This is xnu-8019. See this file in:
_absolutetime_to_continuoustime
_absolutetime_to_nanoseconds
_assert_wait
_assert_wait_deadline
_assert_wait_timeout
_clock_absolutetime_interval_to_deadline
_clock_continuoustime_interval_to_deadline
_clock_delay_until
_clock_get_calendar_microtime
_clock_get_calendar_absolute_and_microtime
_clock_get_calendar_nanotime
_clock_get_system_microtime
_clock_get_system_nanotime
_clock_get_uptime
_clock_interval_to_absolutetime_interval
_clock_interval_to_deadline
_clock_timebase_info
_continuoustime_to_absolutetime
_current_task
_current_thread
_kernel_task
_kernel_thread_start
_lck_mtx_sleep
_lck_mtx_sleep_deadline
_lck_rw_sleep
_lck_rw_sleep_deadline
_lck_spin_sleep
_lck_spin_sleep_deadline
_mach_absolute_time
_mach_continuous_time
_mach_msg_send_from_kernel_proper
_mach_vm_pressure_level_monitor
_mach_vm_pressure_monitor
_nanoseconds_to_absolutetime
_preemption_enabled
_read_random
_read_frandom
_semaphore_create
_semaphore_dereference
_semaphore_destroy
_semaphore_reference
_semaphore_signal
_semaphore_signal_all
_semaphore_wait
_semaphore_wait_deadline
_semaphore_wait_noblock
_task_deallocate:_task_deallocate_external
_task_reference:_task_reference_external
_thread_block
_thread_block_parameter
_thread_call_allocate
_thread_call_allocate_with_options
_thread_call_cancel
_thread_call_enter
_thread_call_enter1
_thread_call_enter1_delayed
_thread_call_enter_delayed
_thread_call_free
_thread_deallocate
_thread_has_thread_name
_thread_policy_set
_thread_reference
_thread_set_thread_name
_thread_terminate
_thread_tid
_thread_wakeup_prim
_vm_kernel_addrhash:_vm_kernel_addrhash_external
_vm_kernel_addrhide
_vm_kernel_addrperm_external
_vm_kernel_unslide_or_perm_external
_vm_stats