1 /* 2 * Copyright (C) 2007 Michael Brown <mbrown (at) 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 */ 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
