1 /* cache flushing for the PPC
2
3 Copyright (C) 1998,2001,2003,2007 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 3
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, see http://www.gnu.org/licenses/.
19 */
20
21 #include <stddef.h>
22 #include <sys/types.h>
23
24 /* the name is from an AIX (4.3) call (thanks to Dan Prener
25 <prener@watson.ibm.com> for this information) */
_sync_cache_range(caddr_t addr,size_t size)26 void _sync_cache_range(caddr_t addr, size_t size)
27 {
28 size_t cache_block_size=32;
29 caddr_t p=(caddr_t)(((long)addr)&-cache_block_size);
30
31 /* this works for a single-processor PPC 604e, but may have
32 portability problems for other machines; the ultimate solution is
33 a system call, because the architecture is pretty shoddy in this
34 area */
35 for (; p < (addr+size); p+=cache_block_size)
36 asm("dcbst 0,%0\n sync\n icbi 0,%0"::"r"(p));
37 asm("sync\n isync"); /* PPC 604e needs the additional sync
38 according to Tim Olson */
39 }
40