v4.0/src/DEV/RAMDRIVE/DEVSYM.INC

   1 BREAK <Device table and SRH definition>
   2
   3 ; The device table list has the form:
   4 SYSDEV  STRUC
   5 SDEVNEXT        DD      ?       ;Pointer to next device header
   6 SDEVATT         DW      ?       ;Attributes of the device
   7 SDEVSTRAT       DW      ?       ;Strategy entry point
   8 SDEVINT         DW      ?       ;Interrupt entry point
   9 SDEVNAME        DB      8 DUP (?) ;Name of device (only first byte used for block)
  10 SYSDEV  ENDS
  11
  12 ;
  13 ; Attribute bit masks
  14 ;
  15 ; Character devices:
  16 ;
  17 ; Bit 15 -> must be 1
  18 ;     14 -> 1 if the device understands IOCTL control strings
  19 ;     13 -> 1 if the device supports output-until-busy
  20 ;     12 -> unused
  21 ;     11 -> 1 if the device understands Open/Close
  22 ;     10 -> must be 0
  23 ;      9 -> must be 0
  24 ;      8 -> unused
  25 ;      7 -> unused
  26 ;      6 -> unused
  27 ;      5 -> unused
  28 ;      4 -> 1 if device is recipient of INT 29h
  29 ;      3 -> 1 if device is clock device
  30 ;      2 -> 1 if device is null device
  31 ;      1 -> 1 if device is console output
  32 ;      0 -> 1 if device is console input
  33 ;
  34 ; Block devices:
  35 ;
  36 ; Bit 15 -> must be 0
  37 ;     14 -> 1 if the device understands IOCTL control strings
  38 ;     13 -> 1 if the device determines media by examining the FAT ID byte.
  39 ;           This requires the first sector of the fat to *always* reside in
  40 ;           the same place.
  41 ;     12 -> unused
  42 ;     11 -> 1 if the device understands Open/Close/removable media
  43 ;     10 -> must be 0
  44 ;      9 -> must be 0
  45 ;      8 -> unused
  46 ;      7 -> unused
  47 ;      6 -> unused
  48 ;      5 -> unused
  49 ;      4 -> unused
  50 ;      3 -> unused
  51 ;      2 -> unused
  52 ;      1 -> unused
  53 ;      0 -> unused
  54
  55 DevTyp      EQU     8000H               ; Bit 15 - 1  if Char, 0 if block
  56 CharDev     EQU     8000H
  57 DevIOCtl    EQU     4000H               ; Bit 14 - CONTROL mode bit
  58 ISFATBYDEV  EQU     2000H               ; Bit 13 - Device uses FAT ID bytes,
  59                                         ;  comp media.
  60 OutTilBusy  EQU     2000h               ; Output until busy is enabled
  61 ISNET       EQU     1000H               ; Bit 12 - 1 if a NET device, 0 if
  62                                         ;  not.  Currently block only.
  63 DEVOPCL     EQU     0800H               ; Bit 11 - 1 if this device has
  64                                         ;  OPEN,CLOSE and REMOVABLE MEDIA
  65                                         ;  entry points, 0 if not
  66
  67 EXTENTBIT   EQU     0400H               ; Bit 10 - Currently 0 on all devs
  68                                         ;  This bit is reserved for future use
  69                                         ;  to extend the device header beyond
  70                                         ;  its current form.
  71
  72 ; NOTE Bit 9 is currently used on IBM systems to indicate "drive is shared".
  73 ;    See IOCTL function 9. THIS USE IS NOT DOCUMENTED, it is used by some
  74 ;    of the utilities which are supposed to FAIL on shared drives on server
  75 ;    machines (FORMAT,CHKDSK,RECOVER,..).
  76
  77 ISSPEC      EQU     0010H                     ;Bit 4 - This device is special
  78 ISCLOCK     EQU     0008H                     ;Bit 3 - This device is the clock device.
  79 ISNULL      EQU     0004H                     ;Bit 2 - This device is the null device.
  80 ISCOUT      EQU     0002H                     ;Bit 1 - This device is the console output.
  81 ISCIN       EQU     0001H                     ;Bit 0 - This device is the console input.
  82
  83 ;Static Request Header
  84 SRHEAD  STRUC
  85 REQLEN  DB      ?               ;Length in bytes of request block
  86 REQUNIT DB      ?               ;Device unit number
  87 REQFUNC DB      ?               ;Type of request
  88 REQSTAT DW      ?               ;Status Word
  89         DB      8 DUP(?)        ;Reserved for queue links
  90 SRHEAD  ENDS
  91
  92 ;Status word masks
  93 STERR   EQU     8000H           ;Bit 15 - Error
  94 STBUI   EQU     0200H           ;Bit 9 - Buisy
  95 STDON   EQU     0100H           ;Bit 8 - Done
  96 STECODE EQU     00FFH           ;Error code
  97
  98 ;Function codes
  99 DEVINIT EQU     0               ;Initialization
 100 DINITHL EQU     26              ;Size of init header
 101 DEVMDCH EQU     1               ;Media check
 102 DMEDHL  EQU     15              ;Size of media check header
 103 DEVBPB  EQU     2               ;Get BPB
 104 DEVRDIOCTL EQU  3               ;IOCTL read
 105 DBPBHL  EQU     22              ;Size of Get BPB header
 106 DEVRD   EQU     4               ;Read
 107 DRDWRHL EQU     22              ;Size of RD/WR header
 108 DEVRDND EQU     5               ;Non destructive read no wait (character devs)
 109 DRDNDHL EQU     14              ;Size of non destructive read header
 110 DEVIST  EQU     6               ;Input status
 111 DSTATHL EQU     13              ;Size of status header
 112 DEVIFL  EQU     7               ;Input flush
 113 DFLSHL  EQU     15              ;Size of flush header
 114 DEVWRT  EQU     8               ;Write
 115 DEVWRTV EQU     9               ;Write with verify
 116 DEVOST  EQU     10              ;Output status
 117 DEVOFL  EQU     11              ;Output flush
 118 DEVWRIOCTL EQU  12              ;IOCTL write
 119 DEVOPN  EQU     13              ;Device open
 120 DEVCLS  EQU     14              ;Device close
 121 DOPCLHL EQU     13              ;Size of OPEN/CLOSE header
 122 DEVRMD  EQU     15              ;Removable media
 123 REMHL   EQU     13              ;Size of Removable media header
 124
 125 DevOUT  EQU     16                      ; output until busy.
 126 DevOutL EQU     DevWrt                  ; length of output until busy
 127
 128 SUBTTL