obp/obp/arch/sun4u/starthacks.fth

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\ Hypervisor Software File: starthacks.fth
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id: @(#)starthacks.fth 1.11 05/04/08
purpose:
copyright: Copyright 2005 Sun Microsystems, Inc.  All Rights Reserved
copyright: Use is subject to license terms.

also hidden also

headerless
: monitor-interrupt-state  ( -- )
   \ I bet we get an interrupt right now
   restartable? @  0=  if
      h# 0d pil! ]unlock
   then
;
: client-interrupt-state  ( -- )
;

\ Actions to perform in order to recover from an error reset
defer error-reset-cleanup ' noop is error-reset-cleanup

: safe-execute  ( method-name ihandle -- )
   ?dup  if                       ( method$ ihandle )
      ['] $call-method catch  if  ( method$ ihandle )
         3drop                    (  )
      then                        (  )
   else                           ( method$ )
      2drop
   then
;

\ This turns on the screen in case the screen went blank as the result
\ of an error reset.  Some SBus frame buffers tend to do that.
: ?reset-video  ( -- )
   " reset-screen" stdout @  safe-execute
;

headers
defer debugger-vocabulary-hook
' noop is debugger-vocabulary-hook
headerless
: "restore" " restore" ;
: enter-forth  ( -- )
   init-c-stack
   monitor-interrupt-state
   clear-keyboard

   \ Just In case we were in the device tree.
   device-end

   \ Allow for custom search orders
   debugger-vocabulary-hook

   ?reset-video
   error-reset-trap -1 = if
      "restore" stdout @ safe-execute
      "restore" stdin @ safe-execute
      error-reset-cleanup
   then
   (handle-breakpoint
;

: exit-forth  ( -- )  reset-interrupts  (restart  ;

\ set the default state, and also force it in stand-init
' enter-forth is handle-breakpoint
' exit-forth  is restart

stand-init: Installing enter/exit handlers
   ['] enter-forth is handle-breakpoint
   ['] exit-forth  is restart
   ?mp-prompt
;
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