From: Eric W. Biederman <ebiederm@xmission.com>
Date: Sat, 25 Jun 2005 21:57:43 +0000 (-0700)
Subject: [PATCH] kexec: x86_64: add i8259 shutdown method
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=719e711050482be667dafd39ec787859d353931c;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[PATCH] kexec: x86_64: add i8259 shutdown method

From: Eric W. Biederman <ebiederm@xmission.com

The following patch simply adds a shutdown method to the x86_64 i8259 code.

Signed-off-by: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/x86_64/kernel/i8259.c b/arch/x86_64/kernel/i8259.c
index 19eafa0aa95c..a89169095129 100644
--- a/arch/x86_64/kernel/i8259.c
+++ b/arch/x86_64/kernel/i8259.c
@@ -414,10 +414,22 @@ static int i8259A_suspend(struct sys_device *dev, pm_message_t state)
 	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 = {