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apple2js/js/cards/cffa.ts

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TypeScript
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import type { byte, Card, Restorable } from '../types';
import { debug, toHex } from '../util';
import { rom as readOnlyRom } from '../roms/cards/cffa';
import { read2MGHeader } from '../formats/2mg';
import { ProDOSVolume } from '../formats/prodos';
import createBlockDisk from '../formats/block';
import { dump } from '../formats/prodos/utils';
import {
BlockDisk,
BlockFormat,
ENCODING_BLOCK,
MassStorage,
} from 'js/formats/types';
const rom = new Uint8Array(readOnlyRom);
const COMMANDS = {
ATACRead: 0x20,
ATACWrite: 0x30,
ATAIdentify: 0xEC
};
// CFFA Card Settings
const SETTINGS = {
Max32MBPartitionsDev0: 0x800,
Max32MBPartitionsDev1: 0x801,
DefaultBootDevice: 0x802,
DefaultBootPartition: 0x803,
Reserved: 0x804, // 4 bytes
WriteProtectBits: 0x808,
MenuSnagMask: 0x809,
MenuSnagKey: 0x80A,
BootTimeDelayTenths: 0x80B,
BusResetSeconds: 0x80C,
CheckDeviceTenths: 0x80D,
ConfigOptionBits: 0x80E,
BlockOffsetDev0: 0x80F, // 3 bytes
BlockOffsetDev1: 0x812, // 3 bytes
Unused: 0x815
};
// CFFA ATA Register Locations
const LOC = {
ATADataHigh: 0x80,
SetCSMask: 0x81,
ClearCSMask: 0x82,
WriteEEPROM: 0x83,
NoWriteEEPROM: 0x84,
ATADevCtrl: 0x86,
ATAAltStatus: 0x86,
ATADataLow: 0x88,
AError: 0x89,
ASectorCnt: 0x8a,
ASector: 0x8b,
ATACylinder: 0x8c,
ATACylinderH: 0x8d,
ATAHead: 0x8e,
ATACommand: 0x8f,
ATAStatus: 0x8f
};
// ATA Status Bits
const STATUS = {
BSY: 0x80, // Busy
DRDY: 0x40, // Drive ready. 1 when ready
DWF: 0x20, // Drive write fault. 1 when fault
DSC: 0x10, // Disk seek complete. 1 when not seeking
DRQ: 0x08, // Data request. 1 when ready to write
CORR: 0x04, // Correct data. 1 on correctable error
IDX: 0x02, // 1 once per revolution
ERR: 0x01 // Error. 1 on error
};
// ATA Identity Block Locations
const IDENTITY = {
SectorCountLow: 58,
SectorCountHigh: 57
};
export interface CFFAState {
disks: Array<BlockDisk | null>
}
type Partition = ReturnType<typeof ProDOSVolume>
export default class CFFA implements Card, MassStorage, Restorable<CFFAState> {
// CFFA internal Flags
private _disableSignalling = false;
private _writeEEPROM = true;
private _lba = true;
// LBA/CHS registers
private _sectorCnt = 1;
private _sector = 0;
private _cylinder = 0;
private _cylinderH = 0;
private _head = 0;
private _drive = 0;
// CFFA Data High register
private _dataHigh = 0;
// Current Sector
private _curSector: Uint16Array | number[];
private _curWord = 0;
// ATA Status registers
private _interruptsEnabled = false;
private _altStatus = 0;
private _error = 0;
private _identity: number[][] = [[], []];
// Disk data
private _partitions: Array<Partition|null> = [
// Drive 1
null,
// Drive 2
null
];
private _sectors: Uint16Array[][] = [
// Drive 1
[],
// Drive 2
[]
];
constructor() {
debug('CFFA');
for (let idx = 0; idx < 0x100; idx++) {
this._identity[0][idx] = 0;
this._identity[1][idx] = 0;
}
rom[SETTINGS.Max32MBPartitionsDev0] = 0x1;
rom[SETTINGS.Max32MBPartitionsDev1] = 0x0;
rom[SETTINGS.BootTimeDelayTenths] = 0x5; // 0.5 seconds
rom[SETTINGS.CheckDeviceTenths] = 0x5; // 0.5 seconds
}
// Verbose debug method
private _debug(..._args: any[]) {
// debug.apply(this, arguments);
}
private _reset() {
this._debug('reset');
this._sectorCnt = 1;
this._sector = 0;
this._cylinder = 0;
this._cylinderH = 0;
this._head = 0;
this._drive = 0;
this._dataHigh = 0;
}
// Convert status register into readable string
private _statusString(status: byte) {
const statusArray = [];
let flag: keyof typeof STATUS;
for (flag in STATUS) {
if(status & STATUS[flag]) {
statusArray.push(flag);
}
}
return statusArray.join('|');
}
// Dump sector as hex and ascii
private _dumpSector(sector: number) {
if (sector >= this._sectors[this._drive].length) {
this._debug('dump sector out of range', sector);
return;
}
for (let idx = 0; idx < 16; idx++) {
const row = [];
const charRow = [];
for (let jdx = 0; jdx < 16; jdx++) {
const val = this._sectors[this._drive][sector][idx * 16 + jdx];
row.push(toHex(val, 4));
const low = val & 0x7f;
const hi = val >> 8 & 0x7f;
charRow.push(low > 0x1f ? String.fromCharCode(low) : '.');
charRow.push(hi > 0x1f ? String.fromCharCode(hi) : '.');
}
this._debug(row.join(' '), ' ', charRow.join(''));
}
}
// Card I/O access
private _access(off: byte, val: byte) {
const readMode = val === undefined;
let retVal;
let sector;
if (readMode) {
retVal = 0;
switch (off & 0x8f) {
case LOC.ATADataHigh: // 0x00
retVal = this._dataHigh;
break;
case LOC.SetCSMask: // 0x01
this._disableSignalling = true;
break;
case LOC.ClearCSMask: // 0x02
this._disableSignalling = false;
break;
case LOC.WriteEEPROM: // 0x03
this._writeEEPROM = true;
break;
case LOC.NoWriteEEPROM: // 0x04
this._writeEEPROM = false;
break;
case LOC.ATAAltStatus: // 0x06
retVal = this._altStatus;
break;
case LOC.ATADataLow: // 0x08
this._dataHigh = this._curSector[this._curWord] >> 8;
retVal = this._curSector[this._curWord] & 0xff;
if (!this._disableSignalling) {
this._curWord++;
}
break;
case LOC.AError: // 0x09
retVal = this._error;
break;
case LOC.ASectorCnt: // 0x0A
retVal = this._sectorCnt;
break;
case LOC.ASector: // 0x0B
retVal = this._sector;
break;
case LOC.ATACylinder: // 0x0C
retVal = this._cylinder;
break;
case LOC.ATACylinderH: // 0x0D
retVal = this._cylinderH;
break;
case LOC.ATAHead: // 0x0E
retVal = this._head | (this._lba ? 0x40 : 0) | (this._drive ? 0x10 : 0) | 0xA0;
break;
case LOC.ATAStatus: // 0x0F
retVal = this._sectors[this._drive].length > 0 ? STATUS.DRDY | STATUS.DSC : 0;
this._debug('returning status', this._statusString(retVal));
break;
default:
debug('read unknown soft switch', toHex(off));
}
if (off & 0x7) { // Anything but data high/low
this._debug('read soft switch', toHex(off), toHex(retVal));
}
} else {
if (off & 0x7) { // Anything but data high/low
this._debug('write soft switch', toHex(off), toHex(val));
}
switch (off & 0x8f) {
case LOC.ATADataHigh: // 0x00
this._dataHigh = val;
break;
case LOC.SetCSMask: // 0x01
this._disableSignalling = true;
break;
case LOC.ClearCSMask: // 0x02
this._disableSignalling = false;
break;
case LOC.WriteEEPROM: // 0x03
this._writeEEPROM = true;
break;
case LOC.NoWriteEEPROM: // 0x04
this._writeEEPROM = false;
break;
case LOC.ATADevCtrl: // 0x06
this._debug('devCtrl:', toHex(val));
this._interruptsEnabled = (val & 0x04) ? true : false;
this._debug('Interrupts', this._interruptsEnabled ? 'enabled' : 'disabled');
if (val & 0x02) {
this._reset();
}
break;
case LOC.ATADataLow: // 0x08
this._curSector[this._curWord] = this._dataHigh << 8 | val;
this._curWord++;
break;
case LOC.ASectorCnt: // 0x0a
this._debug('setting sector count', val);
this._sectorCnt = val;
break;
case LOC.ASector: // 0x0b
this._debug('setting sector', toHex(val));
this._sector = val;
break;
case LOC.ATACylinder: // 0x0c
this._debug('setting cylinder', toHex(val));
this._cylinder = val;
break;
case LOC.ATACylinderH: // 0x0d
this._debug('setting cylinder high', toHex(val));
this._cylinderH = val;
break;
case LOC.ATAHead:
this._head = val & 0xf;
this._lba = val & 0x40 ? true : false;
this._drive = val & 0x10 ? 1 : 0;
this._debug('setting head', toHex(val & 0xf), 'drive', this._drive);
if (!this._lba) {
console.error('CHS mode not supported');
}
break;
case LOC.ATACommand: // 0x0f
this._debug('command:', toHex(val));
sector = this._head << 24 | this._cylinderH << 16 | this._cylinder << 8 | this._sector;
this._dumpSector(sector);
switch (val) {
case COMMANDS.ATAIdentify:
this._debug('ATA identify');
this._curSector = this._identity[this._drive];
this._curWord = 0;
break;
case COMMANDS.ATACRead:
this._debug('ATA read sector', toHex(this._cylinderH), toHex(this._cylinder), toHex(this._sector), sector);
this._curSector = this._sectors[this._drive][sector];
this._curWord = 0;
break;
case COMMANDS.ATACWrite:
this._debug('ATA write sector', toHex(this._cylinderH), toHex(this._cylinder), toHex(this._sector), sector);
this._curSector = this._sectors[this._drive][sector];
this._curWord = 0;
break;
default:
debug('unknown command', toHex(val));
}
break;
default:
debug('write unknown soft switch', toHex(off), toHex(val));
}
}
return retVal;
}
ioSwitch(off: byte, val: byte) {
return this._access(off, val);
}
read(page: byte, off: byte) {
return rom[(page - 0xc0) << 8 | off];
}
write(page: byte, off: byte, val: byte) {
if (this._writeEEPROM) {
this._debug('writing', toHex(page << 8 | off), toHex(val));
rom[(page - 0xc0) << 8 | off] - val;
}
}
getState() {
return {
disks: this._partitions.map(
(partition) => {
let result: BlockDisk | null = null;
if (partition) {
const disk: BlockDisk = partition.disk();
result = {
blocks: disk.blocks.map(
(block) => new Uint8Array(block)
),
encoding: ENCODING_BLOCK,
readOnly: disk.readOnly,
name: disk.name,
};
}
return result;
}
)
};
}
setState(state: CFFAState) {
state.disks.forEach(
(disk, idx) => {
if (disk) {
this.setBlockVolume(idx + 1, disk);
} else {
this.resetBlockVolume(idx + 1);
}
}
);
}
resetBlockVolume(drive: number) {
drive = drive - 1;
this._sectors[drive] = [];
this._identity[drive][IDENTITY.SectorCountHigh] = 0;
this._identity[drive][IDENTITY.SectorCountLow] = 0;
if (drive) {
rom[SETTINGS.Max32MBPartitionsDev1] = 0x0;
} else {
rom[SETTINGS.Max32MBPartitionsDev0] = 0x0;
}
}
setBlockVolume(drive: number, disk: BlockDisk) {
drive = drive - 1;
// Convert 512 byte blocks into 256 word sectors
this._sectors[drive] = disk.blocks.map(function(block) {
return new Uint16Array(block.buffer);
});
this._identity[drive][IDENTITY.SectorCountHigh] = this._sectors[0].length & 0xffff;
this._identity[drive][IDENTITY.SectorCountLow] = this._sectors[0].length >> 16;
const prodos = ProDOSVolume(disk);
dump(prodos);
this._partitions[drive] = prodos;
if (drive) {
rom[SETTINGS.Max32MBPartitionsDev1] = 0x1;
} else {
rom[SETTINGS.Max32MBPartitionsDev0] = 0x1;
}
return true;
}
// Assign a raw disk image to a drive. Must be 2mg or raw PO image.
setBinary(drive: number, name: string, ext: BlockFormat, rawData: ArrayBuffer) {
const volume = 254;
const readOnly = false;
if (ext === '2mg') {
const { bytes, offset } = read2MGHeader(rawData);
rawData = rawData.slice(offset, offset + bytes);
}
const options = {
rawData,
name,
volume,
readOnly
};
const disk = createBlockDisk(options);
return this.setBlockVolume(drive, disk);
}
}
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