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Add an 8272 results phase.

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This commit is contained in:
Thomas Harte 2023-11-27 23:05:37 -05:00
parent 993366ac5a
commit bffe3ffa25
6 changed files with 118 additions and 32 deletions
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50
Components/8272/CommandDecoder.hpp
View File

@ -15,33 +15,33 @@
namespace Intel::i8272 {
enum class Command {
ReadData = 0x06,
ReadDeletedData = 0x0c,
WriteData = 0x05,
WriteDeletedData = 0x09,
ReadTrack = 0x02,
ReadID = 0x0a,
FormatTrack = 0x0d,
ScanLow = 0x11,
ScanLowOrEqual = 0x19,
ScanHighOrEqual = 0x1d,
Recalibrate = 0x07,
Seek = 0x0f,
SenseInterruptStatus = 0x08,
Specify = 0x03,
SenseDriveStatus = 0x04,
Invalid = 0x00,
};
class CommandDecoder {
public:
enum class Command {
ReadData = 0x06,
ReadDeletedData = 0x0c,
WriteData = 0x05,
WriteDeletedData = 0x09,
ReadTrack = 0x02,
ReadID = 0x0a,
FormatTrack = 0x0d,
ScanLow = 0x11,
ScanLowOrEqual = 0x19,
ScanHighOrEqual = 0x1d,
Recalibrate = 0x07,
Seek = 0x0f,
SenseInterruptStatus = 0x08,
Specify = 0x03,
SenseDriveStatus = 0x04,
Invalid = 0x00,
};
/// Add a byte to the current command.
void push_back(uint8_t byte) {
command_.push_back(byte);

65
Components/8272/Results.hpp Normal file
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@ -0,0 +1,65 @@
//
// Results.hpp
// Clock Signal
//
// Created by Thomas Harte on 27/11/2023.
// Copyright © 2023 Thomas Harte. All rights reserved.
//
#ifndef Results_hpp
#define Results_hpp
#include "CommandDecoder.hpp"
#include "Status.hpp"
namespace Intel::i8272 {
class Results {
public:
/// Serialises the response to Command::Invalid and Command::SenseInterruptStatus when no interrupt source was found.
void serialise_none() {
result_ = { 0x80 };
}
/// Serialises the response to Command::SenseInterruptStatus for a found drive.
void serialise(const Status &status, uint8_t cylinder) {
result_ = { cylinder, status[0] };
}
/// Serialises the seven-byte response to Command::SenseDriveStatus.
void serialise(uint8_t flags, uint8_t drive_side) {
result_ = { uint8_t(flags | drive_side) };
}
/// Serialises the response to:
///
/// * Command::ReadData;
/// * Command::ReadDeletedData;
/// * Command::WriteData;
/// * Command::WriteDeletedData;
/// * Command::ReadID;
/// * Command::ReadTrack;
/// * Command::FormatTrack;
/// * Command::ScanLow; and
/// * Command::ScanHighOrEqual.
void serialise(const Status &status, uint8_t cylinder, uint8_t head, uint8_t sector, uint8_t size) {
result_ = { size, sector, head, cylinder, status[2], status[1], status[0] };
}
/// @returns @c true if all result bytes are exhausted; @c false otherwise.
bool empty() const { return result_.empty(); }
/// @returns The next byte of the result.
uint8_t next() {
const uint8_t next = result_.back();
result_.pop_back();
return next;
}
private:
std::vector<uint8_t> result_;
};
}
#endif /* Results_hpp */

3
Components/8272/Status.hpp
View File

@ -60,9 +60,8 @@ enum class Status3: uint8_t {
Fault = 0x80,
WriteProtected = 0x40,
Ready = 0x20,
Track9 = 0x10,
Track0 = 0x10,
TwoSided = 0x08,
HeadAddress = 0x04,
UnitSelect = 0x03,
};

1
Components/8272/i8272.cpp
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@ -268,7 +268,6 @@ void i8272::posit_event(int event_type) {
}
// Jump to the proper place.
using Command = CommandDecoder::Command;
switch(command_.command()) {
case Command::ReadData:
case Command::ReadDeletedData:

29
Machines/PCCompatible/PCCompatible.cpp
View File

@ -21,6 +21,7 @@
#include "../../Components/6845/CRTC6845.hpp"
#include "../../Components/8255/i8255.hpp"
#include "../../Components/8272/CommandDecoder.hpp"
#include "../../Components/8272/Results.hpp"
#include "../../Components/8272/Status.hpp"
#include "../../Components/AudioToggle/AudioToggle.hpp"
@ -70,20 +71,39 @@ class FloppyController {
decoder_.push_back(value);
if(decoder_.has_command()) {
using Command = Intel::i8272::CommandDecoder::Command;
using Command = Intel::i8272::Command;
switch(decoder_.command()) {
default:
printf("TODO: implement FDC command %d\n", uint8_t(decoder_.command()));
break;
// case Command::Invalid:
// break;
case Command::Invalid:
results_.serialise_none();
break;
case Command::SenseInterruptStatus:
results_.serialise_none();
break;
}
if(!results_.empty()) {
using MainStatus = Intel::i8272::MainStatus;
status_.set(MainStatus::DataIsToProcessor, true);
status_.set(MainStatus::DataReady, true);
}
}
}
uint8_t read() {
// TODO: is anything being serialised?
using MainStatus = Intel::i8272::MainStatus;
if(status_.get(MainStatus::DataIsToProcessor)) {
const uint8_t result = results_.next();
if(results_.empty()) {
status_.set(MainStatus::DataIsToProcessor, false);
}
return result;
}
return 0x80;
}
@ -102,6 +122,7 @@ class FloppyController {
Intel::i8272::CommandDecoder decoder_;
Intel::i8272::Status status_;
Intel::i8272::Results results_;
};
class KeyboardController {

2
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
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@ -1127,6 +1127,7 @@
/* Begin PBXFileReference section */
4238200B2B1295AD00964EFE /* Status.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Status.hpp; sourceTree = "<group>"; };
4238200C2B15998800964EFE /* Results.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Results.hpp; sourceTree = "<group>"; };
423BDC492AB24699008E37B6 /* 8088Tests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = 8088Tests.mm; sourceTree = "<group>"; };
42437B342ACF02A9006DFED1 /* Flags.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Flags.hpp; sourceTree = "<group>"; };
42437B352ACF0AA2006DFED1 /* Perform.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Perform.hpp; sourceTree = "<group>"; };
@ -4556,6 +4557,7 @@
4267A9CB2B113958008A59BB /* CommandDecoder.hpp */,
4BBC951D1F368D83008F4C34 /* i8272.hpp */,
4238200B2B1295AD00964EFE /* Status.hpp */,
4238200C2B15998800964EFE /* Results.hpp */,
);
path = 8272;
sourceTree = "<group>";