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/*
* Internal Interrupt Vectors
*
* This takes care of interrupts that are generated by the CPU
* internally, such as the ITC and IPI interrupts.
*
* Copyright (C) 1999 VA Linux Systems
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/irq.h>
#include <asm/processor.h>
#include <asm/ptrace.h>
/*
* This is identical to IOSAPIC handle_irq. It may go away . . .
*/
static int
internal_handle_irq (unsigned int irq, struct pt_regs *regs)
{
struct irqaction *action = 0;
struct irq_desc *id = irq_desc + irq;
unsigned int status;
int retval;
spin_lock(&irq_controller_lock);
{
status = id->status;
if ((status & IRQ_ENABLED) != 0)
action = id->action;
id->status = status & ~(IRQ_REPLAY | IRQ_WAITING);
}
spin_unlock(&irq_controller_lock);
if (!action) {
if (!(id->status & IRQ_AUTODETECT))
printk("irq_hpsim_handle_irq: unexpected interrupt %u\n", irq);
return 0;
}
retval = invoke_irq_handlers(irq, regs, action);
spin_lock(&irq_controller_lock);
{
status = (id->status & ~IRQ_INPROGRESS);
id->status = status;
}
spin_unlock(&irq_controller_lock);
return retval;
}
static void
internal_noop (unsigned int irq)
{
/* nuthing to do... */
}
struct hw_interrupt_type irq_type_ia64_internal = {
"IA64-internal",
(void (*)(unsigned long)) internal_noop, /* init */
internal_noop, /* startup */
internal_noop, /* shutdown */
internal_handle_irq, /* handle */
internal_noop, /* enable */
internal_noop /* disable */
};
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