | * so that ADDR % MEM_ALIGNMENT == 0
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114 | */
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115 | #ifndef LWIP_MEM_ALIGN
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116 | #define LWIP_MEM_ALIGN(addr) ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1)))
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117 | #endif
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118 |
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119 | #ifdef __cplusplus
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120 | }
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121 | #endif
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122 |
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123 | #endif /* __LWIP_MEM_H__ */
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