GENERIC32 revision 1.9
11.9Smrg# $NetBSD: GENERIC32,v 1.9 2000/11/19 15:22:51 mrg Exp $ 21.1Seeh 31.1Seehinclude "arch/sparc64/conf/std.sparc64" 41.1Seeh 51.9Smrg#ident "GENERIC-$Revision: 1.9 $" 61.1Seeh 71.8Seehmaxusers 64 81.1Seeh 91.1Seeh## System kernel configuration. See options(4) for more detail. 101.1Seeh 111.1Seeh 121.1Seeh# Options for variants of the Sun SPARC architecure. 131.1Seeh# We currently support three architecture types; at least one is required. 141.1Seehoptions SUN4U # sun4u - Ultra 140 and 170 151.1Seehoptions TRAPWIN 161.1Seehoptions __ELF__ # we use elf 171.1Seeh#options _LP64 # we're using a 64-bit compiler 181.1Seeh 191.1Seeh## System options specific to the sparc machine type 201.1Seeh 211.1Seeh## Use a faster console than the PROM's slow drawing routines. Not needed 221.1Seeh## for headless (no framebuffer) machines. 231.8Seeh# XXX borken on sparc64 241.1Seeh#options RASTERCONSOLE # fast rasterop console 251.1Seeh#options FONT_GALLANT12x22 # the console font 261.1Seeh#options FONT_BOLD8x16 # a somewhat smaller font 271.1Seeh 281.1Seeh#### System options that are the same for all ports 291.1Seeh 301.1Seeh## Root device configuration: change the ?'s if you are going to use a 311.1Seeh## nonstandard root partition (other than where the kernel is booted from) 321.1Seeh## and/or nonstandard root type (not ffs or nfs). Normally this can be 331.1Seeh## automagically determined at boot time. 341.1Seeh 351.1Seehconfig netbsd root on ? type ? 361.1Seeh 371.1Seeh## UVM options. 381.1Seeh#options UVM_PAGE_TRKOWN 391.1Seeh#options UVMHIST 401.1Seeh#options UVMHIST_PRINT # Loud! 411.1Seeh 421.1Seeh## System call tracing (see ktrace(1)). 431.1Seehoptions KTRACE 441.1Seeh 451.1Seeh## Collect statistics on kernel malloc's and free's. This does have a 461.1Seeh## significant performance hit on slower machines, so it is intended for 471.1Seeh## diagnostic use only. 481.1Seeh#options KMEMSTATS 491.1Seeh 501.1Seeh## System V compatible IPC subsystem. (msgctl(2), semctl(2), and shmctl(2)) 511.1Seehoptions SYSVMSG # System V message queues 521.1Seehoptions SYSVSEM # System V semaphores 531.1Seehoptions SYSVSHM # System V shared memory 541.1Seeh#options SHMMAXPGS=1024 # 1024 pages is the default 551.1Seeh 561.1Seeh## Loadable kernel module support; still under development. 571.1Seehoptions LKM 581.1Seeh 591.1Seeh## NFS boot options; default on sparc is the bootparam protocol 601.1Seehoptions NFS_BOOT_BOOTPARAM 611.1Seeh#options NFS_BOOT_BOOTP 621.1Seeh#options NFS_BOOT_DHCP 631.1Seeh 641.1Seeh#### Debugging options 651.1Seeh 661.1Seeh## The DDB in-kernel debugger runs at panic (unless DDB_ONPANIC=0), or at 671.1Seeh## serial console break or keyboard reset, where the PROM would normally 681.1Seeh## intercept. DDB_HISTORY_SIZE adds up/down arrow command history. 691.1Seeh# we enable DDB in GENERIC for now. 701.1Seehoptions DDB # kernel dynamic debugger 711.1Seehoptions DDB_HISTORY_SIZE=100 # enable history editing in DDB 721.1Seeh#options DDB_ONPANIC # see also sysctl(8): `ddb.onpanic' 731.1Seeh 741.1Seeh## You may also use gdb, on another computer connected to this machine over 751.1Seeh## a serial port. Both KGDBDEV and KGDBRATE should be specified; KGDBDEV is 761.1Seeh## a dev_t encoded device number of the serial port to use. 771.1Seeh## (0xc01 = ttya, 0xc02 = ttyb.) 781.1Seeh#options KGDB # support for kernel gdb 791.1Seeh#options KGDBDEV=0xc01 # kgdb device number (this sample is `ttyb') 801.1Seeh#options KGDBRATE=38400 # baud rate 811.1Seeh 821.1Seeh 831.1Seeh## Compile the kernel with debugging symbols (`netbsd.gdb' is the debug file), 841.1Seeh## such that gdb(1) can be used on a kernel coredump. 851.1Seeh 861.6Seeh#makeoptions DEBUG="-g" 871.1Seeh 881.1Seeh 891.1Seeh## Adds code to the kernel that does internal consistency checks, and will 901.1Seeh## cause the kernel to panic if corruption of internal data structures 911.1Seeh## is detected. 921.1Seeh#options DIAGNOSTIC # extra kernel sanity checking 931.1Seeh 941.1Seeh## Enable (possibly expensive) debugging code that may also display messages 951.1Seeh## on the system console 961.6Seeh#options DEBUG 971.1Seeh 981.1Seeh## Make SCSI error messages more verbose when explaining their meanings. 991.1Seehoptions SCSIVERBOSE 1001.1Seehoptions PCIVERBOSE 1011.1Seehoptions MIIVERBOSE # verbose PHY autoconfig messages 1021.1Seeh#options PCI_CONFIG_DUMP # verbosely dump PCI config space 1031.1Seeh 1041.1Seeh## `INSECURE' turns off the kernel security level (securelevel = 0 always). 1051.1Seeh## This allows writing to /dev/mem, loading kernel modules while multi-user, 1061.1Seeh## and other insecurities good only for development work. Do not use this 1071.1Seeh## option on a production machine. 1081.1Seeh#options INSECURE 1091.1Seeh 1101.1Seeh## Allow non-root users to grab /dev/console with programs such as xconsole. 1111.1Seeh## `xconsole' therefore does not need setuid root with this option enabled. 1121.1Seeh#options UCONSOLE 1131.1Seeh 1141.1Seeh## `FDSCRIPTS' allows non-readable but executable scripts by providing a 1151.1Seeh## pre-opened opaque file to the script interpreter. `SETUIDSCRIPTS', 1161.1Seeh## which implies FDSCRIPTS, allows scripts to be set-user-id using the same 1171.1Seeh## opaque file mechanism. Perl calls this "secure setuid scripts." 1181.1Seeh 1191.1Seeh#options FDSCRIPTS 1201.1Seeh#options SETUIDSCRIPTS 1211.1Seeh 1221.1Seeh## Options for compatibility with previous releases foreign system binaries. 1231.1Seeh## In the cases of COMPAT_SUNOS and COMPAT_SVR4, you may need to set up 1241.1Seeh## additional user-level utilities or system configuration files. See 1251.1Seeh## compat_sunos(8) and compat_svr4(8). 1261.1Seeh 1271.1Seehoptions COMPAT_43 # 4.3BSD system interfaces 1281.1Seehoptions COMPAT_10 # NetBSD 1.0 binary compatibility 1291.1Seehoptions COMPAT_11 # NetBSD 1.1 binary compatibility 1301.1Seehoptions COMPAT_12 # NetBSD 1.2 binary compatibility 1311.1Seehoptions COMPAT_13 # NetBSD 1.3 binary compatibility 1321.1Seehoptions COMPAT_14 # NetBSD 1.4 binary compatibility 1331.1Seehoptions COMPAT_SUNOS # SunOS 4.x binary compatibility 1341.1Seehoptions COMPAT_SVR4 # SunOS 5.x binary compatibility 1351.1Seeh#options COMPAT_NETBSD32 # NetBSD/sparc binary compatibility -- 64-bit only 1361.1Seehoptions EXEC_AOUT # execve(2) support for a.out binaries 1371.1Seehoptions EXEC_ELF32 # Exec module for SunOS 5.x binaries. 1381.1Seeh#options EXEC_ELF64 # Exec module for sparc64 & SunOs 5.x binaries. -- 64-bit only 1391.1Seeh#options SYSCALL_DEBUG 1401.1Seeh 1411.1Seeh## File systems. You probably need at least one of FFS or NFS. 1421.1Seehfile-system FFS # Berkeley Fast Filesystem 1431.1Seehfile-system NFS # Sun NFS-compatible filesystem client 1441.1Seehfile-system KERNFS # kernel data-structure filesystem 1451.1Seehfile-system NULLFS # NULL layered filesystem 1461.1Seehfile-system OVERLAY # overlay file system 1471.1Seehfile-system MFS # memory-based filesystem 1481.1Seehfile-system FDESC # user file descriptor filesystem 1491.1Seehfile-system UMAPFS # uid/gid remapping filesystem 1501.1Seehfile-system LFS # Log-based filesystem (still experimental) 1511.1Seehfile-system PORTAL # portal filesystem (still experimental) 1521.1Seehfile-system PROCFS # /proc 1531.1Seehfile-system CD9660 # ISO 9660 + Rock Ridge file system 1541.1Seehfile-system UNION # union file system 1551.1Seehfile-system MSDOSFS # MS-DOS FAT filesystem(s). 1561.1Seeh 1571.1Seeh## File system options. 1581.1Seehoptions NFSSERVER # Sun NFS-compatible filesystem server 1591.1Seehoptions QUOTA # FFS quotas 1601.1Seeh#options FFS_EI # FFS Endian Independent support 1611.1Seehoptions SOFTDEP # FFS soft updates support. 1621.1Seeh 1631.1Seeh## Network protocol support. In most environments, INET is required. 1641.1Seehoptions INET # IP (Internet Protocol) v4 1651.1Seehoptions INET6 # IPV6 1661.1Seeh#options IPSEC # IP security 1671.1Seeh#options IPSEC_ESP # IP security (encryption part; define w/IPSEC) 1681.1Seeh#options IPSEC_DEBUG # debug for IP security 1691.1Seehoptions TCP_COMPAT_42 # 4.2BSD IP implementation compatibility 1701.1Seeh#options GATEWAY # packet forwarding ("router switch") 1711.1Seehoptions MROUTING # packet forwarding of multicast packets 1721.1Seeh#options DIRECTED_BROADCAST # allow broadcasts through routers 1731.1Seehoptions NS # Xerox NS networking 1741.1Seeh#options NSIP # Xerox NS tunneling over IP 1751.1Seehoptions ISO,TPIP # OSI networking 1761.6Seehoptions EON # OSI tunneling over IP 1771.1Seeh#options CCITT,LLC,HDLC # X.25 packet switched protocol 1781.1Seehoptions NETATALK # AppleTalk (over Ethernet) protocol 1791.1Seehoptions NTP # Network Time Protocol in-kernel support 1801.1Seeh#options PPS_SYNC # Add serial line synchronization for NTP 1811.1Seehoptions PFIL_HOOKS # Add pfil(9) hooks, intended for custom LKMs. 1821.1Seehoptions IPFILTER_LOG # Add ipmon(8) logging for ipfilter device 1831.1Seehoptions PPP_BSDCOMP # Add BSD compression to ppp device 1841.1Seehoptions PPP_DEFLATE # Add deflate (libz) compression to ppp device 1851.1Seehoptions PPP_FILTER # Add active filters for ppp (via bpf) 1861.1Seeh 1871.1Seeh 1881.1Seeh#### Main bus and CPU .. all systems. 1891.1Seehmainbus0 at root 1901.1Seehcpu0 at mainbus0 1911.1Seeh 1921.1Seeh#### Bus types found on SPARC systems. 1931.1Seeh 1941.1Seehsbus0 at mainbus0 # Ultra 1 1951.1Seeh#upa0 at mainbus0 # Ultra 1E, Ultra 2, Ex0000 1961.3Smrgpsycho0 at mainbus0 # Darwin, Ultra5 1971.3Smrgpsycho* at mainbus0 # U2P 1981.3Smrgpci0 at psycho0 1991.1Seehpci* at psycho? 2001.1Seehpci* at simba? 2011.1Seehsimba* at pci? dev ? function ? # `APB' support. 2021.1Seehebus* at pci? # ebus devices 2031.1Seeh 2041.3Smrg# Ultra5/10/AXi 2051.3Smrgsimba0 at pci0 dev 1 function 0 2061.3Smrgpci1 at simba0 2071.3Smrgsimba1 at pci0 dev 1 function 1 2081.3Smrgpci2 at simba1 2091.3Smrg 2101.1Seeh#### Standard system devices -- all required for a given architecture 2111.1Seeh 2121.1Seeh## PROM console driver -- if all else fails 2131.1Seehpcons0 at mainbus0 # PROM console 2141.1Seeh 2151.1Seeh## Auxiliary system registers -- We use the OBP for power management 2161.1Seehauxio* at ebus? # auxio registers 2171.1Seehauxio* at sbus? slot ? offset ? # auxio registers 2181.1Seeh 2191.1Seeh# We also need: 2201.1Seehbpp* at sbus? slot ? offset ? # parallel port 2211.1Seehlpt* at ebus? # parallel port 2221.1Seeh 2231.1Seeh## Mostek clock found on 4/300, sun4c, sun4m and sun4u systems. 2241.1Seeh## The Mostek clock NVRAM is the "eeprom" on sun4/300 systems. 2251.1Seehclock* at sbus? slot ? offset ? 2261.1Seehclock* at ebus? 2271.1Seeh 2281.1Seeh## Timer chip found on 4/300, sun4c, sun4m and (some) sun4u systems. 2291.1Seehtimer* at mainbus0 # sun4c 2301.1Seeh 2311.1Seeh#### Serial port configuration 2321.1Seeh 2331.1Seeh## Zilog 8530 serial chips. Each has two-channels. 2341.1Seeh## zs0 is ttya and ttyb. zs1 is the keyboard and mouse. 2351.8Seehzs* at sbus? slot ? offset ? 2361.8Seehzstty* at zs? channel ? # ttya 2371.8Seehkbd0 at zstty? 2381.8Seehms0 at zstty? 2391.8Seeh 2401.8Seeh## Old scheme -- deprecated. 2411.8Seeh#zs at sbus? slot ? offset ? 2421.8Seeh#kbd0 at zs1 channel 0 # keyboard 2431.8Seeh#ms0 at zs1 channel 1 # mouse 2441.1Seeh 2451.1Seeh## PCI machines have serial ports: 2461.1Seeh## Siemens SAB82532 controller: ttya and ttyb (`su'; sab) 2471.1Seeh## Part of NS PC87332VLJ Super I/O controller: kbd/mouse (`se'; com) 2481.1Seeh 2491.1Seeh## These are two SAB82532 controllers 2501.8Seeh#sab0 at ebus? # ttya/ttyb 2511.8Seeh#sabtty0 at sab0 channel 0 # ttya 2521.8Seeh#sabtty1 at sab0 channel 1 # ttyb 2531.1Seeh 2541.9Smrg## Part of a PC87332VLJ 2551.8Seehcom* at ebus? # `com' driver for `su' 2561.8Seehkbd0 at com? # keyboard 2571.8Seehms0 at com? # mouse 2581.1Seeh 2591.1Seeh#### Disk controllers and disks 2601.1Seeh 2611.1Seeh## The following flags may be set for the NCR53c94 based esp driver: 2621.1Seeh## bits 0-7: disable disconnect/reselect for the corresponding target 2631.1Seeh## bits 8-15: disable synchronous negotiation for target [bit-8] 2641.1Seeh 2651.1Seeh## sun4u on-board SCSI, and FSBE/S SBus SCSI cards, an NCR53c94 or 2661.1Seeh## equivalent behind an LSI Logic DMA controller 2671.1Seeh 2681.8Seehdma* at sbus? slot ? offset ? # SBus 2691.8Seehesp* at dma? flags 0x0000 # SBus 2701.1Seeh 2711.1Seehscsibus* at esp? 2721.1Seeh 2731.1Seeh## Qlogic ISP SBus SCSI Card 2741.1Seehisp* at sbus? slot ? offset ? 2751.1Seehscsibus* at isp? 2761.1Seeh 2771.1Seeh## FAS support missing 2781.1Seeh#fas* at sbus? slot ? offset ? 2791.1Seeh#scsibus* at fas? 2801.1Seeh 2811.9Smrg## GLM support 2821.8Seehsiop* at pci? # 53C875 "glm" compatible 2831.1Seehscsibus* at siop? 2841.1Seeh 2851.1Seeh## These entries find devices on all SCSI busses and assign 2861.1Seeh## unit numbers dynamically. 2871.1Seehsd* at scsibus? target ? lun ? # SCSI disks 2881.1Seehst* at scsibus? target ? lun ? # SCSI tapes 2891.1Seehcd* at scsibus? target ? lun ? # SCSI CD-ROMs 2901.1Seehch* at scsibus? target ? lun ? # SCSI changer devices 2911.1Seehss* at scsibus? target ? lun ? # SCSI scanners 2921.1Seehuk* at scsibus? target ? lun ? # unknown SCSI 2931.1Seeh 2941.1Seeh# PCI IDE. 2951.1Seehpciide* at pci ? dev ? function ? flags 0x0000 2961.1Seehwd* at pciide? channel ? drive ? flags 0x0000 2971.1Seehatapibus* at pciide? channel ? 2981.1Seeh 2991.1Seehcd* at atapibus? drive ? flags 0x0000 # ATAPI CD-ROM drives 3001.1Seehsd* at atapibus? drive ? flags 0x0000 # ATAPI disk drives 3011.1Seehuk* at atapibus? drive ? flags 0x0000 # ATAPI unknown 3021.1Seeh 3031.1Seeh## Floppy controller and drive found on SPARCstations. 3041.1Seeh 3051.1Seeh# need share with the sparc, and everyone else. needs to use auxio. 3061.1Seeh# actually, the ebus version has (will have) direct access to it's AUXIO 3071.1Seeh# register space (it is mapped in to fdthree not auxio). 3081.1Seeh#fdc0 at sbus? slot ? offset ? # SUNW,fdtwo 3091.1Seeh#fdc0 at ebus? # fdthree 3101.1Seeh#fd* at fdc0 # the drive itself 3111.1Seeh 3121.1Seeh## A disk-like interface to files. Can be used to create floppy, CD, 3131.1Seeh## miniroot images, etc. 3141.1Seeh 3151.1Seehpseudo-device vnd 4 3161.1Seeh 3171.1Seeh## Concatenated and striped disks; with this, you can create a software-based 3181.1Seeh## disk array similar to a "RAID 0" setup. See ccd(4). 3191.1Seeh 3201.1Seehpseudo-device ccd 4 3211.1Seeh 3221.1Seeh## RAIDframe disk driver: software RAID driver. See raid(4). 3231.1Seeh 3241.1Seehpseudo-device raid 4 3251.1Seeh#options RAID_AUTOCONFIG # auto-configuration of RAID components 3261.1Seeh 3271.1Seeh## Memory disk device, used on boot floppies with compressed 3281.1Seeh## kernel-plus-root-disk images. 3291.1Seeh 3301.1Seehpseudo-device md 1 3311.1Seeh 3321.1Seeh 3331.1Seeh#### Network interfaces 3341.1Seeh 3351.1Seeh## LANCE Ethernet - an AMD 7990 LANCE behind specialized DMA glue 3361.1Seeh## Three flavors of additional SBus ethernets are available. One attaches 3371.1Seeh## directly like the sun4c on-board, one uses the ledma device like the 3381.1Seeh## sun4m on-board, and one uses the lebuffer device. 3391.1Seeh 3401.8Seehledma0 at sbus? slot ? offset ? # sun4m on-board 3411.8Seehle0 at ledma0 # sun4m on-board 3421.8Seehle* at sbus? slot ? offset ? # SBus 3431.8Seehledma* at sbus? slot ? offset ? # SBus 3441.8Seehle* at ledma? # SBus 3451.8Seehlebuffer0 at sbus? slot ? offset ? # SBus 3461.8Seehle0 at lebuffer? # SBus 3471.8Seehlebuffer* at sbus? slot ? offset ? # SBus 3481.8Seehle* at lebuffer? # SBus 3491.1Seeh 3501.1Seeh## Happy Meal Ethernet 3511.1Seehhme* at sbus? slot ? offset ? 3521.8Seehhme* at pci? dev ? function ? # network "hme" compatible 3531.8Seehhme0 at pci2 dev 1 function 1 # U5/U10 on-board 3541.1Seeh 3551.1Seeh# MII/PHY support 3561.1Seeh# XXX: only nsphy "tested" 3571.1Seehexphy* at mii? phy ? # 3Com internal PHYs 3581.1Seehicsphy* at mii? phy ? # Integrated Circuit Systems ICS1890 3591.1Seehinphy* at mii? phy ? # Intel 82555 PHYs 3601.1Seehlxtphy* at mii? phy ? # Level One LXT-970 PHYs 3611.1Seehnsphy* at mii? phy ? # NS83840 PHYs 3621.1Seehqsphy* at mii? phy ? # Quality Semiconductor QS6612 PHYs 3631.1Seehsqphy* at mii? phy ? # Seeq 80220/80221/80223 PHYs 3641.1Seehtlphy* at mii? phy ? # ThunderLAN PHYs 3651.1Seehukphy* at mii? phy ? # generic unknown PHYs 3661.1Seeh 3671.1Seeh## qec/be, qec/hme 3681.1Seehqec* at sbus? slot ? offset ? 3691.1Seehbe* at qec? 3701.1Seehqe* at qec? 3711.1Seeh 3721.1Seeh## Loopback network interface; required 3731.1Seehpseudo-device loop 3741.1Seeh 3751.1Seeh## SLIP and CSLIP interfaces, for IP over a serial line. 3761.1Seehpseudo-device sl 2 3771.1Seeh 3781.1Seeh## PPP, the successor to SLIP. See pppd(8). 3791.1Seehpseudo-device ppp 2 3801.1Seeh 3811.1Seeh## Starmode Radio IP, a special hardware network device. 3821.1Seehpseudo-device strip 1 3831.1Seeh 3841.1Seeh## Network "tunnel" device, allowing protocol stacks to run in the userland. 3851.1Seeh## This is used by the third-party user-mode "ppp" program, and others. 3861.1Seehpseudo-device tun 4 3871.1Seeh 3881.1Seeh## Generic L3 over IP tunnel 3891.1Seeh#pseudo-device gre 2 # generic L3 over IP tunnel 3901.1Seeh 3911.1Seeh## Berkeley Packet Filter, required to run RARPD. A generic C-language 3921.1Seeh## interface that allows selective examining of incoming packets. 3931.1Seehpseudo-device bpfilter 8 3941.1Seeh 3951.1Seeh## IP Filter, used in firewall and NAT applications. See ipnat(8) for 3961.1Seeh## one example of the use of the IP Filter. 3971.1Seehpseudo-device ipfilter 3981.1Seeh 3991.1Seeh## for IPv6 4001.1Seehpseudo-device gif 4 # IPv[46] over IPv[46] tunnel (RFC1933) 4011.1Seeh#pseudo-device faith 1 # IPv[46] tcp relay translation i/f 4021.1Seeh#pseudo-device stf 1 # 6to4 IPv6 over IPv4 encapsulation 4031.1Seeh 4041.1Seeh 4051.1Seeh#### Audio and video devices 4061.1Seeh 4071.1Seeh## /dev/audio support (`audiocs' plus `audio') 4081.1Seeh## 4091.8Seehaudiocs* at sbus? slot ? offset ? # SUNW,CS4231 4101.1Seehaudio* at audiocs? 4111.1Seeh 4121.1Seeh 4131.1Seeh## Sun "bwtwo" black and white framebuffer, found on sun4, sun4c, and sun4m 4141.1Seeh## systems. If your sun4 system has a cgfour installed in the P4 slot, 4151.1Seeh## the P4 entries for "bwtwo" will attach to the overlay plane of the 4161.1Seeh## "cgfour". 4171.1Seeh 4181.8Seeh#bwtwo0 at sbus? slot ? offset ? # sun4c and sun4m 4191.8Seeh#bwtwo* at sbus? slot ? offset ? 4201.1Seeh 4211.1Seeh## Sun "cgthree" Sbus color framebuffer 4221.1Seeh#cgthree0 at sbus? slot ? offset ? 4231.1Seeh#cgthree* at sbus? slot ? offset ? 4241.1Seeh 4251.1Seeh## Sun "cgsix" accelerated color framebuffer. 4261.1Seehcgsix0 at sbus? slot ? offset ? 4271.1Seehcgsix* at sbus? slot ? offset ? 4281.1Seeh 4291.1Seeh## Sun FFB not supported 4301.1Seeh#ffb* at upa? 4311.1Seeh 4321.1Seeh#### Other device configuration 4331.1Seeh 4341.1Seeh## Pseudo ttys, required for network logins and programs like screen. 4351.1Seeh 4361.7Sjdolecekpseudo-device pty # pseudo-ttys (for network, etc.) 4371.1Seeh 4381.1Seeh## Random device, used to implement /dev/random (a source of random noise), 4391.1Seeh## and generate randomness for some kernel formulae. 4401.1Seeh 4411.1Seehpseudo-device rnd 442