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Differential D13784 Diff 40220 stand/i386/libi386/bioscd.c

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stand/i386/libi386/bioscd.c

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static struct bcinfo { static struct bcinfo {
int bc_unit; /* BIOS unit number */ int bc_unit; /* BIOS unit number */
struct specification_packet bc_sp; struct specification_packet bc_sp;
int bc_open; /* reference counter */ int bc_open; /* reference counter */
void *bc_bcache; /* buffer cache data */ void *bc_bcache; /* buffer cache data */
} bcinfo [MAXBCDEV]; } bcinfo [MAXBCDEV];
static int nbcinfo = 0; static int nbcinfo = 0;
#define BC(dev) (bcinfo[(dev)->d_unit]) #define BC(dev) (bcinfo[(dev)->dd.d_unit])
static int bc_read(int unit, daddr_t dblk, int blks, caddr_t dest); static int bc_read(int unit, daddr_t dblk, int blks, caddr_t dest);
static int bc_init(void); static int bc_init(void);
static int bc_strategy(void *devdata, int flag, daddr_t dblk, static int bc_strategy(void *devdata, int flag, daddr_t dblk,
size_t size, char *buf, size_t *rsize); size_t size, char *buf, size_t *rsize);
static int bc_realstrategy(void *devdata, int flag, daddr_t dblk, static int bc_realstrategy(void *devdata, int flag, daddr_t dblk,
size_t size, char *buf, size_t *rsize); size_t size, char *buf, size_t *rsize);
static int bc_open(struct open_file *f, ...); static int bc_open(struct open_file *f, ...);
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bc_open(struct open_file *f, ...) bc_open(struct open_file *f, ...)
{ {
va_list ap; va_list ap;
struct i386_devdesc *dev; struct i386_devdesc *dev;
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 (dev->d_unit >= nbcinfo) { if (dev->dd.d_unit >= nbcinfo) {
DEBUG("attempt to open nonexistent disk"); DEBUG("attempt to open nonexistent disk");
return(ENXIO); return(ENXIO);
} }
BC(dev).bc_open++; BC(dev).bc_open++;
if (BC(dev).bc_bcache == NULL) if (BC(dev).bc_bcache == NULL)
BC(dev).bc_bcache = bcache_allocate(); BC(dev).bc_bcache = bcache_allocate();
return(0); return(0);
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#else #else
if (size % BIOSCD_SECSIZE) if (size % BIOSCD_SECSIZE)
return (EINVAL); return (EINVAL);
#endif #endif
if ((rw & F_MASK) != F_READ) if ((rw & F_MASK) != F_READ)
return(EROFS); return(EROFS);
dev = (struct i386_devdesc *)devdata; dev = (struct i386_devdesc *)devdata;
unit = dev->d_unit; unit = dev->dd.d_unit;
blks = size / BIOSCD_SECSIZE; blks = size / BIOSCD_SECSIZE;
if (dblk % (BIOSCD_SECSIZE / DEV_BSIZE) != 0) if (dblk % (BIOSCD_SECSIZE / DEV_BSIZE) != 0)
return (EINVAL); return (EINVAL);
dblk /= (BIOSCD_SECSIZE / DEV_BSIZE); dblk /= (BIOSCD_SECSIZE / DEV_BSIZE);
DEBUG("read %d from %lld to %p", blks, dblk, buf); DEBUG("read %d from %lld to %p", blks, dblk, buf);
if (rsize) if (rsize)
*rsize = 0; *rsize = 0;
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*/ */
int int
bc_getdev(struct i386_devdesc *dev) bc_getdev(struct i386_devdesc *dev)
{ {
int biosdev, unit; int biosdev, unit;
int major; int major;
int rootdev; int rootdev;
unit = dev->d_unit; unit = dev->dd.d_unit;
biosdev = bc_unit2bios(unit); biosdev = bc_unit2bios(unit);
DEBUG("unit %d BIOS device %d", unit, biosdev); DEBUG("unit %d BIOS device %d", unit, biosdev);
if (biosdev == -1) /* not a BIOS device */ if (biosdev == -1) /* not a BIOS device */
return(-1); return(-1);
/* /*
* XXX: Need to examine device spec here to figure out if SCSI or * XXX: Need to examine device spec here to figure out if SCSI or
* ATAPI. No idea on how to figure out device number. All we can * ATAPI. No idea on how to figure out device number. All we can
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