2 #ifndef _LINUX_INTERRUPT_H
3 #define _LINUX_INTERRUPT_H
5 #include <linux/kernel.h>
6 #include <linux/linkage.h>
7 #include <linux/bitops.h>
8 #include <linux/preempt.h>
9 #include <linux/cpumask.h>
10 #include <linux/irqreturn.h>
11 #include <linux/hardirq.h>
12 #include <linux/sched.h>
13 #include <asm/atomic.h>
14 #include <asm/ptrace.h>
15 #include <asm/system.h>
18 * These correspond to the IORESOURCE_IRQ_* defines in
19 * linux/ioport.h to select the interrupt line behaviour. When
20 * requesting an interrupt without specifying a IRQF_TRIGGER, the
21 * setting should be assumed to be "as already configured", which
22 * may be as per machine or firmware initialisation.
24 #define IRQF_TRIGGER_NONE 0x00000000
25 #define IRQF_TRIGGER_RISING 0x00000001
26 #define IRQF_TRIGGER_FALLING 0x00000002
27 #define IRQF_TRIGGER_HIGH 0x00000004
28 #define IRQF_TRIGGER_LOW 0x00000008
29 #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
30 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
31 #define IRQF_TRIGGER_PROBE 0x00000010
34 * These flags used only by the kernel as part of the
35 * irq handling routines.
37 * IRQF_DISABLED - keep irqs disabled when calling the action handler
38 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
39 * IRQF_SHARED - allow sharing the irq among several devices
40 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
41 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
43 #define IRQF_DISABLED 0x00000020
44 #define IRQF_SAMPLE_RANDOM 0x00000040
45 #define IRQF_SHARED 0x00000080
46 #define IRQF_PROBE_SHARED 0x00000100
47 #define IRQF_TIMER 0x00000200
50 * Migration helpers. Scheduled for removal in 1/2007
51 * Do not use for new code !
53 #define SA_INTERRUPT IRQF_DISABLED
54 #define SA_SAMPLE_RANDOM IRQF_SAMPLE_RANDOM
55 #define SA_SHIRQ IRQF_SHARED
56 #define SA_PROBEIRQ IRQF_PROBE_SHARED
58 #define SA_TRIGGER_LOW IRQF_TRIGGER_LOW
59 #define SA_TRIGGER_HIGH IRQF_TRIGGER_HIGH
60 #define SA_TRIGGER_FALLING IRQF_TRIGGER_FALLING
61 #define SA_TRIGGER_RISING IRQF_TRIGGER_RISING
62 #define SA_TRIGGER_MASK IRQF_TRIGGER_MASK
65 irqreturn_t (*handler)(int, void *, struct pt_regs *);
70 struct irqaction *next;
72 struct proc_dir_entry *dir;
75 extern irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs);
76 extern int request_irq(unsigned int,
77 irqreturn_t (*handler)(int, void *, struct pt_regs *),
78 unsigned long, const char *, void *);
79 extern void free_irq(unsigned int, void *);
82 #ifdef CONFIG_GENERIC_HARDIRQS
83 extern void disable_irq_nosync(unsigned int irq);
84 extern void disable_irq(unsigned int irq);
85 extern void enable_irq(unsigned int irq);
87 /* IRQ wakeup (PM) control: */
88 extern int set_irq_wake(unsigned int irq, unsigned int on);
90 static inline int enable_irq_wake(unsigned int irq)
92 return set_irq_wake(irq, 1);
95 static inline int disable_irq_wake(unsigned int irq)
97 return set_irq_wake(irq, 0);
102 #ifndef __ARCH_SET_SOFTIRQ_PENDING
103 #define set_softirq_pending(x) (local_softirq_pending() = (x))
104 #define or_softirq_pending(x) (local_softirq_pending() |= (x))
108 * Temporary defines for UP kernels, until all code gets fixed.
111 static inline void __deprecated cli(void)
115 static inline void __deprecated sti(void)
119 static inline void __deprecated save_flags(unsigned long *x)
121 local_save_flags(*x);
123 #define save_flags(x) save_flags(&x)
124 static inline void __deprecated restore_flags(unsigned long x)
126 local_irq_restore(x);
129 static inline void __deprecated save_and_cli(unsigned long *x)
133 #define save_and_cli(x) save_and_cli(&x)
134 #endif /* CONFIG_SMP */
136 /* SoftIRQ primitives. */
137 #define local_bh_disable() \
138 do { add_preempt_count(SOFTIRQ_OFFSET); barrier(); } while (0)
139 #define __local_bh_enable() \
140 do { barrier(); sub_preempt_count(SOFTIRQ_OFFSET); } while (0)
142 extern void local_bh_enable(void);
144 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
145 frequency threaded job scheduling. For almost all the purposes
146 tasklets are more than enough. F.e. all serial device BHs et
147 al. should be converted to tasklets, not to softirqs.
160 /* softirq mask and active fields moved to irq_cpustat_t in
161 * asm/hardirq.h to get better cache usage. KAO
164 struct softirq_action
166 void (*action)(struct softirq_action *);
170 asmlinkage void do_softirq(void);
171 extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
172 extern void softirq_init(void);
173 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
174 extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
175 extern void FASTCALL(raise_softirq(unsigned int nr));
178 /* Tasklets --- multithreaded analogue of BHs.
180 Main feature differing them of generic softirqs: tasklet
181 is running only on one CPU simultaneously.
183 Main feature differing them of BHs: different tasklets
184 may be run simultaneously on different CPUs.
187 * If tasklet_schedule() is called, then tasklet is guaranteed
188 to be executed on some cpu at least once after this.
189 * If the tasklet is already scheduled, but its excecution is still not
190 started, it will be executed only once.
191 * If this tasklet is already running on another CPU (or schedule is called
192 from tasklet itself), it is rescheduled for later.
193 * Tasklet is strictly serialized wrt itself, but not
194 wrt another tasklets. If client needs some intertask synchronization,
195 he makes it with spinlocks.
198 struct tasklet_struct
200 struct tasklet_struct *next;
203 void (*func)(unsigned long);
207 #define DECLARE_TASKLET(name, func, data) \
208 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
210 #define DECLARE_TASKLET_DISABLED(name, func, data) \
211 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
216 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */
217 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */
221 static inline int tasklet_trylock(struct tasklet_struct *t)
223 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
226 static inline void tasklet_unlock(struct tasklet_struct *t)
228 smp_mb__before_clear_bit();
229 clear_bit(TASKLET_STATE_RUN, &(t)->state);
232 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
234 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
237 #define tasklet_trylock(t) 1
238 #define tasklet_unlock_wait(t) do { } while (0)
239 #define tasklet_unlock(t) do { } while (0)
242 extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
244 static inline void tasklet_schedule(struct tasklet_struct *t)
246 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
247 __tasklet_schedule(t);
250 extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
252 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
254 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
255 __tasklet_hi_schedule(t);
259 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
261 atomic_inc(&t->count);
262 smp_mb__after_atomic_inc();
265 static inline void tasklet_disable(struct tasklet_struct *t)
267 tasklet_disable_nosync(t);
268 tasklet_unlock_wait(t);
272 static inline void tasklet_enable(struct tasklet_struct *t)
274 smp_mb__before_atomic_dec();
275 atomic_dec(&t->count);
278 static inline void tasklet_hi_enable(struct tasklet_struct *t)
280 smp_mb__before_atomic_dec();
281 atomic_dec(&t->count);
284 extern void tasklet_kill(struct tasklet_struct *t);
285 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
286 extern void tasklet_init(struct tasklet_struct *t,
287 void (*func)(unsigned long), unsigned long data);
290 * Autoprobing for irqs:
292 * probe_irq_on() and probe_irq_off() provide robust primitives
293 * for accurate IRQ probing during kernel initialization. They are
294 * reasonably simple to use, are not "fooled" by spurious interrupts,
295 * and, unlike other attempts at IRQ probing, they do not get hung on
296 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
298 * For reasonably foolproof probing, use them as follows:
300 * 1. clear and/or mask the device's internal interrupt.
302 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
303 * 4. enable the device and cause it to trigger an interrupt.
304 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
305 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
306 * 7. service the device to clear its pending interrupt.
307 * 8. loop again if paranoia is required.
309 * probe_irq_on() returns a mask of allocated irq's.
311 * probe_irq_off() takes the mask as a parameter,
312 * and returns the irq number which occurred,
313 * or zero if none occurred, or a negative irq number
314 * if more than one irq occurred.
317 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
318 static inline unsigned long probe_irq_on(void)
322 static inline int probe_irq_off(unsigned long val)
326 static inline unsigned int probe_irq_mask(unsigned long val)
331 extern unsigned long probe_irq_on(void); /* returns 0 on failure */
332 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
333 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */