forked from dolphin-emu/dolphin
/
EXI_DeviceAGP.cpp
388 lines (366 loc) · 10.7 KB
/
EXI_DeviceAGP.cpp
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// Copyright 2015 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "Core/HW/EXI/EXI_DeviceAGP.h"
#include <algorithm>
#include <memory>
#include <string>
#include <vector>
#include "Common/ChunkFile.h"
#include "Common/CommonTypes.h"
#include "Common/FileUtil.h"
#include "Common/Logging/Log.h"
#include "Common/StringUtil.h"
#include "Core/ConfigManager.h"
namespace ExpansionInterface
{
CEXIAgp::CEXIAgp(int index)
{
m_slot = index;
// Create the ROM
m_rom_size = 0;
LoadRom();
m_address = 0;
}
CEXIAgp::~CEXIAgp()
{
std::string path;
std::string filename;
std::string ext;
std::string gbapath;
SplitPath(m_slot == 0 ? SConfig::GetInstance().m_strGbaCartA :
SConfig::GetInstance().m_strGbaCartB,
&path, &filename, &ext);
gbapath = path + filename;
SaveFileFromEEPROM(gbapath + ".sav");
}
void CEXIAgp::CRC8(const u8* data, u32 size)
{
for (u32 it = 0; it < size; it++)
{
u8 crc = 0;
m_hash = m_hash ^ data[it];
if (m_hash & 1)
crc ^= 0x5e;
if (m_hash & 2)
crc ^= 0xbc;
if (m_hash & 4)
crc ^= 0x61;
if (m_hash & 8)
crc ^= 0xc2;
if (m_hash & 0x10)
crc ^= 0x9d;
if (m_hash & 0x20)
crc ^= 0x23;
if (m_hash & 0x40)
crc ^= 0x46;
if (m_hash & 0x80)
crc ^= 0x8c;
m_hash = crc;
}
}
void CEXIAgp::LoadRom()
{
// Load whole ROM dump
std::string path;
std::string filename;
std::string ext;
std::string gbapath;
SplitPath(m_slot == 0 ? SConfig::GetInstance().m_strGbaCartA :
SConfig::GetInstance().m_strGbaCartB,
&path, &filename, &ext);
gbapath = path + filename;
LoadFileToROM(gbapath + ext);
INFO_LOG(EXPANSIONINTERFACE, "Loaded GBA rom: %s card: %d", gbapath.c_str(), m_slot);
LoadFileToEEPROM(gbapath + ".sav");
INFO_LOG(EXPANSIONINTERFACE, "Loaded GBA sav: %s card: %d", gbapath.c_str(), m_slot);
}
void CEXIAgp::LoadFileToROM(const std::string& filename)
{
File::IOFile pStream(filename, "rb");
if (pStream)
{
u64 filesize = pStream.GetSize();
m_rom_size = filesize & 0xFFFFFFFF;
m_rom_mask = (m_rom_size - 1);
m_rom.resize(m_rom_size);
pStream.ReadBytes(m_rom.data(), filesize);
}
else
{
// dummy rom data
m_rom.resize(0x2000);
}
}
void CEXIAgp::LoadFileToEEPROM(const std::string& filename)
{
// Technically one of EEPROM, Flash, SRAM, FRAM
File::IOFile pStream(filename, "rb");
if (pStream)
{
u64 filesize = pStream.GetSize();
m_eeprom_size = filesize & 0xFFFFFFFF;
m_eeprom_mask = (m_eeprom_size - 1);
m_eeprom.resize(m_eeprom_size);
pStream.ReadBytes(m_eeprom.data(), filesize);
if ((m_eeprom_size == 512) || (m_eeprom_size == 8192))
{
// Handle endian read - could be done with byte access in 0xAE commands instead
for (u32 index = 0; index < (m_eeprom_size / 8); index++)
{
u64 NewVal = 0;
for (u32 indexb = 0; indexb < 8; indexb++)
NewVal = (NewVal << 0x8) | m_eeprom[index * 8 + indexb];
((u64*)(m_eeprom.data()))[index] = NewVal;
}
m_eeprom_add_end = (m_eeprom_size == 512 ? (2 + 6) : (2 + 14));
m_eeprom_add_mask = (m_eeprom_size == 512 ? 0x3F : 0x3FF);
m_eeprom_read_mask = (m_eeprom_size == 512 ? 0x80 : 0x8000);
m_eeprom_status_mask = (m_rom_size == 0x2000000 ? 0x1FFFF00 : 0x1000000);
}
else
m_eeprom_status_mask = 0;
}
else
{
m_eeprom_size = 0;
m_eeprom.clear();
}
}
void CEXIAgp::SaveFileFromEEPROM(const std::string& filename)
{
File::IOFile pStream(filename, "wb");
if (pStream)
{
if ((m_eeprom_size == 512) || (m_eeprom_size == 8192))
{
// Handle endian write - could be done with byte access in 0xAE commands instead
std::vector<u8> temp_eeprom(m_eeprom_size);
for (u32 index = 0; index < (m_eeprom_size / 8); index++)
{
u64 NewVal = ((u64*)(m_eeprom.data()))[index];
for (u32 indexb = 0; indexb < 8; indexb++)
temp_eeprom[index * 8 + (7 - indexb)] = (NewVal >> (indexb * 8)) & 0xFF;
}
pStream.WriteBytes(temp_eeprom.data(), m_eeprom_size);
}
else
{
pStream.WriteBytes(m_eeprom.data(), m_eeprom_size);
}
}
}
u32 CEXIAgp::ImmRead(u32 _uSize)
{
u32 uData = 0;
u8 RomVal1, RomVal2, RomVal3, RomVal4;
switch (m_current_cmd)
{
case 0xAE000000: // Clock handshake?
uData = 0x5AAA5517; // 17 is precalculated hash
m_current_cmd = 0;
break;
case 0xAE010000: // Init?
uData = (m_return_pos == 0) ? 0x01020304 :
0xF0020304; // F0 is precalculated hash, 020304 is left over
if (m_return_pos == 1)
m_current_cmd = 0;
else
m_return_pos = 1;
break;
case 0xAE020000: // Read 2 bytes with 24 bit address
if (m_eeprom_write_status && ((m_rw_offset & m_eeprom_status_mask) == m_eeprom_status_mask) &&
(m_eeprom_status_mask != 0))
{
RomVal1 = 0x1;
RomVal2 = 0x0;
}
else
{
RomVal1 = m_rom[(m_rw_offset++) & m_rom_mask];
RomVal2 = m_rom[(m_rw_offset++) & m_rom_mask];
}
CRC8(&RomVal2, 1);
CRC8(&RomVal1, 1);
uData = (RomVal2 << 24) | (RomVal1 << 16) | (m_hash << 8);
m_current_cmd = 0;
break;
case 0xAE030000: // read the next 4 bytes out of 0x10000 group
if (_uSize == 1)
{
uData = 0xFF000000;
m_current_cmd = 0;
}
else
{
RomVal1 = m_rom[(m_rw_offset++) & m_rom_mask];
RomVal2 = m_rom[(m_rw_offset++) & m_rom_mask];
RomVal3 = m_rom[(m_rw_offset++) & m_rom_mask];
RomVal4 = m_rom[(m_rw_offset++) & m_rom_mask];
CRC8(&RomVal2, 1);
CRC8(&RomVal1, 1);
CRC8(&RomVal4, 1);
CRC8(&RomVal3, 1);
uData = (RomVal2 << 24) | (RomVal1 << 16) | (RomVal4 << 8) | (RomVal3);
}
break;
case 0xAE040000: // read 1 byte from 16 bit address
// ToDo: Flash special handling
if (m_eeprom_size == 0)
RomVal1 = 0xFF;
else
RomVal1 = (m_eeprom.data())[m_eeprom_pos];
CRC8(&RomVal1, 1);
uData = (RomVal1 << 24) | (m_hash << 16);
m_current_cmd = 0;
break;
case 0xAE0B0000: // read 1 bit from DMA with 6 or 14 bit address
// Change to byte access instead of endian file access?
RomVal1 = EE_READ_FALSE;
if ((m_eeprom_size != 0) && (m_eeprom_pos >= EE_IGNORE_BITS) &&
((((u64*)m_eeprom.data())[(m_eeprom_cmd >> 1) & m_eeprom_add_mask]) >>
((EE_DATA_BITS - 1) - (m_eeprom_pos - EE_IGNORE_BITS))) &
0x1)
{
RomVal1 = EE_READ_TRUE;
}
RomVal2 = 0;
CRC8(&RomVal2, 1);
CRC8(&RomVal1, 1);
uData = (RomVal2 << 24) | (RomVal1 << 16) | (m_hash << 8);
m_eeprom_pos++;
m_current_cmd = 0;
break;
case 0xAE070000: // complete write 1 byte from 16 bit address
case 0xAE0C0000: // complete write 1 bit from dma with 6 or 14 bit address
uData = m_hash << 24;
m_current_cmd = 0;
break;
default:
uData = 0x0;
m_current_cmd = 0;
break;
}
DEBUG_LOG(EXPANSIONINTERFACE, "AGP read %x", uData);
return uData;
}
void CEXIAgp::ImmWrite(u32 _uData, u32 _uSize)
{
// 0x00 = Execute current command?
if ((_uSize == 1) && ((_uData & 0xFF000000) == 0))
return;
u8 HashCmd;
u64 Mask;
DEBUG_LOG(EXPANSIONINTERFACE, "AGP command %x", _uData);
switch (m_current_cmd)
{
case 0xAE020000: // set up 24 bit address for read 2 bytes
case 0xAE030000: // set up 24 bit address for read (0x10000 byte group)
// 25 bit address shifted one bit right = 24 bits
m_rw_offset = ((_uData & 0xFFFFFF00) >> (8 - 1));
m_return_pos = 0;
HashCmd = (_uData & 0xFF000000) >> 24;
CRC8(&HashCmd, 1);
HashCmd = (_uData & 0x00FF0000) >> 16;
CRC8(&HashCmd, 1);
HashCmd = (_uData & 0x0000FF00) >> 8;
CRC8(&HashCmd, 1);
break;
case 0xAE040000: // set up 16 bit address for read 1 byte
// ToDo: Flash special handling
m_eeprom_pos = ((_uData & 0xFFFF0000) >> 0x10) & m_eeprom_mask;
HashCmd = (_uData & 0xFF000000) >> 24;
CRC8(&HashCmd, 1);
HashCmd = (_uData & 0x00FF0000) >> 16;
CRC8(&HashCmd, 1);
break;
case 0xAE070000: // write 1 byte from 16 bit address
// ToDo: Flash special handling
m_eeprom_pos = ((_uData & 0xFFFF0000) >> 0x10) & m_eeprom_mask;
if (m_eeprom_size != 0)
((m_eeprom.data()))[(m_eeprom_pos)] = (_uData & 0x0000FF00) >> 0x8;
HashCmd = (_uData & 0xFF000000) >> 24;
CRC8(&HashCmd, 1);
HashCmd = (_uData & 0x00FF0000) >> 16;
CRC8(&HashCmd, 1);
HashCmd = (_uData & 0x0000FF00) >> 8;
CRC8(&HashCmd, 1);
break;
case 0xAE0C0000: // write 1 bit from dma with 6 or 14 bit address
if ((m_eeprom_pos < m_eeprom_add_end) ||
(m_eeprom_pos == ((m_eeprom_cmd & m_eeprom_read_mask) ? m_eeprom_add_end :
m_eeprom_add_end + EE_DATA_BITS)))
{
Mask = (1ULL << (m_eeprom_add_end - std::min(m_eeprom_pos, m_eeprom_add_end)));
if ((_uData >> 16) & 0x1)
m_eeprom_cmd |= Mask;
else
m_eeprom_cmd &= ~Mask;
if (m_eeprom_pos == m_eeprom_add_end + EE_DATA_BITS)
{
// Change to byte access instead of endian file access?
if (m_eeprom_size != 0)
((u64*)(m_eeprom.data()))[(m_eeprom_cmd >> 1) & m_eeprom_add_mask] = m_eeprom_data;
m_eeprom_write_status = true;
}
}
else
{
Mask = (1ULL << (m_eeprom_add_end + EE_DATA_BITS - 1 - m_eeprom_pos));
if ((_uData >> 16) & 0x1)
m_eeprom_data |= Mask;
else
m_eeprom_data &= ~Mask;
}
m_eeprom_pos++;
m_return_pos = 0;
HashCmd = (_uData & 0xFF000000) >> 24;
CRC8(&HashCmd, 1);
HashCmd = (_uData & 0x00FF0000) >> 16;
CRC8(&HashCmd, 1);
break;
case 0xAE0B0000:
m_eeprom_write_status = false;
break;
case 0xAE000000:
case 0xAE010000:
case 0xAE090000: // start DMA
m_eeprom_write_status = false; // ToDo: Verify with hardware which commands disable EEPROM CS
// Fall-through intentional
case 0xAE0A0000: // end DMA
m_eeprom_pos = 0;
// Fall-through intentional
default:
m_current_cmd = _uData;
m_return_pos = 0;
m_hash = 0xFF;
HashCmd = (_uData & 0x00FF0000) >> 16;
CRC8(&HashCmd, 1);
break;
}
}
void CEXIAgp::DoState(PointerWrap& p)
{
p.Do(m_slot);
p.Do(m_address);
p.Do(m_current_cmd);
p.Do(m_eeprom);
p.Do(m_eeprom_cmd);
p.Do(m_eeprom_data);
p.Do(m_eeprom_mask);
p.Do(m_eeprom_pos);
p.Do(m_eeprom_size);
p.Do(m_eeprom_add_end);
p.Do(m_eeprom_add_mask);
p.Do(m_eeprom_read_mask);
p.Do(m_eeprom_status_mask);
p.Do(m_eeprom_write_status);
p.Do(m_hash);
p.Do(m_position);
p.Do(m_return_pos);
p.Do(m_rom);
p.Do(m_rom_mask);
p.Do(m_rom_size);
p.Do(m_rw_offset);
}
} // namespace ExpansionInterface