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Differential D4713 Diff 15067 sys/boot/pc98/libpc98/biosdisk.c

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sys/boot/pc98/libpc98/biosdisk.c

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* BIOS unit number. * BIOS unit number.
*/ */
static struct bdinfo static struct bdinfo
{ {
int bd_unit; /* BIOS unit number */ int bd_unit; /* BIOS unit number */
int bd_flags; int bd_flags;
int bd_type; /* BIOS 'drive type' (floppy only) */ int bd_type; /* BIOS 'drive type' (floppy only) */
int bd_da_unit; /* kernel unit number for da */ int bd_da_unit; /* kernel unit number for da */
int bd_open; /* reference counter */
void *bd_bcache; /* buffer cache data */
} bdinfo [MAXBDDEV]; } bdinfo [MAXBDDEV];
static int nbdinfo = 0; static int nbdinfo = 0;
#define BD(dev) (bdinfo[(dev)->d_unit])
static int bd_getgeom(struct open_disk *od); static int bd_getgeom(struct open_disk *od);
static int bd_read(struct open_disk *od, daddr_t dblk, int blks, static int bd_read(struct open_disk *od, daddr_t dblk, int blks,
caddr_t dest); caddr_t dest);
static int bd_write(struct open_disk *od, daddr_t dblk, int blks, static int bd_write(struct open_disk *od, daddr_t dblk, int blks,
caddr_t dest); caddr_t dest);
static int bd_int13probe(struct bdinfo *bd); static int bd_int13probe(struct bdinfo *bd);
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bd_init(void) bd_init(void)
{ {
int base, unit; int base, unit;
int da_drive=0, n=-0x10; int da_drive=0, n=-0x10;
/* sequence 0x90, 0x80, 0xa0 */ /* sequence 0x90, 0x80, 0xa0 */
for (base = 0x90; base <= 0xa0; base += n, n += 0x30) { for (base = 0x90; base <= 0xa0; base += n, n += 0x30) {
for (unit = base; (nbdinfo < MAXBDDEV) || ((unit & 0x0f) < 4); unit++) { for (unit = base; (nbdinfo < MAXBDDEV) || ((unit & 0x0f) < 4); unit++) {
bdinfo[nbdinfo].bd_open = 0;
bdinfo[nbdinfo].bd_bcache = NULL;
bdinfo[nbdinfo].bd_unit = unit; bdinfo[nbdinfo].bd_unit = unit;
bdinfo[nbdinfo].bd_flags = (unit & 0xf0) == 0x90 ? BD_FLOPPY : 0; bdinfo[nbdinfo].bd_flags = (unit & 0xf0) == 0x90 ? BD_FLOPPY : 0;
if (!bd_int13probe(&bdinfo[nbdinfo])){ if (!bd_int13probe(&bdinfo[nbdinfo])){
if (((unit & 0xf0) == 0x90 && (unit & 0x0f) < 4) || if (((unit & 0xf0) == 0x90 && (unit & 0x0f) < 4) ||
((unit & 0xf0) == 0xa0 && (unit & 0x0f) < 6)) ((unit & 0xf0) == 0xa0 && (unit & 0x0f) < 6))
continue; /* Target IDs are not contiguous. */ continue; /* Target IDs are not contiguous. */
else else
Show All 13 Lines if ((unit & 0xF0) == 0xA0) /* SCSI HD or MO */
bdinfo[nbdinfo].bd_da_unit = da_drive++; bdinfo[nbdinfo].bd_da_unit = da_drive++;
} }
/* XXX we need "disk aliases" to make this simpler */ /* XXX we need "disk aliases" to make this simpler */
printf("BIOS drive %c: is disk%d\n", printf("BIOS drive %c: is disk%d\n",
'A' + nbdinfo, nbdinfo); 'A' + nbdinfo, nbdinfo);
nbdinfo++; nbdinfo++;
} }
} }
bcache_add_dev(nbdinfo);
return(0); return(0);
} }
/* /*
* Try to detect a device supported by the legacy int13 BIOS * Try to detect a device supported by the legacy int13 BIOS
*/ */
static int static int
bd_int13probe(struct bdinfo *bd) bd_int13probe(struct bdinfo *bd)
▲ Show 20 Lines • Show All 206 Lines • ▼ Show 20 Linesbd_open(struct open_file *f, ...)
int error; int error;
va_start(ap, f); va_start(ap, f);
dev = va_arg(ap, struct i386_devdesc *); dev = va_arg(ap, struct i386_devdesc *);
va_end(ap); va_end(ap);
if ((error = bd_opendisk(&od, dev))) if ((error = bd_opendisk(&od, dev)))
return(error); return(error);
BD(dev).bd_open++;
if (BD(dev).bd_bcache == NULL)
BD(dev).bd_bcache = bcache_allocate();
/* /*
* Save our context * Save our context
*/ */
((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od; ((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od;
DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff); DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff);
return(0); return(0);
} }
▲ Show 20 Lines • Show All 253 Lines • ▼ Show 20 Lines for (i = 0; i < od->od_nslices; i++, dp++) {
} }
} }
return (prefslice); return (prefslice);
} }
static int static int
bd_close(struct open_file *f) bd_close(struct open_file *f)
{ {
struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data); struct i386_devdesc *dev = f->f_devdata;
struct open_disk *od = (struct open_disk *)(dev->d_kind.biosdisk.data);
BD(dev).bd_open--;
if (BD(dev).bd_open == 0) {
bcache_free(BD(dev).bd_bcache);
BD(dev).bd_bcache = NULL;
}
bd_closedisk(od); bd_closedisk(od);
return(0); return(0);
} }
static void static void
bd_closedisk(struct open_disk *od) bd_closedisk(struct open_disk *od)
{ {
DEBUG("open_disk %p", od); DEBUG("open_disk %p", od);
#if 0 #if 0
/* XXX is this required? (especially if disk already open...) */ /* XXX is this required? (especially if disk already open...) */
if (od->od_flags & BD_FLOPPY) if (od->od_flags & BD_FLOPPY)
delay(3000000); delay(3000000);
#endif #endif
free(od); free(od);
} }
static int static int
bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize) bd_strategy(void *devdata, int rw, daddr_t dblk, size_t offset, size_t size,
char *buf, size_t *rsize)
{ {
struct bcache_devdata bcd; struct bcache_devdata bcd;
struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data); struct i386_devdesc *dev = f->f_devdata;
struct open_disk *od = (struct open_disk *)(dev->d_kind.biosdisk.data);
bcd.dv_strategy = bd_realstrategy; bcd.dv_strategy = bd_realstrategy;
bcd.dv_devdata = devdata; bcd.dv_devdata = devdata;
return(bcache_strategy(&bcd, od->od_unit, rw, dblk+od->od_boff, size, buf, rsize)); bcd.dv_cache = BD(dev).bd_bcache;
return(bcache_strategy(&bcd, od->od_unit, rw, dblk+od->od_boff, offset,
size, buf, rsize));
} }
static int static int
bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize) bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t offset,
size_t size, char *buf, size_t *rsize)
{ {
struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data); struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);
int blks; int blks;
#ifdef BD_SUPPORT_FRAGS #ifdef BD_SUPPORT_FRAGS
char fragbuf[BIOSDISK_SECSIZE]; char fragbuf[BIOSDISK_SECSIZE];
size_t fragsize; size_t fragsize;
fragsize = size % BIOSDISK_SECSIZE; fragsize = size % BIOSDISK_SECSIZE;
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