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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS 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 3 of the License, or
(at your option) any later version.
ChibiOS 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, see <http://www.gnu.org/licenses/>.
*/
/**
* @file chheap.h
* @brief Heaps macros and structures.
*
* @addtogroup heaps
* @{
*/
#ifndef CHHEAP_H
#define CHHEAP_H
#if !defined(CH_CFG_USE_HEAP)
#define CH_CFG_USE_HEAP FALSE
#endif
#if (CH_CFG_USE_HEAP == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
/**
* @brief Minimum alignment used for heap.
* @note Cannot use the sizeof operator in this macro.
*/
#if (SIZEOF_PTR == 4) || defined(__DOXYGEN__)
#define CH_HEAP_ALIGNMENT 8U
#elif (SIZEOF_PTR == 2)
#define CH_HEAP_ALIGNMENT 4U
#else
#error "unsupported pointer size"
#endif
/*===========================================================================*/
/* Module pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if CH_CFG_USE_MEMCORE == FALSE
#error "CH_CFG_USE_HEAP requires CH_CFG_USE_MEMCORE"
#endif
#if (CH_CFG_USE_MUTEXES == FALSE) && (CH_CFG_USE_SEMAPHORES == FALSE)
#error "CH_CFG_USE_HEAP requires CH_CFG_USE_MUTEXES and/or CH_CFG_USE_SEMAPHORES"
#endif
/*===========================================================================*/
/* Module data structures and types. */
/*===========================================================================*/
/**
* @brief Type of a memory heap.
*/
typedef struct memory_heap memory_heap_t;
/**
* @brief Type of a memory heap header.
*/
typedef union heap_header heap_header_t;
/**
* @brief Memory heap block header.
*/
union heap_header {
stkalign_t align;
struct {
heap_header_t *next; /**< @brief Next block in free list. */
size_t pages; /**< @brief Size of the area in pages. */
} free;
struct {
memory_heap_t *heap; /**< @brief Block owner heap. */
size_t size; /**< @brief Size of the area in bytes. */
} used;
};
/**
* @brief Structure describing a memory heap.
*/
struct memory_heap {
memgetfunc2_t provider; /**< @brief Memory blocks provider for
this heap. */
heap_header_t header; /**< @brief Free blocks list header. */
#if CH_CFG_USE_MUTEXES == TRUE
mutex_t mtx; /**< @brief Heap access mutex. */
#else
semaphore_t sem; /**< @brief Heap access semaphore. */
#endif
};
/*===========================================================================*/
/* Module macros. */
/*===========================================================================*/
/**
* @brief Allocation of an aligned static heap buffer.
*/
#define CH_HEAP_AREA(name, size) \
ALIGNED_VAR(CH_HEAP_ALIGNMENT) \
uint8_t name[MEM_ALIGN_NEXT((size), CH_HEAP_ALIGNMENT)]
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void _heap_init(void);
void chHeapObjectInit(memory_heap_t *heapp, void *buf, size_t size);
void *chHeapAllocAligned(memory_heap_t *heapp, size_t size, unsigned align);
void chHeapFree(void *p);
size_t chHeapStatus(memory_heap_t *heapp, size_t *totalp, size_t *largestp);
#ifdef __cplusplus
}
#endif
/*===========================================================================*/
/* Module inline functions. */
/*===========================================================================*/
/**
* @brief Allocates a block of memory from the heap by using the first-fit
* algorithm.
* @details The allocated block is guaranteed to be properly aligned for a
* pointer data type.
*
* @param[in] heapp pointer to a heap descriptor or @p NULL in order to
* access the default heap.
* @param[in] size the size of the block to be allocated. Note that the
* allocated block may be a bit bigger than the requested
* size for alignment and fragmentation reasons.
* @return A pointer to the allocated block.
* @retval NULL if the block cannot be allocated.
*
* @api
*/
static inline void *chHeapAlloc(memory_heap_t *heapp, size_t size) {
return chHeapAllocAligned(heapp, size, CH_HEAP_ALIGNMENT);
}
/**
* @brief Returns the size of an allocated block.
* @note The returned value is the requested size, the real size is the
* same value aligned to the next @p CH_HEAP_ALIGNMENT multiple.
*
* @param[in] p pointer to the memory block
* @return Size of the block.
*
* @api
*/
static inline size_t chHeapGetSize(const void *p) {
return ((heap_header_t *)p - 1U)->used.size;
}
#endif /* CH_CFG_USE_HEAP == TRUE */
#endif /* CHHEAP_H */
/** @} */
|
