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 if (length
< sizeof(struct efi_device_path
))
341 ret
= dp_alloc(length
);
345 ret
->sub_type
= sub_type
;
346 ret
->length
= length
;
350 struct efi_device_path
*efi_dp_append_instance(
351 const struct efi_device_path
*dp
,
352 const struct efi_device_path
*dpi
)
355 struct efi_device_path
*p
, *ret
;
360 return efi_dp_dup(dpi
);
361 sz
= efi_dp_size(dp
);
362 szi
= efi_dp_instance_size(dpi
);
363 p
= dp_alloc(sz
+ szi
+ 2 * sizeof(END
));
367 memcpy(p
, dp
, sz
+ sizeof(END
));
369 p
->sub_type
= DEVICE_PATH_SUB_TYPE_INSTANCE_END
;
370 p
= (void *)p
+ sizeof(END
);
373 memcpy(p
, &END
, sizeof(END
));
377 struct efi_device_path
*efi_dp_get_next_instance(struct efi_device_path
**dp
,
381 struct efi_device_path
*p
;
387 sz
= efi_dp_instance_size(*dp
);
388 p
= dp_alloc(sz
+ sizeof(END
));
391 memcpy(p
, *dp
, sz
+ sizeof(END
));
392 *dp
= (void *)*dp
+ sz
;
393 if ((*dp
)->sub_type
== DEVICE_PATH_SUB_TYPE_INSTANCE_END
)
394 *dp
= (void *)*dp
+ sizeof(END
);
398 *size
= sz
+ sizeof(END
);
402 bool efi_dp_is_multi_instance(const struct efi_device_path
*dp
)
404 const struct efi_device_path
*p
= dp
;
408 while (p
->type
!= DEVICE_PATH_TYPE_END
)
409 p
= (void *)p
+ p
->length
;
410 return p
->sub_type
== DEVICE_PATH_SUB_TYPE_INSTANCE_END
;
414 /* size of device-path not including END node for device and all parents
415 * up to the root device.
417 static unsigned dp_size(struct udevice
*dev
)
419 if (!dev
|| !dev
->driver
)
422 switch (dev
->driver
->id
) {
424 case UCLASS_SIMPLE_BUS
:
425 /* stop traversing parents at this point: */
428 return dp_size(dev
->parent
) +
429 sizeof(struct efi_device_path_mac_addr
);
432 switch (dev
->parent
->uclass
->uc_drv
->id
) {
435 return dp_size(dev
->parent
) +
436 sizeof(struct efi_device_path_atapi
);
438 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
440 return dp_size(dev
->parent
) +
441 sizeof(struct efi_device_path_scsi
);
443 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
445 return dp_size(dev
->parent
) +
446 sizeof(struct efi_device_path_sd_mmc_path
);
449 return dp_size(dev
->parent
);
452 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
454 return dp_size(dev
->parent
) +
455 sizeof(struct efi_device_path_sd_mmc_path
);
457 case UCLASS_MASS_STORAGE
:
459 return dp_size(dev
->parent
) +
460 sizeof(struct efi_device_path_usb_class
);
462 /* just skip over unknown classes: */
463 return dp_size(dev
->parent
);
468 * Recursively build a device path.
470 * @buf pointer to the end of the device path
472 * @return pointer to the end of the device path
474 static void *dp_fill(void *buf
, struct udevice
*dev
)
476 if (!dev
|| !dev
->driver
)
479 switch (dev
->driver
->id
) {
481 case UCLASS_SIMPLE_BUS
: {
482 /* stop traversing parents at this point: */
483 struct efi_device_path_vendor
*vdp
= buf
;
489 struct efi_device_path_mac_addr
*dp
=
490 dp_fill(buf
, dev
->parent
);
491 struct eth_pdata
*pdata
= dev
->platdata
;
493 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
494 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR
;
495 dp
->dp
.length
= sizeof(*dp
);
496 memset(&dp
->mac
, 0, sizeof(dp
->mac
));
497 /* We only support IPv4 */
498 memcpy(&dp
->mac
, &pdata
->enetaddr
, ARP_HLEN
);
506 switch (dev
->parent
->uclass
->uc_drv
->id
) {
509 struct efi_device_path_atapi
*dp
=
510 dp_fill(buf
, dev
->parent
);
511 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
513 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
514 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_ATAPI
;
515 dp
->dp
.length
= sizeof(*dp
);
516 dp
->logical_unit_number
= desc
->devnum
;
517 dp
->primary_secondary
= IDE_BUS(desc
->devnum
);
518 dp
->slave_master
= desc
->devnum
%
519 (CONFIG_SYS_IDE_MAXDEVICE
/
520 CONFIG_SYS_IDE_MAXBUS
);
524 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
526 struct efi_device_path_scsi
*dp
=
527 dp_fill(buf
, dev
->parent
);
528 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
530 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
531 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_SCSI
;
532 dp
->dp
.length
= sizeof(*dp
);
533 dp
->logical_unit_number
= desc
->lun
;
534 dp
->target_id
= desc
->target
;
538 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
540 struct efi_device_path_sd_mmc_path
*sddp
=
541 dp_fill(buf
, dev
->parent
);
542 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
544 sddp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
545 sddp
->dp
.sub_type
= is_sd(desc
) ?
546 DEVICE_PATH_SUB_TYPE_MSG_SD
:
547 DEVICE_PATH_SUB_TYPE_MSG_MMC
;
548 sddp
->dp
.length
= sizeof(*sddp
);
549 sddp
->slot_number
= dev
->seq
;
554 debug("%s(%u) %s: unhandled parent class: %s (%u)\n",
555 __FILE__
, __LINE__
, __func__
,
556 dev
->name
, dev
->parent
->uclass
->uc_drv
->id
);
557 return dp_fill(buf
, dev
->parent
);
560 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
562 struct efi_device_path_sd_mmc_path
*sddp
=
563 dp_fill(buf
, dev
->parent
);
564 struct mmc
*mmc
= mmc_get_mmc_dev(dev
);
565 struct blk_desc
*desc
= mmc_get_blk_desc(mmc
);
567 sddp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
568 sddp
->dp
.sub_type
= is_sd(desc
) ?
569 DEVICE_PATH_SUB_TYPE_MSG_SD
:
570 DEVICE_PATH_SUB_TYPE_MSG_MMC
;
571 sddp
->dp
.length
= sizeof(*sddp
);
572 sddp
->slot_number
= dev
->seq
;
577 case UCLASS_MASS_STORAGE
:
578 case UCLASS_USB_HUB
: {
579 struct efi_device_path_usb_class
*udp
=
580 dp_fill(buf
, dev
->parent
);
581 struct usb_device
*udev
= dev_get_parent_priv(dev
);
582 struct usb_device_descriptor
*desc
= &udev
->descriptor
;
584 udp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
585 udp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS
;
586 udp
->dp
.length
= sizeof(*udp
);
587 udp
->vendor_id
= desc
->idVendor
;
588 udp
->product_id
= desc
->idProduct
;
589 udp
->device_class
= desc
->bDeviceClass
;
590 udp
->device_subclass
= desc
->bDeviceSubClass
;
591 udp
->device_protocol
= desc
->bDeviceProtocol
;
596 debug("%s(%u) %s: unhandled device class: %s (%u)\n",
597 __FILE__
, __LINE__
, __func__
,
598 dev
->name
, dev
->driver
->id
);
599 return dp_fill(buf
, dev
->parent
);
603 /* Construct a device-path from a device: */
604 struct efi_device_path
*efi_dp_from_dev(struct udevice
*dev
)
608 start
= buf
= dp_alloc(dp_size(dev
) + sizeof(END
));
611 buf
= dp_fill(buf
, dev
);
612 *((struct efi_device_path
*)buf
) = END
;
618 static unsigned dp_part_size(struct blk_desc
*desc
, int part
)
625 int ret
= blk_find_device(desc
->if_type
, desc
->devnum
, &dev
);
628 dev
= desc
->bdev
->parent
;
629 dpsize
= dp_size(dev
);
632 dpsize
= sizeof(ROOT
) + sizeof(struct efi_device_path_usb
);
635 if (part
== 0) /* the actual disk, not a partition */
638 if (desc
->part_type
== PART_TYPE_ISO
)
639 dpsize
+= sizeof(struct efi_device_path_cdrom_path
);
641 dpsize
+= sizeof(struct efi_device_path_hard_drive_path
);
647 * Create a device node for a block device partition.
649 * @buf buffer to which the device path is written
650 * @desc block device descriptor
651 * @part partition number, 0 identifies a block device
653 static void *dp_part_node(void *buf
, struct blk_desc
*desc
, int part
)
655 disk_partition_t info
;
657 part_get_info(desc
, part
, &info
);
659 if (desc
->part_type
== PART_TYPE_ISO
) {
660 struct efi_device_path_cdrom_path
*cddp
= buf
;
662 cddp
->boot_entry
= part
;
663 cddp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
664 cddp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_CDROM_PATH
;
665 cddp
->dp
.length
= sizeof(*cddp
);
666 cddp
->partition_start
= info
.start
;
667 cddp
->partition_end
= info
.size
;
671 struct efi_device_path_hard_drive_path
*hddp
= buf
;
673 hddp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
674 hddp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH
;
675 hddp
->dp
.length
= sizeof(*hddp
);
676 hddp
->partition_number
= part
;
677 hddp
->partition_start
= info
.start
;
678 hddp
->partition_end
= info
.size
;
679 if (desc
->part_type
== PART_TYPE_EFI
)
680 hddp
->partmap_type
= 2;
682 hddp
->partmap_type
= 1;
684 switch (desc
->sig_type
) {
687 hddp
->signature_type
= 0;
688 memset(hddp
->partition_signature
, 0,
689 sizeof(hddp
->partition_signature
));
692 hddp
->signature_type
= 1;
693 memset(hddp
->partition_signature
, 0,
694 sizeof(hddp
->partition_signature
));
695 memcpy(hddp
->partition_signature
, &desc
->mbr_sig
,
696 sizeof(desc
->mbr_sig
));
699 hddp
->signature_type
= 2;
700 memcpy(hddp
->partition_signature
, &desc
->guid_sig
,
701 sizeof(hddp
->partition_signature
));
712 * Create a device path for a block device or one of its partitions.
714 * @buf buffer to which the device path is written
715 * @desc block device descriptor
716 * @part partition number, 0 identifies a block device
718 static void *dp_part_fill(void *buf
, struct blk_desc
*desc
, int part
)
723 int ret
= blk_find_device(desc
->if_type
, desc
->devnum
, &dev
);
726 dev
= desc
->bdev
->parent
;
727 buf
= dp_fill(buf
, dev
);
731 * We *could* make a more accurate path, by looking at if_type
732 * and handling all the different cases like we do for non-
733 * legacy (i.e. CONFIG_BLK=y) case. But most important thing
734 * is just to have a unique device-path for if_type+devnum.
735 * So map things to a fictitious USB device.
737 struct efi_device_path_usb
*udp
;
739 memcpy(buf
, &ROOT
, sizeof(ROOT
));
743 udp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
744 udp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_USB
;
745 udp
->dp
.length
= sizeof(*udp
);
746 udp
->parent_port_number
= desc
->if_type
;
747 udp
->usb_interface
= desc
->devnum
;
751 if (part
== 0) /* the actual disk, not a partition */
754 return dp_part_node(buf
, desc
, part
);
757 /* Construct a device-path from a partition on a block device: */
758 struct efi_device_path
*efi_dp_from_part(struct blk_desc
*desc
, int part
)
762 start
= buf
= dp_alloc(dp_part_size(desc
, part
) + sizeof(END
));
766 buf
= dp_part_fill(buf
, desc
, part
);
768 *((struct efi_device_path
*)buf
) = END
;
774 * Create a device node for a block device partition.
776 * @buf buffer to which the device path is written
777 * @desc block device descriptor
778 * @part partition number, 0 identifies a block device
780 struct efi_device_path
*efi_dp_part_node(struct blk_desc
*desc
, int part
)
785 if (desc
->part_type
== PART_TYPE_ISO
)
786 dpsize
= sizeof(struct efi_device_path_cdrom_path
);
788 dpsize
= sizeof(struct efi_device_path_hard_drive_path
);
789 buf
= dp_alloc(dpsize
);
791 dp_part_node(buf
, desc
, part
);
796 /* convert path to an UEFI style path (i.e. DOS style backslashes and UTF-16) */
797 static void path_to_uefi(u16
*uefi
, const char *path
)
809 * If desc is NULL, this creates a path with only the file component,
810 * otherwise it creates a full path with both device and file components
812 struct efi_device_path
*efi_dp_from_file(struct blk_desc
*desc
, int part
,
815 struct efi_device_path_file_path
*fp
;
817 unsigned dpsize
= 0, fpsize
;
820 dpsize
= dp_part_size(desc
, part
);
822 fpsize
= sizeof(struct efi_device_path
) + 2 * (strlen(path
) + 1);
825 start
= buf
= dp_alloc(dpsize
+ sizeof(END
));
830 buf
= dp_part_fill(buf
, desc
, part
);
834 fp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
835 fp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
;
836 fp
->dp
.length
= fpsize
;
837 path_to_uefi(fp
->str
, path
);
840 *((struct efi_device_path
*)buf
) = END
;
846 struct efi_device_path
*efi_dp_from_eth(void)
848 #ifndef CONFIG_DM_ETH
849 struct efi_device_path_mac_addr
*ndp
;
854 assert(eth_get_dev());
857 dpsize
+= dp_size(eth_get_dev());
859 dpsize
+= sizeof(ROOT
);
860 dpsize
+= sizeof(*ndp
);
863 start
= buf
= dp_alloc(dpsize
+ sizeof(END
));
868 buf
= dp_fill(buf
, eth_get_dev());
870 memcpy(buf
, &ROOT
, sizeof(ROOT
));
874 ndp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
875 ndp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR
;
876 ndp
->dp
.length
= sizeof(*ndp
);
877 ndp
->if_type
= 1; /* Ethernet */
878 memcpy(ndp
->mac
.addr
, eth_get_ethaddr(), ARP_HLEN
);
882 *((struct efi_device_path
*)buf
) = END
;
888 /* Construct a device-path for memory-mapped image */
889 struct efi_device_path
*efi_dp_from_mem(uint32_t memory_type
,
890 uint64_t start_address
,
891 uint64_t end_address
)
893 struct efi_device_path_memory
*mdp
;
896 start
= buf
= dp_alloc(sizeof(*mdp
) + sizeof(END
));
901 mdp
->dp
.type
= DEVICE_PATH_TYPE_HARDWARE_DEVICE
;
902 mdp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MEMORY
;
903 mdp
->dp
.length
= sizeof(*mdp
);
904 mdp
->memory_type
= memory_type
;
905 mdp
->start_address
= start_address
;
906 mdp
->end_address
= end_address
;
909 *((struct efi_device_path
*)buf
) = END
;
915 * efi_dp_split_file_path() - split of relative file path from device path
917 * Given a device path indicating a file on a device, separate the device
918 * path in two: the device path of the actual device and the file path
919 * relative to this device.
921 * @full_path: device path including device and file path
922 * @device_path: path of the device
923 * @file_path: relative path of the file or NULL if there is none
924 * Return: status code
926 efi_status_t
efi_dp_split_file_path(struct efi_device_path
*full_path
,
927 struct efi_device_path
**device_path
,
928 struct efi_device_path
**file_path
)
930 struct efi_device_path
*p
, *dp
, *fp
= NULL
;
934 dp
= efi_dp_dup(full_path
);
936 return EFI_OUT_OF_RESOURCES
;
938 while (!EFI_DP_TYPE(p
, MEDIA_DEVICE
, FILE_PATH
)) {
945 return EFI_OUT_OF_RESOURCES
;
946 p
->type
= DEVICE_PATH_TYPE_END
;
947 p
->sub_type
= DEVICE_PATH_SUB_TYPE_END
;
948 p
->length
= sizeof(*p
);
956 efi_status_t
efi_dp_from_name(const char *dev
, const char *devnr
,
958 struct efi_device_path
**device
,
959 struct efi_device_path
**file
)
962 struct blk_desc
*desc
= NULL
;
963 disk_partition_t fs_partition
;
965 char filename
[32] = { 0 }; /* dp->str is u16[32] long */
969 return EFI_INVALID_PARAMETER
;
971 is_net
= !strcmp(dev
, "Net");
973 part
= blk_get_device_part_str(dev
, devnr
, &desc
, &fs_partition
,
975 if (part
< 0 || !desc
)
976 return EFI_INVALID_PARAMETER
;
979 *device
= efi_dp_from_part(desc
, part
);
983 *device
= efi_dp_from_eth();
990 snprintf(filename
, sizeof(filename
), "%s", path
);
991 /* DOS style file path: */
993 while ((s
= strchr(s
, '/')))
995 *file
= efi_dp_from_file(((!is_net
&& device
) ? desc
: NULL
),