/* $NetBSD: boot1.c,v 1.20.64.1 2023/06/30 17:22:17 martin Exp $ */ /*- * Copyright (c) 2003 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by David Laight. * * 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. */ #include __RCSID("$NetBSD: boot1.c,v 1.20.64.1 2023/06/30 17:22:17 martin Exp $"); #include #include #include #include #include #include #include #include #include /* For RF_PROTECTED_SECTORS */ #define XSTR(x) #x #define STR(x) XSTR(x) static daddr_t bios_sector; static struct biosdisk_ll d; const char *boot1(uint32_t, uint64_t *); #ifndef NO_GPT static daddr_t gpt_lookup(daddr_t); #endif extern void putstr(const char *); extern struct disklabel ptn_disklabel; static int ob(void) { return open("boot", 0); } const char * boot1(uint32_t biosdev, uint64_t *sector) { struct stat sb; int fd; bios_sector = *sector; d.dev = biosdev; putstr("\r\nNetBSD/x86 " STR(FS) " Primary Bootstrap\r\n"); if (set_geometry(&d, NULL)) return "set_geometry\r\n"; /* * We default to the filesystem at the start of the * MBR partition */ fd = ob(); if (fd != -1) goto done; /* * Maybe the filesystem is enclosed in a raid set. * add in size of raidframe header and try again. * (Maybe this should only be done if the filesystem * magic number is absent.) */ bios_sector += RF_PROTECTED_SECTORS; fd = ob(); if (fd != -1) goto done; #ifndef NO_GPT /* * Test for a GPT inside the RAID */ bios_sector += gpt_lookup(bios_sector); fd = ob(); if (fd != -1) goto done; #endif /* * Nothing at the start of the MBR partition, fallback on * partition 'a' from the disklabel in this MBR partition. */ if (ptn_disklabel.d_magic != DISKMAGIC || ptn_disklabel.d_magic2 != DISKMAGIC || ptn_disklabel.d_partitions[0].p_fstype == FS_UNUSED) goto done; bios_sector = ptn_disklabel.d_partitions[0].p_offset; *sector = bios_sector; if (ptn_disklabel.d_partitions[0].p_fstype == FS_RAID) bios_sector += RF_PROTECTED_SECTORS; fd = ob(); done: /* if we fail here, so will fstat, so keep going */ if (fd == -1 || fstat(fd, &sb) == -1) return "Can't open /boot\r\n"; biosdev = (uint32_t)sb.st_size; #if 0 if (biosdev > SECONDARY_MAX_LOAD) return "/boot too large\r\n"; #endif if (read(fd, (void *)SECONDARY_LOAD_ADDRESS, biosdev) != biosdev) return "/boot load failed\r\n"; if (*(uint32_t *)(SECONDARY_LOAD_ADDRESS + 4) != X86_BOOT_MAGIC_2) return "Invalid /boot file format\r\n"; /* We need to jump to the secondary bootstrap in realmode */ return 0; } int blkdevstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize) { if (flag != F_READ) return EROFS; if (size & (BIOSDISK_DEFAULT_SECSIZE - 1)) return EINVAL; if (rsize) *rsize = size; if (size != 0 && readsects(&d, bios_sector + dblk, size / BIOSDISK_DEFAULT_SECSIZE, buf, 1) != 0) return EIO; return 0; } #ifndef NO_GPT static int is_unused(struct gpt_ent *ent) { const struct uuid unused = GPT_ENT_TYPE_UNUSED; return (memcmp(ent->ent_type, &unused, sizeof(unused)) == 0); } static int is_bootable(struct gpt_ent *ent) { /* GPT_ENT_TYPE_NETBSD_RAID omitted as we are already in a RAID */ const struct uuid bootable[] = { GPT_ENT_TYPE_NETBSD_FFS, GPT_ENT_TYPE_NETBSD_LFS, GPT_ENT_TYPE_NETBSD_CCD, GPT_ENT_TYPE_NETBSD_CGD, }; int i; for (i = 0; i < sizeof(bootable) / sizeof(*bootable); i++) { if (memcmp(ent->ent_type, &bootable[i], sizeof(struct uuid)) == 0) return 1; } return 0; } static daddr_t gpt_lookup(daddr_t sector) { char buf[BIOSDISK_DEFAULT_SECSIZE]; struct mbr_sector *pmbr; const char gpt_hdr_sig[] = GPT_HDR_SIG; struct gpt_hdr *hdr; struct gpt_ent *ent; uint32_t nents; uint32_t entsz; uint32_t entries_per_sector; uint32_t sectors_per_entry; uint64_t firstpart_lba = 0; uint64_t bootable_lba = 0; uint64_t bootme_lba = 0; int i, j; /* * Look for a PMBR */ if (readsects(&d, sector, 1, buf, 1) != 0) return 0; pmbr = (struct mbr_sector *)buf; if (pmbr->mbr_magic != htole16(MBR_MAGIC)) return 0; if (pmbr->mbr_parts[0].mbrp_type != MBR_PTYPE_PMBR) return 0; sector++; /* skip PMBR */ /* * Look for a GPT header * Space is scarce, we do not check CRC. */ if (readsects(&d, sector, 1, buf, 1) != 0) return 0; hdr = (struct gpt_hdr *)buf; if (memcmp(gpt_hdr_sig, hdr->hdr_sig, sizeof(hdr->hdr_sig)) != 0) return 0; if (hdr->hdr_revision != htole32(GPT_HDR_REVISION)) return 0; if (le32toh(hdr->hdr_size) > BIOSDISK_DEFAULT_SECSIZE) return 0; nents = le32toh(hdr->hdr_entries); entsz = le32toh(hdr->hdr_entsz); sector++; /* skip GPT header */ /* * Read partition table * * According to UEFI specification section 5.3.2, entries * are 128 * (2^n) bytes long. The most common scenario is * 128 bytes (n = 0) where there are 4 entries per sector. * If n > 2, then entries spans multiple sectors, but they * remain sector-aligned. */ entries_per_sector = BIOSDISK_DEFAULT_SECSIZE / entsz; if (entries_per_sector == 0) entries_per_sector = 1; sectors_per_entry = entsz / BIOSDISK_DEFAULT_SECSIZE; if (sectors_per_entry == 0) sectors_per_entry = 1; for (i = 0; i < nents; i += entries_per_sector) { if (readsects(&d, sector, 1, buf, 1) != 0) return 0; sector += sectors_per_entry; for (j = 0; j < entries_per_sector; j++) { ent = (struct gpt_ent *)&buf[j * entsz]; if (is_unused(ent)) continue; /* First bootme wins, we can stop there */ if (ent->ent_attr & GPT_ENT_ATTR_BOOTME) { bootme_lba = le64toh(ent->ent_lba_start); goto out; } if (firstpart_lba == 0) firstpart_lba = le64toh(ent->ent_lba_start); if (is_bootable(ent) && bootable_lba == 0) bootable_lba = le64toh(ent->ent_lba_start); } } out: if (bootme_lba) return bootme_lba; if (bootable_lba) return bootable_lba; if (firstpart_lba) return firstpart_lba; return 0; } #endif /* ! NO_GPT */