blob: 469257d5a1277b82d51ea9f4c44f806267ab96ee (
plain)
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
|
/* sbrk.c -- allocate memory dynamically.
*
* Copyright (c) 2002 Red Hat, Inc
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice is included verbatim in any distributions. No written agreement,
* license, or royalty fee is required for any of the authorized uses.
* Modifications to this software may be copyrighted by their authors
* and need not follow the licensing terms described here, provided that
* the new terms are clearly indicated on the first page of each file where
* they apply.
*/
#include <errno.h>
#include "glue.h"
/* just in case, most boards have at least some memory */
#ifndef RAMSIZE
# define RAMSIZE (caddr_t)0x100000
#endif
char *__heap_ptr = (char *)&_end;
/*
* sbrk -- changes heap size size. Get nbytes more
* RAM. We just increment a pointer in what's
* left of memory on the board.
*/
char *
_sbrk (nbytes)
int nbytes;
{
char *base;
char *sp;
base = __heap_ptr;
__heap_ptr += nbytes;
return base;
/* FIXME: We really want to make sure we don't run out of RAM, but this
* isn't very portable.
*/
#if 0
if ((RAMSIZE - heap_ptr - nbytes) >= 0) {
base = heap_ptr;
heap_ptr += nbytes;
return (base);
} else {
errno = ENOMEM;
return ((char *)-1);
}
#endif
}
|
