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To: Andrew Morton <akpm@osdl.org>
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Subject: [PATCH 1/14] kexec: i8259-shutdown.i386
From: ebiederm@xmission.com (Eric W. Biederman)
Date: 20 Aug 2004 11:53:36 -0600
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This patch disables interrupt generation from the legacy
pic on reboot.  Now that there is a sys_device class it should
not be called while drivers are still using interrupts.

diff -uNr linux-2.6.8.1-mm2/arch/i386/kernel/i8259.c linux-2.6.8.1-mm2-i8259-shutdown.i386/arch/i386/kernel/i8259.c
--- linux-2.6.8.1-mm2/arch/i386/kernel/i8259.c	Fri Aug 20 09:56:25 2004
+++ linux-2.6.8.1-mm2-i8259-shutdown.i386/arch/i386/kernel/i8259.c	Fri Aug 20 10:27:35 2004
@@ -270,10 +270,22 @@
 	return 0;
 }
 
+static int i8259A_shutdown(struct sys_device *dev)
+{
+	/* Put the i8259A into a quiescent state that
+	 * the kernel initialization code can get it
+	 * out of.
+	 */
+	outb(0xff, 0x21);	/* mask all of 8259A-1 */
+	outb(0xff, 0xA1);	/* mask all of 8259A-1 */
+	return 0;
+}
+
 static struct sysdev_class i8259_sysdev_class = {
 	set_kset_name("i8259"),
 	.suspend = i8259A_suspend,
 	.resume = i8259A_resume,
+	.shutdown = i8259A_shutdown,
 };
 
 static struct sys_device device_i8259A = {