v4.0/src/INC/DOSSYM.INC

   1 ;       SCCSID = @(#)dossym.asm 1.1 85/04/10
   2 ;       SCCSID = @(#)dossym.asm 1.1 85/04/10
   3         PAGE 80,132
   4 TRUE        EQU 0FFFFh
   5 FALSE       EQU 0
   6
   7 Installed   = TRUE
   8 IFNDEF  DEBUG
   9     DEBUG       = FALSE
  10 ENDIF
  11
  12 include dbcs.sw
  13 include dosmac.INC
  14
  15 include VERSIONA.INC
  16
  17 IF2
  18     %OUT    DOSSYM in Pass 2
  19 ENDIF
  20
  21 BREAK <Control character definitions>
  22
  23 c_DEL       EQU     7Fh                 ;    ASCII rubout or delete previous char
  24 c_BS        EQU     08h                 ; ^H ASCII backspace
  25 c_CR        EQU     0Dh                 ; ^M ASCII carriage return
  26 c_LF        EQU     0Ah                 ; ^J ASCII linefeed
  27 c_ETB       EQU     17h                 ; ^W ASCII end of transmission
  28 c_NAK       EQU     15h                 ; ^U ASCII negative acknowledge
  29 c_ETX       EQU     03h                 ; ^C ASCII end of text
  30 c_HT        EQU     09h                 ; ^I ASCII tab
  31
  32 BREAK <Read This and Weep>
  33
  34 ;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
  35 ;                                                                          ;
  36 ;            C  A  V  E  A  T     P  R  O  G  R  A  M  M  E  R             ;
  37 ;                                                                          ;
  38 ; Certain structures, constants and system  calls  below  are  private  to ;
  39 ; the DOS  and  are  extremely  version-dependent.  They may change at any ;
  40 ; time at  the  implementors'  whim.   As  a  result,  they  must  not  be ;
  41 ; documented to  the  general  public.   If  an  extreme case arises, they ;
  42 ; must be documented with this warning.                                    ;
  43 ;                                                                          ;
  44 ; Those structures and constants that are subject to  the  above  will  be ;
  45 ; marked and bracketed with the flag:                                      ;
  46 ;                                                                          ;
  47 ;            C  A  V  E  A  T     P  R  O  G  R  A  M  M  E  R             ;
  48 ;                                                                          ;
  49 ;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
  50
  51 include bpb.INC
  52
  53 include buffer.INC
  54
  55 BREAK <User stack inside of system call and SysVars>
  56 ; Location of user registers relative user stack pointer
  57
  58 user_environ    STRUC
  59 user_AX     DW      ?
  60 user_BX     DW      ?
  61 user_CX     DW      ?
  62 user_DX     DW      ?
  63 user_SI     DW      ?
  64 user_DI     DW      ?
  65 user_BP     DW      ?
  66 user_DS     DW      ?
  67 user_ES     DW      ?
  68 user_IP     DW      ?
  69 user_CS     DW      ?
  70 user_F      DW      ?
  71 user_environ    ENDS
  72
  73 include sysvar.INC
  74
  75 include vector.INC
  76
  77 include mult.INC
  78
  79 BREAK <Disk map>
  80 ;  MSDOS partitions the disk into 4 sections:
  81 ;
  82 ;  phys sector 0:   +-------------------+
  83 ;       |           | boot/reserved     |
  84 ;       |           +-------------------+
  85 ;       |           |  File allocation  |
  86 ;       v           |      table(s)     |
  87 ;                   |  (multiple copies |
  88 ;                   |     are kept)     |
  89 ;                   +-------------------+
  90 ;                   |     Directory     |
  91 ;                   +-------------------+
  92 ;                   |     File space    |
  93 ;                   +-------------------+
  94 ;                   |   Unaddressable   |
  95 ;                   |  (to end of disk) |
  96 ;                   +-------------------+
  97 ;
  98 ; All partition boundaries are sector boundaries.  The size of the FAT is
  99 ; adjusted to maximize the file space addressable.
 100
 101 include dirent.INC
 102
 103 BREAK <File allocation Table information>
 104 ;
 105 ; The File Allocation Table uses a 12-bit entry for each allocation unit on
 106 ; the disk.  These entries are packed, two for every three bytes.  The contents
 107 ; of entry number N is found by 1) multiplying N by 1.5; 2) adding the result
 108 ; to the base address of the Allocation Table; 3) fetching the 16-bit word
 109 ; at this address; 4) If N was odd (so that N*1.5 was not an integer), shift
 110 ; the word right four bits; 5) mask to 12 bits (AND with 0FFF hex).  Entry
 111 ; number zero is used as an end-of-file trap in the OS and is passed to the
 112 ; BIOS to help determine disk format.  Entry 1 is reserved for future use.
 113 ; The first available allocation unit is assigned entry number two, and even
 114 ; though it is the first, is called cluster 2.  Entries greater than 0FF8H
 115 ; (12-bit fats) or 0FFF8H (16-bit fats) are end of file marks; entries of zero
 116 ; are unallocated.  Otherwise, the contents of a FAT entry is the number of
 117 ; the next cluster in the file.
 118 ;
 119 ; Clusters with bad sectors are tagged with FF7H.  Any non-zero number would
 120 ; do because these clusters show as allocated, but are not part of any
 121 ; allocation chain and thus will never be allocated to a file.  A particular
 122 ; number is selected so that disk checking programs know what to do (ie.  a
 123 ; cluster with entry FF7H which is not in a chain is not an error).
 124
 125 include dpb.INC
 126
 127 include curdir.INC
 128
 129 include cpmfcb.INC
 130
 131 include find.INC
 132
 133 include pdb.INC
 134
 135 include exe.INC
 136
 137 include sf.INC
 138
 139 include arena.INC
 140
 141 include intnat.INC
 142
 143 include mi.INC
 144
 145 fChk    equ 1
 146 fDelim  equ 2
 147 fSpChk  equ 4
 148 fFCB    equ 8
 149
 150 include filemode.INC
 151
 152 include error.INC
 153
 154 include syscall.INC
 155
 156 SUBTTL
 157 \1a