root/include/linux/interrupt.h

/* [previous][next][first][last][top][bottom][index][help] */

INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. mark_bh
  2. disable_bh
  3. enable_bh

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

/* [previous][next][first][last][top][bottom][index][help] */