forked from dolphin-emu/dolphin
/
EXI_DeviceEthernet.cpp
595 lines (505 loc) · 14.1 KB
/
EXI_DeviceEthernet.cpp
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// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "Core/HW/EXI/EXI_DeviceEthernet.h"
#include <memory>
#include <string>
#include "Common/ChunkFile.h"
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
#include "Common/Network.h"
#include "Core/ConfigManager.h"
#include "Core/CoreTiming.h"
#include "Core/HW/EXI/EXI.h"
#include "Core/HW/Memmap.h"
namespace ExpansionInterface
{
// XXX: The BBA stores multi-byte elements as little endian.
// Multiple parts of this implementation depend on Dolphin
// being compiled for a little endian host.
CEXIETHERNET::CEXIETHERNET()
{
tx_fifo = std::make_unique<u8[]>(BBA_TXFIFO_SIZE);
mBbaMem = std::make_unique<u8[]>(BBA_MEM_SIZE);
mRecvBuffer = std::make_unique<u8[]>(BBA_RECV_SIZE);
mRecvBufferLength = 0;
MXHardReset();
// Parse MAC address from config, and generate a new one if it doesn't
// exist or can't be parsed.
std::string& mac_addr_setting = SConfig::GetInstance().m_bba_mac;
u8 mac_addr[Common::MAC_ADDRESS_SIZE] = {0};
if (!Common::StringToMacAddress(mac_addr_setting, mac_addr))
{
Common::GenerateMacAddress(Common::MACConsumer::BBA, mac_addr);
mac_addr_setting = Common::MacAddressToString(mac_addr);
SConfig::GetInstance().SaveSettings();
}
memcpy(&mBbaMem[BBA_NAFR_PAR0], mac_addr, Common::MAC_ADDRESS_SIZE);
// HACK: .. fully established 100BASE-T link
mBbaMem[BBA_NWAYS] = NWAYS_LS100 | NWAYS_LPNWAY | NWAYS_100TXF | NWAYS_ANCLPT;
#if defined(_WIN32)
mHAdapter = INVALID_HANDLE_VALUE;
memset(&mReadOverlapped, 0, sizeof(mReadOverlapped));
memset(&mWriteOverlapped, 0, sizeof(mWriteOverlapped));
mWritePending = false;
#elif defined(__linux__) || defined(__APPLE__)
fd = -1;
#endif
}
CEXIETHERNET::~CEXIETHERNET()
{
Deactivate();
}
void CEXIETHERNET::SetCS(int cs)
{
if (cs)
{
// Invalidate the previous transfer
transfer.valid = false;
}
}
bool CEXIETHERNET::IsPresent() const
{
return true;
}
bool CEXIETHERNET::IsInterruptSet()
{
return !!(exi_status.interrupt & exi_status.interrupt_mask);
}
void CEXIETHERNET::ImmWrite(u32 data, u32 size)
{
data >>= (4 - size) * 8;
if (!transfer.valid)
{
transfer.valid = true;
transfer.region = IsMXCommand(data) ? transfer.MX : transfer.EXI;
if (transfer.region == transfer.EXI)
transfer.address = ((data & ~0xc000) >> 8) & 0xff;
else
transfer.address = (data >> 8) & 0xffff;
transfer.direction = IsWriteCommand(data) ? transfer.WRITE : transfer.READ;
DEBUG_LOG(SP1, "%s %s %s %x", IsMXCommand(data) ? "mx " : "exi",
IsWriteCommand(data) ? "write" : "read ", GetRegisterName(), transfer.address);
if (transfer.address == BBA_IOB && transfer.region == transfer.MX)
{
ERROR_LOG(SP1, "Usage of BBA_IOB indicates that the rx packet descriptor has been corrupted. "
"Killing Dolphin...");
exit(0);
}
// transfer has been setup
return;
}
// Reach here if we're actually writing data to the EXI or MX region.
DEBUG_LOG(SP1, "%s write %0*x", transfer.region == transfer.MX ? "mx " : "exi", size * 2, data);
if (transfer.region == transfer.EXI)
{
switch (transfer.address)
{
case INTERRUPT:
exi_status.interrupt &= data ^ 0xff;
break;
case INTERRUPT_MASK:
exi_status.interrupt_mask = data;
break;
}
ExpansionInterface::UpdateInterrupts();
}
else
{
MXCommandHandler(data, size);
}
}
u32 CEXIETHERNET::ImmRead(u32 size)
{
u32 ret = 0;
if (transfer.region == transfer.EXI)
{
switch (transfer.address)
{
case EXI_ID:
ret = EXI_DEVTYPE_ETHER;
break;
case REVISION_ID:
ret = exi_status.revision_id;
break;
case DEVICE_ID:
ret = exi_status.device_id;
break;
case ACSTART:
ret = exi_status.acstart;
break;
case INTERRUPT:
ret = exi_status.interrupt;
break;
}
transfer.address += size;
}
else
{
for (int i = size - 1; i >= 0; i--)
ret |= mBbaMem[transfer.address++] << (i * 8);
}
DEBUG_LOG(SP1, "imm r%i: %0*x", size, size * 2, ret);
ret <<= (4 - size) * 8;
return ret;
}
void CEXIETHERNET::DMAWrite(u32 addr, u32 size)
{
DEBUG_LOG(SP1, "DMA write: %08x %x", addr, size);
if (transfer.region == transfer.MX && transfer.direction == transfer.WRITE &&
transfer.address == BBA_WRTXFIFOD)
{
DirectFIFOWrite(Memory::GetPointer(addr), size);
}
else
{
ERROR_LOG(SP1, "DMA write in %s %s mode - not implemented",
transfer.region == transfer.EXI ? "exi" : "mx",
transfer.direction == transfer.READ ? "read" : "write");
}
}
void CEXIETHERNET::DMARead(u32 addr, u32 size)
{
DEBUG_LOG(SP1, "DMA read: %08x %x", addr, size);
Memory::CopyToEmu(addr, &mBbaMem[transfer.address], size);
transfer.address += size;
}
void CEXIETHERNET::DoState(PointerWrap& p)
{
p.DoArray(tx_fifo.get(), BBA_TXFIFO_SIZE);
p.DoArray(mBbaMem.get(), BBA_MEM_SIZE);
}
bool CEXIETHERNET::IsMXCommand(u32 const data)
{
return !!(data & (1 << 31));
}
bool CEXIETHERNET::IsWriteCommand(u32 const data)
{
return IsMXCommand(data) ? !!(data & (1 << 30)) : !!(data & (1 << 14));
}
const char* CEXIETHERNET::GetRegisterName() const
{
#define STR_RETURN(x) \
case x: \
return #x;
if (transfer.region == transfer.EXI)
{
switch (transfer.address)
{
STR_RETURN(EXI_ID)
STR_RETURN(REVISION_ID)
STR_RETURN(INTERRUPT)
STR_RETURN(INTERRUPT_MASK)
STR_RETURN(DEVICE_ID)
STR_RETURN(ACSTART)
STR_RETURN(HASH_READ)
STR_RETURN(HASH_WRITE)
STR_RETURN(HASH_STATUS)
STR_RETURN(RESET)
default:
return "unknown";
}
}
else
{
switch (transfer.address)
{
STR_RETURN(BBA_NCRA)
STR_RETURN(BBA_NCRB)
STR_RETURN(BBA_LTPS)
STR_RETURN(BBA_LRPS)
STR_RETURN(BBA_IMR)
STR_RETURN(BBA_IR)
STR_RETURN(BBA_BP)
STR_RETURN(BBA_TLBP)
STR_RETURN(BBA_TWP)
STR_RETURN(BBA_IOB)
STR_RETURN(BBA_TRP)
STR_RETURN(BBA_RWP)
STR_RETURN(BBA_RRP)
STR_RETURN(BBA_RHBP)
STR_RETURN(BBA_RXINTT)
STR_RETURN(BBA_NAFR_PAR0)
STR_RETURN(BBA_NAFR_PAR1)
STR_RETURN(BBA_NAFR_PAR2)
STR_RETURN(BBA_NAFR_PAR3)
STR_RETURN(BBA_NAFR_PAR4)
STR_RETURN(BBA_NAFR_PAR5)
STR_RETURN(BBA_NAFR_MAR0)
STR_RETURN(BBA_NAFR_MAR1)
STR_RETURN(BBA_NAFR_MAR2)
STR_RETURN(BBA_NAFR_MAR3)
STR_RETURN(BBA_NAFR_MAR4)
STR_RETURN(BBA_NAFR_MAR5)
STR_RETURN(BBA_NAFR_MAR6)
STR_RETURN(BBA_NAFR_MAR7)
STR_RETURN(BBA_NWAYC)
STR_RETURN(BBA_NWAYS)
STR_RETURN(BBA_GCA)
STR_RETURN(BBA_MISC)
STR_RETURN(BBA_TXFIFOCNT)
STR_RETURN(BBA_WRTXFIFOD)
STR_RETURN(BBA_MISC2)
STR_RETURN(BBA_SI_ACTRL)
STR_RETURN(BBA_SI_STATUS)
STR_RETURN(BBA_SI_ACTRL2)
default:
if (transfer.address >= 0x100 && transfer.address <= 0xfff)
return "packet buffer";
else
return "unknown";
}
}
#undef STR_RETURN
}
void CEXIETHERNET::MXHardReset()
{
memset(mBbaMem.get(), 0, BBA_MEM_SIZE);
mBbaMem[BBA_NCRB] = NCRB_PR;
mBbaMem[BBA_NWAYC] = NWAYC_LTE | NWAYC_ANE;
mBbaMem[BBA_MISC] = MISC1_TPF | MISC1_TPH | MISC1_TXF | MISC1_TXH;
}
void CEXIETHERNET::MXCommandHandler(u32 data, u32 size)
{
switch (transfer.address)
{
case BBA_NCRA:
if (data & NCRA_RESET)
{
INFO_LOG(SP1, "Software reset");
// MXSoftReset();
Activate();
}
if ((mBbaMem[BBA_NCRA] & NCRA_SR) ^ (data & NCRA_SR))
{
DEBUG_LOG(SP1, "%s rx", (data & NCRA_SR) ? "start" : "stop");
if (data & NCRA_SR)
RecvStart();
else
RecvStop();
}
// Only start transfer if there isn't one currently running
if (!(mBbaMem[BBA_NCRA] & (NCRA_ST0 | NCRA_ST1)))
{
// Technically transfer DMA status is kept in TXDMA - not implemented
if (data & NCRA_ST0)
{
INFO_LOG(SP1, "start tx - local DMA");
SendFromPacketBuffer();
}
else if (data & NCRA_ST1)
{
DEBUG_LOG(SP1, "start tx - direct FIFO");
SendFromDirectFIFO();
// Kind of a hack: send completes instantly, so we don't
// actually write the "send in status" bit to the register
data &= ~NCRA_ST1;
}
}
goto write_to_register;
case BBA_WRTXFIFOD:
if (size == 2)
data = Common::swap16(data & 0xffff);
else if (size == 3)
data = Common::swap32(data & 0xffffff) >> 8;
else if (size == 4)
data = Common::swap32(data);
DirectFIFOWrite((u8*)&data, size);
// Do not increment address
return;
case BBA_IR:
data &= (data & 0xff) ^ 0xff;
goto write_to_register;
case BBA_TXFIFOCNT:
case BBA_TXFIFOCNT + 1:
// Ignore all writes to BBA_TXFIFOCNT
transfer.address += size;
return;
write_to_register:
default:
for (int i = size - 1; i >= 0; i--)
{
mBbaMem[transfer.address++] = (data >> (i * 8)) & 0xff;
}
return;
}
}
void CEXIETHERNET::DirectFIFOWrite(const u8* data, u32 size)
{
// In direct mode, the hardware handles creating the state required by the
// GMAC instead of finagling with packet descriptors and such
u16* tx_fifo_count = (u16*)&mBbaMem[BBA_TXFIFOCNT];
memcpy(tx_fifo.get() + *tx_fifo_count, data, size);
*tx_fifo_count += size;
// TODO: not sure this mask is correct.
// However, BBA_TXFIFOCNT should never get even close to this amount,
// so it shouldn't matter
*tx_fifo_count &= (1 << 12) - 1;
}
void CEXIETHERNET::SendFromDirectFIFO()
{
SendFrame(tx_fifo.get(), *(u16*)&mBbaMem[BBA_TXFIFOCNT]);
}
void CEXIETHERNET::SendFromPacketBuffer()
{
ERROR_LOG(SP1, "tx packet buffer not implemented.");
}
void CEXIETHERNET::SendComplete()
{
mBbaMem[BBA_NCRA] &= ~(NCRA_ST0 | NCRA_ST1);
*(u16*)&mBbaMem[BBA_TXFIFOCNT] = 0;
if (mBbaMem[BBA_IMR] & INT_T)
{
mBbaMem[BBA_IR] |= INT_T;
exi_status.interrupt |= exi_status.TRANSFER;
ExpansionInterface::ScheduleUpdateInterrupts(CoreTiming::FromThread::CPU, 0);
}
mBbaMem[BBA_LTPS] = 0;
}
inline u8 CEXIETHERNET::HashIndex(const u8* dest_eth_addr)
{
// Calculate CRC
u32 crc = 0xffffffff;
for (size_t byte_num = 0; byte_num < 6; ++byte_num)
{
u8 cur_byte = dest_eth_addr[byte_num];
for (size_t bit = 0; bit < 8; ++bit)
{
u8 carry = ((crc >> 31) & 1) ^ (cur_byte & 1);
crc <<= 1;
cur_byte >>= 1;
if (carry)
crc = (crc ^ 0x4c11db6) | carry;
}
}
// return bits used as index
return crc >> 26;
}
inline bool CEXIETHERNET::RecvMACFilter()
{
static u8 const broadcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
// Accept all destination addrs?
if (mBbaMem[BBA_NCRB] & NCRB_PR)
return true;
// Unicast?
if ((mRecvBuffer[0] & 0x01) == 0)
{
return memcmp(mRecvBuffer.get(), &mBbaMem[BBA_NAFR_PAR0], 6) == 0;
}
else if (memcmp(mRecvBuffer.get(), broadcast, 6) == 0)
{
// Accept broadcast?
return !!(mBbaMem[BBA_NCRB] & NCRB_AB);
}
else if (mBbaMem[BBA_NCRB] & NCRB_PM)
{
// Accept all multicast
return true;
}
else
{
// Lookup the dest eth address in the hashmap
u16 index = HashIndex(mRecvBuffer.get());
return !!(mBbaMem[BBA_NAFR_MAR0 + index / 8] & (1 << (index % 8)));
}
}
inline void CEXIETHERNET::inc_rwp()
{
u16* rwp = (u16*)&mBbaMem[BBA_RWP];
if (*rwp + 1 == page_ptr(BBA_RHBP))
*rwp = page_ptr(BBA_BP);
else
(*rwp)++;
}
// This function is on the critical path for receiving data.
// Be very careful about calling into the logger and other slow things
bool CEXIETHERNET::RecvHandlePacket()
{
u8* write_ptr;
u8* end_ptr;
u8* read_ptr;
Descriptor* descriptor;
u32 status = 0;
u16 rwp_initial = page_ptr(BBA_RWP);
if (!RecvMACFilter())
goto wait_for_next;
#ifdef BBA_TRACK_PAGE_PTRS
INFO_LOG(SP1, "RecvHandlePacket %x\n%s", mRecvBufferLength,
ArrayToString(mRecvBuffer, mRecvBufferLength, 0x100).c_str());
INFO_LOG(SP1, "%x %x %x %x", page_ptr(BBA_BP), page_ptr(BBA_RRP), page_ptr(BBA_RWP),
page_ptr(BBA_RHBP));
#endif
write_ptr = ptr_from_page_ptr(BBA_RWP);
end_ptr = ptr_from_page_ptr(BBA_RHBP);
read_ptr = ptr_from_page_ptr(BBA_RRP);
descriptor = (Descriptor*)write_ptr;
write_ptr += 4;
for (u32 i = 0, off = 4; i < mRecvBufferLength; ++i, ++off)
{
*write_ptr++ = mRecvBuffer[i];
if (off == 0xff)
{
off = 0;
inc_rwp();
}
if (write_ptr == end_ptr)
write_ptr = ptr_from_page_ptr(BBA_BP);
if (write_ptr == read_ptr)
{
/*
halt copy
if (cur_packet_size >= PAGE_SIZE)
desc.status |= FO | BF
if (RBFIM)
raise RBFI
if (AUTORCVR)
discard bad packet
else
inc MPC instead of receiving packets
*/
status |= DESC_FO | DESC_BF;
mBbaMem[BBA_IR] |= mBbaMem[BBA_IMR] & INT_RBF;
break;
}
}
// Align up to next page
if ((mRecvBufferLength + 4) % 256)
inc_rwp();
#ifdef BBA_TRACK_PAGE_PTRS
INFO_LOG(SP1, "%x %x %x %x", page_ptr(BBA_BP), page_ptr(BBA_RRP), page_ptr(BBA_RWP),
page_ptr(BBA_RHBP));
#endif
// Is the current frame multicast?
if (mRecvBuffer[0] & 0x01)
status |= DESC_MF;
if (status & DESC_BF)
{
if (mBbaMem[BBA_MISC2] & MISC2_AUTORCVR)
{
*(u16*)&mBbaMem[BBA_RWP] = rwp_initial;
}
else
{
ERROR_LOG(SP1, "RBF while AUTORCVR == 0!");
}
}
descriptor->set(*(u16*)&mBbaMem[BBA_RWP], 4 + mRecvBufferLength, status);
mBbaMem[BBA_LRPS] = status;
// Raise interrupt
if (mBbaMem[BBA_IMR] & INT_R)
{
mBbaMem[BBA_IR] |= INT_R;
exi_status.interrupt |= exi_status.TRANSFER;
ExpansionInterface::ScheduleUpdateInterrupts(CoreTiming::FromThread::NON_CPU, 0);
}
else
{
// This occurs if software is still processing the last raised recv interrupt
WARN_LOG(SP1, "NOT raising recv interrupt");
}
wait_for_next:
if (mBbaMem[BBA_NCRA] & NCRA_SR)
RecvStart();
return true;
}
} // namespace ExpansionInterface