/* $NetBSD: biosdisk.c,v 1.43.4.1 2015/01/20 09:45:20 martin Exp $ */ /* * Copyright (c) 1996, 1998 * Matthias Drochner. All rights reserved. * * 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 AUTHOR ``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 AUTHOR 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. * */ /* * raw BIOS disk device for libsa. * needs lowlevel parts from bios_disk.S and biosdisk_ll.c * partly from netbsd:sys/arch/i386/boot/disk.c * no bad144 handling! * * A lot of this must match sys/kern/subr_disk_mbr.c */ /* * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 * * Mach Operating System * Copyright (c) 1992, 1991 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ #if !defined(NO_DISKLABEL) || !defined(NO_GPT) #define FSTYPENAMES #endif #include #include #include #include #include #include #include #include #include #include #include #include "libi386.h" #include "biosdisk_ll.h" #include "biosdisk.h" #ifdef _STANDALONE #include "bootinfo.h" #endif #define BUFSIZE 2048 /* must be large enough for a CD sector */ #define BIOSDISKNPART 26 struct biosdisk { struct biosdisk_ll ll; daddr_t boff; char buf[BUFSIZE]; #if !defined(NO_DISKLABEL) || !defined(NO_GPT) struct { daddr_t offset; daddr_t size; int fstype; } part[BIOSDISKNPART]; #endif }; #ifndef NO_GPT const struct uuid GET_nbsd_raid = GPT_ENT_TYPE_NETBSD_RAIDFRAME; const struct uuid GET_nbsd_ffs = GPT_ENT_TYPE_NETBSD_FFS; const struct uuid GET_nbsd_lfs = GPT_ENT_TYPE_NETBSD_LFS; const struct uuid GET_nbsd_swap = GPT_ENT_TYPE_NETBSD_SWAP; #endif /* NO_GPT */ #ifdef _STANDALONE static struct btinfo_bootdisk bi_disk; static struct btinfo_bootwedge bi_wedge; #endif #define MBR_PARTS(buf) ((char *)(buf) + offsetof(struct mbr_sector, mbr_parts)) #define RF_PROTECTED_SECTORS 64 /* XXX refer to <.../rf_optnames.h> */ int biosdisk_strategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize) { struct biosdisk *d; int blks, frag; if (flag != F_READ) return EROFS; d = (struct biosdisk *) devdata; if (d->ll.type == BIOSDISK_TYPE_CD) dblk = dblk * DEV_BSIZE / ISO_DEFAULT_BLOCK_SIZE; dblk += d->boff; blks = size / d->ll.secsize; if (blks && readsects(&d->ll, dblk, blks, buf, 0)) { if (rsize) *rsize = 0; return EIO; } /* needed for CD */ frag = size % d->ll.secsize; if (frag) { if (readsects(&d->ll, dblk + blks, 1, d->buf, 0)) { if (rsize) *rsize = blks * d->ll.secsize; return EIO; } memcpy(buf + blks * d->ll.secsize, d->buf, frag); } if (rsize) *rsize = size; return 0; } static struct biosdisk * alloc_biosdisk(int biosdev) { struct biosdisk *d; d = alloc(sizeof(*d)); if (d == NULL) return NULL; memset(d, 0, sizeof(*d)); d->ll.dev = biosdev; if (set_geometry(&d->ll, NULL)) { #ifdef DISK_DEBUG printf("no geometry information\n"); #endif dealloc(d, sizeof(*d)); return NULL; } return d; } #if !defined(NO_DISKLABEL) || !defined(NO_GPT) static void md5(void *hash, const void *data, size_t len) { MD5_CTX ctx; MD5Init(&ctx); MD5Update(&ctx, data, len); MD5Final(hash, &ctx); return; } #endif #ifndef NO_GPT static bool guid_is_nil(const struct uuid *u) { static const struct uuid nil = { .time_low = 0 }; return (memcmp(u, &nil, sizeof(*u)) == 0 ? true : false); } static bool guid_is_equal(const struct uuid *a, const struct uuid *b) { return (memcmp(a, b, sizeof(*a)) == 0 ? true : false); } static int check_gpt(struct biosdisk *d, daddr_t sector) { struct gpt_hdr gpth; const struct gpt_ent *ep; const struct uuid *u; daddr_t entblk; size_t size; uint32_t crc; int sectors; int entries; int entry; int i, j; /* read in gpt_hdr sector */ if (readsects(&d->ll, sector, 1, d->buf, 1)) { #ifdef DISK_DEBUG printf("Error reading GPT header at %"PRId64"\n", sector); #endif return EIO; } memcpy(&gpth, d->buf, sizeof(gpth)); if (memcmp(GPT_HDR_SIG, gpth.hdr_sig, sizeof(gpth.hdr_sig))) return -1; crc = gpth.hdr_crc_self; gpth.hdr_crc_self = 0; gpth.hdr_crc_self = crc32(0, (const void *)&gpth, GPT_HDR_SIZE); if (gpth.hdr_crc_self != crc) { return -1; } if (gpth.hdr_lba_self != sector) return -1; #ifdef _STANDALONE bi_wedge.matchblk = sector; bi_wedge.matchnblks = 1; md5(bi_wedge.matchhash, d->buf, d->ll.secsize); #endif sectors = sizeof(d->buf)/d->ll.secsize; /* sectors per buffer */ entries = sizeof(d->buf)/gpth.hdr_entsz; /* entries per buffer */ entblk = gpth.hdr_lba_table; crc = crc32(0, NULL, 0); j = 0; ep = (const struct gpt_ent *)d->buf; for (entry = 0; entry < gpth.hdr_entries; entry += entries) { size = MIN(sizeof(d->buf), (gpth.hdr_entries - entry) * gpth.hdr_entsz); entries = size / gpth.hdr_entsz; sectors = roundup(size, d->ll.secsize) / d->ll.secsize; if (readsects(&d->ll, entblk, sectors, d->buf, 1)) return -1; entblk += sectors; crc = crc32(crc, (const void *)d->buf, size); for (i = 0; j < BIOSDISKNPART && i < entries; i++, j++) { u = (const struct uuid *)ep[i].ent_type; if (!guid_is_nil(u)) { d->part[j].offset = ep[i].ent_lba_start; d->part[j].size = ep[i].ent_lba_end - ep[i].ent_lba_start + 1; if (guid_is_equal(u, &GET_nbsd_ffs)) d->part[j].fstype = FS_BSDFFS; else if (guid_is_equal(u, &GET_nbsd_lfs)) d->part[j].fstype = FS_BSDLFS; else if (guid_is_equal(u, &GET_nbsd_raid)) d->part[j].fstype = FS_RAID; else if (guid_is_equal(u, &GET_nbsd_swap)) d->part[j].fstype = FS_SWAP; else d->part[j].fstype = FS_OTHER; } } } if (crc != gpth.hdr_crc_table) { #ifdef DISK_DEBUG printf("GPT table CRC invalid\n"); #endif return -1; } return 0; } static int read_gpt(struct biosdisk *d) { struct biosdisk_extinfo ed; daddr_t gptsector[2]; int i, error; if (d->ll.type != BIOSDISK_TYPE_HD) /* No GPT on floppy and CD */ return -1; gptsector[0] = GPT_HDR_BLKNO; if (set_geometry(&d->ll, &ed) == 0 && d->ll.flags & BIOSDISK_INT13EXT) { gptsector[1] = ed.totsec - 1; /* Sanity check values returned from BIOS */ if (ed.sbytes >= 512 && (ed.sbytes & (ed.sbytes - 1)) == 0) d->ll.secsize = ed.sbytes; } else { #ifdef DISK_DEBUG printf("Unable to determine extended disk geometry - " "using CHS\n"); #endif /* at least try some other reasonable values then */ gptsector[1] = d->ll.chs_sectors - 1; } for (i = 0; i < __arraycount(gptsector); i++) { error = check_gpt(d, gptsector[i]); if (error == 0) break; } if (i >= __arraycount(gptsector)) { memset(d->part, 0, sizeof(d->part)); return -1; } #ifndef USE_SECONDARY_GPT if (i > 0) { #ifdef DISK_DEBUG printf("ignoring valid secondary GPT\n"); #endif return -1; } #endif #ifdef DISK_DEBUG printf("using %s GPT\n", (i == 0) ? "primary" : "secondary"); #endif return 0; } #endif /* !NO_GPT */ #ifndef NO_DISKLABEL static void ingest_label(struct biosdisk *d, struct disklabel *lp) { int part; memset(d->part, 0, sizeof(d->part)); for (part = 0; part < lp->d_npartitions; part++) { if (lp->d_partitions[part].p_size == 0) continue; if (lp->d_partitions[part].p_fstype == FS_UNUSED) continue; d->part[part].fstype = lp->d_partitions[part].p_fstype; d->part[part].offset = lp->d_partitions[part].p_offset; d->part[part].size = lp->d_partitions[part].p_size; } } static int check_label(struct biosdisk *d, daddr_t sector) { struct disklabel *lp; /* find partition in NetBSD disklabel */ if (readsects(&d->ll, sector + LABELSECTOR, 1, d->buf, 0)) { #ifdef DISK_DEBUG printf("Error reading disklabel\n"); #endif return EIO; } lp = (struct disklabel *) (d->buf + LABELOFFSET); if (lp->d_magic != DISKMAGIC || dkcksum(lp)) { #ifdef DISK_DEBUG printf("warning: no disklabel in sector %"PRId64"\n", sector); #endif return -1; } ingest_label(d, lp); #ifdef _STANDALONE bi_disk.labelsector = sector + LABELSECTOR; bi_disk.label.type = lp->d_type; memcpy(bi_disk.label.packname, lp->d_packname, 16); bi_disk.label.checksum = lp->d_checksum; bi_wedge.matchblk = sector + LABELSECTOR; bi_wedge.matchnblks = 1; md5(bi_wedge.matchhash, d->buf, d->ll.secsize); #endif return 0; } static int read_minix_subp(struct biosdisk *d, struct disklabel* dflt_lbl, int this_ext, daddr_t sector) { struct mbr_partition mbr[MBR_PART_COUNT]; int i; int typ; struct partition *p; if (readsects(&d->ll, sector, 1, d->buf, 0)) { #ifdef DISK_DEBUG printf("Error reading MFS sector %"PRId64"\n", sector); #endif return EIO; } if ((uint8_t)d->buf[510] != 0x55 || (uint8_t)d->buf[511] != 0xAA) { return -1; } memcpy(&mbr, MBR_PARTS(d->buf), sizeof(mbr)); for (i = 0; i < MBR_PART_COUNT; i++) { typ = mbr[i].mbrp_type; if (typ == 0) continue; sector = this_ext + mbr[i].mbrp_start; if (dflt_lbl->d_npartitions >= MAXPARTITIONS) continue; p = &dflt_lbl->d_partitions[dflt_lbl->d_npartitions++]; p->p_offset = sector; p->p_size = mbr[i].mbrp_size; p->p_fstype = xlat_mbr_fstype(typ); } return 0; } static int read_label(struct biosdisk *d) { struct disklabel dflt_lbl; struct mbr_partition mbr[MBR_PART_COUNT]; struct partition *p; uint32_t sector; int i; int error; int typ; uint32_t ext_base, this_ext, next_ext; #ifdef COMPAT_386BSD_MBRPART int sector_386bsd = -1; #endif memset(&dflt_lbl, 0, sizeof(dflt_lbl)); dflt_lbl.d_npartitions = 8; d->boff = 0; if (d->ll.type != BIOSDISK_TYPE_HD) /* No label on floppy and CD */ return -1; /* * find NetBSD Partition in DOS partition table * XXX check magic??? */ ext_base = 0; next_ext = 0; for (;;) { this_ext = ext_base + next_ext; next_ext = 0; if (readsects(&d->ll, this_ext, 1, d->buf, 0)) { #ifdef DISK_DEBUG printf("error reading MBR sector %u\n", this_ext); #endif return EIO; } memcpy(&mbr, MBR_PARTS(d->buf), sizeof(mbr)); /* Look for NetBSD partition ID */ for (i = 0; i < MBR_PART_COUNT; i++) { typ = mbr[i].mbrp_type; if (typ == 0) continue; sector = this_ext + mbr[i].mbrp_start; #ifdef DISK_DEBUG printf("ptn type %d in sector %u\n", typ, sector); #endif if (typ == MBR_PTYPE_MINIX_14B) { if (!read_minix_subp(d, &dflt_lbl, this_ext, sector)) { /* Don't add "container" partition */ continue; } } if (typ == MBR_PTYPE_NETBSD) { error = check_label(d, sector); if (error >= 0) return error; } if (MBR_IS_EXTENDED(typ)) { next_ext = mbr[i].mbrp_start; continue; } #ifdef COMPAT_386BSD_MBRPART if (this_ext == 0 && typ == MBR_PTYPE_386BSD) sector_386bsd = sector; #endif if (this_ext != 0) { if (dflt_lbl.d_npartitions >= MAXPARTITIONS) continue; p = &dflt_lbl.d_partitions[dflt_lbl.d_npartitions++]; } else p = &dflt_lbl.d_partitions[i]; p->p_offset = sector; p->p_size = mbr[i].mbrp_size; p->p_fstype = xlat_mbr_fstype(typ); } if (next_ext == 0) break; if (ext_base == 0) { ext_base = next_ext; next_ext = 0; } } sector = 0; #ifdef COMPAT_386BSD_MBRPART if (sector_386bsd != -1) { printf("old BSD partition ID!\n"); sector = sector_386bsd; } #endif /* * One of two things: * 1. no MBR * 2. no NetBSD partition in MBR * * We simply default to "start of disk" in this case and * press on. */ error = check_label(d, sector); if (error >= 0) return error; /* * Nothing at start of disk, return info from mbr partitions. */ /* XXX fill it to make checksum match kernel one */ dflt_lbl.d_checksum = dkcksum(&dflt_lbl); ingest_label(d, &dflt_lbl); return 0; } #endif /* NO_DISKLABEL */ #if !defined(NO_DISKLABEL) || !defined(NO_GPT) static int read_partitions(struct biosdisk *d) { int error; error = -1; #ifndef NO_GPT error = read_gpt(d); if (error == 0) return 0; #endif #ifndef NO_DISKLABEL error = read_label(d); #endif return error; } #endif void biosdisk_probe(void) { struct biosdisk d; struct biosdisk_extinfo ed; uint64_t size; int first; int i; #if !defined(NO_DISKLABEL) || !defined(NO_GPT) int part; #endif for (i = 0; i < MAX_BIOSDISKS + 2; i++) { first = 1; memset(&d, 0, sizeof(d)); memset(&ed, 0, sizeof(ed)); if (i >= MAX_BIOSDISKS) d.ll.dev = 0x00 + i - MAX_BIOSDISKS; /* fd */ else d.ll.dev = 0x80 + i; /* hd/cd */ if (set_geometry(&d.ll, &ed)) continue; printf("disk "); switch (d.ll.type) { case BIOSDISK_TYPE_CD: printf("cd0\n cd0a\n"); break; case BIOSDISK_TYPE_FD: printf("fd%d\n", d.ll.dev & 0x7f); printf(" fd%da\n", d.ll.dev & 0x7f); break; case BIOSDISK_TYPE_HD: printf("hd%d", d.ll.dev & 0x7f); if (d.ll.flags & BIOSDISK_INT13EXT) { printf(" size "); size = ed.totsec * ed.sbytes; if (size >= (10ULL * 1024 * 1024 * 1024)) printf("%"PRIu64" GB", size / (1024 * 1024 * 1024)); else printf("%"PRIu64" MB", size / (1024 * 1024)); } printf("\n"); break; } #if !defined(NO_DISKLABEL) || !defined(NO_GPT) if (d.ll.type != BIOSDISK_TYPE_HD) continue; if (read_partitions(&d) != 0) continue; for (part = 0; part < BIOSDISKNPART; part++) { if (d.part[part].size == 0) continue; if (d.part[part].fstype == FS_UNUSED) continue; if (first) { printf(" "); first = 0; } printf(" hd%d%c(", d.ll.dev & 0x7f, part + 'a'); if (d.part[part].fstype < FSMAXTYPES) printf("%s", fstypenames[d.part[part].fstype]); else printf("%d", d.part[part].fstype); printf(")"); } #endif if (first == 0) printf("\n"); } } /* Determine likely partition for possible sector number of dos * partition. */ int biosdisk_findpartition(int biosdev, daddr_t sector) { #if defined(NO_DISKLABEL) && defined(NO_GPT) return 0; #else struct biosdisk *d; int partition = 0; #ifdef DISK_DEBUG printf("looking for partition device %x, sector %"PRId64"\n", biosdev, sector); #endif /* Look for netbsd partition that is the dos boot one */ d = alloc_biosdisk(biosdev); if (d == NULL) return 0; if (read_partitions(d) == 0) { for (partition = (BIOSDISKNPART-1); --partition;) { if (d->part[partition].fstype == FS_UNUSED) continue; if (d->part[partition].offset == sector) break; } } dealloc(d, sizeof(*d)); return partition; #endif /* NO_DISKLABEL && NO_GPT */ } #ifdef _STANDALONE static void add_biosdisk_bootinfo(void) { static bool done; if (bootinfo == NULL) { done = false; return; } if (done) return; BI_ADD(&bi_disk, BTINFO_BOOTDISK, sizeof(bi_disk)); BI_ADD(&bi_wedge, BTINFO_BOOTWEDGE, sizeof(bi_wedge)); done = true; return; } #endif int biosdisk_open(struct open_file *f, ...) /* struct open_file *f, int biosdev, int partition */ { va_list ap; struct biosdisk *d; int biosdev; int partition; int error = 0; va_start(ap, f); biosdev = va_arg(ap, int); d = alloc_biosdisk(biosdev); if (d == NULL) { error = ENXIO; goto out; } partition = va_arg(ap, int); #ifdef _STANDALONE bi_disk.biosdev = d->ll.dev; bi_disk.partition = partition; bi_disk.labelsector = -1; bi_wedge.biosdev = d->ll.dev; bi_wedge.matchblk = -1; #endif #if !defined(NO_DISKLABEL) || !defined(NO_GPT) error = read_partitions(d); if (error == -1) { error = 0; goto nolabel; } if (error) goto out; if (partition >= BIOSDISKNPART || d->part[partition].fstype == FS_UNUSED) { #ifdef DISK_DEBUG printf("illegal partition\n"); #endif error = EPART; goto out; } d->boff = d->part[partition].offset; if (d->part[partition].fstype == FS_RAID) d->boff += RF_PROTECTED_SECTORS; #ifdef _STANDALONE bi_wedge.startblk = d->part[partition].offset; bi_wedge.nblks = d->part[partition].size; #endif nolabel: #endif #ifdef DISK_DEBUG printf("partition @%"PRId64"\n", d->boff); #endif #ifdef _STANDALONE add_biosdisk_bootinfo(); #endif f->f_devdata = d; out: va_end(ap); if (error) dealloc(d, sizeof(*d)); return error; } #ifndef LIBSA_NO_FS_CLOSE int biosdisk_close(struct open_file *f) { struct biosdisk *d = f->f_devdata; /* let the floppy drive go off */ if (d->ll.type == BIOSDISK_TYPE_FD) wait_sec(3); /* 2s is enough on all PCs I found */ dealloc(d, sizeof(*d)); f->f_devdata = NULL; return 0; } #endif int biosdisk_ioctl(struct open_file *f, u_long cmd, void *arg) { return EIO; }