in ncrx/netcons-gen.py [0:0]
def make_ext_header(seq, facility, level, cont):
"""
See printk.c's msg_print_ext_header for format spec.
"""
faclev = (facility.value << 3) | level.value
ts_usec = int(time.monotonic() * (10 ** 6))
return "{},{},{},{};".format(faclev, seq, ts_usec, "c" if cont else "-")