1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 *	Copyright (c) 1994, by Sun Microsytems, Inc.
24 */
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI"
27
28/*
29 * Includes
30 */
31
32#include "prb_internals.h"
33
34
35/*
36 * Globals
37 *	Memory that prex uses to store combinations in target process
38 */
39
40#define	INITMEMSZ 2048
41
42static char	initial_memory[INITMEMSZ];
43static tnf_memseg_t	initial_memseg = {
44					initial_memory,
45					initial_memory + INITMEMSZ,
46					DEFAULTMUTEX,
47					0
48				};
49
50tnf_memseg_t *	__tnf_probe_memseg_p = &initial_memseg;
51
52
53/*
54 * __tnf_probe_alloc() - allocates memory from the global pool
55 */
56
57char *
58__tnf_probe_alloc(size_t size)
59{
60	tnf_memseg_t *	memseg_p = __tnf_probe_memseg_p;
61	char *		ptr;
62
63	ptr = NULL;
64
65	mutex_lock(&memseg_p->i_lock);
66
67	memseg_p->i_reqsz = size;
68
69	if ((memseg_p->min_p + size) <= memseg_p->max_p) {
70	    ptr = memseg_p->min_p;
71	    memseg_p->min_p += size;
72	}
73
74	memseg_p->i_reqsz = 0;
75
76	mutex_unlock(&memseg_p->i_lock);
77
78	return (ptr);
79
80}   /* end __tnf_probe_alloc */
81