mirror of
https://github.com/JorjBauer/aiie.git
synced 2024-09-11 01:56:59 +00:00
687 lines
18 KiB
C++
687 lines
18 KiB
C++
#include "diskii.h"
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#ifdef TEENSYDUINO
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#include <Arduino.h>
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#else
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#endif
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#include "applemmu.h" // for FLOATING
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#include "globals.h"
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#include "diskii-rom.h"
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#define DISKIIMAGIC 0xAA
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DiskII::DiskII(AppleMMU *mmu)
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{
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this->trackBuffer = new LRingBuffer(NIBTRACKSIZE);
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this->rawTrackBuffer = (uint8_t *)malloc(4096);
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this->mmu = mmu;
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curPhase[0] = curPhase[1] = 0;
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curHalfTrack[0] = curHalfTrack[1] = 0;
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trackDirty = false;
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trackToRead = -1;
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trackToFlush = -1;
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writeMode = false;
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writeProt = false; // FIXME: expose an interface to this
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readWriteLatch = 0x00;
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disk[0] = disk[1] = -1;
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indicatorIsOn[0] = indicatorIsOn[1] = 0;
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selectedDisk = 0;
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diskType[0] = diskType[1] = dosDisk;
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}
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DiskII::~DiskII()
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{
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delete this->trackBuffer; this->trackBuffer = NULL;
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free(this->rawTrackBuffer); this->rawTrackBuffer = NULL;
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}
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bool DiskII::Serialize(int8_t fd)
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{
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/* Make sure to flush anything to disk first */
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checkFlush(curHalfTrack[selectedDisk]>>1);
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if (trackToFlush != -1) {
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flushTrack(trackToFlush, diskToFlush);
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}
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trackToFlush = -1;
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g_filemanager->writeByte(fd, DISKIIMAGIC);
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g_filemanager->writeByte(fd, curHalfTrack[0]);
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g_filemanager->writeByte(fd, curHalfTrack[1]);
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g_filemanager->writeByte(fd, curPhase[0]);
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g_filemanager->writeByte(fd, curPhase[1]);
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g_filemanager->writeByte(fd, readWriteLatch);
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g_filemanager->writeByte(fd, writeMode);
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g_filemanager->writeByte(fd, writeProt);
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// Don't save disk[0,1]; save their file names & cursors
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g_filemanager->SerializeFile(fd, disk[0]);
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g_filemanager->SerializeFile(fd, disk[1]);
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g_filemanager->writeByte(fd, indicatorIsOn[0]);
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g_filemanager->writeByte(fd, indicatorIsOn[1]);
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g_filemanager->writeByte(fd, diskType[0]);
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g_filemanager->writeByte(fd, diskType[1]);
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g_filemanager->writeByte(fd, selectedDisk);
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trackBuffer->Serialize(fd);
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// FIXME: don't know if we need these
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// trackDirty - should always be unset, since we just flushed
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// rawTrackBuffer - only used when reading an image
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// trackToRead - should be able to leave this unset & reread
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// trackToFlush - just flushed
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// diskToFlush - just flushed
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g_filemanager->writeByte(fd, DISKIIMAGIC);
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return true;
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}
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bool DiskII::Deserialize(int8_t fd)
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{
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/* Make sure to flush anything to disk first */
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checkFlush(curHalfTrack[selectedDisk]>>1);
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if (trackToFlush != -1) {
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flushTrack(trackToFlush, diskToFlush);
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}
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trackToFlush = -1;
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if (g_filemanager->readByte(fd) != DISKIIMAGIC) {
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return false;
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}
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curHalfTrack[0] = g_filemanager->readByte(fd);
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curHalfTrack[1] = g_filemanager->readByte(fd);
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curPhase[0] = g_filemanager->readByte(fd);
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curPhase[1] = g_filemanager->readByte(fd);
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readWriteLatch = g_filemanager->readByte(fd);
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writeMode = g_filemanager->readByte(fd);
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writeProt = g_filemanager->readByte(fd);
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disk[0] = g_filemanager->DeserializeFile(fd);
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disk[1] = g_filemanager->DeserializeFile(fd);
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indicatorIsOn[0] = g_filemanager->readByte(fd);
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indicatorIsOn[1] = g_filemanager->readByte(fd);
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diskType[0] = g_filemanager->readByte(fd);
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diskType[1] = g_filemanager->readByte(fd);
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selectedDisk = g_filemanager->readByte(fd);
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trackBuffer->Deserialize(fd);
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// Reset the dirty caches and whatnot
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trackDirty = -1;
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trackToRead = -1;
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trackToFlush = -1;
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diskToFlush = -1;
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if (g_filemanager->readByte(fd) != DISKIIMAGIC) {
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return false;
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}
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return true;
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}
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void DiskII::Reset()
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{
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curPhase[0] = curPhase[1] = 0;
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curHalfTrack[0] = curHalfTrack[1] = 0;
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trackDirty = false;
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trackToRead = -1;
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trackToFlush = -1;
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writeMode = false;
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writeProt = false; // FIXME: expose an interface to this
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readWriteLatch = 0x00;
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ejectDisk(0);
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ejectDisk(1);
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}
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void DiskII::checkFlush(int8_t track)
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{
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if (trackDirty && trackToFlush == -1) {
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diskToFlush = selectedDisk;
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trackToFlush = track;
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trackDirty = false; // just so we don't overwrite disk/track to flush before continuing...
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}
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}
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uint8_t DiskII::readSwitches(uint8_t s)
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{
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switch (s) {
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case 0x00: // change stepper motor phase
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break;
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case 0x01:
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setPhase(0);
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break;
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case 0x02:
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break;
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case 0x03:
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setPhase(1);
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break;
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case 0x04:
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break;
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case 0x05:
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setPhase(2);
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break;
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case 0x06: // 3 off
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break;
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case 0x07: // 3 on
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setPhase(3);
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break;
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case 0x08: // drive off
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indicatorIsOn[selectedDisk] = 99;
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g_display->setDriveIndicator(selectedDisk, false); // FIXME: after a spell...
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checkFlush(curHalfTrack[selectedDisk]>>1);
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break;
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case 0x09: // drive on
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indicatorIsOn[selectedDisk] = 100;
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g_display->setDriveIndicator(selectedDisk, true);
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break;
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case 0x0A: // select drive 1
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select(0);
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break;
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case 0x0B: // select drive 2
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select(1);
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break;
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case 0x0C: // shift one read or write byte
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readWriteLatch = readOrWriteByte();
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break;
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case 0x0D: // load data register (latch)
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// This is complex and incomplete. cf. Logic State Sequencer,
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// UTA2E, p. 9-14
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if (!writeMode) {
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if (isWriteProtected())
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readWriteLatch |= 0x80;
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else
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readWriteLatch &= 0x7F;
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}
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break;
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case 0x0E: // set read mode
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setWriteMode(false);
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break;
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case 0x0F: // set write mode
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setWriteMode(true);
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break;
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}
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// FIXME: improve the spin-down here. We need a CPU cycle callback
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// for some period of time instead of this silly decrement counter.
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if (!indicatorIsOn[selectedDisk]) {
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// printf("Unexpected read while disk isn't on?\n");
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indicatorIsOn[selectedDisk] = 100;
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g_display->setDriveIndicator(selectedDisk, true);
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}
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if (indicatorIsOn[selectedDisk] > 0 && indicatorIsOn[selectedDisk] < 100) {
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// slowly spin it down...
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if (--indicatorIsOn[selectedDisk] == 0) {
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g_display->setDriveIndicator(selectedDisk, false);
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}
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}
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// Any even address read returns the readWriteLatch (UTA2E Table 9.1,
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// p. 9-12, note 2)
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// if ((s & 1) == 0 && curHalfTrack[selectedDisk] <= 3) {
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// printf("Read: %X\n", readWriteLatch);
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// fflush(stdout);
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// }
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return (s & 1) ? FLOATING : readWriteLatch;
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}
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void DiskII::writeSwitches(uint8_t s, uint8_t v)
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{
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switch (s) {
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case 0x00: // change stepper motor phase
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break;
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case 0x01:
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setPhase(0);
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break;
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case 0x02:
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break;
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case 0x03:
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setPhase(1);
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break;
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case 0x04:
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break;
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case 0x05:
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setPhase(2);
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break;
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case 0x06: // 3 off
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break;
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case 0x07: // 3 on
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setPhase(3);
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break;
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case 0x08: // drive off
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break;
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case 0x09: // drive on
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break;
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case 0x0A: // select drive 1
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select(0);
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break;
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case 0x0B: // select drive 2
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select(1);
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break;
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case 0x0C: // shift one read or write byte
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readOrWriteByte();
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break;
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case 0x0D: // drive write
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break;
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case 0x0E: // set read mode
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setWriteMode(false);
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break;
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case 0x0F: // set write mode
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setWriteMode(true);
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break;
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}
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// All writes update the latch
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if (writeMode) {
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readWriteLatch = v;
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}
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}
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/* The Disk ][ has a stepper motor that moves the head across the tracks.
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* Switches 0-7 turn off and on the four different magnet phases; pulsing
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* from (e.g.) phase 0 to phase 1 makes the motor move up a track, and
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* (e.g.) phase 1 to phase 0 makes the motor move down a track.
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*
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* Except that's not quite true: the stepper actually moves the head a
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* _half_ track.
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*
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* This is a very simplified version of the stepper motor code. In theory,
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* we should keep track of all 4 phase magnets; and then only move up or down
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* a half track when two adjacent motors are on (not three adjacent motors;
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* and not two opposite motors). But that physical characteristic isn't
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* important for most diskettes, and our image formats aren't likely to
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* be able to provide appropriate half-track data to the programs that played
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* tricks with these half-tracks (for copy protection or whatever).
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*
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* This setPhase is only called when turning *on* a phase. It's assumed that
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* something is turning *off* the phases correctly; and that the combination
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* of the previous phase that was on and the current phase that's being turned
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* on are reliable enough to determine direction.
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*
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* The _phase_delta array is four sets of offsets - one for each
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* current phase, detailing what the step will be given the next
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* phase. This kind of emulates the messiness of going from phase 0
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* to 2 -- it's going to move forward two half-steps -- but then doing
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* the same thing again is just going to move you back two half-steps...
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*
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*/
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void DiskII::setPhase(uint8_t phase)
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{
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const int8_t _phase_delta[16] = { 0, 1, 2, -1, // prev phase 0 -> 0/1/2/3
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-1, 0, 1, 2, // prev phase 1 -> 0/1/2/3
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-2, -1, 0, 1, // prev phase 2 -> 0/1/2/3
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1, -2, -1, 0 // prev phase 3 -> 0/1/2/3
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};
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int8_t prevPhase = curPhase[selectedDisk];
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int8_t prevHalfTrack = curHalfTrack[selectedDisk];
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curHalfTrack[selectedDisk] += _phase_delta[(prevPhase * 4) + phase];
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curPhase[selectedDisk] = phase;
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// Cap at 35 tracks (a normal disk size). Some drives let you go farther,
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// and we could support that by increasing this limit - but the images
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// would be different too, so there would be more work to abstract out...
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if (curHalfTrack[selectedDisk] > 35 * 2 - 1) {
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curHalfTrack[selectedDisk] = 35 * 2 - 1;
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}
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// Don't go past the innermost track, of course.
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if (curHalfTrack[selectedDisk] < 0) {
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curHalfTrack[selectedDisk] = 0;
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// recalibrate! This is where the fun noise goes DaDaDaDaDaDaDaDaDa
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}
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/*
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printf("phase %d => %d; curHalfTrack %d => %d\n",
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prevPhase, curPhase[selectedDisk],
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prevHalfTrack, curHalfTrack[selectedDisk]);
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*/
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if (curHalfTrack[selectedDisk]>>1 != prevHalfTrack>>1) {
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// We're changing track - flush the old track back to disk
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checkFlush(prevHalfTrack>>1);
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// mark the new track to be read
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trackToRead = curHalfTrack[selectedDisk]>>1;
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}
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}
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bool DiskII::isWriteProtected()
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{
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return (writeProt ? 0xFF : 0x00);
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}
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void DiskII::setWriteMode(bool enable)
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{
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writeMode = enable;
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}
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static uint8_t _lc(char c)
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{
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if (c >= 'A' && c <= 'Z') {
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c = c - 'A' + 'a';
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}
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return c;
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}
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static bool _endsWithI(const char *s1, const char *s2)
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{
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if (strlen(s2) > strlen(s1)) {
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return false;
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}
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const char *p = &s1[strlen(s1)-1];
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int16_t l = strlen(s2)-1;
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while (l >= 0) {
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if (_lc(*p--) != _lc(s2[l]))
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return false;
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l--;
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}
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return true;
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}
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void DiskII::insertDisk(int8_t driveNum, const char *filename, bool drawIt)
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{
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ejectDisk(driveNum);
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disk[driveNum] = g_filemanager->openFile(filename);
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if (drawIt)
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g_display->drawDriveDoor(driveNum, false);
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if (_endsWithI(filename, ".nib")) {
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diskType[driveNum] = nibDisk;
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} else if (_endsWithI(filename, ".po")) {
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diskType[driveNum] = prodosDisk;
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} else {
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diskType[driveNum] = dosDisk;
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#ifndef TEENSYDUINO
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// debugging: make a nib copy of the image to play with
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// convertDskToNib("/tmp/debug.nib");
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#endif
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}
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}
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void DiskII::ejectDisk(int8_t driveNum)
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{
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if (disk[driveNum] != -1) {
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g_filemanager->closeFile(disk[driveNum]);
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disk[driveNum] = -1;
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g_display->drawDriveDoor(driveNum, true);
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}
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}
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void DiskII::select(int8_t which)
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{
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if (which != 0 && which != 1)
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return;
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if (which != selectedDisk) {
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indicatorIsOn[selectedDisk] = 0;
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g_display->setDriveIndicator(selectedDisk, false);
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checkFlush(curHalfTrack[selectedDisk]>>1);
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// set the selected disk drive
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selectedDisk = which;
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// trackToRead = curHalfTrack[selectedDisk]>>1;
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trackToRead = -1; // Assume we don't have to read anything on the
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// newly selected drive. When we get the first
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// read, we'll notice the track buffer is empty...
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trackBuffer->clear();
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}
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}
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uint8_t DiskII::readOrWriteByte()
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{
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if (disk[selectedDisk] == -1) {
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return GAP;
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}
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if (writeMode && !writeProt) {
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if (!trackBuffer->hasData()) {
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// Error: writing to empty track buffer? That's a raw write w/o
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// knowing where we are on the disk.
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return GAP;
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}
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trackDirty = true;
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// It's possible that a badly behaving OS could try to write more
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// data than we have buffer to handle. Don't let it. We should
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// only need something like 500 bytes, at worst. In the typical
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// case, we're talking about something like
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//
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// ~5 bytes of GAP
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// 3 bytes of sector prolog
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// 2 bytes of volume
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// 2 bytes of track
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// 2 bytes of sector
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// 2 bytes of checksum
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// 2 bytes of epilog
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// ~5 bytes of GAP
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// 3 bytes of data prolog
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// 342 bytes of GRP-encoded (6:2) data
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// 1 byte of checksum
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// 3 bytes of epilog
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// 1 byte of GAP
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// == 373 bytes
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//
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// ... so if we get up to the full 1024 we've allocated, there's
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// something suspicious happening.
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if (readWriteLatch < 0x96) {
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// Can't write a de-nibblized byte...
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g_display->debugMsg("DII: bad write");
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return 0;
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}
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trackBuffer->replaceByte(readWriteLatch);
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return 0;
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}
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// trackToRead is -1 when we have a filled buffer, or we have no data at all.
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// trackToRead is != -1 when we're flushing our buffer and re-filling it.
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//
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// Don't fill it right here, b/c we don't want to bog down the CPU
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// thread/ISR.
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if (trackToRead == curHalfTrack[selectedDisk]>>1) {// waiting for a read to complete for the current track
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return GAP;
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}
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// return 0x00 every other byte. Helps the logic sequencer stay in sync.
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// Otherwise we wind up waiting long periods of time for it to sync up,
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// presumably because we're overrunning it (returning data faster than
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// the actual drive would be able to)?
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static bool whitespace = false;
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if (whitespace) {
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whitespace = false;
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return 0x00;
|
|
}
|
|
|
|
whitespace = !whitespace;
|
|
|
|
if ((trackToRead != -1) || !trackBuffer->hasData()) {
|
|
checkFlush(curHalfTrack[selectedDisk]>>1);
|
|
|
|
// Need to read in a track of data and nibblize it. We'll return 0xFF
|
|
// until that completes.
|
|
|
|
// This might update trackToRead with a different track than the
|
|
// one we're reading. When we finish the read, we'll need to check
|
|
// to be sure that we're still trying to read the same track that
|
|
// we started with.
|
|
trackToRead = curHalfTrack[selectedDisk]>>1;
|
|
|
|
// While we're waiting for the sector to come around, we'll return
|
|
// GAP bytes.
|
|
return GAP;
|
|
}
|
|
|
|
return trackBuffer->peekNext();
|
|
}
|
|
|
|
void DiskII::fillDiskBuffer()
|
|
{
|
|
if (trackToFlush != -1) {
|
|
flushTrack(trackToFlush, diskToFlush); // in case it's dirty: flush before changing drives
|
|
trackBuffer->clear();
|
|
|
|
trackToFlush = -1;
|
|
}
|
|
|
|
// No work to do if trackToRead is -1
|
|
if (trackToRead == -1)
|
|
return;
|
|
|
|
trackDirty = false;
|
|
|
|
int8_t trackWeAreReading = trackToRead;
|
|
int8_t diskWeAreUsing = selectedDisk;
|
|
|
|
trackBuffer->clear();
|
|
trackBuffer->setPeekCursor(0);
|
|
|
|
if (diskType[diskWeAreUsing] == nibDisk) {
|
|
// Read one nibblized sector at a time and jam it in trackBuf
|
|
// directly. We don't read the whole track at once only because
|
|
// of RAM constraints on the Teensy. There's no reason we
|
|
// couldn't, though, if RAM weren't at a premium.
|
|
|
|
for (int i=0; i<16; i++) {
|
|
g_filemanager->seekBlock(disk[diskWeAreUsing], trackWeAreReading * 16 + i, true);
|
|
if (!g_filemanager->readBlock(disk[diskWeAreUsing], rawTrackBuffer, true)) {
|
|
// FIXME: error handling?
|
|
trackToRead = -1;
|
|
return;
|
|
}
|
|
trackBuffer->addBytes(rawTrackBuffer, 416);
|
|
}
|
|
} else {
|
|
// It's a .dsk / .po disk image. Read the whole track in to
|
|
// rawTrackBuffer and nibblize it.
|
|
g_filemanager->seekBlock(disk[diskWeAreUsing], trackWeAreReading * 16, false);
|
|
if (!g_filemanager->readTrack(disk[diskWeAreUsing], rawTrackBuffer, false)) {
|
|
// FIXME: error handling?
|
|
trackToRead = -1;
|
|
return;
|
|
}
|
|
|
|
nibblizeTrack(trackBuffer, rawTrackBuffer, diskType[diskWeAreUsing], curHalfTrack[selectedDisk]>>1);
|
|
}
|
|
|
|
// Make sure we're still intending to read the track we just read
|
|
if (trackWeAreReading != trackToRead ||
|
|
diskWeAreUsing != selectedDisk) {
|
|
// Abort and let it start over next time
|
|
return;
|
|
}
|
|
|
|
// Buffer is full, we're done - reset trackToRead and that will let the reads reach the CPU!
|
|
trackToRead = -1;
|
|
}
|
|
|
|
const char *DiskII::DiskName(int8_t num)
|
|
{
|
|
if (disk[num] != -1)
|
|
return g_filemanager->fileName(disk[num]);
|
|
|
|
return "";
|
|
}
|
|
|
|
void DiskII::loadROM(uint8_t *toWhere)
|
|
{
|
|
#ifdef TEENSYDUINO
|
|
Serial.println("loading DiskII rom");
|
|
for (uint16_t i=0; i<=0xFF; i++) {
|
|
toWhere[i] = pgm_read_byte(&romData[i]);
|
|
}
|
|
#else
|
|
printf("loading DiskII rom\n");
|
|
memcpy(toWhere, romData, 256);
|
|
#endif
|
|
}
|
|
|
|
void DiskII::flushTrack(int8_t track, int8_t sel)
|
|
{
|
|
// safety check: if we're write-protected, then how did we get here?
|
|
if (writeProt) {
|
|
g_display->debugMsg("Write Protected");
|
|
return;
|
|
}
|
|
|
|
if (!trackBuffer->hasData()) {
|
|
// Dunno what happened - we're writing but haven't initialized the sector buffer?
|
|
return;
|
|
}
|
|
|
|
if (diskType[sel] == nibDisk) {
|
|
// Write the whole track out exactly as we've got it. Hopefully
|
|
// someone has re-calcuated appropriate checksums on it...
|
|
g_display->debugMsg("Not writing Nib image");
|
|
return;
|
|
}
|
|
|
|
nibErr e = denibblizeTrack(trackBuffer, rawTrackBuffer, diskType[sel], curHalfTrack[selectedDisk]>>1);
|
|
switch (e) {
|
|
case errorShortTrack:
|
|
g_display->debugMsg("DII: short track");
|
|
trackBuffer->clear();
|
|
return;
|
|
|
|
case errorMissingSectors:
|
|
g_display->debugMsg("DII: missing sectors");
|
|
trackBuffer->clear();
|
|
break;
|
|
|
|
case errorNone:
|
|
break;
|
|
}
|
|
|
|
// ok, write the track!
|
|
g_filemanager->seekBlock(disk[sel], track * 16);
|
|
g_filemanager->writeTrack(disk[sel], rawTrackBuffer);
|
|
}
|
|
|