[mirror_ubuntu-kernels.git] / include / linux / hardirq.h

#ifndef LINUX_HARDIRQ_H
#define LINUX_HARDIRQ_H

#include <linux/config.h>
#include <linux/preempt.h>
#include <linux/smp_lock.h>
#include <asm/hardirq.h>
#include <asm/system.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 SOFTIRQ_MASK	(__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
#define HARDIRQ_MASK	(__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)

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

#if PREEMPT_ACTIVE < (1 << (HARDIRQ_SHIFT + HARDIRQ_BITS))
#error PREEMPT_ACTIVE is too low!
#endif

#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())

#if defined(CONFIG_PREEMPT) && !defined(CONFIG_PREEMPT_BKL)
# define in_atomic()	((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
#else
# define in_atomic()	((preempt_count() & ~PREEMPT_ACTIVE) != 0)
#endif

#ifdef CONFIG_PREEMPT
# define preemptible()	(preempt_count() == 0 && !irqs_disabled())
# define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
#else
# 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

#define nmi_enter()		irq_enter()
#define nmi_exit()		sub_preempt_count(HARDIRQ_OFFSET)

struct task_struct;

#ifndef CONFIG_VIRT_CPU_ACCOUNTING
static inline void account_user_vtime(struct task_struct *tsk)
{
}

static inline void account_system_vtime(struct task_struct *tsk)
{
}
#endif

#define irq_enter()					\
	do {						\
		account_system_vtime(current);		\
		add_preempt_count(HARDIRQ_OFFSET);	\
	} while (0)

extern void irq_exit(void);

#endif /* LINUX_HARDIRQ_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef LINUX_HARDIRQ_H
	2	#define LINUX_HARDIRQ_H
	3
	4	#include <linux/config.h>
67bc4eb0	5	#include <linux/preempt.h>
1da177e4 LT	6	#include <linux/smp_lock.h>
	7	#include <asm/hardirq.h>
	8	#include <asm/system.h>
	9
	10	/*
	11	* We put the hardirq and softirq counter into the preemption
	12	* counter. The bitmask has the following meaning:
	13	*
	14	* - bits 0-7 are the preemption count (max preemption depth: 256)
	15	* - bits 8-15 are the softirq count (max # of softirqs: 256)
	16	*
	17	* The hardirq count can be overridden per architecture, the default is:
	18	*
	19	* - bits 16-27 are the hardirq count (max # of hardirqs: 4096)
	20	* - ( bit 28 is the PREEMPT_ACTIVE flag. )
	21	*
	22	* PREEMPT_MASK: 0x000000ff
	23	* SOFTIRQ_MASK: 0x0000ff00
	24	* HARDIRQ_MASK: 0x0fff0000
	25	*/
	26	#define PREEMPT_BITS 8
	27	#define SOFTIRQ_BITS 8
	28
	29	#ifndef HARDIRQ_BITS
	30	#define HARDIRQ_BITS 12
	31	/*
	32	* The hardirq mask has to be large enough to have space for potentially
	33	* all IRQ sources in the system nesting on a single CPU.
	34	*/
	35	#if (1 << HARDIRQ_BITS) < NR_IRQS
	36	# error HARDIRQ_BITS is too low!
	37	#endif
	38	#endif
	39
	40	#define PREEMPT_SHIFT 0
	41	#define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
	42	#define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
	43
	44	#define __IRQ_MASK(x) ((1UL << (x))-1)
	45
	46	#define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
1da177e4	47	#define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
8f28e8fa	48	#define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
1da177e4 LT	49
	50	#define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT)
	51	#define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)
	52	#define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
	53
8f28e8fa PBG	54	#if PREEMPT_ACTIVE < (1 << (HARDIRQ_SHIFT + HARDIRQ_BITS))
	55	#error PREEMPT_ACTIVE is too low!
	56	#endif
	57
1da177e4 LT	58	#define hardirq_count() (preempt_count() & HARDIRQ_MASK)
	59	#define softirq_count() (preempt_count() & SOFTIRQ_MASK)
	60	#define irq_count() (preempt_count() & (HARDIRQ_MASK \| SOFTIRQ_MASK))
	61
	62	/*
	63	* Are we doing bottom half or hardware interrupt processing?
	64	* Are we in a softirq context? Interrupt context?
	65	*/
	66	#define in_irq() (hardirq_count())
	67	#define in_softirq() (softirq_count())
	68	#define in_interrupt() (irq_count())
	69
	70	#if defined(CONFIG_PREEMPT) && !defined(CONFIG_PREEMPT_BKL)
	71	# define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
	72	#else
	73	# define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0)
	74	#endif
	75
	76	#ifdef CONFIG_PREEMPT
	77	# define preemptible() (preempt_count() == 0 && !irqs_disabled())
	78	# define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
	79	#else
	80	# define preemptible() 0
	81	# define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
	82	#endif
	83
	84	#ifdef CONFIG_SMP
	85	extern void synchronize_irq(unsigned int irq);
	86	#else
	87	# define synchronize_irq(irq) barrier()
	88	#endif
	89
	90	#define nmi_enter() irq_enter()
	91	#define nmi_exit() sub_preempt_count(HARDIRQ_OFFSET)
	92
f037360f AV	93	struct task_struct;
f037360f AV	94
1da177e4 LT	95	#ifndef CONFIG_VIRT_CPU_ACCOUNTING
	96	static inline void account_user_vtime(struct task_struct *tsk)
	97	{
	98	}
	99
	100	static inline void account_system_vtime(struct task_struct *tsk)
	101	{
	102	}
	103	#endif
	104
	105	#define irq_enter() \
	106	do { \
	107	account_system_vtime(current); \
	108	add_preempt_count(HARDIRQ_OFFSET); \
	109	} while (0)
	110
	111	extern void irq_exit(void);
	112
	113	#endif /* LINUX_HARDIRQ_H */