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|
/* id_fd.c: Interdata floppy disk simulator
Copyright (c) 2001-2005, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
fd M46-630 floppy disk
A diskette consists of 77 tracks, each with 26 sectors of 128B. The
Interdata floppy uses a logical record numbering scheme from 1 to 2002.
Physical tracks are numbered 0-76, physical sectors 1-26.
To allow for deleted data handling, a directory is appended to the end
of the image, one byte per LRN. Zero (the default) is a normal record,
non-zero a deleted record.
*/
#include "id_defs.h"
#define FD_NUMTR 77 /* tracks/disk */
#define FD_NUMSC 26 /* sectors/track */
#define FD_NUMBY 128 /* bytes/sector */
#define FD_NUMLRN (FD_NUMTR * FD_NUMSC) /* LRNs/disk */
#define FD_SIZE (FD_NUMLRN * FD_NUMBY) /* bytes/disk */
#define FD_NUMDR 4 /* drives/controller */
#define UNIT_V_WLK (UNIT_V_UF) /* write locked */
#define UNIT_WLK (1u << UNIT_V_UF)
#define UNIT_WPRT (UNIT_WLK | UNIT_RO) /* write protect */
#define LRN u3 /* last LRN */
#define FNC u4 /* last function */
#define GET_DA(x) (((x) - 1) * FD_NUMBY)
#define GET_TRK(x) (((x) - 1) / FD_NUMSC)
#define GET_SEC(x) ((((x) - 1) % FD_NUMSC) + 1)
#define LRN_BOOT 5 /* boot block LRN */
/* Command byte */
#define CMD_V_UNIT 4 /* unit */
#define CMD_M_UNIT 0x3
#define GET_UNIT(x) (((x) >> CMD_V_UNIT) & CMD_M_UNIT)
#define CMD_V_FNC 0 /* function */
#define CMD_M_FNC 0xF
#define GET_FNC(x) (((x) >> CMD_V_FNC) & CMD_M_FNC)
#define FNC_RD 0x1 /* read */
#define FNC_WR 0x2 /* write */
#define FNC_RDID 0x3 /* read ID */
#define FNC_RSTA 0x4 /* read status */
#define FNC_DEL 0x5 /* write deleted */
#define FNC_BOOT 0x6 /* boot */
#define FNC_STOP 0x7 /* stop */
#define FNC_RESET 0x8 /* reset */
#define FNC_FMT 0x9 /* format NI */
#define FNC_STOPPING 0x10 /* stopping */
/* Status byte, * = dynamic */
#define STA_WRP 0x80 /* *write prot */
#define STA_DEF 0x40 /* def track NI */
#define STA_DEL 0x20 /* del record */
#define STA_ERR 0x10 /* error */
#define STA_IDL 0x02 /* idle */
#define STA_OFL 0x01 /* fault */
#define STA_MASK (STA_DEF|STA_DEL|STA_ERR|STA_BSY|STA_IDL)
#define SET_EX (STA_ERR) /* set EX */
/* Extended status, 6 bytes, * = dynamic */
#define ES_SIZE 6
#define ES0_HCRC 0x80 /* ID CRC NI */
#define ES0_DCRC 0x40 /* data CRC NI */
#define ES0_LRN 0x20 /* illegal LRN */
#define ES0_WRP 0x10 /* *write prot */
#define ES0_ERR 0x08 /* error */
#define ES0_DEF 0x04 /* def trk NI */
#define ES0_DEL 0x02 /* del rec NI */
#define ES0_FLT 0x01 /* fault */
#define ES1_TK0 0x80 /* track 0 */
#define ES1_NRDY 0x40 /* not ready */
#define ES1_NOAM 0x20 /* no addr mk NI */
#define ES1_CMD 0x10 /* illegal cmd */
#define ES1_SKE 0x08 /* seek err NI */
#define ES1_UNS 0x04 /* unsafe NI */
#define ES1_UNIT 0x03 /* unit # */
/* Processing options for commands */
#define C_RD 0x1 /* cmd reads disk */
#define C_WD 0x2 /* cmd writes disk */
extern uint32 int_req[INTSZ], int_enb[INTSZ];
uint32 fd_sta = 0; /* status */
uint32 fd_cmd = 0; /* command */
uint32 fd_db = 0; /* data buffer */
uint32 fd_bptr = 0; /* buffer pointer */
uint8 fdxb[FD_NUMBY] = { 0 }; /* sector buffer */
uint8 fd_es[FD_NUMDR][ES_SIZE] = { 0 }; /* ext status */
uint32 fd_lrn = 0; /* log rec # */
uint32 fd_wdv = 0; /* wd valid */
uint32 fd_stopioe = 1; /* stop on error */
uint32 fd_arm = 0; /* intr arm */
int32 fd_ctime = 100; /* command time */
int32 fd_stime = 10; /* seek, per LRN */
int32 fd_xtime = 1; /* tr set time */
static uint32 ctab[16] = {
0, C_RD, C_WD, 0, /* 0, rd, wr, 0 */
0, C_WD, C_RD, 0, /* 0, del, boot, 0 */
0, 0, 0, 0,
0, 0, 0, 0
};
DEVICE fd_dev;
uint32 fd (uint32 dev, uint32 op, uint32 dat);
t_stat fd_svc (UNIT *uptr);
t_stat fd_reset (DEVICE *dptr);
t_stat fd_clr (DEVICE *dptr);
t_stat fd_boot (int32 unitno, DEVICE *dptr);
t_bool fd_dte (UNIT *uptr, t_bool wr);
uint32 fd_crc (uint32 crc, uint32 dat, uint32 cnt);
void fd_done (uint32 u, uint32 nsta, uint32 nes0, uint32 nes1);
void sched_seek (UNIT *uptr, int32 newlrn);
/* FD data structures
fd_dev FD device descriptor
fd_unit FD unit list
fd_reg FD register list
fd_mod FD modifier list
*/
DIB fd_dib = { d_FD, -1, v_FD, NULL, &fd, NULL };
UNIT fd_unit[] = {
{ UDATA (&fd_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+
UNIT_BUFABLE+UNIT_MUSTBUF, FD_SIZE + FD_NUMLRN) },
{ UDATA (&fd_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+
UNIT_BUFABLE+UNIT_MUSTBUF, FD_SIZE + FD_NUMLRN) },
{ UDATA (&fd_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+
UNIT_BUFABLE+UNIT_MUSTBUF, FD_SIZE + FD_NUMLRN) },
{ UDATA (&fd_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_DISABLE+
UNIT_BUFABLE+UNIT_MUSTBUF, FD_SIZE + FD_NUMLRN) }
};
REG fd_reg[] = {
{ HRDATA (CMD, fd_cmd, 8) },
{ HRDATA (STA, fd_sta, 8) },
{ HRDATA (BUF, fd_db, 8) },
{ HRDATA (LRN, fd_lrn, 16) },
{ BRDATA (ESTA, fd_es, 16, 8, ES_SIZE * FD_NUMDR) },
{ BRDATA (DBUF, fdxb, 16, 8, FD_NUMBY) },
{ HRDATA (DBPTR, fd_bptr, 8) },
{ FLDATA (WDV, fd_wdv, 0) },
{ FLDATA (IREQ, int_req[l_FD], i_FD) },
{ FLDATA (IENB, int_enb[l_FD], i_FD) },
{ FLDATA (IARM, fd_arm, 0) },
{ DRDATA (CTIME, fd_ctime, 24), PV_LEFT },
{ DRDATA (STIME, fd_stime, 24), PV_LEFT },
{ DRDATA (XTIME, fd_xtime, 24), PV_LEFT },
{ FLDATA (STOP_IOE, fd_stopioe, 0) },
{ URDATA (ULRN, fd_unit[0].LRN, 16, 16, 0, FD_NUMDR, REG_HRO) },
{ URDATA (UFNC, fd_unit[0].FNC, 16, 8, 0, FD_NUMDR, REG_HRO) },
{ HRDATA (DEVNO, fd_dib.dno, 8), REG_HRO },
{ NULL }
};
MTAB fd_mod[] = {
{ UNIT_WLK, 0, "write enabled", "WRITEENABLED", NULL },
{ UNIT_WLK, UNIT_WLK, "write locked", "LOCKED", NULL },
{ MTAB_XTD|MTAB_VDV, 0, "DEVNO", "DEVNO",
&set_dev, &show_dev, NULL },
{ 0 }
};
DEVICE fd_dev = {
"FD", fd_unit, fd_reg, fd_mod,
FD_NUMDR, 16, 20, 1, 16, 8,
NULL, NULL, &fd_reset,
&fd_boot, NULL, NULL,
&fd_dib, DEV_DISABLE
};
/* Floppy disk: IO routine */
uint32 fd (uint32 dev, uint32 op, uint32 dat)
{
int32 u, t, fnc;
UNIT *uptr;
fnc = GET_FNC (fd_cmd); /* get fnc */
u = GET_UNIT (fd_cmd); /* get unit */
uptr = fd_dev.units + u;
switch (op) { /* case IO op */
case IO_ADR: /* select */
return BY; /* byte only */
case IO_RD: /* read */
if (fd_sta & (STA_IDL | STA_BSY)) return fd_db; /* idle, busy? */
if (fd_bptr < FD_NUMBY) fd_db = fdxb[fd_bptr++];/* get byte */
if (fd_bptr >= FD_NUMBY) { /* buf end? */
if (ctab[fnc] & C_RD) { /* disk read? */
sched_seek (uptr, uptr->LRN + 1); /* sched read */
fd_sta = fd_sta | STA_BSY; /* set busy */
}
else fd_bptr = 0; /* just wrap */
}
if ((ctab[fnc] & C_RD) && fd_arm) /* if rd & arm, */
SET_INT (v_FD); /* interrupt */
return fd_db; /* return buf */
case IO_WD: /* write */
if (fd_sta & STA_IDL) { /* idle? */
fd_lrn = ((fd_lrn << 8) | dat) & DMASK16; /* insert byte */
fd_wdv = 1;
break;
}
if (fd_bptr < FD_NUMBY) /* if room, */
fdxb[fd_bptr++] = fd_db = dat; /* store byte */
if (fd_bptr >= FD_NUMBY) { /* buf end? */
if (ctab[fnc] & C_WD) { /* disk write? */
sched_seek (uptr, uptr->LRN + 1); /* sched write */
fd_sta = fd_sta | STA_BSY; /* set busy */
}
else fd_bptr = 0; /* just wrap */
}
if ((ctab[fnc] & C_WD) && fd_arm) /* if wr & arm, */
SET_INT (v_FD); /* interrupt */
break;
case IO_SS: /* status */
t = fd_sta & STA_MASK; /* get status */
if ((uptr->flags & UNIT_ATT) == 0) t = t | STA_DU;
if (t & SET_EX) t = t | STA_EX; /* test for ex */
return t;
case IO_OC: /* command */
fd_arm = int_chg (v_FD, dat, fd_arm); /* upd int ctrl */
fnc = GET_FNC (dat); /* new fnc */
fd_cmd = dat; /* save cmd */
u = GET_UNIT (dat); /* get unit */
uptr = fd_dev.units + u;
if (fnc == FNC_STOP) { /* stop? */
uptr->FNC = uptr->FNC | FNC_STOPPING; /* flag stop */
if (sim_is_active (uptr)) break; /* busy? cont */
if (ctab[GET_FNC (uptr->FNC)] & C_WD) { /* write? */
sched_seek (uptr, uptr->LRN + 1); /* sched write */
fd_sta = fd_sta | STA_BSY; /* set busy */
}
else fd_done (u, 0, 0, 0); /* nrml done */
break;
}
else if (fd_sta & STA_IDL) { /* must be idle */
if (fnc != FNC_RSTA) { /* !rd status */
fd_sta = STA_BSY; /* busy, !idle */
fd_es[u][0] = 0;
fd_es[u][1] = u; /* init ext sta */
}
else fd_sta = (fd_sta & ~STA_IDL) | STA_BSY;
if (fnc == FNC_BOOT) t = LRN_BOOT; /* boot? fixed sec */
else if (fd_wdv) t = fd_lrn; /* valid data? use */
else t = uptr->LRN; /* use prev */
fd_wdv = 0; /* data invalid */
fd_bptr = 0; /* init buffer */
uptr->FNC = fnc; /* save function */
uptr->LRN = t; /* save LRN */
if (ctab[fnc] & C_RD) sched_seek (uptr, t); /* seek now? */
else sim_activate (uptr, fd_ctime); /* start cmd */
}
break;
}
return 0;
}
/* Unit service; the action to be taken depends on command */
t_stat fd_svc (UNIT *uptr)
{
uint32 i, u, tk, sc, crc, fnc, da;
uint8 *fbuf = uptr->filebuf;
u = uptr - fd_dev.units; /* get unit number */
fnc = GET_FNC (uptr->FNC); /* get function */
switch (fnc) { /* case on function */
case FNC_RESET: /* reset */
fd_clr (&fd_dev); /* clear device */
fd_done (u, 0, 0, 0); /* set idle */
return SCPE_OK;
case FNC_STOP: /* stop */
fd_done (u, 0, 0, 0); /* set idle */
return SCPE_OK;
case FNC_BOOT: /* boot, buf empty */
case FNC_RD: /* read, buf empty */
if (uptr->FNC & FNC_STOPPING) break; /* stopped? */
if (fd_dte (uptr, FALSE)) return SCPE_OK; /* xfr error? */
da = GET_DA (uptr->LRN); /* get disk addr */
for (i = 0; i < FD_NUMBY; i++) /* read sector */
fdxb[i] = fbuf[da + i];
if (fbuf[FD_SIZE + uptr->LRN - 1]) { /* deleted? set err */
fd_sta = fd_sta | STA_DEL;
fd_es[u][0] = fd_es[u][0] | ES0_DEL;
}
fd_es[u][2] = GET_SEC (uptr->LRN); /* set ext sec/trk */
fd_es[u][3] = GET_TRK (uptr->LRN);
fd_bptr = 0; /* init buf */
uptr->LRN = uptr->LRN + 1; /* next block */
break;
case FNC_WR: case FNC_DEL: /* write block */
if (fd_dte (uptr, TRUE)) return SCPE_OK; /* xfr error? */
if (fd_bptr) { /* any transfer? */
da = GET_DA (uptr->LRN); /* get disk addr */
for (i = fd_bptr; i < FD_NUMBY; i++) /* pad sector */
fdxb[i] = fd_db;
for (i = 0; i < FD_NUMBY; i++) /* write sector */
fbuf[da + i] = fdxb[i]; /* then dir */
fbuf[FD_SIZE + uptr->LRN - 1] = ((fnc == FNC_DEL)? 1: 0);
uptr->hwmark = uptr->capac; /* rewrite all */
fd_es[u][2] = GET_SEC (uptr->LRN); /* set ext sec/trk */
fd_es[u][3] = GET_TRK (uptr->LRN);
fd_bptr = 0; /* init buf */
uptr->LRN = uptr->LRN + 1; /* next block */
}
break;
case FNC_RSTA: /* read status */
if (uptr->flags & UNIT_WPRT) /* wr protected? */
fd_es[u][0] = fd_es[u][0] | ES0_WRP;
if (GET_TRK (uptr->LRN) == 0) /* on track 0? */
fd_es[u][1] = fd_es[u][1] | ES1_TK0;
if ((uptr->flags & UNIT_BUF) == 0) { /* not attached? */
fd_es[u][0] = fd_es[u][0] | ES0_FLT; /* set err */
fd_es[u][1] = fd_es[u][1] | ES1_NRDY;
}
for (i = 0; i < ES_SIZE; i++) fdxb[i] = fd_es[u][i]; /* copy to buf */
for (i = ES_SIZE; i < FD_NUMBY; i++) fdxb[i] = 0;
break;
case FNC_RDID: /* read ID */
if ((uptr->flags & UNIT_BUF) == 0) { /* not attached? */
fd_done (u, STA_ERR, ES0_ERR | ES0_FLT, ES1_NRDY);
return SCPE_OK;
}
for (i = 0; i < FD_NUMBY; i++) fdxb[i] = 0; /* clr buf */
tk = GET_TRK (uptr->LRN); /* get track */
sc = GET_SEC (uptr->LRN); /* get sector */
fdxb[0] = tk & 0xFF; /* store track */
fdxb[2] = sc & 0xFF; /* store sector */
crc = fd_crc (0xFFFF, 0xFE00, 8); /* CRC addr mark */
crc = fd_crc (crc, tk << 8, 16); /* CRC track */
crc = fd_crc (crc, sc << 8, 16); /* CRC sector */
fdxb[4] = (crc >> 8) & 0xFF; /* store CRC */
fdxb[5] = crc & 0xFF;
break;
case FNC_FMT: /* format */
default:
fd_done (u, STA_ERR, ES0_ERR, ES1_CMD); /* ill cmd */
uptr->LRN = 1; /* on track 0 */
return SCPE_OK;
}
if (uptr->FNC & FNC_STOPPING) { /* stopping? */
uptr->FNC = FNC_STOP; /* fnc = STOP */
sim_activate (uptr, fd_ctime); /* schedule */
}
fd_sta = fd_sta & ~STA_BSY; /* clear busy */
if (fd_arm) SET_INT (v_FD); /* if armed, int */
return SCPE_OK;
}
/* Schedule seek */
void sched_seek (UNIT *uptr, int32 newlrn)
{
int32 diff = newlrn - uptr->LRN; /* LRN diff */
if (diff < 0) diff = -diff; /* ABS */
if (diff < 10) diff = 10; /* MIN 10 */
sim_activate (uptr, diff * fd_stime); /* schedule */
return;
}
/* Command complete */
void fd_done (uint32 u, uint32 nsta, uint32 nes0, uint32 nes1)
{
fd_sta = (fd_sta | STA_IDL | nsta) & ~STA_BSY; /* set idle */
if (fd_arm) SET_INT (v_FD); /* if armed, int */
fd_es[u][0] = fd_es[u][0] | nes0; /* set ext state */
fd_es[u][1] = fd_es[u][1] | nes1;
return;
}
/* Test for data transfer error */
t_bool fd_dte (UNIT *uptr, t_bool wr)
{
uint32 u = uptr - fd_dev.units;
if ((uptr->flags & UNIT_BUF) == 0) { /* not attached? */
fd_done (u, STA_ERR, ES0_ERR | ES0_FLT, ES1_NRDY);
return TRUE;
}
if (wr && (uptr->flags & UNIT_WPRT)) { /* wr protected? */
fd_done (u, STA_ERR, ES0_ERR | ES0_WRP, 0);
return TRUE;
}
if ((uptr->LRN == 0) || (uptr->LRN > FD_NUMLRN)) { /* bad LRN? */
fd_done (u, STA_ERR, ES0_ERR | ES0_LRN, 0);
return TRUE;
}
return FALSE;
}
/* Header CRC calculation */
uint32 fd_crc (uint32 crc, uint32 dat, uint32 cnt)
{
uint32 i, wrk;
for (i = 0; i < cnt; i++) {
wrk = crc ^ dat;
crc = (crc << 1) & DMASK16;
if (wrk & SIGN16) crc = ((crc ^ 0x1020) + 1) & DMASK16;
dat = (dat << 1) & DMASK16;
}
return crc;
}
/* Reset routine */
t_stat fd_clr (DEVICE *dptr)
{
int32 i, j;
UNIT *uptr;
fd_sta = STA_IDL; /* idle */
fd_cmd = 0; /* clear state */
fd_db = 0;
fd_bptr = 0;
fd_lrn = 1;
fd_wdv = 0;
for (i = 0; i < FD_NUMBY; i++) fdxb[i] = 0; /* clr xfr buf */
for (i = 0; i < FD_NUMDR; i++) { /* loop thru units */
for (j = 0; j < ES_SIZE; j++) fd_es[i][j] = 0; /* clr ext sta */
fd_es[i][2] = 1; /* sector 1 */
uptr = fd_dev.units + i;
sim_cancel (uptr); /* stop drive */
uptr->LRN = 1; /* clear state */
uptr->FNC = 0;
}
return SCPE_OK;
}
t_stat fd_reset (DEVICE *dptr)
{
CLR_INT (v_FD); /* clear int */
CLR_ENB (v_FD); /* disable int */
fd_arm = 0; /* disarm int */
return fd_clr (dptr);;
}
/* Bootstrap routine */
#define BOOT_START 0x50
#define BOOT_LEN (sizeof (boot_rom) / sizeof (uint8))
static uint8 boot_rom[] = {
0xD5, 0x00, 0x00, 0xCF, /* ST: AL CF */
0x43, 0x00, 0x00, 0x80 /* BR 80 */
};
t_stat fd_boot (int32 unitno, DEVICE *dptr)
{
extern uint32 PC, dec_flgs;
extern uint16 decrom[];
if (decrom[0xD5] & dec_flgs) return SCPE_NOFNC; /* AL defined? */
IOWriteBlk (BOOT_START, BOOT_LEN, boot_rom); /* copy boot */
IOWriteB (AL_DEV, fd_dib.dno); /* set dev no */
IOWriteB (AL_IOC, 0x86 + (unitno << CMD_V_UNIT)); /* set dev cmd, unit num */
IOWriteB (AL_SCH, 0); /* clr sch dev no */
PC = BOOT_START;
return SCPE_OK;
}
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