245 lines
6.2 KiB
C
245 lines
6.2 KiB
C
/* $NetBSD: dkwedge_apple.c,v 1.2 2015/01/24 02:58:56 christos Exp $ */
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Apple support for disk wedges
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: dkwedge_apple.c,v 1.2 2015/01/24 02:58:56 christos Exp $");
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#include <sys/param.h>
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#ifdef _KERNEL
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#include <sys/systm.h>
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#endif
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#include <sys/proc.h>
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#include <sys/errno.h>
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#include <sys/disk.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/bitops.h>
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#include <sys/bootblock.h>
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#define SWAP16(x) ap->x = be16toh(ap->x)
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#define SWAP32(x) ap->x = be32toh(ap->x)
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#ifdef DKWEDGE_DEBUG
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#define DPRINTF(fmt, ...) printf(fmt, __VA_ARGS__)
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#else
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#define DPRINTF(fmt, ...)
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#endif
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static void
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swap_apple_drvr_descriptor(struct apple_drvr_descriptor *ap)
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{
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SWAP32(descBlock);
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SWAP16(descSize);
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SWAP16(descType);
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}
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static void
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swap_apple_drvr_map(struct apple_drvr_map *ap)
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{
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uint16_t i;
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SWAP16(sbSig);
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SWAP16(sbBlockSize);
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SWAP32(sbBlkCount);
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SWAP16(sbDevType);
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SWAP16(sbDevID);
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SWAP32(sbData);
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SWAP16(sbDrvrCount);
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if (ap->sbDrvrCount >= APPLE_DRVR_MAP_MAX_DESCRIPTORS)
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ap->sbDrvrCount = APPLE_DRVR_MAP_MAX_DESCRIPTORS;
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for (i = 0; i < ap->sbDrvrCount; i++)
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swap_apple_drvr_descriptor(&ap->sb_dd[i]);
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}
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static void
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swap_apple_part_map_entry(struct apple_part_map_entry *ap)
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{
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SWAP16(pmSig);
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SWAP16(pmSigPad);
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SWAP32(pmMapBlkCnt);
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SWAP32(pmPyPartStart);
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SWAP32(pmPartBlkCnt);
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SWAP32(pmLgDataStart);
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SWAP32(pmDataCnt);
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SWAP32(pmPartStatus);
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SWAP32(pmLgBootStart);
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SWAP32(pmBootSize);
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SWAP32(pmBootLoad);
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SWAP32(pmBootLoad2);
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SWAP32(pmBootEntry);
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SWAP32(pmBootEntry2);
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SWAP32(pmBootCksum);
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}
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static void
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swap_apple_blockzeroblock(struct apple_blockzeroblock *ap)
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{
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SWAP32(bzbMagic);
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SWAP16(bzbBadBlockInode);
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SWAP16(bzbFlags);
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SWAP16(bzbReserved);
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SWAP32(bzbCreationTime);
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SWAP32(bzbMountTime);
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SWAP32(bzbUMountTime);
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}
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#undef SWAP16
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#undef SWAP32
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#define ASIZE 16384
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#ifdef _KERNEL
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#define DKW_MALLOC(SZ) malloc((SZ), M_DEVBUF, M_WAITOK)
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#define DKW_FREE(PTR) free((PTR), M_DEVBUF)
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#else
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#define DKW_MALLOC(SZ) malloc((SZ))
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#define DKW_FREE(PTR) free((PTR))
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#endif
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static struct {
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const char *name;
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const char *type;
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} map[] = {
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{ APPLE_PART_TYPE_UNIX, DKW_PTYPE_SYSV },
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{ APPLE_PART_TYPE_MAC, DKW_PTYPE_APPLEHFS },
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};
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static int
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dkwedge_discover_apple(struct disk *pdk, struct vnode *vp)
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{
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size_t i;
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int error;
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void *buf;
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uint32_t blocksize, offset, rsize;
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struct apple_drvr_map *am;
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struct apple_part_map_entry *ae;
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struct apple_blockzeroblock ab;
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const char *ptype;
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buf = DKW_MALLOC(ASIZE);
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if ((error = dkwedge_read(pdk, vp, 0, buf, ASIZE)) != 0) {
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DPRINTF("%s: read @%u %d\n", __func__, 0, error);
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goto out;
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}
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am = buf;
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swap_apple_drvr_map(am);
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error = ESRCH;
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if (am->sbSig != APPLE_DRVR_MAP_MAGIC) {
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DPRINTF("%s: drvr magic %x != %x\n", __func__, am->sbSig,
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APPLE_DRVR_MAP_MAGIC);
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goto out;
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}
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blocksize = am->sbBlockSize;
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rsize = 1 << (ilog2(MAX(sizeof(*ae), blocksize) - 1) + 1);
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if (ASIZE < rsize) {
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DPRINTF("%s: buffer too small %u < %u\n", __func__, ASIZE,
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rsize);
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goto out;
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}
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ae = buf;
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for (offset = blocksize;; offset += rsize) {
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DPRINTF("%s: offset %x rsize %x\n", __func__, offset, rsize);
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if ((error = dkwedge_read(pdk, vp, offset / DEV_BSIZE, buf,
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rsize)) != 0) {
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DPRINTF("%s: read @%u %d\n", __func__, offset,
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error);
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goto out;
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}
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swap_apple_part_map_entry(ae);
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if (ae->pmSig != APPLE_PART_MAP_ENTRY_MAGIC) {
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DPRINTF("%s: part magic %x != %x\n", __func__,
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ae->pmSig, APPLE_PART_MAP_ENTRY_MAGIC);
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break;
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}
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for (i = 0; i < __arraycount(map); i++)
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if (strcasecmp(map[i].name, ae->pmPartType) == 0)
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break;
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DPRINTF("%s: %s/%s PH=%u/%u LG=%u/%u\n", __func__,
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ae->pmPartName, ae->pmPartType,
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ae->pmPyPartStart, ae->pmPartBlkCnt,
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ae->pmLgDataStart, ae->pmDataCnt);
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if (i == __arraycount(map))
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continue;
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ptype = map[i].type;
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memcpy(&ab, ae->pmBootArgs, sizeof(ab));
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swap_apple_blockzeroblock(&ab);
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if (ab.bzbMagic == APPLE_BZB_MAGIC) {
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if (ab.bzbType == APPLE_BZB_TYPESWAP)
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ptype = DKW_PTYPE_SWAP;
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}
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struct dkwedge_info dkw;
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strcpy(dkw.dkw_ptype, ptype);
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strcpy(dkw.dkw_parent, pdk->dk_name);
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dkw.dkw_offset = ae->pmPyPartStart;
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dkw.dkw_size = ae->pmPartBlkCnt;
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strlcpy(dkw.dkw_wname, ae->pmPartName, sizeof(dkw.dkw_wname));
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error = dkwedge_add(&dkw);
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if (error == EEXIST)
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aprint_error("%s: wedge named '%s' already "
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"exists, manual intervention required\n",
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pdk->dk_name, dkw.dkw_wname);
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else if (error)
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aprint_error("%s: error %d adding partition "
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"%s type %s\n", pdk->dk_name, error,
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ae->pmPartType, dkw.dkw_ptype);
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}
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out:
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DKW_FREE(buf);
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DPRINTF("%s: return %d\n", __func__, error);
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return error;
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}
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#ifdef _KERNEL
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DKWEDGE_DISCOVERY_METHOD_DECL(APPLE, -5, dkwedge_discover_apple);
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#endif
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