obp/obp/dev/sun4v-devices/console/methods.fth

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\ Hypervisor Software File: methods.fth
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id: @(#)methods.fth 1.1 06/02/16
purpose:
copyright: Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
copyright: Use is subject to license terms.

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alias ubreak?  hyperbreak?
alias (ukey?)  hyperkey?
alias (ukey)   hyperkey
alias uemit    hyperemit

d# 90  constant  ubufsize
ubufsize buffer: ubuf
0       value  getptr
0       value  putptr
0       value  endptr

variable ttylock

: initubuf ( -- )
   ubuf   dup  is getptr
          dup  is putptr
   ubufsize +  is endptr
;

: ubuf-empty? ( -- flag )  getptr putptr = ;

\ Read a key into the buffer, ignoring overrun
: bput ( key -- )
   putptr endptr >=  if  ubuf is putptr  then
   putptr c!  putptr 1+ is putptr
;

\ Clear the buffer
: bputclr ( -- )  getptr is putptr ;

\ Read a key from the buffer
: bget ( -- key )
   getptr endptr >=  if  ubuf is getptr  then
   getptr c@  getptr 1+ is getptr
;

: uread ( -- )
   ttylock on
   begin  (ukey?)  while  (ukey) bput  repeat
   ttylock off
;

: ukey? ( -- flag )  uread  ubuf-empty? 0=  ;
: ukey  ( -- char )  begin  ukey?  until  bget ;


: clear-break ( -- )
   ukey? drop bputclr  false to ubreak?
;

: poll-tty  ( -- )
   ttylock @ if  exit  then
   ubreak?  if  clear-break  user-abort  then
   \ Give lower levels chance to work.
   ukey? drop
;

h# 7f constant mask-#data

: /string  ( adr len cnt -- adr+cnt len-cnt )  tuck 2swap +  -rot -  ;

external

: open ( -- ok? ) initubuf  ttylock off  true ;

: close ( -- )  ;

: read   ( adr len -- #read )
   ukey? 0=  if  2drop -2  exit  then           ( adr len )
   tuck                                         ( len adr len )
   begin  dup 0<>   ukey? 0<>  and  while       ( len adr len )
     over  ukey mask-#data and swap c!          ( len adr len )
     1 /string                                  ( len adr' len' )
   repeat                                       ( len adr' len' )
   nip -                                        ( #read )
;

: write  ( adr len -- #written )
   tuck  bounds  ?do    ( len )
      i c@  uemit       ( len )
   loop                 ( len )
;

: install-abort  ( -- )  ['] poll-tty d# 10 alarm  ;

: remove-abort   ( -- )  ['] poll-tty     0 alarm  ;

: restore ( -- ) ;

: ring-bell  ( -- )  ;

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