49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2012 The Chromium OS Authors. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 of
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* the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <string.h>
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#include <arch/io.h>
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#include <arch/ebda.h>
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void setup_ebda(u32 low_memory_size, u16 ebda_segment, u16 ebda_size)
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{
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if (!low_memory_size || !ebda_segment || !ebda_size)
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return;
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/* clear BIOS DATA AREA */
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memset((void *)X86_BDA_BASE, 0, X86_BDA_SIZE);
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write16(X86_EBDA_LOWMEM, (low_memory_size >> 10));
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write16(X86_EBDA_SEGMENT, ebda_segment);
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/* Set up EBDA */
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memset((void *)(ebda_segment << 4), 0, ebda_size);
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write16((ebda_segment << 4), (ebda_size >> 10));
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}
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void setup_default_ebda(void)
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{
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setup_ebda(DEFAULT_EBDA_LOWMEM,
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DEFAULT_EBDA_SEGMENT,
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DEFAULT_EBDA_SIZE);
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}
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