diff options
Diffstat (limited to 'gpxe/src/arch/i386/firmware/pcbios/basemem.c')
-rw-r--r-- | gpxe/src/arch/i386/firmware/pcbios/basemem.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/gpxe/src/arch/i386/firmware/pcbios/basemem.c b/gpxe/src/arch/i386/firmware/pcbios/basemem.c new file mode 100644 index 00000000..b126d2a7 --- /dev/null +++ b/gpxe/src/arch/i386/firmware/pcbios/basemem.c @@ -0,0 +1,44 @@ +/* + * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <stdint.h> +#include <realmode.h> +#include <bios.h> +#include <basemem.h> +#include <gpxe/hidemem.h> + +/** @file + * + * Base memory allocation + * + */ + +/** + * Set the BIOS free base memory counter + * + * @v new_fbms New free base memory counter (in kB) + */ +void set_fbms ( unsigned int new_fbms ) { + uint16_t fbms = new_fbms; + + /* Update the BIOS memory counter */ + put_real ( fbms, BDA_SEG, BDA_FBMS ); + + /* Update our hidden memory region map */ + hide_basemem(); +} |