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mt669.c
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/*--------------------------------------------------------------------------
**
** Copyright (c) 2003-2011, Tom Hunter
**
** Name: mt669.c
**
** Description:
** Perform emulation of CDC 6600 669 tape drives attached to a
** 7021-21 magnetic tape controller.
**
** 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>
#ifndef WIN32
#include <unistd.h>
#endif
#include <string.h>
#include "const.h"
#include "types.h"
#include "proto.h"
/*
** -----------------
** Private Constants
** -----------------
*/
/*
** MTS tape function codes:
** ========================
*/
/*
** Setup functions.
*/
#define Fc669FormatUnit 00030
#define Fc669LoadConversion1 00131
#define Fc669LoadConversion2 00231
#define Fc669LoadConversion3 00331
/*
** Unit reserve functions.
*/
#define Fc669Connect 00020
#define Fc669Release 00001
#define Fc669ClearReserve 00002
#define Fc669ClearOppositeReserve 00003
/*
** Unit manipulation functions.
*/
#define Fc669Rewind 00010
#define Fc669RewindUnload 00110
#define Fc669SearchTapeMarkF 00015
#define Fc669SearchTapeMarkB 00115
#define Fc669CtrlForespaceFindGap 00214
#define Fc669CtrlBackspaceFindGap 00314
#define Fc669Forespace 00013
#define Fc669Backspace 00113
#define Fc669WriteTapeMark 00051
#define Fc669EraseToEOT 00152
#define Fc669CtrledForespace 00014
#define Fc669CtrledBackspace 00114
#define Fc669StopMotion 00011
/*
** Read functions.
*/
#define Fc669ReadFwd 00040
#define Fc669ReadBkw 00140
/*
** Write functions.
*/
#define Fc669Write 00050
#define Fc669WriteOdd12 00150
#define Fc669WriteOdd 00250
/*
** Status functions.
*/
#define Fc669GeneralStatus 00012
#define Fc669DetailedStatus 00112
#define Fc669CumulativeStatus 00212
#define Fc669UnitReadyStatus 00312
/*
** Non-motion read recovery functions.
*/
#define Fc669SetReadClipNorm 00006
#define Fc669SetReadClipHigh 00106
#define Fc669SetReadClipLow 00206
#define Fc669SetReadClipHyper 00306
#define Fc669ReadSprktDlyNorm 00007
#define Fc669ReadSprktDlyIncr 00107
#define Fc669ReadSprktDlyDecr 00207
#define Fc669OppParity 00005
#define Fc669OppDensity 00105
/*
** Read error recovery functions.
*/
#define Fc669LongForespace 00213
#define Fc669LongBackspace 00313
#define Fc669RereadFwd 00041
#define Fc669RereadBkw 00141
#define Fc669ReadBkwOddLenParity 00340
#define Fc669RereadBkwOddLenParity 00341
#define Fc669RepeatRead 00042
/*
** Write error recovery functions.
*/
#define Fc669Erase 00052
#define Fc669WriteRepos 00017
#define Fc669WriteEraseRepos 00117
#define Fc669WriteReposiCtrl 00217
#define Fc669WriteEraseReposCtrl 00317
#define Fc669EraseRepos 00016
#define Fc669EraseEraseRepos 00116
/*
** Diagnostic functions.
*/
#define Fc669LoadReadRam 00132
#define Fc669LoadWriteRam 00232
#define Fc669LoadReadWriteRam 00332
#define Fc669CopyReadRam 00133
#define Fc669CopyWriteRam 00233
#define Fc669FormatTcuUnitStatus 00034
#define Fc669CopyTcuStatus 00035
#define Fc669SendTcuCmd 00036
#define Fc669SetQuartReadSprktDly 00037
/*
** Undocumented functions.
*/
#define Fc669ConnectRewindRead 00260
#define Fc669MasterClear 00414
#define Fc669ClearUnit 00000
/*
** General status reply:
** =====================
*/
#define St669Alert 04000
#define St669NoUnit 01000
#define St669WriteEnabled 00200
#define St669NineTrack 00100
#define St669OddCount 00040
#define St669TapeMark 00020
#define St669EOT 00010
#define St669BOT 00004
#define St669Busy 00002
#define St669Ready 00001
/*
** Detailed status error codes:
** ============================
*/
#define EcIllegalUnit 001
#define EcUnitNotReady 004
#define EcMissingRing 006
#define EcBlankTape 010
#define EcStopMotion 011 // alert bit not set
#define EcBackPastLoadpoint 030
#define EcIllegalFunction 050
#define EcNoFuncParams 052
#define EcMiscUnitError 047
/*
** Misc constants.
*/
#define MaxPpBuf 40000
#define MaxByteBuf 60000
#define MaxPackedConvBuf (((256 * 8) + 11) / 12)
#define MaxTapeSize 1250000000 // this may need adjusting for shorter real tapes
/*
** -----------------------
** Private Macro Functions
** -----------------------
*/
/*
** -----------------------------------------
** Private Typedef and Structure Definitions
** -----------------------------------------
*/
/*
** MTS controller.
*/
typedef struct ctrlParam
{
FILE *convFileHandle;
u8 readConv[3][256];
u8 writeConv[3][256];
PpWord deviceStatus[9]; // first element not used
PpWord excludedUnits;
bool writing;
} CtrlParam;
/*
** MTS 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 selectedConversion;
bool packedMode;
u8 assemblyMode;
u8 density;
u8 minBlockLength;
/*
** Tape status variables.
*/
bool alert;
bool endOfTape;
bool fileMark;
bool unitReady;
bool ringIn;
bool oddCount;
bool flagBitDetected;
bool rewinding;
bool suppressBot;
u32 rewindStart;
u16 blockCrc;
u8 errorCode;
u32 blockNo;
/*
** I/O buffer.
*/
PpWord frameCount;
PpWord recordLength;
PpWord ioBuffer[MaxPpBuf];
PpWord *bp;
} TapeParam;
/*
** ---------------------------
** Private Function Prototypes
** ---------------------------
*/
static void mt669ResetStatus(TapeParam *tp);
static void mt669SetupGeneralStatus(TapeParam *tp);
static void mt669SetupDetailedStatus(TapeParam *tp);
static void mt669SetupCumulativeStatus(TapeParam *tp);
static void mt669SetupUnitReadyStatus(void);
static FcStatus mt669Func(PpWord funcCode);
static void mt669Io(void);
static void mt669Activate(void);
static void mt669Disconnect(void);
static void mt669PackAndConvert(u32 recLen);
static void mt669FuncRead(void);
static void mt669FuncForespace(void);
static void mt669FuncBackspace(void);
static void mt669FuncReadBkw(void);
static char *mt669Func2String(PpWord funcCode);
/*
** ----------------
** Public Variables
** ----------------
*/
/*
** -----------------
** Private Variables
** -----------------
*/
static TapeParam *firstTape = NULL;
static TapeParam *lastTape = NULL;
static u8 rawBuffer[MaxByteBuf];
#if DEBUG
static FILE *mt669Log = NULL;
#endif
/*
**--------------------------------------------------------------------------
**
** Public Functions
**
**--------------------------------------------------------------------------
*/
/*--------------------------------------------------------------------------
** Purpose: Initialise 669 tape drives.
**
** Parameters: Name Description.
** eqNo equipment number
** unitNo number of the unit to initialise
** channelNo channel number the device is attached to
** deviceName optional device file name
**
** Returns: Nothing.
**
**------------------------------------------------------------------------*/
void mt669Init(u8 eqNo, u8 unitNo, u8 channelNo, char *deviceName)
{
DevSlot *dp;
FILE *fcb;
TapeParam *tp;
(void)eqNo;
#if DEBUG
if (mt669Log == NULL)
{
mt669Log = fopen("mt669log.txt", "wt");
}
#endif
/*
** Attach device to channel.
*/
dp = channelAttach(channelNo, eqNo, DtMt669);
/*
** Setup channel functions.
*/
dp->activate = mt669Activate;
dp->disconnect = mt669Disconnect;
dp->func = mt669Func;
dp->io = mt669Io;
dp->selectedUnit = -1;
/*
** Setup controller context.
*/
if (dp->controllerContext == NULL)
{
dp->controllerContext = calloc(1, sizeof(CtrlParam));
/*
** Optionally read in persistent conversion tables.
*/
if (*persistDir != '\0')
{
CtrlParam *cp = dp->controllerContext;
char fileName[256];
/*
** Try to open existing backing file.
*/
sprintf(fileName, "%s/mt669StoreC%02oE%02o", persistDir, channelNo, eqNo);
cp->convFileHandle = fopen(fileName, "r+b");
if (cp->convFileHandle != NULL)
{
/*
** Read conversion table contents.
*/
if ((fread(cp->writeConv, 1, sizeof(cp->writeConv), cp->convFileHandle) != sizeof(cp->writeConv))
|| (fread(cp->readConv, 1, sizeof(cp->readConv), cp->convFileHandle) != sizeof(cp->readConv)))
{
printf("(mt669 ) Unexpected length of MT669 backing file, clearing tables\n");
memset(cp->writeConv, 0, sizeof(cp->writeConv));
memset(cp->readConv, 0, sizeof(cp->readConv));
}
}
else
{
/*
** Create a new file.
*/
cp->convFileHandle = fopen(fileName, "w+b");
if (cp->convFileHandle == NULL)
{
fprintf(stderr, "(mt669 ) Failed to create MT669 backing file\n");
exit(1);
}
}
}
}
/*
** Setup tape unit parameter block.
*/
tp = calloc(1, sizeof(TapeParam));
if (tp == NULL)
{
fprintf(stderr, "(mt669 ) Failed to allocate MT669 context block\n");
exit(1);
}
dp->context[unitNo] = tp;
/*
** 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, "(mt669 ) Failed to open %s\n", deviceName);
exit(1);
}
dp->fcb[unitNo] = fcb;
tp->blockNo = 0;
tp->unitReady = TRUE;
}
else
{
dp->fcb[unitNo] = NULL;
tp->unitReady = FALSE;
}
/*
** 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("(mt669 ) Initialised on channel %o equipment %o unit %o\n", channelNo, eqNo, unitNo);
}
/*--------------------------------------------------------------------------
** Purpose: Terminate All Devices on this DevSlot.
** Optionally Save Conversion Tables
**
** Parameters: Name Description.
** dp Device pointer.
**
** Returns: Nothing.
**
**------------------------------------------------------------------------*/
void mt669Terminate(DevSlot *dp)
{
CtrlParam *cp = dp->controllerContext;
/*
** Optionally save conversion tables.
*/
if (cp->convFileHandle != NULL)
{
fseek(cp->convFileHandle, 0, SEEK_SET);
if ((fwrite(cp->writeConv, 1, sizeof(cp->writeConv), cp->convFileHandle) != sizeof(cp->writeConv))
|| (fwrite(cp->readConv, 1, sizeof(cp->readConv), cp->convFileHandle) != sizeof(cp->readConv)))
{
fprintf(stderr, "(mt669 ) Error writing MT669 backing file\n");
}
fclose(cp->convFileHandle);
cp->convFileHandle = NULL;
}
}
/*--------------------------------------------------------------------------
** Purpose: Load a new tape (operator interface).
**
** Parameters: Name Description.
** params parameters
**
** Returns: Nothing.
**
**------------------------------------------------------------------------*/
void mt669LoadTape(char *params)
{
static char str[200];
DevSlot *dp;
int numParam;
int channelNo;
int equipmentNo;
int unitNo;
TapeParam *tp;
FILE *fcb;
u8 unitMode;
char outBuf[400];
/*
** Operator inserted a new tape.
*/
numParam = sscanf(params, "%o,%o,%o,%c,%s", &channelNo, &equipmentNo, &unitNo, &unitMode, str);
/*
** Check parameters.
*/
if (numParam != 5)
{
opDisplay("(mt669 ) Not enough or invalid parameters\n");
return;
}
if ((channelNo < 0) || (channelNo >= MaxChannels))
{
opDisplay("(mt669 ) Invalid channel no\n");
return;
}
if ((unitNo < 0) || (unitNo >= MaxUnits))
{
opDisplay("(mt669 ) Invalid unit no\n");
return;
}
if ((unitMode != 'w') && (unitMode != 'r'))
{
opDisplay("(mt669 ) Invalid ring mode (r/w)\n");
return;
}
if (str[0] == 0)
{
opDisplay("(mt669 ) Invalid file name\n");
return;
}
/*
** Locate the device control block.
*/
dp = channelFindDevice((u8)channelNo, DtMt669);
if (dp == NULL)
{
return;
}
/*
** Check if the unit is even configured.
*/
tp = (TapeParam *)dp->context[unitNo];
if (tp == NULL)
{
sprintf(outBuf, "(mt669 ) Unit %d not allocated\n", unitNo);
opDisplay(outBuf);
return;
}
/*
** Check if the unit has been unloaded.
*/
if (dp->fcb[unitNo] != NULL)
{
sprintf(outBuf, "(mt669 ) 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, "(mt669 ) Failed to open %s\n", str);
opDisplay(outBuf);
return;
}
/*
** Setup show_tape path name.
*/
strcpy(tp->fileName, str);
/*
** Setup status.
*/
mt669ResetStatus(tp);
tp->ringIn = unitMode == 'w';
tp->blockNo = 0;
tp->unitReady = TRUE;
sprintf(outBuf, "(mt669 ) Successfully loaded %s\n", str);
opDisplay(outBuf);
}
/*--------------------------------------------------------------------------
** Purpose: Unload a mounted tape (operator interface).
**
** Parameters: Name Description.
** params parameters
**
** Returns: Nothing.
**
**------------------------------------------------------------------------*/
void mt669UnloadTape(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("(mt669 ) Not enough or invalid parameters\n");
return;
}
if ((channelNo < 0) || (channelNo >= MaxChannels))
{
opDisplay("(mt669 ) Invalid channel no\n");
return;
}
if ((unitNo < 0) || (unitNo >= MaxUnits2))
{
opDisplay("(mt669 ) Invalid unit no\n");
return;
}
/*
** Locate the device control block.
*/
dp = channelFindDevice((u8)channelNo, DtMt669);
if (dp == NULL)
{
return;
}
/*
** Check if the unit is even configured.
*/
tp = (TapeParam *)dp->context[unitNo];
if (tp == NULL)
{
sprintf(outBuf, "(mt669 ) Unit %d not allocated\n", unitNo);
opDisplay(outBuf);
return;
}
/*
** Check if the unit has been unloaded.
*/
if (dp->fcb[unitNo] == NULL)
{
sprintf(outBuf, "(mt669 ) 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.
*/
mt669ResetStatus(tp);
tp->unitReady = FALSE;
tp->ringIn = FALSE;
tp->rewinding = FALSE;
tp->rewindStart = 0;
tp->blockCrc = 0;
tp->blockNo = 0;
sprintf(outBuf, "(mt669 ) Successfully unloaded MT669 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 mt669ShowTapeStatus()
{
TapeParam *tp = firstTape;
char outBuf[MaxFSPath+128];
while (tp)
{
sprintf(outBuf, " > %-8s C%02o E%02o U%02o", "669", 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;
}
}
/*
**--------------------------------------------------------------------------
**
** Private Functions
**
**--------------------------------------------------------------------------
*/
/*--------------------------------------------------------------------------
** Purpose: Reset device status at start of new function.
**
** Parameters: Name Description.
** tp pointer to tape parameters
**
** Returns: Nothing
**
**------------------------------------------------------------------------*/
static void mt669ResetStatus(TapeParam *tp)
{
if (tp != NULL)
{
tp->alert = FALSE;
tp->endOfTape = FALSE;
tp->fileMark = FALSE;
tp->oddCount = FALSE;
tp->flagBitDetected = FALSE;
tp->suppressBot = FALSE;
tp->errorCode = 0;
}
}
/*--------------------------------------------------------------------------
** Purpose: Setup general status based on current tape parameters.
**
** Parameters: Name Description.
** tp pointer to tape parameters
**
** Returns: Nothing
**
**------------------------------------------------------------------------*/
static void mt669SetupGeneralStatus(TapeParam *tp)
{
CtrlParam *cp = activeDevice->controllerContext;
if (tp == NULL)
{
cp->deviceStatus[1] = St669NineTrack;
cp->deviceStatus[2] = 0;
return;
}
cp->deviceStatus[1] = St669NineTrack;
if (tp->alert)
{
cp->deviceStatus[1] |= St669Alert;
}
if (tp->ringIn)
{
cp->deviceStatus[1] |= St669WriteEnabled;
}
if (tp->oddCount)
{
cp->deviceStatus[1] |= St669OddCount;
}
if (tp->fileMark)
{
cp->deviceStatus[1] |= St669TapeMark;
}
if (tp->endOfTape)
{
cp->deviceStatus[1] |= St669EOT;
}
if (tp->rewinding)
{
cp->deviceStatus[1] |= St669Busy;
if (cycles - tp->rewindStart > 1000)
{
tp->rewinding = FALSE;
tp->blockNo = 0;
}
}
else
{
if ((tp->blockNo == 0) && !tp->suppressBot)
{
cp->deviceStatus[1] |= St669BOT;
}
if (tp->unitReady)
{
cp->deviceStatus[1] |= St669Ready;
if (ftell(activeDevice->fcb[activeDevice->selectedUnit]) > MaxTapeSize)
{
cp->deviceStatus[1] |= St669EOT;
}
}
}
cp->deviceStatus[2] = (tp->blockCrc & Mask9) << 3;
}
/*--------------------------------------------------------------------------
** Purpose: Setup detailed status based on current tape parameters.
**
** Parameters: Name Description.
** tp pointer to tape parameters
**
** Returns: Nothing
**
**------------------------------------------------------------------------*/
static void mt669SetupDetailedStatus(TapeParam *tp)
{
CtrlParam *cp = activeDevice->controllerContext;
if (tp == NULL)
{
cp->deviceStatus[1] = 0;
cp->deviceStatus[2] = 0;
cp->deviceStatus[3] = 0;
cp->deviceStatus[4] = 0;
cp->deviceStatus[5] = 0;
cp->deviceStatus[6] = 0;
cp->deviceStatus[7] = 0;
cp->deviceStatus[8] = 0;
return;
}
cp->deviceStatus[1] = tp->errorCode;
cp->deviceStatus[2] = 0;
cp->deviceStatus[3] = 0;
if (tp->flagBitDetected)
{
cp->deviceStatus[3] |= 1 << 5;
}
if (tp->oddCount)
{
cp->deviceStatus[3] |= 1 << 10;
}
cp->deviceStatus[4] = 0;
/*
** Report: forward tape motion, speed=100 ips, density=1600 cpi
** and configured unit number.
*/
cp->deviceStatus[5] = 00600 + activeDevice->selectedUnit;
cp->deviceStatus[6] = 0;
/*
** 24 bit last read frame count or zero if last operation was a
** successful write.
*/
cp->deviceStatus[7] = (tp->frameCount >> 12) & Mask12;
cp->deviceStatus[8] = (tp->frameCount >> 0) & Mask12;
}
/*--------------------------------------------------------------------------
** Purpose: Setup cumulative status based on current tape parameters.
**
** Parameters: Name Description.
** tp pointer to tape parameters
**
** Returns: Nothing
**
**------------------------------------------------------------------------*/
static void mt669SetupCumulativeStatus(TapeParam *tp)
{
CtrlParam *cp = activeDevice->controllerContext;
if (tp == NULL)
{
cp->deviceStatus[1] = 0;
cp->deviceStatus[2] = 0;
cp->deviceStatus[3] = 0;
cp->deviceStatus[4] = 0;
cp->deviceStatus[5] = 0;
cp->deviceStatus[6] = 0;
cp->deviceStatus[7] = 0;
cp->deviceStatus[8] = 0;
return;
}
/*
** Report: forward tape motion, speed=100 ips, density=1600 cpi
** and configured unit number.
*/
cp->deviceStatus[1] = 00600 + activeDevice->selectedUnit;
cp->deviceStatus[2] = activeDevice->selectedUnit << 8;
cp->deviceStatus[3] = 0;
cp->deviceStatus[4] = 0;
cp->deviceStatus[5] = 0;
cp->deviceStatus[6] = 0;
cp->deviceStatus[7] = 0;
cp->deviceStatus[8] = 0;
}
/*--------------------------------------------------------------------------
** Purpose: Setup all tape unit's ready status.
**
** Parameters: Name Description.
**