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