AUSAM/sys/other/defines.b40
/*
***********************************************************************
* *
* X X XXXX XXXXX XXXX *
* XX XX X X X X X *
* X XX X X X X X XXXX *
* X X X X X X X *
* X X X X X X X X *
* X X XXXX XXXXX XXXX *
* *
* The following defines represent certain improvements and *
* enhancements to the unix 'op sys'. To negate the effect of *
* these changes just delete the define by commenting it out. *
* Corrections of obvious deficiencies and so on are not to be *
* `ifdefed' since they will always be required. See FIXES below *
* *
* For those who intend to alter the 'op sys' please bear the *
* following points in mind: *
* *
* 1. please indicate time - date - who *
* *
* 2. why was mod needed. what was done. how it was done. *
* which source modules were altered. etc . . . *
* *
* 3. any other information which may be considered helpful *
* for a person following your alterations. *
* *
* Ian J. *
* *
***********************************************************************
*/
/* (not _1170)
#define _1170
/*
* bio.c once.c m70.s l70.s trap.c user.h
* rdwri.c sys1.c
*
* includes stuff specific to 70 cpu's.
* such as UNIBUS MAP etc...
* Use JNR m70.s which handles floating point properly,
* handles an 11/70 cpu as an 11/70 cpu - that is to
* say uses the ERROR registers properly etc...
* This entails altering 'trap' ,user.h and l.s
*/
/* ( no UNIBUS_MAP )
#ifdef _1170
#define UNIBUS_MAP
#endif _1170
/*
* bio.c powerf.s m70.s
*
* enable code for Unibus Map.
*/
/* (not _1145)
#define _1145
/*
* bio.c once.c m45.s l45.s trap.c user.h
* rdwri.c sys1.c
*
* includes stuff specific to 45 cpu's.
* Use JNR m45.s which handles floating point properly,
* handles an 11/45 cpu as an 11/45 cpu - that is to
* say uses the ERROR registers properly etc...
* This entails altering 'trap' ,user.h and l.s
*/
#define _1140
/*
* clock.c param.h slp.c
*
* includes stuff specific to 40 cpu's.
*/
#define FPU
/*
* user.h m70.s m45.s
*
* FP11-b or FP11-c installed
*/
#define RHSTART
/*
* bio.c
*
* include code for newer type controllers
* e.g. RJP04 on RH70 or RP04 on RH11
*/
/* (no DEVSTART)
#define DEVSTART
/*
* bio.c
*
* rk type contollers on system !!
*/
/* (not PROG_CLOCK)
#define PROG_CLOCK
/*
* clock.c once.c
*
* if you have a programmable clock only
* saves some code ...
*/
#define SHARED_DATA
/*
* Ian Johnstone FEBRUARY '76
*
* sig.c slp.c sys4.c sysent.c trap.c user.h
* sys1.c text.c text.h once.c param.h
*
* New special a.out magic number 0412 signifies shared data
* segment (r/w text area). Must be swapped out on last use
* not just abandoned. Swap synchronization initially a problem,
* definitive solution made AUG 77 in conjunction with
* LOWER_TEXT_SWAPS alteration.
* `x_spid' and word 6 of A.OUT header contain shared data
* identification field - inode pointer not good enough (not unique),
* since shared data segments are shared between any number
* of co-operating processes.
* Initially implemented to support UNSW batch system.
* P and V system calls implemented to allow process
* synchronization. LKED does the linking needed for
* creation of 412 a.outs.
* db4.s needs to be altered to define text,data,stack size
* displacements in user.h. cdb,ddt too.
*/
#define ZOMBIE
/*
* Chris Maltby MARCH 77
*
* sys1.c proc.h sys4.c slp.c clock.c
*
* Several variables in the proc structure are used to store
* post-mortem information about processes. This avoids the swap
* out & in of previous version for exit & wait. Process
* terminations (exit&wait) go substantially faster.
* Alternative process structure pz_* contains definition of
* process area for dead processes. A few of the scheduling
* routines have been altered so that no attempts are made
* to alter the process area of `dead'ns'.
*/
#define INIT_FIX
/*
* Chris Maltby MARCH 77
*
* sys1.c
*
* /etc/init (process one) only woken up when required.
* Previously every process termination in the system woke
* the init process. This is only necessary if the parent
* of the dying process is already dead. ``the whole piece
* of code that deals with this is still a mess''.
* PS needs to know of this alteration.
*
* Piers Lauder AUGUST 77
*
* The whole thing re-written using a single scan of the
* proc array (up to 4 previously). MORE efficient.
* Now the code is understandable.
*
*/
#define TIME_LIMITS
/*
* Chris Maltby MARCH 77
*
* clock.c param.h user.h sys4.c sysent.c sig.c proc.h
*
* User area variables 'u.u_cpusec' and 'u.u_tix' contain
* seconds and clock ticks left before time limit expiry.
* A signal SIGCPULT is generated when
* cpusec becomes zero. A process with a limit of zero is
* not restricted - this is normal state.
* Limit passed to children so that if `n' seconds
* to go before expiry before fork, after
* fork each process will have `n' seconds to go!!
*
* Ian Johnstone AUGUST 77
*
* sys4.c sysent.c user.h
*
* New system call "clktim" is implemented by these changes.
* Allows user to request a signal SIGTIMEOUT in `n' seconds(real)
* `n' is passed in r0. If p_rtl is non-zero then a real
* time limit has been set. When a limit has been set
* the clock interrupt routine decrements p_rtl once a second
* until zero when the signal is sent. This involves little extra
* cost to the system as the whole proc array is scanned each
* second anyway. Main cost is extra word in process table entry.
* Limit passed to children so that if 'n' seconds
* to go before expiry before fork, after fork each process
* will have 'n' seconds before being signalled.
*/
#define GPROCS
/*
* received JUNE 77 second mailing (Rand)
*
* sys1.c sysent.c
*
* Returns system proc array to user. Returns also the number of
* process slots.
* PS modified to use this - makes PS go faster
*/
#ifndef ZOMBIE
#define BETTER_EXIT
/*
* john lions class of '76
*
* sys1.c
*
* Shrink process to USIZE on entry to exit.
*/
#endif ZOMBIE
#define BETTER_TIME
/*
* Ian Johnstone & Andrew Hume SEPTEMBER 76
*
* alloc.c
*
* update() always updates on root file system super block.
* After booting time more likely to be correct. Also allows
* knowledge of when a system crashed to within 30 seconds.
* Omitting to set date at BOOT of system less likley
* to cause havoc with incremental dumps.
*/
#define EP_ADDRESS
/*
* Craig McGregor AUGUST 76
*
* sys1.c user.h
*
* Implement entry point address as described in programmers
* manual.
*
* db4.s needs to be altered to define text,data,stack size
* displacements in user.h. ps,cdb,ddt too.
* see /usr/source/s1/errlog.c for error logger code.
*/
#ifdef _1140
#define BIG_UNIX
#endif
/*
* Jeff Rottman jul 77
*
* once.c m40.s user.h
*
* This mod is a means of expanding the available addressing
* space for the resident operating system on pdp-11/40 style
* memory-management UNIX systems. A new linker `sysld' is
* used to generate such a system - A sysld command file specifies
* the division of the resident system into _s_e_g_m_e_n_t_s, one of
* which, the _r_o_o_t segment, is always addressable using
* segmentation pages 0 through 4. All the other segments
* share page 5, and are addressable only when running. Page
* 6, as is usual, is reserved for the _U-table addressing, and
* page 7 for the I/O page.
*
*/
#define VICAR
/*
* Chris Maltby JUNE 77 Ian Johnstone AUGUST 77
*
* systm.h user.h ( with side effects in tty.c )
*
* Utilize `u.u_heap' as scratch area for erase and delete
* processing. Eliminates canonb[] from systm.h.
* Saves space.
*/
#define NEW_TIMEOUT
/*
* Piers Lauder AUGUST 77
*
* m40.s m45.s clock.c param.h systm.h
*
* New timeout function utilises blocks off the clist
* for increased efficiency.
*/
/* (not UN_TIMEOUT)
#ifdef NEW_TIMEOUT
#define UN_TIMEOUT
#endif
/*
* Piers Lauder AUGUST 77
*
* clock.c
*
* Allows cancellation of the effect of a previous call
* to timeout.
*/
/* (not SETPSW)
#define SETPSW
/*
* clock.c sys4.c sysent.c trap.c m40.s m45.s
*/
#define CBLOCK_16
/*
* Piers Lauder AUGUST 77
*
* m70.s m40.s m45.s once.c tty.c
*
* Allow larger cblocks. PUTC,GETC re-written to be 15% faster,
* as well as being parametric.
*/
#define TTY_TRUE_RAW
/*
* Piers Lauder AUGUST 77
*
* tty.c tty.h & all tty drivers
*
* Allows the use of full 8 bit data
* on tty lines iff RAW flag set
* and other flags except HUPCL are reset.
*/
#define TTY_HISPEED
/*
* Piers Lauder AUGUST 77
*
* tty.c tty.h & all tty drivers
*
* Provides suitable water marks for high speed terminals.
*/
/* (not TTY_FLOW_CONTROL)
#define TTY_FLOW_CONTROL
/*
* Piers Lauder AUGUST 77
*
* tty.c tty.h & getty stty
*
* Allows tty.c to drive DIABLO type terminals
* at high baud rates ( >= 1200 )
*/
#define STACK_LIMIT
/*
* Peter Hewitt & Dave Horsfall & Craig McGregor MAY 77
*
* once.c param.h
*
* Implement stack limit register.
*/
#define SMDATE
/*
* UNIX version 6 with mod by Ian Johnstone AUGUST 77
*
* sys4.c sysent.c
*
* Enable smdate from level 6 system distribution.
* This call was originally commented out because of
* problems with incremental dumps - pseudo old
* files not dumped. Smdate as implemented
* now only allows super-user to modify the access date
* hopefully super users know what they are doing.
*/
#define NEW_SLEEP
/*
* Piers Lauder + Ian Johnstone AUGUST 77
*
* proc.h sys2.c clock.c systm.h param.h sys4.c
*
* Sleep system calls now do unique sleeps
* ( avoiding thrashing on wakeups of TOUT )
*
* Each proc entry has one additional word p_stl
* which when non-zero indicates that a sleep is in progress
* once a second the clock interrupt routine decrements this
* count, when reaches zero process woken up. This involves
* little extra overhead as the proc array is already scanned
* once a second for other purposes.
*/
#ifdef BIG_UNIX
#define ONCE
#endif
/*
* Ian Johnstone AUGUST 77
*
* once.c(main.c) slp.c tty.c bio.c alloc.c c.c
*
* Normally this change only in effect when BIG_UNIX is in effect
* however there exists no reason why ONCE can not be used without
* BIG_UNIX. main.c renamed once.c. The initialization routines
* cinit,binit,iinit are moved to once.c from tty.c,bio.c and
* alloc.c respectively by this change. Also estabur,nseg,sureg
* are moved from once.c to slp.c. Buffer allocation(declaration)
* is moved to c.c (in conf).
*/
#ifdef _1170
#define CRASH_TRACE
#endif
/*
* Ian Johnstone AUGUST 77
*
* trap.c param.h
*
* When system panics print out contents
* of cpu error registers.
*/
/* (not MALLOC_CHECK)
#define MALLOC_CHECK
/*
* Ian Johnstone + Andrew Hume AUGUST 77
*
* malloc.c
*
* Introduce means of gathering statistics of memory
* and swap space allocation under unix.
* Statistics gathered from this change instigated the
* LOWER_TEXT_SWAPS mod below.
*/
#define RAW_BUFFER_POOL
#define NRAWBUFS 10
/*
* Ian Johnstone SEPTEMBER 77
*
* once.c bio.c and others disk/tape raw i/o interfaces as reqd.
*
* In order to improve system performance allocate 'NRAWBUFS'
* buffer headers - these headers to be used for swapping and
* general raw i/o. Instead if using 'swbuf' for all swap
* i/o in the system, allocate from the raw buffer pool.
* If 'physio' is passed a null buffer pointer then
* it will allocate a buffer for the i/o and free it on completion
* of the i/o. Current raw i/o interfaces then do not have to be
* altered unless desired. The main benefit to these interfaces
* will be that on multiple devices overlapped seeks will
* possible, also ordered queueing of raw
* i/o requests can also be done. (assuming a clever driver)
* Improves swapping. 'NRAWBUFS' should be 2 greater
* than the expected number of simultaneous raw i/o operations
* to prevent lockout of swap i/o.
*
*/
#define SLOSHED
/*
* Chris Maltby SEPTEMBER 77
*
* tty.c
*
* Change to canon to allow erases to delete kills
* In the process rewrote it to be more
* deterministic (and better).
* Handles \ erase-char properly. ie. doesnt assume '#' & '@'
* For penny-pinchers this change costs 44 bytes
*
*/
#define LOWER_TEXT_SWAPS
/*
* Chris Maltby SEPTEMBER 77
*
* slp.c text.c text.h
*
* This alteration drastically reduces the number of swaps
* undertaken by UNIX. For example on Ian J's 11/70 swapping
* was reduced by about 85%. What more can I say !!
* When attaching to a shared text segment that was not
* already core resident the following procedure was
* followed:
* 1. If in swap space goto 6
* 2. Expand process size to enable read of
* text from the a.out.
* 3. Read text segment.
* 4. Allocate swap space for text segment
* and swap the segment out
* 5. Expand process size to USIZE.
* 6. Swap out process!!
* 7. Call sched.
* When the process is swapped back in to core
* all will magically be taken care of.
*
* This is a little inefficient to say the least and
* 47 % of all swaps counted were for 1024 bytes.
*
* The new scheme:
* 1. if in swap space goto 6
* 2. Expand process size to enable read of
* text from the a.out.
* 3. Read text segment.
* 4. Separate User Per Process area and text Segment
* and install text segment in core. Mark it as not yet
* swapped.
* 5. Continue execution of process
* 6. Swap in text segment.
* 7. goto 5
* Note that only if required will the shared text segment now
* be swapped. It is now possible to run a shared
* text program that will cause no swapping if
* the program is not "sticky bit"ed.
*
* AND all this only costs 98 bytes...
*/
#define B_AGE
/*
* Jeff Rottman Sep 77
*
* buf.h bio.c
*
* Allow proper handling of write behind blocks
* on freelist. Put at head of free queue those blocks
* that have to be written.
*/
/* (not SLOW_CONSOLE)
#define SLOW_CONSOLE
/*
* ian johnstone oct 77
*
* prf.c
*
* enable the generation of filler characters
* by system putchar routine - if '\r' output
*/
#define LARGE_FILE_REFERENCES
/*
* Ian Johnstone Nov '77
*
* user.h fio.c sys1.c sys3.c
*
* Allows > 127 references to a file structure,
* up to maximum of 255 with ENREF error if exceeded.
* Previously this condition would cause (catastophic)
* errors.
*/
/*
#define ERROR_LOG
/*
* Piers Lauder Nov '77
*
* prf.c c.c
*
* change putchar to allow system program "errlogger"
* to record "printf" messages instead of console.
* Implements device "/dev/errlog".
*/
/*
#define NICE_PUTCHAR
/*
* Piers Lauder Nov '77
*
* prf.c
*
* change putchar to use tty driver for non-panic
* messages;
*/
/* (not TTY_INVCASE)
#define TTY_INVCASE
/*
* Piers Lauder Nov '77
*
* tty.h tty.c
*
* handle inverted case terminals
* yes - they exist.
*/
#define COOL_NO_SPACE
/*
* Piers Lauder Nov '77
*
* alloc.c
*
* Since most programs ignore errors on write,
* attempt to be a little less enthusiastic
* with "no space" messages. The change is a
* call to sleep on "lbolt", the effect is to
* slow up programs doing repeated write calls
* after no space error.
*/
/* (not ILLEGAL_C)
#define ILLEGAL_C
/*
* Piers Lauder Nov '77
*
* partab.c bx.c
*
* Enhance the table to know about communication
* bytes which are illegal in a 7-bit + parity
* protocol.
*/
#define UPRINTS
/*
* Piers Lauder Jan '78
*
* prf.c
*
* This includes code implementing the routine "uprints"
* which will print a system message on the tty
* associated with the current process.
*/
#define DELAY
/*
* Piers Lauder Jan '78
*
* clock.c
*
* this includes code implementing the routine "delay"
* which will delay the caller for a period using a
* "timeout - sleep - wakeup" sequence.
*/
#define MAX_PROC
/*
* Ian Johnstone Jan '78
*
* clock.c sig.c slp.c sys1.c sys4.c proc.h
*
* Keep track of which slot in the proc table is the last one
* in use, and when searching the proc table only go up to maxproc
* rather than &proc[NPROC]. This does speed things up a little.
* Ken Thompson is also supposed to have found that the
* system spends most of its time scanning the proc array.
* For example ps is now many times faster less to transfer less to scan.
* For example consider a system with NPROC=200 and 5 active processes
* ZOMBIE defined - WITHOUT MAX_PROC time for executing wait was 1.18ms
* - WITH MAX_PROC time for executing wait was 0.34ms - thus the benefits
* are obvious in those parts of the system that search the proc table.
* NOTE: time == elapsed time == user time + system time
* These values obtained on AGSM's 11/70
*/
#ifdef MAX_PROC
/* (no HIGH_PROC )
#define HIGH_PROC
/*
* Ian Johnstone Jan '78
*
* proc.h slp.c
*
* Enable code to keep proc high water mark in high_proc.
*/
#endif
#define LRU_INODE
/*
* UNKNOWN HACKER -- university of toronto
* Improved debugged installed Ian Johnstone Jan 78
*
* inode.h iget.c clock.c sys3.c sys4.c
*
* Incore inode structures are allocated on an LRU basis, and
* if a requested Inode is still in core, it is not read in
* again. This seems to dramatically speed up pathname
* searches, which do an awful lot of iget's and iput's.
* For example a stat of a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a/a
* previously took 1.1 seconds (avg) per call this change
* reduces this to 0.07 seconds (avg) !!!!
* These tests carried out on AGSM 11/70 (1 RP04)
*/
/* (not U_LOCK)
#define U_LOCK
/*
* Pies Lauder Feb '78
*
* sys4.c bio.c
*
* provide code to implement system calls "slockon", "slockoff"
* so that super users may lock themselves in memory.
*/
/* (not IGNORE_SIGNALS)
#define IGNORE_SIGNALS
/*
* Piers Lauder Apr '78
*
* proc.h sig.c slp.c sys1.c sys4.c
*
* Introduce "p_ignsig" - a sixteen bit boolean array
* in which "true" means that the correspondingly
* numbered signal is being ignored. Basically this
* stops swaps for ignored signals.
*/
/*
#define MEM_PAR_INTR
/*
* Piers Lauder Apr '78
* Ian Johnstone May '78
*
* once.c trap.c
*
* For 11/40s enable parity checking if it exists (once.c).
* In trap.c report all memory parity errors, if user mode
* then SIGMEMPAR the process.
*/
/* (no POWER_FAIL)
#define POWER_FAIL
/*
* Ian Johnstone May '78
*
* l70.s powerf.s m70.s
* conf.h c.c dz.c dj.c hp.c rk.c msc.c kl.c lp.c cr.c
* crd.c ht.c tm.c prf.c user.h
*
* If defined all singing all dancing powerfail recovery.
* If not defined just loop ....
*/
/* (not U_DELAY)
#ifdef DELAY
#define U_DELAY
#endif
/*
* Piers Lauder Apr '78
*
* sys4.c sysent.c
*
* Implement new system call "sdelay" for sleeping for a number of ticks.
*/
#define AUSAM16
#define AUSAML
/*
* Andrew Hume - Peter Ivanov - Ian Johnstone
* Piers Lauder - John Lions - Chris Maltby
* Greg Rose
*
* bio.c dz.c rk.c tty.c inode.h
* alloc.c clock.c debug.c fio.c iget.c
* malloc.c nami.c once.c pipe.c rdwri.c
* sig.c slp.c subr.c sys1.c sys2.c
* sys3.c sys4.c sysent.c text.c trap.c
* user.h proc.h pzomb.h systm.h
*
* AUSAM16 - change to support 16 bit user id's
* AUSAML - Limit structures
* limits system call (sys4)
* proc limits (sys1)
* modified wait (sys1)
*
*/
#define LOCKING
/*
* GGR 17-3-78.
* Enables the locking and unlocking of files to ensure safe read/write
* accesses on a "n-reader, one writer" basis.
* Three new syscalls (readlock, writelock, unlock), and attendent
* software all over the place.
*/
#ifndef AUSAM16
#define GROUP_ACCESS
#endif
/*
* so well established no known author !!
*
* fio.c sysent.c sys4.c
*
* allow groups access checking etc.
* by defing this symbol will allow unix so
* generated to support groups as distributed
* by BELL - yuk.
*/
#define MANY_USERS
/*
* C. Maltby 6/4/78
*
* slp.c clock.c
*
* Really a fix to allow for more CPU bound
* in-core tasks. Where there are likely to be several
* of these then original BELL 'SCHMAG' (clock.c) and
* the 'PRIORATE' in setpri could lead the scheduler
* to select a CPU-bound task first.
*
* SCHMAG ==> clock ticks/second upper limit for I/O bound things
*
* PRIORATE ==> rate at which cpu-bound priority is dropped
*/
#define MORE_USER_PRIORITIES
/*
* Chris Maltby May 78
*
* param.h sys4.c
*
* Changes PUSER to 64, thus allowing a greater diversity
* of user priority levels. Coupled with MANY USERS mod
* it should provide better scheduling on busy machines
*/
/* ( no SWITCH_DISPLAY )
#define SWITCH_DISPLAY
/*
* Chris Maltby APR 78
*
* slp.c m70.s
*
* make an interesting display in location 70
* count of swtch's in last 8 ticks
*/
/* ( no DEBUG_SWAP )
#define DEBUG_SWAP
/*
* Peter Ivanov, John Lions, and Greg Rose APR 78
*
* slp.c clock.c bio.c debug.c
*
* certain debugging aids inserted to check
* for erroneous swaps.
*/
#define BETTER_PANIC
/*
* slp.c prf.c
*
* Greg Rose and John Lions APR 78
* Ian Johnstone MAY 78
*
* Changes to "swtch" to make it refuse to
* schedule processes during a panic.
* The first panic is the most important - remember
* its message string only.
*/
#define TTY_CONNECT
/*
*
* user.h tty.h tty.c c.c conf.h sysent.c
* param.h
*
* Ian Johnstone MAY 78
*
* Support for the logical connection of two tty ports
* a great assistance for inter-machine communication !!
* NEW sys call:
* sys connect; master-fd; slave-fd; master cntrl-char
* where
* master-fd and slave-fd are files descriptors associated
* with teletype ports ( dj-dz-kl ).
*
* ALL chars received from master or slave tty are re-directed
* to the output queue of the slave or master tty respectively.
* IF the master cntrl-char is received from the master tty
* then -
* 1. the connect system call returns to caller.
* 2. all re-direction of chars from master/slave stops.
*
*/
/* ( no TTY_SUSER )
#define TTY_SUSER
/*
* Chris Maltby MAY 78
* Ian Johnstone JUN 78
*
* tty.c
*
* Non-super users restricted to 'TTY_MAXSPD' baud as max
* attainable speed !!
* ONLY super-users may 'stty/gtty' terminals that are
* not the controlling tty for the process.
*/
/* ( no SYS_time )
#define SYS_TIME
/*
* Ian Johnstone MAY 78
*
* m70.s trap.c
*
* Include code (optionally) in m70.s to return
* the systems idea of the time (hh:mm).
* Found to be useful for noting times of system crashes !!
* call: systime( timstr )
* char timestr[6];
*
*/
/* ( no MAPPED_BUFFERS )
#define MAPPED_BUFFERS
#define ZOMBIE
#define QMOUNT
/*
* Ian Johnstone - Greg Rose - Chris Maltby MAY 78
*
* alloc.c binit.h bio.c buf.h
* crd.c defines.h iget.c iinit.h
* lp.c nami.c once.c param.h
* rdwri.c subr.c sys1.c sys3.c
* systm.h user.h
*
* Use KDA5 to page buffers from the buffer pool.
* In binit at system startup the buffer pool is
* malloced and the buffer headers setup to addrees
* them - if UNIBUS_MAP defined then b_xmem & b_addr
* are set up so that unibus map will work - otherwise
* b_xmem & b_addr contain full n-bit address.
* This change costs 8Kb from kernal data space (loss of reg)
* but does recover the data space previously occupied
* by the buffers.
* The only hassle is having to load KA5 prior to accessing
* a buffers contents, bswtch (m70.s) will do this given
* address of buffer header.
*/
#define QMOUNT
/*
* Ian Johnstone - Greg Rose - Chris Maltby MAY 78
*
* iinit.h bio.c alloc.c sys3.c
*
* Use buffers out of buffer pool for mounted
* super-blocks mark these buffers with B_MOUNT flag
* Main advantage is that when an update happens
* buffers need not be allocated to copy super-blocks to
* but can merely be written in-place !!
* icheck -s, df ... should work better too
* NOTE: MUST BE USED IF MAPPED_BUFFERS IN USE *******
*/
/*
#define MALLOC_UMAP
/*
* Chris Maltby Jun 78
*
* param.h systm.h binit.c bio.c
*
* Allows better allocation of UNIBUS-MAP via
* a call to malloc to allocate only as much as is
* required for this I/O. Avoids problem with previous
* method when used with MAPPED_BUFFERS. This should
* allow multiple raw I/O's and swaps.
*
* MUST BE USED WITH MAPPED_BUFFERS
*/
/*
***********************************************************************
* *
* XXXXXX X X X XXXXXX XXXX *
* X X X X X X *
* XXXXX X XX XXXXX XXXX *
* X X XX X X *
* X X X X X X X *
* X X X X XXXXXX XXXX *
* *
* Please document all necessary fixes (fix obvious bugs) to the *
* 'op sys' here. no defines etc just documentation. Same plea *
* with respect to documenting mods apply. *
* To indicate a fix in source code just put a comment on altered *
* lines referencing 'fixnnn' and document it here. *
* *
***********************************************************************
*/
/*
* fix000
* Ian Johnstone AUGUST 77
*
* bio.c file.h filsys.h ino.h inode.h
* alloc.c clock.c fio.c iget.c nami.c once.c
* pipe.c rdwri.c sig.c subr.c sys1.c sys2.c
* sys4.c text.c proc.h systm.h user.h
*
* These alterations mainly concerned with
* utilizing the facilities of the latest C compiler.
* All char * and int * which really were of unsigned type
* have been altered.
* Register arguments to procedures declared where noted
* Ian Johnstone early 77
* All int [2] type whose purpose was to implement 32-bit
* arithmetic have been declared long - code altered as required
* to cope with new declarations.
* Ian Johnstone et al 77
* Correctly declare pointers. for example if a pointer
* is a pointer to an inode structure then declare it thus
*/
/*
* fix001
* Jeff Rottman JUNE 77
*
* bio.c rdwri.c
*
* It has been suggested that `read ahead'
* may cause deadly embraces, so dmr/bio.c
* can be modded to stop read ahead if desired.
* The problem exists when ever the number of
* processes in "breada" + the number of processes
* in "exec" + the number of mounted file systems
* exceeds NBUF.
*/
/*
* fix002
* Dave Horsfall APRIL 77
* Ian Johnstone APRIL 78 (corrected)
*
* bio.c
*
* There appears to be a race condition in swap() whereby
* the same priority (PSWP) was used to wait for completion of
* i/o and for the buffer. A lower priority now used for
* buffer allocation sleep. See bio.c
*/
/*
* fix003
* John Lions `op sys' class 76
*
* sig.c
*
* No limit to priority because of typo.
* See sig.c
*/
/*
* fix004
* UNSW
*
* text.c
*
* No swap error panic given ?
*/
/*
* fix005
* UNSW
*
* trap.c
*
* Partial fix to overlaying which signal is being
* processed.
* ******* WITHDRAWN *********
*/
/*
* fix006
*
* George Goble purdue university JUNE 77
*
* sys2.c
*
* Chdir sys call could leave free "leaves"
* chdir /tmp
* mkdir a; chdir a
* rmdir /tmp
* cp /null orphan
* chdir /null
*/
/*
* fix007
* Piers Lauder AUGUST 77
*
* tty.c
*
* Get tty.c to echo nl to cr on half duplex terminals
* with CRMOD set.
*/
/*
* fix008
* Piers Lauder AUGUST 77
*
* tty.c
*
* Fix tty.c not to call device start routine
* if timing out.
*/
/*
* fix009
* **************************
* fix made unnecessary by
* SLOSHED modification
* **************************
*
* Piers Lauder AUGUST 77
*
* Maptab.c changed to allow other escaped
* characters e.g. '\b'.
*
*/
/*
* fix010
*
* Piers Lauder AUGUST 77
*
* Cret in m40.s & m45.s changed to allow long values
* to be returned.
*/
/*
* fix011
* Piers Lauder AUGUST 77
*
* once.c
*
* Console start up printout "mem =" altered to give Kb.
*/
/*
* fix012
* 1976
*
* once.c(main.c)
*
* Saves time at initialisation.
* The author hereby declares that no infringement
* of Western Electric copyrights is intended.
*/
/*
* fix013
* Chris Maltby SEPTEMBER 77
*
* fio.c
*
* Super user can now change to zero
* mode directories. (fio.c)
*/
/*
* fix014
* P A Hardie uni of saskatchewan
*
* tty.c
*
* "lost characters fix"
* Ttwrite in tty.c - the mod stops ttstart being interrupted
* and losing the character it was about to output.
*/
/* fix015
* Greg Rose & Chris Maltby UNSW
*
* trap.c m40-45-70.s
*
* make system do t bit tracing properly.
* Rti's are done from all traps except
* t or bpt traps.
*/
/* fix016
* Piers Lauder Nov '77
*
* prf.c
*
* always output panic messages
* even if switches down
*/
/* fix017
* Piers Lauder Nov '77
*
* bio.c
*
* ensure b-resid always zero - drivers may not always
* do this
*/
/* fix018
* Piers Lauder Apr '78
*
* sig.c
*
* Prevent SIGINS from overlaying other signals.
* ( only if simulating floating point )
*/
/* fix019
* Piers Lauder Apr '78
* Chris Maltby May '78
*
* slp.c
*
* Remove spl6() from "sched" while searching proc array.
* It is not clear why this was done in the first place,
* and its effect of locking out interrupts for several
* milliseconds was disastrous for high frequency interrupts.
* At sloop in sched protect runin from the clock !!
* also protect runout after spl6 removed.
*/
/* fix020
* Apr '78
*
* bio.c
*
* correct code that checks if physical i/o
* is wholly within data/stack spaces.
* the following should have worked but didn't !!
* mov $fd,r0 / fd is files descriptor
* / for raw i/o
* sys read ; 64 ; 64 / this generated a segmentation
* / error !!
* The correction is simplicity itself - merely subtract one
* from the sum of 'base+u.u_count'.
*/
/* fix021
* APR 78
*
* sig.c
*
* Don't even create 'core' file if this is a setuid
* process!!. Just test earlier.
*/
/*
* fix022
* MAY 78
*
* tty.c
*
* A really triffic bug this one !!
* when tabs are being expanded in ttyoutput the
* assumption is made that the character queues never fill
* this assumption is FALSE hence infinite loops can occur !!
*
*/
/*
* fix023
* MAY 78
*
* m70.s powerf.s trap.c
*
* instead of these routines magically knowing about
* certain displacements in the user structure define
* their addresses and use these indirectly to reference
* the desired location...
*/
/*
* fix024
* MAY78
*
* slp.c
*
* p_cpu not being initialized in newproc.
* causing new processes to inherit this value
* from last process to occupy the proc slot.
*/
/*
* fix025
* JUN 78
*
* fixes etc from bell for level 6 - more docco to come
*/
/*
* fix026
* JUN 78
*
* alloc.c sys3.c filsys.h
*
* Avoid locking problems in ialloc & ifree.
* Improves search for free inodes (makes it faster).
*/
/*
* fix027
* JUN 78
*
* once.c
*
* Avoid parity errors at start up - use suiword
* instead of fuibyte. Also free all of core in one
* hit not in zillions of little chunks.
*/
/*
* fix028
* JUN 78
*
* trap.c
*
* Remove special significance of system call 63.
* You may now use it for anything. Indirect calls
* of indir will now give SIGSYS.
*/