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COMMENT #
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* MODULE NAME : INDEOVP *
* *
* 5669-196 (C) COPYRIGHT 1988 Microsoft Corp. *
* *
* DESCRIPTIVE NAME: Override prefix macros *
* *
* STATUS (LEVEL) : Version (0) Level (1.0) *
* *
* FUNCTION : DATAOV - Creates a prefix so that the next instruction *
* accesses data twice as wide as it normally would.*
* Bytes go to words, and words go to double words. *
* ADDROV - Creates a prefix so that the next instruction *
* uses 32 bit addresses instead of 16 bit. *
* SEGOV - Creates a segment override prefix for the next *
* instruction. *
* *
* MODULE TYPE : MAC *
* *
* REGISTER USAGE : 80286 Standard *
* *
* CHANGE ACTIVITY : *
* *
* $MAC(INDEOVP) COMP(LOAD) PROD(3270PC) : *
* *
* $D0=D0004700 410 870604 D : NEW FOR RELEASE 1.1 *
* $P1=P0000311 410 870804 D : RENAME MODULE'S LIBRARY FILE TYPE TO "MAC" *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
#
PAGE
; DATAOV - Create a prefix for an instruction so that it accesses data twice
; as wide as it normally would have. If the instruction was to access
; bytes then it will access words. If it was to access words then it
; will access double words (32 bits).
DATAOV MACRO
DB 066H
ENDM
PAGE
; ADDROV - Create a prefix for an instruction so that it uses 32 bit addresses
; instead of 16 bit addresses.
ADDROV MACRO
DB 067H
ENDM
PAGE
; SEGOV - Segment Prefix Overrides
; This macro will create segment prefix overrides for all the segment registers
; on the 80386. It will also create prefixes for the data override and address
; override as listed in the DATOV and ADDROV macros above.
;
; Syntax: SEGOV ES | CS | SS | DS | FS | GS | DATA | ADDRESS
;
SEGOV MACRO SR
IFIDN <&SR>,<ES>
DB 026H
ENDIF
IFIDN <&SR>,<es>
DB 026H
ENDIF
IFIDN <&SR>,<CS>
DB 02EH
ENDIF
IFIDN <&SR>,<cs>
DB 02EH
ENDIF
IFIDN <&SR>,<SS>
DB 036H
ENDIF
IFIDN <&SR>,<ss>
DB 036H
ENDIF
IFIDN <&SR>,<DS>
DB 03EH
ENDIF
IFIDN <&SR>,<ds>
DB 03EH
ENDIF
IFIDN <&SR>,<FS>
DB 064H
ENDIF
IFIDN <&SR>,<fs>
DB 064H
ENDIF
IFIDN <&SR>,<GS>
DB 065H
ENDIF
IFIDN <&SR>,<gs>
DB 065H
ENDIF
IFIDN <&SR>,<DATA>
DB 066H
ENDIF
IFIDN <&SR>,<data>
DB 066H
ENDIF
IFIDN <&SR>,<ADDRESS>
DB 067H
ENDIF
IFIDN <&SR>,<address>
DB 067H
ENDIF
ENDM
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