ShuriZma
/
BizHawk
mirror of https://github.com/TASEmulators/BizHawk.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
BizHawk/libgambatte/src/mem/memptrs.cpp

221 lines
6.6 KiB
C++
Raw Blame History

/***************************************************************************
* Copyright (C) 2007-2010 by Sindre Aamås *
* aamas@stud.ntnu.no *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License version 2 as *
* published by the Free Software Foundation. *
* *
* 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 version 2 for more details. *
* *
* You should have received a copy of the GNU General Public License *
* version 2 along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "memptrs.h"
#include <algorithm>
#include <cstring>
namespace gambatte {
MemPtrs::MemPtrs()
: rmem_(), wmem_(), romdata_(), wramdata_(), vrambankptr_(0), rsrambankptr_(0),
wsrambankptr_(0), memchunk_(0), rambankdata_(0), wramdataend_(0), oamDmaSrc_(OAM_DMA_SRC_OFF),
memchunk_len(0)
{
}
MemPtrs::~MemPtrs() {
delete []memchunk_;
}
void MemPtrs::reset(const unsigned rombanks, const unsigned rambanks, const unsigned wrambanks) {
delete []memchunk_;
memchunk_len = 0x4000 + rombanks * 0x4000ul + 0x4000 + rambanks * 0x2000ul + wrambanks * 0x1000ul + 0x4000;
memchunk_ = new unsigned char[memchunk_len];
romdata_[0] = romdata();
rambankdata_ = romdata_[0] + rombanks * 0x4000ul + 0x4000;
wramdata_[0] = rambankdata_ + rambanks * 0x2000ul;
wramdataend_ = wramdata_[0] + wrambanks * 0x1000ul;
std::memset(rdisabledRamw(), 0xFF, 0x2000);
oamDmaSrc_ = OAM_DMA_SRC_OFF;
rmem_[0x3] = rmem_[0x2] = rmem_[0x1] = rmem_[0x0] = romdata_[0];
rmem_[0xC] = wmem_[0xC] = wramdata_[0] - 0xC000;
rmem_[0xE] = wmem_[0xE] = wramdata_[0] - 0xE000;
setRombank(1);
setRambank(0, 0);
setVrambank(0);
setWrambank(1);
// we save only the ram areas
memchunk_saveoffs = vramdata() - memchunk_;
memchunk_savelen = wramdataend() - memchunk_ - memchunk_saveoffs;
}
void MemPtrs::setRombank0(const unsigned bank) {
romdata_[0] = romdata() + bank * 0x4000ul;
rmem_[0x3] = rmem_[0x2] = rmem_[0x1] = rmem_[0x0] = romdata_[0];
disconnectOamDmaAreas();
}
void MemPtrs::setRombank(const unsigned bank) {
romdata_[1] = romdata() + bank * 0x4000ul - 0x4000;
rmem_[0x7] = rmem_[0x6] = rmem_[0x5] = rmem_[0x4] = romdata_[1];
disconnectOamDmaAreas();
}
void MemPtrs::setRambank(const unsigned flags, const unsigned rambank) {
unsigned char *const srambankptr = flags & RTC_EN
? 0
: (rambankdata() != rambankdataend()
? rambankdata_ + rambank * 0x2000ul - 0xA000 : wdisabledRam() - 0xA000);
rsrambankptr_ = (flags & READ_EN) && srambankptr != wdisabledRam() - 0xA000 ? srambankptr : rdisabledRamw() - 0xA000;
wsrambankptr_ = flags & WRITE_EN ? srambankptr : wdisabledRam() - 0xA000;
rmem_[0xB] = rmem_[0xA] = rsrambankptr_;
wmem_[0xB] = wmem_[0xA] = wsrambankptr_;
disconnectOamDmaAreas();
}
void MemPtrs::setWrambank(const unsigned bank) {
wramdata_[1] = wramdata_[0] + ((bank & 0x07) ? (bank & 0x07) : 1) * 0x1000;
rmem_[0xD] = wmem_[0xD] = wramdata_[1] - 0xD000;
disconnectOamDmaAreas();
}
void MemPtrs::setOamDmaSrc(const OamDmaSrc oamDmaSrc) {
rmem_[0x3] = rmem_[0x2] = rmem_[0x1] = rmem_[0x0] = romdata_[0];
rmem_[0x7] = rmem_[0x6] = rmem_[0x5] = rmem_[0x4] = romdata_[1];
rmem_[0xB] = rmem_[0xA] = rsrambankptr_;
wmem_[0xB] = wmem_[0xA] = wsrambankptr_;
rmem_[0xC] = wmem_[0xC] = wramdata_[0] - 0xC000;
rmem_[0xD] = wmem_[0xD] = wramdata_[1] - 0xD000;
rmem_[0xE] = wmem_[0xE] = wramdata_[0] - 0xE000;
oamDmaSrc_ = oamDmaSrc;
disconnectOamDmaAreas();
}
void MemPtrs::disconnectOamDmaAreas() {
if (isCgb(*this)) {
switch (oamDmaSrc_) {
case OAM_DMA_SRC_ROM: // fall through
case OAM_DMA_SRC_SRAM:
case OAM_DMA_SRC_INVALID:
std::fill(rmem_, rmem_ + 8, static_cast<unsigned char *>(0));
rmem_[0xB] = rmem_[0xA] = 0;
wmem_[0xB] = wmem_[0xA] = 0;
break;
case OAM_DMA_SRC_VRAM:
break;
case OAM_DMA_SRC_WRAM:
rmem_[0xE] = rmem_[0xD] = rmem_[0xC] = 0;
wmem_[0xE] = wmem_[0xD] = wmem_[0xC] = 0;
break;
case OAM_DMA_SRC_OFF:
break;
}
} else {
switch (oamDmaSrc_) {
case OAM_DMA_SRC_ROM: // fall through
case OAM_DMA_SRC_SRAM:
case OAM_DMA_SRC_WRAM:
case OAM_DMA_SRC_INVALID:
std::fill(rmem_, rmem_ + 8, static_cast<unsigned char *>(0));
rmem_[0xB] = rmem_[0xA] = 0;
wmem_[0xB] = wmem_[0xA] = 0;
rmem_[0xE] = rmem_[0xD] = rmem_[0xC] = 0;
wmem_[0xE] = wmem_[0xD] = wmem_[0xC] = 0;
break;
case OAM_DMA_SRC_VRAM:
break;
case OAM_DMA_SRC_OFF:
break;
}
}
}
// all pointers here are relative to memchunk_
#define MSS(a) RSS(a,memchunk_)
#define MSL(a) RSL(a,memchunk_)
SYNCFUNC(MemPtrs)
{
/*
int memchunk_len_old = memchunk_len;
int memchunk_saveoffs_old = memchunk_saveoffs;
int memchunk_savelen_old = memchunk_savelen;
*/
NSS(memchunk_len);
NSS(memchunk_saveoffs);
NSS(memchunk_savelen);
/*
if (isReader)
{
if (memchunk_len != memchunk_len_old || memchunk_saveoffs != memchunk_saveoffs_old || memchunk_savelen != memchunk_savelen_old)
__debugbreak();
}
*/
PSS(memchunk_ + memchunk_saveoffs, memchunk_savelen);
MSS(rmem_[0x0]);
MSS(wmem_[0x0]);
MSS(rmem_[0x1]);
MSS(wmem_[0x1]);
MSS(rmem_[0x2]);
MSS(wmem_[0x2]);
MSS(rmem_[0x3]);
MSS(wmem_[0x3]);
MSS(rmem_[0x4]);
MSS(wmem_[0x4]);
MSS(rmem_[0x5]);
MSS(wmem_[0x5]);
MSS(rmem_[0x6]);
MSS(wmem_[0x6]);
MSS(rmem_[0x7]);
MSS(wmem_[0x7]);
MSS(rmem_[0x8]);
MSS(wmem_[0x8]);
MSS(rmem_[0x9]);
MSS(wmem_[0x9]);
MSS(rmem_[0xa]);
MSS(wmem_[0xa]);
MSS(rmem_[0xb]);
MSS(wmem_[0xb]);
MSS(rmem_[0xc]);
MSS(wmem_[0xc]);
MSS(rmem_[0xd]);
MSS(wmem_[0xd]);
MSS(rmem_[0xe]);
MSS(wmem_[0xe]);
MSS(rmem_[0xf]);
MSS(wmem_[0xf]);
//for (int i = 0; i < 0x10; i++)
//{
// MSS(rmem_[i]);
// MSS(wmem_[i]);
//}
MSS(romdata_[0]);
MSS(romdata_[1]);
MSS(wramdata_[0]);
MSS(wramdata_[1]);
MSS(vrambankptr_);
MSS(rsrambankptr_);
MSS(wsrambankptr_);
MSS(rambankdata_);
MSS(wramdataend_);
NSS(oamDmaSrc_);
}
}
Reference in New Issue View Git Blame Copy Permalink