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Merge up to 2.6.5

#ifndef _ASM_IA64_HARDIRQ_H
#define _ASM_IA64_HARDIRQ_H

/*
 * Modified 1998-2002, 2004 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 */

#include <linux/config.h>

#include <linux/threads.h>
#include <linux/irq.h>

#include <asm/processor.h>

/*
 * No irq_cpustat_t for IA-64.  The data is held in the per-CPU data structure.
 */

#define __ARCH_IRQ_STAT	1

#define softirq_pending(cpu)		(cpu_data(cpu)->softirq_pending)
#define syscall_count(cpu)		/* unused on IA-64 */
#define ksoftirqd_task(cpu)		(cpu_data(cpu)->ksoftirqd)
#define nmi_count(cpu)			0

#define local_softirq_pending()		(local_cpu_data->softirq_pending)
#define local_syscall_count()		/* unused on IA-64 */
#define local_ksoftirqd_task()		(local_cpu_data->ksoftirqd)
#define local_nmi_count()		0

/*
 * We put the hardirq and softirq counter into the preemption counter. The bitmask has the
 * following meaning:
 *
 * - bits 0-7 are the preemption count (max preemption depth: 256)
 * - bits 8-15 are the softirq count (max # of softirqs: 256)
 * - bits 16-29 are the hardirq count (max # of hardirqs: 16384)
 *
 * - (bit 63 is the PREEMPT_ACTIVE flag---not currently implemented.)
 *
 * PREEMPT_MASK: 0x000000ff
 * SOFTIRQ_MASK: 0x0000ff00
 * HARDIRQ_MASK: 0x3fff0000
 */

#define PREEMPT_BITS	8
#define SOFTIRQ_BITS	8
#define HARDIRQ_BITS	14

#define PREEMPT_SHIFT	0
#define SOFTIRQ_SHIFT	(PREEMPT_SHIFT + PREEMPT_BITS)
#define HARDIRQ_SHIFT	(SOFTIRQ_SHIFT + SOFTIRQ_BITS)

#define __MASK(x)	((1UL << (x))-1)

#define PREEMPT_MASK	(__MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
#define HARDIRQ_MASK	(__MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
#define SOFTIRQ_MASK	(__MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)

#define hardirq_count()	(preempt_count() & HARDIRQ_MASK)
#define softirq_count()	(preempt_count() & SOFTIRQ_MASK)
#define irq_count()	(preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))

#define PREEMPT_OFFSET	(1UL << PREEMPT_SHIFT)
#define SOFTIRQ_OFFSET	(1UL << SOFTIRQ_SHIFT)
#define HARDIRQ_OFFSET	(1UL << HARDIRQ_SHIFT)

/*
 * The hardirq mask has to be large enough to have space for potentially all IRQ sources
 * in the system nesting on a single CPU:
 */
#if (1 << HARDIRQ_BITS) < NR_IRQS
# error HARDIRQ_BITS is too low!
#endif

/*
 * Are we doing bottom half or hardware interrupt processing?
 * Are we in a softirq context?
 * Interrupt context?
 */
#define in_irq()		(hardirq_count())
#define in_softirq()		(softirq_count())
#define in_interrupt()		(irq_count())

#define hardirq_trylock()	(!in_interrupt())
#define hardirq_endlock()	do { } while (0)

#ifdef CONFIG_PREEMPT
# include <linux/smp_lock.h>
# define in_atomic()		((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
# define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
#else
# define in_atomic()		(preempt_count() != 0)
# define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
#endif

#ifdef CONFIG_SMP
  extern void synchronize_irq (unsigned int irq);
#else
# define synchronize_irq(irq)	barrier()
#endif /* CONFIG_SMP */

#endif /* _ASM_IA64_HARDIRQ_H */