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Rev 2218 Rev 2439
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static irq_ownership_t i8254_claim(void)
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static irq_ownership_t i8254_claim(void)
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{
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{
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    return IRQ_ACCEPT;
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    return IRQ_ACCEPT;
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}
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}
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static void i8254_irq_handler(irq_t *irq, void *arg, ...)
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static void i8254_irq_handler(irq_t *irq, void *arg __attribute__((unused)), ...)
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{
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{
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    /*
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    /*
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     * This IRQ is responsible for kernel preemption.
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     * This IRQ is responsible for kernel preemption.
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     * Nevertheless, we are now holding a spinlock which prevents
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     * Nevertheless, we are now holding a spinlock which prevents
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     * preemption. For this particular IRQ, we don't need the
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     * preemption. For this particular IRQ, we don't need the
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    outb(CLK_PORT1, 0xff);
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    outb(CLK_PORT1, 0xff);
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    do {
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    do {
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        /* will read both status and count */
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        /* will read both status and count */
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        outb(CLK_PORT4, 0xc2);
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        outb(CLK_PORT4, 0xc2);
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        not_ok = (inb(CLK_PORT1)>>6)&1;
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        not_ok = (uint8_t) ((inb(CLK_PORT1) >> 6) & 1);
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        t1 = inb(CLK_PORT1);
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        t1 = inb(CLK_PORT1);
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        t1 |= inb(CLK_PORT1) << 8;
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        t1 |= inb(CLK_PORT1) << 8;
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    } while (not_ok);
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    } while (not_ok);
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    asm_delay_loop(LOOPS);
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    asm_delay_loop(LOOPS);