1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
290 lines
7.8 KiB
C
290 lines
7.8 KiB
C
/* interrupt.h */
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#ifndef _LINUX_INTERRUPT_H
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#define _LINUX_INTERRUPT_H
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/linkage.h>
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#include <linux/bitops.h>
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#include <linux/preempt.h>
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#include <linux/cpumask.h>
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#include <linux/hardirq.h>
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#include <asm/atomic.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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/*
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* For 2.4.x compatibility, 2.4.x can use
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*
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* typedef void irqreturn_t;
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* #define IRQ_NONE
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* #define IRQ_HANDLED
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* #define IRQ_RETVAL(x)
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*
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* To mix old-style and new-style irq handler returns.
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*
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* IRQ_NONE means we didn't handle it.
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* IRQ_HANDLED means that we did have a valid interrupt and handled it.
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* IRQ_RETVAL(x) selects on the two depending on x being non-zero (for handled)
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*/
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typedef int irqreturn_t;
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#define IRQ_NONE (0)
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#define IRQ_HANDLED (1)
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#define IRQ_RETVAL(x) ((x) != 0)
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struct irqaction {
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irqreturn_t (*handler)(int, void *, struct pt_regs *);
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unsigned long flags;
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cpumask_t mask;
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const char *name;
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void *dev_id;
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struct irqaction *next;
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int irq;
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struct proc_dir_entry *dir;
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};
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extern irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs);
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extern int request_irq(unsigned int,
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irqreturn_t (*handler)(int, void *, struct pt_regs *),
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unsigned long, const char *, void *);
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extern void free_irq(unsigned int, void *);
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#ifdef CONFIG_GENERIC_HARDIRQS
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extern void disable_irq_nosync(unsigned int irq);
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extern void disable_irq(unsigned int irq);
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extern void enable_irq(unsigned int irq);
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#endif
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/*
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* Temporary defines for UP kernels, until all code gets fixed.
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*/
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#ifndef CONFIG_SMP
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static inline void __deprecated cli(void)
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{
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local_irq_disable();
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}
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static inline void __deprecated sti(void)
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{
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local_irq_enable();
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}
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static inline void __deprecated save_flags(unsigned long *x)
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{
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local_save_flags(*x);
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}
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#define save_flags(x) save_flags(&x);
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static inline void __deprecated restore_flags(unsigned long x)
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{
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local_irq_restore(x);
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}
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static inline void __deprecated save_and_cli(unsigned long *x)
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{
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local_irq_save(*x);
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}
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#define save_and_cli(x) save_and_cli(&x)
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#endif /* CONFIG_SMP */
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/* SoftIRQ primitives. */
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#define local_bh_disable() \
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do { add_preempt_count(SOFTIRQ_OFFSET); barrier(); } while (0)
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#define __local_bh_enable() \
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do { barrier(); sub_preempt_count(SOFTIRQ_OFFSET); } while (0)
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extern void local_bh_enable(void);
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/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
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frequency threaded job scheduling. For almost all the purposes
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tasklets are more than enough. F.e. all serial device BHs et
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al. should be converted to tasklets, not to softirqs.
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*/
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enum
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{
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HI_SOFTIRQ=0,
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TIMER_SOFTIRQ,
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NET_TX_SOFTIRQ,
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NET_RX_SOFTIRQ,
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SCSI_SOFTIRQ,
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TASKLET_SOFTIRQ
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};
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/* softirq mask and active fields moved to irq_cpustat_t in
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* asm/hardirq.h to get better cache usage. KAO
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*/
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struct softirq_action
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{
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void (*action)(struct softirq_action *);
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void *data;
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};
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asmlinkage void do_softirq(void);
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extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
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extern void softirq_init(void);
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#define __raise_softirq_irqoff(nr) do { local_softirq_pending() |= 1UL << (nr); } while (0)
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extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
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extern void FASTCALL(raise_softirq(unsigned int nr));
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/* Tasklets --- multithreaded analogue of BHs.
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Main feature differing them of generic softirqs: tasklet
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is running only on one CPU simultaneously.
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Main feature differing them of BHs: different tasklets
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may be run simultaneously on different CPUs.
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Properties:
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* If tasklet_schedule() is called, then tasklet is guaranteed
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to be executed on some cpu at least once after this.
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* If the tasklet is already scheduled, but its excecution is still not
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started, it will be executed only once.
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* If this tasklet is already running on another CPU (or schedule is called
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from tasklet itself), it is rescheduled for later.
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* Tasklet is strictly serialized wrt itself, but not
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wrt another tasklets. If client needs some intertask synchronization,
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he makes it with spinlocks.
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*/
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struct tasklet_struct
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{
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struct tasklet_struct *next;
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unsigned long state;
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atomic_t count;
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void (*func)(unsigned long);
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unsigned long data;
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};
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#define DECLARE_TASKLET(name, func, data) \
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struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
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#define DECLARE_TASKLET_DISABLED(name, func, data) \
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struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
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enum
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{
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TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
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TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
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};
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#ifdef CONFIG_SMP
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static inline int tasklet_trylock(struct tasklet_struct *t)
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{
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return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
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}
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static inline void tasklet_unlock(struct tasklet_struct *t)
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{
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smp_mb__before_clear_bit();
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clear_bit(TASKLET_STATE_RUN, &(t)->state);
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}
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static inline void tasklet_unlock_wait(struct tasklet_struct *t)
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{
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while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
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}
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#else
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#define tasklet_trylock(t) 1
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#define tasklet_unlock_wait(t) do { } while (0)
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#define tasklet_unlock(t) do { } while (0)
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#endif
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extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
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static inline void tasklet_schedule(struct tasklet_struct *t)
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{
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if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
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__tasklet_schedule(t);
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}
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extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
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static inline void tasklet_hi_schedule(struct tasklet_struct *t)
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{
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if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
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__tasklet_hi_schedule(t);
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}
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static inline void tasklet_disable_nosync(struct tasklet_struct *t)
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{
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atomic_inc(&t->count);
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smp_mb__after_atomic_inc();
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}
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static inline void tasklet_disable(struct tasklet_struct *t)
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{
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tasklet_disable_nosync(t);
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tasklet_unlock_wait(t);
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smp_mb();
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}
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static inline void tasklet_enable(struct tasklet_struct *t)
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{
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smp_mb__before_atomic_dec();
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atomic_dec(&t->count);
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}
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static inline void tasklet_hi_enable(struct tasklet_struct *t)
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{
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smp_mb__before_atomic_dec();
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atomic_dec(&t->count);
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}
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extern void tasklet_kill(struct tasklet_struct *t);
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extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
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extern void tasklet_init(struct tasklet_struct *t,
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void (*func)(unsigned long), unsigned long data);
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/*
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* Autoprobing for irqs:
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*
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* probe_irq_on() and probe_irq_off() provide robust primitives
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* for accurate IRQ probing during kernel initialization. They are
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* reasonably simple to use, are not "fooled" by spurious interrupts,
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* and, unlike other attempts at IRQ probing, they do not get hung on
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* stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
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*
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* For reasonably foolproof probing, use them as follows:
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*
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* 1. clear and/or mask the device's internal interrupt.
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* 2. sti();
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* 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
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* 4. enable the device and cause it to trigger an interrupt.
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* 5. wait for the device to interrupt, using non-intrusive polling or a delay.
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* 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
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* 7. service the device to clear its pending interrupt.
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* 8. loop again if paranoia is required.
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*
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* probe_irq_on() returns a mask of allocated irq's.
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*
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* probe_irq_off() takes the mask as a parameter,
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* and returns the irq number which occurred,
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* or zero if none occurred, or a negative irq number
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* if more than one irq occurred.
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*/
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#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
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static inline unsigned long probe_irq_on(void)
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{
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return 0;
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}
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static inline int probe_irq_off(unsigned long val)
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{
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return 0;
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}
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static inline unsigned int probe_irq_mask(unsigned long val)
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{
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return 0;
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}
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#else
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extern unsigned long probe_irq_on(void); /* returns 0 on failure */
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extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
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extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
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#endif
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#endif
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