mirror of
https://github.com/libretro/scummvm.git
synced 2025-01-22 01:57:16 +00:00
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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/*
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* GP2X: Memory tweaking stuff.
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*
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*/
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// Disable symbol overrides so that we can use system headers.
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#define FORBIDDEN_SYMBOL_ALLOW_ALL
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#include <stdio.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <string.h>
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#include "backends/platform/gp2x/gp2x-mem.h"
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extern "C" {
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static volatile unsigned short *gp2x_memregs;
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}
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void SetClock (unsigned c) {
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unsigned v;
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unsigned mdiv,pdiv=3,scale=0;
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// Set ARM920t clock
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c *= 1000000;
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mdiv = (c*pdiv) / SYS_CLK_FREQ;
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mdiv = ((mdiv-8)<<8) & 0xff00;
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pdiv = ((pdiv-2)<<2) & 0xfc;
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scale &= 3;
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v = mdiv | pdiv | scale;
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gp2x_memregs[0x910>>1] = v;
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}
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void patchMMU (void) {
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//volatile unsigned int *secbuf = (unsigned int *)malloc (204800);
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printf ("Reconfiguring cached memory regions...\n");
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//hackpgtable();
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//printf ("Sucess...\n");
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system("/sbin/rmmod mmuhack");
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system("/sbin/insmod -f mmuhack.o");
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int mmufd = open("/dev/mmuhack", O_RDWR);
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if(mmufd < 0) {
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printf ("Upper memory uncached (attempt failed, access to upper memory will be slower)...\n");
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} else {
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printf ("Upper memory cached...\n");
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close(mmufd);
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}
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}
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void unpatchMMU (void) {
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printf ("Restoreing cached memory regions...\n");
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system("/sbin/rmmod mmuhack");
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}
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