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
|
/**
* @file
*
* @brief Malloc Deferred Support
* @ingroup libcsupport
*/
/*
* Process free requests deferred because they were from ISR
* or other critical section.
*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef RTEMS_NEWLIB
#include <stdlib.h>
#include <string.h>
#include "malloc_p.h"
#include <rtems/chain.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/threaddispatch.h>
static RTEMS_CHAIN_DEFINE_EMPTY( _Malloc_GC_list );
RTEMS_INTERRUPT_LOCK_DEFINE( static, _Malloc_GC_lock, "Malloc GC" )
Malloc_System_state _Malloc_System_state( void )
{
System_state_Codes state = _System_state_Get();
if ( _System_state_Is_up( state ) ) {
if ( _Thread_Dispatch_is_enabled() ) {
return MALLOC_SYSTEM_STATE_NORMAL;
} else {
return MALLOC_SYSTEM_STATE_NO_ALLOCATION;
}
} else if ( _System_state_Is_before_multitasking( state ) ) {
return MALLOC_SYSTEM_STATE_NORMAL;
} else {
return MALLOC_SYSTEM_STATE_NO_PROTECTION;
}
}
static void *_Malloc_Get_deferred_free( void )
{
rtems_interrupt_lock_context lock_context;
void *p;
rtems_interrupt_lock_acquire( &_Malloc_GC_lock, &lock_context );
p = rtems_chain_get_unprotected( &_Malloc_GC_list );
rtems_interrupt_lock_release( &_Malloc_GC_lock, &lock_context );
return p;
}
void _Malloc_Process_deferred_frees( void )
{
rtems_chain_node *to_be_freed;
/*
* If some free's have been deferred, then do them now.
*/
while ( ( to_be_freed = _Malloc_Get_deferred_free() ) != NULL ) {
free( to_be_freed );
}
}
void *rtems_heap_allocate_aligned_with_boundary(
size_t size,
uintptr_t alignment,
uintptr_t boundary
)
{
Heap_Control *heap = RTEMS_Malloc_Heap;
void *p;
switch ( _Malloc_System_state() ) {
case MALLOC_SYSTEM_STATE_NORMAL:
_RTEMS_Lock_allocator();
_Malloc_Process_deferred_frees();
p = _Heap_Allocate_aligned_with_boundary(
heap,
size,
alignment,
boundary
);
_RTEMS_Unlock_allocator();
break;
case MALLOC_SYSTEM_STATE_NO_PROTECTION:
p = _Heap_Allocate_aligned_with_boundary(
heap,
size,
alignment,
boundary
);
break;
default:
/*
* Do not attempt to allocate memory if not in correct system state.
*/
return NULL;
}
if ( p == NULL && alignment == 0 && boundary == 0 ) {
p = (*rtems_malloc_extend_handler)( heap, size );
}
/*
* If the user wants us to dirty the allocated memory, then do it.
*/
if ( p != NULL && rtems_malloc_dirty_helper != NULL )
(*rtems_malloc_dirty_helper)( p, size );
return p;
}
void _Malloc_Deferred_free( void *p )
{
rtems_interrupt_lock_context lock_context;
rtems_chain_node *node;
node = (rtems_chain_node *) p;
rtems_interrupt_lock_acquire( &_Malloc_GC_lock, &lock_context );
rtems_chain_initialize_node( node );
rtems_chain_append_unprotected( &_Malloc_GC_list, node );
rtems_interrupt_lock_release( &_Malloc_GC_lock, &lock_context );
}
void *rtems_malloc( size_t size )
{
if ( size == 0 ) {
return NULL;
}
return rtems_heap_allocate_aligned_with_boundary( size, 0, 0 );
}
void *rtems_calloc( size_t nelem, size_t elsize )
{
size_t length;
void *p;
length = nelem * elsize;
p = rtems_malloc( length );
RTEMS_OBFUSCATE_VARIABLE( p );
if ( RTEMS_PREDICT_FALSE( p == NULL ) ) {
return p;
}
return memset( p, 0, length );
}
#endif
|
