1 /*
2 * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 FILE_LICENCE ( GPL2_OR_LATER );
20
21 #include <stdint.h>
22 #include <realmode.h>
23 #include <bios.h>
24 #include <basemem.h>
25 #include <gpxe/hidemem.h>
26
27 /** @file
28 *
29 * Base memory allocation
30 *
31 */
32
33 /**
34 * Set the BIOS free base memory counter
35 *
36 * @v new_fbms New free base memory counter (in kB)
37 */
set_fbms(unsigned int new_fbms)38 void set_fbms ( unsigned int new_fbms ) {
39 uint16_t fbms = new_fbms;
40
41 /* Update the BIOS memory counter */
42 put_real ( fbms, BDA_SEG, BDA_FBMS );
43
44 /* Update our hidden memory region map */
45 hide_basemem();
46 }
47