v2.0/source/MSDATA.ASM

   1 SUBTTL Initialized data and data used at DOS initialization
   2 PAGE
   3 ; DATA AREA for MS-DOS
   4
   5 IFNDEF  KANJI
   6 KANJI   EQU     0       ;FALSE
   7 ENDIF
   8
   9 CONSTANTS       SEGMENT BYTE PUBLIC 'CONST'
  10         EXTRN   international_table:BYTE
  11         EXTRN   Current_Country:WORD
  12
  13
  14         ORG     0
  15 CONSTRT EQU     $               ; Start of constants segment
  16
  17         PUBLIC  DevStrLen
  18 DEVSTRLEN DB    3              ; Size of below
  19         PUBLIC  DevString
  20 DEVSTRING DB    "DEV"          ; Dummy device directory
  21
  22 ;
  23 ; Table of routines for assignable devices
  24 ;
  25 ; MSDOS allows assignment if the following standard devices:
  26 ;   stdin  (usually CON input)
  27 ;   stdout (usually CON output)
  28 ;   auxin  (usually AUX input)
  29 ;   auxout (usually AUX output)
  30 ;   stdlpt (usually PRN output)
  31 ;
  32 ; SPECIAL NOTE:
  33 ;   Status of a file is a strange idea.  We choose to handle it in this manner:
  34 ;   If we're not at end-of-file, then we always say that we have a character.
  35 ;   Otherwise, we return ^Z as the character and set the ZERO flag.  In this
  36 ;   manner we can support program written under the old DOS (they use ^Z as EOF
  37 ;   on devices) and programs written under the new DOS (they use the ZERO flag
  38 ;   as EOF).
  39
  40 ; Default FCBs for boot up
  41
  42 sftabl      LABEL   DWORD                     ; file table
  43             DW      -1
  44             DW      -1
  45             DW      sf_default_number  ; Number of entries in table
  46             DB      sf_default_number DUP ( (SIZE sf_entry) DUP (0))
  47
  48         I_AM    NoSetDir,BYTE           ; true -> do not set directory
  49         I_am    DidCTRLC,BYTE           ; true -> we did a ^C exit
  50         I_am    SpaceFlag,BYTE          ; true -> embedded spaces are allowed
  51                                         ; in FCB
  52 ; the next two variables relate to the position of the logical stdout/stdin
  53 ; cursor.  They are only meaningful when stdin/stdout are assigned to the
  54 ; console.
  55
  56         i_am    CARPOS,BYTE             ; cursor position in stdin
  57         i_am    STARTPOS,BYTE           ; position of cursor at beginning
  58                                         ; of buffered input call
  59         I_AM    PFLAG,BYTE
  60         I_AM    VERFLG,BYTE             ; Initialize with verify off
  61         I_AM    CONTPOS,WORD
  62         PUBLIC  CHARCO
  63 CHARCO      DB      00000011B           ; Allows statchks every 4 chars...
  64
  65         I_AM    DMAADD,DWORD            ; User's disk transfer address
  66                                         ; (disp/seg)
  67             ORG     $-CONSTRT-4
  68             DW      80H
  69             DW      ?
  70
  71 ENDMEM      DW      ?
  72
  73             PUBLIC  switch_character
  74 switch_character    DB  '/'
  75
  76             PUBLIC  device_availability
  77 device_availability DB  0FFH
  78
  79             I_AM    FirstArena,WORD         ; first free block found
  80             I_AM    BestArena,WORD          ; best free block found
  81             I_AM    LastArena,WORD          ; last free block found
  82             I_AM    AllocMethod,BYTE        ; how to alloc first(best)last
  83             I_AM    arena_head,WORD
  84
  85 ; The following block of data is used by SYSINIT.  Do not change the order or
  86 ; size of this block
  87
  88             PUBLIC  SYSINITVAR
  89 SYSINITVAR  LABEL   WORD
  90         I_AM    DPBHEAD,DWORD           ; Pointer to head of DPB-FAT list
  91         I_AM    sft_addr,DWORD          ; Pointer to first FCB table
  92             ORG     $-CONSTRT-4
  93             short_addr  sftabl
  94             DW      ?                   ; DOS segment set at INIT
  95
  96 ; The following address points to the CLOCK device
  97         i_am    BCLOCK,DWORD
  98 ; The following address is used by DISKSTATCHK it is always points to the
  99 ; console input device header
 100         I_AM    BCON,DWORD              ; Console device entry points
 101         i_am    NUMIO,BYTE              ; Number of disk tables
 102 MAXSEC      DW      0                   ; Maximum allowed sector size
 103         I_AM    BUFFHEAD,DWORD          ; Pointer to head of buffer queue
 104 DEVHEAD LABEL   DWORD
 105         I_AM    NULDEV,DWORD            ; Set to list start passed by
 106                                         ; BIOS at DOS Init
 107
 108         DW      DEVTYP OR ISNULL
 109         short_addr  SNULDEV
 110         short_addr  INULDEV
 111         DB      "NUL     "
 112
 113
 114         i_am    DAY,BYTE
 115         i_am    MONTH,BYTE
 116         i_am    YEAR,WORD
 117         i_am    DAYCNT,WORD
 118         i_am    WEEKDAY,BYTE
 119         ORG     $-CONSTRT-7
 120         DB      0,0
 121         DW      0,-1
 122         DB      0
 123
 124         I_AM    CURDRV,BYTE             ; Default to drive A
 125         I_AM    LASTENT,WORD
 126         i_am    INDOS,BYTE              ; DOS status for interrupt processing
 127             ORG     $-CONSTRT-1
 128             DB      0
 129         I_AM    ErrorMode,BYTE          ; Flag for INT 24 processing
 130         PUBLIC  WPErr
 131 WPERR       DB      -1                  ; Write protect error flag
 132         I_AM    CONSWAP,BYTE
 133         PUBLIC  IDLEINT
 134 IDLEINT     DB      1
 135         PUBLIC  CNTCFLAG
 136 CNTCFLAG    DB      0                   ; ^C check in dispatch disabled
 137
 138         PUBLIC  LastBuffer
 139 LASTBUFFER  LABEL   DWORD               ; Buffer queue recency pointer
 140             DW      -1
 141             DW      -1
 142
 143 ; Combination of all device call parameters
 144
 145         PUBLIC  DEVCALL
 146 DEVCALL SRHEAD  <>
 147 CALLUNIT    LABEL   BYTE
 148 CALLFLSH    LABEL   WORD
 149         I_AM    CALLMED,BYTE
 150 CALLBR      LABEL   DWORD
 151         PUBLIC  CALLXAD
 152 CALLXAD     LABEL   DWORD
 153         I_AM    CALLRBYT,BYTE
 154         DB      3 DUP(?)
 155         PUBLIC CallBPB
 156 CALLBPB     LABEL   DWORD
 157         I_AM    CALLSCNT,WORD
 158 CALLSSEC    DW      ?
 159
 160         I_AM    CALLDEVAD,DWORD             ; stash for device entry point
 161
 162 ; Same as above for I/O calls
 163
 164         PUBLIC  IOCall
 165 IOCALL  SRHEAD  <>
 166 IOFLSH  LABEL   WORD
 167         PUBLIC  IORCHR
 168 IORCHR  LABEL   BYTE
 169         I_AM    IOMED,BYTE
 170         I_AM    IOXAD,DWORD
 171         I_AM    IOSCNT,WORD
 172         I_AM    IOSSEC,WORD
 173
 174 ; Call struct for DSKSTATCHK
 175         PUBLIC  DSKSTCALL
 176 DSKSTCALL       DB      DRDNDHL
 177                 DB      0
 178         PUBLIC  DSKSTCOM
 179 DSKSTCOM        DB      DEVRDND
 180         I_AM    DSKSTST,WORD
 181                 DB      8 DUP (0)
 182         I_AM    DSKCHRET,BYTE
 183                 short_addr  DEVIOBUF
 184                 DW      ?               ; DOS segment set at Init
 185         PUBLIC  DSKSTCNT
 186 DSKSTCNT        DW      1
 187                 DW      0
 188
 189 ; Days in year
 190         i_am    YRTAB,8
 191         ORG     $-CONSTRT-8
 192         DB      200,166                 ; Leap year
 193         DB      200,165
 194         DB      200,165
 195         DB      200,165
 196
 197 ; Days of each month
 198         i_am    MONTAB,12
 199         ORG     $-CONSTRT-12
 200         DB      31                      ; January
 201         DB      28                      ; February--reset each
 202                                         ; time year changes
 203         DB      31                      ; March
 204         DB      30                      ; April
 205         DB      31                      ; May
 206         DB      30                      ; June
 207         DB      31                      ; July
 208         DB      31                      ; August
 209         DB      30                      ; September
 210         DB      31                      ; October
 211         DB      30                      ; November
 212         DB      31                      ; December
 213
 214         IF      NOT IBM
 215         PUBLIC  OEM_HANDLER
 216 OEM_HANDLER     DD      -1
 217         ENDIF
 218
 219 ;WARNING For HIGHMEM version, these two vars must be at the end of the
 220 ; Constants segment to prevent them getting overwritten.
 221         I_AM    CurrentPDB,WORD
 222         i_am    CreatePDB,BYTE          ; flag for creating a process
 223
 224         PUBLIC  LEAVEADDR
 225 LEAVEADDR LABEL WORD
 226         short_addr    LEAVE
 227
 228 CONSTANTS       ENDS
 229
 230 SUBTTL Uninitialized data overlayed by initialization code
 231 PAGE
 232 DATA    SEGMENT WORD PUBLIC 'DATA'
 233 ; Init code overlaps with data area below
 234
 235         ORG     0
 236         i_am    INBUF,128
 237         I_AM    CONBUF,131              ; The rest of INBUF and console buffer
 238         i_am    TIMEBUF,6
 239         I_AM    DEVIOBUF,2              ; Buffer for I/O under file assignment
 240         I_AM    EXITHOLD,DWORD
 241
 242         PUBLIC  DevFCB
 243 DEVFCB  LABEL   BYTE                ; Uses NAME1, NAME2, NAME3 combined
 244 ; WARNING..  do not alter size or relative location of the following 4 items
 245 ; without first examining FCB_RENAME
 246         I_AM    NAME1,12                ; File name buffer
 247         I_AM    ATTRIB,BYTE
 248         I_AM    NAME2,13
 249         I_AM    NAME3,14
 250
 251         I_AM    EXTFCB,BYTE
 252
 253 ; WARNING - the following two items are accessed as a word
 254         I_AM    CREATING,BYTE
 255         I_AM    DELALL,BYTE
 256
 257         I_AM    FoundDel,BYTE
 258
 259         I_AM    user_SP,WORD
 260         I_AM    user_SS,WORD
 261         I_AM    CONTSTK,WORD
 262         I_AM    SECCLUSPOS,BYTE         ; Position of first sector
 263                                         ; within cluster
 264         I_AM    DSKERR,BYTE
 265         I_AM    TRANS,BYTE
 266         I_AM    READOP,BYTE
 267         I_AM    THISDRV,BYTE
 268         I_AM    THISDPB,DWORD
 269         I_AM    CLUSFAC,BYTE
 270
 271 ; WARNING - the following two items are accessed as a word
 272         I_AM    DRIVESPEC,BYTE
 273         I_AM    ROOTSTART,BYTE
 274
 275         I_AM    CLUSSPLIT,BYTE
 276         i_am    INSMODE,BYTE
 277         I_AM    CLUSSAVE,WORD
 278         I_AM    CLUSSEC,WORD
 279         I_AM    PREREAD,WORD            ; 0 means preread; 1 means optional
 280         I_AM    FATBYT,WORD
 281         I_AM    DEVPT,DWORD
 282         I_AM    THISFCB,DWORD           ; Address of user FCB
 283
 284         I_AM    NEXTADD,WORD
 285         I_AM    RECPOS,4
 286         I_AM    RECCNT,WORD
 287         I_AM    LASTPOS,WORD
 288         I_AM    CLUSNUM,WORD
 289         I_AM    DIRSEC,WORD
 290         I_AM    DIRSTART,WORD
 291         I_AM    SECPOS,WORD             ; Position of first sector accessed
 292         I_AM    VALSEC,WORD             ; Number of valid (previously written)
 293                                         ; sectors
 294         I_AM    BYTSECPOS,WORD          ; Position of first byte within sector
 295         I_AM    BYTPOS,4                ; Byte position in file of access
 296         I_AM    BYTCNT1,WORD            ; No. of bytes in first sector
 297         I_AM    BYTCNT2,WORD            ; No. of bytes in last sector
 298         I_AM    SECCNT,WORD             ; No. of whole sectors
 299         I_AM    ENTFREE,WORD
 300         I_AM    ENTLAST,WORD
 301         I_AM    NXTCLUSNUM,WORD
 302         I_AM    GROWCNT,DWORD
 303         I_AM    CURBUF,DWORD
 304         I_AM    VOLID,BYTE
 305         I_AM    NULLDEVPT,DWORD
 306         I_AM    CINSAV,DWORD
 307         I_AM    CINDSAV,BYTE
 308         I_AM    COUTDSAV,BYTE
 309         I_AM    COUTSAV,DWORD
 310         PUBLIC  SaveBX
 311 SaveBX  DW      ?
 312         PUBLIC  SaveDS
 313 SaveDS  DW      ?
 314         I_AM    ConC_spsave,WORD
 315
 316         I_AM    exit_code,WORD              ; exit code of last proc.
 317         I_am    exit_type,BYTE              ; type of exit...
 318
 319         IF      IBM
 320 ;For 2.00 this pads the DOS so that on a 2 disk IBM PC with no
 321 ;CONFIG.SYS file the space taken up by BIOS, DOS, res COMMAND is
 322 ;about 24K
 323 IBMPAD  DB      540h DUP(?)
 324         ENDIF
 325
 326 ; make those pushes fast!!!
 327 EVEN
 328         DB      0A0H DUP (?)
 329         I_am    AuxStack,0A0h
 330         I_AM    DSKSTACK,0A0h        ; Stack space
 331         PUBLIC  IOSTACK
 332 IOSTACK LABEL   BYTE
 333
 334         PUBLIC  NSS
 335 NSS         DW      ?
 336         PUBLIC  NSP
 337 NSP         DW      ?
 338
 339 PAGE
 340         INCLUDE MSINIT.ASM
 341
 342 \1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a\1a