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Linux Cross Reference
Linux/arch/um/kernel/irq.c

Version: ~ [ 0.6-2.3.46 ] ~
Architecture: ~ [ um ] ~ 
** Warning: Cannot open xref database.

  1 #include "linux/stddef.h"
  2 #include "asm/ptrace.h"
  3 #include "linux/cache.h"
  4 #include "linux/interrupt.h"
  5 #include "linux/mm.h"
  6 #include "linux/malloc.h"
  7 #include "linux/tasks.h"
  8 #include "asm/irq.h"
  9 #include "asm/signal.h"
 10 #include "asm/errno.h"
 11 
 12 extern void rand_initialize_irq(int irq);
 13 
 14 static struct irqaction *irq_action[NR_IRQS];
 15 
 16 unsigned int local_irq_count[NR_CPUS];
 17 
 18 static inline void unmask_irq(unsigned int irq_nr)
 19 {
 20 }
 21 
 22 int request_irq(unsigned int irq, 
 23                 void (*handler)(int, void *, struct pt_regs *),
 24                 unsigned long irqflags, 
 25                 const char * devname,
 26                 void *dev_id)
 27 {
 28         int shared = 0;
 29         struct irqaction * action, **p;
 30         unsigned long flags;
 31 
 32         if (irq >= NR_IRQS)
 33                 return -EINVAL;
 34         if (!handler)
 35                 return -EINVAL;
 36         p = irq_action + irq;
 37         action = *p;
 38         if (action) {
 39                 /* Can't share interrupts unless both agree to */
 40                 if (!(action->flags & irqflags & SA_SHIRQ))
 41                         return -EBUSY;
 42 
 43                 /* Can't share interrupts unless both are same type */
 44                 if ((action->flags ^ irqflags) & SA_INTERRUPT)
 45                         return -EBUSY;
 46 
 47                 /* add new interrupt at end of irq queue */
 48                 do {
 49                         p = &action->next;
 50                         action = *p;
 51                 } while (action);
 52                 shared = 1;
 53         }
 54 
 55         action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
 56                                              GFP_KERNEL);
 57         if (!action)
 58                 return -ENOMEM;
 59 
 60         if (irqflags & SA_SAMPLE_RANDOM)
 61                 rand_initialize_irq(irq);
 62 
 63         action->handler = handler;
 64         action->flags = irqflags;
 65         action->mask = 0;
 66         action->name = devname;
 67         action->next = NULL;
 68         action->dev_id = dev_id;
 69 
 70         save_flags(flags);
 71         cli();
 72         *p = action;
 73 
 74         if (!shared)
 75                 unmask_irq(irq);
 76 
 77         restore_flags(flags);
 78         return 0;
 79 }
 80                 
 81 unsigned long probe_irq_on(void)
 82 {
 83   return(1);
 84 }
 85 
 86 int probe_irq_off(unsigned long n)
 87 {
 88   return(1);
 89 }
 90
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