1 // SPDX-License-Identifier: GPL-2.0+
3 * EFI device path from u-boot device-model mapping
5 * (C) Copyright 2017 Rob Clark
13 #include <efi_loader.h>
16 /* template END node: */
17 static const struct efi_device_path END
= {
18 .type
= DEVICE_PATH_TYPE_END
,
19 .sub_type
= DEVICE_PATH_SUB_TYPE_END
,
20 .length
= sizeof(END
),
23 /* template ROOT node: */
24 static const struct efi_device_path_vendor ROOT
= {
26 .type
= DEVICE_PATH_TYPE_HARDWARE_DEVICE
,
27 .sub_type
= DEVICE_PATH_SUB_TYPE_VENDOR
,
28 .length
= sizeof(ROOT
),
33 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
35 * Determine if an MMC device is an SD card.
37 * @desc block device descriptor
38 * @return true if the device is an SD card
40 static bool is_sd(struct blk_desc
*desc
)
42 struct mmc
*mmc
= find_mmc_device(desc
->devnum
);
47 return IS_SD(mmc
) != 0U;
51 static void *dp_alloc(size_t sz
)
55 if (efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES
, sz
, &buf
) !=
57 debug("EFI: ERROR: out of memory in %s\n", __func__
);
66 * Iterate to next block in device-path, terminating (returning NULL)
69 struct efi_device_path
*efi_dp_next(const struct efi_device_path
*dp
)
73 if (dp
->type
== DEVICE_PATH_TYPE_END
)
75 dp
= ((void *)dp
) + dp
->length
;
76 if (dp
->type
== DEVICE_PATH_TYPE_END
)
78 return (struct efi_device_path
*)dp
;
82 * Compare two device-paths, stopping when the shorter of the two hits
83 * an End* node. This is useful to, for example, compare a device-path
84 * representing a device with one representing a file on the device, or
85 * a device with a parent device.
87 int efi_dp_match(const struct efi_device_path
*a
,
88 const struct efi_device_path
*b
)
93 ret
= memcmp(&a
->length
, &b
->length
, sizeof(a
->length
));
97 ret
= memcmp(a
, b
, a
->length
);
110 * We can have device paths that start with a USB WWID or a USB Class node,
111 * and a few other cases which don't encode the full device path with bus
114 * - MESSAGING:USB_WWID
115 * - MESSAGING:USB_CLASS
120 * See UEFI spec (section 3.1.2, about short-form device-paths)
122 static struct efi_device_path
*shorten_path(struct efi_device_path
*dp
)
126 * TODO: Add MESSAGING:USB_WWID and MESSAGING:URI..
127 * in practice fallback.efi just uses MEDIA:HARD_DRIVE
128 * so not sure when we would see these other cases.
130 if (EFI_DP_TYPE(dp
, MESSAGING_DEVICE
, MSG_USB_CLASS
) ||
131 EFI_DP_TYPE(dp
, MEDIA_DEVICE
, HARD_DRIVE_PATH
) ||
132 EFI_DP_TYPE(dp
, MEDIA_DEVICE
, FILE_PATH
))
135 dp
= efi_dp_next(dp
);
141 static struct efi_object
*find_obj(struct efi_device_path
*dp
, bool short_path
,
142 struct efi_device_path
**rem
)
144 struct efi_object
*efiobj
;
145 efi_uintn_t dp_size
= efi_dp_instance_size(dp
);
147 list_for_each_entry(efiobj
, &efi_obj_list
, link
) {
148 struct efi_handler
*handler
;
149 struct efi_device_path
*obj_dp
;
152 ret
= efi_search_protocol(efiobj
,
153 &efi_guid_device_path
, &handler
);
154 if (ret
!= EFI_SUCCESS
)
156 obj_dp
= handler
->protocol_interface
;
159 if (efi_dp_match(dp
, obj_dp
) == 0) {
162 * Allow partial matches, but inform
165 *rem
= ((void *)dp
) +
166 efi_dp_instance_size(obj_dp
);
169 /* Only return on exact matches */
170 if (efi_dp_instance_size(obj_dp
) ==
176 obj_dp
= shorten_path(efi_dp_next(obj_dp
));
177 } while (short_path
&& obj_dp
);
184 * Find an efiobj from device-path, if 'rem' is not NULL, returns the
185 * remaining part of the device path after the matched object.
187 struct efi_object
*efi_dp_find_obj(struct efi_device_path
*dp
,
188 struct efi_device_path
**rem
)
190 struct efi_object
*efiobj
;
192 /* Search for an exact match first */
193 efiobj
= find_obj(dp
, false, NULL
);
195 /* Then for a fuzzy match */
197 efiobj
= find_obj(dp
, false, rem
);
199 /* And now for a fuzzy short match */
201 efiobj
= find_obj(dp
, true, rem
);
207 * Determine the last device path node that is not the end node.
210 * @return last node before the end node if it exists
213 const struct efi_device_path
*efi_dp_last_node(const struct efi_device_path
*dp
)
215 struct efi_device_path
*ret
;
217 if (!dp
|| dp
->type
== DEVICE_PATH_TYPE_END
)
220 ret
= (struct efi_device_path
*)dp
;
221 dp
= efi_dp_next(dp
);
226 /* get size of the first device path instance excluding end node */
227 efi_uintn_t
efi_dp_instance_size(const struct efi_device_path
*dp
)
231 if (!dp
|| dp
->type
== DEVICE_PATH_TYPE_END
)
235 dp
= efi_dp_next(dp
);
241 /* get size of multi-instance device path excluding end node */
242 efi_uintn_t
efi_dp_size(const struct efi_device_path
*dp
)
244 const struct efi_device_path
*p
= dp
;
248 while (p
->type
!= DEVICE_PATH_TYPE_END
||
249 p
->sub_type
!= DEVICE_PATH_SUB_TYPE_END
)
250 p
= (void *)p
+ p
->length
;
252 return (void *)p
- (void *)dp
;
255 /* copy multi-instance device path */
256 struct efi_device_path
*efi_dp_dup(const struct efi_device_path
*dp
)
258 struct efi_device_path
*ndp
;
259 size_t sz
= efi_dp_size(dp
) + sizeof(END
);
272 struct efi_device_path
*efi_dp_append(const struct efi_device_path
*dp1
,
273 const struct efi_device_path
*dp2
)
275 struct efi_device_path
*ret
;
278 /* return an end node */
279 ret
= efi_dp_dup(&END
);
281 ret
= efi_dp_dup(dp2
);
283 ret
= efi_dp_dup(dp1
);
285 /* both dp1 and dp2 are non-null */
286 unsigned sz1
= efi_dp_size(dp1
);
287 unsigned sz2
= efi_dp_size(dp2
);
288 void *p
= dp_alloc(sz1
+ sz2
+ sizeof(END
));
292 /* the end node of the second device path has to be retained */
293 memcpy(p
+ sz1
, dp2
, sz2
+ sizeof(END
));
300 struct efi_device_path
*efi_dp_append_node(const struct efi_device_path
*dp
,
301 const struct efi_device_path
*node
)
303 struct efi_device_path
*ret
;
306 ret
= efi_dp_dup(&END
);
308 ret
= efi_dp_dup(dp
);
310 size_t sz
= node
->length
;
311 void *p
= dp_alloc(sz
+ sizeof(END
));
315 memcpy(p
+ sz
, &END
, sizeof(END
));
318 /* both dp and node are non-null */
319 size_t sz
= efi_dp_size(dp
);
320 void *p
= dp_alloc(sz
+ node
->length
+ sizeof(END
));
324 memcpy(p
+ sz
, node
, node
->length
);
325 memcpy(p
+ sz
+ node
->length
, &END
, sizeof(END
));
332 struct efi_device_path
*efi_dp_create_device_node(const u8 type
,
336 struct efi_device_path
*ret
;
338 ret
= dp_alloc(length
);
342 ret
->sub_type
= sub_type
;
343 ret
->length
= length
;
347 struct efi_device_path
*efi_dp_append_instance(
348 const struct efi_device_path
*dp
,
349 const struct efi_device_path
*dpi
)
352 struct efi_device_path
*p
, *ret
;
357 return efi_dp_dup(dpi
);
358 sz
= efi_dp_size(dp
);
359 szi
= efi_dp_instance_size(dpi
);
360 p
= dp_alloc(sz
+ szi
+ 2 * sizeof(END
));
364 memcpy(p
, dp
, sz
+ sizeof(END
));
366 p
->sub_type
= DEVICE_PATH_SUB_TYPE_INSTANCE_END
;
367 p
= (void *)p
+ sizeof(END
);
370 memcpy(p
, &END
, sizeof(END
));
374 struct efi_device_path
*efi_dp_get_next_instance(struct efi_device_path
**dp
,
378 struct efi_device_path
*p
;
384 sz
= efi_dp_instance_size(*dp
);
385 p
= dp_alloc(sz
+ sizeof(END
));
388 memcpy(p
, *dp
, sz
+ sizeof(END
));
389 *dp
= (void *)*dp
+ sz
;
390 if ((*dp
)->sub_type
== DEVICE_PATH_SUB_TYPE_INSTANCE_END
)
391 *dp
= (void *)*dp
+ sizeof(END
);
395 *size
= sz
+ sizeof(END
);
399 bool efi_dp_is_multi_instance(const struct efi_device_path
*dp
)
401 const struct efi_device_path
*p
= dp
;
405 while (p
->type
!= DEVICE_PATH_TYPE_END
)
406 p
= (void *)p
+ p
->length
;
407 return p
->sub_type
== DEVICE_PATH_SUB_TYPE_INSTANCE_END
;
411 /* size of device-path not including END node for device and all parents
412 * up to the root device.
414 static unsigned dp_size(struct udevice
*dev
)
416 if (!dev
|| !dev
->driver
)
419 switch (dev
->driver
->id
) {
421 case UCLASS_SIMPLE_BUS
:
422 /* stop traversing parents at this point: */
425 return dp_size(dev
->parent
) +
426 sizeof(struct efi_device_path_mac_addr
);
429 switch (dev
->parent
->uclass
->uc_drv
->id
) {
432 return dp_size(dev
->parent
) +
433 sizeof(struct efi_device_path_atapi
);
435 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
437 return dp_size(dev
->parent
) +
438 sizeof(struct efi_device_path_scsi
);
440 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
442 return dp_size(dev
->parent
) +
443 sizeof(struct efi_device_path_sd_mmc_path
);
446 return dp_size(dev
->parent
);
449 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
451 return dp_size(dev
->parent
) +
452 sizeof(struct efi_device_path_sd_mmc_path
);
454 case UCLASS_MASS_STORAGE
:
456 return dp_size(dev
->parent
) +
457 sizeof(struct efi_device_path_usb_class
);
459 /* just skip over unknown classes: */
460 return dp_size(dev
->parent
);
465 * Recursively build a device path.
467 * @buf pointer to the end of the device path
469 * @return pointer to the end of the device path
471 static void *dp_fill(void *buf
, struct udevice
*dev
)
473 if (!dev
|| !dev
->driver
)
476 switch (dev
->driver
->id
) {
478 case UCLASS_SIMPLE_BUS
: {
479 /* stop traversing parents at this point: */
480 struct efi_device_path_vendor
*vdp
= buf
;
486 struct efi_device_path_mac_addr
*dp
=
487 dp_fill(buf
, dev
->parent
);
488 struct eth_pdata
*pdata
= dev
->platdata
;
490 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
491 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR
;
492 dp
->dp
.length
= sizeof(*dp
);
493 memset(&dp
->mac
, 0, sizeof(dp
->mac
));
494 /* We only support IPv4 */
495 memcpy(&dp
->mac
, &pdata
->enetaddr
, ARP_HLEN
);
503 switch (dev
->parent
->uclass
->uc_drv
->id
) {
506 struct efi_device_path_atapi
*dp
=
507 dp_fill(buf
, dev
->parent
);
508 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
510 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
511 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_ATAPI
;
512 dp
->dp
.length
= sizeof(*dp
);
513 dp
->logical_unit_number
= desc
->devnum
;
514 dp
->primary_secondary
= IDE_BUS(desc
->devnum
);
515 dp
->slave_master
= desc
->devnum
%
516 (CONFIG_SYS_IDE_MAXDEVICE
/
517 CONFIG_SYS_IDE_MAXBUS
);
521 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
523 struct efi_device_path_scsi
*dp
=
524 dp_fill(buf
, dev
->parent
);
525 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
527 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
528 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_SCSI
;
529 dp
->dp
.length
= sizeof(*dp
);
530 dp
->logical_unit_number
= desc
->lun
;
531 dp
->target_id
= desc
->target
;
535 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
537 struct efi_device_path_sd_mmc_path
*sddp
=
538 dp_fill(buf
, dev
->parent
);
539 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
541 sddp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
542 sddp
->dp
.sub_type
= is_sd(desc
) ?
543 DEVICE_PATH_SUB_TYPE_MSG_SD
:
544 DEVICE_PATH_SUB_TYPE_MSG_MMC
;
545 sddp
->dp
.length
= sizeof(*sddp
);
546 sddp
->slot_number
= dev
->seq
;
551 debug("%s(%u) %s: unhandled parent class: %s (%u)\n",
552 __FILE__
, __LINE__
, __func__
,
553 dev
->name
, dev
->parent
->uclass
->uc_drv
->id
);
554 return dp_fill(buf
, dev
->parent
);
557 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
559 struct efi_device_path_sd_mmc_path
*sddp
=
560 dp_fill(buf
, dev
->parent
);
561 struct mmc
*mmc
= mmc_get_mmc_dev(dev
);
562 struct blk_desc
*desc
= mmc_get_blk_desc(mmc
);
564 sddp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
565 sddp
->dp
.sub_type
= is_sd(desc
) ?
566 DEVICE_PATH_SUB_TYPE_MSG_SD
:
567 DEVICE_PATH_SUB_TYPE_MSG_MMC
;
568 sddp
->dp
.length
= sizeof(*sddp
);
569 sddp
->slot_number
= dev
->seq
;
574 case UCLASS_MASS_STORAGE
:
575 case UCLASS_USB_HUB
: {
576 struct efi_device_path_usb_class
*udp
=
577 dp_fill(buf
, dev
->parent
);
578 struct usb_device
*udev
= dev_get_parent_priv(dev
);
579 struct usb_device_descriptor
*desc
= &udev
->descriptor
;
581 udp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
582 udp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS
;
583 udp
->dp
.length
= sizeof(*udp
);
584 udp
->vendor_id
= desc
->idVendor
;
585 udp
->product_id
= desc
->idProduct
;
586 udp
->device_class
= desc
->bDeviceClass
;
587 udp
->device_subclass
= desc
->bDeviceSubClass
;
588 udp
->device_protocol
= desc
->bDeviceProtocol
;
593 debug("%s(%u) %s: unhandled device class: %s (%u)\n",
594 __FILE__
, __LINE__
, __func__
,
595 dev
->name
, dev
->driver
->id
);
596 return dp_fill(buf
, dev
->parent
);
600 /* Construct a device-path from a device: */
601 struct efi_device_path
*efi_dp_from_dev(struct udevice
*dev
)
605 start
= buf
= dp_alloc(dp_size(dev
) + sizeof(END
));
608 buf
= dp_fill(buf
, dev
);
609 *((struct efi_device_path
*)buf
) = END
;
615 static unsigned dp_part_size(struct blk_desc
*desc
, int part
)
622 int ret
= blk_find_device(desc
->if_type
, desc
->devnum
, &dev
);
625 dev
= desc
->bdev
->parent
;
626 dpsize
= dp_size(dev
);
629 dpsize
= sizeof(ROOT
) + sizeof(struct efi_device_path_usb
);
632 if (part
== 0) /* the actual disk, not a partition */
635 if (desc
->part_type
== PART_TYPE_ISO
)
636 dpsize
+= sizeof(struct efi_device_path_cdrom_path
);
638 dpsize
+= sizeof(struct efi_device_path_hard_drive_path
);
644 * Create a device node for a block device partition.
646 * @buf buffer to which the device path is written
647 * @desc block device descriptor
648 * @part partition number, 0 identifies a block device
650 static void *dp_part_node(void *buf
, struct blk_desc
*desc
, int part
)
652 disk_partition_t info
;
654 part_get_info(desc
, part
, &info
);
656 if (desc
->part_type
== PART_TYPE_ISO
) {
657 struct efi_device_path_cdrom_path
*cddp
= buf
;
659 cddp
->boot_entry
= part
;
660 cddp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
661 cddp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_CDROM_PATH
;
662 cddp
->dp
.length
= sizeof(*cddp
);
663 cddp
->partition_start
= info
.start
;
664 cddp
->partition_end
= info
.size
;
668 struct efi_device_path_hard_drive_path
*hddp
= buf
;
670 hddp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
671 hddp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH
;
672 hddp
->dp
.length
= sizeof(*hddp
);
673 hddp
->partition_number
= part
;
674 hddp
->partition_start
= info
.start
;
675 hddp
->partition_end
= info
.size
;
676 if (desc
->part_type
== PART_TYPE_EFI
)
677 hddp
->partmap_type
= 2;
679 hddp
->partmap_type
= 1;
681 switch (desc
->sig_type
) {
684 hddp
->signature_type
= 0;
685 memset(hddp
->partition_signature
, 0,
686 sizeof(hddp
->partition_signature
));
689 hddp
->signature_type
= 1;
690 memset(hddp
->partition_signature
, 0,
691 sizeof(hddp
->partition_signature
));
692 memcpy(hddp
->partition_signature
, &desc
->mbr_sig
,
693 sizeof(desc
->mbr_sig
));
696 hddp
->signature_type
= 2;
697 memcpy(hddp
->partition_signature
, &desc
->guid_sig
,
698 sizeof(hddp
->partition_signature
));
709 * Create a device path for a block device or one of its partitions.
711 * @buf buffer to which the device path is written
712 * @desc block device descriptor
713 * @part partition number, 0 identifies a block device
715 static void *dp_part_fill(void *buf
, struct blk_desc
*desc
, int part
)
720 int ret
= blk_find_device(desc
->if_type
, desc
->devnum
, &dev
);
723 dev
= desc
->bdev
->parent
;
724 buf
= dp_fill(buf
, dev
);
728 * We *could* make a more accurate path, by looking at if_type
729 * and handling all the different cases like we do for non-
730 * legacy (i.e. CONFIG_BLK=y) case. But most important thing
731 * is just to have a unique device-path for if_type+devnum.
732 * So map things to a fictitious USB device.
734 struct efi_device_path_usb
*udp
;
736 memcpy(buf
, &ROOT
, sizeof(ROOT
));
740 udp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
741 udp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_USB
;
742 udp
->dp
.length
= sizeof(*udp
);
743 udp
->parent_port_number
= desc
->if_type
;
744 udp
->usb_interface
= desc
->devnum
;
748 if (part
== 0) /* the actual disk, not a partition */
751 return dp_part_node(buf
, desc
, part
);
754 /* Construct a device-path from a partition on a block device: */
755 struct efi_device_path
*efi_dp_from_part(struct blk_desc
*desc
, int part
)
759 start
= buf
= dp_alloc(dp_part_size(desc
, part
) + sizeof(END
));
763 buf
= dp_part_fill(buf
, desc
, part
);
765 *((struct efi_device_path
*)buf
) = END
;
771 * Create a device node for a block device partition.
773 * @buf buffer to which the device path is written
774 * @desc block device descriptor
775 * @part partition number, 0 identifies a block device
777 struct efi_device_path
*efi_dp_part_node(struct blk_desc
*desc
, int part
)
782 if (desc
->part_type
== PART_TYPE_ISO
)
783 dpsize
= sizeof(struct efi_device_path_cdrom_path
);
785 dpsize
= sizeof(struct efi_device_path_hard_drive_path
);
786 buf
= dp_alloc(dpsize
);
788 dp_part_node(buf
, desc
, part
);
793 /* convert path to an UEFI style path (i.e. DOS style backslashes and UTF-16) */
794 static void path_to_uefi(u16
*uefi
, const char *path
)
806 * If desc is NULL, this creates a path with only the file component,
807 * otherwise it creates a full path with both device and file components
809 struct efi_device_path
*efi_dp_from_file(struct blk_desc
*desc
, int part
,
812 struct efi_device_path_file_path
*fp
;
814 unsigned dpsize
= 0, fpsize
;
817 dpsize
= dp_part_size(desc
, part
);
819 fpsize
= sizeof(struct efi_device_path
) + 2 * (strlen(path
) + 1);
822 start
= buf
= dp_alloc(dpsize
+ sizeof(END
));
827 buf
= dp_part_fill(buf
, desc
, part
);
831 fp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
832 fp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
;
833 fp
->dp
.length
= fpsize
;
834 path_to_uefi(fp
->str
, path
);
837 *((struct efi_device_path
*)buf
) = END
;
843 struct efi_device_path
*efi_dp_from_eth(void)
845 #ifndef CONFIG_DM_ETH
846 struct efi_device_path_mac_addr
*ndp
;
851 assert(eth_get_dev());
854 dpsize
+= dp_size(eth_get_dev());
856 dpsize
+= sizeof(ROOT
);
857 dpsize
+= sizeof(*ndp
);
860 start
= buf
= dp_alloc(dpsize
+ sizeof(END
));
865 buf
= dp_fill(buf
, eth_get_dev());
867 memcpy(buf
, &ROOT
, sizeof(ROOT
));
871 ndp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
872 ndp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR
;
873 ndp
->dp
.length
= sizeof(*ndp
);
874 ndp
->if_type
= 1; /* Ethernet */
875 memcpy(ndp
->mac
.addr
, eth_get_ethaddr(), ARP_HLEN
);
879 *((struct efi_device_path
*)buf
) = END
;
885 /* Construct a device-path for memory-mapped image */
886 struct efi_device_path
*efi_dp_from_mem(uint32_t memory_type
,
887 uint64_t start_address
,
888 uint64_t end_address
)
890 struct efi_device_path_memory
*mdp
;
893 start
= buf
= dp_alloc(sizeof(*mdp
) + sizeof(END
));
898 mdp
->dp
.type
= DEVICE_PATH_TYPE_HARDWARE_DEVICE
;
899 mdp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MEMORY
;
900 mdp
->dp
.length
= sizeof(*mdp
);
901 mdp
->memory_type
= memory_type
;
902 mdp
->start_address
= start_address
;
903 mdp
->end_address
= end_address
;
906 *((struct efi_device_path
*)buf
) = END
;
912 * efi_dp_split_file_path() - split of relative file path from device path
914 * Given a device path indicating a file on a device, separate the device
915 * path in two: the device path of the actual device and the file path
916 * relative to this device.
918 * @full_path: device path including device and file path
919 * @device_path: path of the device
920 * @file_path: relative path of the file
921 * Return: status code
923 efi_status_t
efi_dp_split_file_path(struct efi_device_path
*full_path
,
924 struct efi_device_path
**device_path
,
925 struct efi_device_path
**file_path
)
927 struct efi_device_path
*p
, *dp
, *fp
;
931 dp
= efi_dp_dup(full_path
);
933 return EFI_OUT_OF_RESOURCES
;
935 while (!EFI_DP_TYPE(p
, MEDIA_DEVICE
, FILE_PATH
)) {
938 return EFI_INVALID_PARAMETER
;
942 return EFI_OUT_OF_RESOURCES
;
943 p
->type
= DEVICE_PATH_TYPE_END
;
944 p
->sub_type
= DEVICE_PATH_SUB_TYPE_END
;
945 p
->length
= sizeof(*p
);
952 efi_status_t
efi_dp_from_name(const char *dev
, const char *devnr
,
954 struct efi_device_path
**device
,
955 struct efi_device_path
**file
)
958 struct blk_desc
*desc
= NULL
;
959 disk_partition_t fs_partition
;
961 char filename
[32] = { 0 }; /* dp->str is u16[32] long */
965 return EFI_INVALID_PARAMETER
;
967 is_net
= !strcmp(dev
, "Net");
969 part
= blk_get_device_part_str(dev
, devnr
, &desc
, &fs_partition
,
971 if (part
< 0 || !desc
)
972 return EFI_INVALID_PARAMETER
;
975 *device
= efi_dp_from_part(desc
, part
);
979 *device
= efi_dp_from_eth();
986 snprintf(filename
, sizeof(filename
), "%s", path
);
987 /* DOS style file path: */
989 while ((s
= strchr(s
, '/')))
991 *file
= efi_dp_from_file(((!is_net
&& device
) ? desc
: NULL
),