/*      $NetBSD: dkwedge_apple.c,v 1.6 2020/04/11 16:00:34 jdolecek Exp $       */

/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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.
*/

/*
* Apple support for disk wedges
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dkwedge_apple.c,v 1.6 2020/04/11 16:00:34 jdolecek Exp $");

#include <sys/param.h>
#ifdef _KERNEL
#include <sys/systm.h>
#endif
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/disk.h>
#include <sys/vnode.h>
#include <sys/bitops.h>
#include <sys/buf.h>

#include <sys/bootblock.h>

#define SWAP16(x)       ap->x = be16toh(ap->x)
#define SWAP32(x)       ap->x = be32toh(ap->x)

#ifdef DKWEDGE_DEBUG
#define DPRINTF(fmt, ...)       printf(fmt, __VA_ARGS__)
#else
#define DPRINTF(fmt, ...)
#endif

static void
swap_apple_drvr_descriptor(struct apple_drvr_descriptor *ap)
{
       SWAP32(descBlock);
       SWAP16(descSize);
       SWAP16(descType);
}

static void
swap_apple_drvr_map(struct apple_drvr_map *ap)
{
       uint16_t i;

       SWAP16(sbSig);
       SWAP16(sbBlockSize);
       SWAP32(sbBlkCount);
       SWAP16(sbDevType);
       SWAP16(sbDevID);
       SWAP32(sbData);
       SWAP16(sbDrvrCount);

       if (ap->sbDrvrCount >= APPLE_DRVR_MAP_MAX_DESCRIPTORS)
               ap->sbDrvrCount = APPLE_DRVR_MAP_MAX_DESCRIPTORS;

       for (i = 0; i < ap->sbDrvrCount; i++)
               swap_apple_drvr_descriptor(&ap->sb_dd[i]);
}

static void
swap_apple_part_map_entry(struct apple_part_map_entry *ap)
{
       SWAP16(pmSig);
       SWAP16(pmSigPad);
       SWAP32(pmMapBlkCnt);
       SWAP32(pmPyPartStart);
       SWAP32(pmPartBlkCnt);
       SWAP32(pmLgDataStart);
       SWAP32(pmDataCnt);
       SWAP32(pmPartStatus);
       SWAP32(pmLgBootStart);
       SWAP32(pmBootSize);
       SWAP32(pmBootLoad);
       SWAP32(pmBootLoad2);
       SWAP32(pmBootEntry);
       SWAP32(pmBootEntry2);
       SWAP32(pmBootCksum);
}

static void
swap_apple_blockzeroblock(struct apple_blockzeroblock *ap)
{
       SWAP32(bzbMagic);
       SWAP16(bzbBadBlockInode);
       SWAP16(bzbFlags);
       SWAP16(bzbReserved);
       SWAP32(bzbCreationTime);
       SWAP32(bzbMountTime);
       SWAP32(bzbUMountTime);
}

#undef SWAP16
#undef SWAP32

#define ASIZE   16384

static struct {
       const char *name;
       const char *type;
} map[] = {
       { APPLE_PART_TYPE_UNIX, DKW_PTYPE_SYSV },
       { APPLE_PART_TYPE_MAC, DKW_PTYPE_APPLEHFS },
};


static int
dkwedge_discover_apple(struct disk *pdk, struct vnode *vp)
{
       size_t i, n;
       int error;
       struct buf *bp;
       uint32_t blocksize, blockcount, offset, rsize;
       struct apple_drvr_map *am;
       struct apple_part_map_entry *ae;
       struct apple_blockzeroblock ab;
       const char *ptype;

       bp = geteblk(ASIZE);
       if ((error = dkwedge_read(pdk, vp, 0, bp->b_data, ASIZE)) != 0) {
               DPRINTF("%s: read @%u %d\n", __func__, 0, error);
               goto out;
       }

       am = bp->b_data;
       swap_apple_drvr_map(am);

       error = ESRCH;

       if (am->sbSig != APPLE_DRVR_MAP_MAGIC) {
               DPRINTF("%s: drvr magic %x != %x\n", __func__, am->sbSig,
                   APPLE_DRVR_MAP_MAGIC);
               goto out;
       }

       blocksize = am->sbBlockSize;

       rsize = 1 << (ilog2(MAX(sizeof(*ae), blocksize) - 1) + 1);
       if (ASIZE < rsize) {
               DPRINTF("%s: buffer too small %u < %u\n", __func__, ASIZE,
                   rsize);
               goto out;
       }

       /* XXX Clamp entries at 512 for now. */
       blockcount = am->sbBlkCount;
       if (blockcount > 512) {
               aprint_error("%s: WARNING: clamping number of blocks to "
                   "512 (was %u)\n", pdk->dk_name, blockcount);
               blockcount = 512;
       }

       ae = bp->b_data;
       offset = blocksize;
       for (n = 0; n < blockcount; n++, offset += rsize) {
               DPRINTF("%s: offset %x rsize %x\n", __func__, offset, rsize);
               if ((error = dkwedge_read(pdk, vp, offset / DEV_BSIZE,
                   bp->b_data, rsize)) != 0) {
                       DPRINTF("%s: read @%u %d\n", __func__, offset,
                           error);
                       goto out;
               }

               swap_apple_part_map_entry(ae);
               if (ae->pmSig != APPLE_PART_MAP_ENTRY_MAGIC) {
                       DPRINTF("%s: part magic %x != %x\n", __func__,
                           ae->pmSig, APPLE_PART_MAP_ENTRY_MAGIC);
                       break;
               }

               for (i = 0; i < __arraycount(map); i++)
                       if (strcasecmp(map[i].name, ae->pmPartType) == 0)
                               break;

               DPRINTF("%s: %s/%s PH=%u/%u LG=%u/%u\n", __func__,
                   ae->pmPartName, ae->pmPartType,
                   ae->pmPyPartStart, ae->pmPartBlkCnt,
                   ae->pmLgDataStart, ae->pmDataCnt);

               if (i == __arraycount(map))
                       continue;

               ptype = map[i].type;
               memcpy(&ab, ae->pmBootArgs, sizeof(ab));
               swap_apple_blockzeroblock(&ab);
               if (ab.bzbMagic == APPLE_BZB_MAGIC) {
                       if (ab.bzbType == APPLE_BZB_TYPESWAP)
                               ptype = DKW_PTYPE_SWAP;
               }

               struct dkwedge_info dkw;
               memset(&dkw, 0, sizeof(dkw));

               strlcpy(dkw.dkw_ptype, ptype, sizeof(dkw.dkw_ptype));
               strlcpy(dkw.dkw_parent, pdk->dk_name, sizeof(dkw.dkw_parent));
               dkw.dkw_offset = ae->pmPyPartStart;
               dkw.dkw_size = ae->pmPartBlkCnt;
               strlcpy(dkw.dkw_wname, ae->pmPartName, sizeof(dkw.dkw_wname));
               error = dkwedge_add(&dkw);
               if (error == EEXIST)
                       aprint_error("%s: wedge named '%s' already "
                           "exists, manual intervention required\n",
                           pdk->dk_name, dkw.dkw_wname);
               else if (error)
                       aprint_error("%s: error %d adding partition "
                           "%s type %s\n", pdk->dk_name, error,
                           ae->pmPartType, dkw.dkw_ptype);
       }

out:
       brelse(bp, 0);
       DPRINTF("%s: return %d\n", __func__, error);
       return error;
}

#ifdef _KERNEL
DKWEDGE_DISCOVERY_METHOD_DECL(APPLE, -5, dkwedge_discover_apple);
#endif

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