IOC_BASE
#define ioc_readb(off) __raw_readb(IOC_BASE + (off))
#define ioc_writeb(val,off) __raw_writeb(val, IOC_BASE + (off))
reg = readb(IOC_BASE + IOMD_IRQREQB);
reg = readb(IOC_BASE + IOMD_DMAREQ);
reg = readb(IOC_BASE + IOMD_IRQREQA);