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freebsd-dev/sys/i386/isa/wd.c
Bruce Evans 7b17f8ffbd Don't permit generation of non-physical disk addresses. 
subr_diskmbr.c:
Don't "helpfully" enlarge our idea of the disk size to cover all the
primary slices.  Instead, truncate or discard slices that don't seem
to be on the disk.  The enlargement was a hack for disks that don't
report their size (e.g., MFM disks).  It is just wrong in general.

wd.c:
In CHS mode, limit the disk size so that cylinder numbers >= 65536
cannot occur.  This normally only affects disks larger than 33.8GB.
CHS mode accesses to addresses above the limit are now properly broken
(an error is returned instead of garbage for reads and disk corruption
for writes).

PR:		15611
Reviewed by:	readers of freebsd-bugs did not respond to a request
            	for review
2000-01-28 10:22:07 +00:00

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/*-
* 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: @(#)wd.c 7.2 (Berkeley) 5/9/91
* $FreeBSD$
*/
/* TODO:
* o Bump error count after timeout.
* o Satisfy ATA timing in all cases.
* o Finish merging berry/sos timeout code (bump error count...).
* o Don't use polling except for initialization. Need to
* reorganize the state machine. Then "extra" interrupts
* shouldn't happen (except maybe one for initialization).
* o Support extended DOS partitions.
* o Support swapping to DOS partitions.
* o Handle clustering, disklabelling, DOS
* partitions and swapping driver-independently.
* Swapping will need new
* driver entries for polled reinit and polled write).
*/
#include "wd.h"
#ifdef NWDC
#undef NWDC
#endif
#include "wdc.h"
#if NWDC > 0
#include "opt_hw_wdog.h"
#include "opt_ide_delay.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/disklabel.h>
#include <sys/diskslice.h>
#include <sys/buf.h>
#include <sys/devicestat.h>
#include <sys/malloc.h>
#include <sys/cons.h>
#include <machine/bootinfo.h>
#include <machine/clock.h>
#include <machine/md_var.h>
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/wdreg.h>
#include <sys/syslog.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <i386/isa/atapi.h>
extern void wdstart(int ctrlr);
#ifdef IDE_DELAY
#define TIMEOUT IDE_DELAY
#else
#define TIMEOUT 10000
#endif
#define RETRIES 5 /* number of retries before giving up */
#define RECOVERYTIME 500000 /* usec for controller to recover after err */
#define MAXTRANSFER 255 /* max size of transfer in sectors */
/* correct max is 256 but some controllers */
/* can't handle that in all cases */
#define WDOPT_32BIT 0x8000
#define WDOPT_SLEEPHACK 0x4000
#define WDOPT_DMA 0x2000
#define WDOPT_LBA 0x1000
#define WDOPT_FORCEHD(x) (((x)&0x0f00)>>8)
#define WDOPT_MULTIMASK 0x00ff
/*
* 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 */
#define PRIMARY 0
/*
* Disk geometry. A small part of struct disklabel.
* XXX disklabel.5 contains an old clone of disklabel.h.
*/
struct diskgeom {
u_long d_secsize; /* # of bytes per sector */
u_long d_nsectors; /* # of data sectors per track */
u_long d_ntracks; /* # of tracks per cylinder */
u_long d_ncylinders; /* # of data cylinders per unit */
u_long d_secpercyl; /* # of data sectors per cylinder */
u_long d_secperunit; /* # of data sectors per unit */
u_long d_precompcyl; /* XXX always 0 */
};
/*
* The structure of a disk drive.
*/
struct disk {
u_int dk_bc; /* byte count left */
short dk_skip; /* blocks already transferred */
int dk_ctrlr; /* physical controller number */
int dk_ctrlr_cmd640;/* controller number for CMD640 quirk */
u_int32_t dk_unit; /* physical unit number */
u_int32_t dk_lunit; /* logical unit number */
u_int32_t dk_interface; /* interface (two ctrlrs per interface) */
char dk_state; /* control state */
u_char dk_status; /* copy of status reg. */
u_char dk_error; /* copy of error reg. */
u_char dk_timeout; /* countdown to next timeout */
u_int32_t dk_port; /* i/o port base */
u_int32_t dk_altport; /* altstatus port base */
u_long cfg_flags; /* configured characteristics */
short dk_flags; /* drive characteristics found */
#define DKFL_SINGLE 0x00004 /* sector at a time mode */
#define DKFL_ERROR 0x00008 /* processing a disk error */
#define DKFL_LABELLING 0x00080 /* readdisklabel() in progress */
#define DKFL_32BIT 0x00100 /* use 32-bit i/o mode */
#define DKFL_MULTI 0x00200 /* use multi-i/o mode */
#define DKFL_USEDMA 0x00800 /* use DMA for data transfers */
#define DKFL_DMA 0x01000 /* using DMA on this transfer-- DKFL_SINGLE
* overrides this
*/
#define DKFL_LBA 0x02000 /* use LBA for data transfers */
struct wdparams dk_params; /* ESDI/IDE drive/controller parameters */
unsigned int dk_multi; /* multi transfers */
int dk_currentiosize; /* current io size */
struct diskgeom dk_dd; /* device configuration data */
struct diskslices *dk_slices; /* virtual drives */
void *dk_dmacookie; /* handle for DMA services */
struct devstat dk_stats; /* devstat entry */
};
#define WD_COUNT_RETRIES
static int wdtest = 0;
static struct disk *wddrives[NWD]; /* table of units */
static struct buf_queue_head drive_queue[NWD]; /* head of queue per drive */
static struct {
int b_active;
} wdutab[NWD];
/*
static struct buf wdtab[NWDC];
*/
static struct {
struct buf_queue_head controller_queue;
int b_errcnt;
int b_active;
} wdtab[NWDC];
struct wddma wddma[NWDC];
#ifdef notyet
static struct buf rwdbuf[NWD]; /* buffers for raw IO */
#endif
static int wdprobe(struct isa_device *dvp);
static int wdattach(struct isa_device *dvp);
static void wdustart(struct disk *du);
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);
#if 0
static int wdwsetctlr(struct disk *du);
#endif
static int wdsetmode(int mode, void *wdinfo);
static int wdgetctlr(struct disk *du);
static void wderror(struct buf *bp, struct disk *du, char *mesg);
static void wdflushirq(struct disk *du, int old_ipl);
static int wdreset(struct disk *du);
static void wdsleep(int ctrlr, char *wmesg);
static timeout_t wdtimeout;
static int wdunwedge(struct disk *du);
static int wdwait(struct disk *du, u_char bits_wanted, int timeout);
struct isa_driver wdcdriver = {
wdprobe, wdattach, "wdc",
};
static d_open_t wdopen;
static d_close_t wdclose;
static d_strategy_t wdstrategy;
static d_ioctl_t wdioctl;
static d_dump_t wddump;
static d_psize_t wdsize;
#define CDEV_MAJOR 3
#define BDEV_MAJOR 0
static struct cdevsw wd_cdevsw = {
/* open */ wdopen,
/* close */ wdclose,
/* read */ physread,
/* write */ physwrite,
/* ioctl */ wdioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ wdstrategy,
/* name */ "wd",
/* maj */ CDEV_MAJOR,
/* dump */ wddump,
/* psize */ wdsize,
/* flags */ D_DISK,
/* bmaj */ BDEV_MAJOR
};
static int atapictrlr;
static int eide_quirks;
/*
* Here we use the pci-subsystem to find out, whether there is
* a cmd640b-chip attached on this pci-bus. This public routine
* will be called by ide_pci.c
*/
void
wdc_pci(int quirks)
{
eide_quirks = quirks;
}
/*
* Probe for controller.
*/
static int
wdprobe(struct isa_device *dvp)
{
int unit = dvp->id_unit;
int interface;
struct disk *du;
if (unit >= NWDC)
return (0);
du = malloc(sizeof *du, M_TEMP, M_NOWAIT);
if (du == NULL)
return (0);
bzero(du, sizeof *du);
du->dk_ctrlr = dvp->id_unit;
interface = du->dk_ctrlr / 2;
du->dk_interface = interface;
du->dk_port = dvp->id_iobase;
if (wddma[interface].wdd_candma != NULL) {
du->dk_dmacookie =
wddma[interface].wdd_candma(dvp->id_iobase, du->dk_ctrlr,
du->dk_unit);
du->dk_altport =
wddma[interface].wdd_altiobase(du->dk_dmacookie);
}
if (du->dk_altport == 0)
du->dk_altport = du->dk_port + wd_ctlr;
/* check if we have registers that work */
outb(du->dk_port + wd_sdh, WDSD_IBM); /* set unit 0 */
outb(du->dk_port + wd_cyl_lo, 0xa5); /* wd_cyl_lo is read/write */
if (inb(du->dk_port + wd_cyl_lo) == 0xff) { /* XXX too weak */
/* There is no master, try the ATAPI slave. */
du->dk_unit = 1;
outb(du->dk_port + wd_sdh, WDSD_IBM | 0x10);
outb(du->dk_port + wd_cyl_lo, 0xa5);
if (inb(du->dk_port + wd_cyl_lo) == 0xff)
goto nodevice;
}
if (wdreset(du) == 0)
goto reset_ok;
/* test for ATAPI signature */
outb(du->dk_port + wd_sdh, WDSD_IBM); /* master */
if (inb(du->dk_port + wd_cyl_lo) == 0x14 &&
inb(du->dk_port + wd_cyl_hi) == 0xeb)
goto reset_ok;
du->dk_unit = 1;
outb(du->dk_port + wd_sdh, WDSD_IBM | 0x10); /* slave */
if (inb(du->dk_port + wd_cyl_lo) == 0x14 &&
inb(du->dk_port + wd_cyl_hi) == 0xeb)
goto reset_ok;
DELAY(RECOVERYTIME);
if (wdreset(du) != 0) {
goto nodevice;
}
reset_ok:
/* execute a controller only command */
if (wdcommand(du, 0, 0, 0, 0, WDCC_DIAGNOSE) != 0
|| wdwait(du, 0, TIMEOUT) < 0) {
goto nodevice;
}
/*
* drive(s) did not time out during diagnostic :
* Get error status and check that both drives are OK.
* Table 9-2 of ATA specs suggests that we must check for
* a value of 0x01
*
* Strangely, some controllers will return a status of
* 0x81 (drive 0 OK, drive 1 failure), and then when
* the DRV bit is set, return status of 0x01 (OK) for
* drive 2. (This seems to contradict the ATA spec.)
*/
du->dk_error = inb(du->dk_port + wd_error);
if(du->dk_error != 0x01 && du->dk_error != 0) {
if(du->dk_error & 0x80) { /* drive 1 failure */
/* first set the DRV bit */
u_int sdh;
sdh = inb(du->dk_port+ wd_sdh);
sdh = sdh | 0x10;
outb(du->dk_port+ wd_sdh, sdh);
/* Wait, to make sure drv 1 has completed diags */
if ( wdwait(du, 0, TIMEOUT) < 0)
goto nodevice;
/* Get status for drive 1 */
du->dk_error = inb(du->dk_port + wd_error);
/* printf("Error (drv 1) : %x\n", du->dk_error); */
/*
* Sometimes (apparently mostly with ATAPI
* drives involved) 0x81 really means 0x81
* (drive 0 OK, drive 1 failed).
*/
if(du->dk_error != 0x01 && du->dk_error != 0x81)
goto nodevice;
} else /* drive 0 fail */
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, flags, i;
struct disk *du;
struct wdparams *wp;
static char buf[] = "wdcXXX";
static int once;
dvp->id_intr = wdintr;
if (dvp->id_unit >= NWDC)
return (0);
if (!once) {
cdevsw_add(&wd_cdevsw);
once++;
}
if (eide_quirks & Q_CMD640B) {
if (dvp->id_unit == PRIMARY) {
printf("wdc0: CMD640B workaround enabled\n");
bufq_init(&wdtab[PRIMARY].controller_queue);
}
} else
bufq_init(&wdtab[dvp->id_unit].controller_queue);
sprintf(buf, "wdc%d", dvp->id_unit);
for (i = resource_query_string(-1, "at", buf);
i != -1;
i = resource_query_string(i, "at", buf)) {
if (strcmp(resource_query_name(i), "wd"))
/* Avoid a bit of foot shooting. */
continue;
lunit = resource_query_unit(i);
if (lunit >= NWD)
continue;
if (resource_int_value("wd", lunit, "drive", &unit) != 0)
continue;
if (resource_int_value("wd", lunit, "flags", &flags) != 0)
flags = 0;
du = malloc(sizeof *du, M_TEMP, M_NOWAIT);
if (du == NULL)
continue;
if (wddrives[lunit] != NULL)
panic("drive attached twice");
wddrives[lunit] = du;
bufq_init(&drive_queue[lunit]);
bzero(du, sizeof *du);
du->dk_ctrlr = dvp->id_unit;
if (eide_quirks & Q_CMD640B) {
du->dk_ctrlr_cmd640 = PRIMARY;
} else {
du->dk_ctrlr_cmd640 = du->dk_ctrlr;
}
du->dk_unit = unit;
du->dk_lunit = lunit;
du->dk_port = dvp->id_iobase;
du->dk_altport = du->dk_port + wd_ctlr;
/*
* Use the individual device flags or the controller
* flags.
*/
du->cfg_flags = flags |
((dvp->id_flags) >> (16 * unit));
if (wdgetctlr(du) == 0) {
/*
* Print out description of drive.
* wdp_model may not be null terminated.
*/
printf("wdc%d: unit %d (wd%d): <%.*s>",
dvp->id_unit, unit, lunit,
(int)sizeof(du->dk_params.wdp_model),
du->dk_params.wdp_model);
if (du->dk_flags & DKFL_LBA)
printf(", LBA");
if (du->dk_flags & DKFL_USEDMA)
printf(", DMA");
if (du->dk_flags & DKFL_32BIT)
printf(", 32-bit");
if (du->dk_multi > 1)
printf(", multi-block-%d", du->dk_multi);
if (du->cfg_flags & WDOPT_SLEEPHACK)
printf(", sleep-hack");
printf("\n");
if (du->dk_params.wdp_heads == 0)
printf("wd%d: size unknown, using %s values\n",
lunit, du->dk_dd.d_secperunit > 17
? "BIOS" : "fake");
printf( "wd%d: %luMB (%lu sectors), "
"%lu cyls, %lu heads, %lu S/T, %lu B/S\n",
lunit,
du->dk_dd.d_secperunit
/ ((1024L * 1024L) / du->dk_dd.d_secsize),
du->dk_dd.d_secperunit,
du->dk_dd.d_ncylinders,
du->dk_dd.d_ntracks,
du->dk_dd.d_nsectors,
du->dk_dd.d_secsize);
if (bootverbose) {
wp = &du->dk_params;
printf( "wd%d: ATA INQUIRE valid = %04x, "
"dmamword = %04x, apio = %04x, "
"udma = %04x\n",
du->dk_lunit,
wp->wdp_atavalid,
wp->wdp_dmamword,
wp->wdp_eidepiomodes,
wp->wdp_udmamode);
}
/*
* Start timeout routine for this drive.
* XXX timeout should be per controller.
*/
wdtimeout(du);
make_dev(&wd_cdevsw,
dkmakeminor(lunit, WHOLE_DISK_SLICE, RAW_PART),
UID_ROOT, GID_OPERATOR, 0640, "rwd%d", lunit);
/*
* Export the drive to the devstat interface.
*/
devstat_add_entry(&du->dk_stats, "wd",
lunit, du->dk_dd.d_secsize,
DEVSTAT_NO_ORDERED_TAGS,
DEVSTAT_TYPE_DIRECT |
DEVSTAT_TYPE_IF_IDE,
DEVSTAT_PRIORITY_DISK);
} else {
free(du, M_TEMP);
wddrives[lunit] = NULL;
}
}
/*
* Probe all free IDE units, searching for ATAPI drives.
*/
for (unit=0; unit<2; ++unit) {
for (lunit=0; lunit<NWD; ++lunit)
if (wddrives[lunit] &&
wddrives[lunit]->dk_ctrlr == dvp->id_unit &&
wddrives[lunit]->dk_unit == unit)
goto next;
if (atapi_attach (dvp->id_unit, unit, dvp->id_iobase))
atapictrlr = dvp->id_unit;
next: ;
}
/*
* Discard any interrupts generated by wdgetctlr(). wdflushirq()
* doesn't work now because the ambient ipl is too high.
*/
if (eide_quirks & Q_CMD640B) {
wdtab[PRIMARY].b_active = 2;
} else {
wdtab[dvp->id_unit].b_active = 2;
}
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)
{
struct disk *du;
int lunit = dkunit(bp->b_dev);
int s;
/* valid unit, controller, and request? */
if (lunit >= NWD || bp->b_blkno < 0 || (du = wddrives[lunit]) == NULL
|| bp->b_bcount % DEV_BSIZE != 0) {
bp->b_error = EINVAL;
bp->b_flags |= B_ERROR;
goto done;
}
/*
* Do bounds checking, adjust transfer, and set b_pblkno.
*/
if (dscheck(bp, du->dk_slices) <= 0)
goto done;
/* queue transfer on drive, activate drive and controller if idle */
s = splbio();
/* 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;
}
bufqdisksort(&drive_queue[lunit], bp);
if (wdutab[lunit].b_active == 0)
wdustart(du); /* start drive */
if (wdtab[du->dk_ctrlr_cmd640].b_active == 0)
wdstart(du->dk_ctrlr); /* start controller */
/* Tell devstat that we have started a transaction on this drive */
devstat_start_transaction(&du->dk_stats);
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;
int ctrlr = du->dk_ctrlr_cmd640;
/* unit already active? */
if (wdutab[du->dk_lunit].b_active)
return;
bp = bufq_first(&drive_queue[du->dk_lunit]);
if (bp == NULL) { /* yes, an assign */
return;
}
/*
* store away which device we came from.
*/
bp->b_driver1 = du;
bufq_remove(&drive_queue[du->dk_lunit], bp);
/* link onto controller queue */
bufq_insert_tail(&wdtab[ctrlr].controller_queue, bp);
/* mark the drive unit as busy */
wdutab[du->dk_lunit].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.
*/
void
wdstart(int ctrlr)
{
register struct disk *du;
register struct buf *bp;
struct diskgeom *lp; /* XXX sic */
long blknum;
long secpertrk, secpercyl;
u_int lunit;
u_int count;
int ctrlr_atapi;
if (eide_quirks & Q_CMD640B) {
ctrlr = PRIMARY;
ctrlr_atapi = atapictrlr;
} else {
ctrlr_atapi = ctrlr;
}
if (wdtab[ctrlr].b_active == 2)
wdtab[ctrlr].b_active = 0;
if (wdtab[ctrlr].b_active)
return;
/* is there a drive for the controller to do a transfer with? */
bp = bufq_first(&wdtab[ctrlr].controller_queue);
if (bp == NULL) {
if (atapi_start && atapi_start (ctrlr_atapi))
/* mark controller active in ATAPI mode */
wdtab[ctrlr].b_active = 3;
return;
}
/* obtain controller and drive information */
lunit = dkunit(bp->b_dev);
du = wddrives[lunit];
/* 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_pblkno + 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(du->dk_altport));
#endif
lp = &du->dk_dd;
secpertrk = lp->d_nsectors;
secpercyl = lp->d_secpercyl;
if (du->dk_skip == 0)
du->dk_bc = bp->b_bcount;
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)) {
u_int command;
u_int count1;
long cylin, head, sector;
if (du->dk_flags & DKFL_LBA) {
sector = (blknum >> 0) & 0xff;
cylin = (blknum >> 8) & 0xffff;
head = ((blknum >> 24) & 0xf) | WDSD_LBA;
}
else {
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
}
/*
* XXX this looks like an attempt to skip bad sectors
* on write.
*/
if (wdtab[ctrlr].b_errcnt && (bp->b_flags & B_READ) == 0)
du->dk_bc += DEV_BSIZE;
count1 = howmany( du->dk_bc, DEV_BSIZE);
du->dk_flags &= ~DKFL_MULTI;
if (du->dk_flags & DKFL_SINGLE) {
command = (bp->b_flags & B_READ)
? WDCC_READ : WDCC_WRITE;
count1 = 1;
du->dk_currentiosize = 1;
} else {
if((du->dk_flags & DKFL_USEDMA) &&
wddma[du->dk_interface].wdd_dmaverify(du->dk_dmacookie,
(void *)((int)bp->b_data +
du->dk_skip * DEV_BSIZE),
du->dk_bc,
bp->b_flags & B_READ)) {
du->dk_flags |= DKFL_DMA;
if( bp->b_flags & B_READ)
command = WDCC_READ_DMA;
else
command = WDCC_WRITE_DMA;
du->dk_currentiosize = count1;
} else if( (count1 > 1) && (du->dk_multi > 1)) {
du->dk_flags |= DKFL_MULTI;
if( bp->b_flags & B_READ) {
command = WDCC_READ_MULTI;
} else {
command = WDCC_WRITE_MULTI;
}
du->dk_currentiosize = du->dk_multi;
if( du->dk_currentiosize > count1)
du->dk_currentiosize = count1;
} else {
if( bp->b_flags & B_READ) {
command = WDCC_READ;
} else {
command = WDCC_WRITE;
}
du->dk_currentiosize = 1;
}
}
/*
* 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);
}
}
if ((du->dk_flags & (DKFL_DMA|DKFL_SINGLE)) == DKFL_DMA) {
wddma[du->dk_interface].wdd_dmaprep(du->dk_dmacookie,
(void *)((int)bp->b_data +
du->dk_skip * DEV_BSIZE),
du->dk_bc,
bp->b_flags & B_READ);
}
while (wdcommand(du, cylin, head, sector, count1, command)
!= 0) {
wderror(bp, du,
"wdstart: timeout waiting to give command");
wdunwedge(du);
}
#ifdef WDDEBUG
printf("cylin %ld head %ld sector %ld addr %x sts %x\n",
cylin, head, sector,
(int)bp->b_data + du->dk_skip * DEV_BSIZE,
inb(du->dk_altport));
#endif
}
/*
* Schedule wdtimeout() to wake up after a few seconds. Retrying
* unmarked bad blocks can take 3 seconds! Then it is not good that
* we retry 5 times.
*
* On the first try, we give it 10 seconds, for drives that may need
* to spin up.
*
* XXX wdtimeout() doesn't increment the error count so we may loop
* forever. More seriously, the loop isn't forever but causes a
* crash.
*
* TODO fix b_resid bug elsewhere (fd.c....). Fix short but positive
* counts being discarded after there is an error (in physio I
* think). Discarding them would be OK if the (special) file offset
* was not advanced.
*/
if (wdtab[ctrlr].b_errcnt == 0)
du->dk_timeout = 1 + 10;
else
du->dk_timeout = 1 + 3;
/* if this is a DMA op, start DMA and go away until it's done. */
if ((du->dk_flags & (DKFL_DMA|DKFL_SINGLE)) == DKFL_DMA) {
wddma[du->dk_interface].wdd_dmastart(du->dk_dmacookie);
return;
}
/* 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, TIMEOUT) < 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.
*/
}
count = 1;
if( du->dk_flags & DKFL_MULTI) {
count = howmany(du->dk_bc, DEV_BSIZE);
if( count > du->dk_multi)
count = du->dk_multi;
if( du->dk_currentiosize > count)
du->dk_currentiosize = count;
}
if (du->dk_flags & DKFL_32BIT)
outsl(du->dk_port + wd_data,
(void *)((int)bp->b_data + du->dk_skip * DEV_BSIZE),
(count * DEV_BSIZE) / sizeof(long));
else
outsw(du->dk_port + wd_data,
(void *)((int)bp->b_data + du->dk_skip * DEV_BSIZE),
(count * DEV_BSIZE) / sizeof(short));
du->dk_bc -= DEV_BSIZE * count;
}
/* 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(void *unitnum)
{
register struct disk *du;
register struct buf *bp;
int dmastat = 0; /* Shut up GCC */
int unit = (int)unitnum;
int ctrlr_atapi;
if (eide_quirks & Q_CMD640B) {
unit = PRIMARY;
ctrlr_atapi = atapictrlr;
} else {
ctrlr_atapi = unit;
}
if (wdtab[unit].b_active == 2)
return; /* intr in wdflushirq() */
if (!wdtab[unit].b_active) {
#ifdef WDDEBUG
/*
* These happen mostly because the power-mgt part of the
* bios shuts us down, and we just manage to see the
* interrupt from the "SLEEP" command.
*/
printf("wdc%d: extra interrupt\n", unit);
#endif
return;
}
if (wdtab[unit].b_active == 3) {
/* process an ATAPI interrupt */
if (atapi_intr && atapi_intr (ctrlr_atapi))
/* ATAPI op continues */
return;
/* controller is free, start new op */
wdtab[unit].b_active = 0;
wdstart (unit);
return;
}
bp = bufq_first(&wdtab[unit].controller_queue);
du = wddrives[dkunit(bp->b_dev)];
/* finish off DMA */
if ((du->dk_flags & (DKFL_DMA|DKFL_SINGLE)) == DKFL_DMA) {
/* XXX SMP boxes sometimes generate an early intr. Why? */
if ((wddma[du->dk_interface].wdd_dmastatus(du->dk_dmacookie) &
WDDS_INTERRUPT) == 0)
return;
dmastat = wddma[du->dk_interface].wdd_dmadone(du->dk_dmacookie);
}
du->dk_timeout = 0;
/* check drive status/failure */
if (wdwait(du, 0, TIMEOUT) < 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;
switch (wdcontrol(bp)) {
case 0:
return;
case 1:
wdstart(unit);
return;
case 2:
goto done;
}
}
/* have we an error? */
if ((du->dk_status & (WDCS_ERR | WDCS_ECCCOR))
|| (((du->dk_flags & (DKFL_DMA|DKFL_SINGLE)) == DKFL_DMA)
&& dmastat != WDDS_INTERRUPT)) {
unsigned int errstat;
oops:
/*
* XXX bogus inb() here
*/
errstat = inb(du->dk_port + wd_error);
if(((du->dk_flags & (DKFL_DMA|DKFL_SINGLE)) == DKFL_DMA) &&
(errstat & WDERR_ABORT)) {
wderror(bp, du, "reverting to PIO mode");
du->dk_flags &= ~DKFL_USEDMA;
} else if((du->dk_flags & DKFL_MULTI) &&
(errstat & WDERR_ABORT)) {
wderror(bp, du, "reverting to non-multi sector mode");
du->dk_multi = 1;
}
if (!(du->dk_status & (WDCS_ERR | WDCS_ECCCOR)) &&
(((du->dk_flags & (DKFL_DMA|DKFL_SINGLE)) == DKFL_DMA) &&
(dmastat != WDDS_INTERRUPT)))
printf("wd%d: DMA failure, DMA status %b\n",
du->dk_lunit, dmastat, WDDS_BITS);
#ifdef WDDEBUG
wderror(bp, du, "wdintr");
#endif
if ((du->dk_flags & DKFL_SINGLE) == 0) {
du->dk_flags |= DKFL_ERROR;
goto outt;
}
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;
bp->b_flags |= B_ERROR; /* flag the error */
}
} else if (du->dk_status & WDCS_ECCCOR)
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)
&& !((du->dk_flags & (DKFL_DMA|DKFL_SINGLE)) == DKFL_DMA)
&& wdtab[unit].b_active) {
u_int chk, dummy, multisize;
multisize = chk = du->dk_currentiosize * DEV_BSIZE;
if( du->dk_bc < chk) {
chk = du->dk_bc;
if( ((chk + DEV_BSIZE - 1) / DEV_BSIZE) < du->dk_currentiosize) {
du->dk_currentiosize = (chk + DEV_BSIZE - 1) / DEV_BSIZE;
multisize = du->dk_currentiosize * DEV_BSIZE;
}
}
/* 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, TIMEOUT) != 0) {
wderror(bp, du, "wdintr: read error detected late");
goto oops;
}
/* suck in data */
if( du->dk_flags & DKFL_32BIT)
insl(du->dk_port + wd_data,
(void *)((int)bp->b_data + du->dk_skip * DEV_BSIZE),
chk / sizeof(long));
else
insw(du->dk_port + wd_data,
(void *)((int)bp->b_data + du->dk_skip * DEV_BSIZE),
chk / sizeof(short));
du->dk_bc -= chk;
/* XXX for obsolete fractional sector reads. */
while (chk < multisize) {
insw(du->dk_port + wd_data, &dummy, 1);
chk += sizeof(short);
}
}
/* final cleanup on DMA */
if (((bp->b_flags & B_ERROR) == 0)
&& ((du->dk_flags & (DKFL_DMA|DKFL_SINGLE)) == DKFL_DMA)
&& wdtab[unit].b_active) {
int iosize;
iosize = du->dk_currentiosize * DEV_BSIZE;
du->dk_bc -= iosize;
}
outt:
if (wdtab[unit].b_active) {
if ((bp->b_flags & B_ERROR) == 0) {
du->dk_skip += du->dk_currentiosize;/* 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) {
if( (du->dk_flags & DKFL_SINGLE) ||
((bp->b_flags & B_READ) == 0)) {
wdtab[unit].b_active = 0;
wdstart(unit);
} else {
du->dk_timeout = 1 + 3;
}
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 */
}
}
done: ;
/* done with this transfer, with or without error */
du->dk_flags &= ~(DKFL_SINGLE|DKFL_DMA);
bufq_remove( &wdtab[unit].controller_queue, bp);
wdtab[unit].b_errcnt = 0;
bp->b_resid = bp->b_bcount - du->dk_skip * DEV_BSIZE;
wdutab[du->dk_lunit].b_active = 0;
du->dk_skip = 0;
devstat_end_transaction_buf(&du->dk_stats, bp);
biodone(bp);
}
/* controller idle */
wdtab[unit].b_active = 0;
/* anything more on drive queue? */
wdustart(du);
/* anything more for controller to do? */
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 error;
lunit = dkunit(dev);
if (lunit >= NWD || dktype(dev) != 0)
return (ENXIO);
du = wddrives[lunit];
if (du == NULL)
return (ENXIO);
dev->si_iosize_max = 248 * 512;
/* Finish flushing IRQs left over from wdattach(). */
if (wdtab[du->dk_ctrlr_cmd640].b_active == 2)
wdtab[du->dk_ctrlr_cmd640].b_active = 0;
/* spin waiting for anybody else reading the disk label */
while (du->dk_flags & DKFL_LABELLING)
tsleep((caddr_t)&du->dk_flags, PZERO - 1, "wdopen", 1);
#if 1
wdsleep(du->dk_ctrlr, "wdopn1");
du->dk_flags |= DKFL_LABELLING;
du->dk_state = WANTOPEN;
{
struct disklabel label;
bzero(&label, sizeof label);
label.d_secsize = du->dk_dd.d_secsize;
label.d_nsectors = du->dk_dd.d_nsectors;
label.d_ntracks = du->dk_dd.d_ntracks;
label.d_ncylinders = du->dk_dd.d_ncylinders;
label.d_secpercyl = du->dk_dd.d_secpercyl;
label.d_secperunit = du->dk_dd.d_secperunit;
error = dsopen(dev, fmt, 0, &du->dk_slices, &label);
}
du->dk_flags &= ~DKFL_LABELLING;
wdsleep(du->dk_ctrlr, "wdopn2");
return (error);
#else
if ((du->dk_flags & DKFL_BSDLABEL) == 0) {
/*
* wdtab[ctrlr].b_active != 0 implies XXX applicable now ??
* drive_queue[lunit].b_act == NULL (?) XXX applicable now ??
* 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;
du->dk_state = WANTOPEN;
error = dsinit(dkmodpart(dev, RAW_PART),
&du->dk_dd, &du->dk_slices);
if (error != 0) {
du->dk_flags &= ~DKFL_LABELLING;
return (error);
}
/* XXX check value returned by wdwsetctlr(). */
wdwsetctlr(du);
if (dkslice(dev) == WHOLE_DISK_SLICE) {
dsopen(dev, fmt, du->dk_slices);
return (0);
}
/*
* Read label using RAW_PART 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.
*
* XXX can now handle changes directly since dsinit() doesn't
* do too much.
*/
msg = correct_readdisklabel(dkmodpart(dev, RAW_PART),
&du->dk_dd);
/* XXX check value returned by wdwsetctlr(). */
wdwsetctlr(du);
du->dk_flags &= ~DKFL_LABELLING;
if (msg != NULL) {
log(LOG_WARNING, "wd%d: cannot find label (%s)\n",
lunit, msg);
if (part != RAW_PART)
return (EINVAL); /* XXX needs translation */
/*
* Soon return. This is how slices without labels
* are allowed. They only work on the raw partition.
*/
} else {
unsigned long newsize, offset, size;
#if 0
/*
* Force RAW_PART partition to be the whole disk.
*/
offset = du->dk_dd.d_partitions[RAW_PART].p_offset;
if (offset != 0) {
printf(
"wd%d: changing offset of '%c' partition from %lu to 0\n",
du->dk_lunit, 'a' + RAW_PART, offset);
du->dk_dd.d_partitions[RAW_PART].p_offset = 0;
}
size = du->dk_dd.d_partitions[RAW_PART].p_size;
newsize = du->dk_dd.d_secperunit; /* XXX */
if (size != newsize) {
printf(
"wd%d: changing size of '%c' partition from %lu to %lu\n",
du->dk_lunit, 'a' + RAW_PART, size,
newsize);
du->dk_dd.d_partitions[RAW_PART].p_size
= newsize;
}
#endif
}
/* 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 != RAW_PART) {
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 == RAW_PART)
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 != RAW_PART)
return (ENXIO);
dsopen(dev, fmt, du->dk_slices);
return (0);
#endif
}
/*
* Implement operations other than read/write.
* Called from wdstart or wdintr during opens.
* Uses finite-state-machine to track progress of operation in progress.
* Returns 0 if operation still in progress, 1 if completed, 2 if error.
*/
static int
wdcontrol(register struct buf *bp)
{
register struct disk *du;
int ctrlr;
du = wddrives[dkunit(bp->b_dev)];
ctrlr = du->dk_ctrlr_cmd640;
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);
du->dk_state = WANTOPEN;
if (++wdtab[ctrlr].b_errcnt < RETRIES)
goto tryagainrecal;
bp->b_error = ENXIO; /* XXX needs translation */
bp->b_flags |= B_ERROR;
return (2);
}
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 (2);
}
/*
* 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;
wdc = du->dk_port;
if (du->cfg_flags & WDOPT_SLEEPHACK) {
/* OK, so the APM bios has put the disk into SLEEP mode,
* how can we tell ? Uhm, we can't. There is no
* standardized way of finding out, and the only way to
* wake it up is to reset it. Bummer.
*
* All the many and varied versions of the IDE/ATA standard
* explicitly tells us not to look at these registers if
* the disk is in SLEEP mode. Well, too bad really, we
* have to find out if it's in sleep mode before we can
* avoid reading the registers.
*
* I have reason to belive that most disks will return
* either 0xff or 0x00 in all but the status register
* when in SLEEP mode, but I have yet to see one return
* 0x00, so we don't check for that yet.
*
* The check for WDCS_BUSY is for the case where the
* bios spins up the disk for us, but doesn't initialize
* it correctly /phk
*/
if(inb(wdc + wd_precomp) + inb(wdc + wd_cyl_lo) +
inb(wdc + wd_cyl_hi) + inb(wdc + wd_sdh) +
inb(wdc + wd_sector) + inb(wdc + wd_seccnt) == 6 * 0xff) {
if (bootverbose)
printf("wd(%d,%d): disk aSLEEP\n",
du->dk_ctrlr, du->dk_unit);
wdunwedge(du);
} else if(inb(wdc + wd_status) == WDCS_BUSY) {
if (bootverbose)
printf("wd(%d,%d): disk is BUSY\n",
du->dk_ctrlr, du->dk_unit);
wdunwedge(du);
}
}
if (wdwait(du, 0, TIMEOUT) < 0)
return (1);
if( command == WDCC_FEATURES) {
outb(wdc + wd_sdh, WDSD_IBM | (du->dk_unit << 4) | head);
outb(wdc + wd_features, count);
if ( count == WDFEA_SETXFER )
outb(wdc + wd_seccnt, sector);
} else {
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);
if (head & WDSD_LBA)
outb(wdc + wd_sector, sector);
else
outb(wdc + wd_sector, sector + 1);
outb(wdc + wd_seccnt, count);
}
if (wdwait(du, (command == WDCC_DIAGNOSE || command == WDCC_IDC)
? 0 : WDCS_READY, TIMEOUT) < 0)
return (1);
outb(wdc + wd_command, command);
return (0);
}
static void
wdsetmulti(struct disk *du)
{
/*
* The config option flags low 8 bits define the maximum multi-block
* transfer size. If the user wants the maximum that the drive
* is capable of, just set the low bits of the config option to
* 0x00ff.
*/
if ((du->cfg_flags & WDOPT_MULTIMASK) != 0 && (du->dk_multi > 1)) {
int configval = du->cfg_flags & WDOPT_MULTIMASK;
du->dk_multi = min(du->dk_multi, configval);
if (wdcommand(du, 0, 0, 0, du->dk_multi, WDCC_SET_MULTI)) {
du->dk_multi = 1;
} else {
if (wdwait(du, WDCS_READY, TIMEOUT) < 0) {
du->dk_multi = 1;
}
}
} else {
du->dk_multi = 1;
}
}
/*
* issue IDC to drive to tell it just what geometry it is to be.
*/
static int
wdsetctlr(struct disk *du)
{
int error = 0;
#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 (!(du->dk_flags & DKFL_LBA)) {
if (du->dk_dd.d_ntracks == 0 || du->dk_dd.d_ntracks > 16) {
struct wdparams *wp;
printf("wd%d: can't handle %lu heads from partition table ",
du->dk_lunit, du->dk_dd.d_ntracks);
/* obtain parameters */
wp = &du->dk_params;
if (wp->wdp_heads > 0 && wp->wdp_heads <= 16) {
printf("(controller value %u restored)\n",
wp->wdp_heads);
du->dk_dd.d_ntracks = wp->wdp_heads;
}
else {
printf("(truncating to 16)\n");
du->dk_dd.d_ntracks = 16;
}
}
if (du->dk_dd.d_nsectors == 0 || du->dk_dd.d_nsectors > 255) {
printf("wd%d: cannot handle %lu sectors (max 255)\n",
du->dk_lunit, du->dk_dd.d_nsectors);
error = 1;
}
if (error) {
wdtab[du->dk_ctrlr_cmd640].b_errcnt += RETRIES;
return (1);
}
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, TIMEOUT) < 0) {
wderror((struct buf *)NULL, du, "wdsetctlr failed");
return (1);
}
}
wdsetmulti(du);
#ifdef NOTYET
/* set read caching and write caching */
wdcommand(du, 0, 0, 0, WDFEA_RCACHE, WDCC_FEATURES);
wdwait(du, WDCS_READY, TIMEOUT);
wdcommand(du, 0, 0, 0, WDFEA_WCACHE, WDCC_FEATURES);
wdwait(du, WDCS_READY, TIMEOUT);
#endif
return (0);
}
#if 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);
wdflushirq(du, x);
splx(x);
return (stat);
}
#endif
/*
* gross little callback function for wdddma interface. returns 1 for
* success, 0 for failure.
*/
static int
wdsetmode(int mode, void *wdinfo)
{
int i;
struct disk *du;
du = wdinfo;
if (bootverbose)
printf("wd%d: wdsetmode() setting transfer mode to %02x\n",
du->dk_lunit, mode);
i = wdcommand(du, 0, 0, mode, WDFEA_SETXFER,
WDCC_FEATURES) == 0 &&
wdwait(du, WDCS_READY, TIMEOUT) == 0;
return i;
}
/*
* issue READP to drive to ask it what it is.
*/
static int
wdgetctlr(struct disk *du)
{
int i;
char tb[DEV_BSIZE], tb2[DEV_BSIZE];
struct wdparams *wp = NULL;
u_long flags = du->cfg_flags;
again:
if (wdcommand(du, 0, 0, 0, 0, WDCC_READP) != 0
|| wdwait(du, WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ, TIMEOUT) != 0) {
/*
* if we failed on the second try, assume non-32bit
*/
if( du->dk_flags & DKFL_32BIT)
goto failed;
/* XXX need to check error status after final transfer. */
/*
* Old drives don't support WDCC_READP. Try a seek to 0.
* Some IDE controllers return trash if there is no drive
* attached, so first test that the drive can be selected.
* This also avoids long waits for nonexistent drives.
*/
if (wdwait(du, 0, TIMEOUT) < 0)
return (1);
outb(du->dk_port + wd_sdh, WDSD_IBM | (du->dk_unit << 4));
DELAY(5000); /* usually unnecessary; drive select is fast */
/*
* Do this twice: may get a false WDCS_READY the first time.
*/
inb(du->dk_port + wd_status);
if ((inb(du->dk_port + wd_status) & (WDCS_BUSY | WDCS_READY))
!= WDCS_READY
|| wdcommand(du, 0, 0, 0, 0, WDCC_RESTORE | WD_STEP) != 0
|| wdwait(du, WDCS_READY | WDCS_SEEKCMPLT, TIMEOUT) != 0)
return (1);
if (du->dk_unit == bootinfo.bi_n_bios_used) {
du->dk_dd.d_secsize = DEV_BSIZE;
du->dk_dd.d_nsectors =
bootinfo.bi_bios_geom[du->dk_unit] & 0xff;
du->dk_dd.d_ntracks =
((bootinfo.bi_bios_geom[du->dk_unit] >> 8) & 0xff)
+ 1;
/* XXX Why 2 ? */
du->dk_dd.d_ncylinders =
(bootinfo.bi_bios_geom[du->dk_unit] >> 16) + 2;
du->dk_dd.d_secpercyl =
du->dk_dd.d_ntracks * du->dk_dd.d_nsectors;
du->dk_dd.d_secperunit =
du->dk_dd.d_secpercyl * du->dk_dd.d_ncylinders;
#if 0
du->dk_dd.d_partitions[WDRAW].p_size =
du->dk_dd.d_secperunit;
du->dk_dd.d_type = DTYPE_ST506;
du->dk_dd.d_subtype |= DSTYPE_GEOMETRY;
strncpy(du->dk_dd.d_typename, "Bios geometry",
sizeof du->dk_dd.d_typename);
strncpy(du->dk_params.wdp_model, "ST506",
sizeof du->dk_params.wdp_model);
#endif
bootinfo.bi_n_bios_used ++;
return 0;
}
/*
* Fake minimal drive geometry for reading the MBR.
* readdisklabel() may enlarge it to read the 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;
du->dk_dd.d_secperunit = 17;
#if 0
/*
* Fake maximal drive size for writing the label.
*/
du->dk_dd.d_partitions[RAW_PART].p_size = 64 * 16 * 1024;
/*
* 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);
#endif
/* Fake the model name for printing by wdattach(). */
strncpy(du->dk_params.wdp_model, "unknown",
sizeof du->dk_params.wdp_model);
return (0);
}
/* obtain parameters */
wp = &du->dk_params;
if (du->dk_flags & DKFL_32BIT)
insl(du->dk_port + wd_data, tb, sizeof(tb) / sizeof(long));
else
insw(du->dk_port + wd_data, tb, sizeof(tb) / sizeof(short));
/* try 32-bit data path (VLB IDE controller) */
if (flags & WDOPT_32BIT) {
if (! (du->dk_flags & DKFL_32BIT)) {
bcopy(tb, tb2, sizeof(struct wdparams));
du->dk_flags |= DKFL_32BIT;
goto again;
}
/* check that we really have 32-bit controller */
if (bcmp (tb, tb2, sizeof(struct wdparams)) != 0) {
failed:
/* test failed, use 16-bit i/o mode */
bcopy(tb2, tb, sizeof(struct wdparams));
du->dk_flags &= ~DKFL_32BIT;
}
}
bcopy(tb, wp, sizeof(struct wdparams));
/* shuffle string byte order */
for (i = 0; (unsigned)i < sizeof(wp->wdp_model); i += 2) {
u_short *p;
p = (u_short *) (wp->wdp_model + i);
*p = ntohs(*p);
}
/*
* Clean up the wdp_model by converting nulls to spaces, and
* then removing the trailing spaces.
*/
for (i = 0; (unsigned)i < sizeof(wp->wdp_model); i++) {
if (wp->wdp_model[i] == '\0') {
wp->wdp_model[i] = ' ';
}
}
for (i = sizeof(wp->wdp_model) - 1;
(i >= 0 && wp->wdp_model[i] == ' '); i--) {
wp->wdp_model[i] = '\0';
}
/*
* find out the drives maximum multi-block transfer capability
*/
du->dk_multi = wp->wdp_nsecperint & 0xff;
wdsetmulti(du);
/*
* check drive's DMA capability
*/
if (wddma[du->dk_interface].wdd_candma) {
du->dk_dmacookie = wddma[du->dk_interface].wdd_candma(
du->dk_port, du->dk_ctrlr, du->dk_unit);
/* does user want this? */
if ((du->cfg_flags & WDOPT_DMA) &&
/* have we got a DMA controller? */
du->dk_dmacookie &&
/* can said drive do DMA? */
wddma[du->dk_interface].wdd_dmainit(du->dk_dmacookie, wp, wdsetmode, du)) {
du->dk_flags |= DKFL_USEDMA;
}
} else {
du->dk_dmacookie = NULL;
}
#ifdef WDDEBUG
printf(
"\nwd(%d,%d): wdgetctlr: 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_cylinders,
wp->wdp_heads, wp->wdp_sectors, wp->wdp_buffertype,
wp->wdp_buffersize, wp->wdp_model);
#endif
/* update disklabel given drive information */
du->dk_dd.d_secsize = DEV_BSIZE;
if ((du->cfg_flags & WDOPT_LBA) && wp->wdp_lbasize) {
du->dk_dd.d_nsectors = 63;
if (wp->wdp_lbasize < 16*63*1024) { /* <=528.4 MB */
du->dk_dd.d_ntracks = 16;
}
else if (wp->wdp_lbasize < 32*63*1024) { /* <=1.057 GB */
du->dk_dd.d_ntracks = 32;
}
else if (wp->wdp_lbasize < 64*63*1024) { /* <=2.114 GB */
du->dk_dd.d_ntracks = 64;
}
else if (wp->wdp_lbasize < 128*63*1024) { /* <=4.228 GB */
du->dk_dd.d_ntracks = 128;
}
else if (wp->wdp_lbasize < 255*63*1024) { /* <=8.422 GB */
du->dk_dd.d_ntracks = 255;
}
else { /* >8.422 GB */
du->dk_dd.d_ntracks = 255; /* XXX */
}
du->dk_dd.d_secpercyl= du->dk_dd.d_ntracks*du->dk_dd.d_nsectors;
du->dk_dd.d_ncylinders = wp->wdp_lbasize/du->dk_dd.d_secpercyl;
du->dk_dd.d_secperunit = wp->wdp_lbasize;
du->dk_flags |= DKFL_LBA;
}
else {
du->dk_dd.d_ncylinders = wp->wdp_cylinders; /* +- 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;
du->dk_dd.d_secperunit =
du->dk_dd.d_secpercyl * du->dk_dd.d_ncylinders;
if (wp->wdp_cylinders == 16383 &&
du->dk_dd.d_secperunit < wp->wdp_lbasize) {
du->dk_dd.d_secperunit = wp->wdp_lbasize;
du->dk_dd.d_ncylinders =
du->dk_dd.d_secperunit / du->dk_dd.d_secpercyl;
}
}
if (WDOPT_FORCEHD(du->cfg_flags)) {
du->dk_dd.d_ntracks = WDOPT_FORCEHD(du->cfg_flags);
du->dk_dd.d_secpercyl =
du->dk_dd.d_ntracks * du->dk_dd.d_nsectors;
du->dk_dd.d_ncylinders =
du->dk_dd.d_secperunit / du->dk_dd.d_secpercyl;
}
if (du->dk_dd.d_ncylinders > 0x10000 && !(du->cfg_flags & WDOPT_LBA)) {
du->dk_dd.d_ncylinders = 0x10000;
du->dk_dd.d_secperunit = du->dk_dd.d_secpercyl *
du->dk_dd.d_ncylinders;
printf(
"wd%d: cannot handle %d total sectors; truncating to %lu\n",
du->dk_lunit, wp->wdp_lbasize, du->dk_dd.d_secperunit);
}
#if 0
du->dk_dd.d_partitions[RAW_PART].p_size = du->dk_dd.d_secperunit;
/* 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;
#endif
return (0);
}
int
wdclose(dev_t dev, int flags, int fmt, struct proc *p)
{
dsclose(dev, fmt, wddrives[dkunit(dev)]->dk_slices);
return (0);
}
int
wdioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
{
int lunit = dkunit(dev);
register struct disk *du;
int error;
du = wddrives[lunit];
wdsleep(du->dk_ctrlr, "wdioct");
error = dsioctl(dev, cmd, addr, flags, &du->dk_slices);
if (error != ENOIOCTL)
return (error);
return (ENOTTY);
}
int
wdsize(dev_t dev)
{
struct disk *du;
int lunit;
lunit = dkunit(dev);
if (lunit >= NWD || dktype(dev) != 0)
return (-1);
du = wddrives[lunit];
if (du == NULL)
return (-1);
return (dssize(dev, &du->dk_slices));
}
int
wddump(dev_t dev)
{
register struct disk *du;
struct disklabel *lp;
long num; /* number of sectors to write */
int lunit, part;
long blkoff, blknum;
long blkcnt, blknext;
u_long ds_offset;
u_long nblocks;
static int wddoingadump = 0;
long cylin, head, sector;
long secpertrk, secpercyl;
char *addr;
/* Toss any characters present prior to dump. */
while (cncheckc() != -1)
;
/* Check for acceptable device. */
/* XXX should reset to maybe allow du->dk_state < OPEN. */
lunit = dkunit(dev); /* eventually support floppies? */
part = dkpart(dev);
if (lunit >= NWD || (du = wddrives[lunit]) == NULL
|| du->dk_state < OPEN
|| (lp = dsgetlabel(dev, du->dk_slices)) == NULL)
return (ENXIO);
/* Size of memory to dump, in disk sectors. */
num = (u_long)Maxmem * PAGE_SIZE / du->dk_dd.d_secsize;
secpertrk = du->dk_dd.d_nsectors;
secpercyl = du->dk_dd.d_secpercyl;
nblocks = lp->d_partitions[part].p_size;
blkoff = lp->d_partitions[part].p_offset;
/* XXX */
ds_offset = du->dk_slices->dss_slices[dkslice(dev)].ds_offset;
blkoff += ds_offset;
#if 0
pg("part %x, nblocks %d, dumplo %d num %d\n",
part, nblocks, dumplo, num);
#endif
/* Check transfer bounds against partition size. */
if (dumplo < 0 || dumplo + num > nblocks)
return (EINVAL);
/* Check if we are being called recursively. */
if (wddoingadump)
return (EFAULT);
#if 0
/* Mark controller active for if we panic during the dump. */
wdtab[du->dk_ctrlr].b_active = 1;
#endif
wddoingadump = 1;
/* Recalibrate the drive. */
DELAY(5); /* ATA spec XXX NOT */
if (wdcommand(du, 0, 0, 0, 0, WDCC_RESTORE | WD_STEP) != 0
|| wdwait(du, WDCS_READY | WDCS_SEEKCMPLT, TIMEOUT) != 0
|| wdsetctlr(du) != 0) {
wderror((struct buf *)NULL, du, "wddump: recalibrate failed");
return (EIO);
}
du->dk_flags |= DKFL_SINGLE;
addr = (char *) 0;
blknum = dumplo + blkoff;
while (num > 0) {
blkcnt = num;
if (blkcnt > MAXTRANSFER)
blkcnt = MAXTRANSFER;
/* Keep transfer within current cylinder. */
if ((blknum + blkcnt - 1) / secpercyl != blknum / secpercyl)
blkcnt = secpercyl - (blknum % secpercyl);
blknext = blknum + blkcnt;
/*
* See if one of the sectors is in the bad sector list
* (if we have one). If the first sector is bad, then
* reduce the transfer to this one bad sector; if another
* sector is bad, then reduce reduce the transfer to
* avoid any bad sectors.
*/
/* Compute disk address. */
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
#if 0
/* Let's just talk about this first... */
pg("cylin l%d head %ld sector %ld addr 0x%x count %ld",
cylin, head, sector, addr, blkcnt);
#endif
/* Do the write. */
if (wdcommand(du, cylin, head, sector, blkcnt, WDCC_WRITE)
!= 0) {
wderror((struct buf *)NULL, du,
"wddump: timeout waiting to to give command");
return (EIO);
}
while (blkcnt != 0) {
if (is_physical_memory((vm_offset_t)addr))
pmap_enter(kernel_pmap, (vm_offset_t)CADDR1,
trunc_page((vm_offset_t)addr), VM_PROT_READ, TRUE);
else
pmap_enter(kernel_pmap, (vm_offset_t)CADDR1,
trunc_page(0), VM_PROT_READ, TRUE);
/* Ready to send data? */
DELAY(5); /* ATA spec */
if (wdwait(du, WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ, TIMEOUT)
< 0) {
wderror((struct buf *)NULL, du,
"wddump: timeout waiting for DRQ");
return (EIO);
}
if (du->dk_flags & DKFL_32BIT)
outsl(du->dk_port + wd_data,
CADDR1 + ((int)addr & PAGE_MASK),
DEV_BSIZE / sizeof(long));
else
outsw(du->dk_port + wd_data,
CADDR1 + ((int)addr & PAGE_MASK),
DEV_BSIZE / sizeof(short));
addr += DEV_BSIZE;
/*
* If we are dumping core, it may take a while.
* So reassure the user and hold off any watchdogs.
*/
if ((unsigned)addr % (1024 * 1024) == 0) {
#ifdef HW_WDOG
if (wdog_tickler)
(*wdog_tickler)();
#endif /* HW_WDOG */
printf("%ld ", num / (1024 * 1024 / DEV_BSIZE));
}
num--;
blkcnt--;
}
/* Wait for completion. */
DELAY(5); /* ATA spec XXX NOT */
if (wdwait(du, WDCS_READY | WDCS_SEEKCMPLT, TIMEOUT) < 0) {
wderror((struct buf *)NULL, du,
"wddump: timeout waiting for status");
return (EIO);
}
/* Check final status. */
if ((du->dk_status
& (WDCS_READY | WDCS_SEEKCMPLT | WDCS_DRQ | WDCS_ERR))
!= (WDCS_READY | WDCS_SEEKCMPLT)) {
wderror((struct buf *)NULL, du,
"wddump: extra DRQ, or error");
return (EIO);
}
/* Update block count. */
blknum = blknext;
/* Operator aborting dump? */
if (cncheckc() != -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, mesg, LOG_PRINTF, du->dk_skip,
dsgetlabel(bp->b_dev, du->dk_slices));
printf(" (status %b error %b)\n",
du->dk_status, WDCS_BITS, du->dk_error, WDERR_BITS);
}
/*
* Discard any interrupts that were latched by the interrupt system while
* we were doing polled i/o.
*/
static void
wdflushirq(struct disk *du, int old_ipl)
{
wdtab[du->dk_ctrlr_cmd640].b_active = 2;
splx(old_ipl);
(void)splbio();
wdtab[du->dk_ctrlr_cmd640].b_active = 0;
}
/*
* Reset the controller.
*/
static int
wdreset(struct disk *du)
{
int err = 0;
if ((du->dk_flags & (DKFL_DMA|DKFL_SINGLE)) == DKFL_DMA)
wddma[du->dk_interface].wdd_dmadone(du->dk_dmacookie);
(void)wdwait(du, 0, TIMEOUT);
outb(du->dk_altport, WDCTL_IDS | WDCTL_RST);
DELAY(10 * 1000);
outb(du->dk_altport, WDCTL_IDS);
outb(du->dk_port + wd_sdh, WDSD_IBM | (du->dk_unit << 4));
if (wdwait(du, 0, TIMEOUT) != 0)
err = 1; /* no IDE drive found */
du->dk_error = inb(du->dk_port + wd_error);
if (du->dk_error != 0x01)
err = 1; /* the drive is incompatible */
outb(du->dk_altport, WDCTL_4BIT);
return (err);
}
/*
* 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)
{
int s = splbio();
if (eide_quirks & Q_CMD640B)
ctrlr = PRIMARY;
while (wdtab[ctrlr].b_active)
tsleep((caddr_t)&wdtab[ctrlr].b_active, PZERO - 1, wmesg, 1);
splx(s);
}
static void
wdtimeout(void *cdu)
{
struct disk *du;
int x;
static int timeouts;
du = (struct disk *)cdu;
x = splbio();
if (du->dk_timeout != 0 && --du->dk_timeout == 0) {
if(timeouts++ <= 5) {
char *msg;
msg = (timeouts > 5) ?
"Last time I say: interrupt timeout. Probably a portable PC." :
"interrupt timeout";
wderror((struct buf *)NULL, du, msg);
if (du->dk_dmacookie)
printf("wd%d: wdtimeout() DMA status %b\n",
du->dk_lunit,
wddma[du->dk_interface].wdd_dmastatus(du->dk_dmacookie),
WDDS_BITS);
}
wdunwedge(du);
wdflushirq(du, x);
du->dk_skip = 0;
du->dk_flags |= DKFL_SINGLE;
wdstart(du->dk_ctrlr);
}
timeout(wdtimeout, cdu, hz);
splx(x);
}
/*
* 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, TIMEOUT) == 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.
*/
#ifdef WD_COUNT_RETRIES
static int min_retries[NWDC];
#endif
static int
wdwait(struct disk *du, u_char bits_wanted, int timeout)
{
int wdc;
u_char status;
#define POLLING 1000
wdc = du->dk_port;
timeout += POLLING;
/*
* This delay is really too long, but does not impact the performance
* as much when using the multi-sector option. Shorter delays have
* caused I/O errors on some drives and system configs. This should
* probably be fixed if we develop a better short term delay mechanism.
*/
DELAY(1);
do {
#ifdef WD_COUNT_RETRIES
if (min_retries[du->dk_ctrlr] > timeout
|| min_retries[du->dk_ctrlr] == 0)
min_retries[du->dk_ctrlr] = timeout;
#endif
du->dk_status = status = inb(wdc + wd_status);
/*
* Atapi drives have a very interesting feature, when attached
* as a slave on the IDE bus, and there is no master.
* They release the bus after getting the command.
* We should reselect the drive here to get the status.
*/
if (status == 0xff) {
outb(wdc + wd_sdh, WDSD_IBM | du->dk_unit << 4);
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 (timeout < 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);
else
DELAY(1);
} while (--timeout != 0);
return (-1);
}
#endif /* NWDC > 0 */
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