384 lines
11 KiB
C
384 lines
11 KiB
C
/*-
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* Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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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 AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/gpt.h>
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#ifndef LITTLE_ENDIAN
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#error gpt.c works only for little endian architectures
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#endif
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#include "stand.h"
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#include "zlib.h"
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#include "drv.h"
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#include "gpt.h"
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static struct gpt_hdr hdr_primary, hdr_backup, *gpthdr;
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static uint64_t hdr_primary_lba, hdr_backup_lba;
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static struct gpt_ent table_primary[MAXTBLENTS], table_backup[MAXTBLENTS];
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static struct gpt_ent *gpttable;
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static int curent, bootonce;
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/*
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* Buffer below 64kB passed on gptread(), which can hold at least
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* one sector of data (512 bytes).
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*/
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static char *secbuf;
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static void
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gptupdate(const char *which, struct dsk *dskp, struct gpt_hdr *hdr,
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struct gpt_ent *table)
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{
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int entries_per_sec, firstent;
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daddr_t slba;
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/*
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* We need to update the following for both primary and backup GPT:
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* 1. Sector on disk that contains current partition.
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* 2. Partition table checksum.
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* 3. Header checksum.
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* 4. Header on disk.
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*/
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entries_per_sec = DEV_BSIZE / hdr->hdr_entsz;
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slba = curent / entries_per_sec;
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firstent = slba * entries_per_sec;
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bcopy(&table[firstent], secbuf, DEV_BSIZE);
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slba += hdr->hdr_lba_table;
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if (drvwrite(dskp, secbuf, slba, 1)) {
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printf("%s: unable to update %s GPT partition table\n",
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BOOTPROG, which);
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return;
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}
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hdr->hdr_crc_table = crc32(0, Z_NULL, 0);
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hdr->hdr_crc_table = crc32(hdr->hdr_crc_table, (const Bytef *)table,
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hdr->hdr_entries * hdr->hdr_entsz);
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hdr->hdr_crc_self = crc32(0, Z_NULL, 0);
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hdr->hdr_crc_self = crc32(hdr->hdr_crc_self, (const Bytef *)hdr,
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hdr->hdr_size);
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bzero(secbuf, DEV_BSIZE);
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bcopy(hdr, secbuf, hdr->hdr_size);
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if (drvwrite(dskp, secbuf, hdr->hdr_lba_self, 1)) {
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printf("%s: unable to update %s GPT header\n", BOOTPROG, which);
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return;
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}
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}
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int
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gptfind(const uuid_t *uuid, struct dsk *dskp, int part)
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{
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struct gpt_ent *ent;
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int firsttry;
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if (part >= 0) {
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if (part == 0 || part > gpthdr->hdr_entries) {
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printf("%s: invalid partition index\n", BOOTPROG);
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return (-1);
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}
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ent = &gpttable[part - 1];
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if (bcmp(&ent->ent_type, uuid, sizeof(uuid_t)) != 0) {
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printf("%s: specified partition is not UFS\n",
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BOOTPROG);
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return (-1);
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}
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curent = part - 1;
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goto found;
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}
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firsttry = (curent == -1);
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curent++;
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if (curent >= gpthdr->hdr_entries) {
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curent = gpthdr->hdr_entries;
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return (-1);
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}
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if (bootonce) {
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/*
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* First look for partition with both GPT_ENT_ATTR_BOOTME and
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* GPT_ENT_ATTR_BOOTONCE flags.
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*/
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for (; curent < gpthdr->hdr_entries; curent++) {
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ent = &gpttable[curent];
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if (bcmp(&ent->ent_type, uuid, sizeof(uuid_t)) != 0)
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continue;
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if (!(ent->ent_attr & GPT_ENT_ATTR_BOOTME))
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continue;
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if (!(ent->ent_attr & GPT_ENT_ATTR_BOOTONCE))
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continue;
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/* Ok, found one. */
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goto found;
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}
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bootonce = 0;
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curent = 0;
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}
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for (; curent < gpthdr->hdr_entries; curent++) {
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ent = &gpttable[curent];
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if (bcmp(&ent->ent_type, uuid, sizeof(uuid_t)) != 0)
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continue;
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if (!(ent->ent_attr & GPT_ENT_ATTR_BOOTME))
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continue;
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if (ent->ent_attr & GPT_ENT_ATTR_BOOTONCE)
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continue;
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/* Ok, found one. */
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goto found;
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}
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if (firsttry) {
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/*
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* No partition with BOOTME flag was found, try to boot from
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* first UFS partition.
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*/
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for (curent = 0; curent < gpthdr->hdr_entries; curent++) {
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ent = &gpttable[curent];
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if (bcmp(&ent->ent_type, uuid, sizeof(uuid_t)) != 0)
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continue;
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/* Ok, found one. */
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goto found;
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}
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}
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return (-1);
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found:
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dskp->part = curent + 1;
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ent = &gpttable[curent];
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dskp->start = ent->ent_lba_start;
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if (ent->ent_attr & GPT_ENT_ATTR_BOOTONCE) {
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/*
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* Clear BOOTME, but leave BOOTONCE set before trying to
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* boot from this partition.
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*/
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if (hdr_primary_lba > 0) {
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table_primary[curent].ent_attr &= ~GPT_ENT_ATTR_BOOTME;
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gptupdate("primary", dskp, &hdr_primary, table_primary);
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}
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if (hdr_backup_lba > 0) {
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table_backup[curent].ent_attr &= ~GPT_ENT_ATTR_BOOTME;
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gptupdate("backup", dskp, &hdr_backup, table_backup);
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}
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}
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return (0);
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}
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static int
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gptread_hdr(const char *which, struct dsk *dskp, struct gpt_hdr *hdr,
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uint64_t hdrlba)
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{
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uint32_t crc;
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if (drvread(dskp, secbuf, hdrlba, 1)) {
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printf("%s: unable to read %s GPT header\n", BOOTPROG, which);
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return (-1);
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}
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bcopy(secbuf, hdr, sizeof(*hdr));
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if (bcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0 ||
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hdr->hdr_lba_self != hdrlba || hdr->hdr_revision < 0x00010000 ||
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hdr->hdr_entsz < sizeof(struct gpt_ent) ||
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hdr->hdr_entries > MAXTBLENTS || DEV_BSIZE % hdr->hdr_entsz != 0) {
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printf("%s: invalid %s GPT header\n", BOOTPROG, which);
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return (-1);
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}
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crc = hdr->hdr_crc_self;
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hdr->hdr_crc_self = crc32(0, Z_NULL, 0);
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if (crc32(hdr->hdr_crc_self, (const Bytef *)hdr, hdr->hdr_size) !=
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crc) {
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printf("%s: %s GPT header checksum mismatch\n", BOOTPROG,
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which);
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return (-1);
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}
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hdr->hdr_crc_self = crc;
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return (0);
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}
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void
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gptbootfailed(struct dsk *dskp)
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{
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if (!(gpttable[curent].ent_attr & GPT_ENT_ATTR_BOOTONCE))
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return;
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if (hdr_primary_lba > 0) {
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table_primary[curent].ent_attr &= ~GPT_ENT_ATTR_BOOTONCE;
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table_primary[curent].ent_attr |= GPT_ENT_ATTR_BOOTFAILED;
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gptupdate("primary", dskp, &hdr_primary, table_primary);
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}
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if (hdr_backup_lba > 0) {
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table_backup[curent].ent_attr &= ~GPT_ENT_ATTR_BOOTONCE;
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table_backup[curent].ent_attr |= GPT_ENT_ATTR_BOOTFAILED;
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gptupdate("backup", dskp, &hdr_backup, table_backup);
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}
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}
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static void
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gptbootconv(const char *which, struct dsk *dskp, struct gpt_hdr *hdr,
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struct gpt_ent *table)
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{
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struct gpt_ent *ent;
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daddr_t slba;
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int table_updated, sector_updated;
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int entries_per_sec, nent, part;
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table_updated = 0;
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entries_per_sec = DEV_BSIZE / hdr->hdr_entsz;
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for (nent = 0, slba = hdr->hdr_lba_table;
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slba < hdr->hdr_lba_table + hdr->hdr_entries / entries_per_sec;
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slba++, nent += entries_per_sec) {
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sector_updated = 0;
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for (part = 0; part < entries_per_sec; part++) {
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ent = &table[nent + part];
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if ((ent->ent_attr & (GPT_ENT_ATTR_BOOTME |
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GPT_ENT_ATTR_BOOTONCE |
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GPT_ENT_ATTR_BOOTFAILED)) !=
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GPT_ENT_ATTR_BOOTONCE) {
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continue;
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}
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ent->ent_attr &= ~GPT_ENT_ATTR_BOOTONCE;
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ent->ent_attr |= GPT_ENT_ATTR_BOOTFAILED;
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table_updated = 1;
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sector_updated = 1;
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}
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if (!sector_updated)
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continue;
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bcopy(&table[nent], secbuf, DEV_BSIZE);
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if (drvwrite(dskp, secbuf, slba, 1)) {
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printf("%s: unable to update %s GPT partition table\n",
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BOOTPROG, which);
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}
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}
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if (!table_updated)
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return;
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hdr->hdr_crc_table = crc32(0, Z_NULL, 0);
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hdr->hdr_crc_table = crc32(hdr->hdr_crc_table, (const Bytef *)table,
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hdr->hdr_entries * hdr->hdr_entsz);
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hdr->hdr_crc_self = crc32(0, Z_NULL, 0);
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hdr->hdr_crc_self = crc32(hdr->hdr_crc_self, (const Bytef *)hdr,
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hdr->hdr_size);
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bzero(secbuf, DEV_BSIZE);
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bcopy(hdr, secbuf, hdr->hdr_size);
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if (drvwrite(dskp, secbuf, hdr->hdr_lba_self, 1))
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printf("%s: unable to update %s GPT header\n", BOOTPROG, which);
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}
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static int
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gptread_table(const char *which, struct dsk *dskp, struct gpt_hdr *hdr,
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struct gpt_ent *table)
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{
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struct gpt_ent *ent;
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int entries_per_sec;
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int part, nent;
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daddr_t slba;
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if (hdr->hdr_entries == 0)
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return (0);
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entries_per_sec = DEV_BSIZE / hdr->hdr_entsz;
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slba = hdr->hdr_lba_table;
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nent = 0;
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for (;;) {
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if (drvread(dskp, secbuf, slba, 1)) {
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printf("%s: unable to read %s GPT partition table\n",
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BOOTPROG, which);
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return (-1);
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}
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ent = (struct gpt_ent *)secbuf;
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for (part = 0; part < entries_per_sec; part++, ent++) {
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bcopy(ent, &table[nent], sizeof(table[nent]));
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if (++nent >= hdr->hdr_entries)
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break;
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}
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if (nent >= hdr->hdr_entries)
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break;
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slba++;
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}
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if (crc32(0, (const Bytef *)table, nent * hdr->hdr_entsz) !=
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hdr->hdr_crc_table) {
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printf("%s: %s GPT table checksum mismatch\n", BOOTPROG, which);
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return (-1);
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}
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return (0);
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}
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int
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gptread(struct dsk *dskp, char *buf)
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{
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uint64_t altlba;
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/*
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* Read and verify both GPT headers: primary and backup.
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*/
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secbuf = buf;
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hdr_primary_lba = hdr_backup_lba = 0;
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curent = -1;
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bootonce = 1;
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dskp->start = 0;
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if (gptread_hdr("primary", dskp, &hdr_primary, 1) == 0 &&
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gptread_table("primary", dskp, &hdr_primary, table_primary) == 0) {
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hdr_primary_lba = hdr_primary.hdr_lba_self;
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gpthdr = &hdr_primary;
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gpttable = table_primary;
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}
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if (hdr_primary_lba > 0) {
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/*
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* If primary header is valid, we can get backup
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* header location from there.
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*/
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altlba = hdr_primary.hdr_lba_alt;
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} else {
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altlba = drvsize(dskp);
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if (altlba > 0)
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altlba--;
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}
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if (altlba == 0)
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printf("%s: unable to locate backup GPT header\n", BOOTPROG);
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else if (gptread_hdr("backup", dskp, &hdr_backup, altlba) == 0 &&
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gptread_table("backup", dskp, &hdr_backup, table_backup) == 0) {
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hdr_backup_lba = hdr_backup.hdr_lba_self;
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if (hdr_primary_lba == 0) {
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gpthdr = &hdr_backup;
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gpttable = table_backup;
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printf("%s: using backup GPT\n", BOOTPROG);
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}
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}
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/*
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* Convert all BOOTONCE without BOOTME flags into BOOTFAILED.
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* BOOTONCE without BOOTME means that we tried to boot from it,
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* but failed after leaving gptboot and machine was rebooted.
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* We don't want to leave partitions marked as BOOTONCE only,
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* because when we boot successfully start-up scripts should
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* find at most one partition with only BOOTONCE flag and this
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* will mean that we booted from that partition.
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*/
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if (hdr_primary_lba != 0)
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gptbootconv("primary", dskp, &hdr_primary, table_primary);
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if (hdr_backup_lba != 0)
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gptbootconv("backup", dskp, &hdr_backup, table_backup);
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if (hdr_primary_lba == 0 && hdr_backup_lba == 0)
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return (-1);
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return (0);
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}
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