OFW_VIRT_SIZE
(va + size) > (OFW_VIRT_BASE + OFW_VIRT_SIZE) ||
(va + size) > (OFW_VIRT_BASE + OFW_VIRT_SIZE) ||
va >= (OFW_VIRT_BASE + OFW_VIRT_SIZE)) {
#define IO_VIRT_BASE (OFW_VIRT_BASE + OFW_VIRT_SIZE)