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|
/* $OpenBSD: efidev.c,v 1.15 2016/01/03 15:01:31 krw Exp $ */
/*
* Copyright (c) 1996 Michael Shalayeff
* Copyright (c) 2003 Tobias Weingartner
* Copyright (c) 2015 YASUOKA Masahiko <yasuoka@yasuoka.net>
* 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 REGENTS 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 <sys/param.h>
#include <sys/reboot.h>
#include <sys/disklabel.h>
#include <lib/libz/zlib.h>
#include "libsa.h"
#include "disk.h"
#ifdef SOFTRAID
#include <dev/softraidvar.h>
#include "softraid.h"
#endif
#include <efi.h>
#include "eficall.h"
extern int debug;
#include "efidev.h"
#include "biosdev.h" /* for dklookup() */
#define EFI_BLKSPERSEC(_ed) ((_ed)->blkio->Media->BlockSize / DEV_BSIZE)
#define EFI_SECTOBLK(_ed, _n) ((_n) * EFI_BLKSPERSEC(_ed))
struct efi_diskinfo {
EFI_BLOCK_IO *blkio;
UINT32 mediaid;
};
int bios_bootdev;
static EFI_STATUS
efid_io(int, efi_diskinfo_t, u_int, int, void *);
static int efid_diskio(int, struct diskinfo *, u_int, int, void *);
static u_int findopenbsd(efi_diskinfo_t, const char **);
static uint64_t findopenbsd_gpt(efi_diskinfo_t, const char **);
static int gpt_chk_mbr(struct dos_partition *, u_int64_t);
void
efid_init(struct diskinfo *dip, void *handle)
{
EFI_BLOCK_IO *blkio = handle;
memset(dip, 0, sizeof(struct diskinfo));
dip->efi_info = alloc(sizeof(struct efi_diskinfo));
dip->efi_info->blkio = blkio;
dip->efi_info->mediaid = blkio->Media->MediaId;
dip->diskio = efid_diskio;
dip->strategy = efistrategy;
}
static EFI_STATUS
efid_io(int rw, efi_diskinfo_t ed, u_int off, int nsect, void *buf)
{
u_int blks, lba, i_lblks, i_tblks, i_nblks;
EFI_STATUS status = EFI_SUCCESS;
static u_char *iblk = NULL;
static u_int iblksz = 0;
/* block count of the intrisic block size in DEV_BSIZE */
blks = EFI_BLKSPERSEC(ed);
lba = off / blks;
/* leading and trailing unaligned blocks in intrisic block */
i_lblks = ((off % blks) == 0)? 0 : blks - (off % blks);
i_tblks = (off + nsect) % blks;
/* aligned blocks in intrisic block */
i_nblks = nsect - (i_lblks + i_tblks);
switch (rw) {
case F_READ:
/* allocate the space for reading unaligned blocks */
if (ed->blkio->Media->BlockSize != DEV_BSIZE) {
if (iblk && iblksz < ed->blkio->Media->BlockSize) {
free(iblk, iblksz);
iblk = NULL;
}
if (iblk == NULL) {
iblk = alloc(ed->blkio->Media->BlockSize);
iblksz = ed->blkio->Media->BlockSize;
}
}
if (i_lblks > 0) {
status = EFI_CALL(ed->blkio->ReadBlocks,
ed->blkio, ed->mediaid, lba - 1,
ed->blkio->Media->BlockSize, iblk);
if (EFI_ERROR(status))
goto on_eio;
memcpy(buf, iblk + (blks - i_lblks),
i_lblks * DEV_BSIZE);
}
if (i_nblks > 0) {
status = EFI_CALL(ed->blkio->ReadBlocks,
ed->blkio, ed->mediaid, lba,
ed->blkio->Media->BlockSize * (i_nblks / blks),
buf + (i_lblks * DEV_BSIZE));
if (EFI_ERROR(status))
goto on_eio;
}
if (i_tblks > 0) {
status = EFI_CALL(ed->blkio->ReadBlocks,
ed->blkio, ed->mediaid, lba + (i_nblks / blks),
ed->blkio->Media->BlockSize, iblk);
if (EFI_ERROR(status))
goto on_eio;
memcpy(buf + (i_lblks + i_nblks) * DEV_BSIZE, iblk,
i_tblks * DEV_BSIZE);
}
break;
case F_WRITE:
if (ed->blkio->Media->ReadOnly)
goto on_eio;
/* XXX not yet */
goto on_eio;
break;
}
return (EFI_SUCCESS);
on_eio:
return (status);
}
static int
efid_diskio(int rw, struct diskinfo *dip, u_int off, int nsect, void *buf)
{
EFI_STATUS status;
status = efid_io(rw, dip->efi_info, off, nsect, buf);
return ((EFI_ERROR(status))? -1 : 0);
}
/*
* Returns 0 if the MBR with the provided partition array is a GPT protective
* MBR, and returns 1 otherwise. A GPT protective MBR would have one and only
* one MBR partition, an EFI partition that either covers the whole disk or as
* much of it as is possible with a 32bit size field.
*
* Taken from kern/subr_disk.c.
*
* NOTE: MS always uses a size of UINT32_MAX for the EFI partition!**
*/
static int
gpt_chk_mbr(struct dos_partition *dp, u_int64_t dsize)
{
struct dos_partition *dp2;
int efi, found, i;
u_int32_t psize;
found = efi = 0;
for (dp2=dp, i=0; i < NDOSPART; i++, dp2++) {
if (dp2->dp_typ == DOSPTYP_UNUSED)
continue;
found++;
if (dp2->dp_typ != DOSPTYP_EFI)
continue;
psize = letoh32(dp2->dp_size);
if (psize == (dsize - 1) ||
psize == UINT32_MAX) {
if (letoh32(dp2->dp_start) == 1)
efi++;
}
}
if (found == 1 && efi == 1)
return (0);
return (1);
}
/*
* Try to read the bsd label on the given BIOS device.
*/
static u_int
findopenbsd(efi_diskinfo_t ed, const char **err)
{
EFI_STATUS status;
struct dos_mbr mbr;
struct dos_partition *dp;
uint64_t gptoff;
u_int mbroff = DOSBBSECTOR;
u_int mbr_eoff = DOSBBSECTOR; /* Offset of MBR extended partition. */
int i, maxebr = DOS_MAXEBR, nextebr;
again:
if (!maxebr--) {
*err = "too many extended partitions";
return (-1);
}
/* Read MBR */
bzero(&mbr, sizeof(mbr));
status = efid_io(F_READ, ed, mbroff, 1, &mbr);
if (EFI_ERROR(status)) {
*err = "Disk I/O Error";
return (-1);
}
/* check mbr signature */
if (mbr.dmbr_sign != DOSMBR_SIGNATURE) {
*err = "bad MBR signature\n";
return (-1);
}
/* check for GPT protective MBR. */
if (mbroff == DOSBBSECTOR && gpt_chk_mbr(mbr.dmbr_parts,
ed->blkio->Media->LastBlock + 1) == 0) {
gptoff = findopenbsd_gpt(ed, err);
if (gptoff > UINT_MAX || EFI_SECTOBLK(ed, gptoff) > UINT_MAX) {
*err = "Paritition LBA > 2**32";
return (-1);
}
if (gptoff == -1)
return (-1);
return EFI_SECTOBLK(ed, gptoff);
}
/* Search for OpenBSD partition */
nextebr = 0;
for (i = 0; i < NDOSPART; i++) {
dp = &mbr.dmbr_parts[i];
if (!dp->dp_size)
continue;
#ifdef BIOS_DEBUG
if (debug)
printf("found partition %u: "
"type %u (0x%x) offset %u (0x%x)\n",
(int)(dp - mbr.dmbr_parts),
dp->dp_typ, dp->dp_typ,
dp->dp_start, dp->dp_start);
#endif
if (dp->dp_typ == DOSPTYP_OPENBSD) {
if (dp->dp_start > (dp->dp_start + mbroff))
continue;
return (dp->dp_start + mbroff);
}
/*
* Record location of next ebr if and only if this is the first
* extended partition in this boot record!
*/
if (!nextebr && (dp->dp_typ == DOSPTYP_EXTEND ||
dp->dp_typ == DOSPTYP_EXTENDL)) {
nextebr = dp->dp_start + mbr_eoff;
if (nextebr < dp->dp_start)
nextebr = (u_int)-1;
if (mbr_eoff == DOSBBSECTOR)
mbr_eoff = dp->dp_start;
}
}
if (nextebr && nextebr != (u_int)-1) {
mbroff = nextebr;
goto again;
}
return (-1);
}
/* call this only if LBA1 == GPT */
static uint64_t
findopenbsd_gpt(efi_diskinfo_t ed, const char **err)
{
EFI_STATUS status;
struct gpt_header gh;
int i, part, found;
uint64_t lba;
uint32_t orig_csum, new_csum;
uint32_t ghsize, ghpartsize, ghpartnum, ghpartspersec;
uint32_t gpsectors;
const char openbsd_uuid_code[] = GPT_UUID_OPENBSD;
struct gpt_partition gp;
static struct uuid *openbsd_uuid = NULL, openbsd_uuid_space;
static u_char buf[4096];
/* Prepare OpenBSD UUID */
if (openbsd_uuid == NULL) {
/* XXX: should be replaced by uuid_dec_be() */
memcpy(&openbsd_uuid_space, openbsd_uuid_code,
sizeof(openbsd_uuid_space));
openbsd_uuid_space.time_low =
betoh32(openbsd_uuid_space.time_low);
openbsd_uuid_space.time_mid =
betoh16(openbsd_uuid_space.time_mid);
openbsd_uuid_space.time_hi_and_version =
betoh16(openbsd_uuid_space.time_hi_and_version);
openbsd_uuid = &openbsd_uuid_space;
}
if (EFI_BLKSPERSEC(ed) > 8) {
*err = "disk sector > 4096 bytes\n";
return (-1);
}
/* LBA1: GPT Header */
lba = 1;
status = efid_io(F_READ, ed, EFI_SECTOBLK(ed, lba), EFI_BLKSPERSEC(ed),
buf);
if (EFI_ERROR(status)) {
*err = "Disk I/O Error";
return (-1);
}
memcpy(&gh, buf, sizeof(gh));
/* Check signature */
if (letoh64(gh.gh_sig) != GPTSIGNATURE) {
*err = "bad GPT signature\n";
return (-1);
}
if (letoh32(gh.gh_rev) != GPTREVISION) {
*err = "bad GPT revision\n";
return (-1);
}
ghsize = letoh32(gh.gh_size);
if (ghsize < GPTMINHDRSIZE || ghsize > sizeof(struct gpt_header)) {
*err = "bad GPT header size\n";
return (-1);
}
/* Check checksum */
orig_csum = gh.gh_csum;
gh.gh_csum = 0;
new_csum = crc32(0, (unsigned char *)&gh, ghsize);
gh.gh_csum = orig_csum;
if (letoh32(orig_csum) != new_csum) {
*err = "bad GPT header checksum\n";
return (-1);
}
lba = letoh64(gh.gh_part_lba);
ghpartsize = letoh32(gh.gh_part_size);
ghpartspersec = ed->blkio->Media->BlockSize / ghpartsize;
ghpartnum = letoh32(gh.gh_part_num);
gpsectors = (ghpartnum + ghpartspersec - 1) / ghpartspersec;
new_csum = crc32(0L, Z_NULL, 0);
found = 0;
for (i = 0; i < gpsectors; i++, lba++) {
status = efid_io(F_READ, ed, EFI_SECTOBLK(ed, lba),
EFI_BLKSPERSEC(ed), buf);
if (EFI_ERROR(status)) {
*err = "Disk I/O Error";
return (-1);
}
for (part = 0; part < ghpartspersec; part++) {
if (ghpartnum == 0)
break;
new_csum = crc32(new_csum, buf + part * sizeof(gp),
sizeof(gp));
ghpartnum--;
if (found)
continue;
memcpy(&gp, buf + part * sizeof(gp), sizeof(gp));
if (memcmp(&gp.gp_type, openbsd_uuid,
sizeof(struct uuid)) == 0)
found = 1;
}
}
if (found && new_csum == letoh32(gh.gh_part_csum))
return letoh64(gp.gp_lba_start);
return (-1);
}
const char *
efi_getdisklabel(efi_diskinfo_t ed, struct disklabel *label)
{
u_int start = 0;
char buf[DEV_BSIZE];
const char *err = NULL;
int error;
/* Sanity check */
/* XXX */
start = findopenbsd(ed, &err);
if (start == (u_int)-1) {
if (err != NULL)
return (err);
return "no OpenBSD partition\n";
}
/* Load BSD disklabel */
#ifdef BIOS_DEBUG
if (debug)
printf("loading disklabel @ %u\n", start + DOS_LABELSECTOR);
#endif
/* read disklabel */
error = efid_io(F_READ, ed, start + DOS_LABELSECTOR, 1, buf);
if (error)
return "failed to read disklabel";
/* Fill in disklabel */
return (getdisklabel(buf, label));
}
int
efiopen(struct open_file *f, ...)
{
#ifdef SOFTRAID
struct sr_boot_volume *bv;
#endif
register char *cp, **file;
dev_t maj, unit, part;
struct diskinfo *dip;
int biosdev, devlen;
#if 0
const char *st;
#endif
va_list ap;
char *dev;
va_start(ap, f);
cp = *(file = va_arg(ap, char **));
va_end(ap);
#ifdef EFI_DEBUG
if (debug)
printf("%s\n", cp);
#endif
f->f_devdata = NULL;
/* Search for device specification. */
dev = cp;
if (cp[4] == ':')
devlen = 2;
else if (cp[5] == ':')
devlen = 3;
else
return ENOENT;
cp += devlen;
/* Get unit. */
if ('0' <= *cp && *cp <= '9')
unit = *cp++ - '0';
else {
printf("Bad unit number\n");
return EUNIT;
}
/* Get partition. */
if ('a' <= *cp && *cp <= 'p')
part = *cp++ - 'a';
else {
printf("Bad partition\n");
return EPART;
}
/* Get filename. */
cp++; /* skip ':' */
if (*cp != 0)
*file = cp;
else
f->f_flags |= F_RAW;
#ifdef SOFTRAID
/* Intercept softraid disks. */
if (strncmp("sr", dev, 2) == 0) {
/* Create a fake diskinfo for this softraid volume. */
SLIST_FOREACH(bv, &sr_volumes, sbv_link)
if (bv->sbv_unit == unit)
break;
if (bv == NULL) {
printf("Unknown device: sr%d\n", unit);
return EADAPT;
}
if (bv->sbv_level == 'C' && bv->sbv_keys == NULL)
if (sr_crypto_decrypt_keys(bv) != 0)
return EPERM;
if (bv->sbv_diskinfo == NULL) {
dip = alloc(sizeof(struct diskinfo));
bzero(dip, sizeof(*dip));
dip->diskio = efid_diskio;
dip->strategy = efistrategy;
bv->sbv_diskinfo = dip;
dip->sr_vol = bv;
dip->bios_info.flags |= BDI_BADLABEL;
}
dip = bv->sbv_diskinfo;
if (dip->bios_info.flags & BDI_BADLABEL) {
/* Attempt to read disklabel. */
bv->sbv_part = 'c';
if (sr_getdisklabel(bv, &dip->disklabel))
return ERDLAB;
dip->bios_info.flags &= ~BDI_BADLABEL;
}
bv->sbv_part = part + 'a';
bootdev_dip = dip;
f->f_devdata = dip;
return 0;
}
#endif
for (maj = 0; maj < nbdevs &&
strncmp(dev, bdevs[maj], devlen); maj++);
if (maj >= nbdevs) {
printf("Unknown device: ");
for (cp = *file; *cp != ':'; cp++)
putchar(*cp);
putchar('\n');
return EADAPT;
}
biosdev = unit;
switch (maj) {
case 0: /* wd */
case 4: /* sd */
case 17: /* hd */
biosdev |= 0x80;
break;
case 2: /* fd */
break;
case 6: /* cd */
biosdev = bios_bootdev & 0xff;
break;
default:
return ENXIO;
}
/* Find device */
dip = dklookup(biosdev);
if (dip == NULL)
return ENXIO;
bootdev_dip = dip;
/* Fix up bootdev */
{ dev_t bsd_dev;
bsd_dev = dip->bios_info.bsd_dev;
dip->bsddev = MAKEBOOTDEV(B_TYPE(bsd_dev), B_ADAPTOR(bsd_dev),
B_CONTROLLER(bsd_dev), unit, part);
dip->bootdev = MAKEBOOTDEV(B_TYPE(bsd_dev), B_ADAPTOR(bsd_dev),
B_CONTROLLER(bsd_dev), B_UNIT(bsd_dev), part);
}
#if 0
dip->bios_info.bsd_dev = dip->bootdev;
bootdev = dip->bootdev;
#endif
#ifdef EFI_DEBUG
if (debug) {
printf("BIOS geometry: heads=%u, s/t=%u; EDD=%d\n",
dip->bios_info.bios_heads, dip->bios_info.bios_sectors,
dip->bios_info.bios_edd);
}
#endif
#if 0
/*
* XXX In UEFI, media change can be detected by MediaID
*/
/* Try for disklabel again (might be removable media) */
if (dip->bios_info.flags & BDI_BADLABEL) {
st = efi_getdisklabel(dip->efi_info, &dip->disklabel);
#ifdef EFI_DEBUG
if (debug && st)
printf("%s\n", st);
#endif
if (!st) {
dip->bios_info.flags &= ~BDI_BADLABEL;
dip->bios_info.flags |= BDI_GOODLABEL;
} else
return ERDLAB;
}
#endif
f->f_devdata = dip;
return 0;
}
int
efistrategy(void *devdata, int rw, daddr32_t blk, size_t size, void *buf,
size_t *rsize)
{
struct diskinfo *dip = (struct diskinfo *)devdata;
u_int8_t error = 0;
size_t nsect;
#ifdef SOFTRAID
/* Intercept strategy for softraid volumes. */
if (dip->sr_vol)
return sr_strategy(dip->sr_vol, rw, blk, size, buf, rsize);
#endif
nsect = (size + DEV_BSIZE - 1) / DEV_BSIZE;
blk += dip->disklabel.d_partitions[B_PARTITION(dip->bsddev)].p_offset;
if (blk < 0)
error = EINVAL;
else
error = dip->diskio(rw, dip, blk, nsect, buf);
#ifdef EFI_DEBUG
if (debug) {
if (error != 0)
printf("=0x%x(%s)", error, error);
putchar('\n');
}
#endif
if (rsize != NULL)
*rsize = nsect * DEV_BSIZE;
return (error);
}
int
eficlose(struct open_file *f)
{
f->f_devdata = NULL;
return 0;
}
int
efiioctl(struct open_file *f, u_long cmd, void *data)
{
return 0;
}
void
efi_dump_diskinfo(void)
{
efi_diskinfo_t ed;
struct diskinfo *dip;
bios_diskinfo_t *bdi;
uint64_t siz;
const char *sizu;
printf("Disk\tBlkSiz\tIoAlign\tSize\tFlags\tChecksum\n");
TAILQ_FOREACH(dip, &disklist, list) {
bdi = &dip->bios_info;
ed = dip->efi_info;
siz = (ed->blkio->Media->LastBlock + 1) *
ed->blkio->Media->BlockSize;
siz /= 1024 * 1024;
if (siz < 10000)
sizu = "MB";
else {
siz /= 1024;
sizu = "GB";
}
printf("hd%d\t%u\t%u\t%u%s\t0x%x\t0x%x\t%s\n",
(bdi->bios_number & 0x7f),
ed->blkio->Media->BlockSize,
ed->blkio->Media->IoAlign, siz, sizu,
bdi->flags, bdi->checksum,
(ed->blkio->Media->RemovableMedia)? "Removable" : "");
}
}
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