1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 2007-2009 H. Peter Anvin - All Rights Reserved
4 * Copyright 2009 H. Peter Anvin - All Rights Reserved
5 *
6 * Permission is hereby granted, free of charge, to any person
7 * obtaining a copy of this software and associated documentation
8 * files (the "Software"), to deal in the Software without
9 * restriction, including without limitation the rights to use,
10 * copy, modify, merge, publish, distribute, sublicense, and/or
11 * sell copies of the Software, and to permit persons to whom
12 * the Software is furnished to do so, subject to the following
13 * conditions:
14 *
15 * The above copyright notice and this permission notice shall
16 * be included in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
20 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
22 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * ----------------------------------------------------------------------- */
28
29 /*
30 * memscan.c
31 *
32 * Query the system for free memory
33 */
34
35 #include <syslinux/memscan.h>
36
37 static LIST_HEAD(syslinux_memscan_head);
38
39 /*
40 * Add a memscan entry to the list.
41 */
syslinux_memscan_add(struct syslinux_memscan * entry)42 void syslinux_memscan_add(struct syslinux_memscan *entry)
43 {
44 list_add(&entry->next, &syslinux_memscan_head);
45 }
46
47 /*
48 * Build a new memscan entry and add it to the list.
49 */
syslinux_memscan_new(int func (scan_memory_callback_t,void * data))50 int syslinux_memscan_new(int func(scan_memory_callback_t, void *data))
51 {
52 struct syslinux_memscan *entry;
53
54 entry = malloc(sizeof *entry);
55 if (!entry)
56 return -1;
57
58 entry->func = func;
59 syslinux_memscan_add(entry);
60 return 0;
61 }
62
syslinux_scan_memory(scan_memory_callback_t callback,void * data)63 int syslinux_scan_memory(scan_memory_callback_t callback, void *data)
64 {
65 struct syslinux_memscan *entry;
66 int rv = 0;
67
68 list_for_each_entry(entry, &syslinux_memscan_head, next) {
69 rv = entry->func(callback, data);
70 if (rv)
71 break;
72 }
73
74 return rv;
75 }
76