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