Initial source

1 files changed, 624 insertions, 0 deletions

diff --git a/scsi/scsi_disk.c b/scsi/scsi_disk.c
new file mode 100644
index 0000000..99bbe76
--- /dev/null
+++ b/scsi/scsi_disk.c
@@ -0,0 +1,624 @@
+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File: scsi_disk.c
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	10/90
+ *
+ *	Middle layer of the SCSI driver: SCSI protocol implementation
+ *
+ * This file contains code for SCSI commands for DISK devices.
+ */
+
+#include <string.h>
+
+#include <mach/std_types.h>
+#include <scsi/compat_30.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi2.h>
+#include <scsi/scsi_defs.h>
+
+#if  (NSCSI > 0)
+
+
+char *scdisk_name(internal)
+	boolean_t	internal;
+{
+	return internal ? "rz" : "disk";
+}
+
+/*
+ * SCSI commands partially specific to disks
+ */
+void scdisk_read( tgt, secno, ior)
+	register target_info_t	*tgt;
+	register unsigned int	secno;
+	io_req_t		ior;
+{
+	scsi_cmd_read_t		*cmd;
+	register unsigned	len;
+	unsigned int		max_dma_data;
+
+	max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
+
+	len = ior->io_count;
+	if (len > max_dma_data)
+		len = max_dma_data;
+	if (len < tgt->block_size)
+		len = tgt->block_size;
+
+	cmd = (scsi_cmd_read_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_READ;
+	cmd->scsi_cmd_lun_and_lba1 = (secno>>16)&SCSI_LBA_MASK;
+	cmd->scsi_cmd_lba2 	   = (secno>> 8)&0xff;
+	cmd->scsi_cmd_lba3 	   = (secno    )&0xff;
+	cmd->scsi_cmd_xfer_len     = len / tgt->block_size;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	tgt->cur_cmd = SCSI_CMD_READ;
+
+	scsi_go(tgt, sizeof(*cmd), len, FALSE);
+}
+
+void scdisk_write( tgt, secno, ior)
+	register target_info_t	*tgt;
+	register unsigned int	secno;
+	io_req_t		ior;
+{
+	scsi_cmd_write_t	*cmd;
+	unsigned		len;	/* in bytes */
+	unsigned int		max_dma_data;
+
+	max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
+
+	len = ior->io_count;
+	if (len > max_dma_data)
+		len = max_dma_data;
+	if (len < tgt->block_size)
+		len = tgt->block_size;
+
+	cmd = (scsi_cmd_write_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_WRITE;
+	cmd->scsi_cmd_lun_and_lba1 = (secno>>16)&SCSI_LBA_MASK;
+	cmd->scsi_cmd_lba2 	   = (secno>> 8)&0xff;
+	cmd->scsi_cmd_lba3 	   = (secno    )&0xff;
+	cmd->scsi_cmd_xfer_len     = len / tgt->block_size;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	tgt->cur_cmd = SCSI_CMD_WRITE;
+
+	scsi_go(tgt, sizeof(*cmd), 0, FALSE);
+}
+
+
+int scdisk_mode_select(tgt, lbn, ior, mdata, mlen, save)
+	register target_info_t	*tgt;
+	register int 		lbn;
+	io_req_t		ior;
+	char			*mdata;
+	int mlen, save;
+{
+	scsi_cmd_mode_select_t	*cmd;
+	scsi_mode_select_param_t	*parm;
+
+	bzero(tgt->cmd_ptr, sizeof(*cmd) + sizeof(*parm));
+	cmd = (scsi_cmd_mode_select_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_MODE_SELECT;
+	cmd->scsi_cmd_lun_and_lba1 = SCSI_CMD_MSL_PF;	/* XXX only if... */
+	cmd->scsi_cmd_xfer_len = sizeof(scsi_mode_select_param_t);/* no vuq */
+
+	parm = (scsi_mode_select_param_t*) (cmd + 1);
+	if (mdata) {
+		cmd->scsi_cmd_xfer_len = mlen;
+		bcopy(mdata, (char*)parm, mlen);
+		if (save)
+			cmd->scsi_cmd_lun_and_lba1 |= SCSI_CMD_MSL_SP;
+	} else {
+	 	/* parm->medium_type = if (floppy)disk.. */
+		parm->desc_len = 8;
+		/* this really is the LBN */
+		parm->descs[0].density_code = 0;/* XXX default XXX */
+		parm->descs[0].reclen1 = (lbn>>16)&0xff;
+		parm->descs[0].reclen2 = (lbn>> 8)&0xff;
+		parm->descs[0].reclen3 = (lbn    )&0xff;
+		mlen = sizeof(*parm);
+	}
+
+	tgt->cur_cmd = SCSI_CMD_MODE_SELECT;
+
+	scsi_go_and_wait(tgt, sizeof(*cmd) + mlen, 0, ior);
+
+	return tgt->done;
+}
+
+/*
+ * SCSI commands fully specific to disks
+ */
+int scsi_read_capacity( tgt, lbn, ior)
+	register target_info_t	*tgt;
+	int			lbn;
+	io_req_t		ior;
+{
+	scsi_cmd_read_capacity_t	*cmd;
+
+	bzero(tgt->cmd_ptr, sizeof(*cmd));
+	cmd = (scsi_cmd_read_capacity_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_READ_CAPACITY;
+	/* all zeroes, unless... */
+	if (lbn) {
+		cmd->scsi_cmd_rcap_flags = SCSI_CMD_RCAP_PMI;
+		cmd->scsi_cmd_lba1 = (lbn>>24);
+		cmd->scsi_cmd_lba2 = (lbn>>16)&0xff;
+		cmd->scsi_cmd_lba3 = (lbn>> 8)&0xff;
+		cmd->scsi_cmd_lba4 = (lbn    )&0xff;
+	}
+	
+	tgt->cur_cmd = SCSI_CMD_READ_CAPACITY;
+
+	scsi_go_and_wait(tgt, sizeof(*cmd), sizeof(scsi_rcap_data_t),ior);
+
+	return tgt->done;
+}
+
+void scsi_reassign_blocks( tgt, defect_list, n_defects, ior)
+	register target_info_t	*tgt;
+	unsigned int		*defect_list;	/* In ascending order ! */
+	int			n_defects;
+	io_req_t		ior;
+{
+	scsi_cmd_reassign_blocks_t	*cmd;
+	scsi_Ldefect_data_t		*parm;
+
+	cmd = (scsi_cmd_reassign_blocks_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_REASSIGN_BLOCKS;
+	cmd->scsi_cmd_lun_and_lba1 = 0;
+	cmd->scsi_cmd_lba2 	   = 0;
+	cmd->scsi_cmd_lba3 	   = 0;
+	cmd->scsi_cmd_xfer_len     = 0;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+
+	parm = (scsi_Ldefect_data_t *) (cmd + 1);
+	parm->res1 = parm->res2 = 0;
+	n_defects *= 4;	/* in 4-byte-ints */
+	parm->list_len_msb = n_defects >> 8;
+	parm->list_len_lsb = n_defects;
+	bcopy((char*)defect_list, (char*)parm->defects, n_defects);
+
+	tgt->cur_cmd = SCSI_CMD_REASSIGN_BLOCKS;
+
+	scsi_go(tgt, sizeof(*cmd) + sizeof(*parm) + (n_defects - 4), 0, FALSE);
+}
+
+void scsi_medium_removal( tgt, allow, ior)
+	register target_info_t	*tgt;
+	boolean_t		allow;
+	io_req_t		ior;
+{
+	scsi_cmd_medium_removal_t	*cmd;
+
+	cmd = (scsi_cmd_medium_removal_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_PREVENT_ALLOW_REMOVAL;
+	cmd->scsi_cmd_lun_and_lba1 = 0;
+	cmd->scsi_cmd_lba2 	   = 0;
+	cmd->scsi_cmd_lba3 	   = 0;
+	cmd->scsi_cmd_pa_prevent   = allow ? 0 : 1;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+
+
+	tgt->cur_cmd = SCSI_CMD_PREVENT_ALLOW_REMOVAL;
+
+	scsi_go_and_wait(tgt, sizeof(*cmd), 0, ior);
+}
+
+int scsi_format_unit( tgt, mode, vuqe, intlv, ior)
+	register target_info_t	*tgt;
+	int mode, vuqe;
+	register unsigned int	intlv;
+	io_req_t		ior;
+{
+	scsi_cmd_format_t	*cmd;
+	char			*parms;
+
+	cmd = (scsi_cmd_format_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_FORMAT_UNIT;
+	cmd->scsi_cmd_lun_and_lba1 =
+		mode & (SCSI_CMD_FMT_FMTDATA|SCSI_CMD_FMT_CMPLIST|SCSI_CMD_FMT_LIST_TYPE);
+	cmd->scsi_cmd_lba2 	   = vuqe;
+	cmd->scsi_cmd_lba3 	   = intlv >>  8;
+	cmd->scsi_cmd_xfer_len     = intlv;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+
+	parms = (char*) cmd + 1;
+	if (ior->io_count)
+		bcopy(ior->io_data, parms, ior->io_count);
+	else
+		bzero(parms, 0xff - sizeof(*cmd));
+
+	tgt->cur_cmd = SCSI_CMD_FORMAT_UNIT;
+
+	scsi_go_and_wait(tgt, sizeof(*cmd) + ior->io_count, 0, ior);
+	return tgt->done;
+}
+
+
+/* Group 1 Commands */
+
+void scsi_long_read( tgt, secno, ior)
+	register target_info_t	*tgt;
+	register unsigned int	secno; 
+	io_req_t		ior;
+{
+	scsi_cmd_long_read_t	*cmd;
+	register unsigned	len, n_blks;
+	unsigned int		max_dma_data;
+
+	max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
+
+	len = ior->io_count;
+	if (len > max_dma_data)
+		len = max_dma_data;
+	if (len < tgt->block_size)
+		len = tgt->block_size;
+	n_blks = len /tgt->block_size;
+
+	cmd = (scsi_cmd_long_read_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_LONG_READ;
+	cmd->scsi_cmd_lun_and_relbit = 0;
+	cmd->scsi_cmd_lba1	     = secno >> 24;
+	cmd->scsi_cmd_lba2	     = secno >> 16;
+	cmd->scsi_cmd_lba3	     = secno >>  8;
+	cmd->scsi_cmd_lba4	     = secno;
+	cmd->scsi_cmd_xxx	     = 0;
+	cmd->scsi_cmd_xfer_len_1     = n_blks >> 8;
+	cmd->scsi_cmd_xfer_len_2     = n_blks;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	tgt->cur_cmd = SCSI_CMD_LONG_READ;
+
+	scsi_go(tgt, sizeof(*cmd), len, FALSE);
+}
+
+void scsi_long_write( tgt, secno, ior)
+	register target_info_t	*tgt;
+	register unsigned int	secno;
+	io_req_t		ior;
+{
+	scsi_cmd_long_write_t	*cmd;
+	unsigned		len;	/* in bytes */
+	unsigned int		max_dma_data, n_blks;
+
+	max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
+
+	len = ior->io_count;
+	if (len > max_dma_data)
+		len = max_dma_data;
+	if (len < tgt->block_size)
+		len = tgt->block_size;
+	n_blks = len /tgt->block_size;
+
+	cmd = (scsi_cmd_long_write_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_LONG_WRITE;
+	cmd->scsi_cmd_lun_and_relbit = 0;
+	cmd->scsi_cmd_lba1	     = secno >> 24;
+	cmd->scsi_cmd_lba2	     = secno >> 16;
+	cmd->scsi_cmd_lba3	     = secno >>  8;
+	cmd->scsi_cmd_lba4	     = secno;
+	cmd->scsi_cmd_xxx	     = 0;
+	cmd->scsi_cmd_xfer_len_1     = n_blks >> 8;
+	cmd->scsi_cmd_xfer_len_2     = n_blks;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	tgt->cur_cmd = SCSI_CMD_LONG_WRITE;
+
+	scsi_go(tgt, sizeof(*cmd), 0, FALSE);
+}
+
+int scdisk_verify( tgt, secno, nsectrs, ior)
+	register target_info_t	*tgt;
+	int secno, nsectrs;
+	io_req_t		ior;
+{
+	scsi_cmd_verify_long_t	*cmd;
+	int			len;
+
+	len = ior->io_count;
+
+	cmd = (scsi_cmd_verify_long_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_VERIFY_1;
+	cmd->scsi_cmd_lun_and_relbit = len ? SCSI_CMD_VFY_BYTCHK : 0;
+	cmd->scsi_cmd_lba1	     = secno >> 24;
+	cmd->scsi_cmd_lba2	     = secno >> 16;
+	cmd->scsi_cmd_lba3	     = secno >>  8;
+	cmd->scsi_cmd_lba4	     = secno;
+	cmd->scsi_cmd_xxx	     = 0;
+	cmd->scsi_cmd_xfer_len_1     = (nsectrs) >> 8;
+	cmd->scsi_cmd_xfer_len_2     = nsectrs;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	tgt->cur_cmd = SCSI_CMD_VERIFY_1;
+
+	scsi_go_and_wait(tgt, sizeof(*cmd) + len, 0, ior);
+	return tgt->done;
+}
+
+
+int scsi_read_defect( tgt, mode, ior)
+	register target_info_t	*tgt;
+	register unsigned int	mode; 
+	io_req_t		ior;
+{
+	scsi_cmd_long_read_t	*cmd;
+	register unsigned	len;
+
+	len = ior->io_count;
+	if (len > 0xffff)
+		len = 0xffff;
+
+	cmd = (scsi_cmd_read_defect_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_READ_DEFECT_DATA;
+	cmd->scsi_cmd_lun_and_relbit = 0;
+	cmd->scsi_cmd_lba1	     = mode & 0x1f;
+	cmd->scsi_cmd_lba2	     = 0;
+	cmd->scsi_cmd_lba3	     = 0;
+	cmd->scsi_cmd_lba4	     = 0;
+	cmd->scsi_cmd_xxx	     = 0;
+	cmd->scsi_cmd_xfer_len_1     = (len) >> 8;
+	cmd->scsi_cmd_xfer_len_2     = (len);
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	/* ++ HACK Alert */
+/*	tgt->cur_cmd = SCSI_CMD_READ_DEFECT_DATA;*/
+	tgt->cur_cmd = SCSI_CMD_LONG_READ;
+	/* -- HACK Alert */
+
+	scsi_go(tgt, sizeof(*cmd), len, FALSE);
+	iowait(ior);
+	return tgt->done;
+}
+
+
+#if	0 /* unused commands */
+scsi_rezero_unit( tgt, ior)
+	register target_info_t	*tgt;
+	io_req_t		ior;
+{
+	scsi_cmd_rezero_t	*cmd;
+
+	cmd = (scsi_cmd_rezero_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_REZERO_UNIT;
+	cmd->scsi_cmd_lun_and_lba1 = 0;
+	cmd->scsi_cmd_lba2 	   = 0;
+	cmd->scsi_cmd_lba3 	   = 0;
+	cmd->scsi_cmd_xfer_len     = 0;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+
+
+	tgt->cur_cmd = SCSI_CMD_REZERO_UNIT;
+
+	scsi_go_and_wait(tgt, sizeof(*cmd), 0, ior);
+
+}
+
+scsi_seek( tgt, where, ior)
+	register target_info_t	*tgt;
+	register unsigned int	where;
+	io_req_t		ior;
+{
+	scsi_cmd_seek_t	*cmd;
+
+	cmd = (scsi_cmd_seek_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_SEEK;
+	cmd->scsi_cmd_lun_and_lba1 = (where >> 16) & 0x1f;
+	cmd->scsi_cmd_lba2 	   = where >>  8;
+	cmd->scsi_cmd_lba3 	   = where;
+	cmd->scsi_cmd_xfer_len     = 0;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+
+
+	tgt->cur_cmd = SCSI_CMD_SEEK;
+
+	scsi_go_and_wait(tgt, sizeof(*cmd), 0, ior);
+
+}
+
+scsi_reserve( tgt, len, id, mode, ior)
+	register target_info_t	*tgt;
+	register unsigned int	len;
+	unsigned char		id;
+	io_req_t		ior;
+{
+	scsi_cmd_reserve_t	*cmd;
+
+	cmd = (scsi_cmd_reserve_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_RESERVE;
+	cmd->scsi_cmd_lun_and_lba1 = mode & 0x1f;
+	cmd->scsi_cmd_reserve_id   = id;
+	cmd->scsi_cmd_extent_llen1 = len >>  8;
+	cmd->scsi_cmd_extent_llen2 = len;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+
+
+	tgt->cur_cmd = SCSI_CMD_RESERVE;
+
+	scsi_go_and_wait(tgt, sizeof(*cmd), 0, ior);
+
+}
+
+scsi_release( tgt, id, mode, ior)
+	register target_info_t	*tgt;
+	unsigned char		id, mode;
+	io_req_t		ior;
+{
+	scsi_cmd_release_t	*cmd;
+
+	cmd = (scsi_cmd_release_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_RELEASE;
+	cmd->scsi_cmd_lun_and_lba1 = mode & 0x1f;
+	cmd->scsi_cmd_reserve_id   = id;
+	cmd->scsi_cmd_lba3 	   = 0;
+	cmd->scsi_cmd_xfer_len     = 0;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+
+
+	tgt->cur_cmd = SCSI_CMD_RELEASE;
+
+	scsi_go_and_wait(tgt, sizeof(*cmd), 0, ior);
+
+}
+
+
+/* Group 1 Commands */
+
+scsi_long_seek( tgt, secno, ior)
+	register target_info_t	*tgt;
+	io_req_t		ior;
+{
+	scsi_cmd_long_seek_t	*cmd;
+
+	cmd = (scsi_cmd_long_seek_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_LONG_SEEK;
+	cmd->scsi_cmd_lun_and_relbit = 0;
+	cmd->scsi_cmd_lba1	     = secno >> 24;
+	cmd->scsi_cmd_lba2	     = secno >> 16;
+	cmd->scsi_cmd_lba3	     = secno >>  8;
+	cmd->scsi_cmd_lba4	     = secno;
+	cmd->scsi_cmd_xxx	     = 0;
+	cmd->scsi_cmd_xfer_len_1     = 0;
+	cmd->scsi_cmd_xfer_len_2     = 0;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	tgt->cur_cmd = SCSI_CMD_LONG_SEEK;
+
+	scsi_go(tgt, sizeof(*cmd), 0, FALSE);
+}
+
+scsi_write_verify( tgt, secno, ior)
+	register target_info_t	*tgt;
+	io_req_t		ior;
+{
+	scsi_cmd_write_vfy_t	*cmd;
+	unsigned		len;	/* in bytes */
+	unsigned int		max_dma_data, n_blks;
+
+	max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
+
+	len = ior->io_count;
+	if (len > max_dma_data)
+		len = max_dma_data;
+	if (len < tgt->block_size)
+		len = tgt->block_size;
+	n_blks = len / tgt->block_size;
+
+	cmd = (scsi_cmd_write_vfy_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_WRITE_AND_VERIFY;
+	cmd->scsi_cmd_lun_and_relbit = SCSI_CMD_VFY_BYTCHK;
+	cmd->scsi_cmd_lba1	     = secno >> 24;
+	cmd->scsi_cmd_lba2	     = secno >> 16;
+	cmd->scsi_cmd_lba3	     = secno >>  8;
+	cmd->scsi_cmd_lba4	     = secno;
+	cmd->scsi_cmd_xxx	     = 0;
+	cmd->scsi_cmd_xfer_len_1     = n_blks >> 8;
+	cmd->scsi_cmd_xfer_len_2     = n_blks;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	tgt->cur_cmd = SCSI_CMD_WRITE_AND_VERIFY;
+
+	scsi_go(tgt, sizeof(*cmd), 0, FALSE);
+}
+
+scsi_search_data( tgt, secno, how, flags, ior)
+	register target_info_t	*tgt;
+	io_req_t		ior;
+{
+	scsi_cmd_search_t	*cmd;
+	unsigned		len;	/* in bytes */
+	unsigned int		max_dma_data, n_blks;
+
+	max_dma_data = scsi_softc[(unsigned char)tgt->masterno]->max_dma_data;
+
+	if (how != SCSI_CMD_SEARCH_HIGH &&
+	    how != SCSI_CMD_SEARCH_EQUAL &&
+	    how != SCSI_CMD_SEARCH_LOW)
+		panic("scsi_search_data");
+
+	len = ior->io_count;
+	if (len > max_dma_data)
+		len = max_dma_data;
+	n_blks = len / tgt->block_size;
+
+	cmd = (scsi_cmd_search_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = how;
+	cmd->scsi_cmd_lun_and_relbit = flags & 0x1e;
+	cmd->scsi_cmd_lba1	     = secno >> 24;
+	cmd->scsi_cmd_lba2	     = secno >> 16;
+	cmd->scsi_cmd_lba3	     = secno >>  8;
+	cmd->scsi_cmd_lba4	     = secno;
+	cmd->scsi_cmd_xxx	     = 0;
+	cmd->scsi_cmd_xfer_len_1     = n_blks >> 8;
+	cmd->scsi_cmd_xfer_len_2     = n_blks;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	tgt->cur_cmd = how;
+
+	scsi_go(tgt, sizeof(*cmd), 0, FALSE);
+}
+
+
+scsi_set_limits( tgt, secno, nblocks, inhibit, ior)
+	register target_info_t	*tgt;
+	io_req_t		ior;
+{
+	scsi_cmd_set_limits_t	*cmd;
+
+	cmd = (scsi_cmd_set_limits_t*) (tgt->cmd_ptr);
+	cmd->scsi_cmd_code = SCSI_CMD_SET_LIMITS;
+	cmd->scsi_cmd_lun_and_relbit = inhibit & 0x3;
+	cmd->scsi_cmd_lba1	     = secno >> 24;
+	cmd->scsi_cmd_lba2	     = secno >> 16;
+	cmd->scsi_cmd_lba3	     = secno >>  8;
+	cmd->scsi_cmd_lba4	     = secno;
+	cmd->scsi_cmd_xxx	     = 0;
+	cmd->scsi_cmd_xfer_len_1     = nblocks >> 8;
+	cmd->scsi_cmd_xfer_len_2     = nblocks;
+	cmd->scsi_cmd_ctrl_byte = 0;	/* not linked */
+	
+	tgt->cur_cmd = SCSI_CMD_SET_LIMITS;
+
+	scsi_go(tgt, sizeof(*cmd), 0, FALSE);
+}
+
+
+#endif
+
+#ifdef	SCSI2
+scsi_lock_cache
+scsi_prefetch
+scsi_read_defect_data
+scsi_sync_cache
+scsi_write_same
+#endif	SCSI2
+#endif  /* NSCSI > 0 */