| Current Path : /sys/boot/i386/zfsboot/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/boot/i386/zfsboot/zfsboot.c |
/*-
* 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: release/9.1.0/sys/boot/i386/zfsboot/zfsboot.c 237766 2012-06-29 10:19:15Z avg $");
#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 "util.h"
#include "cons.h"
#include "bootargs.h"
#include "libzfs.h"
#define PATH_DOTCONFIG "/boot.config"
#define PATH_CONFIG "/boot/config"
#define PATH_BOOT3 "/boot/zfsloader"
#define PATH_KERNEL "/boot/kernel/kernel"
#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
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 char *const dev_nm[NDEV] = {"ad", "da", "fd"};
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 (3 * 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);
static void load(void);
static int parse(void);
static void bios_getmem(void);
static void *
malloc(size_t n)
{
char *p = heap_next;
if (p + n > heap_end) {
printf("malloc failure\n");
for (;;)
;
return 0;
}
heap_next += n;
return p;
}
static char *
strdup(const char *s)
{
char *p = malloc(strlen(s) + 1);
strcpy(p, s);
return p;
}
#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;
/*
* 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;
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;
if (drvread(dsk, dmadat->rdbuf, lba, nb))
return -1;
memcpy(p, dmadat->rdbuf, nb * DEV_BSIZE);
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;
}
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.efl & 1) || (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.efl & 1)) {
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.efl & 0x1) && /* 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);
}
static void
probe_drive(struct dsk *dsk, spa_t **spap)
{
#ifdef GPT
struct gpt_hdr hdr;
struct gpt_ent *ent;
daddr_t slba, elba;
unsigned part, entries_per_sec;
#endif
struct dos_partition *dp;
char *sec;
unsigned i;
/*
* If we find a vdev on the whole disk, stop here. Otherwise dig
* out the MBR and probe each slice in turn for a vdev.
*/
if (vdev_probe(vdev_read, dsk, spap) == 0)
return;
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 presense 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.
*/
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;
if (vdev_probe(vdev_read, dsk, spap) == 0) {
/*
* We record the first pool we find (we will try
* to boot from that one).
*/
spap = NULL;
/*
* This slice had a vdev. We need a new dsk
* structure now since the vdev now owns this one.
*/
dsk = copy_dsk(dsk);
}
}
}
slba++;
}
return;
trymbr:
#endif
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;
if (vdev_probe(vdev_read, dsk, spap) == 0) {
/*
* We record the first pool we find (we will try to boot
* from that one.
*/
spap = 0;
/*
* This slice had a vdev. We need a new dsk structure now
* since the vdev now owns this one.
*/
dsk = copy_dsk(dsk);
}
}
}
int
main(void)
{
int autoboot, i;
dnode_phys_t dn;
off_t off;
struct dsk *dsk;
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->init = 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;
zfs_init();
/*
* Probe the boot drive first - we will try to boot from whatever
* pool we find on that drive.
*/
probe_drive(dsk, &spa);
/*
* 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->init = 0;
probe_drive(dsk, NULL);
}
/*
* If we didn't find a pool on the boot drive, default to the
* first pool we found, if any.
*/
if (!spa) {
spa = STAILQ_FIRST(&zfs_pools);
if (!spa) {
printf("%s: No ZFS pools located, can't boot\n", BOOTPROG);
for (;;)
;
}
}
if (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() 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())
autoboot = 0;
if (!OPT_CHECK(RBX_QUIET))
printf("%s: %s", PATH_CONFIG, cmddup);
/* Do not process this command twice */
*cmd = 0;
}
/*
* Try to exec stage 3 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_BOOT3, sizeof(PATH_BOOT3));
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
printf("Default: %s:%s:%s\n"
"boot: ",
spa->spa_name, rootname, 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())
putchar('\a');
else
load();
}
}
/* XXX - Needed for btxld to link the boot2 binary; do not remove. */
void
exit(int x)
{
}
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;
__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
parse(void)
{
char *arg = cmd;
char *ep, *p, *q;
const char *cp;
//unsigned int drv;
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)
sio_init(115200 / comspeed);
} 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 a colon, switch pools.
*/
q = (char *) strchr(arg, ':');
if (q) {
spa_t *newspa;
uint64_t newroot;
*q++ = 0;
newspa = spa_find_by_name(arg);
if (newspa) {
arg = q;
spa = newspa;
newroot = 0;
q = (char *) strchr(arg, ':');
if (q) {
*q++ = 0;
if (zfs_lookup_dataset(spa, arg, &newroot)) {
printf("\nCan't find dataset %s in ZFS pool %s\n",
arg, spa->spa_name);
return -1;
}
arg = q;
}
if (zfs_mount(spa, newroot, &zfsmount)) {
printf("\nCan't mount ZFS dataset\n");
return -1;
}
} else {
printf("\nCan't find ZFS pool %s\n", arg);
return -1;
}
}
if ((i = ep - arg)) {
if ((size_t)i >= sizeof(kname))
return -1;
memcpy(kname, arg, i + 1);
}
}
arg = p;
}
return 0;
}