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a8e9d1d5b7
freebsd-dev/sys/i386/isa/wd.c
Rodney W. Grimes a8e9d1d5b7 Increased TIMEOUT in wdwait from 2000 to 20000 since it seems many people 
have needed to do this in order for the wd driver to work for them.
1994-01-22 11:00:01 +00:00

1510 lines
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static int wdtest = 0;
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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.
*
* from: @(#)wx.c 7.2 (Berkeley) 5/9/91
* $Id: wd.c,v 1.21 1994/01/08 00:00:52 nate Exp $
*/
/* TODO:peel out buffer at low ipl, speed improvement */
#include "wd.h"
#if NWDC > 0
#include "param.h"
#include "dkbad.h"
#include "systm.h"
#include "kernel.h"
#include "conf.h"
#include "file.h"
#include "stat.h"
#include "ioctl.h"
#include "disklabel.h"
#include "buf.h"
#include "uio.h"
#include "malloc.h"
#include "machine/cpu.h"
#include "i386/isa/isa.h"
#include "i386/isa/isa_device.h"
#include "i386/isa/icu.h"
#include "i386/isa/wdreg.h"
#include "syslog.h"
#include "vm/vm.h"
#ifndef WDCTIMEOUT
#define WDCTIMEOUT 10000000 /* arbitrary timeout for drive ready waits */
#endif
#define RETRIES 5 /* number of retries before giving up */
#define RECOVERYTIME 500000 /* usec for controller to recover after err */
#define MAXTRANSFER 32 /* max size of transfer in page clusters */
#define wdnoreloc(dev) (minor(dev) & 0x80) /* ignore partition table */
#define wddospart(dev) (minor(dev) & 0x40) /* use dos partitions */
#define wdunit(dev) ((minor(dev) & 0x38) >> 3)
#define wdpart(dev) (minor(dev) & 0x7)
#define makewddev(maj, unit, part) (makedev(maj,((unit<<3)+part)))
#define WDRAW 3 /* 'd' partition isn't a partition! */
#define b_cylin b_resid /* cylinder number for doing IO to */
/* shares an entry in the buf struct */
#define id_physid id_scsiid /* this biotab field doubles as a field */
/* for the physical unit number on the controller */
/*
* Drive states. Used to initialize drive.
*/
#define CLOSED 0 /* disk is closed. */
#define WANTOPEN 1 /* open requested, not started */
#define RECAL 2 /* doing restore */
#define OPEN 3 /* done with open */
/*
* The structure of a disk drive.
*/
struct disk {
long dk_bc; /* byte count left */
short dk_skip; /* blocks already transferred */
char dk_ctrlr; /* physical controller number */
char dk_unit; /* physical unit number */
char dk_lunit; /* logical unit number */
char dk_state; /* control state */
u_char dk_status; /* copy of status reg. */
u_char dk_error; /* copy of error reg. */
short dk_port; /* i/o port base */
u_long dk_copenpart; /* character units open on this drive */
u_long dk_bopenpart; /* block units open on this drive */
u_long dk_openpart; /* all units open on this drive */
short dk_wlabel; /* label writable? */
short dk_flags; /* drive characteistics found */
#define DKFL_DOSPART 0x00001 /* has DOS partition table */
#define DKFL_SINGLE 0x00004 /* sector at a time mode */
#define DKFL_ERROR 0x00008 /* processing a disk error */
#define DKFL_BSDLABEL 0x00010 /* has a BSD disk label */
#define DKFL_BADSECT 0x00020 /* has a bad144 badsector table */
#define DKFL_WRITEPROT 0x00040 /* manual unit write protect */
#define DKFL_LABELLING 0x00080 /* readdisklabel() in progress */
struct wdparams dk_params; /* ESDI/IDE drive/controller parameters */
struct disklabel dk_dd; /* device configuration data */
struct dos_partition
dk_dospartitions[NDOSPART]; /* DOS view of disk */
struct dkbad dk_bad; /* bad sector table */
};
/*static*/ struct disk *wddrives[NWD]; /* table of units */
static struct buf wdtab[NWDC];
static struct buf wdutab[NWD]; /* head of queue per drive */
#ifdef notyet
static struct buf rwdbuf[NWD]; /* buffers for raw IO */
#endif
static long wdxfer[NWD]; /* count of transfers */
static int wdprobe(struct isa_device *dvp);
static int wdattach(struct isa_device *dvp);
static void wdustart(struct disk *du);
static void wdstart(int ctrlr);
static int wdcontrol(struct buf *bp);
static int wdcommand(struct disk *du, u_int cylinder, u_int head,
u_int sector, u_int count, u_int command);
static int wdsetctlr(struct disk *du);
static int wdwsetctlr(struct disk *du);
static int wdgetctlr(struct disk *du);
static void wderror(struct buf *bp, struct disk *du, char *mesg);
static int wdreset(struct disk *du);
static void wdsleep(int ctrlr, char *wmesg);
static int wdunwedge(struct disk *du);
static int wdwait(struct disk *du, u_char bits_wanted);
struct isa_driver wdcdriver = {
wdprobe, wdattach, "wdc",
};
/*
* Probe for controller.
*/
static int
wdprobe(struct isa_device *dvp)
{
int unit = dvp->id_unit;
int u;
struct disk *du;
int wdc;
if (unit >= NWDC) /* 31 Jul 92*/
return(0);
du = malloc (sizeof(struct disk), M_TEMP, M_NOWAIT);
bzero (du, sizeof(struct disk)); /* 31 Jul 92*/
du->dk_ctrlr = dvp->id_unit;
du->dk_unit = 0;
du->dk_lunit = 0;
wdc = du->dk_port = dvp->id_iobase;
/* check if we have registers that work */
outb(wdc+wd_cyl_lo, 0xa5) ; /* wd_cyl_lo is read/write */
if(inb(wdc+wd_cyl_lo) != 0xa5)
goto nodevice;
if (wdreset(du) != 0 && (DELAY(RECOVERYTIME), wdreset(du)) != 0)
goto nodevice;
/* execute a controller only command */
if (wdcommand(du, 0, 0, 0, 0, WDCC_DIAGNOSE) != 0
|| wdwait(du, 0) != 0)
goto nodevice;
free(du, M_TEMP);
return (IO_WDCSIZE);
nodevice:
free(du, M_TEMP);
return (0);
}
/*
* Attach each drive if possible.
*/
static int
wdattach(struct isa_device *dvp)
{
int unit, lunit;
struct isa_device *wdup;
struct disk *du;
if (dvp->id_unit >= NWDC)
return(0);
printf("wdc%d:", dvp->id_unit);
for (wdup = isa_biotab_wdc; wdup->id_driver != 0; wdup++) {
if (wdup->id_iobase != dvp->id_iobase)
continue;
lunit = wdup->id_unit;
if (lunit >= NWD)
continue;
unit = wdup->id_physid;
du = wddrives[lunit] = (struct disk *)
malloc (sizeof(struct disk), M_TEMP, M_NOWAIT);
bzero (du, sizeof(struct disk));
bzero (&wdutab[lunit], sizeof(struct buf));
#ifdef notyet
bzero (&rwdbuf[lunit], sizeof(struct buf));
#endif
wdxfer[lunit] = 0;
du->dk_ctrlr = dvp->id_unit;
du->dk_unit = unit;
du->dk_lunit = lunit;
du->dk_port = dvp->id_iobase;
/* print out description of drive, suppressing multiple blanks*/
if (wdgetctlr(du) == 0) {
int i, blank;
printf(" [%d: wd%d: ", unit, lunit);
for (i = blank = 0 ; i < sizeof(du->dk_params.wdp_model); i++) {
char c = du->dk_params.wdp_model[i];
if (blank && c == ' ')
continue;
if (blank && c != ' ') {
printf(" %c", c);
blank = 0;
continue;
}
if (c == ' ')
blank = 1;
else
printf("%c", c);
}
printf("]");
}
else {
free(du, M_TEMP);
wddrives[unit] = 0;
printf(" [%d: wd%d: not found]", unit, lunit);
}
}
printf("\n");
return(1);
}
/* Read/write routine for a buffer. Finds the proper unit, range checks
* arguments, and schedules the transfer. Does not wait for the transfer
* to complete. Multi-page transfers are supported. All I/O requests must
* be a multiple of a sector in length.
*/
void
wdstrategy(register struct buf *bp)
{
register struct buf *dp;
struct disk *du; /* Disk unit to do the IO. */
int lunit = wdunit(bp->b_dev);
int s;
/* valid unit, controller, and request? */
if (lunit >= NWD || bp->b_blkno < 0 || (du = wddrives[lunit]) == 0) {
bp->b_error = EINVAL;
bp->b_flags |= B_ERROR;
goto done;
}
/* "soft" write protect check */
if ((du->dk_flags & DKFL_WRITEPROT) && (bp->b_flags & B_READ) == 0) {
bp->b_error = EROFS;
bp->b_flags |= B_ERROR;
goto done;
}
/* have partitions and want to use them? */
if ((du->dk_flags & DKFL_BSDLABEL) != 0 && wdpart(bp->b_dev) != WDRAW) {
/*
* do bounds checking, adjust transfer. if error, process.
* if end of partition, just return
*/
if (bounds_check_with_label(bp, &du->dk_dd, du->dk_wlabel) <= 0)
goto done;
/* otherwise, process transfer request */
}
/* queue transfer on drive, activate drive and controller if idle */
dp = &wdutab[lunit];
s = splbio();
disksort(dp, bp);
if (dp->b_active == 0)
wdustart(du); /* start drive */
/* Pick up changes made by readdisklabel(). */
if (du->dk_flags & DKFL_LABELLING && du->dk_state > RECAL) {
wdsleep(du->dk_ctrlr, "wdlab");
du->dk_state = WANTOPEN;
}
if (wdtab[du->dk_ctrlr].b_active == 0)
wdstart(du->dk_ctrlr); /* start controller */
splx(s);
return;
done:
/* toss transfer, we're done early */
biodone(bp);
}
/*
* Routine to queue a command to the controller. The unit's
* request is linked into the active list for the controller.
* If the controller is idle, the transfer is started.
*/
static void
wdustart(register struct disk *du)
{
register struct buf *bp, *dp = &wdutab[du->dk_lunit];
int ctrlr = du->dk_ctrlr;
/* unit already active? */
if (dp->b_active)
return;
/* anything to start? */
bp = dp->b_actf;
if (bp == NULL)
return;
/* link onto controller queue */
dp->b_forw = NULL;
if (wdtab[ctrlr].b_actf == NULL)
wdtab[ctrlr].b_actf = dp;
else
wdtab[ctrlr].b_actl->b_forw = dp;
wdtab[ctrlr].b_actl = dp;
/* mark the drive unit as busy */
dp->b_active = 1;
}
/*
* Controller startup routine. This does the calculation, and starts
* a single-sector read or write operation. Called to start a transfer,
* or from the interrupt routine to continue a multi-sector transfer.
* RESTRICTIONS:
* 1. The transfer length must be an exact multiple of the sector size.
*/
static void
wdstart(int ctrlr)
{
register struct disk *du; /* disk unit for IO */
register struct buf *bp;
struct disklabel *lp;
struct buf *dp;
register struct bt_bad *bt_ptr;
long blknum, cylin, head, sector;
long secpertrk, secpercyl, addr;
int lunit, wdc;
loop:
/* is there a drive for the controller to do a transfer with? */
dp = wdtab[ctrlr].b_actf;
if (dp == NULL)
return;
/* is there a transfer to this drive? */
/* If so, link it on the controller's queue */
bp = dp->b_actf;
if (bp == NULL) {
wdtab[ctrlr].b_actf = dp->b_forw;
goto loop;
}
/* obtain controller and drive information */
lunit = wdunit(bp->b_dev);
du = wddrives[lunit];
wdc = du->dk_port;
/* if not really a transfer, do control operations specially */
if (du->dk_state < OPEN) {
if (du->dk_state != WANTOPEN)
printf("wd%d: wdstart: weird dk_state %d\n",
du->dk_lunit, du->dk_state);
if (wdcontrol(bp) != 0)
printf("wd%d: wdstart: wdcontrol returned nonzero, state = %d\n",
du->dk_lunit, du->dk_state);
return;
}
/* calculate transfer details */
blknum = bp->b_blkno + du->dk_skip;
#ifdef WDDEBUG
if (du->dk_skip == 0)
printf("wd%d: wdstart: %s %d@%d; map ", lunit,
(bp->b_flags & B_READ) ? "read" : "write",
bp->b_bcount, blknum);
else
printf(" %d)%x", du->dk_skip, inb(wdc+wd_altsts));
#endif
addr = (int) bp->b_un.b_addr;
if (du->dk_skip == 0)
du->dk_bc = bp->b_bcount;
lp = &du->dk_dd;
secpertrk = lp->d_nsectors;
secpercyl = lp->d_secpercyl;
if ((du->dk_flags & DKFL_BSDLABEL) != 0 && wdpart(bp->b_dev) != WDRAW)
blknum += lp->d_partitions[wdpart(bp->b_dev)].p_offset;
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
/*
* See if the current block is in the bad block list.
* (If we have one, and not formatting.)
*/
if ((du->dk_flags & (DKFL_SINGLE|DKFL_BADSECT)) /* 19 Aug 92*/
== (DKFL_SINGLE|DKFL_BADSECT))
for (bt_ptr = du->dk_bad.bt_bad; bt_ptr->bt_cyl != 0xffff;
bt_ptr++) {
if (bt_ptr->bt_cyl > cylin)
/* Sorted list, and we passed our cylinder. quit. */
break;
if (bt_ptr->bt_cyl == cylin &&
bt_ptr->bt_trksec == (head << 8) + sector) {
/*
* Found bad block. Calculate new block addr.
* This starts at the end of the disk (skip the
* last track which is used for the bad block list),
* and works backwards to the front of the disk.
*/
#ifdef WDDEBUG
printf("--- badblock code -> Old = %d; ", blknum);
#endif
/*
* XXX the offset of the bad sector table ought
* to be stored in the in-core copy of the table.
*/
#define BAD144_PART 2 /* XXX scattered magic numbers */
#define BSD_PART 0 /* XXX should be 2 but bad144.c uses 0 */
if (lp->d_partitions[BSD_PART].p_offset != 0)
blknum = lp->d_partitions[BAD144_PART].p_offset
+ lp->d_partitions[BAD144_PART].p_size;
else
blknum = lp->d_secperunit;
blknum -= lp->d_nsectors + (bt_ptr - du->dk_bad.bt_bad)
+ 1;
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
#ifdef WDDEBUG
printf("new = %d\n", blknum);
#endif
break;
}
}
wdtab[ctrlr].b_active = 1; /* mark controller active */
/* if starting a multisector transfer, or doing single transfers */
if (du->dk_skip == 0 || (du->dk_flags & DKFL_SINGLE)) {
int command;
u_int count;
if (wdtab[ctrlr].b_errcnt && (bp->b_flags & B_READ) == 0)
du->dk_bc += DEV_BSIZE;
#ifdef B_FORMAT
if (bp->b_flags & B_FORMAT) {
command = WDCC_FORMAT;
count = lp->d_nsectors;
sector = lp->d_gap3 - 1; /* + 1 later */
} else
#endif
{
if (du->dk_flags & DKFL_SINGLE)
count = 1;
else
count = howmany(du->dk_bc, DEV_BSIZE);
command = (bp->b_flags & B_READ) ? WDCC_READ : WDCC_WRITE;
}
/*
* XXX this loop may never terminate. The code to handle
* counting down of retries and eventually failing the i/o is
* in wdintr() and we can't get there from here.
*/
if (wdtest != 0) {
if (--wdtest == 0) {
wdtest = 100;
printf("dummy wdunwedge\n");
wdunwedge(du);
}
}
while (wdcommand(du, cylin, head, sector, count, command) != 0)
{
wderror(bp, du,
"wdstart: timeout waiting to send command");
wdunwedge(du);
}
#ifdef WDDEBUG
printf("sector %d cylin %d head %d addr %x sts %x\n",
sector, cylin, head, addr, inb(wdc+wd_altsts));
#endif
}
/* if this is a read operation, just go away until it's done. */
if (bp->b_flags & B_READ) return;
/* ready to send data? */
if (wdwait(du, WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ) != 0) {
wderror(bp, du, "wdstart: timeout waiting for DRQ");
/*
* XXX what do we do now? If we've just issued the command,
* then we can treat this failure the same as a command
* failure. But if we are continuing a multi-sector write,
* the command was issued ages ago, so we can't simply
* restart it.
*
* XXX we waste a lot of time unnecessarily translating
* block numbers to cylin/head/sector for continued i/o's.
*/
}
/* then send it! */
outsw (wdc + wd_data, (caddr_t)addr + du->dk_skip * DEV_BSIZE,
DEV_BSIZE/sizeof(short));
du->dk_bc -= DEV_BSIZE;
}
/* Interrupt routine for the controller. Acknowledge the interrupt, check for
* errors on the current operation, mark it done if necessary, and start
* the next request. Also check for a partially done transfer, and
* continue with the next chunk if so.
*/
void
wdintr(int unit)
{
register struct disk *du;
register struct buf *bp, *dp;
int wdc;
if (!wdtab[unit].b_active) {
printf("wdc%d: extra interrupt\n", unit);
return;
}
dp = wdtab[unit].b_actf;
bp = dp->b_actf;
du = wddrives[wdunit(bp->b_dev)];
wdc = du->dk_port;
if (wdwait(du, 0) < 0) {
wderror(bp, du, "wdintr: timeout waiting for status");
du->dk_status |= WDCS_ERR; /* XXX */
}
/* is it not a transfer, but a control operation? */
if (du->dk_state < OPEN) {
wdtab[unit].b_active = 0;
if (wdcontrol(bp))
wdstart(unit);
return;
}
/* have we an error? */
if (du->dk_status & (WDCS_ERR | WDCS_ECCCOR)) {
oops:
#ifdef WDDEBUG
wderror(bp, du, "wdintr");
#endif
if((du->dk_flags & DKFL_SINGLE) == 0) {
du->dk_flags |= DKFL_ERROR;
goto outt;
}
#ifdef B_FORMAT
if (bp->b_flags & B_FORMAT) {
bp->b_error = EIO; /* 17 Sep 92*/
bp->b_flags |= B_ERROR;
goto done;
}
#endif
/* error or error correction? */
if (du->dk_status & WDCS_ERR) {
if (++wdtab[unit].b_errcnt < RETRIES) {
wdtab[unit].b_active = 0;
} else {
wderror(bp, du, "hard error");
bp->b_error = EIO; /* 17 Sep 92*/
bp->b_flags |= B_ERROR; /* flag the error */
}
} else
wderror(bp, du, "soft ecc");
}
/*
* If this was a successful read operation, fetch the data.
*/
if (((bp->b_flags & (B_READ | B_ERROR)) == B_READ) && wdtab[unit].b_active) {
int chk, dummy;
chk = min(DEV_BSIZE / sizeof(short), du->dk_bc / sizeof(short));
/* ready to receive data? */
if ((du->dk_status & (WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ))
!= (WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ))
wderror(bp, du, "wdintr: read intr arrived early");
if (wdwait(du, WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ) != 0) {
wderror(bp, du, "wdintr: read error detected late");
goto oops;
}
/* suck in data */
insw (wdc+wd_data,
(caddr_t)bp->b_un.b_addr + du->dk_skip * DEV_BSIZE, chk);
du->dk_bc -= chk * sizeof(short);
/* for obselete fractional sector reads */
while (chk++ < 256) insw (wdc + wd_data, (caddr_t)&dummy, 1);
}
wdxfer[du->dk_lunit]++;
outt:
if (wdtab[unit].b_active) {
if ((bp->b_flags & B_ERROR) == 0) {
du->dk_skip++; /* Add to successful sectors. */
if (wdtab[unit].b_errcnt)
wderror(bp, du, "soft error");
wdtab[unit].b_errcnt = 0;
/* see if more to transfer */
if (du->dk_bc > 0 && (du->dk_flags & DKFL_ERROR) == 0) {
wdtab[unit].b_active = 0;
wdstart(unit);
return; /* next chunk is started */
} else if ((du->dk_flags & (DKFL_SINGLE|DKFL_ERROR))
== DKFL_ERROR) {
du->dk_skip = 0;
du->dk_flags &= ~DKFL_ERROR;
du->dk_flags |= DKFL_SINGLE;
wdtab[unit].b_active = 0;
wdstart(unit);
return; /* redo xfer sector by sector */
}
}
#ifdef B_FORMAT
done: ;
#endif
/* done with this transfer, with or without error */
du->dk_flags &= ~DKFL_SINGLE;
wdtab[unit].b_actf = dp->b_forw;
wdtab[unit].b_errcnt = 0;
du->dk_skip = 0;
dp->b_active = 0;
dp->b_actf = bp->av_forw;
dp->b_errcnt = 0;
bp->b_resid = 0;
biodone(bp);
}
/* controller idle */
wdtab[unit].b_active = 0;
/* anything more on drive queue? */
if (dp->b_actf)
wdustart(du);
/* anything more for controller to do? */
if (wdtab[unit].b_actf)
wdstart(unit);
}
/*
* Initialize a drive.
*/
int
wdopen(dev_t dev, int flags, int fmt, struct proc *p)
{
register unsigned int lunit;
register struct disk *du;
int part = wdpart(dev), mask = 1 << part;
struct partition *pp;
char *msg;
struct disklabel save_label;
lunit = wdunit(dev);
if (lunit >= NWD) return (ENXIO) ;
du = wddrives[lunit];
if (du == 0) return (ENXIO) ;
while (du->dk_flags & DKFL_LABELLING)
tsleep((caddr_t)&du->dk_flags, PZERO - 1, "wdopen", 1);
if ((du->dk_flags & DKFL_BSDLABEL) == 0) {
/*
* wdtab[ctrlr].b_active != 0 implies wdutab[lunit].b_actf == NULL (?)
* so the following guards most things (until the next i/o).
* It doesn't guard against a new i/o starting and being
* affected by the label being changed. Sigh.
*/
wdsleep(du->dk_ctrlr, "wdopn1");
du->dk_flags |= DKFL_LABELLING | DKFL_WRITEPROT;
du->dk_state = WANTOPEN;
wdutab[lunit].b_actf = NULL;
/*
* Read label using WDRAW partition.
*
* If the drive has an MBR, then the current geometry (from
* wdgetctlr()) is used to read it; then the BIOS/DOS
* geometry is inferred and used to read the label off the
* 'c' partition. Otherwise the label is read using the
* current geometry. The label gives the final geometry.
* If bad sector handling is enabled, then this geometry
* is used to read the bad sector table. The geometry
* changes occur inside readdisklabel() and are propagated
* to the driver by resetting the state machine.
*/
save_label = du->dk_dd;
#define WDSTRATEGY ((void (*)(struct buf *)) wdstrategy) /* XXX */
msg = readdisklabel(makewddev(major(dev), lunit, WDRAW),
WDSTRATEGY, &du->dk_dd,
du->dk_dospartitions, &du->dk_bad,
(struct buf **)NULL);
du->dk_flags &= ~DKFL_LABELLING;
if (msg != NULL) {
du->dk_dd = save_label;
log(LOG_WARNING, "wd%d: cannot find label (%s)\n",
lunit, msg);
if (part != WDRAW)
return (EINVAL); /* XXX needs translation */
} else {
du->dk_flags |= DKFL_BSDLABEL;
du->dk_flags &= ~DKFL_WRITEPROT;
if (du->dk_dd.d_flags & D_BADSECT)
du->dk_flags |= DKFL_BADSECT;
}
/* Pick up changes made by readdisklabel(). */
wdsleep(du->dk_ctrlr, "wdopn2");
du->dk_state = WANTOPEN;
}
/*
* Warn if a partion is opened
* that overlaps another partition which is open
* unless one is the "raw" partition (whole disk).
*/
if ((du->dk_openpart & mask) == 0 /*&& part != RAWPART*/ && part != WDRAW) {
int start, end;
pp = &du->dk_dd.d_partitions[part];
start = pp->p_offset;
end = pp->p_offset + pp->p_size;
for (pp = du->dk_dd.d_partitions;
pp < &du->dk_dd.d_partitions[du->dk_dd.d_npartitions];
pp++) {
if (pp->p_offset + pp->p_size <= start ||
pp->p_offset >= end)
continue;
if (pp - du->dk_dd.d_partitions == WDRAW)
continue;
if (du->dk_openpart & (1 << (pp -
du->dk_dd.d_partitions)))
log(LOG_WARNING,
"wd%d%c: overlaps open partition (%c)\n",
lunit, part + 'a',
pp - du->dk_dd.d_partitions + 'a');
}
}
if (part >= du->dk_dd.d_npartitions && part != WDRAW)
return (ENXIO);
/* insure only one open at a time */
du->dk_openpart |= mask;
switch (fmt) {
case S_IFCHR:
du->dk_copenpart |= mask;
break;
case S_IFBLK:
du->dk_bopenpart |= mask;
break;
}
return (0);
}
/*
* Implement operations other than read/write.
* Called from wdstart or wdintr during opens and formats.
* Uses finite-state-machine to track progress of operation in progress.
* Returns 0 if operation still in progress, 1 if completed.
*/
static int
wdcontrol(register struct buf *bp)
{
register struct disk *du;
int ctrlr;
du = wddrives[wdunit(bp->b_dev)];
ctrlr = du->dk_ctrlr;
switch (du->dk_state) {
case WANTOPEN:
tryagainrecal:
wdtab[ctrlr].b_active = 1;
if (wdcommand(du, 0, 0, 0, 0, WDCC_RESTORE | WD_STEP) != 0) {
wderror(bp, du, "wdcontrol: wdcommand failed");
goto maybe_retry;
}
du->dk_state = RECAL;
return(0);
case RECAL:
if (du->dk_status & WDCS_ERR || wdsetctlr(du) != 0) {
wderror(bp, du, "wdcontrol: recal failed");
maybe_retry:
if (du->dk_status & WDCS_ERR)
wdunwedge(du);
if (++wdtab[ctrlr].b_errcnt < RETRIES) {
du->dk_state = WANTOPEN;
goto tryagainrecal;
}
bp->b_error = ENXIO; /* XXX needs translation */
bp->b_flags |= B_ERROR;
return(1);
}
wdtab[ctrlr].b_errcnt = 0;
du->dk_state = OPEN;
/*
* The rest of the initialization can be done
* by normal means.
*/
return(1);
}
panic("wdcontrol");
return (1);
}
/*
* Wait uninterruptibly until controller is not busy, then send it a command.
* The wait usually terminates immediately because we waited for the previous
* command to terminate.
*/
static int
wdcommand(struct disk *du, u_int cylinder, u_int head, u_int sector,
u_int count, u_int command)
{
u_int wdc;
if (wdwait(du, 0) < 0)
return (1);
wdc = du->dk_port;
outb(wdc + wd_precomp, du->dk_dd.d_precompcyl / 4);
outb(wdc + wd_cyl_lo, cylinder);
outb(wdc + wd_cyl_hi, cylinder >> 8);
outb(wdc + wd_sdh, WDSD_IBM | (du->dk_unit << 4) | (head & 0x0f));
DELAY(10); /* XXX give drive time to see change */
if((command != WDCC_DIAGNOSE) && (command != WDCC_IDC)) {
if (wdwait(du, WDCS_READY) < 0) {
return(1);
}
}
else {
if (wdwait(du, 0) < 0) {
return(1);
}
}
outb(wdc + wd_sector, sector + 1);
outb(wdc + wd_seccnt, count);
outb(du->dk_port + wd_command, command);
return (0);
}
/*
* issue IDC to drive to tell it just what geometry it is to be.
*/
static int
wdsetctlr(struct disk *du)
{
#ifdef WDDEBUG
printf("wd(%d,%d): wdsetctlr C %lu H %lu S %lu\n", du->dk_ctrlr, du->dk_unit,
du->dk_dd.d_ncylinders, du->dk_dd.d_ntracks,
du->dk_dd.d_nsectors);
#endif
if (wdcommand(du, du->dk_dd.d_ncylinders, du->dk_dd.d_ntracks - 1, 0,
du->dk_dd.d_nsectors, WDCC_IDC) != 0
|| wdwait(du, WDCS_READY) != 0) {
wderror((struct buf *)NULL, du, "wdsetctlr failed");
return (1);
}
return (0);
}
/*
* Wait until driver is inactive, then set up controller.
*/
static int
wdwsetctlr(struct disk *du)
{
int stat;
int x;
wdsleep(du->dk_ctrlr, "wdwset");
x = splbio();
stat = wdsetctlr(du);
splx(x);
return (stat);
}
/*
* issue READP to drive to ask it what it is.
*/
static int
wdgetctlr(struct disk *du) {
int i;
char tb[DEV_BSIZE];
struct wdparams *wp;
if (wdcommand(du, 0, 0, 0, 0, WDCC_READP) != 0
|| wdwait(du, WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ) != 0) {
#ifndef MFM
/* Old drives don't support WDCC_READP. Try a seek to 0. */
if (wdcommand(du, 0, 0, 0, 0, WDCC_RESTORE | WD_STEP) != 0
|| wdwait(du, WDCS_READY | WDCS_SEEKCMPLT) != 0)
return (1);
#else /* IDE */
/*
* Some IDE drives return trash if there is not a unit 1
* out there, need to make sure that it is READY and not BUSY
* before you assume it is there !
*/
outb(du->dk_port+wd_sdh, WDSD_IBM | (du->dk_unit<<4));
DELAY(5000);
if ((inb(du->dk_port+wd_status) & (WDCS_READY|WDCS_BUSY)) !=
WDCS_READY) {
return (1);
}
#endif /* MFM */
/* Fake minimal drive geometry for reading the MBR or label. */
du->dk_dd.d_secsize = DEV_BSIZE;
du->dk_dd.d_nsectors = 17;
du->dk_dd.d_ntracks = 1;
du->dk_dd.d_ncylinders = 1;
du->dk_dd.d_secpercyl = 17;
/*
* Fake some more of the label for printing by disklabel(1)
* in case there is no real label.
*/
du->dk_dd.d_type = DTYPE_ST506;
du->dk_dd.d_subtype |= DSTYPE_GEOMETRY;
strncpy(du->dk_dd.d_typename, "Fake geometry",
sizeof du->dk_dd.d_typename);
/* Fake the model name for printing by wdattach(). */
strncpy(du->dk_params.wdp_model, "Unknown Type",
sizeof du->dk_params.wdp_model);
return (0);
}
/* obtain parameters */
wp = &du->dk_params;
insw(du->dk_port + wd_data, tb, sizeof(tb)/sizeof(short));
bcopy(tb, wp, sizeof(struct wdparams));
/* shuffle string byte order */
for (i=0; i < sizeof(wp->wdp_model) ;i+=2) {
u_short *p;
p = (u_short *) (wp->wdp_model + i);
*p = ntohs(*p);
}
#ifdef WDDEBUG
printf(
"\nwdgetctlr wd(%d,%d): gc %x cyl %d trk %d sec %d type %d sz %d model %s\n",
du->dk_ctrlr, du->dk_unit, wp->wdp_config,
wp->wdp_fixedcyl + wp->wdp_removcyl, wp->wdp_heads,
wp->wdp_sectors, wp->wdp_cntype, wp->wdp_cnsbsz,
wp->wdp_model);
#endif
/* update disklabel given drive information */
du->dk_dd.d_secsize = DEV_BSIZE;
du->dk_dd.d_ncylinders = wp->wdp_fixedcyl + wp->wdp_removcyl /*+- 1*/;
du->dk_dd.d_ntracks = wp->wdp_heads;
du->dk_dd.d_nsectors = wp->wdp_sectors;
du->dk_dd.d_secpercyl = du->dk_dd.d_ntracks * du->dk_dd.d_nsectors;
/* dubious ... */
bcopy("ESDI/IDE", du->dk_dd.d_typename, 9);
bcopy(wp->wdp_model+20, du->dk_dd.d_packname, 14-1);
/* better ... */
du->dk_dd.d_type = DTYPE_ESDI;
du->dk_dd.d_subtype |= DSTYPE_GEOMETRY;
return (0);
}
/* ARGSUSED */
int
wdclose(dev_t dev, int flags, int fmt)
{
register struct disk *du;
int part = wdpart(dev), mask = 1 << part;
du = wddrives[wdunit(dev)];
/* insure only one open at a time */
du->dk_openpart &= ~mask;
switch (fmt) {
case S_IFCHR:
du->dk_copenpart &= ~mask;
break;
case S_IFBLK:
du->dk_bopenpart &= ~mask;
break;
}
return(0);
}
int
wdioctl(dev_t dev, int cmd, caddr_t addr, int flag)
{
int lunit = wdunit(dev);
register struct disk *du;
int error = 0;
#ifdef notyet
struct uio auio;
struct iovec aiov;
#endif
du = wddrives[lunit];
switch (cmd) {
case DIOCSBAD:
if ((flag & FWRITE) == 0)
error = EBADF;
else
du->dk_bad = *(struct dkbad *)addr;
break;
case DIOCGDINFO:
*(struct disklabel *)addr = du->dk_dd;
break;
case DIOCGPART:
((struct partinfo *)addr)->disklab = &du->dk_dd;
((struct partinfo *)addr)->part =
&du->dk_dd.d_partitions[wdpart(dev)];
break;
case DIOCSDINFO:
if ((flag & FWRITE) == 0)
error = EBADF;
else
error = setdisklabel(&du->dk_dd,
(struct disklabel *)addr,
/* du->dk_flags & DKFL_BSDLABEL) ? du->dk_openpart : */0,
du->dk_dospartitions);
if (error == 0) {
du->dk_flags |= DKFL_BSDLABEL;
wdwsetctlr(du); /* XXX - check */
}
break;
case DIOCWLABEL:
du->dk_flags &= ~DKFL_WRITEPROT;
if ((flag & FWRITE) == 0)
error = EBADF;
else
du->dk_wlabel = *(int *)addr;
break;
case DIOCWDINFO:
du->dk_flags &= ~DKFL_WRITEPROT;
if ((flag & FWRITE) == 0)
error = EBADF;
else if ((error = setdisklabel(&du->dk_dd, (struct disklabel *)addr,
/*du->dk_flags & DKFL_BSDLABEL) ? du->dk_openpart :*/ 0,
du->dk_dospartitions)) == 0) {
int wlab;
du->dk_flags |= DKFL_BSDLABEL;
wdwsetctlr(du); /* XXX - check */
/* simulate opening partition 0 so write succeeds */
du->dk_openpart |= (1 << 0); /* XXX */
wlab = du->dk_wlabel;
du->dk_wlabel = 1;
error = writedisklabel(dev, WDSTRATEGY,
&du->dk_dd, du->dk_dospartitions);
du->dk_openpart = du->dk_copenpart | du->dk_bopenpart;
du->dk_wlabel = wlab;
}
break;
#ifdef notyet
case DIOCGDINFOP:
*(struct disklabel **)addr = &(du->dk_dd);
break;
case DIOCWFORMAT:
if ((flag & FWRITE) == 0)
error = EBADF;
else {
register struct format_op *fop;
fop = (struct format_op *)addr;
aiov.iov_base = fop->df_buf;
aiov.iov_len = fop->df_count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_resid = fop->df_count;
auio.uio_segflg = 0;
auio.uio_offset =
fop->df_startblk * du->dk_dd.d_secsize;
error = physio(wdformat, &rwdbuf[lunit], 0, dev, B_WRITE,
minphys, &auio);
fop->df_count -= auio.uio_resid;
fop->df_reg[0] = du->dk_status;
fop->df_reg[1] = du->dk_error;
}
break;
#endif
default:
error = ENOTTY;
break;
}
return (error);
}
#ifdef B_FORMAT
int
wdformat(struct buf *bp)
{
bp->b_flags |= B_FORMAT;
return (wdstrategy(bp));
}
#endif
int
wdsize(dev_t dev)
{
int lunit = wdunit(dev), part = wdpart(dev), val;
struct disk *du;
if (lunit >= NWD) /* 31 Jul 92*/
return(-1);
du = wddrives[lunit];
val = 0;
if (du == 0 || du->dk_state == CLOSED)
val = wdopen (makewddev(major(dev), lunit, WDRAW), FREAD, S_IFBLK, 0);
if (du == 0 || val != 0 || du->dk_flags & DKFL_WRITEPROT)
return (-1);
return((int)du->dk_dd.d_partitions[part].p_size);
}
extern char *vmmap; /* poor name! */
int
wddump(dev_t dev) /* dump core after a system crash */
{
register struct disk *du; /* disk unit to do the IO */
#ifdef notyet
register struct bt_bad *bt_ptr;
#endif
long num; /* number of sectors to write */
int ctrlr, lunit, part, wdc;
long blkoff, blknum;
#ifdef notdef
long blkcnt;
#endif
long cylin, head, sector;
long secpertrk, secpercyl, nblocks, i;
char *addr;
extern int Maxmem;
static wddoingadump = 0 ;
extern caddr_t CADDR1;
addr = (char *) 0; /* starting address */
/* toss any characters present prior to dump */
while (sgetc(1))
;
/* size of memory to dump */
num = Maxmem;
lunit = wdunit(dev); /* eventually support floppies? */
part = wdpart(dev); /* file system */
/* check for acceptable drive number */
if (lunit >= NWD) return(ENXIO); /* 31 Jul 92*/
du = wddrives[lunit];
if (du == 0) return(ENXIO);
/* was it ever initialized ? */
if (du->dk_state < OPEN) return (ENXIO) ;
if (du->dk_flags & DKFL_WRITEPROT) return(ENXIO);
wdc = du->dk_port;
ctrlr = du->dk_ctrlr;
/* Convert to disk sectors */
num = (u_long) num * NBPG / du->dk_dd.d_secsize;
/* check if controller active */
/*if (wdtab[ctrlr].b_active) return(EFAULT); */
if (wddoingadump) return(EFAULT);
secpertrk = du->dk_dd.d_nsectors;
secpercyl = du->dk_dd.d_secpercyl;
nblocks = du->dk_dd.d_partitions[part].p_size;
blkoff = du->dk_dd.d_partitions[part].p_offset;
/*pg("xunit %x, nblocks %d, dumplo %d num %d\n", part,nblocks,dumplo,num);*/
/* check transfer bounds against partition size */
if ((dumplo < 0) || ((dumplo + num) > nblocks))
return(EINVAL);
#if 0
wdtab[ctrlr].b_active = 1; /* mark controller active for if we */
/* panic during the dump */
#endif
wddoingadump = 1 ;
i = 100000; /* WHY NOT TIMEOUT */
/* must delay 5us to conform to ATA spec */
DELAY(5);
while ((inb(wdc+wd_status) & WDCS_BUSY) && (i-- > 0)) ;
outb(wdc+wd_sdh, WDSD_IBM | (du->dk_unit << 4));
outb(wdc+wd_command, WDCC_RESTORE | WD_STEP);
/* must delay 5us to conform to ATA spec */
DELAY(5);
while (inb(wdc+wd_status) & WDCS_BUSY) ;
/* some compaq controllers require this ... */
wdsetctlr(du);
blknum = dumplo + blkoff;
while (num > 0) {
#ifdef notdef
if (blkcnt > MAXTRANSFER) blkcnt = MAXTRANSFER;
if ((blknum + blkcnt - 1) / secpercyl != blknum / secpercyl)
blkcnt = secpercyl - (blknum % secpercyl);
/* keep transfer within current cylinder */
#endif
pmap_enter(kernel_pmap, (vm_offset_t)CADDR1,
trunc_page(addr), VM_PROT_READ, TRUE);
/* compute disk address */
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
#ifdef notyet
/*
* See if the current block is in the bad block list.
* (If we have one.)
*/
for (bt_ptr = du->dk_bad.bt_bad;
bt_ptr->bt_cyl != -1; bt_ptr++) {
if (bt_ptr->bt_cyl > cylin)
/* Sorted list, and we passed our cylinder.
quit. */
break;
if (bt_ptr->bt_cyl == cylin &&
bt_ptr->bt_trksec == (head << 8) + sector) {
/*
* Found bad block. Calculate new block addr.
* This starts at the end of the disk (skip the
* last track which is used for the bad block list),
* and works backwards to the front of the disk.
*/
/* XXX as usual */
if (lp->d_partitions[BSD_PART].p_offset != 0)
blknum = lp->d_partitions[BAD144_PART]
.p_offset
+ lp->d_partitions[BAD144_PART]
.p_size;
else
blknum = lp->d_secperunit;
blknum -= du->dk_dd.d_nsectors
+ (bt_ptr - du->dk_bad.bt_bad) + 1;
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
break;
}
}
#endif
sector++; /* origin 1 */
/* select drive. */
outb(wdc+wd_sdh, WDSD_IBM | (du->dk_unit<<4) | (head & 0xf));
while ((inb(wdc+wd_status) & WDCS_READY) == 0) ;
/* transfer some blocks */
outb(wdc+wd_sector, sector);
outb(wdc+wd_seccnt,1);
outb(wdc+wd_cyl_lo, cylin);
outb(wdc+wd_cyl_hi, cylin >> 8);
#ifdef notdef
/* lets just talk about this first...*/
pg ("sdh 0%o sector %d cyl %d addr 0x%x",
inb(wdc+wd_sdh), inb(wdc+wd_sector),
inb(wdc+wd_cyl_hi)*256+inb(wdc+wd_cyl_lo), addr) ;
#endif
outb(wdc+wd_command, WDCC_WRITE);
/* Ready to send data? */
while ((inb(wdc+wd_status) & WDCS_DRQ) == 0) ;
if (inb(wdc+wd_status) & WDCS_ERR) return(EIO) ;
outsw (wdc+wd_data, CADDR1+((int)addr&(NBPG-1)), 256);
if (inb(wdc+wd_status) & WDCS_ERR) return(EIO) ;
/* Check data request (should be done) */
if (inb(wdc+wd_status) & WDCS_DRQ) return(EIO) ;
/* wait for completion */
/* must delay 5us to conform to ATA spec */
DELAY(5);
for ( i = WDCTIMEOUT ; inb(wdc+wd_status) & WDCS_BUSY ; i--) {
if (i < 0) return (EIO) ;
}
/* error check the xfer */
if (inb(wdc+wd_status) & WDCS_ERR) return(EIO) ;
if ((unsigned)addr % (1024*1024) == 0) printf("%ld ", num/2048);
/* update block count */
num--;
blknum++ ;
(int) addr += 512;
/* operator aborting dump? */
if (sgetc(1))
return(EINTR);
}
return(0);
}
static void
wderror(struct buf *bp, struct disk *du, char *mesg)
{
if (bp == NULL)
printf("wd%d: %s:", du->dk_lunit, mesg);
else
diskerr(bp, "wd", mesg, LOG_PRINTF, du->dk_skip, &du->dk_dd);
printf(" status %b error %b\n",
du->dk_status, WDCS_BITS, du->dk_error, WDERR_BITS);
}
/*
* Reset the controller.
*/
static int
wdreset(struct disk *du)
{
int wdc;
wdc = du->dk_port;
(void)wdwait(du, 0);
outb(wdc + wd_ctlr, WDCTL_IDS | WDCTL_RST);
DELAY(10 * 1000);
outb(wdc + wd_ctlr, WDCTL_IDS);
if (wdwait(du, WDCS_READY | WDCS_SEEKCMPLT) != 0
|| (du->dk_error = inb(wdc + wd_error)) != 0x01)
return (1);
outb(wdc + wd_ctlr, WDCTL_4BIT);
return (0);
}
/*
* Sleep until driver is inactive.
* This is used only for avoiding rare race conditions, so it is unimportant
* that the sleep may be far too short or too long.
*/
static void
wdsleep(int ctrlr, char *wmesg)
{
while (wdtab[ctrlr].b_active)
tsleep((caddr_t)&wdtab[ctrlr].b_active, PZERO - 1, wmesg, 1);
}
/*
* Reset the controller after it has become wedged. This is different from
* wdreset() so that wdreset() can be used in the probe and so that this
* can restore the geometry .
*/
static int
wdunwedge(struct disk *du)
{
struct disk *du1;
int lunit;
/* Schedule other drives for recalibration. */
for (lunit = 0; lunit < NWD; lunit++)
if ((du1 = wddrives[lunit]) != NULL && du1 != du
&& du1->dk_ctrlr == du->dk_ctrlr
&& du1->dk_state > WANTOPEN)
du1->dk_state = WANTOPEN;
DELAY(RECOVERYTIME);
if (wdreset(du) == 0) {
/*
* XXX - recalibrate current drive now because some callers
* aren't prepared to have its state change.
*/
if (wdcommand(du, 0, 0, 0, 0, WDCC_RESTORE | WD_STEP) == 0
&& wdwait(du, WDCS_READY | WDCS_SEEKCMPLT) == 0
&& wdsetctlr(du) == 0)
return (0);
}
wderror((struct buf *)NULL, du, "wdunwedge failed");
return (1);
}
/*
* Wait uninterruptibly until controller is not busy and either certain
* status bits are set or an error has occurred.
* The wait is usually short unless it is for the controller to process
* an entire critical command.
* Return 1 for (possibly stale) controller errors, -1 for timeout errors,
* or 0 for no errors.
* Return controller status in du->dk_status and, if there was a controller
* error, return the error code in du->dk_error.
*/
static int min_retries[NWDC];
static int
wdwait(struct disk *du, u_char bits_wanted)
{
int retries;
int wdc;
int ctrlr = du->dk_ctrlr;
u_char status;
#define POLLING 1000
#define TIMEOUT 20000 /* WDCC_DIAGNOSE can take > 300 msec */
wdc = du->dk_port;
retries = POLLING + TIMEOUT;
do {
if (min_retries[ctrlr] > retries || min_retries[ctrlr] == 0)
min_retries[ctrlr] = retries;
/* must delay 5us to conform to ATA spec */
DELAY(5);
du->dk_status = status = inb(wdc + wd_status);
if (!(status & WDCS_BUSY)) {
if (status & WDCS_ERR) {
du->dk_error = inb(wdc + wd_error);
/*
* We once returned here. This is wrong
* because the error bit is apparently only
* valid after the controller has interrupted
* (e.g., the error bit is stale when we wait
* for DRQ for writes). So we can't depend
* on the error bit at all when polling for
* command completion.
*/
}
if ((status & bits_wanted) == bits_wanted)
return (status & WDCS_ERR);
}
if (retries < TIMEOUT)
/*
* Switch to a polling rate of about 1 KHz so that
* the timeout is almost machine-independent. The
* controller is taking a long time to respond, so
* an extra msec won't matter.
*/
DELAY(1000);
} while (--retries != 0);
return (-1);
}
#endif /* NWDC > 0 */
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