Annotation of gforth/ec/mirrored.fs, revision 1.2

1.1       pazsan      1: \ mirror.fs mirrors ram in rom and copies back at startup
                      2: 
1.2     ! anton       3: \ Copyright (C) 1998 Free Software Foundation, Inc.
        !             4: 
        !             5: \ This file is part of Gforth.
        !             6: 
        !             7: \ Gforth is free software; you can redistribute it and/or
        !             8: \ modify it under the terms of the GNU General Public License
        !             9: \ as published by the Free Software Foundation; either version 2
        !            10: \ of the License, or (at your option) any later version.
        !            11: 
        !            12: \ This program is distributed in the hope that it will be useful,
        !            13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15: \ GNU General Public License for more details.
        !            16: 
        !            17: \ You should have received a copy of the GNU General Public License
        !            18: \ along with this program; if not, write to the Free Software
        !            19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            20: 
1.1       pazsan     21: 0 [IF]
                     22: 
                     23: For the romable feature:
                     24: 
                     25: We need to save the ram area (there might be initialized variables,
                     26: and code-fields...) into rom and copy it back at system startup.
                     27: 
                     28: [THEN]
                     29: 
                     30: \ save ram area
                     31: 
                     32: unlock >CROSS
                     33: 
                     34: : saveram
                     35:   mirror-link 
                     36:   BEGIN @ dup WHILE
                     37:        >r r@ >rstart @ r@ >rdp @ over - tuck
                     38:        2dup X , X , X here swap tcmove
                     39:        X allot X align
                     40: 
                     41: >rom
                     42: unlock sramdp @ lock           constant ram-start
                     43: unlock ramdp @ sramdp @ - lock constant ram-len
                     44: variable ram-origin
                     45: ram-start ram-origin ram-len unlock tcmove lock 
                     46: ram-len allot align
                     47: >auto
                     48: 
                     49: : mirrorram
                     50:   ram-origin ram-start ram-len cmove ;
                     51: 

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