/* $NetBSD: fd.c,v 1.15 2001/05/19 12:04:07 tsutsui Exp $ */ /*- * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Don Ahn. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)fd.c 7.4 (Berkeley) 5/25/91 */ /* * Floppy formatting facilities merged from FreeBSD fd.c driver: * Id: fd.c,v 1.53 1995/03/12 22:40:56 joerg Exp * which carries the same copyright/redistribution notice as shown above with * the addition of the following statement before the "Redistribution and * use ..." clause: * * Copyright (c) 1993, 1994 by * jc@irbs.UUCP (John Capo) * vak@zebub.msk.su (Serge Vakulenko) * ache@astral.msk.su (Andrew A. Chernov) * * Copyright (c) 1993, 1994, 1995 by * joerg_wunsch@uriah.sax.de (Joerg Wunsch) * dufault@hda.com (Peter Dufault) */ #include "rnd.h" #include "opt_ddb.h" /* * XXX This driver should be properly MI'd some day, but this allows us * XXX to eliminate a lot of code duplication for now. */ #if !defined(alpha) && !defined(bebox) && !defined(i386) && !defined(prep) && !defined(atari) #error platform not supported by this driver, yet #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if NRND > 0 #include #endif #include #include #include #include #if defined(atari) #include bdev_decl(fd); cdev_decl(fd); /* * On the atari, it is configured as fdcisa */ #define FDCCF_DRIVE FDCISACF_DRIVE #define FDCCF_DRIVE_DEFAULT FDCISACF_DRIVE_DEFAULT #define fd_cd fdisa_cd #define fd_ca fdisa_ca #else #include #endif /* defined(atari) */ #include #include #include #include #include #if defined(i386) #include /* for NVRAM access */ #include #include "mca.h" #if NMCA > 0 #include /* for MCA_system */ #endif #endif /* i386 */ #define FDUNIT(dev) (minor(dev) / 8) #define FDTYPE(dev) (minor(dev) % 8) /* XXX misuse a flag to identify format operation */ #define B_FORMAT B_XXX /* controller driver configuration */ int fdprint __P((void *, const char *)); /* * Floppies come in various flavors, e.g., 1.2MB vs 1.44MB; here is how * we tell them apart. */ struct fd_type { int sectrac; /* sectors per track */ int heads; /* number of heads */ int seccyl; /* sectors per cylinder */ int secsize; /* size code for sectors */ int datalen; /* data len when secsize = 0 */ int steprate; /* step rate and head unload time */ int gap1; /* gap len between sectors */ int gap2; /* formatting gap */ int cyls; /* total num of cylinders */ int size; /* size of disk in sectors */ int step; /* steps per cylinder */ int rate; /* transfer speed code */ u_char fillbyte; /* format fill byte */ u_char interleave; /* interleave factor (formatting) */ const char *name; }; #if NMCA > 0 /* MCA - specific entries */ const struct fd_type mca_fd_types[] = { { 18,2,36,2,0xff,0x0f,0x1b,0x6c,80,2880,1,FDC_500KBPS,0xf6,1, "1.44MB" }, /* 1.44MB diskette - XXX try 16ms step rate */ { 9,2,18,2,0xff,0x4f,0x2a,0x50,80,1440,1,FDC_250KBPS,0xf6,1, "720KB" }, /* 3.5 inch 720kB diskette - XXX try 24ms step rate */ }; #endif /* NMCA > 0 */ /* The order of entries in the following table is important -- BEWARE! */ #if defined(atari) const struct fd_type fd_types[] = { { 9,2,18,2,0xff,0xdf,0x2a,0x50,40, 720,1,FDC_250KBPS,0xf6,1, "360KB/PC" }, /* 360kB PC diskettes */ { 9,2,18,2,0xff,0xdf,0x2a,0x50,80,1440,1,FDC_250KBPS,0xf6,1, "720KB" }, /* 3.5 inch 720kB diskette */ { 18,2,36,2,0xff,0xcf,0x1b,0x6c,80,2880,1,FDC_500KBPS,0xf6,1, "1.44MB" }, /* 1.44MB diskette */ }; #else const struct fd_type fd_types[] = { { 18,2,36,2,0xff,0xcf,0x1b,0x6c,80,2880,1,FDC_500KBPS,0xf6,1, "1.44MB" }, /* 1.44MB diskette */ { 15,2,30,2,0xff,0xdf,0x1b,0x54,80,2400,1,FDC_500KBPS,0xf6,1, "1.2MB" }, /* 1.2 MB AT-diskettes */ { 9,2,18,2,0xff,0xdf,0x23,0x50,40, 720,2,FDC_300KBPS,0xf6,1, "360KB/AT" }, /* 360kB in 1.2MB drive */ { 9,2,18,2,0xff,0xdf,0x2a,0x50,40, 720,1,FDC_250KBPS,0xf6,1, "360KB/PC" }, /* 360kB PC diskettes */ { 9,2,18,2,0xff,0xdf,0x2a,0x50,80,1440,1,FDC_250KBPS,0xf6,1, "720KB" }, /* 3.5 inch 720kB diskette */ { 9,2,18,2,0xff,0xdf,0x23,0x50,80,1440,1,FDC_300KBPS,0xf6,1, "720KB/x" }, /* 720kB in 1.2MB drive */ { 9,2,18,2,0xff,0xdf,0x2a,0x50,40, 720,2,FDC_250KBPS,0xf6,1, "360KB/x" }, /* 360kB in 720kB drive */ }; #endif /* defined(atari) */ /* software state, per disk (with up to 4 disks per ctlr) */ struct fd_softc { struct device sc_dev; struct disk sc_dk; const struct fd_type *sc_deftype; /* default type descriptor */ struct fd_type *sc_type; /* current type descriptor */ struct fd_type sc_type_copy; /* copy for fiddling when formatting */ struct callout sc_motoron_ch; struct callout sc_motoroff_ch; daddr_t sc_blkno; /* starting block number */ int sc_bcount; /* byte count left */ int sc_opts; /* user-set options */ int sc_skip; /* bytes already transferred */ int sc_nblks; /* number of blocks currently tranferring */ int sc_nbytes; /* number of bytes currently tranferring */ int sc_drive; /* physical unit number */ int sc_flags; #define FD_OPEN 0x01 /* it's open */ #define FD_MOTOR 0x02 /* motor should be on */ #define FD_MOTOR_WAIT 0x04 /* motor coming up */ int sc_cylin; /* where we think the head is */ void *sc_sdhook; /* saved shutdown hook for drive. */ TAILQ_ENTRY(fd_softc) sc_drivechain; int sc_ops; /* I/O ops since last switch */ struct buf_queue sc_q; /* pending I/O requests */ int sc_active; /* number of active I/O operations */ #if NRND > 0 rndsource_element_t rnd_source; #endif }; int fdprobe __P((struct device *, struct cfdata *, void *)); void fdattach __P((struct device *, struct device *, void *)); extern struct cfdriver fd_cd; struct cfattach fd_ca = { sizeof(struct fd_softc), fdprobe, fdattach, }; void fdgetdisklabel __P((struct fd_softc *)); int fd_get_parms __P((struct fd_softc *)); void fdstrategy __P((struct buf *)); void fdstart __P((struct fd_softc *)); struct dkdriver fddkdriver = { fdstrategy }; #if defined(i386) const struct fd_type *fd_nvtotype __P((char *, int, int)); #endif /* i386 */ void fd_set_motor __P((struct fdc_softc *fdc, int reset)); void fd_motor_off __P((void *arg)); void fd_motor_on __P((void *arg)); int fdcresult __P((struct fdc_softc *fdc)); void fdcstart __P((struct fdc_softc *fdc)); void fdcstatus __P((struct device *dv, int n, char *s)); void fdctimeout __P((void *arg)); void fdcpseudointr __P((void *arg)); void fdcretry __P((struct fdc_softc *fdc)); void fdfinish __P((struct fd_softc *fd, struct buf *bp)); __inline const struct fd_type *fd_dev_to_type __P((struct fd_softc *, dev_t)); int fdformat __P((dev_t, struct ne7_fd_formb *, struct proc *)); void fd_mountroot_hook __P((struct device *)); /* * Arguments passed between fdcattach and fdprobe. */ struct fdc_attach_args { int fa_drive; const struct fd_type *fa_deftype; }; /* * Print the location of a disk drive (called just before attaching the * the drive). If `fdc' is not NULL, the drive was found but was not * in the system config file; print the drive name as well. * Return QUIET (config_find ignores this if the device was configured) to * avoid printing `fdN not configured' messages. */ int fdprint(aux, fdc) void *aux; const char *fdc; { register struct fdc_attach_args *fa = aux; if (!fdc) printf(" drive %d", fa->fa_drive); return QUIET; } void fdcattach(fdc) struct fdc_softc *fdc; { struct fdc_attach_args fa; bus_space_tag_t iot; bus_space_handle_t ioh; #if defined(i386) int type; #endif iot = fdc->sc_iot; ioh = fdc->sc_ioh; callout_init(&fdc->sc_timo_ch); callout_init(&fdc->sc_intr_ch); fdc->sc_state = DEVIDLE; TAILQ_INIT(&fdc->sc_drives); fdc->sc_maxiosize = isa_dmamaxsize(fdc->sc_ic, fdc->sc_drq); if (isa_dmamap_create(fdc->sc_ic, fdc->sc_drq, fdc->sc_maxiosize, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW)) { printf("%s: can't set up ISA DMA map\n", fdc->sc_dev.dv_xname); return; } /* * Reset the controller to get it into a known state. Not all * probes necessarily need do this to discover the controller up * front, so don't assume anything. */ bus_space_write_1(iot, ioh, fdout, 0); delay(100); bus_space_write_1(iot, ioh, fdout, FDO_FRST); /* see if it can handle a command */ if (out_fdc(iot, ioh, NE7CMD_SPECIFY) < 0) { printf ("%s: can't reset controller\n", fdc->sc_dev.dv_xname); return; } out_fdc(iot, ioh, 0xdf); out_fdc(iot, ioh, 2); #if defined(i386) /* * The NVRAM info only tells us about the first two disks on the * `primary' floppy controller. */ if (fdc->sc_dev.dv_unit == 0) type = mc146818_read(NULL, NVRAM_DISKETTE); /* XXX softc */ else type = -1; #endif /* i386 */ /* physical limit: four drives per controller. */ for (fa.fa_drive = 0; fa.fa_drive < 4; fa.fa_drive++) { #if defined(i386) if (type >= 0 && fa.fa_drive < 2) fa.fa_deftype = fd_nvtotype(fdc->sc_dev.dv_xname, type, fa.fa_drive); else fa.fa_deftype = NULL; /* unknown */ #elif defined(atari) /* * Atari has a different ordening, defaults to 1.44 */ fa.fa_deftype = &fd_types[2]; #else /* * Default to 1.44MB on Alpha and BeBox. How do we tell * on these platforms? */ fa.fa_deftype = &fd_types[0]; #endif /* i386 */ (void)config_found(&fdc->sc_dev, (void *)&fa, fdprint); } } int fdprobe(parent, match, aux) struct device *parent; struct cfdata *match; void *aux; { struct fdc_softc *fdc = (void *)parent; struct cfdata *cf = match; struct fdc_attach_args *fa = aux; int drive = fa->fa_drive; bus_space_tag_t iot = fdc->sc_iot; bus_space_handle_t ioh = fdc->sc_ioh; int n; if (cf->cf_loc[FDCCF_DRIVE] != FDCCF_DRIVE_DEFAULT && cf->cf_loc[FDCCF_DRIVE] != drive) return 0; /* * XXX * This is to work around some odd interactions between this driver * and SMC Ethernet cards. */ if (cf->cf_loc[FDCCF_DRIVE] == FDCCF_DRIVE_DEFAULT && drive >= 2) return 0; /* select drive and turn on motor */ bus_space_write_1(iot, ioh, fdout, drive | FDO_FRST | FDO_MOEN(drive)); /* wait for motor to spin up */ delay(250000); out_fdc(iot, ioh, NE7CMD_RECAL); out_fdc(iot, ioh, drive); /* wait for recalibrate */ delay(2000000); out_fdc(iot, ioh, NE7CMD_SENSEI); n = fdcresult(fdc); #ifdef FD_DEBUG { int i; printf("fdprobe: status"); for (i = 0; i < n; i++) printf(" %x", fdc->sc_status[i]); printf("\n"); } #endif /* turn off motor */ bus_space_write_1(iot, ioh, fdout, FDO_FRST); #if defined(bebox) /* XXX What is this about? --thorpej@netbsd.org */ if (n != 2 || (fdc->sc_status[1] != 0)) return 0; #else if (n != 2 || (fdc->sc_status[0] & 0xf8) != 0x20) return 0; #endif /* bebox */ return 1; } /* * Controller is working, and drive responded. Attach it. */ void fdattach(parent, self, aux) struct device *parent, *self; void *aux; { struct fdc_softc *fdc = (void *)parent; struct fd_softc *fd = (void *)self; struct fdc_attach_args *fa = aux; const struct fd_type *type = fa->fa_deftype; int drive = fa->fa_drive; callout_init(&fd->sc_motoron_ch); callout_init(&fd->sc_motoroff_ch); /* XXX Allow `flags' to override device type? */ if (type) printf(": %s, %d cyl, %d head, %d sec\n", type->name, type->cyls, type->heads, type->sectrac); else printf(": density unknown\n"); BUFQ_INIT(&fd->sc_q); fd->sc_cylin = -1; fd->sc_drive = drive; fd->sc_deftype = type; fdc->sc_fd[drive] = fd; /* * Initialize and attach the disk structure. */ fd->sc_dk.dk_name = fd->sc_dev.dv_xname; fd->sc_dk.dk_driver = &fddkdriver; disk_attach(&fd->sc_dk); /* * Establish a mountroot hook. */ mountroothook_establish(fd_mountroot_hook, &fd->sc_dev); /* Needed to power off if the motor is on when we halt. */ fd->sc_sdhook = shutdownhook_establish(fd_motor_off, fd); #if NRND > 0 rnd_attach_source(&fd->rnd_source, fd->sc_dev.dv_xname, RND_TYPE_DISK, 0); #endif } #if defined(i386) /* * Translate nvram type into internal data structure. Return NULL for * none/unknown/unusable. */ const struct fd_type * fd_nvtotype(fdc, nvraminfo, drive) char *fdc; int nvraminfo, drive; { int type; type = (drive == 0 ? nvraminfo : nvraminfo << 4) & 0xf0; switch (type) { case NVRAM_DISKETTE_NONE: return NULL; case NVRAM_DISKETTE_12M: return &fd_types[1]; case NVRAM_DISKETTE_TYPE5: case NVRAM_DISKETTE_TYPE6: /* XXX We really ought to handle 2.88MB format. */ case NVRAM_DISKETTE_144M: #if NMCA > 0 if (MCA_system) return &mca_fd_types[0]; else #endif /* NMCA > 0 */ return &fd_types[0]; case NVRAM_DISKETTE_360K: return &fd_types[3]; case NVRAM_DISKETTE_720K: #if NMCA > 0 if (MCA_system) return &mca_fd_types[1]; else #endif /* NMCA > 0 */ return &fd_types[4]; default: printf("%s: drive %d: unknown device type 0x%x\n", fdc, drive, type); return NULL; } } #endif /* i386 */ __inline const struct fd_type * fd_dev_to_type(fd, dev) struct fd_softc *fd; dev_t dev; { int type = FDTYPE(dev); if (type > (sizeof(fd_types) / sizeof(fd_types[0]))) return NULL; return type ? &fd_types[type - 1] : fd->sc_deftype; } void fdstrategy(bp) register struct buf *bp; /* IO operation to perform */ { struct fd_softc *fd = device_lookup(&fd_cd, FDUNIT(bp->b_dev)); int sz; int s; /* Valid unit, controller, and request? */ if (bp->b_blkno < 0 || ((bp->b_bcount % FDC_BSIZE) != 0 && (bp->b_flags & B_FORMAT) == 0)) { bp->b_error = EINVAL; goto bad; } /* If it's a null transfer, return immediately. */ if (bp->b_bcount == 0) goto done; sz = howmany(bp->b_bcount, FDC_BSIZE); if (bp->b_blkno + sz > fd->sc_type->size) { sz = fd->sc_type->size - bp->b_blkno; if (sz == 0) { /* If exactly at end of disk, return EOF. */ goto done; } if (sz < 0) { /* If past end of disk, return EINVAL. */ bp->b_error = EINVAL; goto bad; } /* Otherwise, truncate request. */ bp->b_bcount = sz << DEV_BSHIFT; } bp->b_rawblkno = bp->b_blkno; bp->b_cylinder = bp->b_blkno / (FDC_BSIZE / DEV_BSIZE) / fd->sc_type->seccyl; #ifdef FD_DEBUG printf("fdstrategy: b_blkno %d b_bcount %ld blkno %d cylin %ld sz %d\n", bp->b_blkno, bp->b_bcount, fd->sc_blkno, bp->b_cylinder, sz); #endif /* Queue transfer on drive, activate drive and controller if idle. */ s = splbio(); disksort_cylinder(&fd->sc_q, bp); callout_stop(&fd->sc_motoroff_ch); /* a good idea */ if (fd->sc_active == 0) fdstart(fd); #ifdef DIAGNOSTIC else { struct fdc_softc *fdc = (void *)fd->sc_dev.dv_parent; if (fdc->sc_state == DEVIDLE) { printf("fdstrategy: controller inactive\n"); fdcstart(fdc); } } #endif splx(s); return; bad: bp->b_flags |= B_ERROR; done: /* Toss transfer; we're done early. */ bp->b_resid = bp->b_bcount; biodone(bp); } void fdstart(fd) struct fd_softc *fd; { struct fdc_softc *fdc = (void *)fd->sc_dev.dv_parent; int active = fdc->sc_drives.tqh_first != 0; /* Link into controller queue. */ fd->sc_active = 1; TAILQ_INSERT_TAIL(&fdc->sc_drives, fd, sc_drivechain); /* If controller not already active, start it. */ if (!active) fdcstart(fdc); } void fdfinish(fd, bp) struct fd_softc *fd; struct buf *bp; { struct fdc_softc *fdc = (void *)fd->sc_dev.dv_parent; /* * Move this drive to the end of the queue to give others a `fair' * chance. We only force a switch if N operations are completed while * another drive is waiting to be serviced, since there is a long motor * startup delay whenever we switch. */ if (fd->sc_drivechain.tqe_next && ++fd->sc_ops >= 8) { fd->sc_ops = 0; TAILQ_REMOVE(&fdc->sc_drives, fd, sc_drivechain); if (BUFQ_NEXT(bp) != NULL) TAILQ_INSERT_TAIL(&fdc->sc_drives, fd, sc_drivechain); else fd->sc_active = 0; } bp->b_resid = fd->sc_bcount; fd->sc_skip = 0; BUFQ_REMOVE(&fd->sc_q, bp); #if NRND > 0 rnd_add_uint32(&fd->rnd_source, bp->b_blkno); #endif biodone(bp); /* turn off motor 5s from now */ callout_reset(&fd->sc_motoroff_ch, 5 * hz, fd_motor_off, fd); fdc->sc_state = DEVIDLE; } int fdread(dev, uio, flags) dev_t dev; struct uio *uio; int flags; { return (physio(fdstrategy, NULL, dev, B_READ, minphys, uio)); } int fdwrite(dev, uio, flags) dev_t dev; struct uio *uio; int flags; { return (physio(fdstrategy, NULL, dev, B_WRITE, minphys, uio)); } void fd_set_motor(fdc, reset) struct fdc_softc *fdc; int reset; { struct fd_softc *fd; u_char status; int n; if ((fd = fdc->sc_drives.tqh_first) != NULL) status = fd->sc_drive; else status = 0; if (!reset) status |= FDO_FRST | FDO_FDMAEN; for (n = 0; n < 4; n++) if ((fd = fdc->sc_fd[n]) && (fd->sc_flags & FD_MOTOR)) status |= FDO_MOEN(n); bus_space_write_1(fdc->sc_iot, fdc->sc_ioh, fdout, status); } void fd_motor_off(arg) void *arg; { struct fd_softc *fd = arg; int s; s = splbio(); fd->sc_flags &= ~(FD_MOTOR | FD_MOTOR_WAIT); fd_set_motor((struct fdc_softc *)fd->sc_dev.dv_parent, 0); splx(s); } void fd_motor_on(arg) void *arg; { struct fd_softc *fd = arg; struct fdc_softc *fdc = (void *)fd->sc_dev.dv_parent; int s; s = splbio(); fd->sc_flags &= ~FD_MOTOR_WAIT; if ((fdc->sc_drives.tqh_first == fd) && (fdc->sc_state == MOTORWAIT)) (void) fdcintr(fdc); splx(s); } int fdcresult(fdc) struct fdc_softc *fdc; { bus_space_tag_t iot = fdc->sc_iot; bus_space_handle_t ioh = fdc->sc_ioh; u_char i; int j = 100000, n = 0; for (; j; j--) { i = bus_space_read_1(iot, ioh, fdsts) & (NE7_DIO | NE7_RQM | NE7_CB); if (i == NE7_RQM) return n; if (i == (NE7_DIO | NE7_RQM | NE7_CB)) { if (n >= sizeof(fdc->sc_status)) { log(LOG_ERR, "fdcresult: overrun\n"); return -1; } fdc->sc_status[n++] = bus_space_read_1(iot, ioh, fddata); } delay(10); } log(LOG_ERR, "fdcresult: timeout\n"); return -1; } int out_fdc(iot, ioh, x) bus_space_tag_t iot; bus_space_handle_t ioh; u_char x; { int i = 100000; while ((bus_space_read_1(iot, ioh, fdsts) & NE7_DIO) && i-- > 0); if (i <= 0) return -1; while ((bus_space_read_1(iot, ioh, fdsts) & NE7_RQM) == 0 && i-- > 0); if (i <= 0) return -1; bus_space_write_1(iot, ioh, fddata, x); return 0; } int fdopen(dev, flags, mode, p) dev_t dev; int flags; int mode; struct proc *p; { struct fd_softc *fd; const struct fd_type *type; fd = device_lookup(&fd_cd, FDUNIT(dev)); if (fd == NULL) return (ENXIO); type = fd_dev_to_type(fd, dev); if (type == NULL) return ENXIO; if ((fd->sc_flags & FD_OPEN) != 0 && memcmp(fd->sc_type, type, sizeof(*type))) return EBUSY; fd->sc_type_copy = *type; fd->sc_type = &fd->sc_type_copy; fd->sc_cylin = -1; fd->sc_flags |= FD_OPEN; return 0; } int fdclose(dev, flags, mode, p) dev_t dev; int flags; int mode; struct proc *p; { struct fd_softc *fd = device_lookup(&fd_cd, FDUNIT(dev)); fd->sc_flags &= ~FD_OPEN; fd->sc_opts &= ~(FDOPT_NORETRY|FDOPT_SILENT); return 0; } void fdcstart(fdc) struct fdc_softc *fdc; { #ifdef DIAGNOSTIC /* only got here if controller's drive queue was inactive; should be in idle state */ if (fdc->sc_state != DEVIDLE) { printf("fdcstart: not idle\n"); return; } #endif (void) fdcintr(fdc); } void fdcstatus(dv, n, s) struct device *dv; int n; char *s; { struct fdc_softc *fdc = (void *)dv->dv_parent; char bits[64]; if (n == 0) { out_fdc(fdc->sc_iot, fdc->sc_ioh, NE7CMD_SENSEI); (void) fdcresult(fdc); n = 2; } printf("%s: %s", dv->dv_xname, s); switch (n) { case 0: printf("\n"); break; case 2: printf(" (st0 %s cyl %d)\n", bitmask_snprintf(fdc->sc_status[0], NE7_ST0BITS, bits, sizeof(bits)), fdc->sc_status[1]); break; case 7: printf(" (st0 %s", bitmask_snprintf(fdc->sc_status[0], NE7_ST0BITS, bits, sizeof(bits))); printf(" st1 %s", bitmask_snprintf(fdc->sc_status[1], NE7_ST1BITS, bits, sizeof(bits))); printf(" st2 %s", bitmask_snprintf(fdc->sc_status[2], NE7_ST2BITS, bits, sizeof(bits))); printf(" cyl %d head %d sec %d)\n", fdc->sc_status[3], fdc->sc_status[4], fdc->sc_status[5]); break; #ifdef DIAGNOSTIC default: printf("\nfdcstatus: weird size"); break; #endif } } void fdctimeout(arg) void *arg; { struct fdc_softc *fdc = arg; struct fd_softc *fd = fdc->sc_drives.tqh_first; int s; s = splbio(); #ifdef DEBUG log(LOG_ERR, "fdctimeout: state %d\n", fdc->sc_state); #endif fdcstatus(&fd->sc_dev, 0, "timeout"); if (BUFQ_FIRST(&fd->sc_q) != NULL) fdc->sc_state++; else fdc->sc_state = DEVIDLE; (void) fdcintr(fdc); splx(s); } void fdcpseudointr(arg) void *arg; { int s; /* Just ensure it has the right spl. */ s = splbio(); (void) fdcintr(arg); splx(s); } int fdcintr(arg) void *arg; { struct fdc_softc *fdc = arg; #define st0 fdc->sc_status[0] #define cyl fdc->sc_status[1] struct fd_softc *fd; struct buf *bp; bus_space_tag_t iot = fdc->sc_iot; bus_space_handle_t ioh = fdc->sc_ioh; int read, head, sec, i, nblks; struct fd_type *type; struct ne7_fd_formb *finfo = NULL; loop: /* Is there a drive for the controller to do a transfer with? */ fd = fdc->sc_drives.tqh_first; if (fd == NULL) { fdc->sc_state = DEVIDLE; return 1; } /* Is there a transfer to this drive? If not, deactivate drive. */ bp = BUFQ_FIRST(&fd->sc_q); if (bp == NULL) { fd->sc_ops = 0; TAILQ_REMOVE(&fdc->sc_drives, fd, sc_drivechain); fd->sc_active = 0; goto loop; } if (bp->b_flags & B_FORMAT) finfo = (struct ne7_fd_formb *)bp->b_data; switch (fdc->sc_state) { case DEVIDLE: fdc->sc_errors = 0; fd->sc_skip = 0; fd->sc_bcount = bp->b_bcount; fd->sc_blkno = bp->b_blkno / (FDC_BSIZE / DEV_BSIZE); callout_stop(&fd->sc_motoroff_ch); if ((fd->sc_flags & FD_MOTOR_WAIT) != 0) { fdc->sc_state = MOTORWAIT; return 1; } if ((fd->sc_flags & FD_MOTOR) == 0) { /* Turn on the motor, being careful about pairing. */ struct fd_softc *ofd = fdc->sc_fd[fd->sc_drive ^ 1]; if (ofd && ofd->sc_flags & FD_MOTOR) { callout_stop(&ofd->sc_motoroff_ch); ofd->sc_flags &= ~(FD_MOTOR | FD_MOTOR_WAIT); } fd->sc_flags |= FD_MOTOR | FD_MOTOR_WAIT; fd_set_motor(fdc, 0); fdc->sc_state = MOTORWAIT; /* Allow .25s for motor to stabilize. */ callout_reset(&fd->sc_motoron_ch, hz / 4, fd_motor_on, fd); return 1; } /* Make sure the right drive is selected. */ fd_set_motor(fdc, 0); /* fall through */ case DOSEEK: doseek: if (fd->sc_cylin == bp->b_cylinder) goto doio; out_fdc(iot, ioh, NE7CMD_SPECIFY);/* specify command */ out_fdc(iot, ioh, fd->sc_type->steprate); out_fdc(iot, ioh, 6); /* XXX head load time == 6ms */ out_fdc(iot, ioh, NE7CMD_SEEK); /* seek function */ out_fdc(iot, ioh, fd->sc_drive); /* drive number */ out_fdc(iot, ioh, bp->b_cylinder * fd->sc_type->step); fd->sc_cylin = -1; fdc->sc_state = SEEKWAIT; fd->sc_dk.dk_seek++; disk_busy(&fd->sc_dk); callout_reset(&fdc->sc_timo_ch, 4 * hz, fdctimeout, fdc); return 1; case DOIO: doio: type = fd->sc_type; if (finfo) fd->sc_skip = (char *)&(finfo->fd_formb_cylno(0)) - (char *)finfo; sec = fd->sc_blkno % type->seccyl; nblks = type->seccyl - sec; nblks = min(nblks, fd->sc_bcount / FDC_BSIZE); nblks = min(nblks, fdc->sc_maxiosize / FDC_BSIZE); fd->sc_nblks = nblks; fd->sc_nbytes = finfo ? bp->b_bcount : nblks * FDC_BSIZE; head = sec / type->sectrac; sec -= head * type->sectrac; #ifdef DIAGNOSTIC { int block; block = (fd->sc_cylin * type->heads + head) * type->sectrac + sec; if (block != fd->sc_blkno) { printf("fdcintr: block %d != blkno %d\n", block, fd->sc_blkno); #ifdef DDB Debugger(); #endif } } #endif read = bp->b_flags & B_READ ? DMAMODE_READ : DMAMODE_WRITE; isa_dmastart(fdc->sc_ic, fdc->sc_drq, bp->b_data + fd->sc_skip, fd->sc_nbytes, NULL, read | DMAMODE_DEMAND, BUS_DMA_NOWAIT); bus_space_write_1(iot, fdc->sc_fdctlioh, 0, type->rate); #ifdef FD_DEBUG printf("fdcintr: %s drive %d track %d head %d sec %d nblks %d\n", read ? "read" : "write", fd->sc_drive, fd->sc_cylin, head, sec, nblks); #endif if (finfo) { /* formatting */ if (out_fdc(iot, ioh, NE7CMD_FORMAT) < 0) { fdc->sc_errors = 4; fdcretry(fdc); goto loop; } out_fdc(iot, ioh, (head << 2) | fd->sc_drive); out_fdc(iot, ioh, finfo->fd_formb_secshift); out_fdc(iot, ioh, finfo->fd_formb_nsecs); out_fdc(iot, ioh, finfo->fd_formb_gaplen); out_fdc(iot, ioh, finfo->fd_formb_fillbyte); } else { if (read) out_fdc(iot, ioh, NE7CMD_READ); /* READ */ else out_fdc(iot, ioh, NE7CMD_WRITE); /* WRITE */ out_fdc(iot, ioh, (head << 2) | fd->sc_drive); out_fdc(iot, ioh, fd->sc_cylin); /* track */ out_fdc(iot, ioh, head); out_fdc(iot, ioh, sec + 1); /* sector +1 */ out_fdc(iot, ioh, type->secsize);/* sector size */ out_fdc(iot, ioh, type->sectrac);/* sectors/track */ out_fdc(iot, ioh, type->gap1); /* gap1 size */ out_fdc(iot, ioh, type->datalen);/* data length */ } fdc->sc_state = IOCOMPLETE; disk_busy(&fd->sc_dk); /* allow 2 seconds for operation */ callout_reset(&fdc->sc_timo_ch, 2 * hz, fdctimeout, fdc); return 1; /* will return later */ case SEEKWAIT: callout_stop(&fdc->sc_timo_ch); fdc->sc_state = SEEKCOMPLETE; /* allow 1/50 second for heads to settle */ callout_reset(&fdc->sc_intr_ch, hz / 50, fdcpseudointr, fdc); return 1; case SEEKCOMPLETE: disk_unbusy(&fd->sc_dk, 0); /* no data on seek */ /* Make sure seek really happened. */ out_fdc(iot, ioh, NE7CMD_SENSEI); if (fdcresult(fdc) != 2 || (st0 & 0xf8) != 0x20 || cyl != bp->b_cylinder * fd->sc_type->step) { #ifdef FD_DEBUG fdcstatus(&fd->sc_dev, 2, "seek failed"); #endif fdcretry(fdc); goto loop; } fd->sc_cylin = bp->b_cylinder; goto doio; case IOTIMEDOUT: isa_dmaabort(fdc->sc_ic, fdc->sc_drq); case SEEKTIMEDOUT: case RECALTIMEDOUT: case RESETTIMEDOUT: fdcretry(fdc); goto loop; case IOCOMPLETE: /* IO DONE, post-analyze */ callout_stop(&fdc->sc_timo_ch); disk_unbusy(&fd->sc_dk, (bp->b_bcount - bp->b_resid)); if (fdcresult(fdc) != 7 || (st0 & 0xf8) != 0) { isa_dmaabort(fdc->sc_ic, fdc->sc_drq); #ifdef FD_DEBUG fdcstatus(&fd->sc_dev, 7, bp->b_flags & B_READ ? "read failed" : "write failed"); printf("blkno %d nblks %d\n", fd->sc_blkno, fd->sc_nblks); #endif fdcretry(fdc); goto loop; } isa_dmadone(fdc->sc_ic, fdc->sc_drq); if (fdc->sc_errors) { diskerr(bp, "fd", "soft error (corrected)", LOG_PRINTF, fd->sc_skip / FDC_BSIZE, (struct disklabel *)NULL); printf("\n"); fdc->sc_errors = 0; } fd->sc_blkno += fd->sc_nblks; fd->sc_skip += fd->sc_nbytes; fd->sc_bcount -= fd->sc_nbytes; if (!finfo && fd->sc_bcount > 0) { bp->b_cylinder = fd->sc_blkno / fd->sc_type->seccyl; goto doseek; } fdfinish(fd, bp); goto loop; case DORESET: /* try a reset, keep motor on */ fd_set_motor(fdc, 1); delay(100); fd_set_motor(fdc, 0); fdc->sc_state = RESETCOMPLETE; callout_reset(&fdc->sc_timo_ch, hz / 2, fdctimeout, fdc); return 1; /* will return later */ case RESETCOMPLETE: callout_stop(&fdc->sc_timo_ch); /* clear the controller output buffer */ for (i = 0; i < 4; i++) { out_fdc(iot, ioh, NE7CMD_SENSEI); (void) fdcresult(fdc); } /* fall through */ case DORECAL: out_fdc(iot, ioh, NE7CMD_RECAL); /* recalibrate function */ out_fdc(iot, ioh, fd->sc_drive); fdc->sc_state = RECALWAIT; callout_reset(&fdc->sc_timo_ch, 5 * hz, fdctimeout, fdc); return 1; /* will return later */ case RECALWAIT: callout_stop(&fdc->sc_timo_ch); fdc->sc_state = RECALCOMPLETE; /* allow 1/30 second for heads to settle */ callout_reset(&fdc->sc_intr_ch, hz / 30, fdcpseudointr, fdc); return 1; /* will return later */ case RECALCOMPLETE: out_fdc(iot, ioh, NE7CMD_SENSEI); if (fdcresult(fdc) != 2 || (st0 & 0xf8) != 0x20 || cyl != 0) { #ifdef FD_DEBUG fdcstatus(&fd->sc_dev, 2, "recalibrate failed"); #endif fdcretry(fdc); goto loop; } fd->sc_cylin = 0; goto doseek; case MOTORWAIT: if (fd->sc_flags & FD_MOTOR_WAIT) return 1; /* time's not up yet */ goto doseek; default: fdcstatus(&fd->sc_dev, 0, "stray interrupt"); return 1; } #ifdef DIAGNOSTIC panic("fdcintr: impossible"); #endif #undef st0 #undef cyl } void fdcretry(fdc) struct fdc_softc *fdc; { char bits[64]; struct fd_softc *fd; struct buf *bp; fd = fdc->sc_drives.tqh_first; bp = BUFQ_FIRST(&fd->sc_q); if (fd->sc_opts & FDOPT_NORETRY) goto fail; switch (fdc->sc_errors) { case 0: /* try again */ fdc->sc_state = DOSEEK; break; case 1: case 2: case 3: /* didn't work; try recalibrating */ fdc->sc_state = DORECAL; break; case 4: /* still no go; reset the bastard */ fdc->sc_state = DORESET; break; default: fail: if ((fd->sc_opts & FDOPT_SILENT) == 0) { diskerr(bp, "fd", "hard error", LOG_PRINTF, fd->sc_skip / FDC_BSIZE, (struct disklabel *)NULL); printf(" (st0 %s", bitmask_snprintf(fdc->sc_status[0], NE7_ST0BITS, bits, sizeof(bits))); printf(" st1 %s", bitmask_snprintf(fdc->sc_status[1], NE7_ST1BITS, bits, sizeof(bits))); printf(" st2 %s", bitmask_snprintf(fdc->sc_status[2], NE7_ST2BITS, bits, sizeof(bits))); printf(" cyl %d head %d sec %d)\n", fdc->sc_status[3], fdc->sc_status[4], fdc->sc_status[5]); } bp->b_flags |= B_ERROR; bp->b_error = EIO; fdfinish(fd, bp); } fdc->sc_errors++; } int fdsize(dev) dev_t dev; { /* Swapping to floppies would not make sense. */ return -1; } int fddump(dev, blkno, va, size) dev_t dev; daddr_t blkno; caddr_t va; size_t size; { /* Not implemented. */ return ENXIO; } int fdioctl(dev, cmd, addr, flag, p) dev_t dev; u_long cmd; caddr_t addr; int flag; struct proc *p; { struct fd_softc *fd = device_lookup(&fd_cd, FDUNIT(dev)); struct fdformat_parms *form_parms; struct fdformat_cmd *form_cmd; struct ne7_fd_formb *fd_formb; struct disklabel buffer; int error; unsigned int scratch; int il[FD_MAX_NSEC + 1]; register int i, j; #ifdef __HAVE_OLD_DISKLABEL struct disklabel newlabel; #endif switch (cmd) { case DIOCGDINFO: #ifdef __HAVE_OLD_DISKLABEL case ODIOCGDINFO: #endif memset(&buffer, 0, sizeof(buffer)); buffer.d_secpercyl = fd->sc_type->seccyl; buffer.d_type = DTYPE_FLOPPY; buffer.d_secsize = FDC_BSIZE; if (readdisklabel(dev, fdstrategy, &buffer, NULL) != NULL) return EINVAL; #ifdef __HAVE_OLD_DISKLABEL if (cmd == ODIOCGDINFO) { if (buffer.d_npartitions > OLDMAXPARTITIONS) return ENOTTY; memcpy(addr, &buffer, sizeof (struct olddisklabel)); } else #endif *(struct disklabel *)addr = buffer; return 0; case DIOCWLABEL: if ((flag & FWRITE) == 0) return EBADF; /* XXX do something */ return 0; case DIOCWDINFO: #ifdef __HAVE_OLD_DISKLABEL case ODIOCWDINFO: #endif { struct disklabel *lp; if ((flag & FWRITE) == 0) return EBADF; #ifdef __HAVE_OLD_DISKLABEL if (cmd == ODIOCWDINFO) { memset(&newlabel, 0, sizeof newlabel); memcpy(&newlabel, addr, sizeof (struct olddisklabel)); lp = &newlabel; } else #endif lp = (struct disklabel *)addr; error = setdisklabel(&buffer, lp, 0, NULL); if (error) return error; error = writedisklabel(dev, fdstrategy, &buffer, NULL); return error; } case FDIOCGETFORMAT: form_parms = (struct fdformat_parms *)addr; form_parms->fdformat_version = FDFORMAT_VERSION; form_parms->nbps = 128 * (1 << fd->sc_type->secsize); form_parms->ncyl = fd->sc_type->cyls; form_parms->nspt = fd->sc_type->sectrac; form_parms->ntrk = fd->sc_type->heads; form_parms->stepspercyl = fd->sc_type->step; form_parms->gaplen = fd->sc_type->gap2; form_parms->fillbyte = fd->sc_type->fillbyte; form_parms->interleave = fd->sc_type->interleave; switch (fd->sc_type->rate) { case FDC_500KBPS: form_parms->xfer_rate = 500 * 1024; break; case FDC_300KBPS: form_parms->xfer_rate = 300 * 1024; break; case FDC_250KBPS: form_parms->xfer_rate = 250 * 1024; break; default: return EINVAL; } return 0; case FDIOCSETFORMAT: if((flag & FWRITE) == 0) return EBADF; /* must be opened for writing */ form_parms = (struct fdformat_parms *)addr; if (form_parms->fdformat_version != FDFORMAT_VERSION) return EINVAL; /* wrong version of formatting prog */ scratch = form_parms->nbps >> 7; if ((form_parms->nbps & 0x7f) || ffs(scratch) == 0 || scratch & ~(1 << (ffs(scratch)-1))) /* not a power-of-two multiple of 128 */ return EINVAL; switch (form_parms->xfer_rate) { case 500 * 1024: fd->sc_type->rate = FDC_500KBPS; break; case 300 * 1024: fd->sc_type->rate = FDC_300KBPS; break; case 250 * 1024: fd->sc_type->rate = FDC_250KBPS; break; default: return EINVAL; } if (form_parms->nspt > FD_MAX_NSEC || form_parms->fillbyte > 0xff || form_parms->interleave > 0xff) return EINVAL; fd->sc_type->sectrac = form_parms->nspt; if (form_parms->ntrk != 2 && form_parms->ntrk != 1) return EINVAL; fd->sc_type->heads = form_parms->ntrk; fd->sc_type->seccyl = form_parms->nspt * form_parms->ntrk; fd->sc_type->secsize = ffs(scratch)-1; fd->sc_type->gap2 = form_parms->gaplen; fd->sc_type->cyls = form_parms->ncyl; fd->sc_type->size = fd->sc_type->seccyl * form_parms->ncyl * form_parms->nbps / DEV_BSIZE; fd->sc_type->step = form_parms->stepspercyl; fd->sc_type->fillbyte = form_parms->fillbyte; fd->sc_type->interleave = form_parms->interleave; return 0; case FDIOCFORMAT_TRACK: if((flag & FWRITE) == 0) return EBADF; /* must be opened for writing */ form_cmd = (struct fdformat_cmd *)addr; if (form_cmd->formatcmd_version != FDFORMAT_VERSION) return EINVAL; /* wrong version of formatting prog */ if (form_cmd->head >= fd->sc_type->heads || form_cmd->cylinder >= fd->sc_type->cyls) { return EINVAL; } fd_formb = malloc(sizeof(struct ne7_fd_formb), M_TEMP, M_NOWAIT); if (fd_formb == 0) return ENOMEM; fd_formb->head = form_cmd->head; fd_formb->cyl = form_cmd->cylinder; fd_formb->transfer_rate = fd->sc_type->rate; fd_formb->fd_formb_secshift = fd->sc_type->secsize; fd_formb->fd_formb_nsecs = fd->sc_type->sectrac; fd_formb->fd_formb_gaplen = fd->sc_type->gap2; fd_formb->fd_formb_fillbyte = fd->sc_type->fillbyte; memset(il, 0, sizeof il); for (j = 0, i = 1; i <= fd_formb->fd_formb_nsecs; i++) { while (il[(j%fd_formb->fd_formb_nsecs)+1]) j++; il[(j%fd_formb->fd_formb_nsecs)+1] = i; j += fd->sc_type->interleave; } for (i = 0; i < fd_formb->fd_formb_nsecs; i++) { fd_formb->fd_formb_cylno(i) = form_cmd->cylinder; fd_formb->fd_formb_headno(i) = form_cmd->head; fd_formb->fd_formb_secno(i) = il[i+1]; fd_formb->fd_formb_secsize(i) = fd->sc_type->secsize; } error = fdformat(dev, fd_formb, p); free(fd_formb, M_TEMP); return error; case FDIOCGETOPTS: /* get drive options */ *(int *)addr = fd->sc_opts; return 0; case FDIOCSETOPTS: /* set drive options */ fd->sc_opts = *(int *)addr; return 0; default: return ENOTTY; } #ifdef DIAGNOSTIC panic("fdioctl: impossible"); #endif } int fdformat(dev, finfo, p) dev_t dev; struct ne7_fd_formb *finfo; struct proc *p; { int rv = 0, s; struct fd_softc *fd = device_lookup(&fd_cd, FDUNIT(dev)); struct fd_type *type = fd->sc_type; struct buf *bp; /* set up a buffer header for fdstrategy() */ bp = (struct buf *)malloc(sizeof(struct buf), M_TEMP, M_NOWAIT); if(bp == 0) return ENOBUFS; memset((void *)bp, 0, sizeof(struct buf)); bp->b_flags = B_BUSY | B_PHYS | B_FORMAT; bp->b_proc = p; bp->b_dev = dev; /* * calculate a fake blkno, so fdstrategy() would initiate a * seek to the requested cylinder */ bp->b_blkno = (finfo->cyl * (type->sectrac * type->heads) + finfo->head * type->sectrac) * FDC_BSIZE / DEV_BSIZE; bp->b_bcount = sizeof(struct fd_idfield_data) * finfo->fd_formb_nsecs; bp->b_data = (caddr_t)finfo; #ifdef DEBUG printf("fdformat: blkno %x count %lx\n", bp->b_blkno, bp->b_bcount); #endif /* now do the format */ fdstrategy(bp); /* ...and wait for it to complete */ s = splbio(); while (!(bp->b_flags & B_DONE)) { rv = tsleep((caddr_t)bp, PRIBIO, "fdform", 20 * hz); if (rv == EWOULDBLOCK) break; } splx(s); if (rv == EWOULDBLOCK) { /* timed out */ rv = EIO; biodone(bp); } if(bp->b_flags & B_ERROR) { rv = bp->b_error; } free(bp, M_TEMP); return rv; } /* * Mountroot hook: prompt the user to enter the root file system * floppy. */ void fd_mountroot_hook(dev) struct device *dev; { int c; printf("Insert filesystem floppy and press return."); cnpollc(1); for (;;) { c = cngetc(); if ((c == '\r') || (c == '\n')) { printf("\n"); break; } } cnpollc(0); }