ref: 87d72e7e8614d96b4f61adae5fb05b0534231c4c
dir: /os/pc/devfloppy.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "floppy.h"
/* Intel 82077A (8272A compatible) floppy controller */
/* This module expects the following functions to be defined
* elsewhere:
*
* inb()
* outb()
* floppyexec()
* floppyeject()
* floppysetup0()
* floppysetup1()
* dmainit()
* dmasetup()
* dmaend()
*
* On DMA systems, floppyexec() should be an empty function;
* on non-DMA systems, dmaend() should be an empty function;
* dmasetup() may enforce maximum transfer sizes.
*/
enum {
/* file types */
Qdir= 0,
Qdata= (1<<2),
Qctl= (2<<2),
Qmask= (3<<2),
DMAchan= 2, /* floppy dma channel */
};
#define DPRINT if(floppydebug)print
int floppydebug = 0;
/*
* types of drive (from PC equipment byte)
*/
enum
{
Tnone= 0,
T360kb= 1,
T1200kb= 2,
T720kb= 3,
T1440kb= 4,
};
FType floppytype[] =
{
{ "3½HD", T1440kb, 512, 18, 2, 1, 80, 0x1B, 0x54, 0, },
{ "3½DD", T1440kb, 512, 9, 2, 1, 80, 0x1B, 0x54, 2, },
{ "3½DD", T720kb, 512, 9, 2, 1, 80, 0x1B, 0x54, 2, },
{ "5¼HD", T1200kb, 512, 15, 2, 1, 80, 0x2A, 0x50, 0, },
{ "5¼DD", T1200kb, 512, 9, 2, 2, 40, 0x2A, 0x50, 1, },
{ "ATT3B1", T1200kb, 512, 8, 2, 2, 48, 0x2A, 0x50, 1, },
{ "5¼DD", T360kb, 512, 9, 2, 1, 40, 0x2A, 0x50, 2, },
};
/*
* bytes per sector encoding for the controller.
* - index for b2c is is (bytes per sector/128).
* - index for c2b is code from b2c
*/
static int b2c[] =
{
[1] 0,
[2] 1,
[4] 2,
[8] 3,
};
static int c2b[] =
{
128,
256,
512,
1024,
};
FController fl;
#define MOTORBIT(i) (1<<((i)+4))
/*
* predeclared
*/
static int cmddone(void*);
static void floppyformat(FDrive*, Cmdbuf*);
static void floppykproc(void*);
static void floppypos(FDrive*,long);
static int floppyrecal(FDrive*);
static int floppyresult(void);
static void floppyrevive(void);
static long floppyseek(FDrive*, long);
static int floppysense(void);
static void floppywait(int);
static long floppyxfer(FDrive*, int, void*, long, long);
Dirtab floppydir[]={
".", {Qdir, 0, QTDIR}, 0, 0550,
"fd0disk", {Qdata + 0}, 0, 0660,
"fd0ctl", {Qctl + 0}, 0, 0660,
"fd1disk", {Qdata + 1}, 0, 0660,
"fd1ctl", {Qctl + 1}, 0, 0660,
"fd2disk", {Qdata + 2}, 0, 0660,
"fd2ctl", {Qctl + 2}, 0, 0660,
"fd3disk", {Qdata + 3}, 0, 0660,
"fd3ctl", {Qctl + 3}, 0, 0660,
};
#define NFDIR 2 /* directory entries/drive */
enum
{
CMdebug,
CMnodebug,
CMeject,
CMformat,
CMreset,
};
static Cmdtab floppyctlmsg[] =
{
CMdebug, "debug", 1,
CMnodebug, "nodebug", 1,
CMeject, "eject", 1,
CMformat, "format", 0,
CMreset, "reset", 1,
};
static void
fldump(void)
{
DPRINT("sra %ux srb %ux dor %ux msr %ux dir %ux\n", inb(Psra), inb(Psrb),
inb(Pdor), inb(Pmsr), inb(Pdir));
}
/*
* set floppy drive to its default type
*/
static void
floppysetdef(FDrive *dp)
{
FType *t;
for(t = floppytype; t < &floppytype[nelem(floppytype)]; t++)
if(dp->dt == t->dt){
dp->t = t;
floppydir[1+NFDIR*dp->dev].length = dp->t->cap;
break;
}
}
static void
floppyreset(void)
{
FDrive *dp;
FType *t;
ulong maxtsize;
floppysetup0(&fl);
if(fl.ndrive == 0)
return;
/*
* init dependent parameters
*/
maxtsize = 0;
for(t = floppytype; t < &floppytype[nelem(floppytype)]; t++){
t->cap = t->bytes * t->heads * t->sectors * t->tracks;
t->bcode = b2c[t->bytes/128];
t->tsize = t->bytes * t->sectors;
if(maxtsize < t->tsize)
maxtsize = t->tsize;
}
dmainit(DMAchan, maxtsize);
/*
* allocate the drive storage
*/
fl.d = xalloc(fl.ndrive*sizeof(FDrive));
fl.selected = fl.d;
/*
* stop the motors
*/
fl.motor = 0;
delay(10);
outb(Pdor, fl.motor | Fintena | Fena);
delay(10);
/*
* init drives
*/
for(dp = fl.d; dp < &fl.d[fl.ndrive]; dp++){
dp->dev = dp - fl.d;
dp->dt = T1440kb;
floppysetdef(dp);
dp->cyl = -1; /* because we don't know */
dp->cache = (uchar*)xspanalloc(maxtsize, BY2PG, 64*1024);
dp->ccyl = -1;
dp->vers = 0;
}
/*
* first operation will recalibrate
*/
fl.confused = 1;
floppysetup1(&fl);
}
static Chan*
floppyattach(char *spec)
{
static int kstarted;
if(fl.ndrive == 0)
error(Enodev);
if(kstarted == 0){
/*
* watchdog to turn off the motors
*/
kstarted = 1;
kproc("floppy", floppykproc, 0, 0);
}
return devattach('f', spec);
}
static Walkqid*
floppywalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, floppydir, 1+fl.ndrive*NFDIR, devgen);
}
static int
floppystat(Chan *c, uchar *dp, int n)
{
return devstat(c, dp, n, floppydir, 1+fl.ndrive*NFDIR, devgen);
}
static Chan*
floppyopen(Chan *c, int omode)
{
return devopen(c, omode, floppydir, 1+fl.ndrive*NFDIR, devgen);
}
static void
floppyclose(Chan *)
{
}
static void
islegal(ulong offset, long n, FDrive *dp)
{
if(offset % dp->t->bytes)
error(Ebadarg);
if(n % dp->t->bytes)
error(Ebadarg);
}
/*
* check if the floppy has been replaced under foot. cause
* an error if it has.
*
* a seek and a read clears the condition. this was determined
* experimentally, there has to be a better way.
*
* if the read fails, cycle through the possible floppy
* density till one works or we've cycled through all
* possibilities for this drive.
*/
static void
changed(Chan *c, FDrive *dp)
{
ulong old;
FType *start;
/*
* if floppy has changed or first time through
*/
if((inb(Pdir)&Fchange) || dp->vers == 0){
DPRINT("changed\n");
fldump();
dp->vers++;
start = dp->t;
dp->maxtries = 3; /* limit it when we're probing */
/* floppyon will fail if there's a controller but no drive */
dp->confused = 1; /* make floppyon recal */
if(floppyon(dp) < 0)
error(Eio);
/* seek to the first track */
floppyseek(dp, dp->t->heads*dp->t->tsize);
while(waserror()){
/*
* if first attempt doesn't reset changed bit, there's
* no floppy there
*/
if(inb(Pdir)&Fchange)
nexterror();
while(++dp->t){
if(dp->t == &floppytype[nelem(floppytype)])
dp->t = floppytype;
if(dp->dt == dp->t->dt)
break;
}
floppydir[1+NFDIR*dp->dev].length = dp->t->cap;
/* floppyon will fail if there's a controller but no drive */
if(floppyon(dp) < 0)
error(Eio);
DPRINT("changed: trying %s\n", dp->t->name);
fldump();
if(dp->t == start)
nexterror();
}
/* if the read succeeds, we've got the density right */
floppyxfer(dp, Fread, dp->cache, 0, dp->t->tsize);
poperror();
dp->maxtries = 20;
}
old = c->qid.vers;
c->qid.vers = dp->vers;
if(old && old != dp->vers)
error(Eio);
}
static int
readtrack(FDrive *dp, int cyl, int head)
{
int i, nn, sofar;
ulong pos;
nn = dp->t->tsize;
if(dp->ccyl==cyl && dp->chead==head)
return nn;
pos = (cyl*dp->t->heads+head) * nn;
for(sofar = 0; sofar < nn; sofar += i){
dp->ccyl = -1;
i = floppyxfer(dp, Fread, dp->cache + sofar, pos + sofar, nn - sofar);
if(i <= 0)
return -1;
}
dp->ccyl = cyl;
dp->chead = head;
return nn;
}
static long
floppyread(Chan *c, void *a, long n, vlong off)
{
FDrive *dp;
long rv;
int sec, head, cyl;
long len;
uchar *aa;
ulong offset = off;
if(c->qid.type & QTDIR)
return devdirread(c, a, n, floppydir, 1+fl.ndrive*NFDIR, devgen);
rv = 0;
dp = &fl.d[c->qid.path & ~Qmask];
switch ((int)(c->qid.path & Qmask)) {
case Qdata:
islegal(offset, n, dp);
aa = a;
qlock(&fl);
if(waserror()){
qunlock(&fl);
nexterror();
}
floppyon(dp);
changed(c, dp);
for(rv = 0; rv < n; rv += len){
/*
* all xfers come out of the track cache
*/
dp->len = n - rv;
floppypos(dp, offset+rv);
cyl = dp->tcyl;
head = dp->thead;
len = dp->len;
sec = dp->tsec;
if(readtrack(dp, cyl, head) < 0)
break;
memmove(aa+rv, dp->cache + (sec-1)*dp->t->bytes, len);
}
qunlock(&fl);
poperror();
break;
case Qctl:
return readstr(offset, a, n, dp->t->name);
default:
panic("floppyread: bad qid");
}
return rv;
}
static long
floppywrite(Chan *c, void *a, long n, vlong off)
{
FDrive *dp;
long rv, i;
char *aa = a;
Cmdbuf *cb;
Cmdtab *ct;
ulong offset = off;
rv = 0;
dp = &fl.d[c->qid.path & ~Qmask];
switch ((int)(c->qid.path & Qmask)) {
case Qdata:
islegal(offset, n, dp);
qlock(&fl);
if(waserror()){
qunlock(&fl);
nexterror();
}
floppyon(dp);
changed(c, dp);
for(rv = 0; rv < n; rv += i){
floppypos(dp, offset+rv);
if(dp->tcyl == dp->ccyl)
dp->ccyl = -1;
i = floppyxfer(dp, Fwrite, aa+rv, offset+rv, n-rv);
if(i < 0)
break;
if(i == 0)
error(Eio);
}
qunlock(&fl);
poperror();
break;
case Qctl:
rv = n;
cb = parsecmd(a, n);
if(waserror()){
free(cb);
nexterror();
}
qlock(&fl);
if(waserror()){
qunlock(&fl);
nexterror();
}
ct = lookupcmd(cb, floppyctlmsg, nelem(floppyctlmsg));
switch(ct->index){
case CMeject:
floppyeject(dp);
break;
case CMformat:
floppyformat(dp, cb);
break;
case CMreset:
fl.confused = 1;
floppyon(dp);
break;
case CMdebug:
floppydebug = 1;
break;
case CMnodebug:
floppydebug = 0;
break;
}
poperror();
qunlock(&fl);
poperror();
free(cb);
break;
default:
panic("floppywrite: bad qid");
}
return rv;
}
static void
floppykproc(void *)
{
FDrive *dp;
while(waserror())
;
for(;;){
for(dp = fl.d; dp < &fl.d[fl.ndrive]; dp++){
if((fl.motor&MOTORBIT(dp->dev))
&& TK2SEC(m->ticks - dp->lasttouched) > 5
&& canqlock(&fl)){
if(TK2SEC(m->ticks - dp->lasttouched) > 5)
floppyoff(dp);
qunlock(&fl);
}
}
tsleep(&up->sleep, return0, 0, 1000);
}
}
/*
* start a floppy drive's motor.
*/
static int
floppyon(FDrive *dp)
{
int alreadyon;
int tries;
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);
if(!alreadyon){
/* wait for drive to spin up */
tsleep(&up->sleep, return0, 0, 750);
/* clear any pending interrupts */
floppysense();
}
/* set transfer rate */
if(fl.rate != dp->t->rate){
fl.rate = dp->t->rate;
outb(Pdsr, fl.rate);
}
/* get drive to a known cylinder */
if(dp->confused)
for(tries = 0; tries < 4; tries++)
if(floppyrecal(dp) >= 0)
break;
dp->lasttouched = m->ticks;
fl.selected = dp;
/* return -1 if this didn't work */
if(dp->confused)
return -1;
return 0;
}
/*
* stop the floppy if it hasn't been used in 5 seconds
*/
static void
floppyoff(FDrive *dp)
{
fl.motor &= ~MOTORBIT(dp->dev);
outb(Pdor, fl.motor | Fintena | Fena | dp->dev);
}
/*
* send a command to the floppy
*/
static int
floppycmd(void)
{
int i;
int tries;
fl.nstat = 0;
for(i = 0; i < fl.ncmd; i++){
for(tries = 0; ; tries++){
if((inb(Pmsr)&(Ffrom|Fready)) == Fready)
break;
if(tries > 1000){
DPRINT("cmd %ux can't be sent (%d)\n", fl.cmd[0], i);
fldump();
/* empty fifo, might have been a bad command */
floppyresult();
return -1;
}
microdelay(8); /* for machine independence */
}
outb(Pfdata, fl.cmd[i]);
}
return 0;
}
/*
* get a command result from the floppy
*
* when the controller goes ready waiting for a command
* (instead of sending results), we're done
*
*/
static int
floppyresult(void)
{
int i, s;
int tries;
/* get the result of the operation */
for(i = 0; i < sizeof(fl.stat); i++){
/* wait for status byte */
for(tries = 0; ; tries++){
s = inb(Pmsr)&(Ffrom|Fready);
if(s == Fready){
fl.nstat = i;
return fl.nstat;
}
if(s == (Ffrom|Fready))
break;
if(tries > 1000){
DPRINT("floppyresult: %d stats\n", i);
fldump();
fl.confused = 1;
return -1;
}
microdelay(8); /* for machine independence */
}
fl.stat[i] = inb(Pfdata);
}
fl.nstat = sizeof(fl.stat);
return fl.nstat;
}
/*
* calculate physical address of a logical byte offset into the disk
*
* truncate dp->length if it crosses a track boundary
*/
static void
floppypos(FDrive *dp, long off)
{
int lsec;
int ltrack;
int end;
lsec = off/dp->t->bytes;
ltrack = lsec/dp->t->sectors;
dp->tcyl = ltrack/dp->t->heads;
dp->tsec = (lsec % dp->t->sectors) + 1;
dp->thead = (lsec/dp->t->sectors) % dp->t->heads;
/*
* can't read across track boundaries.
* if so, decrement the bytes to be read.
*/
end = (ltrack+1)*dp->t->sectors*dp->t->bytes;
if(off+dp->len > end)
dp->len = end - off;
}
/*
* get the interrupt cause from the floppy.
*/
static int
floppysense(void)
{
fl.ncmd = 0;
fl.cmd[fl.ncmd++] = Fsense;
if(floppycmd() < 0)
return -1;
if(floppyresult() < 2){
DPRINT("can't read sense response\n");
fldump();
fl.confused = 1;
return -1;
}
return 0;
}
static int
cmddone(void *)
{
return fl.ncmd == 0;
}
/*
* Wait for a floppy interrupt. If none occurs in 5 seconds, we
* may have missed one. This only happens on some portables which
* do power management behind our backs. Call the interrupt
* routine to try to clear any conditions.
*/
static void
floppywait(int slow)
{
tsleep(&fl.r, cmddone, 0, slow ? 5000 : 1000);
if(!cmddone(0)){
floppyintr(0);
fl.confused = 1;
}
}
/*
* we've lost the floppy position, go to cylinder 0.
*/
static int
floppyrecal(FDrive *dp)
{
dp->ccyl = -1;
dp->cyl = -1;
fl.ncmd = 0;
fl.cmd[fl.ncmd++] = Frecal;
fl.cmd[fl.ncmd++] = dp->dev;
if(floppycmd() < 0)
return -1;
floppywait(1);
if(fl.nstat < 2){
DPRINT("recalibrate: confused %ux\n", inb(Pmsr));
fl.confused = 1;
return -1;
}
if((fl.stat[0] & (Codemask|Seekend)) != Seekend){
DPRINT("recalibrate: failed\n");
dp->confused = 1;
return -1;
}
dp->cyl = fl.stat[1];
if(dp->cyl != 0){
DPRINT("recalibrate: wrong cylinder %d\n", dp->cyl);
dp->cyl = -1;
dp->confused = 1;
return -1;
}
dp->confused = 0;
return 0;
}
/*
* if the controller or a specific drive is in a confused state,
* reset it and get back to a known state
*/
static void
floppyrevive(void)
{
FDrive *dp;
/*
* reset the controller if it's confused
*/
if(fl.confused){
DPRINT("floppyrevive in\n");
fldump();
/* reset controller and turn all motors off */
splhi();
fl.ncmd = 1;
fl.cmd[0] = 0;
outb(Pdor, 0);
delay(10);
outb(Pdor, Fintena|Fena);
delay(10);
spllo();
fl.motor = 0;
fl.confused = 0;
floppywait(0);
/* mark all drives in an unknown state */
for(dp = fl.d; dp < &fl.d[fl.ndrive]; dp++)
dp->confused = 1;
/* set rate to a known value */
outb(Pdsr, 0);
fl.rate = 0;
DPRINT("floppyrevive out\n");
fldump();
}
}
/*
* seek to the target cylinder
*
* interrupt, no results
*/
static long
floppyseek(FDrive *dp, long off)
{
floppypos(dp, off);
if(dp->cyl == dp->tcyl)
return dp->tcyl;
dp->cyl = -1;
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)
return -1;
floppywait(1);
if(fl.nstat < 2){
DPRINT("seek: confused\n");
fl.confused = 1;
return -1;
}
if((fl.stat[0] & (Codemask|Seekend)) != Seekend){
DPRINT("seek: failed\n");
dp->confused = 1;
return -1;
}
dp->cyl = dp->tcyl;
return dp->tcyl;
}
/*
* read or write to floppy. try up to three times.
*/
static long
floppyxfer(FDrive *dp, int cmd, void *a, long off, long n)
{
long offset;
int tries;
if(off >= dp->t->cap)
return 0;
if(off + n > dp->t->cap)
n = dp->t->cap - off;
/* retry on error (until it gets ridiculous) */
tries = 0;
while(waserror()){
if(tries++ >= dp->maxtries)
nexterror();
DPRINT("floppyxfer: retrying\n");
}
dp->len = n;
if(floppyseek(dp, off) < 0){
DPRINT("xfer: seek failed\n");
dp->confused = 1;
error(Eio);
}
/*
* set up the dma (dp->len may be trimmed)
*/
if(waserror()){
dmaend(DMAchan);
nexterror();
}
dp->len = dmasetup(DMAchan, a, dp->len, cmd==Fread);
if(dp->len < 0)
error(Eio);
/*
* start operation
*/
fl.ncmd = 0;
fl.cmd[fl.ncmd++] = cmd | (dp->t->heads > 1 ? Fmulti : 0);
fl.cmd[fl.ncmd++] = (dp->thead<<2) | dp->dev;
fl.cmd[fl.ncmd++] = dp->tcyl;
fl.cmd[fl.ncmd++] = dp->thead;
fl.cmd[fl.ncmd++] = dp->tsec;
fl.cmd[fl.ncmd++] = dp->t->bcode;
fl.cmd[fl.ncmd++] = dp->t->sectors;
fl.cmd[fl.ncmd++] = dp->t->gpl;
fl.cmd[fl.ncmd++] = 0xFF;
if(floppycmd() < 0)
error(Eio);
/* Poll ready bits and transfer data */
floppyexec((char*)a, dp->len, cmd==Fread);
/*
* give bus to DMA, floppyintr() will read result
*/
floppywait(0);
dmaend(DMAchan);
poperror();
/*
* check for errors
*/
if(fl.nstat < 7){
DPRINT("xfer: confused\n");
fl.confused = 1;
error(Eio);
}
if((fl.stat[0] & Codemask)!=0 || fl.stat[1] || fl.stat[2]){
DPRINT("xfer: failed %ux %ux %ux\n", fl.stat[0],
fl.stat[1], fl.stat[2]);
DPRINT("offset %lud len %ld\n", off, dp->len);
if((fl.stat[0]&Codemask)==Cmdexec && fl.stat[1]==Overrun){
DPRINT("DMA overrun: retry\n");
} else
dp->confused = 1;
error(Eio);
}
/*
* check for correct cylinder
*/
offset = fl.stat[3] * dp->t->heads + fl.stat[4];
offset = offset*dp->t->sectors + fl.stat[5] - 1;
offset = offset * c2b[fl.stat[6]];
if(offset != off+dp->len){
DPRINT("xfer: ends on wrong cyl\n");
dp->confused = 1;
error(Eio);
}
poperror();
dp->lasttouched = m->ticks;
return dp->len;
}
/*
* format a track
*/
static void
floppyformat(FDrive *dp, Cmdbuf *cb)
{
int cyl, h, sec;
ulong track;
uchar *buf, *bp;
FType *t;
/*
* set the type
*/
if(cb->nf == 2){
for(t = floppytype; t < &floppytype[nelem(floppytype)]; t++){
if(strcmp(cb->f[1], t->name)==0 && t->dt==dp->dt){
dp->t = t;
floppydir[1+NFDIR*dp->dev].length = dp->t->cap;
break;
}
}
if(t >= &floppytype[nelem(floppytype)])
error(Ebadarg);
} else if(cb->nf == 1){
floppysetdef(dp);
t = dp->t;
} else {
cmderror(cb, "invalid floppy format command");
SET(t);
}
/*
* buffer for per track info
*/
buf = smalloc(t->sectors*4);
if(waserror()){
free(buf);
nexterror();
}
/* force a recalibrate to cylinder 0 */
dp->confused = 1;
if(!waserror()){
floppyon(dp);
poperror();
}
/*
* format a track at time
*/
for(track = 0; track < t->tracks*t->heads; track++){
cyl = track/t->heads;
h = track % t->heads;
/*
* seek to track, ignore errors
*/
floppyseek(dp, track*t->tsize);
dp->cyl = cyl;
dp->confused = 0;
/*
* set up the dma (dp->len may be trimmed)
*/
bp = buf;
for(sec = 1; sec <= t->sectors; sec++){
*bp++ = cyl;
*bp++ = h;
*bp++ = sec;
*bp++ = t->bcode;
}
if(waserror()){
dmaend(DMAchan);
nexterror();
}
if(dmasetup(DMAchan, buf, bp-buf, 0) < 0)
error(Eio);
/*
* start operation
*/
fl.ncmd = 0;
fl.cmd[fl.ncmd++] = Fformat;
fl.cmd[fl.ncmd++] = (h<<2) | dp->dev;
fl.cmd[fl.ncmd++] = t->bcode;
fl.cmd[fl.ncmd++] = t->sectors;
fl.cmd[fl.ncmd++] = t->fgpl;
fl.cmd[fl.ncmd++] = 0x5a;
if(floppycmd() < 0)
error(Eio);
/* Poll ready bits and transfer data */
floppyexec((char *)buf, bp-buf, 0);
/*
* give bus to DMA, floppyintr() will read result
*/
floppywait(1);
dmaend(DMAchan);
poperror();
/*
* check for errors
*/
if(fl.nstat < 7){
DPRINT("format: confused\n");
fl.confused = 1;
error(Eio);
}
if((fl.stat[0]&Codemask)!=0 || fl.stat[1]|| fl.stat[2]){
DPRINT("format: failed %ux %ux %ux\n",
fl.stat[0], fl.stat[1], fl.stat[2]);
dp->confused = 1;
error(Eio);
}
}
free(buf);
dp->confused = 1;
poperror();
}
static void
floppyintr(Ureg *)
{
switch(fl.cmd[0]&~Fmulti){
case Fread:
case Fwrite:
case Fformat:
case Fdumpreg:
floppyresult();
break;
case Fseek:
case Frecal:
default:
floppysense(); /* to clear interrupt */
break;
}
fl.ncmd = 0;
wakeup(&fl.r);
}
Dev floppydevtab = {
'f',
"floppy",
floppyreset,
devinit,
devshutdown,
floppyattach,
floppywalk,
floppystat,
floppyopen,
devcreate,
floppyclose,
floppyread,
devbread,
floppywrite,
devbwrite,
devremove,
devwstat,
};