This is xnu-6153.11.26. See this file in:
Directory listing for xnu-6153.11.26//bsd/machine
Makefile
_limits.h
_mcontext.h
_param.h
_types.h
byte_order.h
cons.h
dis_tables.h
disklabel.h
endian.h
exec.h
fasttrap_isa.h
limits.h
param.h
profile.h
psl.h
ptrace.h
reg.h
signal.h
smp.h
types.h
vmparam.h