1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/*
* malloc.h - dynamic memory allocation header
*
* written by Vangelis Rokas, 2004 (vrokas@otenet.gr)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* In other words, you are welcome to use, share and improve this program.
* You are forbidden to forbid anyone else to use, share and improve
* what you give them. Help stamp out software-hoarding!
*
* $Id: malloc.h 3714 2005-04-02 13:13:53Z vrokas $
*/
/*
* Structure of memory block header:
* bit 7 (MSB): allocated flag
* bits 0-6: pointer to next block (max length: 126)
*
*/
#ifndef __MALLOC_H__
#define __MALLOC_H__
/* set EMULATION to 1 to enable native Linux malloc emulation layer. This is
* for debugging purposes only */
#ifndef EMULATION
#define EMULATION 0
#endif
#if EMULATION
//#define malloc pic16_malloc
//#define free pic16_free
//#define realloc pic16_realloc
//#define calloc pic16_calloc
//#define lmalloc pic16_lmalloc
//#define lfree pic16_lfree
//#define lrealloc pic16_lrealloc
//#define lcalloc pic16_lcalloc
#define _MALLOC_SPEC
#else
#pragma library c
#define _MALLOC_SPEC __data
#endif
/* when MALLOC_MAX_FIRST is 1, the memory allocator tries to find a block
* that fits the requested size without merging (initially), if this block
* is not found, then tries to merge adjacent blocks. If MALLOC_MAX_FIRST is
* set 0, then the allocator tries to merge adjacent blocks in the first
* place. Both behaviours may give better results when used in certain
* circumstancs. I.e. if realloc is to be used, leaving some space after the
* block, will allow realloc to allocate it, otherwise it may result in much
* more memory fragmentation. An algorithm can be implemented to allow small
* fragments to be allocated but this is much too complicated for the PIC18F's
* architecture */
#define MALLOC_MAX_FIRST 0
#define MAX_BLOCK_SIZE 0x7f /* 127 bytes */
#define MAX_HEAP_SIZE 0x200 /* 512 bytes */
#define _MAX_HEAP_SIZE (MAX_HEAP_SIZE-1)
#define ALLOC_FLAG 0x80
#define HEADER_SIZE 1
/* memory block header, max size 127 bytes, 126 usable */
typedef union {
unsigned char datum;
struct {
unsigned count: 7;
unsigned alloc: 1;
} bits;
} _malloc_rec;
/* initialize heap, should be called before any call to malloc/realloc/calloc */
void _initHeap(unsigned char _MALLOC_SPEC *dHeap, unsigned int heapsize);
/* start searching for a block of size at least bSize, merge adjacent blocks
* if necessery */
_malloc_rec _MALLOC_SPEC *_mergeHeapBlock(_malloc_rec _MALLOC_SPEC *sBlock, unsigned char bSize);
/* allocate a memory block */
unsigned char _MALLOC_SPEC *malloc(unsigned char len);
/* same as malloc, but clear memory */
unsigned char _MALLOC_SPEC *calloc(unsigned char len);
/* expand or reduce a memory block, if mblock is NULL, then same as malloc */
unsigned char _MALLOC_SPEC *realloc(unsigned char _MALLOC_SPEC *mblock, unsigned char len);
/* free a memory block */
void free(unsigned char _MALLOC_SPEC *);
/* returns the size of all the unallocated memory */
unsigned int memfree(void);
/* return the size of the maximum unallocated memory block */
unsigned int memfreemax(void);
#endif /* __MALLOC_H__ */
|
