Initial commit of OpenSPARC T2 architecture model.

[OpenSPARC-T2-SAM] / obp / obp / pkg / termemu / fontdi.fth

\ ========== Copyright Header Begin ==========================================
\ 
\ Hypervisor Software File: fontdi.fth
\ 
\ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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\ ========== Copyright Header End ============================================
\ id: @(#)fontdi.fth 1.4 01/04/06
\ purpose: 
\ copyright: Copyright 1990-2001 Sun Microsystems, Inc.  All Rights Reserved
\
\ Support for drop in font code
\ 
\ a drop in font looks like:
\   High address:
\
\      font-data    (size)	 bytes of font data
\      default-font (16 bytes)	 Null-terminated string
\      Reserved	    (4 bytes)	 reserved for future extension - must be 0
\      Checksum	    (4 bytes)	 32-bit sum of image bytes
\      Image size   (4 bytes)	 size in bytes of image
\      Magic Number (4 bytes)	 "OBMD"
\      Sync bytes   (1-3 bytes)	 Enough 0x01 bytes to align the Magic Number
\				 on a 4-byte boundary.
\
\   Low address:

headerless
0 value (romfont)
: (install-font) " fonts" do-drop-in (romfont) ;
['] (install-font) is romfont

\ The idea behind this is: The first call that requires a font
\ causes the dropin to load, then after that only the address of the
\ loaded font is returned.
\
\ This save us memory when nobody is using a display device.
\
tail-chain: execute-buffer  ( adr len -- )
   over 4 " font" $= if			( addr len )
     dup alloc-mem dup to (romfont)	( adr len vadr )
     ['] (romfont) is romfont		( -- )
     swap move				( -- )
     exit
   then
tail;