--- linux-2.6.31.10/arch/powerpc/sysdev/mtvic.c	1970-01-01 03:00:00.000000000 +0300
+++ linux-2.6.31.10.new/arch/powerpc/sysdev/mtvic.c	2010-04-12 15:54:46.000000000 +0300
@@ -0,0 +1,73 @@
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <asm/mpic.h>
+#include <asm/mtvic.h>
+
+struct irq_host *virq_host;
+EXPORT_SYMBOL(virq_host);
+
+unsigned get_virq_nr(unsigned hwirq)
+{
+	return irq_create_mapping(virq_host, hwirq);
+}
+EXPORT_SYMBOL(get_virq_nr);
+
+void mtvic_mask_irq(unsigned int irq)
+{
+}
+
+void mtvic_unmask_irq(unsigned int irq)
+{
+}
+
+static struct irq_chip softirq_chip = {
+	.mask	= mtvic_mask_irq,
+	.unmask	= mtvic_unmask_irq,
+};
+
+static int mtvic_map(struct irq_host *h, unsigned int virq, irq_hw_number_t hw)
+{
+	set_irq_chip_and_handler(virq, &softirq_chip, handle_simple_irq);
+	return 0;
+}
+
+static struct irq_host_ops mtvic_ops = {
+	.map = mtvic_map,
+};
+
+void __init mtvic_init(int def)
+{
+	static unsigned virqs;
+
+	virq_host = irq_alloc_host(NULL, IRQ_HOST_MAP_LINEAR, 32,
+				   &mtvic_ops, 32);
+	virq_host->host_data = &virqs;
+
+	if (def)
+		irq_set_default_host(virq_host);
+}
+
+unsigned mtvic_get_irq(void)
+{
+	static unsigned i = 0;
+	unsigned *irqs = virq_host->host_data;
+
+	if (!irqs)
+		return NO_IRQ;
+
+	for (i = (i + 1) & 31; *irqs; i = (i + 1) & 31) {
+		if (*irqs & (1 << i)) {
+			atomic_sub(1 << i, (atomic_t *) irqs);
+			return irq_linear_revmap(virq_host, i);
+		}
+	}
+	return NO_IRQ;
+}
+
+unsigned rb_get_irq(void)
+{
+	unsigned irq = mtvic_get_irq();
+	if (irq != NO_IRQ) return irq;
+
+	return mpic_get_irq();
+}