From eba0cfa6b0bef4f2e73c8630a7efa3944df8b0f8 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 04:56:35 +0200 Subject: Adding upstream version 1:2.0.27. Signed-off-by: Daniel Baumann --- purgatory/arch/i386/pic.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 purgatory/arch/i386/pic.c (limited to 'purgatory/arch/i386/pic.c') diff --git a/purgatory/arch/i386/pic.c b/purgatory/arch/i386/pic.c new file mode 100644 index 0000000..c23c459 --- /dev/null +++ b/purgatory/arch/i386/pic.c @@ -0,0 +1,51 @@ +/* + * 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 +#include +#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 */ +} + -- cgit v1.2.3