1991/0924/pc/devfloppy.c (diff list | history)

1991/0921/sys/src/9/pc/devfloppy.c:6,41 – 1991/0924/sys/src/9/pc/devfloppy.c:6,47 (short | long | prev | next)
1991/0727		#include "io.h"
1991/0802		#include "errno.h"
1991/0727
1991/0920		/* NEC PD765A (8272A compatible) floppy controller */
1991/0924		/* Intel 82077A (8272A compatible) floppy controller */
1991/0920
1991/0802		typedef struct Drive Drive;
1991/0727		typedef struct Controller Controller;
1991/0802		typedef struct Type Type;
1991/0727
1991/0924		/* bits in the registers */
1991/0727		enum { Fmotor= 0x3f2, /* motor port */ Fintena= 0x4, /* enable floppy interrupt */ Fena= 0x8, /* 0 == reset controller */
1991/0924		/* digital output register */ Pdor= 0x3f2, Fintena= 0x8, /* enable floppy interrupt */ Fena= 0x4, /* 0 == reset controller */
1991/0727		Fstatus= 0x3f4, /* controller main status port */ Fready= 0x80, /* ready to be touched */ Ffrom= 0x40, /* data from controller */ Fbusy= 0x10, /* operation not over */
1991/0924		/* main status register */ Pmsr= 0x3f4, Fready= 0x80, /* ready to be touched */ Ffrom= 0x40, /* data from controller */ Fbusy= 0x10, /* operation not over */
1991/0727		Fdata= 0x3f5, /* controller data port */ Frecal= 0x7, /* recalibrate cmd */ Fseek= 0xf, /* seek cmd */ Fsense= 0x8, /* sense cmd */ Fread= 0x66, /* read cmd */
1991/0831		Fwrite= 0x45, /* write cmd */
1991/0727		Fmulti= 0x80, /* or'd with Fread or Fwrite for multi-head */
1991/0924		/* data register */ Pdata= 0x3f5, Frecal= 0x07, /* recalibrate cmd */ Fseek= 0x0f, /* seek cmd */ Fsense= 0x08, /* sense cmd */ Fread= 0x66, /* read cmd */ Freadid= 0x4a, /* read track id */ Fspec= 0x03, /* set hold times */ Fwrite= 0x45, /* write cmd */ Fmulti= 0x80, /* or'd with Fread or Fwrite for multi-head */ Fdumpreg= 0x0e, /* dump internal registers */
1991/0727
1991/0831		Fchanged= 0x3F7, /* disk changed register */ Fchange= 0x80, /* disk has changed */
1991/0924		/* digital input register */ Pdir= 0x3F7, /* disk changed port */ Fchange= 0x80, /* disk has changed */
1991/0831
1991/0728		DMAchan= 2, /* floppy dma channel */
1991/0727		/* status 0 byte */ Drivemask= 3<<0, Seekend= 1<<5,
1991/0921/sys/src/9/pc/devfloppy.c:46,51 – 1991/0924/sys/src/9/pc/devfloppy.c:52,59
1991/0802		Qdata= (1<<2),
1991/0920		Qctl= (2<<2),
1991/0802		Qmask= (3<<2),
1991/0924		DMAchan= 2, /* floppy dma channel */
1991/0727		}; /*
1991/0921/sys/src/9/pc/devfloppy.c:68,78 – 1991/0924/sys/src/9/pc/devfloppy.c:76,88
1991/0731		*/ int bcode; /* coded version of bytes for the controller */
1991/0727		long cap; /* drive capacity in bytes */
1991/0924		long tsize; /* track size in bytes */
1991/0727		}; Type floppytype[] = {
1991/0731		{ "MF2HD", 512, 18, 2, 1, 80, 0x1B, 0x54, }, { "MF2DD", 512, 9, 2, 1, 80, 0x1B, 0x54, },
1991/0924		{ "MF1DD", 512, 9, 2, 1, 80, 0x1B, 0x54, }, { "MF4HD", 1024, 18, 2, 1, 80, 0x1B, 0x54, },
1991/0731		{ "F2HD", 512, 15, 2, 1, 80, 0x2A, 0x50, }, { "F2DD", 512, 8, 2, 2, 40, 0x2A, 0x50, }, { "F1DD", 512, 8, 1, 2, 40, 0x2A, 0x50, },
1991/0921/sys/src/9/pc/devfloppy.c:111,117 – 1991/0924/sys/src/9/pc/devfloppy.c:121,127
1991/0727		ulong lasttouched; /* time last touched */ int cyl; /* current cylinder */ int confused; /* needs to be recalibrated (or worse) */
1991/0924		int confused; /* needs to be recalibrated */
1991/0727		int tcyl; /* target cylinder */ int thead; /* target head */
1991/0921/sys/src/9/pc/devfloppy.c:118,131 – 1991/0924/sys/src/9/pc/devfloppy.c:128,142
1991/0727		int tsec; /* target sector */
1991/0731		long len; /* size of xfer */
1991/0727
1991/0731		Rendez r; /* waiting here for motor to spin up */
1991/0924		uchar *cache; /* track cache */ int ccyl; int chead;
1991/0809		uchar *ccache; /* cylinder cache (always read a whole cyl) */ int ccyl; /* number of cached cylinder */
1991/0924		Rendez r; /* waiting here for motor to spin up */
1991/0727		}; /* * NEC PD765A controller for 4 floppys
1991/0924		* controller for 4 floppys
1991/0727		*/ struct Controller {
1991/0921/sys/src/9/pc/devfloppy.c:132,147 – 1991/0924/sys/src/9/pc/devfloppy.c:143,159
1991/0731		QLock; /* exclusive access to the contoller */
1991/0809		Drive *d; /* the floppy drives */
1991/0727		uchar stat[8]; /* status of an operation */ int confused;
1991/0731		int intr; /* true if interrupt occured */
1991/0924		uchar cmd[14]; /* command */ int ncmd; /* # command bytes */ uchar stat[14]; /* command status */ int nstat; /* # status bytes */ int confused; /* controler needs to be reset */
1991/0731		Rendez r; /* wait here for command termination */
1991/0921		int motor;
1991/0802
1991/0924		int motor; /* bit mask of spinning disks */
1991/0802		Rendez kr; /* for motor watcher */
1991/0727		};
1991/0728		Controller floppy;
1991/0924		Controller fl;
1991/0727
1991/0921		#define MOTORBIT(i) (1<<((i)+4))
1991/0921/sys/src/9/pc/devfloppy.c:148,167 – 1991/0924/sys/src/9/pc/devfloppy.c:160,180
1991/0727		/*
1991/0731		* predeclared */ static void motoron(Drive*); static void motoroff(Drive*);
1991/0924		static int floppycmd(void); static void floppyeject(Drive*);
1991/0731		static void floppykproc(void*); static int floppysend(int); static int floppyrcv(void); static int floppyresult(int);
1991/0924		static void floppyon(Drive*); static void floppyoff(Drive*);
1991/0802		static void floppypos(Drive*,long);
1991/0731		static int floppysense(Drive*); static int interrupted(void*); static int floppyrecal(Drive*);
1991/0924		static int floppyresult(void);
1991/0731		static void floppyrevive(void); static long floppyseek(Drive*);
1991/0924		static long floppyseek(Drive*, long); static int floppysense(void); static void floppywait(void);
1991/0802		static long floppyxfer(Drive*, int, void*, long, long);
1991/0731		static void floppyintr(Ureg*);
1991/0924		static int cmddone(void*); void Xdelay(int);
1991/0731
1991/0802		Dirtab floppydir[]={
1991/0823		"fd0disk", {Qdata + 0}, 0, 0600,
1991/0921/sys/src/9/pc/devfloppy.c:175,181 – 1991/0924/sys/src/9/pc/devfloppy.c:188,193
1991/0802		};
1991/0811		#define NFDIR 2 /* directory entries/drive */
1991/0731
1991/0809		#define k64(x) (((ulong)(x))>>16)
1991/0731		void floppyreset(void) {
1991/0921/sys/src/9/pc/devfloppy.c:182,187 – 1991/0924/sys/src/9/pc/devfloppy.c:194,201
1991/0731		Drive *dp;
1991/0802		Type *t;
1991/0810		int n;
1991/0924		ulong p; long l;
1991/0731
1991/0802		/* * init dependent parameters
1991/0921/sys/src/9/pc/devfloppy.c:189,224 – 1991/0924/sys/src/9/pc/devfloppy.c:203,240
1991/0802		for(t = floppytype; t < &floppytype[NTYPES]; t++){ t->cap = t->bytes * t->heads * t->sectors * t->tracks; t->bcode = b2c[t->bytes/128];
1991/0924		t->tsize = t->bytes * t->sectors;
1991/0802		} /*
1991/0809		* allocate the drive storage */ floppy.d = ialloc(conf.nfloppy*sizeof(Drive), 0);
1991/0924		fl.d = ialloc(conf.nfloppy*sizeof(Drive), 0);
1991/0809		/*
1991/0802		* stop the motors */
1991/0809		for(dp = floppy.d; dp < &floppy.d[conf.nfloppy]; dp++){
1991/0731		dp->dev = dp - floppy.d;
1991/0924		fl.motor = 0; delay(10); outb(Pdor, fl.motor | Fintena | Fena); delay(10); /* * init drives */ for(dp = fl.d; dp < &fl.d[conf.nfloppy]; dp++){ dp->dev = dp - fl.d;
1991/0731		dp->t = &floppytype[0]; /* default type */
1991/0811		floppydir[NFDIR*dp->dev].length = dp->t->cap;
1991/0921		floppy.motor |= MOTORBIT(dp->dev);
1991/0802		dp->cyl = -1; /* because we don't know */
1991/0731		motoroff(dp);
1991/0924		dp->cache = (uchar*)ialloc(dp->t->tsize, 1); dp->ccyl = -1;
1991/0731		}
1991/0809		/* * allocate cylinder caches that don't cross 64k boundaries
1991/0924		* first operation will recalibrate
1991/0809		*/ for(dp = floppy.d; dp < &floppy.d[conf.nfloppy]; dp++){ do {
1991/0810		n = 512 * 18 * 2; /* MF2HD cylinder size */ dp->ccache = ialloc(n, 1); } while(k64(dp->ccache) != k64(dp->ccache+n));
1991/0809		dp->ccyl = -1; }
1991/0731		setvec(Floppyvec, floppyintr);
1991/0924		fl.confused = 1;
1991/0731		} void
1991/0921/sys/src/9/pc/devfloppy.c:288,380 – 1991/0924/sys/src/9/pc/devfloppy.c:304,419
1991/0802		error(Eperm); }
1991/0809		/*
1991/0831		* look for a floppy change */ void
1991/0902		floppychanged(Drive *dp)
1991/0831		{ if((inb(Fchanged) & Fchange) == 0) return;
1991/0920		print("floppy has changed\n");
1991/0831		}                  /*
1991/0809		* the floppy is so slow, we always read a cylinder * at a time and cache the extra bytes. */
1991/0731		long floppyread(Chan *c, void *a, long n) { Drive *dp;
1991/0809		long rv, nn, len, cyl; int sec;
1991/0731		uchar *aa = a;
1991/0924		long rv, i; int nn, sec, head, cyl; long len; long noff; uchar *aa;
1991/0731
1991/0802		if(c->qid.path == CHDIR)
1991/0811		return devdirread(c, a, n, floppydir, conf.nfloppy*NFDIR, devgen);
1991/0802		rv = 0; dp = &floppy.d[c->qid.path & ~Qmask];
1991/0924		dp = &fl.d[c->qid.path & ~Qmask];
1991/0802		switch ((int)(c->qid.path & Qmask)) { case Qdata:
1991/0831		floppychanged(dp);
1991/0809		if(c->offset % dp->t->bytes) errors("bad offset"); if(n % dp->t->bytes) errors("bad len"); nn = dp->t->bytes * dp->t->sectors * dp->t->heads;
1991/0924		aa = a; nn = dp->t->tsize;
1991/0809		for(rv = 0; rv < n; rv += len){ /* * truncate xfer at cylinder boundary
1991/0924		* truncate xfer at track boundary
1991/0809		*/ dp->len = n - rv; floppypos(dp, c->offset+rv); cyl = dp->tcyl;
1991/0924		head = dp->thead;
1991/0809		len = dp->len; sec = dp->tsec + dp->thead * dp->t->sectors;
1991/0924		sec = dp->tsec;
1991/0809		/* * read the cylinder
1991/0924		* read the track
1991/0809		*/ if(dp->ccyl != cyl){
1991/0924		if(dp->ccyl!=cyl || dp->chead!=head){
1991/0809		dp->ccyl = -1; if(floppyxfer(dp, Fread, dp->ccache, cyl * nn, nn) != nn)
1991/0924		i = floppyxfer(dp, Fread, dp->cache, (cyl*dp->t->heads+head)*nn, nn); if(i != nn){ if(i == 0) break;
1991/0809		errors("floppy read err");
1991/0924		}
1991/0809		dp->ccyl = cyl;
1991/0924		dp->chead = head;
1991/0809		} memmove(aa+rv, dp->ccache + (sec-1)*dp->t->bytes, len);
1991/0924		memmove(aa+rv, dp->cache + (sec-1)*dp->t->bytes, len);
1991/0802		} break;
1991/0924		case Qctl: break;
1991/0802		default: panic("floppyread: bad qid");
1991/0731		}
1991/0924
1991/0731		return rv; }
1991/0924		#define SNCMP(a, b) strncmp(a, b, sizeof(b)-1)
1991/0731		long floppywrite(Chan *c, void *a, long n) { Drive *dp; long rv, i; uchar *aa = a;
1991/0924		char *aa = a; int dev;
1991/0731
1991/0802		rv = 0; dp = &floppy.d[c->qid.path & ~Qmask];
1991/0924		dp = &fl.d[c->qid.path & ~Qmask];
1991/0802		switch ((int)(c->qid.path & Qmask)) { case Qdata:
1991/0831		floppychanged(dp); dp->ccyl = -1;
1991/0924		if(c->offset % dp->t->bytes) errors("bad offset"); if(n % dp->t->bytes) errors("bad len");
1991/0802		for(rv = 0; rv < n; rv += i){ i = floppyxfer(dp, Fwrite, aa+rv, c->offset+rv, n-rv);
1991/0924		floppypos(dp, c->offset+rv); if(dp->tcyl == dp->ccyl) dp->ccyl = -1; i = floppyxfer(dp, Fwrite, aa+rv, c->offset+rv, n-rv);
1991/0802		if(i <= 0) break; } break;
1991/0924		case Qctl: if(SNCMP(aa, "eject") == 0){ floppyeject(dp); } else if(SNCMP(aa, "seek") == 0){ aa += 5; floppyseek(dp, strtoul(aa, 0, 0)); } else if(SNCMP(aa, "den") == 0){ aa += 4; i = strtoul(aa, 0, 0); USED(i); /* devp->dsr = i; devp->ccr = i;/**/ } else if(SNCMP(aa, "reset") == 0){ floppyon(dp); } break;
1991/0802		default: panic("floppywrite: bad qid");
1991/0731		}
1991/0924
1991/0731		return rv; }
1991/0921/sys/src/9/pc/devfloppy.c:382,434 – 1991/0924/sys/src/9/pc/devfloppy.c:421,473
1991/0731		floppykproc(void *a)
1991/0727		{ Drive *dp;
1991/0803		int disp = 0;
1991/0924		int i; static int last;
1991/0727
1991/0919		while(waserror()) ;
1991/0802		for(;;){
1991/0809		for(dp = floppy.d; dp < &floppy.d[conf.nfloppy]; dp++){
1991/0921		if((floppy.motor&MOTORBIT(dp->dev))
1991/0924		i = inb(Pdir) & 0x80; if(i != last) print("fromn %d to %d\n", last, i); last = i; for(dp = fl.d; dp < &fl.d[conf.nfloppy]; dp++){ if((fl.motor&MOTORBIT(dp->dev))
1991/0921		&& TK2SEC(m->ticks - dp->lasttouched) > 5
1991/0802		&& canqlock(dp)){ if(TK2SEC(m->ticks - dp->lasttouched) > 5) motoroff(dp);
1991/0924		floppyoff(dp);
1991/0802		qunlock(dp); }
1991/0728		}
1991/0803		disp++;
1991/0802		tsleep(&floppy.kr, return0, 0, 5*1000);
1991/0803
1991/0924		tsleep(&fl.kr, return0, 0, 5*100);
1991/0727		} }
1991/0921		static void driveselect(Drive *dp) { int cmd;                  cmd = floppy.motor | Fintena | Fena | dp->dev; outb(Fmotor, cmd); }
1991/0731		/*
1991/0921		* start a floppy drive's motor. set an alarm for .75 second later to * mark it as started (we get no interrupt to tell us). * * assume the caller qlocked the drive. * * this also selects the drive for subsequent operations
1991/0924		* start a floppy drive's motor.
1991/0921		*/ static void motoron(Drive *dp)
1991/0924		floppyon(Drive *dp)
1991/0921		{ int alreadyon;
1991/0924		int tries;
1991/0921		alreadyon = floppy.motor & MOTORBIT(dp->dev); floppy.motor |= MOTORBIT(dp->dev); driveselect(dp);
1991/0924		if(fl.confused) floppyrevive(); /* start motor and select drive */ alreadyon = fl.motor & MOTORBIT(dp->dev); fl.motor |= MOTORBIT(dp->dev); outb(Pdor, fl.motor | Fintena | Fena | dp->dev);
1991/0921		if(!alreadyon) tsleep(&dp->r, return0, 0, 750);
1991/0924		/* get drive to a known cylinder */ if(dp->confused) for(tries = 0; tries < 4; tries++) if(floppyrecal(dp) >= 0) break;
1991/0921		dp->lasttouched = m->ticks; }
1991/0921/sys/src/9/pc/devfloppy.c:436,584 – 1991/0924/sys/src/9/pc/devfloppy.c:475,613
1991/0921		* stop the floppy if it hasn't been used in 5 seconds */ static void motoroff(Drive *dp)
1991/0924		floppyoff(Drive *dp)
1991/0921		{ floppy.motor &= ~MOTORBIT(dp->dev); driveselect(dp);
1991/0924		fl.motor &= ~MOTORBIT(dp->dev); outb(Pdor, fl.motor | Fintena | Fena | dp->dev);
1991/0921		} /*
1991/0731		* send a byte to the floppy
1991/0924		* eject disk ( unknown on safari )
1991/0731		*/ static int
1991/0727		floppysend(int data)
1991/0924		static void floppyeject(Drive *dp)
1991/0727		{ int tries; uchar c;                  for(tries = 0; tries < 100; tries++){ /* * see if its ready for data */ c = inb(Fstatus); if((c&(Ffrom|Fready)) != Fready) continue;                  /* * send the data */ outb(Fdata, data); return 0; } return -1;
1991/0924		floppyon(dp); floppyoff(dp);
1991/0727		}
1991/0731		/* * get a byte from the floppy
1991/0924		* send a command to the floppy
1991/0731		*/ static int
1991/0727		floppyrcv(void)
1991/0924		floppycmd(void)
1991/0727		{
1991/0924		int i;
1991/0727		int tries; uchar c; for(tries = 0; tries < 100; tries++){ /* * see if its ready for data */ c = inb(Fstatus); if((c&(Ffrom|Fready)) != (Ffrom|Fready)) continue;                  /* * get data */ return inb(Fdata)&0xff;
1991/0924		for(i = 0; i < fl.ncmd; i++){ for(tries = 0; ; tries++){ if(tries > 1000){ print("cmd %ux can't be sent (%d %ux)\n", fl.cmd[0], i, inb(Pmsr)); fl.confused = 1; return -1; } if((inb(Pmsr)&(Ffrom|Fready)) == Fready) break; } outb(Pdata, fl.cmd[i]);
1991/0727		} return -1;
1991/0924		return 0;
1991/0727		}
1991/0731		/* * read a command result message from the floppy
1991/0924		* get a command result from the floppy * * when the controller goes ready waiting for a command * (instead of sending results), we're done *
1991/0731		*/ static int floppyresult(int n)
1991/0924		floppyresult(void)
1991/0727		{ int i; int c;
1991/0924		int i, s; int tries;
1991/0727		for(i = 0; i < n; i++){ c = floppyrcv(); if(c < 0) return -1; floppy.stat[i] = c;
1991/0924		for(i = 0; i < sizeof(fl.stat); i++){ for(tries = 0; ; tries++){ if(tries > 1000){ fl.confused = 1; return -1; } s = inb(Pmsr)&(Ffrom|Fready); if(s == Fready){ fl.nstat = i; return i; } if(s == (Ffrom|Fready)) break; } fl.stat[i] = inb(Pdata);
1991/0727		} return 0;
1991/0924		fl.nstat = i; return i;
1991/0727		}
1991/0731		/* * calculate physical address of a logical byte offset into the disk * * truncate dp->length if it crosses a cylinder boundary
1991/0924		* truncate dp->length if it crosses a track boundary
1991/0731		*/ static void
1991/0802		floppypos(Drive *dp, long off)
1991/0727		{ int lsec;
1991/0924		int ltrack;
1991/0727		int end; int cyl;
1991/0924		int track;
1991/0727
1991/0802		lsec = off/dp->t->bytes;
1991/0727		dp->tcyl = lsec/(dp->t->sectors*dp->t->heads);
1991/0924		ltrack = lsec/dp->t->sectors; dp->tcyl = ltrack/dp->t->heads;
1991/0727		dp->tsec = (lsec % dp->t->sectors) + 1; dp->thead = (lsec/dp->t->sectors) % dp->t->heads; /* * can't read across cylinder boundaries.
1991/0924		* can't read across track boundaries.
1991/0727		* if so, decrement the bytes to be read. */
1991/0802		lsec = (off+dp->len)/dp->t->bytes;
1991/0727		cyl = lsec/(dp->t->sectors*dp->t->heads); if(cyl != dp->tcyl){
1991/0731		dp->len -= (lsec % dp->t->sectors)*dp->t->bytes; dp->len -= ((lsec/dp->t->sectors) % dp->t->heads)*dp->t->bytes
1991/0727		*dp->t->sectors; }
1991/0924		end = (ltrack+1)*dp->t->sectors*dp->t->bytes; if(off+dp->len > end) dp->len = end - off;
1991/0727		}
1991/0731		/* * get the interrupt cause from the floppy. we need to do this * after seeks and recalibrations since they don't return results.
1991/0924		* get the interrupt cause from the floppy.
1991/0731		*/ static int
1991/0727		floppysense(Drive *dp)
1991/0924		floppysense(void)
1991/0727		{ /* * ask for floppy status */ if(floppysend(Fsense) < 0){ floppy.confused = 1;
1991/0924		fl.ncmd = 0; fl.cmd[fl.ncmd++] = Fsense; if(floppycmd() < 0)
1991/0727		return -1; }
1991/0731		if(floppyresult(2) < 0){
1991/0727		floppy.confused = 1; dp->confused = 1;
1991/0924		if(floppyresult() < 2){ print("can't read sense response\n"); fl.confused = 1;
1991/0727		return -1; }                  /* * make sure it's the right drive */
1991/0802		if((floppy.stat[0] & Drivemask) != dp->dev){
1991/0727		print("sense failed\n"); dp->confused = 1; return -1; } return 0; }
1991/0924		static int cmddone(void *a) { return fl.ncmd == 0; }
1991/0731		/* * return true if interrupt occurred
1991/0924		* wait for a floppy interrupt
1991/0731		*/ static int interrupted(void *a)
1991/0924		static void floppywait(void)
1991/0731		{ return floppy.intr;
1991/0924		tsleep(&fl.r, cmddone, 0, 2000);
1991/0731		} /*
1991/0921/sys/src/9/pc/devfloppy.c:587,621 – 1991/0924/sys/src/9/pc/devfloppy.c:616,641
1991/0731		static int
1991/0727		floppyrecal(Drive *dp) { floppy.intr = 0; if(floppysend(Frecal) < 0 || floppysend(dp - floppy.d) < 0){ floppy.confused = 0; return -1; }
1991/0731		sleep(&floppy.r, interrupted, 0);
1991/0924		int type;
1991/0727		/* * get return values */ if(floppysense(dp) < 0) return -1;
1991/0924		dp->ccyl = -1;
1991/0727		/* * see if it worked */ if((floppy.stat[0] & (Codemask|Seekend)) != Seekend){ print("recalibrate failed\n");
1991/0924		fl.ncmd = 0; fl.cmd[fl.ncmd++] = Frecal; fl.cmd[fl.ncmd++] = dp->dev; if(floppycmd() < 0) return -1; floppywait(); if(fl.nstat < 2){ fl.confused = 1; return -1; } if((fl.stat[0] & (Codemask|Seekend)) != Seekend){
1991/0727		dp->confused = 1; return -1; }                  /* * see what cylinder we got to */ dp->tcyl = 0; dp->cyl = floppy.stat[1]/dp->t->steps; if(dp->cyl != dp->tcyl){
1991/0924		dp->cyl = fl.stat[1]/dp->t->steps; if(dp->cyl != 0){
1991/0727		print("recalibrate went to wrong cylinder %d\n", dp->cyl); dp->confused = 1; return -1;
1991/0921/sys/src/9/pc/devfloppy.c:635,714 – 1991/0924/sys/src/9/pc/devfloppy.c:655,714
1991/0727		Drive *dp; /*
1991/0731		* reset the floppy if it's confused
1991/0924		* reset the controller if it's confused
1991/0727		*/ if(floppy.confused){
1991/0924		if(fl.confused){
1991/0727		/* reset controller and turn all motors off */ floppy.intr = 0; splhi(); outb(Fmotor, 0);
1991/0924		fl.cmd[0] = 0; outb(Pdor, 0);
1991/0727		delay(1); outb(Fmotor, Fintena|Fena);
1991/0924		outb(Pdor, Fintena|Fena);
1991/0727		spllo();
1991/0809		for(dp = floppy.d; dp < &floppy.d[conf.nfloppy]; dp++){
1991/0924		for(dp = fl.d; dp < &fl.d[conf.nfloppy]; dp++)
1991/0727		dp->confused = 1; }
1991/0921		floppy.motor = 0;
1991/0731		sleep(&floppy.r, interrupted, 0);
1991/0727		floppy.confused = 0;
1991/0924		fl.motor = 0; floppywait(); fl.confused = 0; /* devp->dsr = 0; devp->ccr = 0; /**/
1991/0727		}                  /* * recalibrate any confused drives */
1991/0809		for(dp = floppy.d; floppy.confused == 0 && dp < &floppy.d[conf.nfloppy]; dp++){
1991/0727		if(dp->confused == 0) floppyrecal(dp);                  }                  }
1991/0924		/* * seek to the target cylinder * * interrupt, no results */
1991/0731		static long floppyseek(Drive *dp)
1991/0924		floppyseek(Drive *dp, long off)
1991/0727		{
1991/0924		floppyon(dp); floppypos(dp, off);
1991/0802		if(dp->cyl == dp->tcyl) return dp->cyl;
1991/0727		/* * tell floppy to seek */
1991/0802		floppy.intr = 0; dp->cyl = -1; /* once the seek starts it could end anywhere */
1991/0727		if(floppysend(Fseek) < 0
1991/0731		|| floppysend((dp->thead<<2) | dp->dev) < 0
1991/0727		|| floppysend(dp->tcyl * dp->t->steps) < 0){
1991/0924		/* print("seeking tcyl %d, thead %d\n", dp->tcyl, dp->thead); /**/ fl.ncmd = 0; fl.cmd[fl.ncmd++] = Fseek; fl.cmd[fl.ncmd++] = (dp->thead<<2) | dp->dev; fl.cmd[fl.ncmd++] = dp->tcyl * dp->t->steps; if(floppycmd() < 0){
1991/0727		print("seek cmd failed\n"); floppy.confused = 1; return -1; }
1991/0731		sleep(&floppy.r, interrupted, 0);
1991/0727		/* * get floppy status */ if(floppysense(dp) < 0)
1991/0924		floppywait(); if(fl.nstat < 2){ fl.confused = 1;
1991/0727		return -1;                  /* * see if it worked */ if((floppy.stat[0] & (Codemask|Seekend)) != Seekend){
1991/0924		} if((fl.stat[0] & (Codemask|Seekend)) != Seekend){
1991/0727		print("seek failed\n"); dp->confused = 1; return -1; } /* * see what cylinder we got to */ dp->cyl = floppy.stat[1]/dp->t->steps; if(dp->cyl != dp->tcyl){ print("seek went to wrong cylinder %d instead of %d\n", dp->cyl, dp->tcyl); dp->confused = 1; return -1; }
1991/0924		dp->cyl = dp->tcyl;
1991/0802		return dp->cyl;
1991/0727		}
1991/0921/sys/src/9/pc/devfloppy.c:716,800 – 1991/0924/sys/src/9/pc/devfloppy.c:716,812
1991/0802		floppyxfer(Drive *dp, int cmd, void *a, long off, long n)
1991/0727		{ long offset;
1991/0924		ulong up;
1991/0727
1991/0731		qlock(&floppy);
1991/0924		if(off >= dp->t->cap) return 0; if(off + n > dp->t->cap) n = dp->t->cap - off; qlock(&fl);
1991/0731		qlock(dp);
1991/0802		if(waserror()){
1991/0731		qunlock(&floppy);
1991/0924		dmaend(DMAchan); qunlock(&fl);
1991/0731		qunlock(dp);
1991/0924		fl.confused = 1; nexterror();
1991/0731		}
1991/0727		/*
1991/0731		* get floppy reset and spinning
1991/0727		*/
1991/0731		if(floppy.confused || dp->confused) floppyrevive();
1991/0921		motoron(dp);
1991/0727
1991/0731		/* * calculate new position and seek to it (dp->len may be trimmed) */
1991/0727		dp->len = n;
1991/0802		floppypos(dp, off);
1991/0731		if(floppyseek(dp) < 0)
1991/0924		if(floppyseek(dp, off) < 0)
1991/0731		errors("seeking floppy");
1991/0727
1991/0906
1991/0823		/*print("tcyl %d, thead %d, tsec %d, addr %lux, n %d\n",
1991/0906		dp->tcyl, dp->thead, dp->tsec, a, n);/**/
1991/0924		dp->tcyl, dp->thead, dp->tsec, a, dp->len);/**/
1991/0727		/*
1991/0731		* set up the dma (dp->len may be trimmed)
1991/0727		*/
1991/0731		dp->len = dmasetup(2, a, dp->len, cmd==Fread);
1991/0924		dp->len = dmasetup(DMAchan, a, dp->len, cmd==Fread);
1991/0727		/*
1991/0731		* start operation
1991/0727		*/
1991/0802		floppy.intr = 0;
1991/0727		cmd = cmd | (dp->t->heads > 1 ? Fmulti : 0); if(floppysend(cmd) < 0
1991/0802		|| floppysend((dp->thead<<2) | dp->dev) < 0
1991/0727		|| floppysend(dp->tcyl * dp->t->steps) < 0 || floppysend(dp->thead) < 0 || floppysend(dp->tsec) < 0
1991/0731		|| floppysend(dp->t->bcode) < 0
1991/0727		|| floppysend(dp->t->sectors) < 0 || floppysend(dp->t->gpl) < 0 || floppysend(0xFF) < 0){
1991/0924		/* cmd = cmd | (dp->t->heads > 1 ? Fmulti : 0);/**/ fl.ncmd = 0; fl.cmd[fl.ncmd++] = cmd; fl.cmd[fl.ncmd++] = (dp->thead<<2) | dp->dev; fl.cmd[fl.ncmd++] = dp->tcyl * dp->t->steps; fl.cmd[fl.ncmd++] = dp->thead; fl.cmd[fl.ncmd++] = dp->tsec; fl.cmd[fl.ncmd++] = dp->t->bcode; fl.cmd[fl.ncmd++] = dp->tsec + dp->len/dp->t->bytes - 1; fl.cmd[fl.ncmd++] = dp->t->gpl; fl.cmd[fl.ncmd++] = 0xFF; if(floppycmd() < 0){ spllo();
1991/0727		print("xfer cmd failed\n"); floppy.confused = 1;
1991/0731		errors("floppy command failed");
1991/0727		}
1991/0731		sleep(&floppy.r, interrupted, 0);
1991/0727		/* * get status */
1991/0731		if(floppyresult(7) < 0){ print("xfer status failed\n");
1991/0727		floppy.confused = 1;
1991/0924		* give bus to DMA, floppyintr() will read result */ floppywait(); dmaend(DMAchan); /* * check for errors */ if(fl.nstat < 7){ print("xfer result failed %lux\n", inb(Pmsr)); fl.confused = 1;
1991/0731		errors("floppy result failed");
1991/0727		}                  if((floppy.stat[0] & Codemask)!=0 || floppy.stat[1] || floppy.stat[2]){ print("xfer failed %lux %lux %lux\n", floppy.stat[0], floppy.stat[1], floppy.stat[2]); dp->confused = 1;
1991/0731		errors("floppy drive lost");
1991/0924		if((fl.stat[0] & Codemask)!=0 || fl.stat[1] || fl.stat[2]){ if(fl.stat[1] != 0x80){ print("xfer failed %lux %lux %lux\n", fl.stat[0], fl.stat[1], fl.stat[2]); print("offset %lud len %d\n", off, dp->len); dp->confused = 1; errors("floppy drive lost"); } else fl.stat[5]++;
1991/0727		} offset = (floppy.stat[3]/dp->t->steps) * dp->t->heads + floppy.stat[4]; offset = offset*dp->t->sectors + floppy.stat[5] - 1;
1991/0731		offset = offset * c2b[floppy.stat[6]];
1991/0924		/* * check for correct cylinder */ offset = (fl.stat[3]/dp->t->steps) * dp->t->heads + fl.stat[4]; offset = offset*dp->t->sectors + fl.stat[5] - 1; offset = offset * c2b[fl.stat[6]];
1991/0802		if(offset != off+dp->len){ print("new offset %d instead of %d\n", offset, off+dp->len);
1991/0924		print("new offset %d instead of %d\n", offset, off+dp->len);
1991/0727		dp->confused = 1;
1991/0731		errors("floppy drive lost");
1991/0727		}
1991/0802		dp->lasttouched = m->ticks;
1991/0731		qunlock(&floppy);
1991/0924		qunlock(&fl);
1991/0731		qunlock(dp); poperror();
1991/0921/sys/src/9/pc/devfloppy.c:801,810 – 1991/0924/sys/src/9/pc/devfloppy.c:813,835
1991/0727		return dp->len; }
1991/0731		static void
1991/0727		floppyintr(Ureg *ur)
1991/0924		void floppyintr(void)
1991/0727		{
1991/0823		/*print("floppy intr\n");/**/
1991/0727		floppy.intr = 1;
1991/0731		wakeup(&floppy.r);
1991/0924		switch(fl.cmd[0]&~Fmulti){ case Fread: case Fwrite: floppyresult(); break; case Freadid: floppyresult(); break; case Fseek: case Frecal: default: floppysense(); /* to clear interrupt */ break; } fl.ncmd = 0; wakeup(&fl.r);
1991/0727		}