URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP/] [core/] [mem.c] - Blame information for rev 867

Go to most recent revision | Details | Compare with Previous | View Log


/** @file
 *
 * Dynamic memory manager
 *
 */
 
/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 */
 
#include <string.h>
 
#include "lwip/arch.h"
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/mem.h"
 
#include "lwip/sys.h"
 
#include "lwip/stats.h"
 
#if (MEM_LIBC_MALLOC == 0)
/* lwIP replacement for your libc malloc() */
 
struct mem {
  mem_size_t next, prev;
#if MEM_ALIGNMENT == 1
  u8_t used;
#elif MEM_ALIGNMENT == 2
  u16_t used;
#elif MEM_ALIGNMENT == 4
  u32_t used;
#elif MEM_ALIGNMENT == 8
  u64_t used;
#else
#error "unhandled MEM_ALIGNMENT size"
#endif /* MEM_ALIGNMENT */
};
 
static struct mem *ram_end;
#if 1
/* Adam original */
static u8_t ram[MEM_SIZE + sizeof(struct mem) + MEM_ALIGNMENT];
#else
/* Christiaan alignment fix */
static u8_t *ram;
static struct mem ram_heap[1 + ( (MEM_SIZE + sizeof(struct mem) - 1) / sizeof(struct mem))];
#endif
 
#define MIN_SIZE 12
#if 0 /* this one does not align correctly for some, resulting in crashes */
#define SIZEOF_STRUCT_MEM (unsigned int)MEM_ALIGN_SIZE(sizeof(struct mem))
#else
#define SIZEOF_STRUCT_MEM (sizeof(struct mem) + \
                          (((sizeof(struct mem) % MEM_ALIGNMENT) == 0)? 0 : \
                          (4 - (sizeof(struct mem) % MEM_ALIGNMENT))))
#endif
 
static struct mem *lfree;   /* pointer to the lowest free block */
 
static sys_sem_t mem_sem;
 
static void
plug_holes(struct mem *mem)
{
  struct mem *nmem;
  struct mem *pmem;
 
  LWIP_ASSERT("plug_holes: mem >= ram", (u8_t *)mem >= ram);
  LWIP_ASSERT("plug_holes: mem < ram_end", (u8_t *)mem < (u8_t *)ram_end);
  LWIP_ASSERT("plug_holes: mem->used == 0", mem->used == 0);
 
  /* plug hole forward */
  LWIP_ASSERT("plug_holes: mem->next <= MEM_SIZE", mem->next <= MEM_SIZE);
 
  nmem = (struct mem *)&ram[mem->next];
  if (mem != nmem && nmem->used == 0 && (u8_t *)nmem != (u8_t *)ram_end) {
    if (lfree == nmem) {
      lfree = mem;
    }
    mem->next = nmem->next;
    ((struct mem *)&ram[nmem->next])->prev = (u8_t *)mem - ram;
  }
 
  /* plug hole backward */
  pmem = (struct mem *)&ram[mem->prev];
  if (pmem != mem && pmem->used == 0) {
    if (lfree == mem) {
      lfree = pmem;
    }
    pmem->next = mem->next;
    ((struct mem *)&ram[mem->next])->prev = (u8_t *)pmem - ram;
  }
}
 
void
mem_init(void)
{
  struct mem *mem;
 
#if 1
  /* Adam original */
#else
  /* Christiaan alignment fix */
  ram = (u8_t*)ram_heap;
#endif
  memset(ram, 0, MEM_SIZE);
  mem = (struct mem *)ram;
  mem->next = MEM_SIZE;
  mem->prev = 0;
  mem->used = 0;
  ram_end = (struct mem *)&ram[MEM_SIZE];
  ram_end->used = 1;
  ram_end->next = MEM_SIZE;
  ram_end->prev = MEM_SIZE;
 
  mem_sem = sys_sem_new(1);
 
  lfree = (struct mem *)ram;
 
#if MEM_STATS
  lwip_stats.mem.avail = MEM_SIZE;
#endif /* MEM_STATS */
}
 
void
mem_free(void *rmem)
{
  struct mem *mem;
 
  if (rmem == NULL) {
    LWIP_DEBUGF(MEM_DEBUG | DBG_TRACE | 2, ("mem_free(p == NULL) was called.\n"));
    return;
  }
 
  sys_sem_wait(mem_sem);
 
  LWIP_ASSERT("mem_free: legal memory", (u8_t *)rmem >= (u8_t *)ram &&
    (u8_t *)rmem < (u8_t *)ram_end);
 
  if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) {
    LWIP_DEBUGF(MEM_DEBUG | 3, ("mem_free: illegal memory\n"));
#if MEM_STATS
    ++lwip_stats.mem.err;
#endif /* MEM_STATS */
    sys_sem_signal(mem_sem);
    return;
  }
  mem = (struct mem *)((u8_t *)rmem - SIZEOF_STRUCT_MEM);
 
  LWIP_ASSERT("mem_free: mem->used", mem->used);
 
  mem->used = 0;
 
  if (mem < lfree) {
    lfree = mem;
  }
 
#if MEM_STATS
  lwip_stats.mem.used -= mem->next - ((u8_t *)mem - ram);
 
#endif /* MEM_STATS */
  plug_holes(mem);
  sys_sem_signal(mem_sem);
}
 
void *
mem_realloc(void *rmem, mem_size_t newsize)
{
  mem_size_t size;
  mem_size_t ptr, ptr2;
  struct mem *mem, *mem2;
 
  /* Expand the size of the allocated memory region so that we can
     adjust for alignment. */
  if ((newsize % MEM_ALIGNMENT) != 0) {
   newsize += MEM_ALIGNMENT - ((newsize + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT);
  }
 
  if (newsize > MEM_SIZE) {
    return NULL;
  }
 
  sys_sem_wait(mem_sem);
 
  LWIP_ASSERT("mem_realloc: legal memory", (u8_t *)rmem >= (u8_t *)ram &&
   (u8_t *)rmem < (u8_t *)ram_end);
 
  if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) {
    LWIP_DEBUGF(MEM_DEBUG | 3, ("mem_realloc: illegal memory\n"));
    return rmem;
  }
  mem = (struct mem *)((u8_t *)rmem - SIZEOF_STRUCT_MEM);
 
  ptr = (u8_t *)mem - ram;
 
  size = mem->next - ptr - SIZEOF_STRUCT_MEM;
#if MEM_STATS
  lwip_stats.mem.used -= (size - newsize);
#endif /* MEM_STATS */
 
  if (newsize + SIZEOF_STRUCT_MEM + MIN_SIZE < size) {
    ptr2 = ptr + SIZEOF_STRUCT_MEM + newsize;
    mem2 = (struct mem *)&ram[ptr2];
    mem2->used = 0;
    mem2->next = mem->next;
    mem2->prev = ptr;
    mem->next = ptr2;
    if (mem2->next != MEM_SIZE) {
      ((struct mem *)&ram[mem2->next])->prev = ptr2;
    }
 
    plug_holes(mem2);
  }
  sys_sem_signal(mem_sem);
  return rmem;
}
 
#if 1
/**
 * Adam's mem_malloc(), suffers from bug #17922
 * Set if to 0 for alternative mem_malloc().
 */
void *
mem_malloc(mem_size_t size)
{
  mem_size_t ptr, ptr2;
  struct mem *mem, *mem2;
 
  if (size == 0) {
    return NULL;
  }
 
  /* Expand the size of the allocated memory region so that we can
     adjust for alignment. */
  if ((size % MEM_ALIGNMENT) != 0) {
    size += MEM_ALIGNMENT - ((size + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT);
  }
 
  if (size > MEM_SIZE) {
    return NULL;
  }
 
  sys_sem_wait(mem_sem);
 
  for (ptr = (u8_t *)lfree - ram; ptr < MEM_SIZE; ptr = ((struct mem *)&ram[ptr])->next) {
    mem = (struct mem *)&ram[ptr];
    if (!mem->used &&
       mem->next - (ptr + SIZEOF_STRUCT_MEM) >= size + SIZEOF_STRUCT_MEM) {
      ptr2 = ptr + SIZEOF_STRUCT_MEM + size;
      mem2 = (struct mem *)&ram[ptr2];
 
      mem2->prev = ptr;
      mem2->next = mem->next;
      mem->next = ptr2;
      if (mem2->next != MEM_SIZE) {
        ((struct mem *)&ram[mem2->next])->prev = ptr2;
      }
 
      mem2->used = 0;
      mem->used = 1;
#if MEM_STATS
      lwip_stats.mem.used += (size + SIZEOF_STRUCT_MEM);
      /*      if (lwip_stats.mem.max < lwip_stats.mem.used) {
        lwip_stats.mem.max = lwip_stats.mem.used;
        } */
      if (lwip_stats.mem.max < ptr2) {
        lwip_stats.mem.max = ptr2;
      }
#endif /* MEM_STATS */
 
      if (mem == lfree) {
        /* Find next free block after mem */
        while (lfree->used && lfree != ram_end) {
          lfree = (struct mem *)&ram[lfree->next];
        }
        LWIP_ASSERT("mem_malloc: !lfree->used", !lfree->used);
      }
      sys_sem_signal(mem_sem);
      LWIP_ASSERT("mem_malloc: allocated memory not above ram_end.",
       (mem_ptr_t)mem + SIZEOF_STRUCT_MEM + size <= (mem_ptr_t)ram_end);
      LWIP_ASSERT("mem_malloc: allocated memory properly aligned.",
       (unsigned long)((u8_t *)mem + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT == 0);
      return (u8_t *)mem + SIZEOF_STRUCT_MEM;
    }
  }
  LWIP_DEBUGF(MEM_DEBUG | 2, ("mem_malloc: could not allocate %"S16_F" bytes\n", (s16_t)size));
#if MEM_STATS
  ++lwip_stats.mem.err;
#endif /* MEM_STATS */
  sys_sem_signal(mem_sem);
  return NULL;
}
#else
/**
 * Adam's mem_malloc() plus solution for bug #17922
 */
void *
mem_malloc(mem_size_t size)
{
  mem_size_t ptr, ptr2;
  struct mem *mem, *mem2;
 
  if (size == 0) {
    return NULL;
  }
 
  /* Expand the size of the allocated memory region so that we can
     adjust for alignment. */
  if ((size % MEM_ALIGNMENT) != 0) {
    size += MEM_ALIGNMENT - ((size + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT);
  }
 
  if (size > MEM_SIZE) {
    return NULL;
  }
 
  sys_sem_wait(mem_sem);
 
  for (ptr = (u8_t *)lfree - ram; ptr < MEM_SIZE - size; ptr = ((struct mem *)&ram[ptr])->next) {
    mem = (struct mem *)&ram[ptr];
 
    if (!mem->used) {
 
      ptr2 = ptr + SIZEOF_STRUCT_MEM + size;
 
      if (mem->next - (ptr + (2*SIZEOF_STRUCT_MEM)) >= size) {
        /* split large block, create empty remainder */
        mem->next = ptr2;
        mem->used = 1;
        /* create mem2 struct */
        mem2 = (struct mem *)&ram[ptr2];
        mem2->used = 0;
        mem2->next = mem->next;
        mem2->prev = ptr;
 
        if (mem2->next != MEM_SIZE) {
          ((struct mem *)&ram[mem2->next])->prev = ptr2;
        }
      }
      else if (mem->next - (ptr + SIZEOF_STRUCT_MEM) > size) {
        /* near fit, no split, no mem2 creation,
           round up to mem->next */
        ptr2 = mem->next;
        mem->used = 1;
      }
      else if (mem->next - (ptr + SIZEOF_STRUCT_MEM) == size) {
        /* exact fit, do not split, no mem2 creation */
        mem->next = ptr2;
        mem->used = 1;
      }
 
      if (mem->used) {
#if MEM_STATS
        lwip_stats.mem.used += (size + SIZEOF_STRUCT_MEM);
        if (lwip_stats.mem.max < ptr2) {
          lwip_stats.mem.max = ptr2;
        }
#endif /* MEM_STATS */
        if (mem == lfree) {
          /* Find next free block after mem */
          while (lfree->used && lfree != ram_end) {
            lfree = (struct mem *)&ram[lfree->next];
          }
          LWIP_ASSERT("mem_malloc: !lfree->used", !lfree->used);
        }
        sys_sem_signal(mem_sem);
        LWIP_ASSERT("mem_malloc: allocated memory not above ram_end.",
         (mem_ptr_t)mem + SIZEOF_STRUCT_MEM + size <= (mem_ptr_t)ram_end);
        LWIP_ASSERT("mem_malloc: allocated memory properly aligned.",
         (unsigned long)((u8_t *)mem + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT == 0);
        return (u8_t *)mem + SIZEOF_STRUCT_MEM;
      }
    }
  }
  LWIP_DEBUGF(MEM_DEBUG | 2, ("mem_malloc: could not allocate %"S16_F" bytes\n", (s16_t)size));
#if MEM_STATS
  ++lwip_stats.mem.err;
#endif /* MEM_STATS */
  sys_sem_signal(mem_sem);
  return NULL;
}
#endif
 
#endif /* MEM_LIBC_MALLOC == 0 */
 

Browse

Tools

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP/] [core/] [mem.c] - Blame information for rev 867

Line No.	Rev	Author	Line
1	606	jeremybenn	`/** @file`
2			`*`
3			`* Dynamic memory manager`
4			`*`
5			`*/`
6
7			`/*`
8			`* Copyright (c) 2001-2004 Swedish Institute of Computer Science.`
9			`* All rights reserved.`
10			`*`
11			`* Redistribution and use in source and binary forms, with or without modification,`
12			`* are permitted provided that the following conditions are met:`
13			`*`
14			`* 1. Redistributions of source code must retain the above copyright notice,`
15			`* this list of conditions and the following disclaimer.`
16			`* 2. Redistributions in binary form must reproduce the above copyright notice,`
17			`* this list of conditions and the following disclaimer in the documentation`
18			`* and/or other materials provided with the distribution.`
19			`* 3. The name of the author may not be used to endorse or promote products`
20			`* derived from this software without specific prior written permission.`
21			`*`
22			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23			`* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF`
24			`* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT`
25			`* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,`
26			`* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT`
27			`* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS`
28			`* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN`
29			`* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING`
30			`* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY`
31			`* OF SUCH DAMAGE.`
32			`*`
33			`* This file is part of the lwIP TCP/IP stack.`
34			`*`
35			`* Author: Adam Dunkels <adam@sics.se>`
36			`*`
37			`*/`
38
39			`#include <string.h>`
40
41			`#include "lwip/arch.h"`
42			`#include "lwip/opt.h"`
43			`#include "lwip/def.h"`
44			`#include "lwip/mem.h"`
45
46			`#include "lwip/sys.h"`
47
48			`#include "lwip/stats.h"`
49
50			`#if (MEM_LIBC_MALLOC == 0)`
51			`/* lwIP replacement for your libc malloc() */`
52
53			`struct mem {`
54			`mem_size_t next, prev;`
55			`#if MEM_ALIGNMENT == 1`
56			`u8_t used;`
57			`#elif MEM_ALIGNMENT == 2`
58			`u16_t used;`
59			`#elif MEM_ALIGNMENT == 4`
60			`u32_t used;`
61			`#elif MEM_ALIGNMENT == 8`
62			`u64_t used;`
63			`#else`
64			`#error "unhandled MEM_ALIGNMENT size"`
65			`#endif /* MEM_ALIGNMENT */`
66			`};`
67
68			`static struct mem *ram_end;`
69			`#if 1`
70			`/* Adam original */`
71			`static u8_t ram[MEM_SIZE + sizeof(struct mem) + MEM_ALIGNMENT];`
72			`#else`
73			`/* Christiaan alignment fix */`
74			`static u8_t *ram;`
75			`static struct mem ram_heap[1 + ( (MEM_SIZE + sizeof(struct mem) - 1) / sizeof(struct mem))];`
76			`#endif`
77
78			`#define MIN_SIZE 12`
79			`#if 0 /* this one does not align correctly for some, resulting in crashes */`
80			`#define SIZEOF_STRUCT_MEM (unsigned int)MEM_ALIGN_SIZE(sizeof(struct mem))`
81			`#else`
82			`#define SIZEOF_STRUCT_MEM (sizeof(struct mem) + \`
83			`(((sizeof(struct mem) % MEM_ALIGNMENT) == 0)? 0 : \`
84			`(4 - (sizeof(struct mem) % MEM_ALIGNMENT))))`
85			`#endif`
86
87			`static struct mem lfree; / pointer to the lowest free block */`
88
89			`static sys_sem_t mem_sem;`
90
91			`static void`
92			`plug_holes(struct mem *mem)`
93			`{`
94			`struct mem *nmem;`
95			`struct mem *pmem;`
96
97			`LWIP_ASSERT("plug_holes: mem >= ram", (u8_t *)mem >= ram);`
98			`LWIP_ASSERT("plug_holes: mem < ram_end", (u8_t )mem < (u8_t )ram_end);`
99			`LWIP_ASSERT("plug_holes: mem->used == 0", mem->used == 0);`
100
101			`/* plug hole forward */`
102			`LWIP_ASSERT("plug_holes: mem->next <= MEM_SIZE", mem->next <= MEM_SIZE);`
103
104			`nmem = (struct mem *)&ram[mem->next];`
105			`if (mem != nmem && nmem->used == 0 && (u8_t )nmem != (u8_t )ram_end) {`
106			`if (lfree == nmem) {`
107			`lfree = mem;`
108			`}`
109			`mem->next = nmem->next;`
110			`((struct mem )&ram[nmem->next])->prev = (u8_t )mem - ram;`
111			`}`
112
113			`/* plug hole backward */`
114			`pmem = (struct mem *)&ram[mem->prev];`
115			`if (pmem != mem && pmem->used == 0) {`
116			`if (lfree == mem) {`
117			`lfree = pmem;`
118			`}`
119			`pmem->next = mem->next;`
120			`((struct mem )&ram[mem->next])->prev = (u8_t )pmem - ram;`
121			`}`
122			`}`
123
124			`void`
125			`mem_init(void)`
126			`{`
127			`struct mem *mem;`
128
129			`#if 1`
130			`/* Adam original */`
131			`#else`
132			`/* Christiaan alignment fix */`
133			`ram = (u8_t*)ram_heap;`
134			`#endif`
135			`memset(ram, 0, MEM_SIZE);`
136			`mem = (struct mem *)ram;`
137			`mem->next = MEM_SIZE;`
138			`mem->prev = 0;`
139			`mem->used = 0;`
140			`ram_end = (struct mem *)&ram[MEM_SIZE];`
141			`ram_end->used = 1;`
142			`ram_end->next = MEM_SIZE;`
143			`ram_end->prev = MEM_SIZE;`
144
145			`mem_sem = sys_sem_new(1);`
146
147			`lfree = (struct mem *)ram;`
148
149			`#if MEM_STATS`
150			`lwip_stats.mem.avail = MEM_SIZE;`
151			`#endif /* MEM_STATS */`
152			`}`
153
154			`void`
155			`mem_free(void *rmem)`
156			`{`
157			`struct mem *mem;`
158
159			`if (rmem == NULL) {`
160			`LWIP_DEBUGF(MEM_DEBUG \| DBG_TRACE \| 2, ("mem_free(p == NULL) was called.\n"));`
161			`return;`
162			`}`
163
164			`sys_sem_wait(mem_sem);`
165
166			`LWIP_ASSERT("mem_free: legal memory", (u8_t )rmem >= (u8_t )ram &&`
167			`(u8_t )rmem < (u8_t )ram_end);`
168
169			`if ((u8_t )rmem < (u8_t )ram \|\| (u8_t )rmem >= (u8_t )ram_end) {`
170			`LWIP_DEBUGF(MEM_DEBUG \| 3, ("mem_free: illegal memory\n"));`
171			`#if MEM_STATS`
172			`++lwip_stats.mem.err;`
173			`#endif /* MEM_STATS */`
174			`sys_sem_signal(mem_sem);`
175			`return;`
176			`}`
177			`mem = (struct mem )((u8_t )rmem - SIZEOF_STRUCT_MEM);`
178
179			`LWIP_ASSERT("mem_free: mem->used", mem->used);`
180
181			`mem->used = 0;`
182
183			`if (mem < lfree) {`
184			`lfree = mem;`
185			`}`
186
187			`#if MEM_STATS`
188			`lwip_stats.mem.used -= mem->next - ((u8_t *)mem - ram);`
189
190			`#endif /* MEM_STATS */`
191			`plug_holes(mem);`
192			`sys_sem_signal(mem_sem);`
193			`}`
194
195			`void *`
196			`mem_realloc(void *rmem, mem_size_t newsize)`
197			`{`
198			`mem_size_t size;`
199			`mem_size_t ptr, ptr2;`
200			`struct mem mem, mem2;`
201
202			`/* Expand the size of the allocated memory region so that we can`
203			`adjust for alignment. */`
204			`if ((newsize % MEM_ALIGNMENT) != 0) {`
205			`newsize += MEM_ALIGNMENT - ((newsize + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT);`
206			`}`
207
208			`if (newsize > MEM_SIZE) {`
209			`return NULL;`
210			`}`
211
212			`sys_sem_wait(mem_sem);`
213
214			`LWIP_ASSERT("mem_realloc: legal memory", (u8_t )rmem >= (u8_t )ram &&`
215			`(u8_t )rmem < (u8_t )ram_end);`
216
217			`if ((u8_t )rmem < (u8_t )ram \|\| (u8_t )rmem >= (u8_t )ram_end) {`
218			`LWIP_DEBUGF(MEM_DEBUG \| 3, ("mem_realloc: illegal memory\n"));`
219			`return rmem;`
220			`}`
221			`mem = (struct mem )((u8_t )rmem - SIZEOF_STRUCT_MEM);`
222
223			`ptr = (u8_t *)mem - ram;`
224
225			`size = mem->next - ptr - SIZEOF_STRUCT_MEM;`
226			`#if MEM_STATS`
227			`lwip_stats.mem.used -= (size - newsize);`
228			`#endif /* MEM_STATS */`
229
230			`if (newsize + SIZEOF_STRUCT_MEM + MIN_SIZE < size) {`
231			`ptr2 = ptr + SIZEOF_STRUCT_MEM + newsize;`
232			`mem2 = (struct mem *)&ram[ptr2];`
233			`mem2->used = 0;`
234			`mem2->next = mem->next;`
235			`mem2->prev = ptr;`
236			`mem->next = ptr2;`
237			`if (mem2->next != MEM_SIZE) {`
238			`((struct mem *)&ram[mem2->next])->prev = ptr2;`
239			`}`
240
241			`plug_holes(mem2);`
242			`}`
243			`sys_sem_signal(mem_sem);`
244			`return rmem;`
245			`}`
246
247			`#if 1`
248			`/**`
249			`* Adam's mem_malloc(), suffers from bug #17922`
250			`* Set if to 0 for alternative mem_malloc().`
251			`*/`
252			`void *`
253			`mem_malloc(mem_size_t size)`
254			`{`
255			`mem_size_t ptr, ptr2;`
256			`struct mem mem, mem2;`
257
258			`if (size == 0) {`
259			`return NULL;`
260			`}`
261
262			`/* Expand the size of the allocated memory region so that we can`
263			`adjust for alignment. */`
264			`if ((size % MEM_ALIGNMENT) != 0) {`
265			`size += MEM_ALIGNMENT - ((size + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT);`
266			`}`
267
268			`if (size > MEM_SIZE) {`
269			`return NULL;`
270			`}`
271
272			`sys_sem_wait(mem_sem);`
273
274			`for (ptr = (u8_t )lfree - ram; ptr < MEM_SIZE; ptr = ((struct mem )&ram[ptr])->next) {`
275			`mem = (struct mem *)&ram[ptr];`
276			`if (!mem->used &&`
277			`mem->next - (ptr + SIZEOF_STRUCT_MEM) >= size + SIZEOF_STRUCT_MEM) {`
278			`ptr2 = ptr + SIZEOF_STRUCT_MEM + size;`
279			`mem2 = (struct mem *)&ram[ptr2];`
280
281			`mem2->prev = ptr;`
282			`mem2->next = mem->next;`
283			`mem->next = ptr2;`
284			`if (mem2->next != MEM_SIZE) {`
285			`((struct mem *)&ram[mem2->next])->prev = ptr2;`
286			`}`
287
288			`mem2->used = 0;`
289			`mem->used = 1;`
290			`#if MEM_STATS`
291			`lwip_stats.mem.used += (size + SIZEOF_STRUCT_MEM);`
292			`/* if (lwip_stats.mem.max < lwip_stats.mem.used) {`
293			`lwip_stats.mem.max = lwip_stats.mem.used;`
294			`} */`
295			`if (lwip_stats.mem.max < ptr2) {`
296			`lwip_stats.mem.max = ptr2;`
297			`}`
298			`#endif /* MEM_STATS */`
299
300			`if (mem == lfree) {`
301			`/* Find next free block after mem */`
302			`while (lfree->used && lfree != ram_end) {`
303			`lfree = (struct mem *)&ram[lfree->next];`
304			`}`
305			`LWIP_ASSERT("mem_malloc: !lfree->used", !lfree->used);`
306			`}`
307			`sys_sem_signal(mem_sem);`
308			`LWIP_ASSERT("mem_malloc: allocated memory not above ram_end.",`
309			`(mem_ptr_t)mem + SIZEOF_STRUCT_MEM + size <= (mem_ptr_t)ram_end);`
310			`LWIP_ASSERT("mem_malloc: allocated memory properly aligned.",`
311			`(unsigned long)((u8_t *)mem + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT == 0);`
312			`return (u8_t *)mem + SIZEOF_STRUCT_MEM;`
313			`}`
314			`}`
315			`LWIP_DEBUGF(MEM_DEBUG \| 2, ("mem_malloc: could not allocate %"S16_F" bytes\n", (s16_t)size));`
316			`#if MEM_STATS`
317			`++lwip_stats.mem.err;`
318			`#endif /* MEM_STATS */`
319			`sys_sem_signal(mem_sem);`
320			`return NULL;`
321			`}`
322			`#else`
323			`/**`
324			`* Adam's mem_malloc() plus solution for bug #17922`
325			`*/`
326			`void *`
327			`mem_malloc(mem_size_t size)`
328			`{`
329			`mem_size_t ptr, ptr2;`
330			`struct mem mem, mem2;`
331
332			`if (size == 0) {`
333			`return NULL;`
334			`}`
335
336			`/* Expand the size of the allocated memory region so that we can`
337			`adjust for alignment. */`
338			`if ((size % MEM_ALIGNMENT) != 0) {`
339			`size += MEM_ALIGNMENT - ((size + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT);`
340			`}`
341
342			`if (size > MEM_SIZE) {`
343			`return NULL;`
344			`}`
345
346			`sys_sem_wait(mem_sem);`
347
348			`for (ptr = (u8_t )lfree - ram; ptr < MEM_SIZE - size; ptr = ((struct mem )&ram[ptr])->next) {`
349			`mem = (struct mem *)&ram[ptr];`
350
351			`if (!mem->used) {`
352
353			`ptr2 = ptr + SIZEOF_STRUCT_MEM + size;`
354
355			`if (mem->next - (ptr + (2*SIZEOF_STRUCT_MEM)) >= size) {`
356			`/* split large block, create empty remainder */`
357			`mem->next = ptr2;`
358			`mem->used = 1;`
359			`/* create mem2 struct */`
360			`mem2 = (struct mem *)&ram[ptr2];`
361			`mem2->used = 0;`
362			`mem2->next = mem->next;`
363			`mem2->prev = ptr;`
364
365			`if (mem2->next != MEM_SIZE) {`
366			`((struct mem *)&ram[mem2->next])->prev = ptr2;`
367			`}`
368			`}`
369			`else if (mem->next - (ptr + SIZEOF_STRUCT_MEM) > size) {`
370			`/* near fit, no split, no mem2 creation,`
371			`round up to mem->next */`
372			`ptr2 = mem->next;`
373			`mem->used = 1;`
374			`}`
375			`else if (mem->next - (ptr + SIZEOF_STRUCT_MEM) == size) {`
376			`/* exact fit, do not split, no mem2 creation */`
377			`mem->next = ptr2;`
378			`mem->used = 1;`
379			`}`
380
381			`if (mem->used) {`
382			`#if MEM_STATS`
383			`lwip_stats.mem.used += (size + SIZEOF_STRUCT_MEM);`
384			`if (lwip_stats.mem.max < ptr2) {`
385			`lwip_stats.mem.max = ptr2;`
386			`}`
387			`#endif /* MEM_STATS */`
388			`if (mem == lfree) {`
389			`/* Find next free block after mem */`
390			`while (lfree->used && lfree != ram_end) {`
391			`lfree = (struct mem *)&ram[lfree->next];`
392			`}`
393			`LWIP_ASSERT("mem_malloc: !lfree->used", !lfree->used);`
394			`}`
395			`sys_sem_signal(mem_sem);`
396			`LWIP_ASSERT("mem_malloc: allocated memory not above ram_end.",`
397			`(mem_ptr_t)mem + SIZEOF_STRUCT_MEM + size <= (mem_ptr_t)ram_end);`
398			`LWIP_ASSERT("mem_malloc: allocated memory properly aligned.",`
399			`(unsigned long)((u8_t *)mem + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT == 0);`
400			`return (u8_t *)mem + SIZEOF_STRUCT_MEM;`
401			`}`
402			`}`
403			`}`
404			`LWIP_DEBUGF(MEM_DEBUG \| 2, ("mem_malloc: could not allocate %"S16_F" bytes\n", (s16_t)size));`
405			`#if MEM_STATS`
406			`++lwip_stats.mem.err;`
407			`#endif /* MEM_STATS */`
408			`sys_sem_signal(mem_sem);`
409			`return NULL;`
410			`}`
411			`#endif`
412
413			`#endif /* MEM_LIBC_MALLOC == 0 */`
414