v4.0/src/DEV/SMARTDRV/FL13.ASM

   1         TITLE   Assembler helper routines for FLUSH13
   2
   3 PAGE    58,132
   4
   5
   6 memS    EQU     1               ; Small model
   7 ?PLM    =       0               ; Standard 'C'
   8 ?WIN    =       0               ; Not windows
   9
  10 include cmacros.inc
  11
  12 ;extern int      IOCTLOpen(char *);
  13 ;extern int      IOCTLWrite(int,char *,int);
  14 ;extern int      IOCTLRead(int,status *,int);
  15 ;extern int      IOCTLClose(int);
  16
  17 sBegin  CODE
  18
  19 assumes CS, CODE
  20 assumes DS, DATA
  21
  22 ;**     IOCTLOpen - Open the indicated device and make sure it's a device
  23 ;
  24 ;  ENTRY:
  25 ;       Pointer to name of device
  26 ;  EXIT:
  27 ;       AX = -1 if error, device not opened
  28 ;       else AX = handle of open device
  29 ;  USES:
  30 ;       Standard 'C'
  31 ;
  32 cProc IOCTLOpen, <PUBLIC>, <si,di,es>
  33
  34 ParmW Nameptr
  35
  36 cBegin
  37         mov     dx,Nameptr
  38         MOV     AX,3D02H
  39         INT     21H             ; Open the device
  40         JC      NO_DEV_ERR      ; No device
  41         MOV     BX,AX
  42         MOV     AX,4400H
  43         INT     21H             ; Make sure it IS a device
  44         JC      CLOSE_NO_DEV
  45         TEST    DX,4080H
  46         JZ      CLOSE_NO_DEV
  47         mov     ax,bx           ; Return the handle
  48         jmp     short PXDONE
  49
  50 CLOSE_NO_DEV:
  51         mov     ax,3e00H        ; Close
  52         int     21H
  53 NO_DEV_ERR:
  54         mov     ax,-1
  55 PXDONE:
  56 cEnd
  57
  58 ;**     IOCTLClose - Close the indicated handle
  59 ;
  60 ;  ENTRY:
  61 ;       Handle
  62 ;  EXIT:
  63 ;       None
  64 ;  USES:
  65 ;       Standard 'C'
  66 ;
  67 cProc IOCTLClose, <PUBLIC>, <si,di,es>
  68
  69 ParmW Handle
  70
  71 cBegin
  72         mov     bx,Handle
  73         MOV     AX,3E00H
  74         INT     21H             ; close the device
  75 cEnd
  76
  77 ;**     IOCTLWrite - Perform IOCTLWrite to device handle
  78 ;
  79 ;  ENTRY:
  80 ;       Handle to open device
  81 ;       Pointer to data to write
  82 ;       Count in bytes of data to write
  83 ;  EXIT:
  84 ;       AX = -1 error
  85 ;       else AX = input count
  86 ;  USES:
  87 ;       Standard 'C'
  88 ;
  89 cProc IOCTLWrite, <PUBLIC>, <si,di,es>
  90
  91 ParmW WHandle
  92 ParmW WDataPtr
  93 ParmW WCount
  94
  95 cBegin
  96         mov     bx,WHandle
  97         mov     cx,WCount
  98         mov     dx,WDataPtr
  99         MOV     AX,4403H        ; IOCTL Write
 100         INT     21H
 101         JC      Werr
 102         CMP     AX,CX
 103         JNZ     Werr
 104         jmp     short WDONE
 105
 106 WERR:
 107         mov     ax,-1
 108 WDONE:
 109 cEnd
 110
 111 ;**     IOCTLRead - Perform IOCTLRead to device handle
 112 ;
 113 ;  ENTRY:
 114 ;       Handle to open device
 115 ;       Pointer to data area to read into
 116 ;       Count in bytes of size of data area
 117 ;  EXIT:
 118 ;       AX = -1 error
 119 ;       else AX = input count
 120 ;  USES:
 121 ;       Standard 'C'
 122 ;
 123 cProc IOCTLRead, <PUBLIC>, <si,di,es>
 124
 125 ParmW RHandle
 126 ParmW RDataPtr
 127 ParmW RCount
 128
 129 cBegin
 130         mov     bx,RHandle
 131         mov     cx,RCount
 132         mov     dx,RDataPtr
 133         MOV     AX,4402H        ; IOCTL Read
 134         INT     21H
 135         JC      Rerr
 136         CMP     AX,CX
 137         JNZ     Rerr
 138         jmp     short RDONE
 139
 140 RERR:
 141         mov     ax,-1
 142 RDONE:
 143 cEnd
 144
 145
 146 sEnd    CODE
 147
 148         end