RADIX_KERN_IO_START  107 arch/powerpc/include/asm/book3s/64/radix.h #define RADIX_KERN_IO_END	(RADIX_KERN_IO_START + RADIX_KERN_IO_SIZE)
RADIX_KERN_IO_START  582 arch/powerpc/mm/book3s64/radix_pgtable.c 	__kernel_io_start = RADIX_KERN_IO_START;