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Simplify and fix track caching.

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This commit is contained in:
Thomas Harte 2023-12-01 23:35:11 -05:00
parent 7072a1661c
commit 691d1cce9e
1 changed files with 64 additions and 37 deletions
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101
Machines/PCCompatible/PCCompatible.cpp
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@ -134,7 +134,7 @@ class FloppyController {
break;
case Command::ReadData: {
printf("FDC: Read %d:%d at %d/%d\n", decoder_.target().drive, decoder_.target().head, decoder_.geometry().cylinder, decoder_.geometry().head);
printf("FDC: Read %d:%d at %d/%d/%d\n", decoder_.target().drive, decoder_.target().head, decoder_.geometry().cylinder, decoder_.geometry().head, decoder_.geometry().sector);
// log = true;
status_.begin(decoder_);
@ -142,7 +142,7 @@ class FloppyController {
// Search for a matching sector.
const auto target = decoder_.geometry();
bool found_sector = false;
for(auto &pair: drives_[decoder_.target().drive].cached_track) {
for(auto &pair: drives_[decoder_.target().drive].sectors(decoder_.target().head)) {
if(
(pair.second.address.track == target.cylinder) &&
(pair.second.address.sector == target.sector) &&
@ -168,6 +168,7 @@ class FloppyController {
decoder_.geometry().sector,
decoder_.geometry().size);
} else {
printf("FDC: didn't write in full\n");
// TODO: Overrun, presumably?
}
@ -176,6 +177,7 @@ class FloppyController {
}
if(!found_sector) {
printf("FDC: sector not found\n");
// TODO: there's more than this, I think.
status_.set(Intel::i8272::Status0::AbnormalTermination);
results_.serialise(
@ -194,8 +196,6 @@ class FloppyController {
case Command::Seek:
printf("FDC: Seek %d:%d to %d\n", decoder_.target().drive, decoder_.target().head, decoder_.seek_target());
drives_[decoder_.target().drive].track = decoder_.seek_target();
drives_[decoder_.target().drive].side = decoder_.target().head;
drives_[decoder_.target().drive].cache_track();
drives_[decoder_.target().drive].raised_interrupt = true;
drives_[decoder_.target().drive].status = decoder_.drive_head() | uint8_t(Intel::i8272::Status0::SeekEnded);
@ -204,7 +204,6 @@ class FloppyController {
case Command::Recalibrate:
printf("FDC: Recalibrate\n");
drives_[decoder_.target().drive].track = 0;
drives_[decoder_.target().drive].cache_track();
drives_[decoder_.target().drive].raised_interrupt = true;
drives_[decoder_.target().drive].status = decoder_.target().drive | uint8_t(Intel::i8272::Status0::SeekEnded);
@ -317,38 +316,54 @@ class FloppyController {
Intel::i8272::CommandDecoder::SpecifySpecs specify_specs_;
struct DriveStatus {
bool raised_interrupt = false;
uint8_t status = 0;
uint8_t track = 0;
bool side = false;
bool motor = false;
bool exists = true;
public:
bool raised_interrupt = false;
uint8_t status = 0;
uint8_t track = 0;
bool motor = false;
bool exists = true;
std::shared_ptr<Storage::Disk::Disk> disk;
Storage::Encodings::MFM::SectorMap cached_track;
void cache_track() {
if(!disk) {
return;
}
cached_track.clear();
std::shared_ptr<Storage::Disk::Disk> disk;
auto raw_track = disk->get_track_at_position(
Storage::Disk::Track::Address(
side,
Storage::Disk::HeadPosition(track)
)
);
if(!raw_track) {
return;
Storage::Encodings::MFM::SectorMap &sectors(bool side) {
if(cached.track == track && cached.side == side) {
return cached.sectors;
}
cached.track = track;
cached.side = side;
cached.sectors.clear();
if(!disk) {
return cached.sectors;
}
auto raw_track = disk->get_track_at_position(
Storage::Disk::Track::Address(
side,
Storage::Disk::HeadPosition(track)
)
);
if(!raw_track) {
return cached.sectors;
}
const bool is_double_density = true; // TODO: use MFM flag here.
auto serialisation = Storage::Disk::track_serialisation(
*raw_track,
is_double_density ? Storage::Encodings::MFM::MFMBitLength : Storage::Encodings::MFM::FMBitLength
);
cached.sectors = Storage::Encodings::MFM::sectors_from_segment(std::move(serialisation), is_double_density);
return cached.sectors;
}
const bool is_double_density = true; // TODO: use MFM flag here.
auto serialisation = Storage::Disk::track_serialisation(
*raw_track,
is_double_density ? Storage::Encodings::MFM::MFMBitLength : Storage::Encodings::MFM::FMBitLength
);
cached_track = Storage::Encodings::MFM::sectors_from_segment(std::move(serialisation), is_double_density);
}
private:
struct {
uint8_t track = 0xff;
bool side;
Storage::Encodings::MFM::SectorMap sectors;
} cached;
} drives_[4];
static std::string drive_name(int c) {
@ -1105,13 +1120,25 @@ class ConcreteMachine:
context.flow_controller.begin_instruction();
}
// if(log) {
// const auto next = to_string(decoded, InstructionSet::x86::Model::i8086);
/* if(decoded_ip_ >= 0x7c00 && decoded_ip_ < 0x7c00 + 1024) {
const auto next = to_string(decoded, InstructionSet::x86::Model::i8086);
// if(next != previous) {
// std::cout << decoded_ip_ << " " << next << std::endl;
std::cout << std::hex << decoded_ip_ << " " << next;
if(decoded.second.operation() == InstructionSet::x86::Operation::INT) {
std::cout << " dl:" << std::hex << +context.registers.dl() << "; ";
std::cout << "ah:" << std::hex << +context.registers.ah() << "; ";
std::cout << "ch:" << std::hex << +context.registers.ch() << "; ";
std::cout << "cl:" << std::hex << +context.registers.cl() << "; ";
std::cout << "dh:" << std::hex << +context.registers.dh() << "; ";
std::cout << "es:" << std::hex << +context.registers.es() << "; ";
std::cout << "bx:" << std::hex << +context.registers.bx();
}
std::cout << std::endl;
// previous = next;
// }
// }
}*/
// Execute it.
InstructionSet::x86::perform(