xnu-3789.31.2.tar.gz

[apple/xnu.git] / config / MASTER

#
# Mach Operating System
# Copyright (c) 1986 Carnegie-Mellon University
# Copyright 2001-2014 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         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_ALTQ         # PF ALTQ (Alternate Queueing)  # <pf_altq>
options         PF_ECN          # PF use ECN marking            # <pf_ecn>
options         PFLOG           # PF log interface              # <pflog>
options         PKTSCHED_CBQ    # CBQ packet scheduler          # <pktsched_cbq>
options         PKTSCHED_HFSC   # H-FSC packet scheduler        # <pktsched_hfsc>
options         PKTSCHED_PRIQ   # PRIQ packet scheduler         # <pktsched_priq>
options         PKTSCHED_FAIRQ  # FAIRQ packet scheduler        # <pktsched_fairq>
options         MEASURE_BW      # interface bandwidth measurement # <measure_bw>
options         CLASSQ_BLUE     # BLUE queueing algorithm       # <classq_blue>
options         CLASSQ_RED      # RED queueing algorithm        # <classq_red>
options         CLASSQ_RIO      # RIO queueing algorithm        # <classq_rio>
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>

#
#       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>

#
# 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         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_VNODE_FREE_MIN - mininmum number of free vnodes 
#  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_VNODE_FREE_MIN=500     # <large,xlarge>
options   CONFIG_VNODE_FREE_MIN=300     # <medium>
options   CONFIG_VNODE_FREE_MIN=200     # <small>
options   CONFIG_VNODE_FREE_MIN=100     # <xsmall>
options   CONFIG_VNODE_FREE_MIN=75      # <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=4096                 # <bsmall,small,xsmall>
options   CONFIG_MSG_BSIZE=16384                # <medium,large,xlarge>

#
# 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_panic_str - saves around 50K of kernel footprint.
#  no_printf_str - saves around 45K of kernel footprint.
#
options   CONFIG_NO_PANIC_STRINGS               # <no_panic_str>
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>


# 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>

#
# 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>

#
# 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_DEBUG                # <importance_inheritance>

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>

#
#  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_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         MACH_RT
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_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>

# 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>

#
# Kernel Voucher Attr Manager for BANK
#
options         CONFIG_BANK                             # <config_bank>


# 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>