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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 The Chromium OS Authors. All rights reserved.
*
* 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; version 2 of
* the License.
*
* 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.
*/
#include <stdint.h>
#include <string.h>
#include <arch/io.h>
#include <arch/ebda.h>
#include <arch/acpi.h>
void setup_ebda(u32 low_memory_size, u16 ebda_segment, u16 ebda_size)
{
u16 low_memory_kb;
u16 ebda_kb;
void *ebda;
/* Skip in S3 resume path */
if (acpi_is_wakeup_s3())
return;
if (!low_memory_size || !ebda_segment || !ebda_size)
return;
low_memory_kb = low_memory_size >> 10;
ebda_kb = ebda_size >> 10;
ebda = (void *)((uintptr_t)ebda_segment << 4);
/* clear BIOS DATA AREA */
memset(X86_BDA_BASE, 0, X86_BDA_SIZE);
/* Avoid unaligned write16() since it's undefined behavior */
memcpy(X86_EBDA_LOWMEM, &low_memory_kb, sizeof(low_memory_kb));
memcpy(X86_EBDA_SEGMENT, &ebda_segment, sizeof(ebda_segment));
/* Set up EBDA */
memset(ebda, 0, ebda_size);
memcpy(ebda, &ebda_kb, sizeof(ebda_kb));
}
void setup_default_ebda(void)
{
setup_ebda(DEFAULT_EBDA_LOWMEM,
DEFAULT_EBDA_SEGMENT,
DEFAULT_EBDA_SIZE);
}
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