IRQ_MASK_LOW_OFF
#define IRQ_MASK_LOW (IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF)
stat &= readl_relaxed(dove_irq_base + IRQ_MASK_LOW_OFF);
orion_irq_init(1, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF);
stat &= readl_relaxed(mv78xx0_irq_base + IRQ_MASK_LOW_OFF);
orion_irq_init(0, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF);