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Avoid potential infinite read loops.

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This commit is contained in:
Thomas Harte 2023-12-04 12:19:21 -05:00
parent 9b23984d35
commit edef0732ac
1 changed files with 25 additions and 31 deletions
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56
Machines/PCCompatible/PCCompatible.cpp
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@ -114,16 +114,15 @@ class FloppyController {
decoder_.geometry().head,
decoder_.geometry().cylinder,
decoder_.geometry().sector);
// log = true;
status_.begin(decoder_);
// Search for a matching sector.
auto target = decoder_.geometry();
// bool found_sector = false;
bool complete = false;
while(!complete) {
bool found_sector = false;
for(auto &pair: drives_[decoder_.target().drive].sectors(decoder_.target().head)) {
if(
(pair.second.address.track == target.cylinder) &&
@ -131,19 +130,15 @@ class FloppyController {
(pair.second.address.side == target.head) &&
(pair.second.size == target.size)
) {
// found_sector = true;
// bool wrote_in_full = true;
found_sector = true;
bool wrote_in_full = true;
printf("Writing data beginning: ");
for(int c = 0; c < 128 << target.size; c++) {
if(c < 8) printf("%02x ", pair.second.samples[0].data()[c]);
const auto access_result = dma_.write(2, pair.second.samples[0].data()[c]);
switch(access_result) {
default: break;
case AccessResult::NotAccepted:
printf("FDC: DMA not permitted\n");
// wrote_in_full = false;
wrote_in_full = false;
break;
case AccessResult::AcceptedWithEOP:
complete = true;
@ -154,18 +149,23 @@ class FloppyController {
}
}
++target.sector; // TODO: multitrack?
printf("\n");
if(!wrote_in_full) {
status_.set(Intel::i8272::Status1::OverRun);
status_.set(Intel::i8272::Status0::AbnormalTermination);
break;
}
// if(wrote_in_full) {
// } else {
// printf("FDC: didn't write in full\n");
// // TODO: Overrun, presumably?
// }
++target.sector; // TODO: multitrack?
break;
}
}
if(!found_sector) {
status_.set(Intel::i8272::Status1::EndOfCylinder);
status_.set(Intel::i8272::Status0::AbnormalTermination);
break;
}
}
results_.serialise(
@ -175,18 +175,6 @@ class FloppyController {
decoder_.geometry().sector,
decoder_.geometry().size);
// 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(
// status_,
// decoder_.geometry().cylinder,
// decoder_.geometry().head,
// decoder_.geometry().sector,
// decoder_.geometry().size);
// }
// TODO: what if head has changed?
drives_[decoder_.target().drive].status = decoder_.drive_head();
drives_[decoder_.target().drive].raised_interrupt = true;
@ -281,6 +269,12 @@ class FloppyController {
}
void set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive) {
if(drives_[drive].disk) {
// TODO: drive should only transition to unready if it was ready in the first place.
drives_[drive].status = uint8_t(Intel::i8272::Status0::BecameNotReady);
drives_[drive].raised_interrupt = true;
pic_.apply_edge<6>(true);
}
drives_[drive].disk = disk;
}
@ -833,8 +827,8 @@ class IO {
case 0x03b1: case 0x03b3: case 0x03b5: case 0x03b7:
if constexpr (std::is_same_v<IntT, uint16_t>) {
mda_.write<1>(value);
mda_.write<0>(value >> 8);
mda_.write<1>(uint8_t(value));
mda_.write<0>(uint8_t(value >> 8));
} else {
mda_.write<1>(value);
}