config/MASTER

#
# 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		HW_AST		# Hardware ast support		# <hw_ast>
options 	HW_FOOTPRINT	# Cache footprint support	# <hw_foot>

options 	MACH		# Standard Mach features	# <mach>
options		MACH_COMPAT	# Vendor syscall compatibility  # <mach>
options		MACH_FASTLINK	# Fast symbolic links
options		MACH_HOST	# Mach host (resource alloc.)	# <host>
options		MACH_IPC_COMPAT	# Enable old IPC interface	# <ipc_compat>
options		MACH_IPC_TEST	# Testing code/printfs		# <ipc_test>
options		MACH_FLIPC	# Fast-Local IPC		# <mach_flipc>
options 	MACH_NP		# Mach IPC support		# <np>
options		MACH_NBC	# No buffer cache		# <nbc>
options		MACH_NET	# Fast network access		# <mach_net>
options		MACH_XP		# external pager support	# <xp>
options		NO_DIRECT_RPC	# for untyped mig servers	# 
options		LOOP		# loopback support		# <loop>
options		VLAN		#				# <vlan>
options		BOND		#				# <bond>
options		IF_FAKE		#				# <if_fake>
options		AH_ALL_CRYPTO	# AH all crypto algs		# <ah_all_crypto>
options		IPCOMP_ZLIB	# IP compression using zlib	# <ipcomp_zlib>
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		TCPDEBUG	# TCP debug			# <tcpdebug>
options		TCP_DROP_SYNFIN	# Drop TCP packets with SYN+FIN set	# <tcpdrop_synfin>
options		ICMP_BANDLIM	# ICMP bandwidth limiting sysctl
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>

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

options     OLD_SEMWAIT_SIGNAL  # old semwait_signal handler

#
#	4.4 general kernel 
#
options		SOCKETS		# socket support		# <inet, inet6>
options 	DIAGNOSTIC	# diagnostics			# <diagnostic>
options		GPROF		# build profiling		# <profile>
options		PROFILE		# kernel profiling		# <profile>
options		SENDFILE	# sendfile					# <sendfile>
options		NETWORKING	# networking layer		# <inet, inet6>
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_WORKQUEUE	# <config_workqueue>
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		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>

#
# NFS support
#
options		NFSCLIENT	# Be an NFS client		# <nfsclient>
options		NFSSERVER	# Be an NFS server		# <nfsserver>

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

#       
# IPv6 Support
#       
options         "INET6"         # kernel IPv6 Support           # <inet6>
options         IPV6SEND	# Secure Neighbor Discovery	# <ipv6send>
options         IPSEC           # IP security            	# <ipsec>
options         IPSEC_ESP       # IP security            	# <ipsec>
options         "IPV6FIREWALL"  # IPv6 Firewall Feature   	# <ipv6firewall>
options         "IPV6FIREWALL_DEFAULT_TO_ACCEPT"	#IPv6 Firewall Feature   	# <ipv6firewall>
#options         "IPV6FIREWALL_VERBOSE" 		#IPv6 Firewall Feature   	# <ipv6firewall>

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		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>

#
# Configure bandwidth limiting sysctl
#
options CONFIG_ICMP_BANDLIM=250		# <medium,large,xlarge>
options CONFIG_ICMP_BANDLIM=50		# <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=4096		# <bsmall,small,xsmall>
options   CONFIG_MSG_BSIZE_DEV=4096		# <bsmall,small,xsmall>
options   CONFIG_MSG_BSIZE_REL=16384		# <medium,large,xlarge>
options   CONFIG_MSG_BSIZE_DEV=131072		# <medium,large,xlarge>
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_STEPS=64  	# 137898 entries	# <bsmall,small,xsmall>
options   CONFIG_IPC_TABLE_ENTRIES_STEPS=256 	# 300714 entries	# <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>

#
# use finer-grained lock groups for the proc subsystem
#
options   CONFIG_FINE_LOCK_GROUPS               # <medium,large,xlarge>

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


# 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>

#
# 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>

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

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

#
# enable new link table implementation stats/debugging
# (adds mesaureable overhead)
#
options		CONFIG_LTABLE_STATS			# <config_ltable_stats>
options		CONFIG_LTABLE_DEBUG			# <config_ltable_debug>

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

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

options		CHECK_CS_VALIDATION_BITMAP	# <config_cs_validation_bitmap>

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

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

options		CONFIG_SECLUDED_MEMORY		# <config_secluded_memory>

options		CONFIG_BACKGROUND_QUEUE		# <config_background_queue>

#
# 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>

#
#  Ethernet (ARP)
#
pseudo-device	ether				# <networking,inet,inet6>
#
#  Network loopback device
#
pseudo-device	loop				# <networking,inet,inet6>
#
#  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

#
# vnode device
#
pseudo-device  vndevice		4       init    vndevice_init   # <development,debug>

#
# memory device
pseudo-device	mdevdevice	1	init	mdevinit

#
#
# packet filter device
#
pseudo-device	bpfilter	4	init	bpf_init		# <networking,inet,inet6>

#
# 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	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>


#
# 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=64	# 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_SOCKET  # MAC socket labels	    # <config_macf>
#options	CONFIG_MACF_NET	    # mbuf	    	    # <config_macf>
#options	CONFIG_MACF_DEBUG   # debug	    	    # <config_macf>

options		CONFIG_AUDIT	    # Kernel auditing	    # <config_audit>


#
# MACH configuration options.
#
# TASK_SWAPPER enables code that manages demand for physical memory by
#	forcibly suspending tasks when the demand exceeds supply. This
#	option should be on.
#
options		TASK_SWAPPER	#	<task_swapper_disabled>

#
# 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>
#
# MACH_DEBUG enables the mach_debug_server, a message interface used to
#	retrieve or control various statistics. This interface may expose data
#	structures that would not normally be allowed outside the kernel, and
#	MUST NOT be enabled on a released configuration.
#	Other options here enable information retrieval for specific subsystems
#
options		MACH_DEBUG	# IPC debugging interface	# <mdebug>
options		MACH_IPC_DEBUG	# Enable IPC debugging calls	# <ipc_debug>
options		MACH_VM_DEBUG	#				# <debug>
#
# MACH_MP_DEBUG control the possible dead locks that may occur by controlling
#	that IPL level has been raised down to SPL0 after some calls to
#	hardclock device driver.
#
options		MACH_MP_DEBUG	#				# <debug>
#
# ZONE_DEBUG keeps track of all zalloc()ed elements to perform further
#	operations on each element.
#
options		ZONE_DEBUG	#		# <debug>
options		CONFIG_ZCACHE 	#Enable per-cpu caching for zones	# <config_zcache>
options		CONFIG_ZLEAKS	# Live zone leak debugging	# <zleaks>

#
# CONFIG_TASK_ZONE_INFO allows per-task zone information to be extracted
# Primarily useful for xnu debug and development.
#
options		CONFIG_TASK_ZONE_INFO		# <task_zone_info>
#
# 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>
# 
# XPR_DEBUG enables the gathering of data through the XPR macros inserted
#	into various subsystems. This option is normally only enabled for
#	specific performance or behavior studies, as the overhead in both
#	code and data space is large. The data is normally retrieved through
#	the kernel debugger (kdb) or by reading /dev/kmem.
#	
options		XPR_DEBUG	#		# <debug>
# 
# 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>

# kernel performance tracing
options     KPERF                  # <kperf>
options     KPC                    # <kpc>


options     PGO                    # <pgo>

# MACH_COUNTERS enables code that handles various counters in the system.
# 
options		MACH_COUNTERS	#			    # <debug>

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

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

##########################################################
#
# This defines configuration options that are normally used only during
# kernel code development and performance characterization. They add run-time
# statistics gathering, which will slow down the system,
#
##########################################################
#
# MACH_IPC_STATS controls the collection of statistics in the MACH IPC
#	subsystem.
#
#options	MACH_IPC_STATS
#
# MACH_CLUSTER_STATS controls the collection of various statistics concerning
#	the effectiveness and behavior of the clustered pageout and pagein
#	code.
#
#options	MACH_CLUSTER_STATS

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>

options   CONFIG_ZONE_MAP_MIN=12582912	# <medium,large,xlarge>
options   CONFIG_ZONE_MAP_MIN=6291456	# <small>
options   CONFIG_ZONE_MAP_MIN=1048576	# <xsmall,bsmall>

# Sizes must be a power of two for the zhash to 
# be able to just mask off bits instead of mod 
options	  CONFIG_ZLEAK_ALLOCATION_MAP_NUM=16384 #<medium,large,xlarge>
options	  CONFIG_ZLEAK_ALLOCATION_MAP_NUM=8192	#<small,xsmall,bsmall>
options   CONFIG_ZLEAK_TRACE_MAP_NUM=8192 #<medium,large,xlarge>
options   CONFIG_ZLEAK_TRACE_MAP_NUM=4096 #<small,xsmall,bsmall>

# 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_TRADITIONAL	# <config_sched_traditional>
options		CONFIG_SCHED_PROTO		# <config_sched_proto>
options		CONFIG_SCHED_GRRR		# <config_sched_grrr>
options		CONFIG_SCHED_GRRR_CORE		# <config_sched_grrr>
options		CONFIG_SCHED_MULTIQ		# <config_sched_multiq>
options		CONFIG_SCHED_TIMESHARE_CORE	# <config_sched_traditional,config_sched_multiq>

options		CONFIG_SCHED_IDLE_IN_PLACE	# <config_sched_idle_in_place>
options		CONFIG_SCHED_SFI		# <config_sched_sfi>
options		CONFIG_GZALLOC			# <config_gzalloc>
options		CONFIG_SCHED_DEFERRED_AST	# <config_sched_deferred_ast>

# Enable allocation of contiguous physical memory through vm_map_enter_cpm()
options		VM_CPM				# <vm_cpm>

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>

#
# Kernel Power On Self Tests
#
options		CONFIG_XNUPOST				# <config_xnupost>

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

#
# Kernel OS reason debug instrumentation
#
options OS_REASON_DEBUG					# <os_reason_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>

#
# 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>


#
# Telemetry for 32-bit process launch
#
options		CONFIG_32BIT_TELEMETRY # # <config_32bit_telemetry>

options		CONFIG_QUIESCE_COUNTER # Support for _COMM_PAGE_CPU_QUIESCENT_COUNTER # <config_quiesce_counter>