if (bootSpace == null) {
final VmArchitecture arch = VmUtils.getVm().getArch();
final long bootSize = AVAILABLE_START().sub(HEAP_START().toWord())
.toLong();
final int bootSizeMb = (int) (bootSize >>> 20);
bootSpace = new ImmortalSpace("boot",
BasePlan.DEFAULT_POLL_FREQUENCY, bootSizeMb, false);
}
return bootSpace;
}