From: ebiederm@xmission.com (Eric W. Biederman)
To: Greg KH <greg@kroah.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: [PATCH] i8259 shutdown method for i386
Date: 20 Aug 2004 02:43:06 -0600 [thread overview]
Message-ID: <m1y8ka6vz9.fsf@ebiederm.dsl.xmission.com> (raw)
Greg,
Now that you have added sys_device support to the generic
device support. This patch to shutdown the i8259A interrupt
controller on reboot should now be safe.
Eric
diff -uNr linux-2.6.8.1/arch/i386/kernel/i8259.c linux-2.6.8.1-i8259-shutdown.i386/arch/i386/kernel/i8259.c
--- linux-2.6.8.1/arch/i386/kernel/i8259.c Wed Aug 18 14:54:26 2004
+++ linux-2.6.8.1-i8259-shutdown.i386/arch/i386/kernel/i8259.c Wed Aug 18 14:58:56 2004
@@ -244,9 +244,21 @@
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"),
.resume = i8259A_resume,
+ .shutdown = i8259A_shutdown,
};
static struct sys_device device_i8259A = {
next reply other threads:[~2004-08-20 8:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-20 8:43 Eric W. Biederman [this message]
2004-08-24 23:16 ` Greg KH
2004-08-24 23:39 ` Jeff Garzik
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