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Merge pull request #4883 from JosJuice/dvd-timing-address-translation-2

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DVDInterface: Translate Wii partition offsets for timing purposes
This commit is contained in:
JosJuice 2017-02-15 21:12:42 +01:00 committed by GitHub
commit f80f7b6f9c
4 changed files with 57 additions and 39 deletions
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62
Source/Core/Core/HW/DVDInterface.cpp
View File

@ -2,6 +2,7 @@
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <algorithm>
#include <cinttypes>
#include <cmath>
#include <memory>
@ -31,6 +32,7 @@
#include "DiscIO/Enums.h"
#include "DiscIO/Volume.h"
#include "DiscIO/VolumeCreator.h"
#include "DiscIO/VolumeWiiCrypted.h"
// The minimum time it takes for the DVD drive to process a command (in
// microseconds)
@ -273,8 +275,7 @@ bool ExecuteReadCommand(u64 DVD_offset, u32 output_address, u32 DVD_length, u32
u64 PackFinishExecutingCommandUserdata(ReplyType reply_type, DIInterruptType interrupt_type);
void ScheduleReads(u64 dvd_offset, u32 length, bool decrypt, u32 output_address,
ReplyType reply_type);
void ScheduleReads(u64 offset, u32 length, bool decrypt, u32 output_address, ReplyType reply_type);
double CalculatePhysicalDiscPosition(u64 offset);
u64 CalculateSeekTime(u64 offset_from, u64 offset_to);
u64 CalculateRawDiscReadTime(u64 offset, u64 length);
@ -1174,8 +1175,7 @@ void FinishExecutingCommand(ReplyType reply_type, DIInterruptType interrupt_type
// Determines from a given read request how much of the request is buffered,
// and how much is required to be read from disc.
void ScheduleReads(u64 dvd_offset, u32 dvd_length, bool decrypt, u32 output_address,
ReplyType reply_type)
void ScheduleReads(u64 offset, u32 length, bool decrypt, u32 output_address, ReplyType reply_type)
{
// The drive continues to read 1 MiB beyond the last read position when idle.
// If a future read falls within this window, part of the read may be returned
@ -1196,6 +1196,15 @@ void ScheduleReads(u64 dvd_offset, u32 dvd_length, bool decrypt, u32 output_addr
// If we fall within its bounds, we get DMA-speed reads.
u64 buffer_start, buffer_end;
// The variable offset uses the same addressing as games do.
// The variable dvd_offset tracks the actual offset on the DVD
// that the disc drive starts reading at, which differs in two ways:
// It's rounded to a whole ECC block and never uses Wii partition addressing.
u64 dvd_offset = offset;
if (decrypt)
dvd_offset = s_inserted_volume->PartitionOffsetToRawOffset(offset);
dvd_offset = Common::AlignDown(dvd_offset, DVD_ECC_BLOCK_SIZE);
if (SConfig::GetInstance().bFastDiscSpeed)
{
// The SUDTR setting makes us act as if all reads are buffered
@ -1250,8 +1259,8 @@ void ScheduleReads(u64 dvd_offset, u32 dvd_length, bool decrypt, u32 output_addr
buffer_start, buffer_end, buffer_end - buffer_start);
DEBUG_LOG(DVDINTERFACE,
"Schedule reads: offset=0x%" PRIx64 " length=0x%" PRIx32 " address=0x%" PRIx32,
dvd_offset, dvd_length, output_address);
"Schedule reads: offset=0x%" PRIx64 " length=0x%" PRIx32 " address=0x%" PRIx32, offset,
length, output_address);
// The DVD drive's minimum turnaround time on a command, based on a hardware test.
s64 ticks_until_completion = COMMAND_LATENCY_US * (SystemTimers::GetTicksPerSecond() / 1000000);
@ -1259,23 +1268,23 @@ void ScheduleReads(u64 dvd_offset, u32 dvd_length, bool decrypt, u32 output_addr
u32 buffered_blocks = 0;
u32 unbuffered_blocks = 0;
while (dvd_length > 0)
{
// Where the read actually takes place on disc
u64 rounded_offset = Common::AlignDown(dvd_offset, DVD_ECC_BLOCK_SIZE);
const u32 bytes_per_chunk =
decrypt ? DiscIO::CVolumeWiiCrypted::BLOCK_DATA_SIZE : DVD_ECC_BLOCK_SIZE;
while (length > 0)
{
// The length of this read - "+1" so that if this read is already
// aligned to an ECC block we'll read the entire block.
u32 chunk_length =
static_cast<u32>(Common::AlignUp(dvd_offset + 1, DVD_ECC_BLOCK_SIZE) - dvd_offset);
// aligned to a block we'll read the entire block.
u32 chunk_length = static_cast<u32>(Common::AlignUp(offset + 1, bytes_per_chunk) - offset);
// The last chunk may be short
if (chunk_length > dvd_length)
chunk_length = dvd_length;
chunk_length = std::min(chunk_length, length);
if (rounded_offset >= buffer_start && rounded_offset < buffer_end)
if (dvd_offset >= buffer_start && dvd_offset < buffer_end)
{
// Number of ticks it takes to transfer the data from the buffer to memory.
// TODO: This calculation is slightly wrong when decrypt is true - it uses the size of
// the copy from IOS to PPC but is supposed to model the copy from the disc drive to IOS.
ticks_until_completion +=
static_cast<u64>(chunk_length) * SystemTimers::GetTicksPerSecond() / BUFFER_TRANSFER_RATE;
buffered_blocks++;
@ -1284,39 +1293,40 @@ void ScheduleReads(u64 dvd_offset, u32 dvd_length, bool decrypt, u32 output_addr
{
// In practice we'll only ever seek if this is the first time
// through this loop.
if (rounded_offset != head_position)
if (dvd_offset != head_position)
{
// Unbuffered seek+read
ticks_until_completion += CalculateSeekTime(head_position, rounded_offset);
ticks_until_completion += CalculateSeekTime(head_position, dvd_offset);
DEBUG_LOG(DVDINTERFACE, "Seek+read 0x%" PRIx32 " bytes @ 0x%" PRIx64 " ticks=%" PRId64,
chunk_length, rounded_offset, ticks_until_completion);
chunk_length, offset, ticks_until_completion);
}
else
{
// Unbuffered read
ticks_until_completion += CalculateRawDiscReadTime(rounded_offset, DVD_ECC_BLOCK_SIZE);
ticks_until_completion += CalculateRawDiscReadTime(dvd_offset, DVD_ECC_BLOCK_SIZE);
}
unbuffered_blocks++;
head_position = rounded_offset + DVD_ECC_BLOCK_SIZE;
head_position = dvd_offset + DVD_ECC_BLOCK_SIZE;
}
// Schedule this read to complete at the appropriate time
const ReplyType chunk_reply_type = chunk_length == dvd_length ? reply_type : ReplyType::NoReply;
DVDThread::StartReadToEmulatedRAM(output_address, dvd_offset, chunk_length, decrypt,
const ReplyType chunk_reply_type = chunk_length == length ? reply_type : ReplyType::NoReply;
DVDThread::StartReadToEmulatedRAM(output_address, offset, chunk_length, decrypt,
chunk_reply_type, ticks_until_completion);
// Advance the read window
output_address += chunk_length;
dvd_offset += chunk_length;
dvd_length -= chunk_length;
offset += chunk_length;
length -= chunk_length;
dvd_offset += DVD_ECC_BLOCK_SIZE;
}
// Update the buffer based on this read. Based on experimental testing,
// we will only reuse the old buffer while reading forward. Note that the
// buffer start we calculate here is not the actual start of the buffer -
// it is just the start of the portion we need to read.
u64 last_block = Common::AlignUp(dvd_offset, DVD_ECC_BLOCK_SIZE);
const u64 last_block = dvd_offset;
if (last_block == buffer_start + DVD_ECC_BLOCK_SIZE && buffer_start != buffer_end)
{
// Special case: reading less than one block at the start of the

1
Source/Core/DiscIO/Volume.h
View File

@ -37,6 +37,7 @@ public:
virtual bool GetTitleID(u64*) const { return false; }
virtual std::vector<u8> GetTMD() const { return {}; }
virtual u64 PartitionOffsetToRawOffset(u64 offset) const { return offset; }
virtual std::string GetGameID() const = 0;
virtual std::string GetMakerID() const = 0;
virtual u16 GetRevision() const = 0;

22
Source/Core/DiscIO/VolumeWiiCrypted.cpp
View File

@ -60,26 +60,26 @@ bool CVolumeWiiCrypted::Read(u64 _ReadOffset, u64 _Length, u8* _pBuffer, bool de
FileMon::FindFilename(_ReadOffset);
std::vector<u8> read_buffer(s_block_total_size);
std::vector<u8> read_buffer(BLOCK_TOTAL_SIZE);
while (_Length > 0)
{
// Calculate block offset
u64 Block = _ReadOffset / s_block_data_size;
u64 Offset = _ReadOffset % s_block_data_size;
u64 Block = _ReadOffset / BLOCK_DATA_SIZE;
u64 Offset = _ReadOffset % BLOCK_DATA_SIZE;
if (m_LastDecryptedBlockOffset != Block)
{
// Read the current block
if (!m_pReader->Read(m_VolumeOffset + m_dataOffset + Block * s_block_total_size,
s_block_total_size, read_buffer.data()))
if (!m_pReader->Read(m_VolumeOffset + m_dataOffset + Block * BLOCK_TOTAL_SIZE,
BLOCK_TOTAL_SIZE, read_buffer.data()))
return false;
// Decrypt the block's data.
// 0x3D0 - 0x3DF in m_pBuffer will be overwritten,
// but that won't affect anything, because we won't
// use the content of m_pBuffer anymore after this
mbedtls_aes_crypt_cbc(m_AES_ctx.get(), MBEDTLS_AES_DECRYPT, s_block_data_size,
&read_buffer[0x3D0], &read_buffer[s_block_header_size],
mbedtls_aes_crypt_cbc(m_AES_ctx.get(), MBEDTLS_AES_DECRYPT, BLOCK_DATA_SIZE,
&read_buffer[0x3D0], &read_buffer[BLOCK_HEADER_SIZE],
m_LastDecryptedBlock);
m_LastDecryptedBlockOffset = Block;
@ -90,7 +90,7 @@ bool CVolumeWiiCrypted::Read(u64 _ReadOffset, u64 _Length, u8* _pBuffer, bool de
}
// Copy the decrypted data
u64 MaxSizeToCopy = s_block_data_size - Offset;
u64 MaxSizeToCopy = BLOCK_DATA_SIZE - Offset;
u64 CopySize = (_Length > MaxSizeToCopy) ? MaxSizeToCopy : _Length;
memcpy(_pBuffer, &m_LastDecryptedBlock[Offset], (size_t)CopySize);
@ -140,6 +140,12 @@ std::vector<u8> CVolumeWiiCrypted::GetTMD() const
return buffer;
}
u64 CVolumeWiiCrypted::PartitionOffsetToRawOffset(u64 offset) const
{
return m_VolumeOffset + m_dataOffset + (offset / BLOCK_DATA_SIZE * BLOCK_TOTAL_SIZE) +
(offset % BLOCK_DATA_SIZE);
}
std::string CVolumeWiiCrypted::GetGameID() const
{
if (m_pReader == nullptr)

11
Source/Core/DiscIO/VolumeWiiCrypted.h
View File

@ -32,6 +32,7 @@ public:
bool Read(u64 _Offset, u64 _Length, u8* _pBuffer, bool decrypt) const override;
bool GetTitleID(u64* buffer) const override;
std::vector<u8> GetTMD() const override;
u64 PartitionOffsetToRawOffset(u64 offset) const override;
std::string GetGameID() const override;
std::string GetMakerID() const override;
u16 GetRevision() const override;
@ -53,11 +54,11 @@ public:
u64 GetSize() const override;
u64 GetRawSize() const override;
private:
static const unsigned int s_block_header_size = 0x0400;
static const unsigned int s_block_data_size = 0x7C00;
static const unsigned int s_block_total_size = s_block_header_size + s_block_data_size;
static constexpr unsigned int BLOCK_HEADER_SIZE = 0x0400;
static constexpr unsigned int BLOCK_DATA_SIZE = 0x7C00;
static constexpr unsigned int BLOCK_TOTAL_SIZE = BLOCK_HEADER_SIZE + BLOCK_DATA_SIZE;
private:
std::unique_ptr<IBlobReader> m_pReader;
std::unique_ptr<mbedtls_aes_context> m_AES_ctx;
@ -65,7 +66,7 @@ private:
u64 m_dataOffset;
mutable u64 m_LastDecryptedBlockOffset;
mutable unsigned char m_LastDecryptedBlock[s_block_data_size];
mutable unsigned char m_LastDecryptedBlock[BLOCK_DATA_SIZE];
};
} // namespace