Differential D4713 Diff 15067 sys/boot/i386/libi386/bioscd.c

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sys/boot/i386/libi386/bioscd.c

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/*		/*
* List of BIOS devices, translation from disk unit number to		* List of BIOS devices, translation from disk unit number to
* BIOS unit number.		* BIOS unit number.
*/		*/
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 */
		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])

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 offset, size_t size, char buf, size_t rsize);
		static int bc_realstrategy(void *devdata, int flag, daddr_t dblk,
		size_t offset, size_t size, char buf, size_t rsize);
static int bc_open(struct open_file *f, ...);		static int bc_open(struct open_file *f, ...);
static int bc_close(struct open_file *f);		static int bc_close(struct open_file *f);
static void bc_print(int verbose);		static void bc_print(int verbose);

struct devsw bioscd = {		struct devsw bioscd = {
"cd",		"cd",
DEVT_CD,		DEVT_CD,
bc_init,		bc_init,
▲ Show 20 Lines • Show All 56 Lines • ▼ Show 20 Lines	bc_add(int biosdev)
v86.ds = VTOPSEG(&bcinfo[nbcinfo].bc_sp);		v86.ds = VTOPSEG(&bcinfo[nbcinfo].bc_sp);
v86.esi = VTOPOFF(&bcinfo[nbcinfo].bc_sp);		v86.esi = VTOPOFF(&bcinfo[nbcinfo].bc_sp);
v86int();		v86int();
if ((v86.eax & 0xff00) != 0)		if ((v86.eax & 0xff00) != 0)
return (-1);		return (-1);

printf("BIOS CD is cd%d\n", nbcinfo);		printf("BIOS CD is cd%d\n", nbcinfo);
nbcinfo++;		nbcinfo++;
		bcache_add_dev(nbcinfo); /* register cd device in bcache */
return(0);		return(0);
}		}

/*		/*
* Print information about disks		* Print information about disks
*/		*/
static void		static void
bc_print(int verbose)		bc_print(int verbose)
Show All 20 Lines	bc_open(struct open_file *f, ...)
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->d_unit >= nbcinfo) {
DEBUG("attempt to open nonexistent disk");		DEBUG("attempt to open nonexistent disk");
return(ENXIO);		return(ENXIO);
}		}

		BC(dev).bc_open++;
		if (BC(dev).bc_bcache == NULL)
		BC(dev).bc_bcache = bcache_allocate();
return(0);		return(0);
}		}

static int		static int
bc_close(struct open_file *f)		bc_close(struct open_file *f)
{		{
		struct i386_devdesc *dev;

		dev = (struct i386_devdesc *)f->f_devdata;
		BC(dev).bc_open--;
		if (BC(dev).bc_open == 0) {
		bcache_free(BC(dev).bc_bcache);
		BC(dev).bc_bcache = NULL;
		}
return(0);		return(0);
}		}

static int		static int
bc_strategy(void devdata, int rw, daddr_t dblk, size_t size, char buf,		bc_strategy(void *devdata, int rw, daddr_t dblk, size_t offset, size_t size,
size_t *rsize)		char buf, size_t rsize)
		{
		struct bcache_devdata bcd;
		struct i386_devdesc *dev;

		dev = (struct i386_devdesc *)devdata;
		bcd.dv_strategy = bc_realstrategy;
		bcd.dv_devdata = devdata;
		bcd.dv_cache = BC(dev).bc_bcache;

		return (bcache_strategy(&bcd, rw, dblk, offset, size, buf, rsize));
		}

		static int
		bc_realstrategy(void *devdata, int rw, daddr_t dblk, size_t offset, size_t size,
		char buf, size_t rsize)
{		{
struct i386_devdesc *dev;		struct i386_devdesc *dev;
int unit;		int unit;
int blks;		int blks;
#ifdef BD_SUPPORT_FRAGS		#ifdef BD_SUPPORT_FRAGS
char fragbuf[BIOSCD_SECSIZE];		char fragbuf[BIOSCD_SECSIZE];
size_t fragsize;		size_t fragsize;

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