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2 pj 1 
#include<asm/bitops.h>
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#include<kernel/kern.h>
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#include <time.h>
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struct device *irq2dev_map[16] = {0, 0, /* ... zeroed */};
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static DWORD handled;           /* The irq lines we have a handler on. */
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static volatile int irq_number = 0;                     /* The latest irq number we actually found. */
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static void autoirq_probe(int irq)
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{
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        irq_number = irq;
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        cprintf("Autoirq: %d\n", irq);
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        return;
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}
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int autoirq_setup(int waittime)
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{
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        int i;
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        struct timespec delay;
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        handled = 0;
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        for (i = 0; i < 16; i++) {
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                if (handler_set(i, autoirq_probe, NIL, TRUE) == 1) {
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                                set_bit(i, (void *)&handled);
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                }
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        }
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        /* Hang out at least <waittime> jiffies waiting for bogus IRQ hits. */
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        delay.tv_sec = waittime/1000000;
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        delay.tv_nsec = (waittime%1000000)*1000;
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        nanosleep(&delay, NULL);
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        return handled;
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}
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int autoirq_report(int waittime)
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{
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    struct timespec delay;
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        int i;
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        /* Hang out at least <waittime> jiffies waiting for the IRQ. */
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    delay.tv_sec=waittime/1000000;
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        delay.tv_nsec=(waittime%1000000)*1000;
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        nanosleep(&delay, NULL);
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        /* Retract the irq handlers that we installed. */
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        for (i = 0; i < 16; i++) {
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                if (test_bit(i, (void *)&handled))
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                        handler_remove(i);
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        }
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        return irq_number;
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}
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/*
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 * Local variables:
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 *  compile-command: "gcc -DKERNEL -Wall -O6 -fomit-frame-pointer -I/usr/src/linux/net/tcp -c auto_irq.c"
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 *  version-control: t
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 *  kept-new-versions: 5
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 *  c-indent-level: 4
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 *  tab-width: 4
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 * End:
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 */