Initial commit of OpenSPARC T2 architecture model.

[OpenSPARC-T2-SAM] / obp / obp / pkg / fcode / byteload.fth

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\ 
\ Hypervisor Software File: byteload.fth
\ 
\ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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id: @(#)byteload.fth 2.9 06/06/15
purpose: Implements byte-load interface to FCode interpreter
copyright: Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved
copyright: Use is subject to license terms.

headerless
: compile-byte  ( adr immediate? -- )
   state @ 0=  or  if  execute  else  compile,  then
;

\ Interpret FCode beginning at "adr", with successive FCode bytes
\ separated by "spread" address units.  "spread" is usually 1,
\ but may be otherwise; for example, if "spread" is 4, then the
\ FCode interpreter will fetch every fourth byte (e.g. a byte-wide
\ FCode PROM on a 32-bit justified bus).

defer byte-load-hook ' noop is byte-load-hook
: (byte-load)  ( adr spread -- )

   ['] compile-byte is do-byte-compile

   depth 2-  >r		\ Save stack depth

   \ Interpret byte sequence
   ['] byte-interpret catch ?dup  if  byte-load-hook throw  then

   depth  r> - 	?dup  if
      ??cr ." Warning: Fcode sequence resulted in "
      ." a net stack depth change of "  .d  cr
      nullstring throw
   then
;

headers
: byte-load ( adr spread -- )
   ['] (byte-load)  catch  ?dup  if	( adr spread err# )
      .error				( adr spread )
      2drop
   then
;

\ Support for FCode-encoded dropin drivers
tail-chain: execute-buffer  ( adr len -- )
   over c@  dup  h# f0 h# f3 between  swap h# fd =  or  if
      drop  1 byte-load  exit
   then
tail;