patch-2.3.49 linux/arch/alpha/kernel/i8259.c

• Lines: 96
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.48/linux/arch/alpha/kernel/i8259.c
• Orig date: Sun Feb 20 21:12:38 2000

diff -u --recursive --new-file v2.3.48/linux/arch/alpha/kernel/i8259.c linux/arch/alpha/kernel/i8259.c
@@ -1,95 +0,0 @@
-/*
- *      linux/arch/alpha/kernel/i8259.c
- *
- * This is the 'legacy' 8259A Programmable Interrupt Controller,
- * present in the majority of PC/AT boxes.
- *
- * Started hacking from linux-2.3.30pre6/arch/i386/kernel/i8259.c.
- */
-
-#include <linux/init.h>
-#include <linux/cache.h>
-#include <linux/sched.h>
-#include <linux/irq.h>
-#include <linux/interrupt.h>
-
-#include <asm/io.h>
-
-#include "proto.h"
-#include "irq_impl.h"
-
-
-/* Note mask bit is true for DISABLED irqs.  */
-static unsigned int cached_irq_mask = 0xffff;
-
-static inline void
-i8259_update_irq_hw(unsigned int irq, unsigned long mask)
-{
-	int port = 0x21;
-	if (irq & 8) mask >>= 8;
-	if (irq & 8) port = 0xA1;
-	outb(mask, port);
-}
-
-inline void
-i8259a_enable_irq(unsigned int irq)
-{
-	i8259_update_irq_hw(irq, cached_irq_mask &= ~(1 << irq));
-}
-
-inline void
-i8259a_disable_irq(unsigned int irq)
-{
-	i8259_update_irq_hw(irq, cached_irq_mask |= 1 << irq);
-}
-
-void
-i8259a_mask_and_ack_irq(unsigned int irq)
-{
-	i8259a_disable_irq(irq);
-
-	/* Ack the interrupt making it the lowest priority.  */
-	if (irq >= 8) {
-		outb(0xE0 | (irq - 8), 0xa0);   /* ack the slave */
-		irq = 2;
-	}
-	outb(0xE0 | irq, 0x20);			/* ack the master */
-}
-
-unsigned int
-i8259a_startup_irq(unsigned int irq)
-{
-	i8259a_enable_irq(irq);
-	return 0; /* never anything pending */
-}
-
-struct hw_interrupt_type i8259a_irq_type = {
-	typename:	"XT-PIC",
-	startup:	i8259a_startup_irq,
-	shutdown:	i8259a_disable_irq,
-	enable:		i8259a_enable_irq,
-	disable:	i8259a_disable_irq,
-	ack:		i8259a_mask_and_ack_irq,
-	end:		i8259a_enable_irq,
-};
-
-void __init
-init_i8259a_irqs(void)
-{
-	static struct irqaction cascade = {
-		handler:	no_action,
-		name:		"cascade",
-	};
-
-	long i;
-
-	outb(0xff, 0x21);	/* mask all of 8259A-1 */
-	outb(0xff, 0xA1);	/* mask all of 8259A-2 */
-
-	for (i = 0; i < 16; i++) {
-		irq_desc[i].status = IRQ_DISABLED;
-		irq_desc[i].handler = &i8259a_irq_type;
-	}
-
-	setup_irq(2, &cascade);
-}