obp/obp/dev/utilities/swapped-access.fth

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\ Hypervisor Software File: swapped-access.fth
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id: @(#)swapped-access.fth 1.1 02/05/15
purpose:
copyright: Copyright 1994-1995,2002 Sun Microsystems, Inc.  All Rights Reserved
copyright: Use is subject to license terms.

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: swapped-rx@ ( vadr -- x )  rx@  xbflip  ;
: swapped-rl@ ( vadr -- l )  rl@  lbflip  ;
: swapped-rw@ ( vadr -- w )  rw@  wbflip  ;

: swapped-rx! ( x vadr -- )  >r xbflip r> rx!  ;
: swapped-rl! ( l vadr -- )  >r lbflip r> rl!  ;
: swapped-rw! ( l vadr -- )  >r wbflip r> rw!  ;

: peeker ( adr rd-acf swap-acf -- false | value true )
   >r execute if                ( value )
     r> execute true            ( value' true )
   else                         ( -- )
     r> drop false              ( false )
   then                         ( value,true | false )
;

: poker  ( data adr wr-acf swap-acf -- false | true  )
   -rot                         ( data swap-acf adr wr-acf )
   2swap                        ( adr wr-acf data swap-acf )
   execute                      ( wr-acf adr data' )
   -rot execute                 ( false | true )
;

: swapped-lpeek ( adr -- false | value true )  ['] lpeek ['] lbflip  peeker  ;
: swapped-wpeek ( adr -- false | value true )  ['] wpeek ['] wbflip  peeker  ;

: swapped-lpoke ( value adr -- flag )  ['] lpoke ['] lbflip  poker  ;
: swapped-wpoke ( value adr -- flag )  ['] wpoke ['] wbflip  poker  ;

headers
: restore-fcodes ( -- )
   ['] rw@ false h# 232 set-token
   ['] rw! false h# 233 set-token
   ['] rl@ false h# 234 set-token
   ['] rl! false h# 235 set-token
   ['] wpeek false h# 221 set-token
   ['] lpeek false h# 222 set-token
   ['] wpoke false h# 224 set-token
   ['] lpoke false h# 225 set-token
;

: setup-swapped-fcodes ( -- )
   ['] swapped-rw@ false h# 232 set-token
   ['] swapped-rw! false h# 233 set-token
   ['] swapped-rl@ false h# 234 set-token
   ['] swapped-rl! false h# 235 set-token
   ['] swapped-wpeek false h# 221 set-token
   ['] swapped-lpeek false h# 222 set-token
   ['] swapped-wpoke false h# 224 set-token
   ['] swapped-lpoke false h# 225 set-token
;

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