interrupt.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:7k
- /* interrupt.h */
- #ifndef _LINUX_INTERRUPT_H
- #define _LINUX_INTERRUPT_H
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/smp.h>
- #include <linux/cache.h>
- #include <asm/bitops.h>
- #include <asm/atomic.h>
- #include <asm/ptrace.h>
- struct irqaction {
- void (*handler)(int, void *, struct pt_regs *);
- unsigned long flags;
- unsigned long mask;
- const char *name;
- void *dev_id;
- struct irqaction *next;
- };
- /* Who gets which entry in bh_base. Things which will occur most often
- should come first */
-
- enum {
- TIMER_BH = 0,
- TQUEUE_BH,
- DIGI_BH,
- SERIAL_BH,
- RISCOM8_BH,
- SPECIALIX_BH,
- AURORA_BH,
- ESP_BH,
- SCSI_BH,
- IMMEDIATE_BH,
- CYCLADES_BH,
- CM206_BH,
- JS_BH,
- MACSERIAL_BH,
- ISICOM_BH
- };
- #include <asm/hardirq.h>
- #include <asm/softirq.h>
- /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
- frequency threaded job scheduling. For almost all the purposes
- tasklets are more than enough. F.e. all serial device BHs et
- al. should be converted to tasklets, not to softirqs.
- */
- enum
- {
- HI_SOFTIRQ=0,
- NET_TX_SOFTIRQ,
- NET_RX_SOFTIRQ,
- TASKLET_SOFTIRQ
- };
- /* softirq mask and active fields moved to irq_cpustat_t in
- * asm/hardirq.h to get better cache usage. KAO
- */
- struct softirq_action
- {
- void (*action)(struct softirq_action *);
- void *data;
- };
- asmlinkage void do_softirq(void);
- extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
- extern void softirq_init(void);
- #define __cpu_raise_softirq(cpu, nr) do { softirq_pending(cpu) |= 1UL << (nr); } while (0)
- extern void FASTCALL(cpu_raise_softirq(unsigned int cpu, unsigned int nr));
- extern void FASTCALL(raise_softirq(unsigned int nr));
- /* Tasklets --- multithreaded analogue of BHs.
- Main feature differing them of generic softirqs: tasklet
- is running only on one CPU simultaneously.
- Main feature differing them of BHs: different tasklets
- may be run simultaneously on different CPUs.
- Properties:
- * If tasklet_schedule() is called, then tasklet is guaranteed
- to be executed on some cpu at least once after this.
- * If the tasklet is already scheduled, but its excecution is still not
- started, it will be executed only once.
- * If this tasklet is already running on another CPU (or schedule is called
- from tasklet itself), it is rescheduled for later.
- * Tasklet is strictly serialized wrt itself, but not
- wrt another tasklets. If client needs some intertask synchronization,
- he makes it with spinlocks.
- */
- struct tasklet_struct
- {
- struct tasklet_struct *next;
- unsigned long state;
- atomic_t count;
- void (*func)(unsigned long);
- unsigned long data;
- };
- #define DECLARE_TASKLET(name, func, data)
- struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
- #define DECLARE_TASKLET_DISABLED(name, func, data)
- struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
- enum
- {
- TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
- TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
- };
- struct tasklet_head
- {
- struct tasklet_struct *list;
- } __attribute__ ((__aligned__(SMP_CACHE_BYTES)));
- extern struct tasklet_head tasklet_vec[NR_CPUS];
- extern struct tasklet_head tasklet_hi_vec[NR_CPUS];
- #ifdef CONFIG_SMP
- static inline int tasklet_trylock(struct tasklet_struct *t)
- {
- return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
- }
- static inline void tasklet_unlock(struct tasklet_struct *t)
- {
- smp_mb__before_clear_bit();
- clear_bit(TASKLET_STATE_RUN, &(t)->state);
- }
- static inline void tasklet_unlock_wait(struct tasklet_struct *t)
- {
- while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
- }
- #else
- #define tasklet_trylock(t) 1
- #define tasklet_unlock_wait(t) do { } while (0)
- #define tasklet_unlock(t) do { } while (0)
- #endif
- extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
- static inline void tasklet_schedule(struct tasklet_struct *t)
- {
- if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
- __tasklet_schedule(t);
- }
- extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
- static inline void tasklet_hi_schedule(struct tasklet_struct *t)
- {
- if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
- __tasklet_hi_schedule(t);
- }
- static inline void tasklet_disable_nosync(struct tasklet_struct *t)
- {
- atomic_inc(&t->count);
- smp_mb__after_atomic_inc();
- }
- static inline void tasklet_disable(struct tasklet_struct *t)
- {
- tasklet_disable_nosync(t);
- tasklet_unlock_wait(t);
- smp_mb();
- }
- static inline void tasklet_enable(struct tasklet_struct *t)
- {
- smp_mb__before_atomic_dec();
- atomic_dec(&t->count);
- }
- static inline void tasklet_hi_enable(struct tasklet_struct *t)
- {
- smp_mb__before_atomic_dec();
- atomic_dec(&t->count);
- }
- extern void tasklet_kill(struct tasklet_struct *t);
- extern void tasklet_init(struct tasklet_struct *t,
- void (*func)(unsigned long), unsigned long data);
- #ifdef CONFIG_SMP
- #define SMP_TIMER_NAME(name) name##__thr
- #define SMP_TIMER_DEFINE(name, task)
- DECLARE_TASKLET(task, name##__thr, 0);
- static void name (unsigned long dummy)
- {
- tasklet_schedule(&(task));
- }
- #else /* CONFIG_SMP */
- #define SMP_TIMER_NAME(name) name
- #define SMP_TIMER_DEFINE(name, task)
- #endif /* CONFIG_SMP */
- /* Old BH definitions */
- extern struct tasklet_struct bh_task_vec[];
- /* It is exported _ONLY_ for wait_on_irq(). */
- extern spinlock_t global_bh_lock;
- static inline void mark_bh(int nr)
- {
- tasklet_hi_schedule(bh_task_vec+nr);
- }
- extern void init_bh(int nr, void (*routine)(void));
- extern void remove_bh(int nr);
- /*
- * Autoprobing for irqs:
- *
- * probe_irq_on() and probe_irq_off() provide robust primitives
- * for accurate IRQ probing during kernel initialization. They are
- * reasonably simple to use, are not "fooled" by spurious interrupts,
- * and, unlike other attempts at IRQ probing, they do not get hung on
- * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
- *
- * For reasonably foolproof probing, use them as follows:
- *
- * 1. clear and/or mask the device's internal interrupt.
- * 2. sti();
- * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
- * 4. enable the device and cause it to trigger an interrupt.
- * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
- * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
- * 7. service the device to clear its pending interrupt.
- * 8. loop again if paranoia is required.
- *
- * probe_irq_on() returns a mask of allocated irq's.
- *
- * probe_irq_off() takes the mask as a parameter,
- * and returns the irq number which occurred,
- * or zero if none occurred, or a negative irq number
- * if more than one irq occurred.
- */
- extern unsigned long probe_irq_on(void); /* returns 0 on failure */
- extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
- extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */
- #endif