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mt362x.c
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/*--------------------------------------------------------------------------
**
** Copyright (c) 2003-2011, Tom Hunter
**
** Name: mt362x.c
**
** Description:
** Perform emulation of CDC 607 7-track tape drives attached to a
** 362x magnetic tape controller. Also supports 9-track tape images
** by using a fictious 609 9-track drive.
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License version 3 as
** published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License version 3 for more details.
**
** You should have received a copy of the GNU General Public License
** version 3 along with this program in file "license-gpl-3.0.txt".
** If not, see <http://www.gnu.org/licenses/gpl-3.0.txt>.
**
**--------------------------------------------------------------------------
*/
#define DEBUG 0
/*
** -------------
** Include Files
** -------------
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "const.h"
#include "types.h"
#include "proto.h"
#include "dcc6681.h"
/*
** -----------------
** Private Constants
** -----------------
*/
/*
** CDC 362x tape function codes.
*/
#define Fc362xRelease 00000
#define Fc362xSelectBinary 00001
#define Fc362xSelectCoded 00002
#define Fc362xSelect556Bpi 00003
#define Fc362xSelect200Bpi 00004
#define Fc362xClear 00005
#define Fc362xSelect800Bpi 00006
#define Fc362xRewind 00010
#define Fc362xRewindUnload 00011
#define Fc362xBackspace 00012
#define Fc362xSearchFwdFileMark 00013
#define Fc362xSearchBckFileMark 00014
#define Fc362xWriteFileMark 00015
#define Fc362xSkipBadSpot 00016
#define Fc362xSelectIntReady 00020
#define Fc362xReleaseIntReady 00021
#define Fc362xSelectIntEndOfOp 00022
#define Fc362xReleaseIntEndOfOp 00023
#define Fc362xSelectIntError 00024
#define Fc362xReleaseIntError 00025
#define Fc362xClearReverseRead 00040
#define Fc362xSetReverseRead 00041
/*
** CDC 362x tape status bits.
*/
#define St362xReady 00001
#define St362xBusy 00002
#define St362xWriteEnable 00004
#define St362xFileMark 00010
#define St362xLoadPoint 00020
#define St362xEndOfTape 00040
#define St362xDensity200Bpi 00000
#define St362xDensity556Bpi 00100
#define St362xDensity800Bpi 00200
#define St362xLostData 00400
#define St362xEndOfOperation 01000
#define St362xParityError 02000
#define St362xUnitReserved 04000
#define Int362xReady 00001
#define Int362xEndOfOp 00002
#define Int362xError 00004
#define St362xReadyMask (St362xReady | St362xBusy)
#define St362xWriteMask 00007 // Also includes Busy, Ready
#define St362xWriteReady 00005
#define St362xNonDensityMask 07475
#define St362xConnectClr 03367
#define St362xClearMask 01765 // Clears Parity, File Mark, Busy
#define St362xMstrClrMask 01365
#define St362xTpMotionClr 03305
#define St362xDensityParity 03300
#define St362xRWclear 01305
#define St362xClearBusy 07775
/*
** Misc constants.
*/
#define MaxPpBuf 40000
#define MaxByteBuf 60000
#define MaxTapeSize 1250000000 // this may need adjusting for shorter real tapes
/*
** -----------------------
** Private Macro Functions
** -----------------------
*/
/*
** -----------------------------------------
** Private Typedef and Structure Definitions
** -----------------------------------------
*/
/*
** 362x tape unit.
*/
typedef struct tapeParam
{
/*
** Info for show_tape operator command.
*/
struct tapeParam *nextTape;
u8 channelNo;
u8 eqNo;
u8 unitNo;
char fileName[MaxFSPath];
/*
** Format parameters.
*/
u8 tracks;
/*
** Tape status variables.
*/
PpWord intMask;
PpWord intStatus;
PpWord status;
bool bcdMode;
bool reverseRead;
bool writing;
bool unitReady;
bool busy;
bool ringIn;
bool fileMark;
u32 blockNo;
bool endOfTape;
u16 density;
bool lostData;
bool endOfOperation;
bool parityError;
bool reserved;
bool rewinding;
u32 rewindStart;
/*
** I/O buffer.
*/
PpWord recordLength;
PpWord ioBuffer[MaxPpBuf];
PpWord *bp;
} TapeParam;
/*
** ---------------------------
** Private Function Prototypes
** ---------------------------
*/
static void mt362xInit(u8 eqNo, u8 unitNo, u8 channelNo, char *deviceName, u8 tracks);
static void mt362xInitStatus(TapeParam *tp);
static void mt362xResetStatus(TapeParam *tp);
static void mt362xSetupStatus(TapeParam *tp);
static FcStatus mt362xFunc(PpWord funcCode);
static void mt362xIo(void);
static void mt362xActivate(void);
static void mt362xDisconnect(void);
static void mt362xFuncRead(void);
static void mt362xFuncReadBkw(void);
static void mt362xFuncForespace(void);
static void mt362xFuncBackspace(void);
static void mt362xPackAndConvert(u32 recLen);
static void mt362xUnload(TapeParam *tp);
static char *mt362xFunc2String(PpWord funcCode);
/*
** ----------------
** Public Variables
** ----------------
*/
/*
** -----------------
** Private Variables
** -----------------
*/
static TapeParam *firstTape = NULL;
static TapeParam *lastTape = NULL;
static u8 rawBuffer[MaxByteBuf];
#if DEBUG
static FILE *mt362xLog = NULL;
#define OctalColumn(x) (5 * (x) + 1 + 5)
#define AsciiColumn(x) (OctalColumn(5) + 2 + (2 * x))
#define LogLineLength (AsciiColumn(5))
static void mt362xLogFlush(void);
static void mt362xLogByte(int b);
static char mt362xLogBuf[LogLineLength + 1];
static int mt362xLogCol = 0;
/*--------------------------------------------------------------------------
** Purpose: Flush incomplete numeric/ascii data line
**
** Parameters: Name Description.
**
** Returns: nothing
**
**------------------------------------------------------------------------*/
static void mt362xLogFlush(void)
{
if (mt362xLogCol != 0)
{
fputs(mt362xLogBuf, mt362xLog);
}
mt362xLogCol = 0;
memset(mt362xLogBuf, ' ', LogLineLength);
mt362xLogBuf[0] = '\n';
mt362xLogBuf[LogLineLength] = '\0';
}
/*--------------------------------------------------------------------------
** Purpose: Log a byte in octal/ascii form
**
** Parameters: Name Description.
**
** Returns: nothing
**
**------------------------------------------------------------------------*/
static void mt362xLogByte(int b)
{
char octal[10];
int col;
col = OctalColumn(mt362xLogCol);
sprintf(octal, "%04o ", b);
memcpy(mt362xLogBuf + col, octal, 5);
col = AsciiColumn(mt362xLogCol);
mt362xLogBuf[col + 0] = cdcToAscii[(b >> 6) & Mask6];
mt362xLogBuf[col + 1] = cdcToAscii[(b >> 0) & Mask6];
if (++mt362xLogCol == 5)
{
mt362xLogFlush();
}
}
#endif
/*
**--------------------------------------------------------------------------
**
** Public Functions
**
**--------------------------------------------------------------------------
*/
/*--------------------------------------------------------------------------
** Purpose: Initialise tape drive types on 362x controller(7 or 9 track)
**
** Parameters: Name Description.
** eqNo equipment number
** unitNo unit number
** channelNo channel number the device is attached to
** deviceName optional device file name
**
** Returns: Nothing.
**
**------------------------------------------------------------------------*/
void mt362xInit_7(u8 eqNo, u8 unitNo, u8 channelNo, char *deviceName)
{
mt362xInit(eqNo, unitNo, channelNo, deviceName, 7);
}
void mt362xInit_9(u8 eqNo, u8 unitNo, u8 channelNo, char *deviceName)
{
mt362xInit(eqNo, unitNo, channelNo, deviceName, 9);
}
/*--------------------------------------------------------------------------
** Purpose: Initialise 362x connected tape drives.
**
** Parameters: Name Description.
** eqNo equipment number
** unitNo unit number
** channelNo channel number the device is attached to
** deviceName optional device file name
** track number of tracks
**
** Returns: Nothing.
**
**------------------------------------------------------------------------*/
static void mt362xInit(u8 eqNo, u8 unitNo, u8 channelNo, char *deviceName, u8 tracks)
{
DevSlot *dp;
FILE *fcb;
TapeParam *tp;
#if DEBUG
if (mt362xLog == NULL)
{
mt362xLog = fopen("mt362xlog.txt", "wt");
}
#endif
/*
** Attach 362x controller to converter (create if necessary).
*/
dp = dcc6681Attach(channelNo, eqNo, unitNo, DtMt362x);
dp->activate = mt362xActivate;
dp->disconnect = mt362xDisconnect;
dp->func = mt362xFunc;
dp->io = mt362xIo;
/*
** Check if unit has already been configured.
*/
if ((unitNo >= MaxUnits2) || (dp->context[unitNo] != NULL))
{
fprintf(stderr, "(mt362x ) Invalid or duplicate MT372x unit number\n");
exit(1);
}
/*
** Setup tape unit parameter block.
*/
tp = calloc(1, sizeof(TapeParam));
if (tp == NULL)
{
fprintf(stderr, "(mt362x ) Failed to allocate MT362x tape unit context block\n");
exit(1);
}
dp->context[unitNo] = tp;
tp->tracks = tracks;
/*
** Link into list of tape units.
*/
if (lastTape == NULL)
{
firstTape = tp;
}
else
{
lastTape->nextTape = tp;
}
lastTape = tp;
/*
** Open TAP container if file name was specified.
*/
if (deviceName != NULL)
{
strcpy(tp->fileName, deviceName);
fcb = fopen(deviceName, "rb");
if (fcb == NULL)
{
fprintf(stderr, "(mt362x ) Failed to open %s\n", deviceName);
exit(1);
}
dp->fcb[unitNo] = fcb;
tp->blockNo = 0;
tp->unitReady = TRUE;
tp->status = St362xReady | St362xLoadPoint;
}
else
{
dp->fcb[unitNo] = NULL;
tp->unitReady = FALSE;
tp->status = 0;
}
/*
** Setup show_tape values.
*/
tp->channelNo = channelNo;
tp->eqNo = eqNo;
tp->unitNo = unitNo;
/*
** All initially mounted tapes are read only.
*/
tp->ringIn = FALSE;
/*
** Print a friendly message.
*/
printf("(mt362x ) MT362x initialized on channel %o equipment %o unit %o\n", channelNo, eqNo, unitNo);
}
/*--------------------------------------------------------------------------
** Purpose: Load a new tape (operator interface).
**
** Parameters: Name Description.
** params parameters
**
** Returns: Nothing.
**
**------------------------------------------------------------------------*/
void mt362xLoadTape(char *params)
{
int channelNo;
DevSlot *dp;
int equipmentNo;
FILE *fcb;
int numParam;
char outBuf[400];
static char str[200];
TapeParam *tp;
u8 unitMode;
int unitNo;
/*
** Operator inserted a new tape.
*/
numParam = sscanf(params, "%o,%o,%o,%c,%s", &channelNo, &equipmentNo, &unitNo, &unitMode, str);
/*
** Check parameters.
*/
if (numParam != 5)
{
opDisplay("(mt362x ) Not enough or invalid parameters\n");
return;
}
if ((channelNo < 0) || (channelNo >= MaxChannels))
{
opDisplay("(mt362x ) Invalid channel no\n");
return;
}
if ((unitNo < 0) || (unitNo >= MaxUnits2))
{
opDisplay("(mt362x ) Invalid unit no\n");
return;
}
if ((unitMode != 'w') && (unitMode != 'r'))
{
opDisplay("(mt362x ) Invalid ring mode (r/w)\n");
return;
}
if (str[0] == 0)
{
opDisplay("(mt362x ) Invalid file name\n");
return;
}
/*
** Locate the device control block.
*/
dp = dcc6681FindDevice((u8)channelNo, (u8)equipmentNo, DtMt362x);
if (dp == NULL)
{
return;
}
/*
** Check if the unit is even configured.
*/
tp = (TapeParam *)dp->context[unitNo];
if (tp == NULL)
{
sprintf(outBuf, "(mt362x ) Unit %d not allocated\n", unitNo);
opDisplay(outBuf);
return;
}
/*
** Check if the unit has been unloaded.
*/
if (dp->fcb[unitNo] != NULL)
{
sprintf(outBuf, "(mt362x ) Unit %d not unloaded\n", unitNo);
opDisplay(outBuf);
return;
}
/*
** Open the file in the requested mode.
*/
if (unitMode == 'w')
{
fcb = fopen(str, "r+b");
if (fcb == NULL)
{
fcb = fopen(str, "w+b");
}
}
else
{
fcb = fopen(str, "rb");
}
dp->fcb[unitNo] = fcb;
/*
** Check if the open succeeded.
*/
if (fcb == NULL)
{
sprintf(outBuf, "(mt362x ) Failed to open %s\n", str);
opDisplay(outBuf);
return;
}
/*
** Setup show_tape path name.
*/
strcpy(tp->fileName, str);
/*
** Setup status.
*/
mt362xInitStatus(tp);
tp->unitReady = TRUE;
tp->ringIn = unitMode == 'w';
sprintf(outBuf, "(mt362x ) Successfully loaded %s\n", str);
opDisplay(outBuf);
}
/*--------------------------------------------------------------------------
** Purpose: Unload a mounted tape (operator interface).
**
** Parameters: Name Description.
** params parameters
**
** Returns: Nothing.
**
**------------------------------------------------------------------------*/
void mt362xUnloadTape(char *params)
{
DevSlot *dp;
int numParam;
int channelNo;
int equipmentNo;
int unitNo;
TapeParam *tp;
char outBuf[100];
/*
** Operator inserted a new tape.
*/
numParam = sscanf(params, "%o,%o,%o", &channelNo, &equipmentNo, &unitNo);
/*
** Check parameters.
*/
if (numParam != 3)
{
opDisplay("(mt362x ) Not enough or invalid parameters\n");
return;
}
if ((channelNo < 0) || (channelNo >= MaxChannels))
{
opDisplay("(mt362x ) Invalid channel no\n");
return;
}
if ((unitNo < 0) || (unitNo >= MaxUnits2))
{
opDisplay("(mt362x ) Invalid unit no\n");
return;
}
/*
** Locate the device control block.
*/
dp = dcc6681FindDevice((u8)channelNo, (u8)equipmentNo, DtMt362x);
if (dp == NULL)
{
return;
}
/*
** Check if the unit is even configured.
*/
tp = (TapeParam *)dp->context[unitNo];
if (tp == NULL)
{
sprintf(outBuf, "(mt362x ) Unit %d not allocated\n", unitNo);
opDisplay(outBuf);
return;
}
/*
** Check if the unit has been unloaded.
*/
if (dp->fcb[unitNo] == NULL)
{
sprintf(outBuf, "(mt362x ) Unit %d not loaded\n", unitNo);
opDisplay(outBuf);
return;
}
/*
** Close the file.
*/
fclose(dp->fcb[unitNo]);
dp->fcb[unitNo] = NULL;
/*
** Clear show_tape path name.
*/
memset(tp->fileName, 0, MaxFSPath);
/*
** Setup status.
*/
mt362xInitStatus(tp);
sprintf(outBuf, "(mt362x ) Successfully unloaded MT362x on channel %o equipment %o unit %o\n", channelNo, equipmentNo, unitNo);
opDisplay(outBuf);
}
/*--------------------------------------------------------------------------
** Purpose: Show tape status (operator interface).
**
** Parameters: Name Description.
**
**
** Returns: Nothing.
**
**------------------------------------------------------------------------*/
void mt362xShowTapeStatus()
{
TapeParam *tp = firstTape;
char outBuf[MaxFSPath+128];
char type[10];
while (tp)
{
sprintf(type, "362x-%d", tp->tracks);
sprintf(outBuf, " > %-8s C%02o E%02o U%02o", type, tp->channelNo, tp->eqNo, tp->unitNo);
opDisplay(outBuf);
if (tp->unitReady)
{
sprintf(outBuf, " %c %s\n", tp->ringIn ? 'w' : 'r', tp->fileName);
opDisplay(outBuf);
}
else
{
opDisplay(" (idle)\n");
}
tp = tp->nextTape;
}
}
/*--------------------------------------------------------------------------
** Purpose: Reset device status at start of new function.
**
** Parameters: Name Description.
** tp pointer to tape parameters
**
** Returns: Nothing
**
**------------------------------------------------------------------------*/
static void mt362xInitStatus(TapeParam *tp)
{
tp->bcdMode = FALSE;
tp->reverseRead = FALSE;
tp->writing = FALSE;
tp->unitReady = FALSE;
tp->busy = FALSE;
tp->ringIn = FALSE;
tp->fileMark = FALSE;
tp->blockNo = 0;
tp->endOfTape = FALSE;
tp->density = 800;
tp->lostData = FALSE;
tp->endOfOperation = FALSE;
tp->parityError = FALSE;
tp->reserved = FALSE;
tp->rewinding = FALSE;
tp->rewindStart = FALSE;
}
/*--------------------------------------------------------------------------
** Purpose: Reset device status at start of new function.
**
** Parameters: Name Description.
** tp pointer to tape parameters
**
** Returns: Nothing
**
**------------------------------------------------------------------------*/
static void mt362xResetStatus(TapeParam *tp)
{
tp->busy = FALSE;
tp->fileMark = FALSE;
tp->endOfTape = FALSE;
tp->lostData = FALSE;
tp->endOfOperation = FALSE;
tp->parityError = FALSE;
tp->reserved = FALSE;
}
/*--------------------------------------------------------------------------
** Purpose: Setup general status based on current tape parameters.
**
** Parameters: Name Description.
** tp pointer to tape parameters
**
** Returns: Nothing
**
**------------------------------------------------------------------------*/
static void mt362xSetupStatus(TapeParam *tp)
{
tp->status = 0;
if (tp->rewinding)
{
if (cycles - tp->rewindStart > 1000)
{
tp->rewinding = FALSE;
tp->blockNo = 0;
tp->endOfOperation = TRUE;
tp->intStatus |= Int362xEndOfOp;
}
else
{
tp->busy = TRUE;
}
}
else
{
if (active3000Device->selectedUnit != -1)
{
if (tp->unitReady)
{
if (ftell(active3000Device->fcb[active3000Device->selectedUnit]) > MaxTapeSize)
{
tp->endOfTape = TRUE;
}
}
}
}
if (tp->unitReady)
{
tp->status |= St362xReady;
}
if (tp->busy)
{
tp->status |= St362xBusy;
}
if (tp->ringIn)
{
tp->status |= St362xWriteEnable;
}
if (tp->fileMark)
{
tp->status |= St362xFileMark;
}
if (tp->blockNo == 0)
{
tp->status |= St362xLoadPoint;
}
if (tp->endOfTape)
{
tp->status |= St362xEndOfTape;
}
switch (tp->density)
{
case 200:
tp->status |= St362xDensity200Bpi;
break;
case 556:
tp->status |= St362xDensity556Bpi;
break;
case 800:
default:
tp->status |= St362xDensity800Bpi;
break;
}
if (tp->lostData)
{
tp->status |= St362xLostData;
}
if (tp->endOfOperation)
{
tp->status |= St362xEndOfOperation;
}
if (tp->parityError)
{
tp->status |= St362xParityError;
}
if (tp->reserved)
{
tp->status |= St362xUnitReserved;
}
}
/*--------------------------------------------------------------------------
** Purpose: Execute function code on 362x tape controller.
**
** Parameters: Name Description.
** funcCode function code
**
** Returns: FcStatus
**
**------------------------------------------------------------------------*/
static FcStatus mt362xFunc(PpWord funcCode)
{
u32 recLen1;
i8 unitNo;
TapeParam *tp;
FcStatus st;
unitNo = active3000Device->selectedUnit;
if ((unitNo != -1) && (unitNo < MaxUnits2))
{
tp = (TapeParam *)active3000Device->context[unitNo];
}
else
{
tp = NULL;
}
if (tp == NULL)
{
return (FcDeclined);
}
#if DEBUG
mt362xLogFlush();
fprintf(mt362xLog, "\n(mt362x ) %06d PP:%02o CH:%02o Unit:%02o f:%04o T:%-25s > ",
traceSequenceNo,
activePpu->id,
activeDevice->channel->id,
unitNo,
funcCode,
mt362xFunc2String(funcCode));
#endif
switch (funcCode)
{
case Fc362xRelease:
active3000Device->selectedUnit = -1;
st = FcProcessed;
break;
case Fc362xSelectBinary:
tp->bcdMode = FALSE;
st = FcProcessed;
break;
case Fc362xSelectCoded:
tp->bcdMode = TRUE;
st = FcProcessed;
break;
case Fc362xSelect200Bpi:
tp->density = 200;
st = FcProcessed;
break;
case Fc362xSelect556Bpi:
tp->density = 556;
st = FcProcessed;
break;
case Fc362xSelect800Bpi:
tp->density = 800;
st = FcProcessed;
break;
case Fc362xClear:
active3000Device->selectedUnit = -1;
st = FcProcessed;
break;
case Fc362xRewind:
if (tp->unitReady)
{
mt362xResetStatus(tp);
fseek(active3000Device->fcb[unitNo], 0, SEEK_SET);
if (tp->blockNo != 0)
{
if (!tp->rewinding)
{
tp->rewinding = TRUE;
tp->rewindStart = cycles;
}
}
tp->busy = TRUE;
}
st = FcProcessed;
break;
case Fc362xRewindUnload:
if (tp->unitReady)
{
mt362xResetStatus(tp);
tp->blockNo = 0;
tp->unitReady = FALSE;
tp->ringIn = FALSE;
fclose(active3000Device->fcb[unitNo]);
active3000Device->fcb[unitNo] = NULL;
tp->endOfOperation = TRUE;
tp->intStatus |= Int362xEndOfOp;
}
st = FcProcessed;
break;
case Fc362xBackspace:
if (tp->unitReady)
{
if (tp->reverseRead)
{
mt362xFuncForespace();
}
else
{
mt362xFuncBackspace();
}
tp->endOfOperation = TRUE;
tp->intStatus |= Int362xEndOfOp;
}
st = FcProcessed;
break;
case Fc362xSearchFwdFileMark:
if (tp->unitReady)
{
mt362xResetStatus(tp);
do
{
mt362xFuncForespace();
} while (!tp->fileMark && !tp->endOfTape && !tp->parityError);
tp->endOfOperation = TRUE;
tp->intStatus |= Int362xEndOfOp;
}
st = FcProcessed;