diff options
Diffstat (limited to 'kexec_test/x86-setup-legacy-pic.S')
| -rw-r--r-- | kexec_test/x86-setup-legacy-pic.S | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/kexec_test/x86-setup-legacy-pic.S b/kexec_test/x86-setup-legacy-pic.S new file mode 100644 index 0000000..32ef42f --- /dev/null +++ b/kexec_test/x86-setup-legacy-pic.S @@ -0,0 +1,53 @@ +/* + * 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 |