1: \ mirror.fs mirrors ram in rom and copies back at startup
2:
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:
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:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>