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Sculpt out enough to get to a read data command.

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This commit is contained in:
Thomas Harte 2023-11-29 09:42:43 -05:00
parent 3827a084ad
commit 6e2e67fd46
2 changed files with 62 additions and 11 deletions
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2
Components/8272/Status.hpp
View File

@ -97,6 +97,8 @@ class Status {
void set(Status1 flag) { set(uint8_t(flag), true, status_[1]); }
void set(Status2 flag) { set(uint8_t(flag), true, status_[2]); }
void set_status0(uint8_t value) { status_[0] = value; }
//
// Flag getters.
//

71
Machines/PCCompatible/PCCompatible.cpp
View File

@ -48,7 +48,7 @@ class FloppyController {
FloppyController(PIC &pic, DMA &dma) : pic_(pic), dma_(dma) {}
void set_digital_output(uint8_t control) {
printf("FDC DOR: %02x\n", control);
// printf("FDC DOR: %02x\n", control);
// b7, b6, b5, b4: enable motor for drive 4, 3, 2, 1;
// b3: 1 => enable DMA; 0 => disable;
@ -70,7 +70,7 @@ class FloppyController {
}
uint8_t status() const {
printf("FDC: read status %02x\n", status_.main());
// printf("FDC: read status %02x\n", status_.main());
return status_.main();
}
@ -89,17 +89,55 @@ class FloppyController {
results_.serialise_none();
break;
case Command::SenseInterruptStatus:
case Command::SenseInterruptStatus: {
printf("FDC: SenseInterruptStatus\n");
pic_.apply_edge<6>(false);
results_.serialise(status_, 0); // TODO: get track of relevant drive.
int c = 0;
for(; c < 4; c++) {
if(drives_[c].raised_interrupt) {
drives_[c].raised_interrupt = false;
status_.set_status0(drives_[c].status);
results_.serialise(status_, drives_[0].track);
}
}
bool any_remaining_interrupts = false;
for(; c < 4; c++) {
any_remaining_interrupts |= drives_[c].raised_interrupt;
}
if(!any_remaining_interrupts) {
pic_.apply_edge<6>(any_remaining_interrupts);
}
} break;
case Command::Specify:
printf("FDC: Specify\n");
specify_specs_ = decoder_.specify_specs();
break;
case Command::Recalibrate:
printf("FDC: Recalibrate\n");
drives_[decoder_.target().drive].track = 0;
drives_[decoder_.target().drive].raised_interrupt = true;
drives_[decoder_.target().drive].status = decoder_.target().drive;
pic_.apply_edge<6>(true);
break;
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].raised_interrupt = true;
drives_[decoder_.target().drive].status = decoder_.drive_head();
pic_.apply_edge<6>(true);
break;
}
// Set interrupt upon the end of any valid command other than sense interrupt status.
if(decoder_.command() != Command::SenseInterruptStatus && decoder_.command() != Command::Invalid) {
pic_.apply_edge<6>(true);
}
// if(decoder_.command() != Command::SenseInterruptStatus && decoder_.command() != Command::Invalid) {
// pic_.apply_edge<6>(true);
// }
decoder_.clear();
// If there are any results to provide, set data direction and data ready.
@ -120,7 +158,7 @@ class FloppyController {
status_.set(MainStatus::DataIsToProcessor, false);
status_.set(MainStatus::CommandInProgress, false);
}
printf("FDC read: %02x\n", result);
// printf("FDC read: %02x\n", result);
return result;
}
@ -133,12 +171,15 @@ class FloppyController {
printf("FDC reset\n");
decoder_.clear();
status_.reset();
pic_.apply_edge<6>(true);
// Necessary to pass GlaBIOS [if this is called after reset?], but Why?
//
// Cf. INT_13_0_2 and the CMP AL, 11000000B following a CALL FDC_WAIT_SENSE.
status_.set(Intel::i8272::Status0::BecameNotReady);
for(int c = 0; c < 4; c++) {
drives_[c].raised_interrupt = true;
drives_[c].status = uint8_t(Intel::i8272::Status0::BecameNotReady);
}
pic_.apply_edge<6>(true);
using MainStatus = Intel::i8272::MainStatus;
status_.set(MainStatus::DataReady, true);
@ -154,6 +195,14 @@ class FloppyController {
Intel::i8272::CommandDecoder decoder_;
Intel::i8272::Status status_;
Intel::i8272::Results results_;
Intel::i8272::CommandDecoder::SpecifySpecs specify_specs_;
struct DriveStatus {
bool raised_interrupt = false;
uint8_t status = 0;
uint8_t track = 0;
bool side = false;
} drives_[4];
};
class KeyboardController {