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
|
/* boot.c: BOOTSTRAP ALLOCATOR
*
* $Id$
* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
*
* .overview: A structure and protocols for allocating memory from a
* given block. Very simple, it basically just increments a pointer.
*
* .boot.c: The Bootstrap Allocator is used to allocate C structures
* for use in the implementation, not client objects. Therefore,
* we use "C types" (void *, size_t) not "client types" (Addr, Size).
*/
#include "boot.h"
#include "mpm.h"
SRCID(boot, "$Id$");
#define BootBlockSig ((Sig)0x519B002B) /* SIGnature BOOT Block */
/* BootBlockCheck -- check a BootBlock structure */
Bool BootBlockCheck(BootBlock boot)
{
CHECKS(BootBlock, boot);
CHECKL(boot->base != NULL);
CHECKL(boot->alloc != NULL);
CHECKL(boot->limit != NULL);
CHECKL(boot->base <= boot->alloc);
CHECKL(boot->alloc <= boot->limit);
CHECKL(boot->alloc < boot->limit);
return TRUE;
}
/* BootBlockInit -- initialize a BootBlock
*
* boot: a pointer to the structure to be initialized
* (must have been allocated by the caller, probably on the stack).
* base: a pointer to the base of the memory to be allocated from
* from (the memory need not be committed)
* limit: a pointer to the limit of the memory to be allocated from
*/
Res BootBlockInit(BootBlockStruct *boot, void *base, void *limit)
{
/* Can't check boot as we are supposed to be initializing it */
AVER(boot != NULL);
AVER(base != NULL);
AVER(limit != NULL);
AVER(base < limit);
boot->base = base;
boot->alloc = base;
boot->limit = limit;
boot->sig = BootBlockSig;
AVERT(BootBlock, boot);
return ResOK;
}
/* BootBlockFinish -- finish a BootBlock structure */
void BootBlockFinish(BootBlock boot)
{
AVERT(BootBlock, boot);
boot->base = boot->alloc = boot->limit = NULL;
boot->sig = SigInvalid;
}
/* BootAllocated
*
* Returns the total amount allocated using this descriptor
*/
size_t BootAllocated(BootBlock boot)
{
AVERT(BootBlock, boot);
return PointerOffset(boot->base, boot->alloc);
}
/* BootAlloc -- allocate from BootBlock structure
*
* preturn: The returned pointer, see .boot.c.
* boot: must have been initialized with BootBlockInit().
* size: size of requested object, see .boot.c.
* align: required alignment of object, see .boot.c.
*/
Res BootAlloc(void **pReturn, BootBlock boot, size_t size, size_t align)
{
void *blockBase, *blockLimit; /* base, limit of candidate block */
AVER(pReturn != NULL);
AVERT(BootBlock, boot);
AVER(size > 0);
AVER(AlignCheck((Align)align));
/* Align alloc pointer up and bounds check. */
blockBase = PointerAlignUp(boot->alloc, align);
if(boot->limit <= blockBase || blockBase < boot->alloc) {
return ResMEMORY;
}
blockLimit = PointerAdd(blockBase, size);
/* Following checks that the ordering constraint holds: */
/* boot->alloc <= blockBase < blockLimit <= boot->limit */
/* (if it doesn't hold then something overallocated/wrapped round) */
if(blockBase < boot->alloc ||
blockLimit <= blockBase ||
boot->limit < blockLimit) {
return ResMEMORY;
}
/* Fits! So allocate it */
boot->alloc = blockLimit;
*pReturn = blockBase;
return ResOK;
}
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
* All rights reserved. This is an open source license. Contact
* Ravenbrook for commercial licensing options.
*
* 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. Redistributions in any form must be accompanied by information on how
* to obtain complete source code for this software and any accompanying
* software that uses this software. The source code must either be
* included in the distribution or be available for no more than the cost
* of distribution plus a nominal fee, and must be freely redistributable
* under reasonable conditions. For an executable file, complete source
* code means the source code for all modules it contains. It does not
* include source code for modules or files that typically accompany the
* major components of the operating system on which the executable file
* runs.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS AND CONTRIBUTORS 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.
*/
|
