From: Eric W. Biederman <ebiederm@xmission.com>
Restore an ioapic to virtual wire mode on reboot if it has an ExtInt input.
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/arch/i386/kernel/io_apic.c | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+)
diff -puN arch/i386/kernel/io_apic.c~kexec-ioapic-virtwire-on-shutdowni386 arch/i386/kernel/io_apic.c
--- 25/arch/i386/kernel/io_apic.c~kexec-ioapic-virtwire-on-shutdowni386 2004-10-03 16:42:58.723525608 -0700
+++ 25-akpm/arch/i386/kernel/io_apic.c 2004-10-03 16:42:58.728524848 -0700
@@ -1622,11 +1622,42 @@ static void __init enable_IO_APIC(void)
*/
void disable_IO_APIC(void)
{
+ int pin;
/*
* Clear the IO-APIC before rebooting:
*/
clear_IO_APIC();
+ /*
+ * If the i82559 is routed through an IOAPIC
+ * Put that IOAPIC in virtual wire mode
+ * so legacy interrups can be delivered.
+ */
+ pin = find_isa_irq_pin(0, mp_ExtINT);
+ if (pin != -1) {
+ struct IO_APIC_route_entry entry;
+ unsigned long flags;
+
+ memset(&entry, 0, sizeof(entry));
+ entry.mask = 0; /* Enabled */
+ entry.trigger = 0; /* Edge */
+ entry.irr = 0;
+ entry.polarity = 0; /* High */
+ entry.delivery_status = 0;
+ entry.dest_mode = 0; /* Physical */
+ entry.delivery_mode = 7; /* ExtInt */
+ entry.vector = 0;
+ entry.dest.physical.physical_dest = 0;
+
+
+ /*
+ * Add it to the IO-APIC irq-routing table:
+ */
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
+ io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ }
disconnect_bsp_APIC();
}
_