xref: /xnu-11417.121.6/config/MASTER (revision a1e26a70f38d1d7daa7b49b258e2f8538ad81650)

#
# Mach Operating System
# Copyright (c) 1986 Carnegie-Mellon University
# Copyright 2001-2018 Apple Inc.
#
# All rights reserved.  The CMU software License Agreement
# specifies the terms and conditions for use and redistribution.
#
#######################################################################
#
#	Master machine independent configuration file.
#
#	Specific configuration files are created based on this and
#	the machine specific master file using the doconf script.
#
#	Any changes to the master configuration files will affect all
#	other configuration files based upon it.
#
#######################################################################
#
#	To build a configuration, execute "doconf <configuration>."
#	Configurations are specified in the "Configurations:" section
#	of the MASTER and MASTER.* files as follows:
#
#	<configuration> = [ <attribute0> <attribute1> ... <attributeN> ]
#
#	Lines in the MASTER and MASTER.* files are selected based on
#	the attribute selector list, found in a comment at the end of
#	the line.  This is a list of attributes separated by commas.
#	The "!" operator selects the line if none of the attributes are
#	specified.
#
#	For example:
#
#	<foo,bar>	selects a line if "foo" or "bar" are specified.
#	<!foo,bar>	selects a line if neither "foo" nor "bar" is
#			specified.
#
#	Lines with no attributes specified are selected for all
#	configurations.
#
#######################################################################
#
#  SYSTEM SIZE CONFIGURATION (select exactly one)
#
#	xlarge = extra large scale system configuration
#	large  = large scale system configuration
#	medium = medium scale system configuration
#	small  = small scale system configuration
#	xsmall = extra small scale system configuration
#	bsmall = special extra small scale system configuration
#
#######################################################################
#

options		INET		#				# <inet>

options 	MACH		# Standard Mach features	# <mach>
options		MACH_FLIPC	# Fast-Local IPC		# <mach_flipc>
options		LOOP		# loopback support		# <loop>
options		VLAN		#				# <vlan>
options		BOND		#				# <bond>
options		IF_FAKE		#				# <if_fake>
options		IF_HEADLESS	#				# <if_headless>
options		IF_REDIRECT	#				# <if_redirect>
options		AH_ALL_CRYPTO	# AH all crypto algs		# <ah_all_crypto>
options		PF		# Packet Filter			# <pf>
options		PF_ECN		# PF use ECN marking		# <pf_ecn>
options		PFLOG		# PF log interface		# <pflog>
options		MEASURE_BW	# interface bandwidth measurement # <measure_bw>
options		DUMMYNET	# dummynet support		# <dummynet>
options		TRAFFIC_MGT	# traffic management support		# <traffic_mgt>
options		MULTICAST	# Internet Protocol Class-D	$
options		IFNET_INPUT_SANITY_CHK	# allow dlil/ifnet input sanity check # <ifnet_input_chk>
options		MULTIPATH	# Multipath domain		# <multipath>
options		MPTCP		# Multipath TCP			# <mptcp>
options		SYSV_SEM	# SVID semaphores		# <sysv_sem>
options		SYSV_MSG	# SVID messages			# <sysv_msg>
options		SYSV_SHM	# SVID shared mem		# <sysv_shm>
options		PSYNCH		# pthread synch			# <psynch>
options		FLOW_DIVERT								# <flow_divert>
options		NECP									# <necp>
options		CONTENT_FILTER	#						# <content_filter>
options 	PACKET_MANGLER	#						# <packet_mangler>
options 	REMOTE_VIF	#						# <remote_vif>
options		SKYWALK		#		# <skywalk>
options		CONFIG_NEXUS_USER_PIPE	#	# <config_nexus_user_pipe>
options		CONFIG_NEXUS_KERNEL_PIPE #	# <config_nexus_kernel_pipe>
options		CONFIG_NEXUS_MONITOR	#	# <config_nexus_monitor>
options		CONFIG_NEXUS_FLOWSWITCH	#	# <config_nexus_flowswitch>
options		CONFIG_NEXUS_NETIF	#	# <config_nexus_netif>
options		CONFIG_MBUF_MCACHE	# mbufs use mcache	# <config_mbuf_mcache>
options		KCTL_TEST		# kernel control test	# <kctl_test>

# secure_kernel - secure kernel from user programs
options     SECURE_KERNEL       # <secure_kernel>

#
#	4.4 general kernel
#
options		SOCKETS		# socket support		# <inet>
options 	DIAGNOSTIC	# diagnostics			# <diagnostic>
options		PROFILE		# kernel profiling		# <profile>
options		SENDFILE	# sendfile					# <sendfile>
options		NETWORKING	# networking layer		# <inet>
options		CONFIG_FSE	# file system events		# <config_fse>
options		CONFIG_IMAGEBOOT	# local image boot	# <config_imageboot>
options		CONFIG_MBUF_JUMBO	# jumbo cluster pool	# <config_mbuf_jumbo>
options		CONFIG_IMAGEBOOT_IMG4	# authenticate image with AppleImage4	# <config_imageboot_img4>
options		CONFIG_IMAGEBOOT_CHUNKLIST	# authenticate image with a chunk list	# <config_imageboot_chunklist>

options		CONFIG_WORKLOOP_DEBUG	# <config_workloop_debug>

#
#	4.4 filesystems
#
options		MOCKFS		# Boot from an executable	# <mockfs>
options		FIFO		# fifo support			# <fifo>
options		FDESC		# fdesc_fs support		# <fdesc>
options		DEVFS		# devfs support			# <devfs>
options		ROUTEFS		# routefs support		# <routefs>
options		NULLFS		# nullfs support 		# <nullfs>
options		BINDFS		# bindfs support 		# <bindfs>
options		FS_COMPRESSION	# fs compression	    # <fs_compression>
options		CONFIG_DEV_KMEM	    # /dev/kmem device for reading KVA	# <config_dev_kmem>

#
#	file system features
#
options		QUOTA		# file system quotas		# <quota>
options		NAMEDSTREAMS	# named stream vnop support	# <namedstreams>
options		CONFIG_APPLEDOUBLE # apple double support	# <config_appledouble>
options		CONFIG_VOLFS	# volfs path support (legacy)	# <config_volfs>
options		CONFIG_IMGSRC_ACCESS # source of imageboot dmg	# <config_imgsrc_access>
options		CONFIG_TRIGGERS	# trigger vnodes		# <config_triggers>
options		CONFIG_EXT_RESOLVER # e.g. memberd		# <config_ext_resolver>
options		CONFIG_SEARCHFS	# searchfs syscall support	# <config_searchfs>
options		CONFIG_MNT_SUID # allow suid binaries  # <config_mnt_suid>
options		CONFIG_MNT_ROOTSNAP # allow rooting from snapshot # <config_mnt_rootsnap>
options 	CONFIG_ROSV_STARTUP # allow read-only system volume startup # <config_rosv_startup>
options		CONFIG_FIRMLINKS # support "firmlinks" # <config_firmlinks>
options 	CONFIG_MOUNT_VM # mount VM volume on startup # <config_mount_vm>
options 	CONFIG_MOUNT_PREBOOTRECOVERY # mount Preboot and/or Recovery volume on startup # <config_mount_prebootrecovery>
options		CONFIG_DATALESS_FILES # support dataless file materialization # <config_dataless_files>
options         CONFIG_BASESYSTEMROOT # mount BaseSystem as initial root filesystem on some kinds of startup # <config_basesystemroot>
options         CONFIG_UNION_MOUNTS # support union mounts # <config_union_mounts>
options		CONFIG_FILE_LEASES # local file leasing support # <config_file_leases>

#
# VFS debugging
#
options		CONFIG_IOCOUNT_TRACE	# enable vnode's iocount tracing # <config_iocount_trace>

# NFS support
#
options		NFSSERVER	# Be an NFS server		# <nfsserver>
options		CONFIG_NETBOOT	# network booting		# <config_netboot>

#
# Machine Independent Apple Features
#
profile				# build a profiling kernel	# <profile>

#
# IPv6 Support
#
options         IPSEC           # IP security            	# <ipsec>
options         IPSEC_ESP       # IP security            	# <ipsec>

pseudo-device   gif     1				# <gif>
pseudo-device   dummy   2				# <dummy>
pseudo-device   stf 	1 				# <stf>

options			CRYPTO				# <ipsec,crypto>
options			CRYPTO_SHA2			# <crypto_sha2>
options			ENCRYPTED_SWAP			# <encrypted_swap>

options			CONFIG_IMG4			# <config_img4>

options		ZLIB	# inflate/deflate support	# <zlib>
options		ZLIBC	# inflate/deflate support	# <zlibc>

options		IF_BRIDGE				# <if_bridge>

#
#  configurable kernel event related resources
#
options   CONFIG_KN_HASHSIZE=64		# <medium,large,xlarge>
options   CONFIG_KN_HASHSIZE=48		# <small,xsmall>
options   CONFIG_KN_HASHSIZE=20		# <bsmall>

#
#  configurable vfs related resources
#  CONFIG_VNODES - used to pre allocate vnode related resources
#  CONFIG_NC_HASH - name cache hash table allocation
#  CONFIG_VFS_NAMES - name strings
#
#  263168 magic number for medium CONFIG_VNODES is based on memory
#  Number vnodes  is (memsize/64k) + 1024
#  This is the calculation that is used by launchd in tiger
#  we are clipping the max based on 16G
#  ie ((16*1024*1024*1024)/(64 *1024)) + 1024 = 263168;

options   CONFIG_VNODES=263168		# <large,xlarge>
options   CONFIG_VNODES=263168		# <medium>
options   CONFIG_VNODES=10240		# <small>
options   CONFIG_VNODES=750		# <bsmall>

options   CONFIG_NC_HASH=5120		# <large,xlarge>
options   CONFIG_NC_HASH=4096		# <medium>
options   CONFIG_NC_HASH=2048		# <small,xsmall>
options   CONFIG_NC_HASH=1024		# <bsmall>

options   CONFIG_VFS_NAMES=5120		# <large,xlarge>
options   CONFIG_VFS_NAMES=4096		# <medium>
options   CONFIG_VFS_NAMES=3072		# <small,xsmall>
options   CONFIG_VFS_NAMES=2048		# <bsmall>

options   CONFIG_MAX_CLUSTERS=8		# <xlarge,large,medium>
options   CONFIG_MAX_CLUSTERS=4		# <small,xsmall,bsmall>

#
#  configurable options for minumum number of buffers for kernel memory
#
options   CONFIG_MIN_NBUF=256		# <medium,large,xlarge>
options   CONFIG_MIN_NBUF=128		# <small>
options   CONFIG_MIN_NBUF=80		# <xsmall>
options   CONFIG_MIN_NBUF=64		# <bsmall>

options   CONFIG_MIN_NIOBUF=128		# <medium,large,xlarge>
options   CONFIG_MIN_NIOBUF=64		# <xsmall,small>
options   CONFIG_MIN_NIOBUF=32		# <bsmall>

#
# set maximum space used for packet buffers
#
options        CONFIG_NMBCLUSTERS="((1024 * 1024) / MCLBYTES)"	# <large,xlarge>
options        CONFIG_NMBCLUSTERS="((1024 * 512) / MCLBYTES)"	# <medium>
options        CONFIG_NMBCLUSTERS="((1024 * 256) / MCLBYTES)"	# <bsmall,xsmall,small>

#
# Configure size of TCP hash table
#
options CONFIG_TCBHASHSIZE=4096		# <medium,large,xlarge>
options CONFIG_TCBHASHSIZE=128		# <xsmall,small,bsmall>

#
#  configurable async IO options
#  CONFIG_AIO_MAX - system wide limit of async IO requests.
#  CONFIG_AIO_PROCESS_MAX - process limit of async IO requests.
#  CONFIG_AIO_THREAD_COUNT - number of async IO worker threads created.
#
options   CONFIG_AIO_MAX=360			# <xlarge>
options   CONFIG_AIO_MAX=180			# <large>
options   CONFIG_AIO_MAX=90			# <medium>
options   CONFIG_AIO_MAX=45			# <small>
options   CONFIG_AIO_MAX=20			# <xsmall>
options   CONFIG_AIO_MAX=10			# <bsmall>

options   CONFIG_AIO_PROCESS_MAX=64		# <xlarge>
options   CONFIG_AIO_PROCESS_MAX=32		# <large>
options   CONFIG_AIO_PROCESS_MAX=16		# <medium>
options   CONFIG_AIO_PROCESS_MAX=12		# <small>
options   CONFIG_AIO_PROCESS_MAX=8		# <xsmall>
options   CONFIG_AIO_PROCESS_MAX=4		# <bsmall>

options   CONFIG_AIO_THREAD_COUNT=16		# <xlarge>
options   CONFIG_AIO_THREAD_COUNT=8		# <large>
options   CONFIG_AIO_THREAD_COUNT=4		# <medium>
options   CONFIG_AIO_THREAD_COUNT=3		# <small>
options   CONFIG_AIO_THREAD_COUNT=2		# <xsmall,bsmall>

options   CONFIG_MAXVIFS=32			# <medium,large,xlarge>
options   CONFIG_MAXVIFS=16			# <small,xsmall>
options   CONFIG_MAXVIFS=2			# <bsmall>

options   CONFIG_MFCTBLSIZ=256			# <medium,large,xlarge>
options   CONFIG_MFCTBLSIZ=128			# <small,xsmall>
options   CONFIG_MFCTBLSIZ=16			# <bsmall>

#
# configurable kernel message buffer size
#
options   CONFIG_MSG_BSIZE_REL=16384		# <msgb_small>
options   CONFIG_MSG_BSIZE_DEV=131072		# <msgb_small>
options   CONFIG_MSG_BSIZE_REL=131072		# <msgb_large>
options   CONFIG_MSG_BSIZE_DEV=131072		# <msgb_large>
options   CONFIG_MSG_BSIZE=CONFIG_MSG_BSIZE_REL	# <!development,debug>
options   CONFIG_MSG_BSIZE=CONFIG_MSG_BSIZE_DEV	# <development,debug>

#
# maximum size of the per-process Mach IPC table
#
options   CONFIG_IPC_TABLE_ENTRIES_SIZE_MAX=3145728  	# 3M == 131072 entries	# <bsmall,small,xsmall>
options   CONFIG_IPC_TABLE_ENTRIES_SIZE_MAX=7340032 	# 7M == 305834 entries	# <medium,large,xlarge>
options   CONFIG_IPC_TABLE_REQUEST_SIZE_MAX=1048576 	# 1M == 65536 requests	# <bsmall,small,xsmall>
options   CONFIG_IPC_TABLE_REQUEST_SIZE_MAX=2097152 	# 2M == 131072 requests	# <medium,large,xlarge>

#
# maximum copyout size for IPC debugging tools
#
options CONFIG_IPC_KERNEL_MAP_SIZE=32	# 32M	# <bsmall,small,xsmall>
options CONFIG_IPC_KERNEL_MAP_SIZE=64	# 64M	# <medium,large,xlarge>

#
#  configurable kernel - use these options to strip strings from panic
#  and printf calls.
#  no_printf_str - saves around 45K of kernel footprint.
#
options   CONFIG_NO_PRINTF_STRINGS		# <no_printf_str>
options   CONFIG_NO_KPRINTF_STRINGS		# <no_kprintf_str>

# support vsprintf (deprecated in favor of vsnprintf)
options   CONFIG_VSPRINTF               # <vsprintf>

#
# configurable kernel - general switch to say we are building for an
# embedded device
#
options   CONFIG_EMBEDDED			# <config_embedded>


# Compile XNU with SPTM support. This option should be used mutually exclusively
# with the config_pmap_ppl option
options   CONFIG_SPTM				# <config_sptm>


# Enable support for commmunication with exclaves. Requires SPTM support.
options		CONFIG_EXCLAVES			# <config_exclaves>

# Compile XNU with PPL support.
options   CONFIG_PMAP_PPL			# <config_pmap_ppl>

options   NOS_ARM_ASM			# <nos_arm_asm>
options   NOS_ARM_PMAP			# <nos_arm_pmap>

# support dynamic signing of code
#
options		CONFIG_DYNAMIC_CODE_SIGNING	# <dynamic_codesigning>

# enforce library validation on all processes.
#
options		CONFIG_ENFORCE_LIBRARY_VALIDATION  # <config_library_validation>

# support loading a second static trust cache
#
options CONFIG_SECOND_STATIC_TRUST_CACHE # <second_static_trust_cache>

# support supplemental signatures
#
options CONFIG_SUPPLEMENTAL_SIGNATURES # <config_supplemental_signatures>

#
# code decryption... used on embedded for app protection, DSMOS on desktop
#
options		CONFIG_CODE_DECRYPTION		# <config_code_decryption>

#
# User Content Protection, used on embedded
#
options		CONFIG_PROTECT			# <config_protect>

#allow write-protection of key page
options		CONFIG_KEYPAGE_WP		# <config_keypage_wp>

#
# allow vm_pageout_scan to dynamically adjust its priority based on priorities of waiters
#
options		CONFIG_VPS_DYNAMIC_PRIO		# <vps_dynamic_prio>

#
# enable per-process memory priority tracking
#
options		CONFIG_MEMORYSTATUS		# <memorystatus>

options		CONFIG_DEFERRED_RECLAIM		# <config_deferred_reclaim>

#
# enable jetsam - used on embedded
#
options		CONFIG_JETSAM			# <jetsam>

#
# enable new wait queue implementation stats / debugging
#
options		CONFIG_WAITQ_STATS			# <config_waitq_stats>

#
# enable freezing of suspended processes - used on embedded
#
options		CONFIG_FREEZE			# <freeze>

options		CHECK_CS_VALIDATION_BITMAP	# <config_cs_validation_bitmap>

#
# enable physical writes accounting
#
options		CONFIG_PHYS_WRITE_ACCT		# <phys_write_acct>

#
# enable detection of file cache thrashing - used on platforms with
# dynamic VM compression enabled
#
options		CONFIG_PHANTOM_CACHE		# <phantom_cache>

#
# enable detection of anonymous pages staying unmodified after first use
# - used on platforms with dynamic VM compression enabled
#
options		CONFIG_TRACK_UNMODIFIED_ANON_PAGES		# <track_unmodified_anon_pages>

#
# memory pressure event support
#
options		VM_PRESSURE_EVENTS		# <vm_pressure_events>

options		CONFIG_SECLUDED_MEMORY		# <config_secluded_memory>

#
# Ledger features
#
options		CONFIG_LEDGER_INTERVAL_MAX	# <config_ledger_interval_max>

#
# I/O Scheduling
#
options		CONFIG_IOSCHED			# <config_iosched>

#
# Accounting for I/O usage
#
options 	CONFIG_IO_ACCOUNTING 		# <config_io_accounting>

#
# Enable inheritance of importance through specially marked mach ports and for file locks
# For now debug is enabled wherever inheritance is
#
options		IMPORTANCE_INHERITANCE		# <importance_inheritance>
options		IMPORTANCE_TRACE		# <importance_trace>
options		IMPORTANCE_DEBUG		# <importance_debug>

options		CONFIG_TELEMETRY		# <config_telemetry>

options		CONFIG_PROC_UUID_POLICY		# <config_proc_uuid_policy>

#
# ECC data logging
#
options		CONFIG_ECC_LOGGING		# <config_ecc_logging>

#
# Application core dumps
#
options		CONFIG_COREDUMP			# <config_coredump>

#
# Vnode guards
#
options		CONFIG_VNGUARD			# <config_vnguard>

#
# Paravirtualization
#
options		CONFIG_PV_TICKET		# <config_pv_ticket>

#
# Enable extended VM address space and user heap segregation
#
options     CONFIG_MAP_RANGES       # <config_map_ranges>

#
#  Ethernet (ARP)
#
pseudo-device	ether				# <networking,inet>
#
#  Network loopback device
#
pseudo-device	loop				# <networking,inet>
#
#  UCB pseudo terminal service
#
pseudo-device  pty     512 init pty_init       # <xlarge>
pseudo-device  pty     256 init pty_init       # <large>
pseudo-device  pty     128 init pty_init       # <medium>
pseudo-device  pty      48 init pty_init       # <small>
pseudo-device  pty      16 init pty_init       # <xsmall>
pseudo-device  pty       8 init pty_init       # <bsmall>
#
# Cloning pseudo terminal service
#
pseudo-device	ptmx	1 init ptmx_init

#
# memory device
pseudo-device	mdevdevice	1	init	mdevinit

#
#
# packet filter device
#
pseudo-device	bpfilter	4	init	bpf_init		# <networking,inet>

#
# fsevents device
pseudo-device	fsevents	1	init	fsevents_init	# <config_fse>

pseudo-device	random		1	init	random_init
pseudo-device	dtrace		1	init	dtrace_init	# <config_dtrace>
pseudo-device	helper		1	init	helper_init	# <config_dtrace>
pseudo-device	lockstat	1	init	lockstat_init	# <config_dtrace>
pseudo-device	lockprof	1	init	lockprof_init	# <config_dtrace>
pseudo-device	sdt		1	init	sdt_init	# <config_dtrace>
pseudo-device	systrace	1	init	systrace_init	# <config_dtrace>
pseudo-device	fbt		1	init	fbt_init	# <config_dtrace>
pseudo-device	profile_prvd	1	init	profile_init	# <config_dtrace>

# monotonic devices
pseudo-device monotonic 1 init mt_dev_init # <config_cpu_counters>

#
# IOKit configuration options
#

options		HIBERNATION	# system hibernation	# <hibernation>
options		IOKITCPP	# C++ implementation	# <iokitcpp>
options		IOKITSTATS	# IOKit statistics	# <iokitstats>
options		IOTRACKING	# IOKit tracking	# <iotracking>
options		CONFIG_SLEEP	#			# <config_sleep>
options		CONFIG_MAX_THREADS=500	# IOConfigThread threads
options         NO_KEXTD                		# <no_kextd>
options         NO_KERNEL_HID           		# <no_kernel_hid>

#
# Libkern configuration options
#

options		LIBKERNCPP		# C++ implementation	# <libkerncpp>
options		CONFIG_BLOCKS		# Blocks runtime	# <config_blocks>
options		CONFIG_KXLD		# kxld/runtime linking of kexts # <config_kxld>
options		CONFIG_KEC_FIPS		# Kernel External Components for FIPS compliance (KEC_FIPS) # <config_kec_fips>

# Note that when adding this config option to an architecture, one MUST
# add the architecture to the preprocessor test at the beginning of
# libkern/kmod/cplus_{start.c,stop.c}.
options         CONFIG_STATIC_CPPINIT   # Static library initializes kext cpp runtime # <config_static_cppinit>

#
# libsa configuration options
#

# CONFIG_KEXT_BASEMENT - alloc post boot loaded kexts after prelinked kexts
#
options		CONFIG_KEXT_BASEMENT		#	# <config_kext_basement>

#
# Persona Management
#
options		CONFIG_PERSONAS	    # Persona management    # <config_personas>
options		PERSONA_DEBUG	    # Persona debugging     # <persona_debug>

#
# security configuration options
#

options		CONFIG_MACF	# Mandatory Access Control Framework	# <config_macf>
options		CONFIG_MACF_SOCKET_SUBSET	# MAC socket subest (no labels)	# <config_macf>
#options	CONFIG_MACF_DEBUG   # debug	    	    # <config_macf>

options		CONFIG_AUDIT	    # Kernel auditing	    # <config_audit>

options		CONFIG_ARCADE		# Arcade validation support	# <config_arcade>

options		CONFIG_SETUID		# setuid/setgid support # <config_setuid>

options		CONFIG_SECURE_BSD_ROOT	# secure BSD root	# <config_secure_bsd_root>

options		CONFIG_KAS_INFO		# kas_info support	# <config_kas_info>

options		CONFIG_PROC_RESOURCE_LIMITS	# Per process limits for resources like file descriptors and mach ports  # <config_proc_resource_limits>

#
# MACH configuration options.
#

#
# This defines configuration options that are normally used only during
# kernel code development and debugging. They add run-time error checks or
# statistics gathering, which will slow down the system
#
##########################################################
#
# MACH_ASSERT controls the assert() and ASSERT() macros, used to verify the
#	consistency of various algorithms in the kernel. The performance impact
#	of this option is significant.
#
options		MACH_ASSERT	#		# <mach_assert>
options		MACH_VM_DEBUG	#				# <debug>
options		CONFIG_ZLEAKS	# Live zone leak debugging	# <zleaks>
options		CONFIG_VOUCHER_DEPRECATED # Enable deprecated voucher managers # <config_voucher_deprecated>

#
# CONFIG_DEBUGGER_FOR_ZONE_INFO restricts zone info so that it is only
# available when the kernel is being debugged.
#
options		CONFIG_DEBUGGER_FOR_ZONE_INFO	# <debugger_for_zone_info>
#
# MACH_LDEBUG controls the internal consistency checks and
#	data gathering in the locking package. This also enables a debug-only
#	version of simple-locks on uniprocessor machines. The code size and
#	performance impact of this option is significant.
#
options		MACH_LDEBUG	#		# <debug>

#
# configuration option for full, partial, or no kernel debug event tracing
#
options		KDEBUG			# kernel tracing	# <kdebug>
options		IST_KDEBUG		# limited tracing	# <ist_kdebug>
options		NO_KDEBUG       	# no kernel tracing 	# <no_kdebug>

#
# CONFIG_DTRACE enables code needed to support DTrace. Currently this is
# only used for delivery of traps/interrupts to DTrace.
#
options		CONFIG_DTRACE		#		    # <config_dtrace>

options		LOCK_STATS		#		    # <lock_stats>

# kernel performance tracing
options     KPERF                  # <kperf>

options     CONFIG_CPU_COUNTERS     # <config_cpu_counters>

options     CONFIG_PERVASIVE_CPI    # <config_pervasive_cpi>
options     CONFIG_PERVASIVE_ENERGY # <config_pervasive_energy>

options     CONFIG_IOTRACE          # Physical IO tracing    # <config_iotrace>

options     PGO                    # <pgo>

# DEVELOPMENT define for development builds
options		DEVELOPMENT	# dev kernel	    	    # <development>

# DEBUG kernel
options		DEBUG		# general debugging code    # <debug>

options		MACH_BSD	# BSD subsystem on top of Mach	# <mach_bsd>
options         IOKIT		#				# <iokit>

#
#  configurable kernel related resources (CONFIG_THREAD_MAX needs to stay in
#  sync with bsd/conf/MASTER until we fix the config system... todo XXX
#
options   CONFIG_THREAD_MAX=2560		# <medium,large,xlarge>
options   CONFIG_THREAD_MAX=1536		# <small,xsmall>
options   CONFIG_THREAD_MAX=1024		# <bsmall>

options   CONFIG_TASK_MAX=1024			# <medium,large,xlarge>
options   CONFIG_TASK_MAX=768			# <small,>
options   CONFIG_TASK_MAX=512			# <xsmall,bsmall>

#
# Minimum zone map size: 115 MB
#
options   CONFIG_ZONE_MAP_MIN=120586240	# <xsmall,bsmall,small,medium,large,xlarge>

# vc_progress_white - make the progress gear white instead of black
options	  CONFIG_VC_PROGRESS_WHITE		# <vc_progress_white>

#
# Timeshare scheduler implementations
#
options		CONFIG_SCHED_TIMESHARE_CORE	# <config_sched_timeshare_core>
options		CONFIG_CLUTCH				# <config_clutch>
options 	CONFIG_SCHED_AUTO_JOIN		# <config_sched_auto_join>
options 	CONFIG_SCHED_RT_ALLOW		# <config_sched_rt_allow>

options		CONFIG_SCHED_IDLE_IN_PLACE	# <config_sched_idle_in_place>
options		CONFIG_SCHED_SFI		# <config_sched_sfi>
options		CONFIG_PROB_GZALLOC		# <pgzalloc>
options		CONFIG_SCHED_DEFERRED_AST	# <config_sched_deferred_ast>

options		CONFIG_PREADOPT_TG			# <config_preadopt_tg>
options		CONFIG_PREADOPT_TG_DEBUG	# <config_preadopt_tg_debug>

options     CONFIG_SCHED_SMT            # <config_sched_smt>

# This is overridden by the board configuration's HAS_FAST_CNTVCT.
options	    CONFIG_SKIP_PRECISE_USER_KERNEL_TIME    # <config_skip_precise_user_kernel_time>

#
# Switch to disable cpu, wakeup and high memory watermark monitors
#
options 	CONFIG_NOMONITORS			# <config_nomonitors>

options		MACH_KDP	    # KDP		# <mach_kdp>
options		CONFIG_SERIAL_KDP   # KDP over serial	# <config_serial_kdp>
options		CONFIG_KDP_INTERACTIVE_DEBUGGING	# <kdp_interactive_debugging>
options		CONFIG_KDP_COREDUMP_ENCRYPTION	# Support for encrypting kernel coredumps	# <config_kdp_coredump_encryption>

options 	CONFIG_TASKWATCH
options 	CONFIG_USER_NOTIFICATION		# <config_user_notification>
#
# Kernel Power On Self Tests
#
options		CONFIG_XNUPOST				# <config_xnupost>

#
# Kernel proc reference instrumentation
#
options PROC_REF_DEBUG					# <proc_ref_debug>

#
# Kernel Voucher Attr Manager for Activity Trace
#
options 	CONFIG_ATM				# <config_atm>

# Group related tasks together into coalitions
options		CONFIG_COALITIONS			# <config_coalitions>

# Enable support for sysdiagnose notifications
options		CONFIG_SYSDIAGNOSE			# <config_sysdiagnose>

# Configurable Security Restrictions
options		CONFIG_CSR				# <config_csr>
options		CONFIG_CSR_FROM_DT		# <config_csr_from_dt>

# Enable collection of IO Compression statistics
options		CONFIG_IO_COMPRESSION_STATS		# <config_io_compression_stats>

#
# Console options
#
options		SERIAL_CONSOLE	# bi-directional serial over UART
options		VIDEO_CONSOLE	# uni-directional output over framebuffer

#
# Syscall options
#
options		CONFIG_REQUIRES_U32_MUNGING	# incoming U32 argument structures must be munged to match U64	# <config_requires_u32_munging>

#
# copyout() instrumentation
#
options		COPYOUT_SHIM			# Shim for copyout memory analysis via kext #<copyout_shim>

#
# Enable hardware correlation of mach absolute time
# across intel/arm boundary
options		CONFIG_MACH_BRIDGE_SEND_TIME #  # <config_mach_bridge_send_time>
options		CONFIG_MACH_BRIDGE_RECV_TIME #  # <config_mach_bridge_recv_time>

options		CONFIG_QUIESCE_COUNTER # Support for _COMM_PAGE_CPU_QUIESCENT_COUNTER # <config_quiesce_counter>
options		CONFIG_ARM_PFZ	# Support for PFZ on ARM # <config_arm_pfz>

#
# Sanitizers
#
options		CONFIG_KASAN		# <config_kasan>
options		CONFIG_UBSAN		# <config_ubsan>

options		CONFIG_KCOV			# <config_kcov>
options		CONFIG_KSANCOV		# <config_ksancov>
options		CONFIG_STKSZ		# <config_stksz>

# dark boot support
options		CONFIG_DARKBOOT		# <config_darkboot>

# support for tracking service port labels for stackshots/debugging
options		CONFIG_SERVICE_PORT_INFO # <config_service_port_info>

# support for processes delaying idle sleep for pending IO
options		CONFIG_DELAY_IDLE_SLEEP # <config_delay_idle_sleep>

# support for storing a 64-bit user supplied value in the proc structure
options		CONFIG_PROC_UDATA_STORAGE # <config_proc_udata_storage>

pseudo-device ksancov 1 init ksancov_init_dev # <config_ksancov>

# Debug instrumentation for statistics and catching of code that
# leaves interrupts masked or preemption disabled for an excessive
# period of time.
options		SCHED_HYGIENE_DEBUG # <sched_hygiene_debug>

# support for system call rejection/tracing
options		CONFIG_DEBUG_SYSCALL_REJECTION	# <config_debug_syscall_rejection>

# Extensible panic log support
options		CONFIG_EXT_PANICLOG		# <config_ext_paniclog>

# support for collecting statistics on task suspension
options		CONFIG_TASK_SUSPEND_STATS	# <config_task_suspend_stats>

# Support for non-fatal Branch Target Identification exception reporting and logging
options		CONFIG_BTI_TELEMETRY   # <config_bti_telemetry>