v4.0/src/INC/MSHEAD.ASM

   1 ;       SCCSID = @(#)mshead.asm 1.1 85/04/10
   2 ; TITLE   MSHEAD.ASM -- MS-DOS DEFINITIONS
   3 PAGE
   4 ; MS-DOS  High-performance operating system for the 8086  version 1.28
   5 ;       by Microsoft MSDOS development group:
   6 ;           TP (Ret.)
   7 ;           AR
   8 ;           NP (Parenting)
   9 ;           MZ
  10 ;           CP (BIOS) (ret.)
  11
  12 ; ****************** Revision History *************************
  13 ;          >> EVERY change must noted below!! <<
  14 ;
  15 ; 0.34 12/29/80 General release, updating all past customers
  16 ; 0.42 02/25/81 32-byte directory entries added
  17 ; 0.56 03/23/81 Variable record and sector sizes
  18 ; 0.60 03/27/81 Ctrl-C exit changes, including register save on user stack
  19 ; 0.74 04/15/81 Recognize I/O devices with file names
  20 ; 0.75 04/17/81 Improve and correct buffer handling
  21 ; 0.76 04/23/81 Correct directory size when not 2^N entries
  22 ; 0.80 04/27/81 Add console input without echo, Functions 7 & 8
  23 ; 1.00 04/28/81 Renumber for general release
  24 ; 1.01 05/12/81 Fix bug in `STORE'
  25 ; 1.10 07/21/81 Fatal error trapping, NUL device, hidden files, date & time,
  26 ;               RENAME fix, general cleanup
  27 ; 1.11 09/03/81 Don't set CURRENT BLOCK to 0 on open; fix SET FILE SIZE
  28 ; 1.12 10/09/81 Zero high half of CURRENT BLOCK after all (CP/M programs don't)
  29 ; 1.13 10/29/81 Fix classic "no write-through" error in buffer handling
  30 ; 1.20 12/31/81 Add time to FCB; separate FAT from DPT; Kill SMALLDIR; Add
  31 ;               FLUSH and MAPDEV calls; allow disk mapping in DSKCHG; Lots
  32 ;               of smaller improvements
  33 ; 1.21 01/06/82 HIGHMEM switch to run DOS in high memory
  34 ; 1.22 01/12/82 Add VERIFY system call to enable/disable verify after write
  35 ; 1.23 02/11/82 Add defaulting to parser; use variable escape character Don't
  36 ;               zero extent field in IBM version (back to 1.01!)
  37 ; 1.24 03/01/82 Restore fcn. 27 to 1.0 level; add fcn. 28
  38 ; 1.25 03/03/82 Put marker (00) at end of directory to speed searches
  39 ; 1.26 03/03/82 Directory buffers searched as a circular queue, current buffer
  40 ;               is searched first when possible to minimize I/O
  41 ;      03/03/82 STORE routine optimized to tack on partial sector tail as
  42 ;               full sector write when file is growing
  43 ;      03/09/82 Multiple I/O buffers
  44 ;      03/29/82 Two bugs:  Delete all case resets search to start at beginning
  45 ;               of directory (infinite loop possible otherwise), DSKRESET
  46 ;               must invalidate all buffers (disk and directory).
  47 ; 1.27 03/31/82 Installable device drivers
  48 ;                 Function call 47 - Get pointer to device table list
  49 ;                 Function call 48 - Assign CON AUX LIST
  50 ;      04/01/82 Spooler interrupt (INT 28) added.
  51 ; 1.28 04/15/82 DOS retructured to use ASSUMEs and PROC labels around system
  52 ;               call entries.  Most CS relative references changed to SS
  53 ;               relative with an eye toward putting a portion of the DOS in
  54 ;               ROM.  DOS source also broken into header, data and code pieces
  55 ;      04/15/82 GETDMA and GETVECT calls added as 24 and 32.  These calls
  56 ;               return the current values.
  57 ;      04/15/82 INDOS flag implemented for interrupt processing along with
  58 ;               call to return flag location (call 29)
  59 ;      04/15/82 Volume ID attribute added
  60 ;      04/17/82 Changed ABORT return to user to a long ret from a long jump to
  61 ;               avoid a CS relative reference.
  62 ;      04/17/82 Put call to STATCHK in dispatcher to catch ^C more often
  63 ;      04/20/82 Added INT int_upooler into loop ^S wait
  64 ;      04/22/82 Dynamic disk I/O buffer allocation and call to manage them
  65 ;               call 49.
  66 ;      04/23/82 Added GETDSKPTDL as call 50, similar to GETFATPT(DL), returns
  67 ;               address of DPB
  68 ;      04/29/82 Mod to WRTDEV to look for ^C or ^S at console input when
  69 ;               writting to console device via file I/O.  Added a console
  70 ;               output attribute to devices.
  71 ;      04/30/82 Call to en/dis able ^C check in dispatcher Call 51
  72 ;      04/30/82 Code to allow assignment of func 1-12 to disk files as well
  73 ;               as devices....  pipes, redirection now possible
  74 ;      04/30/82 Expanded GETLIST call to 2.0 standard
  75 ;      05/04/82 Change to INT int_fatal_abort callout int HARDERR.  DOS SS
  76 ;               (data segment) stashed in ES, INT int_fatal_abort routines must
  77 ;               preserve ES.  This mod so HARDERR can be ROMed.
  78 ; 1.29 06/01/82 Installable block and character devices as per 2.0 spec
  79 ;      06/04/82 Fixed Bug in CLOSE regarding call to CHKFATWRT.  It got left
  80 ;               out back about 1.27 or so (oops).  ARR
  81 ; 1.30 06/07/82 Directory sector buffering added to main DOS buffer queue
  82 ; 1.40 06/15/82 Tree structured directories.  XENIX Path Parser MKDIR CHDIR
  83 ;               RMDIR Xenix calls
  84 ; 1.41 06/13/82 Made GETBUFFR call PLACEBUF
  85 ; 1.50 06/17/82 FATs cached in buffer pool, get FAT pointer calls disappear
  86 ;               Frees up lots of memory.
  87 ; 1.51 06/24/82 BREAKDOWN Revised to do EXACT one sector read/write through
  88 ;               system buffers
  89 ; 1.52 06/30/82 OPEN, CLOSE, READ, WRITE, DUP, DUP2, LSEEK implemented
  90 ; 1.53 07/01/82 OPEN CLOSE mod for Xenix calls, saves and gets remote dir
  91 ; 1.54 07/11/82 Function calls 1-12 make use of new 2.0 PDB. Init code
  92 ;               changed to set file handle environment.
  93 ; 2.00 08/01/82 Number for IBM release
  94 ;      01/19/83 No environ bug in EXEC
  95 ;      01/19/83 MS-DOS OEM INT 21 extensions (SET_OEM_HANDLER)
  96 ;      01/19/83 Performance bug fix in cooked write to NUL
  97 ;      01/27/83 Growcnt fixed for 32-bits
  98 ;      01/27/83 Find-first problem after create
  99 ; 2.01 02/17/83 International DOS
 100 ; 2.10 03/09/83 Start of NETWORK support
 101 ;               New Buffer structure
 102 ;               New Sytem file table structure
 103 ;               FCB moved to internal representation
 104 ;               DOS re-organized
 105 ; 2.11 04/21/83 Continuation of 2.10, preliminary Network
 106 ;               device interface.
 107 ; 2.50 09/12/83 More network stuff
 108 ;
 109 ; *************************************************************
 110
 111 INCLUDE DOSSYM.INC
 112 INCLUDE DEVSYM.INC
 113
 114 Break <SEGMENT DECLARATIONS>
 115
 116 ; The following are all of the segments used.  They are declared in the order
 117 ; that they should be placed in the executable
 118
 119 ;
 120 ; segment ordering for MSDOS
 121 ;
 122
 123 include dosseg.asm
 124
 125 AsmVar  <Installed>
 126
 127 START           SEGMENT BYTE PUBLIC 'START'
 128                 ASSUME  CS:DOSGROUP,DS:NOTHING,ES:NOTHING,SS:NOTHING
 129         JMP     near ptr DOSINIT
 130 START           ENDS
 131
 132 LAST            SEGMENT PARA PUBLIC 'LAST'
 133         Extrn   DOSINIT:NEAR
 134 LAST            ENDS