include/linux/interrupt.h

14836 /* interrupt.h */
14837 #ifndef _LINUX_INTERRUPT_H
14838 #define _LINUX_INTERRUPT_H
14839 
14840 #include <linux/kernel.h>
14841 #include <asm/bitops.h>
14842 #include <asm/atomic.h>
14843 
14844 struct irqaction {
14845   void (*handler)(int, void *, struct pt_regs *);
14846   unsigned long flags;
14847   unsigned long mask;
14848   const char *name;
14849   void *dev_id;
14850   struct irqaction *next;
14851 };
14852 
14853 extern volatile unsigned char bh_running;
14854 
14855 extern atomic_t bh_mask_count[32];
14856 extern unsigned long bh_active;
14857 extern unsigned long bh_mask;
14858 extern void (*bh_base[32])(void);
14859 
14860 asmlinkage void do_bottom_half(void);
14861 
14862 /* Who gets which entry in bh_base.  Things which will
14863    occur most often should come first - in which case NET
14864    should be up the top with SERIAL/TQUEUE! */
14865 
14866 enum {
14867   TIMER_BH = 0,
14868   CONSOLE_BH,
14869   TQUEUE_BH,
14870   DIGI_BH,
14871   SERIAL_BH,
14872   RISCOM8_BH,
14873   SPECIALIX_BH,
14874   ESP_BH,
14875   NET_BH,
14876   SCSI_BH,
14877   IMMEDIATE_BH,
14878   KEYBOARD_BH,
14879   CYCLADES_BH,
14880   CM206_BH,
14881   JS_BH,
14882   MACSERIAL_BH,
14883   ISICOM_BH
14884 };
14885 
14886 #include <asm/hardirq.h>
14887 #include <asm/softirq.h>
14888 
14889 /* Autoprobing for irqs:
14890  *
14891  * probe_irq_on() and probe_irq_off() provide robust
14892  * primitives for accurate IRQ probing during kernel
14893  * initialization.  They are reasonably simple to use,
14894  * are not "fooled" by spurious interrupts, and, unlike
14895  * other attempts at IRQ probing, they do not get hung on
14896  * stuck interrupts (such as unused PS2 mouse interfaces
14897  * on ASUS boards).
14898  *
14899  * For reasonably foolproof probing, use them as follows:
14900  *
14901  * 1. clear and/or mask the device's internal interrupt.
14902  * 2. sti();
14903  * 3. irqs = probe_irq_on();
14904  *    // "take over" all unassigned idle IRQs
14905  * 4. enable the device and cause it to trigger
14906  *    an interrupt.
14907  * 5. wait for the device to interrupt, using
14908  *    non-intrusive polling or a delay.
14909  * 6. irq = probe_irq_off(irqs);
14910  *    // get IRQ number, 0=none, negative=multiple
14911  * 7. service the device to clear its pending interrupt.
14912  * 8. loop again if paranoia is required.
14913  *
14914  * probe_irq_on() returns a mask of allocated irq's.
14915  *
14916  * probe_irq_off() takes the mask as a parameter,
14917  * and returns the irq number which occurred,
14918  * or zero if none occurred, or a negative irq number
14919  * if more than one irq occurred.  */
14920 extern unsigned long probe_irq_on(void); /*== 0 on fail*/
14921 extern int probe_irq_off(unsigned long); /*<= 0 on fail*/
14922 
14923 #endif