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#ifndef LINUX_HARDIRQ_H
#define LINUX_HARDIRQ_H
#include <linux/config.h>
#include <linux/smp_lock.h>
#include <asm/hardirq.h>
/*
* 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)
*
* The hardirq count can be overridden per architecture, the default is:
*
* - bits 16-27 are the hardirq count (max # of hardirqs: 4096)
* - ( bit 28 is the PREEMPT_ACTIVE flag. )
*
* PREEMPT_MASK: 0x000000ff
* SOFTIRQ_MASK: 0x0000ff00
* HARDIRQ_MASK: 0x0fff0000
*/
#define PREEMPT_BITS 8
#define SOFTIRQ_BITS 8
#ifndef HARDIRQ_BITS
#define HARDIRQ_BITS 12
/*
* 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
#endif
#define PREEMPT_SHIFT 0
#define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
#define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
#define __IRQ_MASK(x) ((1UL << (x))-1)
#define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
#define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
#define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
#define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT)
#define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)
#define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
#define hardirq_count() (preempt_count() & HARDIRQ_MASK)
#define softirq_count() (preempt_count() & SOFTIRQ_MASK)
#define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))
/*
* 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())
#ifdef CONFIG_PREEMPT
# define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
# define preemptible() (preempt_count() == 0 && !irqs_disabled())
# define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
#else
# define in_atomic() (preempt_count() != 0)
# define preemptible() 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
#ifdef CONFIG_GENERIC_HARDIRQS
#define nmi_enter() (preempt_count() += HARDIRQ_OFFSET)
#define nmi_exit() (preempt_count() -= HARDIRQ_OFFSET)
#define irq_enter() (preempt_count() += HARDIRQ_OFFSET)
extern void irq_exit(void);
#endif
#endif /* LINUX_HARDIRQ_H */
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