B_CONTROLLER
B_CONTROLLER(bootdev), B_UNIT(bootdev),
slave = B_CONTROLLER(bootdev);
ctlr = B_CONTROLLER(bootdev);
bctlr = B_CONTROLLER(bootdev);
bctlr = B_CONTROLLER(bootdev);
booted_ctlr = B_CONTROLLER(bootdev);
controller = B_CONTROLLER(bootdev);
#define B_X68K_SCSI_IF_UN(val) B_CONTROLLER(val)