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/*
* fakeio.cpp - memory mapped peripheral emulation code
*
* Copyright (c) 2001-2005 Petr Stehlik of ARAnyM dev team (see AUTHORS)
*
* This file is part of the ARAnyM project which builds a new and powerful
* TOS/FreeMiNT compatible virtual machine running on almost any hardware.
*
* ARAnyM 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.
*
* ARAnyM 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 ARAnyM; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "sysdeps.h"
#include "hardware.h"
#include "cpu_emulation.h"
#include "memory-uae.h"
#include "icio.h"
#include "parameters.h"
#ifdef HW_SIGSEGV
# define FakeIOPlace (addr - HWBase + FakeIOBaseHost)
#else
# define FakeIOPlace Atari2HostAddr(addr)
#endif
uint8 BASE_IO::handleRead(memptr addr) {
return do_get_mem_byte((uint8 *)FakeIOPlace); // fetch from underlying RAM
}
uint16 BASE_IO::handleReadW(memptr addr) {
return (handleRead(addr) << 8) | handleRead(addr+1);
}
uint32 BASE_IO::handleReadL(memptr addr) {
return (handleReadW(addr) << 16) | handleReadW(addr+2);
}
void BASE_IO::handleWrite(memptr addr, uint8 value) {
do_put_mem_byte((uint8 *)FakeIOPlace, value); // store to underlying RAM
}
void BASE_IO::handleWriteW(memptr addr, uint16 value) {
handleWrite(addr, value >> 8);
handleWrite(addr+1, value);
}
void BASE_IO::handleWriteL(memptr addr, uint32 value) {
handleWriteW(addr, value >> 16);
handleWriteW(addr+2, value);
}
/*
vim:ts=4:sw=4:
*/
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