2 * This file is part of the coreboot project.
4 * Copyright (C) 2012 The Chromium OS Authors. All rights reserved.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; version 2 of
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
25 #include <arch/ebda.h>
27 void setup_ebda(u32 low_memory_size, u16 ebda_segment, u16 ebda_size)
29 if (!low_memory_size || !ebda_segment || !ebda_size)
32 /* clear BIOS DATA AREA */
33 memset((void *)X86_BDA_BASE, 0, X86_BDA_SIZE);
35 write16(X86_EBDA_LOWMEM, (low_memory_size >> 10));
36 write16(X86_EBDA_SEGMENT, ebda_segment);
39 memset((void *)(ebda_segment << 4), 0, ebda_size);
40 write16((ebda_segment << 4), (ebda_size >> 10));
43 void setup_default_ebda(void)
45 setup_ebda(DEFAULT_EBDA_LOWMEM,