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grub/grub-core/disk/efi/efidisk.c
Andrey Borzenkov 44016e527a * grub-core/disk/efi/efidisk.c (grub_efidisk_get_device_name): 
Handle CD-ROMs.
2013-10-14 17:06:39 +02:00

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2006,2007,2008 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/disk.h>
#include <grub/partition.h>
#include <grub/mm.h>
#include <grub/types.h>
#include <grub/misc.h>
#include <grub/err.h>
#include <grub/term.h>
#include <grub/efi/api.h>
#include <grub/efi/efi.h>
#include <grub/efi/disk.h>
struct grub_efidisk_data
{
grub_efi_handle_t handle;
grub_efi_device_path_t *device_path;
grub_efi_device_path_t *last_device_path;
grub_efi_block_io_t *block_io;
struct grub_efidisk_data *next;
};
/* GUID. */
static grub_efi_guid_t block_io_guid = GRUB_EFI_BLOCK_IO_GUID;
static struct grub_efidisk_data *fd_devices;
static struct grub_efidisk_data *hd_devices;
static struct grub_efidisk_data *cd_devices;
/* Duplicate a device path. */
static grub_efi_device_path_t *
duplicate_device_path (const grub_efi_device_path_t *dp)
{
grub_efi_device_path_t *p;
grub_size_t total_size = 0;
for (p = (grub_efi_device_path_t *) dp;
;
p = GRUB_EFI_NEXT_DEVICE_PATH (p))
{
total_size += GRUB_EFI_DEVICE_PATH_LENGTH (p);
if (GRUB_EFI_END_ENTIRE_DEVICE_PATH (p))
break;
}
p = grub_malloc (total_size);
if (! p)
return 0;
grub_memcpy (p, dp, total_size);
return p;
}
/* Return the device path node right before the end node. */
static grub_efi_device_path_t *
find_last_device_path (const grub_efi_device_path_t *dp)
{
grub_efi_device_path_t *next, *p;
if (GRUB_EFI_END_ENTIRE_DEVICE_PATH (dp))
return 0;
for (p = (grub_efi_device_path_t *) dp, next = GRUB_EFI_NEXT_DEVICE_PATH (p);
! GRUB_EFI_END_ENTIRE_DEVICE_PATH (next);
p = next, next = GRUB_EFI_NEXT_DEVICE_PATH (next))
;
return p;
}
static struct grub_efidisk_data *
make_devices (void)
{
grub_efi_uintn_t num_handles;
grub_efi_handle_t *handles;
grub_efi_handle_t *handle;
struct grub_efidisk_data *devices = 0;
/* Find handles which support the disk io interface. */
handles = grub_efi_locate_handle (GRUB_EFI_BY_PROTOCOL, &block_io_guid,
0, &num_handles);
if (! handles)
return 0;
/* Make a linked list of devices. */
for (handle = handles; num_handles--; handle++)
{
grub_efi_device_path_t *dp;
grub_efi_device_path_t *ldp;
struct grub_efidisk_data *d;
grub_efi_block_io_t *bio;
dp = grub_efi_get_device_path (*handle);
if (! dp)
continue;
ldp = find_last_device_path (dp);
if (! ldp)
/* This is empty. Why? */
continue;
bio = grub_efi_open_protocol (*handle, &block_io_guid,
GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (! bio)
/* This should not happen... Why? */
continue;
d = grub_malloc (sizeof (*d));
if (! d)
{
/* Uggh. */
grub_free (handles);
return 0;
}
d->handle = *handle;
d->device_path = dp;
d->last_device_path = ldp;
d->block_io = bio;
d->next = devices;
devices = d;
}
grub_free (handles);
return devices;
}
/* Find the parent device. */
static struct grub_efidisk_data *
find_parent_device (struct grub_efidisk_data *devices,
struct grub_efidisk_data *d)
{
grub_efi_device_path_t *dp, *ldp;
struct grub_efidisk_data *parent;
dp = duplicate_device_path (d->device_path);
if (! dp)
return 0;
ldp = find_last_device_path (dp);
ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
ldp->length[0] = sizeof (*ldp);
ldp->length[1] = 0;
for (parent = devices; parent; parent = parent->next)
{
/* Ignore itself. */
if (parent == d)
continue;
if (grub_efi_compare_device_paths (parent->device_path, dp) == 0)
break;
}
grub_free (dp);
return parent;
}
static int
is_child (struct grub_efidisk_data *child,
struct grub_efidisk_data *parent)
{
grub_efi_device_path_t *dp, *ldp;
int ret;
dp = duplicate_device_path (child->device_path);
if (! dp)
return 0;
ldp = find_last_device_path (dp);
ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
ldp->length[0] = sizeof (*ldp);
ldp->length[1] = 0;
ret = (grub_efi_compare_device_paths (dp, parent->device_path) == 0);
grub_free (dp);
return ret;
}
#define FOR_CHILDREN(p, dev) for (p = dev; p; p = p->next) if (is_child (p, d))
/* Add a device into a list of devices in an ascending order. */
static void
add_device (struct grub_efidisk_data **devices, struct grub_efidisk_data *d)
{
struct grub_efidisk_data **p;
struct grub_efidisk_data *n;
for (p = devices; *p; p = &((*p)->next))
{
int ret;
ret = grub_efi_compare_device_paths (find_last_device_path ((*p)->device_path),
find_last_device_path (d->device_path));
if (ret == 0)
ret = grub_efi_compare_device_paths ((*p)->device_path,
d->device_path);
if (ret == 0)
return;
else if (ret > 0)
break;
}
n = grub_malloc (sizeof (*n));
if (! n)
return;
grub_memcpy (n, d, sizeof (*n));
n->next = (*p);
(*p) = n;
}
/* Name the devices. */
static void
name_devices (struct grub_efidisk_data *devices)
{
struct grub_efidisk_data *d;
/* First, identify devices by media device paths. */
for (d = devices; d; d = d->next)
{
grub_efi_device_path_t *dp;
dp = d->last_device_path;
if (! dp)
continue;
if (GRUB_EFI_DEVICE_PATH_TYPE (dp) == GRUB_EFI_MEDIA_DEVICE_PATH_TYPE)
{
int is_hard_drive = 0;
switch (GRUB_EFI_DEVICE_PATH_SUBTYPE (dp))
{
case GRUB_EFI_HARD_DRIVE_DEVICE_PATH_SUBTYPE:
is_hard_drive = 1;
/* Fall through by intention. */
case GRUB_EFI_CDROM_DEVICE_PATH_SUBTYPE:
{
struct grub_efidisk_data *parent, *parent2;
parent = find_parent_device (devices, d);
if (!parent)
{
#ifdef DEBUG_NAMES
grub_printf ("skipping orphaned partition: ");
grub_efi_print_device_path (d->device_path);
#endif
break;
}
parent2 = find_parent_device (devices, parent);
if (parent2)
{
#ifdef DEBUG_NAMES
grub_printf ("skipping subpartition: ");
grub_efi_print_device_path (d->device_path);
#endif
/* Mark itself as used. */
d->last_device_path = 0;
break;
}
if (!parent->last_device_path)
{
d->last_device_path = 0;
break;
}
if (is_hard_drive)
{
#ifdef DEBUG_NAMES
grub_printf ("adding a hard drive by a partition: ");
grub_efi_print_device_path (parent->device_path);
#endif
add_device (&hd_devices, parent);
}
else
{
#ifdef DEBUG_NAMES
grub_printf ("adding a cdrom by a partition: ");
grub_efi_print_device_path (parent->device_path);
#endif
add_device (&cd_devices, parent);
}
/* Mark the parent as used. */
parent->last_device_path = 0;
}
/* Mark itself as used. */
d->last_device_path = 0;
break;
default:
#ifdef DEBUG_NAMES
grub_printf ("skipping other type: ");
grub_efi_print_device_path (d->device_path);
#endif
/* For now, ignore the others. */
break;
}
}
else
{
#ifdef DEBUG_NAMES
grub_printf ("skipping non-media: ");
grub_efi_print_device_path (d->device_path);
#endif
}
}
/* Let's see what can be added more. */
for (d = devices; d; d = d->next)
{
grub_efi_device_path_t *dp;
grub_efi_block_io_media_t *m;
int is_floppy = 0;
dp = d->last_device_path;
if (! dp)
continue;
m = d->block_io->media;
if (GRUB_EFI_DEVICE_PATH_TYPE (dp) == GRUB_EFI_ACPI_DEVICE_PATH_TYPE
&& GRUB_EFI_DEVICE_PATH_SUBTYPE (dp)
== GRUB_EFI_ACPI_DEVICE_PATH_SUBTYPE)
{
grub_efi_acpi_device_path_t *acpi
= (grub_efi_acpi_device_path_t *) dp;
/* Floppy EISA ID. */
if (acpi->hid == 0x60441d0 || acpi->hid == 0x70041d0
|| acpi->hid == 0x70141d1)
is_floppy = 1;
}
if (is_floppy)
{
#ifdef DEBUG_NAMES
grub_printf ("adding a floppy: ");
grub_efi_print_device_path (d->device_path);
#endif
add_device (&fd_devices, d);
}
else if (m->read_only && m->block_size > GRUB_DISK_SECTOR_SIZE)
{
/* This check is too heuristic, but assume that this is a
CDROM drive. */
#ifdef DEBUG_NAMES
grub_printf ("adding a cdrom by guessing: ");
grub_efi_print_device_path (d->device_path);
#endif
add_device (&cd_devices, d);
}
else
{
/* The default is a hard drive. */
#ifdef DEBUG_NAMES
grub_printf ("adding a hard drive by guessing: ");
grub_efi_print_device_path (d->device_path);
#endif
add_device (&hd_devices, d);
}
}
}
static void
free_devices (struct grub_efidisk_data *devices)
{
struct grub_efidisk_data *p, *q;
for (p = devices; p; p = q)
{
q = p->next;
grub_free (p);
}
}
/* Enumerate all disks to name devices. */
static void
enumerate_disks (void)
{
struct grub_efidisk_data *devices;
devices = make_devices ();
if (! devices)
return;
name_devices (devices);
free_devices (devices);
}
static int
grub_efidisk_iterate (grub_disk_dev_iterate_hook_t hook, void *hook_data,
grub_disk_pull_t pull)
{
struct grub_efidisk_data *d;
char buf[16];
int count;
switch (pull)
{
case GRUB_DISK_PULL_NONE:
for (d = hd_devices, count = 0; d; d = d->next, count++)
{
grub_snprintf (buf, sizeof (buf), "hd%d", count);
grub_dprintf ("efidisk", "iterating %s\n", buf);
if (hook (buf, hook_data))
return 1;
}
break;
case GRUB_DISK_PULL_REMOVABLE:
for (d = fd_devices, count = 0; d; d = d->next, count++)
{
grub_snprintf (buf, sizeof (buf), "fd%d", count);
grub_dprintf ("efidisk", "iterating %s\n", buf);
if (hook (buf, hook_data))
return 1;
}
for (d = cd_devices, count = 0; d; d = d->next, count++)
{
grub_snprintf (buf, sizeof (buf), "cd%d", count);
grub_dprintf ("efidisk", "iterating %s\n", buf);
if (hook (buf, hook_data))
return 1;
}
break;
default:
return 0;
}
return 0;
}
static int
get_drive_number (const char *name)
{
unsigned long drive;
if ((name[0] != 'f' && name[0] != 'h' && name[0] != 'c') || name[1] != 'd')
goto fail;
drive = grub_strtoul (name + 2, 0, 10);
if (grub_errno != GRUB_ERR_NONE)
goto fail;
return (int) drive ;
fail:
grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a efidisk");
return -1;
}
static struct grub_efidisk_data *
get_device (struct grub_efidisk_data *devices, int num)
{
struct grub_efidisk_data *d;
for (d = devices; d && num; d = d->next, num--)
;
if (num == 0)
return d;
return 0;
}
static grub_err_t
grub_efidisk_open (const char *name, struct grub_disk *disk)
{
int num;
struct grub_efidisk_data *d = 0;
grub_efi_block_io_media_t *m;
grub_dprintf ("efidisk", "opening %s\n", name);
num = get_drive_number (name);
if (num < 0)
return grub_errno;
switch (name[0])
{
case 'f':
d = get_device (fd_devices, num);
break;
case 'c':
d = get_device (cd_devices, num);
break;
case 'h':
d = get_device (hd_devices, num);
break;
default:
/* Never reach here. */
break;
}
if (! d)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "no such device");
disk->id = ((num << GRUB_CHAR_BIT) | name[0]);
m = d->block_io->media;
/* FIXME: Probably it is better to store the block size in the disk,
and total sectors should be replaced with total blocks. */
grub_dprintf ("efidisk", "m = %p, last block = %llx, block size = %x\n",
m, (unsigned long long) m->last_block, m->block_size);
disk->total_sectors = m->last_block + 1;
if (m->block_size & (m->block_size - 1) || !m->block_size)
return grub_error (GRUB_ERR_IO, "invalid sector size %d",
m->block_size);
for (disk->log_sector_size = 0;
(1U << disk->log_sector_size) < m->block_size;
disk->log_sector_size++);
disk->data = d;
grub_dprintf ("efidisk", "opening %s succeeded\n", name);
return GRUB_ERR_NONE;
}
static void
grub_efidisk_close (struct grub_disk *disk __attribute__ ((unused)))
{
/* EFI disks do not allocate extra memory, so nothing to do here. */
grub_dprintf ("efidisk", "closing %s\n", disk->name);
}
static grub_efi_status_t
grub_efidisk_readwrite (struct grub_disk *disk, grub_disk_addr_t sector,
grub_size_t size, char *buf, int wr)
{
/* For now, use the disk io interface rather than the block io's. */
struct grub_efidisk_data *d;
grub_efi_block_io_t *bio;
grub_efi_status_t status;
d = disk->data;
bio = d->block_io;
while (size > 0)
{
grub_size_t len;
len = 0x500;
if (len > size)
len = size;
status = efi_call_5 ((wr ? bio->write_blocks : bio->read_blocks), bio,
bio->media->media_id,
(grub_efi_uint64_t) sector,
(grub_efi_uintn_t) len << disk->log_sector_size,
buf);
size -= len;
buf += len << disk->log_sector_size;
sector += len;
if (status != GRUB_EFI_SUCCESS)
return status;
}
return GRUB_EFI_SUCCESS;
}
static grub_err_t
grub_efidisk_read (struct grub_disk *disk, grub_disk_addr_t sector,
grub_size_t size, char *buf)
{
grub_efi_status_t status;
grub_dprintf ("efidisk",
"reading 0x%lx sectors at the sector 0x%llx from %s\n",
(unsigned long) size, (unsigned long long) sector, disk->name);
status = grub_efidisk_readwrite (disk, sector, size, buf, 0);
if (status != GRUB_EFI_SUCCESS)
return grub_error (GRUB_ERR_READ_ERROR,
N_("failure reading sector 0x%llx from `%s'"),
(unsigned long long) sector,
disk->name);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_efidisk_write (struct grub_disk *disk, grub_disk_addr_t sector,
grub_size_t size, const char *buf)
{
grub_efi_status_t status;
grub_dprintf ("efidisk",
"writing 0x%lx sectors at the sector 0x%llx to %s\n",
(unsigned long) size, (unsigned long long) sector, disk->name);
status = grub_efidisk_readwrite (disk, sector, size, (char *) buf, 1);
if (status != GRUB_EFI_SUCCESS)
return grub_error (GRUB_ERR_WRITE_ERROR,
N_("failure writing sector 0x%llx to `%s'"),
(unsigned long long) sector, disk->name);
return GRUB_ERR_NONE;
}
static struct grub_disk_dev grub_efidisk_dev =
{
.name = "efidisk",
.id = GRUB_DISK_DEVICE_EFIDISK_ID,
.iterate = grub_efidisk_iterate,
.open = grub_efidisk_open,
.close = grub_efidisk_close,
.read = grub_efidisk_read,
.write = grub_efidisk_write,
.next = 0
};
void
grub_efidisk_fini (void)
{
free_devices (fd_devices);
free_devices (hd_devices);
free_devices (cd_devices);
fd_devices = 0;
hd_devices = 0;
cd_devices = 0;
grub_disk_dev_unregister (&grub_efidisk_dev);
}
void
grub_efidisk_init (void)
{
grub_disk_firmware_fini = grub_efidisk_fini;
enumerate_disks ();
grub_disk_dev_register (&grub_efidisk_dev);
}
/* Some utility functions to map GRUB devices with EFI devices. */
grub_efi_handle_t
grub_efidisk_get_device_handle (grub_disk_t disk)
{
struct grub_efidisk_data *d;
char type;
if (disk->dev->id != GRUB_DISK_DEVICE_EFIDISK_ID)
return 0;
d = disk->data;
type = disk->name[0];
switch (type)
{
case 'f':
/* This is the simplest case. */
return d->handle;
case 'c':
/* FIXME: probably this is not correct. */
return d->handle;
case 'h':
/* If this is the whole disk, just return its own data. */
if (! disk->partition)
return d->handle;
/* Otherwise, we must query the corresponding device to the firmware. */
{
struct grub_efidisk_data *devices;
grub_efi_handle_t handle = 0;
struct grub_efidisk_data *c;
devices = make_devices ();
FOR_CHILDREN (c, devices)
{
grub_efi_hard_drive_device_path_t hd;
grub_memcpy (&hd, c->last_device_path, sizeof (hd));
if ((GRUB_EFI_DEVICE_PATH_TYPE (c->last_device_path)
== GRUB_EFI_MEDIA_DEVICE_PATH_TYPE)
&& (GRUB_EFI_DEVICE_PATH_SUBTYPE (c->last_device_path)
== GRUB_EFI_HARD_DRIVE_DEVICE_PATH_SUBTYPE)
&& (grub_partition_get_start (disk->partition)
== (hd.partition_start << (disk->log_sector_size
- GRUB_DISK_SECTOR_BITS)))
&& (grub_partition_get_len (disk->partition)
== (hd.partition_size << (disk->log_sector_size
- GRUB_DISK_SECTOR_BITS))))
{
handle = c->handle;
break;
}
}
free_devices (devices);
if (handle != 0)
return handle;
}
break;
default:
break;
}
return 0;
}
#define NEEDED_BUFLEN sizeof ("XdXXXXXXXXXX")
static inline int
get_diskname_from_path_real (const grub_efi_device_path_t *path,
struct grub_efidisk_data *head,
char *buf)
{
int count = 0;
struct grub_efidisk_data *d;
for (d = head, count = 0; d; d = d->next, count++)
if (grub_efi_compare_device_paths (d->device_path, path) == 0)
{
grub_snprintf (buf, NEEDED_BUFLEN - 1, "d%d", count);
return 1;
}
return 0;
}
static inline int
get_diskname_from_path (const grub_efi_device_path_t *path,
char *buf)
{
if (get_diskname_from_path_real (path, hd_devices, buf + 1))
{
buf[0] = 'h';
return 1;
}
if (get_diskname_from_path_real (path, fd_devices, buf + 1))
{
buf[0] = 'f';
return 1;
}
if (get_diskname_from_path_real (path, cd_devices, buf + 1))
{
buf[0] = 'c';
return 1;
}
return 0;
}
/* Context for grub_efidisk_get_device_name. */
struct grub_efidisk_get_device_name_ctx
{
char *partition_name;
grub_efi_hard_drive_device_path_t hd;
};
/* Helper for grub_efidisk_get_device_name.
Find the identical partition. */
static int
grub_efidisk_get_device_name_iter (grub_disk_t disk,
const grub_partition_t part, void *data)
{
struct grub_efidisk_get_device_name_ctx *ctx = data;
if (grub_partition_get_start (part)
== (ctx->hd.partition_start << (disk->log_sector_size
- GRUB_DISK_SECTOR_BITS))
&& grub_partition_get_len (part)
== (ctx->hd.partition_size << (disk->log_sector_size
- GRUB_DISK_SECTOR_BITS)))
{
ctx->partition_name = grub_partition_get_name (part);
return 1;
}
return 0;
}
char *
grub_efidisk_get_device_name (grub_efi_handle_t *handle)
{
grub_efi_device_path_t *dp, *ldp;
char device_name[NEEDED_BUFLEN];
dp = grub_efi_get_device_path (handle);
if (! dp)
return 0;
ldp = find_last_device_path (dp);
if (! ldp)
return 0;
if (GRUB_EFI_DEVICE_PATH_TYPE (ldp) == GRUB_EFI_MEDIA_DEVICE_PATH_TYPE)
{
int is_cdrom = 0;
switch (GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp))
{
case GRUB_EFI_CDROM_DEVICE_PATH_SUBTYPE:
is_cdrom = 1;
/* Intentionally fall through */
case GRUB_EFI_HARD_DRIVE_DEVICE_PATH_SUBTYPE:
{
struct grub_efidisk_get_device_name_ctx ctx;
char *dev_name;
grub_efi_device_path_t *dup_dp, *dup_ldp;
grub_disk_t parent = 0;
/* It is necessary to duplicate the device path so that GRUB
can overwrite it. */
dup_dp = duplicate_device_path (dp);
if (! dup_dp)
return 0;
dup_ldp = find_last_device_path (dup_dp);
dup_ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
dup_ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
dup_ldp->length[0] = sizeof (*dup_ldp);
dup_ldp->length[1] = 0;
if (!get_diskname_from_path (dup_dp, device_name))
{
grub_free (dup_dp);
return 0;
}
parent = grub_disk_open (device_name);
grub_free (dup_dp);
if (! parent)
return 0;
/* Find a partition which matches the hard drive device path. */
ctx.partition_name = NULL;
grub_memcpy (&ctx.hd, ldp, sizeof (ctx.hd));
if (ctx.hd.partition_start == 0
&& (ctx.hd.partition_size << (parent->log_sector_size
- GRUB_DISK_SECTOR_BITS))
== grub_disk_get_size (parent))
{
dev_name = grub_strdup (parent->name);
}
else
{
grub_partition_iterate (parent, grub_efidisk_get_device_name_iter,
&ctx);
if (! ctx.partition_name)
{
grub_disk_close (parent);
if (is_cdrom)
return grub_strdup (device_name);
return 0;
}
dev_name = grub_xasprintf ("%s,%s", parent->name,
ctx.partition_name);
grub_free (ctx.partition_name);
}
grub_disk_close (parent);
return dev_name;
}
}
}
/* This may be guessed device - floppy, cdrom or entire disk. */
if (!get_diskname_from_path (dp, device_name))
return 0;
return grub_strdup (device_name);
}
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