* [PATCH] Add sysfs support for the i8259 PIC on x86_64
@ 2004-08-20 8:40 Eric W. Biederman
2004-08-24 23:16 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Eric W. Biederman @ 2004-08-20 8:40 UTC (permalink / raw)
To: Greg KH; +Cc: Andi Kleen, linux-kernel
I got to looking at x86_64 and while it occasionally uses the i8259 legacy
pic it is not put in sysfs.
Here is the appropriate code ported code from i386.
diff -uNr linux-2.6.8.1-i8259-shutdown.i386/arch/x86_64/kernel/i8259.c linux-2.6.8.1-i8259-sysfs.x86_64/arch/x86_64/kernel/i8259.c
--- linux-2.6.8.1-i8259-shutdown.i386/arch/x86_64/kernel/i8259.c Wed Aug 18 14:54:30 2004
+++ linux-2.6.8.1-i8259-sysfs.x86_64/arch/x86_64/kernel/i8259.c Wed Aug 18 14:59:00 2004
@@ -342,6 +342,44 @@
}
}
+static int i8259A_resume(struct sys_device *dev)
+{
+ init_8259A(0);
+ 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 = {
+ .id = 0,
+ .cls = &i8259_sysdev_class,
+};
+
+static int __init i8259A_init_sysfs(void)
+{
+ int error = sysdev_class_register(&i8259_sysdev_class);
+ if (!error)
+ error = sysdev_register(&device_i8259A);
+ return error;
+}
+
+device_initcall(i8259A_init_sysfs);
+
void __init init_8259A(int auto_eoi)
{
unsigned long flags;
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] Add sysfs support for the i8259 PIC on x86_64
2004-08-20 8:40 [PATCH] Add sysfs support for the i8259 PIC on x86_64 Eric W. Biederman
@ 2004-08-24 23:16 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2004-08-24 23:16 UTC (permalink / raw)
To: Eric W. Biederman; +Cc: Andi Kleen, linux-kernel
On Fri, Aug 20, 2004 at 02:40:49AM -0600, Eric W. Biederman wrote:
>
> I got to looking at x86_64 and while it occasionally uses the i8259 legacy
> pic it is not put in sysfs.
>
> Here is the appropriate code ported code from i386.
Hm, this doesn't apply at all. Any chance of redoing it for 2.6.9-rc1?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 2+ messages in thread
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