/* $NetBSD: next68k.c,v 1.10 2023/02/14 20:27:17 andvar Exp $ */

/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by David Laight and Christian Limpach.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 THE FOUNDATION OR CONTRIBUTORS
* 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.
*/

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if !defined(__lint)
__RCSID("$NetBSD: next68k.c,v 1.10 2023/02/14 20:27:17 andvar Exp $");
#endif /* !__lint */

#include <sys/param.h>

#include <assert.h>
#include <err.h>
#include <md5.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "installboot.h"

static uint16_t nextstep_checksum(const void *, const void *);
static int next68k_setboot(ib_params *);

struct ib_mach ib_mach_next68k = {
       .name           =       "next68k",
       .setboot        =       next68k_setboot,
       .clearboot      =       no_clearboot,
       .editboot       =       no_editboot,
};

static uint16_t
nextstep_checksum(const void *vbuf, const void *vlimit)
{
       const uint16_t *buf = vbuf;
       const uint16_t *limit = vlimit;
       u_int sum = 0;

       while (buf < limit) {
               sum += be16toh(*buf++);
       }
       sum += (sum >> 16);
       return (sum & 0xffff);
}

static int
next68k_setboot(ib_params *params)
{
       int retval, labelupdated;
       uint8_t *bootbuf;
       size_t bootsize;
       ssize_t rv;
       uint32_t cd_secsize;
       int sec_netonb_mult;
       struct next68k_disklabel *next68klabel;
       uint16_t *checksum;
       uint32_t fp, b0, b1;

       assert(params != NULL);
       assert(params->fsfd != -1);
       assert(params->filesystem != NULL);
       assert(params->s1fd != -1);
       assert(params->stage1 != NULL);

       retval = 0;
       labelupdated = 0;
       bootbuf = NULL;

       next68klabel = malloc(NEXT68K_LABEL_SIZE);
       if (next68klabel == NULL) {
               warn("Allocating %lu bytes", (unsigned long)NEXT68K_LABEL_SIZE);
               goto done;
       }

       /*
        * Read in the next68k disklabel
        */
       rv = pread(params->fsfd, next68klabel, NEXT68K_LABEL_SIZE,
           NEXT68K_LABEL_SECTOR * params->sectorsize + NEXT68K_LABEL_OFFSET);
       if (rv == -1) {
               warn("Reading `%s'", params->filesystem);
               goto done;
       }
       if (rv != NEXT68K_LABEL_SIZE) {
               warnx("Reading `%s': short read", params->filesystem);
               goto done;
       }
       if (be32toh(next68klabel->cd_version) == NEXT68K_LABEL_CD_V3) {
               checksum = &next68klabel->NEXT68K_LABEL_cd_v3_checksum;
       } else {
               checksum = &next68klabel->cd_checksum;
       }
       if (nextstep_checksum (next68klabel, checksum) !=
           be16toh(*checksum)) {
               warn("Disklabel checksum invalid on `%s'",
                   params->filesystem);
               goto done;
       }

       cd_secsize = be32toh(next68klabel->cd_secsize);
       sec_netonb_mult = (cd_secsize / params->sectorsize);

       /*
        * Allocate a buffer, with space to round up the input file
        * to the next block size boundary, and with space for the boot
        * block.
        */
       bootsize = roundup(params->s1stat.st_size, cd_secsize);

       bootbuf = malloc(bootsize);
       if (bootbuf == NULL) {
               warn("Allocating %zu bytes", bootsize);
               goto done;
       }
       memset(bootbuf, 0, bootsize);

       /*
        * Read the file into the buffer.
        */
       rv = pread(params->s1fd, bootbuf, params->s1stat.st_size, 0);
       if (rv == -1) {
               warn("Reading `%s'", params->stage1);
               goto done;
       } else if (rv != params->s1stat.st_size) {
               warnx("Reading `%s': short read", params->stage1);
               goto done;
       }

       if (bootsize > be16toh(next68klabel->cd_front) * cd_secsize -
           NEXT68K_LABEL_SIZE) {
               warnx("Boot program is larger than front porch space");
               goto done;
       }

       fp = be16toh(next68klabel->cd_front);
       b0 = be32toh(next68klabel->cd_boot_blkno[0]);
       b1 = be32toh(next68klabel->cd_boot_blkno[1]);

       if (b0 > fp)
               b0 = fp;
       if (b1 > fp)
               b1 = fp;
       if (((bootsize / cd_secsize) > b1 - b0) ||
           ((bootsize / cd_secsize) > fp - b1)) {
               if (2 * bootsize > (fp * cd_secsize - NEXT68K_LABEL_SIZE))
                       /* can only fit one copy */
                       b0 = b1 = NEXT68K_LABEL_SIZE / cd_secsize;
               else {
                       if (2 * bootsize > (fp * cd_secsize -
                               NEXT68K_LABEL_DEFAULTBOOT0_1 *
                               params->sectorsize))
                               /* can fit two copies starting after label */
                               b0 = NEXT68K_LABEL_SIZE / cd_secsize;
                       else
                               /* can fit two copies starting at default 1 */
                               b0 = NEXT68K_LABEL_DEFAULTBOOT0_1 /
                                       sec_netonb_mult;
                       /* try to fit 2nd copy at default 2 */
                       b1 = NEXT68K_LABEL_DEFAULTBOOT0_2 / sec_netonb_mult;
                       if (fp < b1)
                               b1 = fp;
                       if (bootsize / cd_secsize > (fp - b1))
                               /* fit 2nd copy before front porch */
                               b1 = fp - bootsize / cd_secsize;
               }
       }
       if (next68klabel->cd_boot_blkno[0] != (int32_t)htobe32(b0)) {
               next68klabel->cd_boot_blkno[0] = htobe32(b0);
               labelupdated = 1;
       }
       if (next68klabel->cd_boot_blkno[1] != (int32_t)htobe32(b1)) {
               next68klabel->cd_boot_blkno[1] = htobe32(b1);
               labelupdated = 1;
       }
       if (params->flags & IB_VERBOSE)
               printf("Boot program locations%s: %d %d\n",
                   labelupdated ? " updated" : "", b0 * sec_netonb_mult,
                   b1 * sec_netonb_mult);

       if (params->flags & IB_NOWRITE) {
               retval = 1;
               goto done;
       }

       /*
        * Write the updated next68k disklabel
        */
       if (labelupdated) {
               if (params->flags & IB_VERBOSE)
                       printf ("Writing updated label\n");
               *checksum = htobe16(nextstep_checksum (next68klabel,
                                       checksum));
               rv = pwrite(params->fsfd, next68klabel, NEXT68K_LABEL_SIZE,
                   NEXT68K_LABEL_SECTOR * params->sectorsize +
                   NEXT68K_LABEL_OFFSET);
               if (rv == -1) {
                       warn("Writing `%s'", params->filesystem);
                       goto done;
               }
               if (rv != NEXT68K_LABEL_SIZE) {
                       warnx("Writing `%s': short write", params->filesystem);
                       goto done;
               }
       }

       b0 *= sec_netonb_mult;
       b1 *= sec_netonb_mult;

       /*
        * Write boot program to locations b0 and b1 (if different).
        */
       for (;;) {
               if (params->flags & IB_VERBOSE)
                       printf ("Writing boot program at %d\n", b0);
               rv = pwrite(params->fsfd, bootbuf, bootsize,
                   b0 * params->sectorsize);
               if (rv == -1) {
                       warn("Writing `%s' at %d", params->filesystem, b0);
                       goto done;
               }
               if ((size_t)rv != bootsize) {
                       warnx("Writing `%s' at %d: short write",
                           params->filesystem, b0);
                       goto done;
               }
               if (b0 == b1)
                       break;
               b0 = b1;
       }

       retval = 1;

done:
       if (bootbuf)
               free(bootbuf);
       if (next68klabel)
               free(next68klabel);
       return retval;
}

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