include/linux/interrupt.h

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 1 /* interrupt.h */
 2 #ifndef _LINUX_INTERRUPT_H
 3 #define _LINUX_INTERRUPT_H
 4
 5 #include <linux/kernel.h>
 6 #include <asm/bitops.h>
 7 #include <asm/atomic.h>
 8
 9 struct irqaction {
 10 void(*handler)(int,void*,struct pt_regs *);
 11 unsigned long flags;
 12 unsigned long mask;
 13 const char*name;
 14 void*dev_id;
 15 struct irqaction *next;
 16 };
 17
 18 extern volatileunsigned char bh_running;
 19
 20 externint bh_mask_count[32];
 21 externunsigned long bh_active;
 22 externunsigned long bh_mask;
 23 externvoid(*bh_base[32])(void);
 24
 25 asmlinkage voiddo_bottom_half(void);
 26
 27 /* Who gets which entry in bh_base. Things which will occur most often
 28  should come first - in which case NET should be up the top with SERIAL/TQUEUE! */
 29
 30 enum{
 31  TIMER_BH =0,
 32  CONSOLE_BH,
 33  TQUEUE_BH,
 34  DIGI_BH,
 35  SERIAL_BH,
 36  RISCOM8_BH,
 37  ESP_BH,
 38  NET_BH,
 39  IMMEDIATE_BH,
 40  KEYBOARD_BH,
 41  CYCLADES_BH,
 42  CM206_BH
 43 };
 44
 45 #include <asm/hardirq.h>
 46 #include <asm/softirq.h>
 47
 48 /*
 49  * Autoprobing for irqs:
 50  *
 51  * probe_irq_on() and probe_irq_off() provide robust primitives
 52  * for accurate IRQ probing during kernel initialization. They are
 53  * reasonably simple to use, are not "fooled" by spurious interrupts,
 54  * and, unlike other attempts at IRQ probing, they do not get hung on
 55  * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
 56  *
 57  * For reasonably foolproof probing, use them as follows:
 58  *
 59  * 1. clear and/or mask the device's internal interrupt.
 60  * 2. sti();
 61  * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
 62  * 4. enable the device and cause it to trigger an interrupt.
 63  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
 64  * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
 65  * 7. service the device to clear its pending interrupt.
 66  * 8. loop again if paranoia is required.
 67  *
 68  * probe_irq_on() returns a mask of allocated irq's.
 69  *
 70  * probe_irq_off() takes the mask as a parameter,
 71  * and returns the irq number which occurred,
 72  * or zero if none occurred, or a negative irq number
 73  * if more than one irq occurred.
 74  */
 75 externunsigned longprobe_irq_on(void);/* returns 0 on failure */
 76 externintprobe_irq_off(unsigned long);/* returns 0 or negative on failure */
 77
 78 #endif