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@@ -26,6 +26,48 @@
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#include <asm/system.h>
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#include <asm/uaccess.h>
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+static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
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+
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+int __devinit allocate_irqno(void)
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+{
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+ int irq;
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+
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+again:
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+ irq = find_first_zero_bit(irq_map, NR_IRQS);
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+
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+ if (irq >= NR_IRQS)
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+ return -ENOSPC;
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+
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+ if (test_and_set_bit(irq, irq_map))
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+ goto again;
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+
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+ return irq;
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+}
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+
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+EXPORT_SYMBOL_GPL(allocate_irqno);
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+
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+/*
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+ * Allocate the 16 legacy interrupts for i8259 devices. This happens early
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+ * in the kernel initialization so treating allocation failure as BUG() is
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+ * ok.
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+ */
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+void __init alloc_legacy_irqno(void)
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+{
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+ int i;
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+
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+ for (i = 0; i <= 16; i++)
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+ BUG_ON(test_and_set_bit(i, irq_map));
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+}
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+
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+void __devinit free_irqno(unsigned int irq)
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+{
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+ smp_mb__before_clear_bit();
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+ clear_bit(irq, irq_map);
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+ smp_mb__after_clear_bit();
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+}
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+
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+EXPORT_SYMBOL_GPL(free_irqno);
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+
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/*
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* 'what should we do if we get a hw irq event on an illegal vector'.
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* each architecture has to answer this themselves.
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