| /* |
| * 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. |
| */ |
| |
| .text |
| .code32 |
| setup_legacy_pic: |
| /* Load the legacy dos settings into the 8259A pic */ |
| movb $0xff, %al |
| outb %al, $0x21 /* mask all of 8259A-1 */ |
| outb %al, $0xa1 /* mask all of 8259A-1 */ |
| |
| movb $0x11, %al |
| outb %al, $0x20 /* ICW1: select 8259A-1 init */ |
| outb %al, $0x80 /* A short delay */ |
| movb $0x08, %al |
| outb %al, $0x21 /* ICW2: 8259A-1 IR0-7 mappend to 0x8-0xf */ |
| outb %al, $0x80 /* A short delay */ |
| movb $01, %al |
| outb %al, $0x21 /* Normal 8086 auto EOI mode */ |
| outb %al, $0x80 /* A short delay */ |
| |
| |
| movb $0x11, %al |
| outb %al, $0xA0 /* ICW1: select 8259A-2 init */ |
| outb %al, $0x80 /* A short delay */ |
| movb $0x70, %al |
| outb %al, $0xA1 /* ICW2: 8259A-2 IR0-7 mappend to 0x70-0x77 */ |
| outb %al, $0x80 /* A short delay */ |
| movb $01, %al |
| outb %al, $0xA1 /* Normal 8086 auto EOI mode */ |
| outb %al, $0x80 /* A short delay */ |
| |
| movb $0, %al |
| outb %al, $0x21 /* Unmask all of 8259A-1 */ |
| outb %al, $0xa1 /* Unmask all of 8259A-2 */ |
| |
| ret |
