/* $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