diff options
Diffstat (limited to 'stand/i386/zfsboot/zfsboot.c')
| -rw-r--r-- | stand/i386/zfsboot/zfsboot.c | 1151 |
1 files changed, 1151 insertions, 0 deletions
diff --git a/stand/i386/zfsboot/zfsboot.c b/stand/i386/zfsboot/zfsboot.c new file mode 100644 index 0000000..88b5231 --- /dev/null +++ b/stand/i386/zfsboot/zfsboot.c @@ -0,0 +1,1151 @@ +/*- + * Copyright (c) 1998 Robert Nordier + * All rights reserved. + * + * Redistribution and use in source and binary forms are freely + * permitted provided that the above copyright notice and this + * paragraph and the following disclaimer are duplicated in all + * such forms. + * + * This software is provided "AS IS" and without any express or + * implied warranties, including, without limitation, the implied + * warranties of merchantability and fitness for a particular + * purpose. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/errno.h> +#include <sys/diskmbr.h> +#ifdef GPT +#include <sys/gpt.h> +#endif +#include <sys/reboot.h> +#include <sys/queue.h> + +#include <machine/bootinfo.h> +#include <machine/elf.h> +#include <machine/pc/bios.h> + +#include <stdarg.h> +#include <stddef.h> + +#include <a.out.h> + +#include <btxv86.h> + +#include "lib.h" +#include "rbx.h" +#include "drv.h" +#include "edd.h" +#include "util.h" +#include "cons.h" +#include "bootargs.h" +#include "paths.h" + +#include "libzfs.h" + +#define ARGS 0x900 +#define NOPT 14 +#define NDEV 3 + +#define BIOS_NUMDRIVES 0x475 +#define DRV_HARD 0x80 +#define DRV_MASK 0x7f + +#define TYPE_AD 0 +#define TYPE_DA 1 +#define TYPE_MAXHARD TYPE_DA +#define TYPE_FD 2 + +#define DEV_GELIBOOT_BSIZE 4096 + +extern uint32_t _end; + +#ifdef GPT +static const uuid_t freebsd_zfs_uuid = GPT_ENT_TYPE_FREEBSD_ZFS; +#endif +static const char optstr[NOPT] = "DhaCcdgmnpqrsv"; /* Also 'P', 'S' */ +static const unsigned char flags[NOPT] = { + RBX_DUAL, + RBX_SERIAL, + RBX_ASKNAME, + RBX_CDROM, + RBX_CONFIG, + RBX_KDB, + RBX_GDB, + RBX_MUTE, + RBX_NOINTR, + RBX_PAUSE, + RBX_QUIET, + RBX_DFLTROOT, + RBX_SINGLE, + RBX_VERBOSE +}; +uint32_t opts; + +static const unsigned char dev_maj[NDEV] = {30, 4, 2}; + +static char cmd[512]; +static char cmddup[512]; +static char kname[1024]; +static char rootname[256]; +static int comspeed = SIOSPD; +static struct bootinfo bootinfo; +static uint32_t bootdev; +static struct zfs_boot_args zfsargs; +static struct zfsmount zfsmount; + +vm_offset_t high_heap_base; +uint32_t bios_basemem, bios_extmem, high_heap_size; + +static struct bios_smap smap; + +/* + * The minimum amount of memory to reserve in bios_extmem for the heap. + */ +#define HEAP_MIN (64 * 1024 * 1024) + +static char *heap_next; +static char *heap_end; + +/* Buffers that must not span a 64k boundary. */ +#define READ_BUF_SIZE 8192 +struct dmadat { + char rdbuf[READ_BUF_SIZE]; /* for reading large things */ + char secbuf[READ_BUF_SIZE]; /* for MBR/disklabel */ +}; +static struct dmadat *dmadat; + +void exit(int); +void reboot(void); +static void load(void); +static int parse_cmd(void); +static void bios_getmem(void); +void *malloc(size_t n); +void free(void *ptr); +int main(void); + +void * +malloc(size_t n) +{ + char *p = heap_next; + if (p + n > heap_end) { + printf("malloc failure\n"); + for (;;) + ; + /* NOTREACHED */ + return (0); + } + heap_next += n; + return (p); +} + +void +free(void *ptr) +{ + + return; +} + +static char * +strdup(const char *s) +{ + char *p = malloc(strlen(s) + 1); + strcpy(p, s); + return (p); +} + +#ifdef LOADER_GELI_SUPPORT +#include "geliboot.c" +static char gelipw[GELI_PW_MAXLEN]; +static struct keybuf *gelibuf; +#endif + +#include "zfsimpl.c" + +/* + * Read from a dnode (which must be from a ZPL filesystem). + */ +static int +zfs_read(spa_t *spa, const dnode_phys_t *dnode, off_t *offp, void *start, size_t size) +{ + const znode_phys_t *zp = (const znode_phys_t *) dnode->dn_bonus; + size_t n; + int rc; + + n = size; + if (*offp + n > zp->zp_size) + n = zp->zp_size - *offp; + + rc = dnode_read(spa, dnode, *offp, start, n); + if (rc) + return (-1); + *offp += n; + + return (n); +} + +/* + * Current ZFS pool + */ +static spa_t *spa; +static spa_t *primary_spa; +static vdev_t *primary_vdev; + +/* + * A wrapper for dskread that doesn't have to worry about whether the + * buffer pointer crosses a 64k boundary. + */ +static int +vdev_read(vdev_t *vdev, void *priv, off_t off, void *buf, size_t bytes) +{ + char *p; + daddr_t lba, alignlba; + off_t diff; + unsigned int nb, alignnb; + struct dsk *dsk = (struct dsk *) priv; + + if ((off & (DEV_BSIZE - 1)) || (bytes & (DEV_BSIZE - 1))) + return -1; + + p = buf; + lba = off / DEV_BSIZE; + lba += dsk->start; + /* + * Align reads to 4k else 4k sector GELIs will not decrypt. + * Round LBA down to nearest multiple of DEV_GELIBOOT_BSIZE bytes. + */ + alignlba = rounddown2(off, DEV_GELIBOOT_BSIZE) / DEV_BSIZE; + /* + * The read must be aligned to DEV_GELIBOOT_BSIZE bytes relative to the + * start of the GELI partition, not the start of the actual disk. + */ + alignlba += dsk->start; + diff = (lba - alignlba) * DEV_BSIZE; + + while (bytes > 0) { + nb = bytes / DEV_BSIZE; + /* + * Ensure that the read size plus the leading offset does not + * exceed the size of the read buffer. + */ + if (nb > (READ_BUF_SIZE - diff) / DEV_BSIZE) + nb = (READ_BUF_SIZE - diff) / DEV_BSIZE; + /* + * Round the number of blocks to read up to the nearest multiple + * of DEV_GELIBOOT_BSIZE. + */ + alignnb = roundup2(nb * DEV_BSIZE + diff, DEV_GELIBOOT_BSIZE) + / DEV_BSIZE; + + if (drvread(dsk, dmadat->rdbuf, alignlba, alignnb)) + return -1; +#ifdef LOADER_GELI_SUPPORT + /* decrypt */ + if (is_geli(dsk) == 0) { + if (geli_read(dsk, ((alignlba - dsk->start) * + DEV_BSIZE), dmadat->rdbuf, alignnb * DEV_BSIZE)) + return (-1); + } +#endif + memcpy(p, dmadat->rdbuf + diff, nb * DEV_BSIZE); + p += nb * DEV_BSIZE; + lba += nb; + alignlba += alignnb; + bytes -= nb * DEV_BSIZE; + /* Don't need the leading offset after the first block. */ + diff = 0; + } + + return 0; +} + +static int +vdev_write(vdev_t *vdev, void *priv, off_t off, void *buf, size_t bytes) +{ + char *p; + daddr_t lba; + unsigned int nb; + struct dsk *dsk = (struct dsk *) priv; + + if ((off & (DEV_BSIZE - 1)) || (bytes & (DEV_BSIZE - 1))) + return -1; + + p = buf; + lba = off / DEV_BSIZE; + lba += dsk->start; + while (bytes > 0) { + nb = bytes / DEV_BSIZE; + if (nb > READ_BUF_SIZE / DEV_BSIZE) + nb = READ_BUF_SIZE / DEV_BSIZE; + memcpy(dmadat->rdbuf, p, nb * DEV_BSIZE); + if (drvwrite(dsk, dmadat->rdbuf, lba, nb)) + return -1; + p += nb * DEV_BSIZE; + lba += nb; + bytes -= nb * DEV_BSIZE; + } + + return 0; +} + +static int +xfsread(const dnode_phys_t *dnode, off_t *offp, void *buf, size_t nbyte) +{ + if ((size_t)zfs_read(spa, dnode, offp, buf, nbyte) != nbyte) { + printf("Invalid format\n"); + return -1; + } + return 0; +} + +/* + * Read Pad2 (formerly "Boot Block Header") area of the first + * vdev label of the given vdev. + */ +static int +vdev_read_pad2(vdev_t *vdev, char *buf, size_t size) +{ + blkptr_t bp; + char *tmp = zap_scratch; + off_t off = offsetof(vdev_label_t, vl_pad2); + + if (size > VDEV_PAD_SIZE) + size = VDEV_PAD_SIZE; + + BP_ZERO(&bp); + BP_SET_LSIZE(&bp, VDEV_PAD_SIZE); + BP_SET_PSIZE(&bp, VDEV_PAD_SIZE); + BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); + BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF); + DVA_SET_OFFSET(BP_IDENTITY(&bp), off); + if (vdev_read_phys(vdev, &bp, tmp, off, 0)) + return (EIO); + memcpy(buf, tmp, size); + return (0); +} + +static int +vdev_clear_pad2(vdev_t *vdev) +{ + char *zeroes = zap_scratch; + uint64_t *end; + off_t off = offsetof(vdev_label_t, vl_pad2); + + memset(zeroes, 0, VDEV_PAD_SIZE); + end = (uint64_t *)(zeroes + VDEV_PAD_SIZE); + /* ZIO_CHECKSUM_LABEL magic and pre-calcualted checksum for all zeros */ + end[-5] = 0x0210da7ab10c7a11; + end[-4] = 0x97f48f807f6e2a3f; + end[-3] = 0xaf909f1658aacefc; + end[-2] = 0xcbd1ea57ff6db48b; + end[-1] = 0x6ec692db0d465fab; + if (vdev_write(vdev, vdev->v_read_priv, off, zeroes, VDEV_PAD_SIZE)) + return (EIO); + return (0); +} + +static void +bios_getmem(void) +{ + uint64_t size; + + /* Parse system memory map */ + v86.ebx = 0; + do { + v86.ctl = V86_FLAGS; + v86.addr = 0x15; /* int 0x15 function 0xe820*/ + v86.eax = 0xe820; + v86.ecx = sizeof(struct bios_smap); + v86.edx = SMAP_SIG; + v86.es = VTOPSEG(&smap); + v86.edi = VTOPOFF(&smap); + v86int(); + if (V86_CY(v86.efl) || (v86.eax != SMAP_SIG)) + break; + /* look for a low-memory segment that's large enough */ + if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0) && + (smap.length >= (512 * 1024))) + bios_basemem = smap.length; + /* look for the first segment in 'extended' memory */ + if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0x100000)) { + bios_extmem = smap.length; + } + + /* + * Look for the largest segment in 'extended' memory beyond + * 1MB but below 4GB. + */ + if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base > 0x100000) && + (smap.base < 0x100000000ull)) { + size = smap.length; + + /* + * If this segment crosses the 4GB boundary, truncate it. + */ + if (smap.base + size > 0x100000000ull) + size = 0x100000000ull - smap.base; + + if (size > high_heap_size) { + high_heap_size = size; + high_heap_base = smap.base; + } + } + } while (v86.ebx != 0); + + /* Fall back to the old compatibility function for base memory */ + if (bios_basemem == 0) { + v86.ctl = 0; + v86.addr = 0x12; /* int 0x12 */ + v86int(); + + bios_basemem = (v86.eax & 0xffff) * 1024; + } + + /* Fall back through several compatibility functions for extended memory */ + if (bios_extmem == 0) { + v86.ctl = V86_FLAGS; + v86.addr = 0x15; /* int 0x15 function 0xe801*/ + v86.eax = 0xe801; + v86int(); + if (!V86_CY(v86.efl)) { + bios_extmem = ((v86.ecx & 0xffff) + ((v86.edx & 0xffff) * 64)) * 1024; + } + } + if (bios_extmem == 0) { + v86.ctl = 0; + v86.addr = 0x15; /* int 0x15 function 0x88*/ + v86.eax = 0x8800; + v86int(); + bios_extmem = (v86.eax & 0xffff) * 1024; + } + + /* + * If we have extended memory and did not find a suitable heap + * region in the SMAP, use the last 3MB of 'extended' memory as a + * high heap candidate. + */ + if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) { + high_heap_size = HEAP_MIN; + high_heap_base = bios_extmem + 0x100000 - HEAP_MIN; + } +} + +/* + * Try to detect a device supported by the legacy int13 BIOS + */ +static int +int13probe(int drive) +{ + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + v86.eax = 0x800; + v86.edx = drive; + v86int(); + + if (!V86_CY(v86.efl) && /* carry clear */ + ((v86.edx & 0xff) != (drive & DRV_MASK))) { /* unit # OK */ + if ((v86.ecx & 0x3f) == 0) { /* absurd sector size */ + return(0); /* skip device */ + } + return (1); + } + return(0); +} + +/* + * We call this when we find a ZFS vdev - ZFS consumes the dsk + * structure so we must make a new one. + */ +static struct dsk * +copy_dsk(struct dsk *dsk) +{ + struct dsk *newdsk; + + newdsk = malloc(sizeof(struct dsk)); + *newdsk = *dsk; + return (newdsk); +} + +/* + * Get disk size from eax=0x800 and 0x4800. We need to probe both + * because 0x4800 may not be available and we would like to get more + * or less correct disk size - if it is possible at all. + * Note we do not really want to touch drv.c because that code is shared + * with boot2 and we can not afford to grow that code. + */ +static uint64_t +drvsize_ext(struct dsk *dskp) +{ + uint64_t size, tmp; + int cyl, hds, sec; + + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + v86.eax = 0x800; + v86.edx = dskp->drive; + v86int(); + + /* Don't error out if we get bad sector number, try EDD as well */ + if (V86_CY(v86.efl) || /* carry set */ + (v86.edx & 0xff) <= (unsigned)(dskp->drive & 0x7f)) /* unit # bad */ + return (0); + + cyl = ((v86.ecx & 0xc0) << 2) + ((v86.ecx & 0xff00) >> 8) + 1; + /* Convert max head # -> # of heads */ + hds = ((v86.edx & 0xff00) >> 8) + 1; + sec = v86.ecx & 0x3f; + + size = (uint64_t)cyl * hds * sec; + + /* Determine if we can use EDD with this device. */ + v86.ctl = V86_FLAGS; + v86.addr = 0x13; + v86.eax = 0x4100; + v86.edx = dskp->drive; + v86.ebx = 0x55aa; + v86int(); + if (V86_CY(v86.efl) || /* carry set */ + (v86.ebx & 0xffff) != 0xaa55 || /* signature */ + (v86.ecx & EDD_INTERFACE_FIXED_DISK) == 0) + return (size); + + tmp = drvsize(dskp); + if (tmp > size) + size = tmp; + + return (size); +} + +/* + * The "layered" ioctl to read disk/partition size. Unfortunately + * the zfsboot case is hardest, because we do not have full software + * stack available, so we need to do some manual work here. + */ +uint64_t +ldi_get_size(void *priv) +{ + struct dsk *dskp = priv; + uint64_t size = dskp->size; + + if (dskp->start == 0) + size = drvsize_ext(dskp); + + return (size * DEV_BSIZE); +} + +static void +probe_drive(struct dsk *dsk) +{ +#ifdef GPT + struct gpt_hdr hdr; + struct gpt_ent *ent; + unsigned part, entries_per_sec; + daddr_t slba; +#endif +#if defined(GPT) || defined(LOADER_GELI_SUPPORT) + daddr_t elba; +#endif + + struct dos_partition *dp; + char *sec; + unsigned i; + + /* + * If we find a vdev on the whole disk, stop here. + */ + if (vdev_probe(vdev_read, dsk, NULL) == 0) + return; + +#ifdef LOADER_GELI_SUPPORT + /* + * Taste the disk, if it is GELI encrypted, decrypt it and check to see if + * it is a usable vdev then. Otherwise dig + * out the partition table and probe each slice/partition + * in turn for a vdev or GELI encrypted vdev. + */ + elba = drvsize_ext(dsk); + if (elba > 0) { + elba--; + } + if (geli_taste(vdev_read, dsk, elba) == 0) { + if (geli_havekey(dsk) == 0 || geli_passphrase(&gelipw, dsk->unit, + ':', 0, dsk) == 0) { + if (vdev_probe(vdev_read, dsk, NULL) == 0) { + return; + } + } + } +#endif /* LOADER_GELI_SUPPORT */ + + sec = dmadat->secbuf; + dsk->start = 0; + +#ifdef GPT + /* + * First check for GPT. + */ + if (drvread(dsk, sec, 1, 1)) { + return; + } + memcpy(&hdr, sec, sizeof(hdr)); + if (memcmp(hdr.hdr_sig, GPT_HDR_SIG, sizeof(hdr.hdr_sig)) != 0 || + hdr.hdr_lba_self != 1 || hdr.hdr_revision < 0x00010000 || + hdr.hdr_entsz < sizeof(*ent) || DEV_BSIZE % hdr.hdr_entsz != 0) { + goto trymbr; + } + + /* + * Probe all GPT partitions for the presence of ZFS pools. We + * return the spa_t for the first we find (if requested). This + * will have the effect of booting from the first pool on the + * disk. + * + * If no vdev is found, GELI decrypting the device and try again + */ + entries_per_sec = DEV_BSIZE / hdr.hdr_entsz; + slba = hdr.hdr_lba_table; + elba = slba + hdr.hdr_entries / entries_per_sec; + while (slba < elba) { + dsk->start = 0; + if (drvread(dsk, sec, slba, 1)) + return; + for (part = 0; part < entries_per_sec; part++) { + ent = (struct gpt_ent *)(sec + part * hdr.hdr_entsz); + if (memcmp(&ent->ent_type, &freebsd_zfs_uuid, + sizeof(uuid_t)) == 0) { + dsk->start = ent->ent_lba_start; + dsk->size = ent->ent_lba_end - ent->ent_lba_start + 1; + dsk->slice = part + 1; + dsk->part = 255; + if (vdev_probe(vdev_read, dsk, NULL) == 0) { + /* + * This slice had a vdev. We need a new dsk + * structure now since the vdev now owns this one. + */ + dsk = copy_dsk(dsk); + } +#ifdef LOADER_GELI_SUPPORT + else if (geli_taste(vdev_read, dsk, ent->ent_lba_end - + ent->ent_lba_start) == 0) { + if (geli_havekey(dsk) == 0 || geli_passphrase(&gelipw, + dsk->unit, 'p', dsk->slice, dsk) == 0) { + /* + * This slice has GELI, check it for ZFS. + */ + if (vdev_probe(vdev_read, dsk, NULL) == 0) { + /* + * This slice had a vdev. We need a new dsk + * structure now since the vdev now owns this one. + */ + dsk = copy_dsk(dsk); + } + break; + } + } +#endif /* LOADER_GELI_SUPPORT */ + } + } + slba++; + } + return; +trymbr: +#endif /* GPT */ + + if (drvread(dsk, sec, DOSBBSECTOR, 1)) + return; + dp = (void *)(sec + DOSPARTOFF); + + for (i = 0; i < NDOSPART; i++) { + if (!dp[i].dp_typ) + continue; + dsk->start = dp[i].dp_start; + dsk->size = dp[i].dp_size; + dsk->slice = i + 1; + if (vdev_probe(vdev_read, dsk, NULL) == 0) { + dsk = copy_dsk(dsk); + } +#ifdef LOADER_GELI_SUPPORT + else if (geli_taste(vdev_read, dsk, dp[i].dp_size - + dp[i].dp_start) == 0) { + if (geli_havekey(dsk) == 0 || geli_passphrase(&gelipw, dsk->unit, + 's', i, dsk) == 0) { + /* + * This slice has GELI, check it for ZFS. + */ + if (vdev_probe(vdev_read, dsk, NULL) == 0) { + /* + * This slice had a vdev. We need a new dsk + * structure now since the vdev now owns this one. + */ + dsk = copy_dsk(dsk); + } + break; + } + } +#endif /* LOADER_GELI_SUPPORT */ + } +} + +int +main(void) +{ + dnode_phys_t dn; + off_t off; + struct dsk *dsk; + int autoboot, i; + int nextboot; + int rc; + + dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base); + + bios_getmem(); + + if (high_heap_size > 0) { + heap_end = PTOV(high_heap_base + high_heap_size); + heap_next = PTOV(high_heap_base); + } else { + heap_next = (char *)dmadat + sizeof(*dmadat); + heap_end = (char *)PTOV(bios_basemem); + } + + dsk = malloc(sizeof(struct dsk)); + dsk->drive = *(uint8_t *)PTOV(ARGS); + dsk->type = dsk->drive & DRV_HARD ? TYPE_AD : TYPE_FD; + dsk->unit = dsk->drive & DRV_MASK; + dsk->slice = *(uint8_t *)PTOV(ARGS + 1) + 1; + dsk->part = 0; + dsk->start = 0; + dsk->size = 0; + + bootinfo.bi_version = BOOTINFO_VERSION; + bootinfo.bi_size = sizeof(bootinfo); + bootinfo.bi_basemem = bios_basemem / 1024; + bootinfo.bi_extmem = bios_extmem / 1024; + bootinfo.bi_memsizes_valid++; + bootinfo.bi_bios_dev = dsk->drive; + + bootdev = MAKEBOOTDEV(dev_maj[dsk->type], + dsk->slice, dsk->unit, dsk->part); + + /* Process configuration file */ + + autoboot = 1; + +#ifdef LOADER_GELI_SUPPORT + geli_init(); +#endif + zfs_init(); + + /* + * Probe the boot drive first - we will try to boot from whatever + * pool we find on that drive. + */ + probe_drive(dsk); + + /* + * Probe the rest of the drives that the bios knows about. This + * will find any other available pools and it may fill in missing + * vdevs for the boot pool. + */ +#ifndef VIRTUALBOX + for (i = 0; i < *(unsigned char *)PTOV(BIOS_NUMDRIVES); i++) +#else + for (i = 0; i < MAXBDDEV; i++) +#endif + { + if ((i | DRV_HARD) == *(uint8_t *)PTOV(ARGS)) + continue; + + if (!int13probe(i | DRV_HARD)) + break; + + dsk = malloc(sizeof(struct dsk)); + dsk->drive = i | DRV_HARD; + dsk->type = dsk->drive & TYPE_AD; + dsk->unit = i; + dsk->slice = 0; + dsk->part = 0; + dsk->start = 0; + dsk->size = 0; + probe_drive(dsk); + } + + /* + * The first discovered pool, if any, is the pool. + */ + spa = spa_get_primary(); + if (!spa) { + printf("%s: No ZFS pools located, can't boot\n", BOOTPROG); + for (;;) + ; + } + + primary_spa = spa; + primary_vdev = spa_get_primary_vdev(spa); + + nextboot = 0; + rc = vdev_read_pad2(primary_vdev, cmd, sizeof(cmd)); + if (vdev_clear_pad2(primary_vdev)) + printf("failed to clear pad2 area of primary vdev\n"); + if (rc == 0) { + if (*cmd) { + /* + * We could find an old-style ZFS Boot Block header here. + * Simply ignore it. + */ + if (*(uint64_t *)cmd != 0x2f5b007b10c) { + /* + * Note that parse() is destructive to cmd[] and we also want + * to honor RBX_QUIET option that could be present in cmd[]. + */ + nextboot = 1; + memcpy(cmddup, cmd, sizeof(cmd)); + if (parse_cmd()) { + printf("failed to parse pad2 area of primary vdev\n"); + reboot(); + } + if (!OPT_CHECK(RBX_QUIET)) + printf("zfs nextboot: %s\n", cmddup); + } + /* Do not process this command twice */ + *cmd = 0; + } + } else + printf("failed to read pad2 area of primary vdev\n"); + + /* Mount ZFS only if it's not already mounted via nextboot parsing. */ + if (zfsmount.spa == NULL && + (zfs_spa_init(spa) != 0 || zfs_mount(spa, 0, &zfsmount) != 0)) { + printf("%s: failed to mount default pool %s\n", + BOOTPROG, spa->spa_name); + autoboot = 0; + } else if (zfs_lookup(&zfsmount, PATH_CONFIG, &dn) == 0 || + zfs_lookup(&zfsmount, PATH_DOTCONFIG, &dn) == 0) { + off = 0; + zfs_read(spa, &dn, &off, cmd, sizeof(cmd)); + } + + if (*cmd) { + /* + * Note that parse_cmd() is destructive to cmd[] and we also want + * to honor RBX_QUIET option that could be present in cmd[]. + */ + memcpy(cmddup, cmd, sizeof(cmd)); + if (parse_cmd()) + autoboot = 0; + if (!OPT_CHECK(RBX_QUIET)) + printf("%s: %s\n", PATH_CONFIG, cmddup); + /* Do not process this command twice */ + *cmd = 0; + } + + /* Do not risk waiting at the prompt forever. */ + if (nextboot && !autoboot) + reboot(); + + /* + * Try to exec /boot/loader. If interrupted by a keypress, + * or in case of failure, try to load a kernel directly instead. + */ + + if (autoboot && !*kname) { + memcpy(kname, PATH_LOADER_ZFS, sizeof(PATH_LOADER_ZFS)); + if (!keyhit(3)) { + load(); + memcpy(kname, PATH_KERNEL, sizeof(PATH_KERNEL)); + } + } + + /* Present the user with the boot2 prompt. */ + + for (;;) { + if (!autoboot || !OPT_CHECK(RBX_QUIET)) { + printf("\nFreeBSD/x86 boot\n"); + if (zfs_rlookup(spa, zfsmount.rootobj, rootname) != 0) + printf("Default: %s/<0x%llx>:%s\n" + "boot: ", + spa->spa_name, zfsmount.rootobj, kname); + else if (rootname[0] != '\0') + printf("Default: %s/%s:%s\n" + "boot: ", + spa->spa_name, rootname, kname); + else + printf("Default: %s:%s\n" + "boot: ", + spa->spa_name, kname); + } + if (ioctrl & IO_SERIAL) + sio_flush(); + if (!autoboot || keyhit(5)) + getstr(cmd, sizeof(cmd)); + else if (!autoboot || !OPT_CHECK(RBX_QUIET)) + putchar('\n'); + autoboot = 0; + if (parse_cmd()) + putchar('\a'); + else + load(); + } +} + +/* XXX - Needed for btxld to link the boot2 binary; do not remove. */ +void +exit(int x) +{ + __exit(x); +} + +void +reboot(void) +{ + __exit(0); +} + +static void +load(void) +{ + union { + struct exec ex; + Elf32_Ehdr eh; + } hdr; + static Elf32_Phdr ep[2]; + static Elf32_Shdr es[2]; + caddr_t p; + dnode_phys_t dn; + off_t off; + uint32_t addr, x; + int fmt, i, j; + + if (zfs_lookup(&zfsmount, kname, &dn)) { + printf("\nCan't find %s\n", kname); + return; + } + off = 0; + if (xfsread(&dn, &off, &hdr, sizeof(hdr))) + return; + if (N_GETMAGIC(hdr.ex) == ZMAGIC) + fmt = 0; + else if (IS_ELF(hdr.eh)) + fmt = 1; + else { + printf("Invalid %s\n", "format"); + return; + } + if (fmt == 0) { + addr = hdr.ex.a_entry & 0xffffff; + p = PTOV(addr); + off = PAGE_SIZE; + if (xfsread(&dn, &off, p, hdr.ex.a_text)) + return; + p += roundup2(hdr.ex.a_text, PAGE_SIZE); + if (xfsread(&dn, &off, p, hdr.ex.a_data)) + return; + p += hdr.ex.a_data + roundup2(hdr.ex.a_bss, PAGE_SIZE); + bootinfo.bi_symtab = VTOP(p); + memcpy(p, &hdr.ex.a_syms, sizeof(hdr.ex.a_syms)); + p += sizeof(hdr.ex.a_syms); + if (hdr.ex.a_syms) { + if (xfsread(&dn, &off, p, hdr.ex.a_syms)) + return; + p += hdr.ex.a_syms; + if (xfsread(&dn, &off, p, sizeof(int))) + return; + x = *(uint32_t *)p; + p += sizeof(int); + x -= sizeof(int); + if (xfsread(&dn, &off, p, x)) + return; + p += x; + } + } else { + off = hdr.eh.e_phoff; + for (j = i = 0; i < hdr.eh.e_phnum && j < 2; i++) { + if (xfsread(&dn, &off, ep + j, sizeof(ep[0]))) + return; + if (ep[j].p_type == PT_LOAD) + j++; + } + for (i = 0; i < 2; i++) { + p = PTOV(ep[i].p_paddr & 0xffffff); + off = ep[i].p_offset; + if (xfsread(&dn, &off, p, ep[i].p_filesz)) + return; + } + p += roundup2(ep[1].p_memsz, PAGE_SIZE); + bootinfo.bi_symtab = VTOP(p); + if (hdr.eh.e_shnum == hdr.eh.e_shstrndx + 3) { + off = hdr.eh.e_shoff + sizeof(es[0]) * + (hdr.eh.e_shstrndx + 1); + if (xfsread(&dn, &off, &es, sizeof(es))) + return; + for (i = 0; i < 2; i++) { + memcpy(p, &es[i].sh_size, sizeof(es[i].sh_size)); + p += sizeof(es[i].sh_size); + off = es[i].sh_offset; + if (xfsread(&dn, &off, p, es[i].sh_size)) + return; + p += es[i].sh_size; + } + } + addr = hdr.eh.e_entry & 0xffffff; + } + bootinfo.bi_esymtab = VTOP(p); + bootinfo.bi_kernelname = VTOP(kname); + zfsargs.size = sizeof(zfsargs); + zfsargs.pool = zfsmount.spa->spa_guid; + zfsargs.root = zfsmount.rootobj; + zfsargs.primary_pool = primary_spa->spa_guid; +#ifdef LOADER_GELI_SUPPORT + explicit_bzero(gelipw, sizeof(gelipw)); + gelibuf = malloc(sizeof(struct keybuf) + (GELI_MAX_KEYS * sizeof(struct keybuf_ent))); + geli_fill_keybuf(gelibuf); + zfsargs.notapw = '\0'; + zfsargs.keybuf_sentinel = KEYBUF_SENTINEL; + zfsargs.keybuf = gelibuf; +#else + zfsargs.gelipw[0] = '\0'; +#endif + if (primary_vdev != NULL) + zfsargs.primary_vdev = primary_vdev->v_guid; + else + printf("failed to detect primary vdev\n"); + __exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK), + bootdev, + KARGS_FLAGS_ZFS | KARGS_FLAGS_EXTARG, + (uint32_t) spa->spa_guid, + (uint32_t) (spa->spa_guid >> 32), + VTOP(&bootinfo), + zfsargs); +} + +static int +zfs_mount_ds(char *dsname) +{ + uint64_t newroot; + spa_t *newspa; + char *q; + + q = strchr(dsname, '/'); + if (q) + *q++ = '\0'; + newspa = spa_find_by_name(dsname); + if (newspa == NULL) { + printf("\nCan't find ZFS pool %s\n", dsname); + return -1; + } + + if (zfs_spa_init(newspa)) + return -1; + + newroot = 0; + if (q) { + if (zfs_lookup_dataset(newspa, q, &newroot)) { + printf("\nCan't find dataset %s in ZFS pool %s\n", + q, newspa->spa_name); + return -1; + } + } + if (zfs_mount(newspa, newroot, &zfsmount)) { + printf("\nCan't mount ZFS dataset\n"); + return -1; + } + spa = newspa; + return (0); +} + +static int +parse_cmd(void) +{ + char *arg = cmd; + char *ep, *p, *q; + const char *cp; + int c, i, j; + + while ((c = *arg++)) { + if (c == ' ' || c == '\t' || c == '\n') + continue; + for (p = arg; *p && *p != '\n' && *p != ' ' && *p != '\t'; p++); + ep = p; + if (*p) + *p++ = 0; + if (c == '-') { + while ((c = *arg++)) { + if (c == 'P') { + if (*(uint8_t *)PTOV(0x496) & 0x10) { + cp = "yes"; + } else { + opts |= OPT_SET(RBX_DUAL) | OPT_SET(RBX_SERIAL); + cp = "no"; + } + printf("Keyboard: %s\n", cp); + continue; + } else if (c == 'S') { + j = 0; + while ((unsigned int)(i = *arg++ - '0') <= 9) + j = j * 10 + i; + if (j > 0 && i == -'0') { + comspeed = j; + break; + } + /* Fall through to error below ('S' not in optstr[]). */ + } + for (i = 0; c != optstr[i]; i++) + if (i == NOPT - 1) + return -1; + opts ^= OPT_SET(flags[i]); + } + ioctrl = OPT_CHECK(RBX_DUAL) ? (IO_SERIAL|IO_KEYBOARD) : + OPT_CHECK(RBX_SERIAL) ? IO_SERIAL : IO_KEYBOARD; + if (ioctrl & IO_SERIAL) { + if (sio_init(115200 / comspeed) != 0) + ioctrl &= ~IO_SERIAL; + } + } if (c == '?') { + dnode_phys_t dn; + + if (zfs_lookup(&zfsmount, arg, &dn) == 0) { + zap_list(spa, &dn); + } + return -1; + } else { + arg--; + + /* + * Report pool status if the comment is 'status'. Lets + * hope no-one wants to load /status as a kernel. + */ + if (!strcmp(arg, "status")) { + spa_all_status(); + return -1; + } + + /* + * If there is "zfs:" prefix simply ignore it. + */ + if (strncmp(arg, "zfs:", 4) == 0) + arg += 4; + + /* + * If there is a colon, switch pools. + */ + q = strchr(arg, ':'); + if (q) { + *q++ = '\0'; + if (zfs_mount_ds(arg) != 0) + return -1; + arg = q; + } + if ((i = ep - arg)) { + if ((size_t)i >= sizeof(kname)) + return -1; + memcpy(kname, arg, i + 1); + } + } + arg = p; + } + return 0; +} |
