- #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)
- #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 */