NetBSD/distrib/utils/sysinst/arch/acorn26/md.c

/*	$NetBSD: md.c,v 1.15 2003/11/30 14:36:44 dsl Exp $	*/

/*
 * Copyright 1997 Piermont Information Systems Inc.
 * All rights reserved.
 *
 * Based on code written by Philip A. Nelson for Piermont Information
 * Systems Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Piermont Information Systems Inc.
 * 4. The name of Piermont Information Systems Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/* md.c -- acorn26 machine specific routines */

#include <stdio.h>
#include <curses.h>
#include <unistd.h>
#include <fcntl.h>
#include <util.h>
#include <sys/types.h>
#include <sys/disklabel.h>
#include <sys/disklabel_acorn.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include "defs.h"
#include "md.h"
#include "msg_defs.h"
#include "menu_defs.h"
void backtowin(void);

static int
filecore_checksum(u_char *bootblock);

/*
 * static int filecore_checksum(u_char *bootblock)
 *
 * Calculates the filecore boot block checksum. This is used to validate
 * a filecore boot block on the disk.  If a boot block is validated then
 * it is used to locate the partition table. If the boot block is not
 * validated, it is assumed that the whole disk is NetBSD.
 *
 * The basic algorithm is:
 *
 *	for (each byte in block, excluding checksum) {
 *		sum += byte;
 *		if (sum > 255)
 *			sum -= 255;
 *	}
 *
 * That's equivalent to summing all of the bytes in the block
 * (excluding the checksum byte, of course), then calculating the
 * checksum as "cksum = sum - ((sum - 1) / 255) * 255)".  That
 * expression may or may not yield a faster checksum function,
 * but it's easier to reason about.
 *
 * Note that if you have a block filled with bytes of a single
 * value "X" (regardless of that value!) and calculate the cksum
 * of the block (excluding the checksum byte), you will _always_
 * end up with a checksum of X.  (Do the math; that can be derived
 * from the checksum calculation function!)  That means that
 * blocks which contain bytes which all have the same value will
 * always checksum properly.  That's a _very_ unlikely occurence
 * (probably impossible, actually) for a valid filecore boot block,
 * so we treat such blocks as invalid.
 */

static int
filecore_checksum(bootblock)
	u_char *bootblock;
{  
	u_char byte0, accum_diff;
	u_int sum;
	int i;
 
	sum = 0;
	accum_diff = 0;
	byte0 = bootblock[0];
 
	/*
	 * Sum the contents of the block, keeping track of whether
	 * or not all bytes are the same.  If 'accum_diff' ends up
	 * being zero, all of the bytes are, in fact, the same.
	 */
	for (i = 0; i < 511; ++i) {
		sum += bootblock[i];
		accum_diff |= bootblock[i] ^ byte0;
	}

	/*
	 * Check to see if the checksum byte is the same as the
	 * rest of the bytes, too.  (Note that if all of the bytes
	 * are the same except the checksum, a checksum compare
	 * won't succeed, but that's not our problem.)
	 */
	accum_diff |= bootblock[i] ^ byte0;

	/* All bytes in block are the same; call it invalid. */
	if (accum_diff == 0)
		return (-1);

	return (sum - ((sum - 1) / 255) * 255);
}

int
md_get_info(void)
{
	struct disklabel disklabel;
	int fd;
	char dev_name[100];
	static char bb[DEV_BSIZE];
	struct filecore_bootblock *fcbb = (struct filecore_bootblock *)bb;
	int offset = 0;

	if (strncmp(diskdev, "wd", 2) == 0)
		disktype = "ST506";
	else
		disktype = "SCSI";

	snprintf(dev_name, 100, "/dev/r%s%c", diskdev, 'a' + getrawpartition());

	fd = open(dev_name, O_RDONLY, 0);
	if (fd < 0) {
		endwin();
		fprintf(stderr, "Can't open %s\n", dev_name);
		exit(1);
	}
	if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) {
		endwin();
		fprintf(stderr, "Can't read disklabel on %s.\n", dev_name);
		close(fd);
		exit(1);
	}

	if (lseek(fd, (off_t)FILECORE_BOOT_SECTOR * DEV_BSIZE, SEEK_SET) < 0
	    || read(fd, bb, sizeof(bb)) < sizeof(bb)) {
		endwin();
		fprintf(stderr, msg_string(MSG_badreadbb));
		close(fd);
		exit(1);
	}

	/* Check if table is valid. */
	if (filecore_checksum(bb) == fcbb->checksum) {
		/*
		 * Check for NetBSD/arm32 (RiscBSD) partition marker.
		 * If found the NetBSD disklabel location is easy.
		 */

		offset = (fcbb->partition_cyl_low +
		    (fcbb->partition_cyl_high << 8)) *
		    fcbb->heads * fcbb->secspertrack;

		if (fcbb->partition_type == PARTITION_FORMAT_RISCBSD)
			;
		else if (fcbb->partition_type == PARTITION_FORMAT_RISCIX) {
			/*
     			 * Ok we need to read the RISCiX partition table and
			 * search for a partition named RiscBSD, NetBSD or
			 * Empty:
			 */

			struct riscix_partition_table *riscix_part =
			    (struct riscix_partition_table *)bb;
			struct riscix_partition *part;
			int loop;

			if (lseek(fd, (off_t)offset * DEV_BSIZE, SEEK_SET) < 0
			    || read(fd, bb, sizeof(bb)) < sizeof(bb)) {
				endwin();
				fprintf(stderr, msg_string(MSG_badreadriscix));
				close(fd);
				exit(1);
			}

			/* Break out as soon as we find a suitable partition */
			for (loop = 0; loop < NRISCIX_PARTITIONS; ++loop) {
				part = &riscix_part->partitions[loop];
				if (strcmp(part->rp_name, "RiscBSD") == 0
				    || strcmp(part->rp_name, "NetBSD") == 0
				    || strcmp(part->rp_name, "Empty:") == 0) {
					offset = part->rp_start;
					break;
				}
			}
			if (loop == NRISCIX_PARTITIONS) {
				/*
				 * Valid filecore boot block, RISCiX partition
				 * table but no NetBSD partition. We should
				 * leave this disc alone.
				 */
				endwin();
				fprintf(stderr, msg_string(MSG_notnetbsdriscix));
				close(fd);
				exit(1);
			}
		} else {
			/*
			 * Valid filecore boot block and no non-ADFS partition.
			 * This means that the whole disc is allocated for ADFS 
			 * so do not trash ! If the user really wants to put a
			 * NetBSD disklabel on the disc then they should remove
			 * the filecore boot block first with dd.
			 */
			endwin();
			fprintf(stderr, msg_string(MSG_notnetbsd));
			close(fd);
			exit(1);
		}
	}
	close(fd);
 
	dlcyl = disklabel.d_ncylinders;
	dlhead = disklabel.d_ntracks;
	dlsec = disklabel.d_nsectors;
	sectorsize = disklabel.d_secsize;
	dlcylsize = disklabel.d_secpercyl;

	/*
	 * Compute whole disk size. Take max of (dlcyl*dlhead*dlsec)
	 * and secperunit,  just in case the disk is already labelled.  
	 * (If our new label's RAW_PART size ends up smaller than the
	 * in-core RAW_PART size  value, updating the label will fail.)
	 */
	dlsize = dlcyl*dlhead*dlsec;
	if (disklabel.d_secperunit > dlsize)
		dlsize = disklabel.d_secperunit;

	ptstart = offset;
/*	endwin();
	printf("dlcyl=%d\n", dlcyl);
	printf("dlhead=%d\n", dlhead);
	printf("dlsec=%d\n", dlsec);
	printf("secsz=%d\n", sectorsize);
	printf("cylsz=%d\n", dlcylsize);
	printf("dlsz=%d\n", dlsize);
	printf("pstart=%d\n", ptstart);
	printf("pstart=%d\n", partsize);
	printf("secpun=%d\n", disklabel.d_secperunit);
	backtowin();*/

	return 1;
}

int
md_pre_disklabel(void)
{
	return 0;
}

int
md_post_disklabel(void)
{
	return 0;
}

int
md_post_newfs(void)
{
#if 0
	/* XXX boot blocks ... */
	printf(msg_string(MSG_dobootblks), diskdev);
	run_program(RUN_DISPLAY, "/sbin/disklabel -B %s /dev/r%sc",
	    "-b /usr/mdec/rzboot -s /usr/mdec/bootrz", diskdev);
#endif
	return 0;
}

int
md_copy_filesystem(void)
{
	return 0;
}

int
md_make_bsd_partitions(void)
{
	return make_bsd_partitions();
}

int
md_check_partitions(void)
{
	return 1;
}

/* Upgrade support */
int
md_update(void)
{
	move_aout_libs();
	endwin();
	md_copy_filesystem();
	md_post_newfs();
	wrefresh(curscr);
	wmove(stdscr, 0, 0);
	wclear(stdscr);
	wrefresh(stdscr);
	return 1;
}

void
md_cleanup_install(void)
{
#ifndef DEBUG
	enable_rc_conf();

	run_program(0, "rm -f %s", target_expand("/sysinst"));
	run_program(0, "rm -f %s", target_expand("/.termcap"));
	run_program(0, "rm -f %s", target_expand("/.profile"));
#endif
}

int
md_pre_update()
{
	return 1;
}

void
md_init()
{
}

void
md_set_sizemultname()
{

	set_sizemultname_meg();
}