/*      $NetBSD: hppa.c,v 1.2 2019/05/07 04:35:31 thorpej Exp $ */

/*-
 * Copyright (c) 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Luke Mewburn of Wasabi Systems.
 *
 * 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: hppa.c,v 1.2 2019/05/07 04:35:31 thorpej Exp $");
#endif  /* !__lint */

/* We need the target disklabel.h, not the hosts one..... */
#ifdef HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#include <nbinclude/sys/disklabel.h>
#else
#include <sys/disklabel.h>
#endif
#include <sys/param.h>
#include <sys/stat.h>

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

#include "installboot.h"

#define HPPA_LABELOFFSET        512
#define HPPA_LABELSIZE          404 /* reserve 16 partitions */
#define HPPA_BOOT_BLOCK_SIZE    8192

static int hppa_clearboot(ib_params *);
static int hppa_setboot(ib_params *);

struct ib_mach ib_mach_hppa = {
        .name           =       "hppa",
        .setboot        =       hppa_setboot,
        .clearboot      =       hppa_clearboot,
        .editboot       =       no_editboot,
};

static int
hppa_clearboot(ib_params *params)
{
        char            bb[HPPA_BOOT_BLOCK_SIZE];
        int             retval, eol;
        ssize_t         rv;

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

        retval = 0;

        /* read disklabel on the target disk */
        rv = pread(params->fsfd, bb, sizeof bb, 0);
        if (rv == -1) {
                warn("Reading `%s'", params->filesystem);
                goto done;
        } else if (rv != sizeof bb) {
                warnx("Reading `%s': short read", params->filesystem);
                goto done;
        }

        /* clear header */
        memset(bb, 0, HPPA_LABELOFFSET);
        eol = HPPA_LABELOFFSET + HPPA_LABELSIZE;
        memset(&bb[eol], 0, sizeof bb - eol);

        if (params->flags & IB_VERBOSE) {
                printf("%slearing bootstrap\n",
                    (params->flags & IB_NOWRITE) ? "Not c" : "C");
        }
        if (params->flags & IB_NOWRITE) {
                retval = 1;
                goto done;
        }

        rv = pwrite(params->fsfd, bb, sizeof bb, 0);
        if (rv == -1) {
                warn("Writing `%s'", params->filesystem);
                goto done;
        } else if (rv != HPPA_BOOT_BLOCK_SIZE) {
                warnx("Writing `%s': short write", params->filesystem);
                goto done;
        } else
                retval = 1;

 done:
        return (retval);
}

static int
hppa_setboot(ib_params *params)
{
        struct stat     bootstrapsb;
        char            bb[HPPA_BOOT_BLOCK_SIZE];
        struct {
                char    l_off[HPPA_LABELOFFSET];
                struct disklabel l;
                char    l_pad[HPPA_BOOT_BLOCK_SIZE
                            - HPPA_LABELOFFSET - sizeof(struct disklabel)];
        } label;
        unsigned int    secsize, npart;
        int             retval;
        ssize_t         rv;

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

        retval = 0;

        /* read disklabel on the target disk */
        rv = pread(params->fsfd, &label, HPPA_BOOT_BLOCK_SIZE, 0);
        if (rv == -1) {
                warn("Reading `%s'", params->filesystem);
                goto done;
        } else if (rv != HPPA_BOOT_BLOCK_SIZE) {
                warnx("Reading `%s': short read", params->filesystem);
                goto done;
        }

        if (fstat(params->s1fd, &bootstrapsb) == -1) {
                warn("Examining `%s'", params->stage1);
                goto done;
        }
        if (!S_ISREG(bootstrapsb.st_mode)) {
                warnx("`%s' must be a regular file", params->stage1);
                goto done;
        }

        /* check if valid disklabel exists */
        secsize = be32toh(label.l.d_secsize);
        npart = be16toh(label.l.d_npartitions);
        if (label.l.d_magic != htobe32(DISKMAGIC) ||
            label.l.d_magic2 != htobe32(DISKMAGIC) ||
            secsize == 0 || secsize & (secsize - 1) ||
            npart > MAXMAXPARTITIONS) {
                warnx("No disklabel in `%s'", params->filesystem);

        /* then check if boot partition exists */
        } else if (npart < 1 || label.l.d_partitions[0].p_size == 0) {
                warnx("Partition `a' doesn't exist in %s", params->filesystem);

        /* check if the boot partition is below 2GB */
        } else if (be32toh(label.l.d_partitions[0].p_offset) +
            be32toh(label.l.d_partitions[0].p_size) >
            ((unsigned)2*1024*1024*1024) / secsize) {
                warnx("Partition `a' of `%s' exceeds 2GB boundary.",
                    params->filesystem);
                warnx("It won't boot since hppa PDC can handle only 2GB.");
                goto done;
        }

        /* read boot loader */
        memset(&bb, 0, sizeof bb);
        rv = read(params->s1fd, &bb, sizeof bb);
        if (rv == -1) {
                warn("Reading `%s'", params->stage1);
                goto done;
        }
        /* then, overwrite disklabel */
        memcpy(&bb[HPPA_LABELOFFSET], &label.l, HPPA_LABELSIZE);

        if (params->flags & IB_VERBOSE) {
                printf("Bootstrap start sector: %#x\n", 0);
                printf("Bootstrap byte count:   %#zx\n", rv);
                printf("%sriting bootstrap\n",
                    (params->flags & IB_NOWRITE) ? "Not w" : "W");
        }
        if (params->flags & IB_NOWRITE) {
                retval = 1;
                goto done;
        }

        /* write boot loader and disklabel into the target disk */
        rv = pwrite(params->fsfd, &bb, HPPA_BOOT_BLOCK_SIZE, 0);
        if (rv == -1) {
                warn("Writing `%s'", params->filesystem);
                goto done;
        } else if (rv != HPPA_BOOT_BLOCK_SIZE) {
                warnx("Writing `%s': short write", params->filesystem);
                goto done;
        } else
                retval = 1;

 done:
        return (retval);
}