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/*
* kexec: Linux boots Linux
*
* Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com)
*
* 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.
*
* 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 <sys/io.h>
#include <purgatory.h>
#include "purgatory-x86.h"
void x86_setup_legacy_pic(void)
{
/* Load the legacy dos settings into the 8259A pic */
outb(0xff, 0x21); /* mask all of 8259A-1 */
outb(0xff, 0xa1); /* mask all of 8259A-2 */
outb(0x11, 0x20); /* ICW1: select 8259A-1 init */
outb(0x11, 0x80); /* A short delay */
outb(0x08, 0x21); /* ICW2: 8259A-1 IR0-7 mappend to 0x8-0xf */
outb(0x08, 0x80); /* A short delay */
outb(0x01, 0x21); /* Normal 8086 auto EOI mode */
outb(0x01, 0x80); /* A short delay */
outb(0x11, 0xa0); /* ICW1: select 8259A-2 init */
outb(0x11, 0x80); /* A short delay */
outb(0x70, 0xa1); /* ICW2: 8259A-2 IR0-7 mappend to 0x70-0x77 */
outb(0x70, 0x80); /* A short delay */
outb(0x01, 0xa1); /* Normal 8086 auto EOI mode */
outb(0x01, 0x80); /* A short delay */
outb(0x00, 0x21); /* Unmask all of 8259A-1 */
outb(0x00, 0xa1); /* Unmask all of 8259A-2 */
}
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