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495 giacomo 1 
#include <linuxcomp.h>
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#include <asm/ptrace.h>
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#include <asm-generic/errno-base.h>
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#include <linux/kernel.h>
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#define NIL -1
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static struct {
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        void (*func)(int, void *dev_id, struct pt_regs *);
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        void *data;
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        int flags;
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} handlers[16];
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unsigned long intr_count = 0;
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/*
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 * Generic Linux interrupt handler.
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 */
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static void linux_intr(int irq)
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{
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        struct pt_regs regs;
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        //printk("linux_intr %d\n", irq);
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        intr_count++;
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        (*handlers[irq].func)(irq, handlers[irq].data, &regs);
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        intr_count--;
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}
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/*
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 * Attach a handler to an IRQ.
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 */
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int request_irq(unsigned int irq, void (*handler)(int, void *dev_id, struct pt_regs *), unsigned long flags, const char *device, void *dev_id)
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{
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        if (handlers[irq].func) {
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                return (-EBUSY);
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        }
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        handlers[irq].func = handler;
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        handlers[irq].flags = flags;
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        handlers[irq].data = dev_id;
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        shark_handler_set(irq, linux_intr, NIL, TRUE);
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        return 0;
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}
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/*
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 * Deallocate an irq.
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 */
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void free_irq(unsigned int irq, void *a)
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{
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        shark_handler_remove(irq);
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        handlers[irq].func = 0;
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}