PATCH: use mach io_ports definitions in io_apic

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Allows for the non standard cascade

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux-2.5.67/arch/i386/kernel/io_apic.c linux-2.5.67-ac1/arch/i386/kernel/io_apic.c
--- linux-2.5.67/arch/i386/kernel/io_apic.c 2003-04-08 00:37:34.000000000 +0100
+++ linux-2.5.67-ac1/arch/i386/kernel/io_apic.c 2003-04-08 00:40:21.000000000 +0100
@@ -38,6 +38,8 @@
 
 #include <mach_apic.h>
 
+#include "io_ports.h"
+
 #undef APIC_LOCKUP_DEBUG
 
 #define APIC_LOCKUP_DEBUG
@@ -2135,7 +2137,7 @@
  * Additionally, something is definitely wrong with irq9
  * on PIIX4 boards.
  */
-#define PIC_IRQS (1<<2)
+#define PIC_IRQS (1 << PIC_CASCADE_IR)
 
 void __init setup_IO_APIC(void)
 {
-
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