Differential D18723 Diff 52497 stand/i386/libi386/biosdisk.c

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stand/i386/libi386/biosdisk.c

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static int bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size,		static int bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size,
char buf, size_t rsize);		char buf, size_t rsize);
static int bd_open(struct open_file *f, ...);		static int bd_open(struct open_file *f, ...);
static int bd_close(struct open_file *f);		static int bd_close(struct open_file *f);
static int bd_ioctl(struct open_file f, u_long cmd, void data);		static int bd_ioctl(struct open_file f, u_long cmd, void data);
static int bd_print(int verbose);		static int bd_print(int verbose);
static int cd_print(int verbose);		static int cd_print(int verbose);
static int fd_print(int verbose);		static int fd_print(int verbose);
		static void bd_reset_disk(int);
		static int bd_get_diskinfo_std(struct bdinfo *);

struct devsw biosfd = {		struct devsw biosfd = {
.dv_name = "fd",		.dv_name = "fd",
.dv_type = DEVT_FD,		.dv_type = DEVT_FD,
.dv_init = fd_init,		.dv_init = fd_init,
.dv_strategy = bd_strategy,		.dv_strategy = bd_strategy,
.dv_open = bd_open,		.dv_open = bd_open,
.dv_close = bd_close,		.dv_close = bd_close,
▲ Show 20 Lines • Show All 100 Lines • ▼ Show 20 Lines	STAILQ_FOREACH(bd, bdi, bd_link) {
if (unit == dev->dd.d_unit)		if (unit == dev->dd.d_unit)
return (bd->bd_unit);		return (bd->bd_unit);
unit++;		unit++;
}		}
return (-1);		return (-1);
}		}

/*		/*
		* Use INT13 AH=15 - Read Drive Type.
		*/
		static int
		fd_count(void)
		{
		int drive;

		for (drive = 0; drive < MAXBDDEV; drive++) {
		bd_reset_disk(drive);

		v86.ctl = V86_FLAGS;
		v86.addr = 0x13;
		v86.eax = 0x1500;
		v86.edx = drive;
		v86int();

		if (V86_CY(v86.efl))
		break;

		if ((v86.eax & 0x300) == 0)
		break;
		}

		return (drive);
		}

		/*
* Quiz the BIOS for disk devices, save a little info about them.		* Quiz the BIOS for disk devices, save a little info about them.
*/		*/
static int		static int
fd_init(void)		fd_init(void)
{		{
int unit;		int unit, numfd;
bdinfo_t *bd;		bdinfo_t *bd;

for (unit = 0; unit < MAXBDDEV; unit++) {		numfd = fd_count();
		for (unit = 0; unit < numfd; unit++) {
if ((bd = calloc(1, sizeof(*bd))) == NULL)		if ((bd = calloc(1, sizeof(*bd))) == NULL)
break;		break;

		bd->bd_sectorsize = BIOSDISK_SECSIZE;
bd->bd_flags = BD_FLOPPY;		bd->bd_flags = BD_FLOPPY;
bd->bd_unit = unit;		bd->bd_unit = unit;
if (!bd_int13probe(bd)) {
		/* Use std diskinfo for floppy drive */
		if (bd_get_diskinfo_std(bd) != 0) {
free(bd);		free(bd);
break;		break;
}		}
if (bd->bd_sectors == 0)		if (bd->bd_sectors == 0)
bd->bd_flags \|= BD_NO_MEDIA;		bd->bd_flags \|= BD_NO_MEDIA;

printf("BIOS drive %c: is %s%d\n", ('A' + unit),		printf("BIOS drive %c: is %s%d\n", ('A' + unit),
biosfd.dv_name, unit);		biosfd.dv_name, unit);
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}		}

/*		/*
* Return EDD version or 0 if EDD is not supported on this drive.		* Return EDD version or 0 if EDD is not supported on this drive.
*/		*/
static int		static int
bd_check_extensions(int unit)		bd_check_extensions(int unit)
{		{
		/* do not use ext calls for floppy devices */
		if (unit < 0x80)
		return (0);

/* Determine if we can use EDD with this device. */		/* Determine if we can use EDD with this device. */
v86.ctl = V86_FLAGS;		v86.ctl = V86_FLAGS;
v86.addr = 0x13;		v86.addr = 0x13;
v86.eax = 0x4100;		v86.eax = 0x4100;
v86.edx = unit;		v86.edx = unit;
v86.ebx = 0x55aa;		v86.ebx = 0x55aa;
v86int();		v86int();

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