This is xnu-8019. See this file in:
bsd/dev/arm64/conf.c		standard
bsd/dev/arm/cons.c		standard
bsd/dev/arm/km.c		standard
bsd/dev/arm/kern_machdep.c	standard
bsd/dev/arm/stubs.c		standard
bsd/dev/arm/systemcalls.c       standard
bsd/dev/arm64/sysctl.c          standard
bsd/dev/arm/unix_signal.c	standard

bsd/dev/arm64/cpu_in_cksum.s	standard
bsd/dev/arm64/cpu_copy_in_cksum.s optional skywalk
bsd/dev/arm64/cpu_memcmp_mask.s optional skywalk

#if defined(KERNEL_INTEGRITY_CTRR)
bsd/tests/ctrr_test_sysctl.c		optional config_xnupost
#endif /* defined(KERNEL_INTEGRITY_CTRR) */

bsd/dev/arm64/dtrace_isa.c	optional config_dtrace
bsd/dev/arm64/dtrace_subr_arm.c	optional config_dtrace
bsd/dev/arm64/fbt_arm.c		optional config_dtrace
bsd/dev/arm64/fasttrap_isa.c	optional config_dtrace
bsd/dev/arm64/disassembler.c	optional config_dtrace
bsd/dev/arm64/sdt_arm.c		optional config_dtrace

bsd/kern/bsd_stubs.c		standard