v4.0/src/DEV/XMAEM/INDEOVP.MAC

   1 COMMENT #
   2 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
   3 *                                                                             *
   4 * MODULE NAME     : INDEOVP                                                   *
   5 *                                                                             *
   6 *                    5669-196 (C) COPYRIGHT 1988 Microsoft Corp.              *
   7 *                                                                             *
   8 * DESCRIPTIVE NAME: Override prefix macros                                    *
   9 *                                                                             *
  10 * STATUS (LEVEL)  : Version (0) Level (1.0)                                   *
  11 *                                                                             *
  12 * FUNCTION        : DATAOV - Creates a prefix so that the next instruction    *
  13 *                            accesses data twice as wide as it normally would.*
  14 *                            Bytes go to words, and words go to double words. *
  15 *                   ADDROV - Creates a prefix so that the next instruction    *
  16 *                            uses 32 bit addresses instead of 16 bit.         *
  17 *                   SEGOV  - Creates a segment override prefix for the next   *
  18 *                            instruction.                                     *
  19 *                                                                             *
  20 * MODULE TYPE     : MAC                                                       *
  21 *                                                                             *
  22 * REGISTER USAGE  : 80286 Standard                                            *
  23 *                                                                             *
  24 * CHANGE ACTIVITY :                                                           *
  25 *                                                                             *
  26 * $MAC(INDEOVP) COMP(LOAD) PROD(3270PC) :                                     *
  27 *                                                                             *
  28 * $D0=D0004700 410 870604 D : NEW FOR RELEASE 1.1                             *
  29 * $P1=P0000311 410 870804 D : RENAME MODULE'S LIBRARY FILE TYPE TO "MAC"      *
  30 *                                                                             *
  31 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
  32 #
  33
  34 PAGE
  35 ; DATAOV - Create a prefix for an instruction so that it accesses data twice
  36 ;          as wide as it normally would have.  If the instruction was to access
  37 ;          bytes then it will access words.  If it was to access words then it
  38 ;          will access double words (32 bits).
  39
  40 DATAOV  MACRO
  41          DB      066H
  42         ENDM
  43
  44 PAGE
  45 ; ADDROV - Create a prefix for an instruction so that it uses 32 bit addresses
  46 ;          instead of 16 bit addresses.
  47
  48 ADDROV  MACRO
  49          DB      067H
  50         ENDM
  51
  52 PAGE
  53 ; SEGOV - Segment Prefix Overrides
  54 ; This macro will create segment prefix overrides for all the segment registers
  55 ; on the 80386.  It will also create prefixes for the data override and address
  56 ; override as listed in the DATOV and ADDROV macros above.
  57 ;
  58 ; Syntax:  SEGOV   ES | CS | SS | DS | FS | GS | DATA | ADDRESS
  59 ;
  60
  61 SEGOV   MACRO   SR
  62         IFIDN   <&SR>,<ES>
  63          DB      026H
  64         ENDIF
  65         IFIDN   <&SR>,<es>
  66          DB      026H
  67         ENDIF
  68         IFIDN   <&SR>,<CS>
  69          DB      02EH
  70         ENDIF
  71         IFIDN   <&SR>,<cs>
  72          DB      02EH
  73         ENDIF
  74         IFIDN   <&SR>,<SS>
  75          DB      036H
  76         ENDIF
  77         IFIDN   <&SR>,<ss>
  78          DB      036H
  79         ENDIF
  80         IFIDN   <&SR>,<DS>
  81          DB      03EH
  82         ENDIF
  83         IFIDN   <&SR>,<ds>
  84          DB      03EH
  85         ENDIF
  86         IFIDN   <&SR>,<FS>
  87          DB      064H
  88         ENDIF
  89         IFIDN   <&SR>,<fs>
  90          DB      064H
  91         ENDIF
  92         IFIDN   <&SR>,<GS>
  93          DB      065H
  94         ENDIF
  95         IFIDN   <&SR>,<gs>
  96          DB      065H
  97         ENDIF
  98         IFIDN   <&SR>,<DATA>
  99          DB      066H
 100         ENDIF
 101         IFIDN   <&SR>,<data>
 102          DB      066H
 103         ENDIF
 104         IFIDN   <&SR>,<ADDRESS>
 105          DB      067H
 106         ENDIF
 107         IFIDN   <&SR>,<address>
 108          DB      067H
 109         ENDIF
 110         ENDM
 111