1 // SPDX-License-Identifier: GPL-2.0+
3 * EFI device path from u-boot device-model mapping
5 * (C) Copyright 2017 Rob Clark
8 #define LOG_CATEGORY LOGL_ERR
15 #include <efi_loader.h>
18 /* template END node: */
19 static const struct efi_device_path END
= {
20 .type
= DEVICE_PATH_TYPE_END
,
21 .sub_type
= DEVICE_PATH_SUB_TYPE_END
,
22 .length
= sizeof(END
),
25 /* template ROOT node: */
26 static const struct efi_device_path_vendor ROOT
= {
28 .type
= DEVICE_PATH_TYPE_HARDWARE_DEVICE
,
29 .sub_type
= DEVICE_PATH_SUB_TYPE_VENDOR
,
30 .length
= sizeof(ROOT
),
35 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
37 * Determine if an MMC device is an SD card.
39 * @desc block device descriptor
40 * @return true if the device is an SD card
42 static bool is_sd(struct blk_desc
*desc
)
44 struct mmc
*mmc
= find_mmc_device(desc
->devnum
);
49 return IS_SD(mmc
) != 0U;
53 static void *dp_alloc(size_t sz
)
57 if (efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES
, sz
, &buf
) !=
59 debug("EFI: ERROR: out of memory in %s\n", __func__
);
68 * Iterate to next block in device-path, terminating (returning NULL)
71 struct efi_device_path
*efi_dp_next(const struct efi_device_path
*dp
)
75 if (dp
->type
== DEVICE_PATH_TYPE_END
)
77 dp
= ((void *)dp
) + dp
->length
;
78 if (dp
->type
== DEVICE_PATH_TYPE_END
)
80 return (struct efi_device_path
*)dp
;
84 * Compare two device-paths, stopping when the shorter of the two hits
85 * an End* node. This is useful to, for example, compare a device-path
86 * representing a device with one representing a file on the device, or
87 * a device with a parent device.
89 int efi_dp_match(const struct efi_device_path
*a
,
90 const struct efi_device_path
*b
)
95 ret
= memcmp(&a
->length
, &b
->length
, sizeof(a
->length
));
99 ret
= memcmp(a
, b
, a
->length
);
112 * We can have device paths that start with a USB WWID or a USB Class node,
113 * and a few other cases which don't encode the full device path with bus
116 * - MESSAGING:USB_WWID
117 * - MESSAGING:USB_CLASS
122 * See UEFI spec (section 3.1.2, about short-form device-paths)
124 static struct efi_device_path
*shorten_path(struct efi_device_path
*dp
)
128 * TODO: Add MESSAGING:USB_WWID and MESSAGING:URI..
129 * in practice fallback.efi just uses MEDIA:HARD_DRIVE
130 * so not sure when we would see these other cases.
132 if (EFI_DP_TYPE(dp
, MESSAGING_DEVICE
, MSG_USB_CLASS
) ||
133 EFI_DP_TYPE(dp
, MEDIA_DEVICE
, HARD_DRIVE_PATH
) ||
134 EFI_DP_TYPE(dp
, MEDIA_DEVICE
, FILE_PATH
))
137 dp
= efi_dp_next(dp
);
143 static struct efi_object
*find_obj(struct efi_device_path
*dp
, bool short_path
,
144 struct efi_device_path
**rem
)
146 struct efi_object
*efiobj
;
147 efi_uintn_t dp_size
= efi_dp_instance_size(dp
);
149 list_for_each_entry(efiobj
, &efi_obj_list
, link
) {
150 struct efi_handler
*handler
;
151 struct efi_device_path
*obj_dp
;
154 ret
= efi_search_protocol(efiobj
,
155 &efi_guid_device_path
, &handler
);
156 if (ret
!= EFI_SUCCESS
)
158 obj_dp
= handler
->protocol_interface
;
161 if (efi_dp_match(dp
, obj_dp
) == 0) {
164 * Allow partial matches, but inform
167 *rem
= ((void *)dp
) +
168 efi_dp_instance_size(obj_dp
);
171 /* Only return on exact matches */
172 if (efi_dp_instance_size(obj_dp
) ==
178 obj_dp
= shorten_path(efi_dp_next(obj_dp
));
179 } while (short_path
&& obj_dp
);
186 * Find an efiobj from device-path, if 'rem' is not NULL, returns the
187 * remaining part of the device path after the matched object.
189 struct efi_object
*efi_dp_find_obj(struct efi_device_path
*dp
,
190 struct efi_device_path
**rem
)
192 struct efi_object
*efiobj
;
194 /* Search for an exact match first */
195 efiobj
= find_obj(dp
, false, NULL
);
197 /* Then for a fuzzy match */
199 efiobj
= find_obj(dp
, false, rem
);
201 /* And now for a fuzzy short match */
203 efiobj
= find_obj(dp
, true, rem
);
209 * Determine the last device path node that is not the end node.
212 * @return last node before the end node if it exists
215 const struct efi_device_path
*efi_dp_last_node(const struct efi_device_path
*dp
)
217 struct efi_device_path
*ret
;
219 if (!dp
|| dp
->type
== DEVICE_PATH_TYPE_END
)
222 ret
= (struct efi_device_path
*)dp
;
223 dp
= efi_dp_next(dp
);
228 /* get size of the first device path instance excluding end node */
229 efi_uintn_t
efi_dp_instance_size(const struct efi_device_path
*dp
)
233 if (!dp
|| dp
->type
== DEVICE_PATH_TYPE_END
)
237 dp
= efi_dp_next(dp
);
243 /* get size of multi-instance device path excluding end node */
244 efi_uintn_t
efi_dp_size(const struct efi_device_path
*dp
)
246 const struct efi_device_path
*p
= dp
;
250 while (p
->type
!= DEVICE_PATH_TYPE_END
||
251 p
->sub_type
!= DEVICE_PATH_SUB_TYPE_END
)
252 p
= (void *)p
+ p
->length
;
254 return (void *)p
- (void *)dp
;
257 /* copy multi-instance device path */
258 struct efi_device_path
*efi_dp_dup(const struct efi_device_path
*dp
)
260 struct efi_device_path
*ndp
;
261 size_t sz
= efi_dp_size(dp
) + sizeof(END
);
274 struct efi_device_path
*efi_dp_append(const struct efi_device_path
*dp1
,
275 const struct efi_device_path
*dp2
)
277 struct efi_device_path
*ret
;
280 /* return an end node */
281 ret
= efi_dp_dup(&END
);
283 ret
= efi_dp_dup(dp2
);
285 ret
= efi_dp_dup(dp1
);
287 /* both dp1 and dp2 are non-null */
288 unsigned sz1
= efi_dp_size(dp1
);
289 unsigned sz2
= efi_dp_size(dp2
);
290 void *p
= dp_alloc(sz1
+ sz2
+ sizeof(END
));
294 /* the end node of the second device path has to be retained */
295 memcpy(p
+ sz1
, dp2
, sz2
+ sizeof(END
));
302 struct efi_device_path
*efi_dp_append_node(const struct efi_device_path
*dp
,
303 const struct efi_device_path
*node
)
305 struct efi_device_path
*ret
;
308 ret
= efi_dp_dup(&END
);
310 ret
= efi_dp_dup(dp
);
312 size_t sz
= node
->length
;
313 void *p
= dp_alloc(sz
+ sizeof(END
));
317 memcpy(p
+ sz
, &END
, sizeof(END
));
320 /* both dp and node are non-null */
321 size_t sz
= efi_dp_size(dp
);
322 void *p
= dp_alloc(sz
+ node
->length
+ sizeof(END
));
326 memcpy(p
+ sz
, node
, node
->length
);
327 memcpy(p
+ sz
+ node
->length
, &END
, sizeof(END
));
334 struct efi_device_path
*efi_dp_create_device_node(const u8 type
,
338 struct efi_device_path
*ret
;
340 ret
= dp_alloc(length
);
344 ret
->sub_type
= sub_type
;
345 ret
->length
= length
;
349 struct efi_device_path
*efi_dp_append_instance(
350 const struct efi_device_path
*dp
,
351 const struct efi_device_path
*dpi
)
354 struct efi_device_path
*p
, *ret
;
359 return efi_dp_dup(dpi
);
360 sz
= efi_dp_size(dp
);
361 szi
= efi_dp_instance_size(dpi
);
362 p
= dp_alloc(sz
+ szi
+ 2 * sizeof(END
));
366 memcpy(p
, dp
, sz
+ sizeof(END
));
368 p
->sub_type
= DEVICE_PATH_SUB_TYPE_INSTANCE_END
;
369 p
= (void *)p
+ sizeof(END
);
372 memcpy(p
, &END
, sizeof(END
));
376 struct efi_device_path
*efi_dp_get_next_instance(struct efi_device_path
**dp
,
380 struct efi_device_path
*p
;
386 sz
= efi_dp_instance_size(*dp
);
387 p
= dp_alloc(sz
+ sizeof(END
));
390 memcpy(p
, *dp
, sz
+ sizeof(END
));
391 *dp
= (void *)*dp
+ sz
;
392 if ((*dp
)->sub_type
== DEVICE_PATH_SUB_TYPE_INSTANCE_END
)
393 *dp
= (void *)*dp
+ sizeof(END
);
397 *size
= sz
+ sizeof(END
);
401 bool efi_dp_is_multi_instance(const struct efi_device_path
*dp
)
403 const struct efi_device_path
*p
= dp
;
407 while (p
->type
!= DEVICE_PATH_TYPE_END
)
408 p
= (void *)p
+ p
->length
;
409 return p
->sub_type
== DEVICE_PATH_SUB_TYPE_INSTANCE_END
;
413 /* size of device-path not including END node for device and all parents
414 * up to the root device.
416 static unsigned dp_size(struct udevice
*dev
)
418 if (!dev
|| !dev
->driver
)
421 switch (dev
->driver
->id
) {
423 case UCLASS_SIMPLE_BUS
:
424 /* stop traversing parents at this point: */
427 return dp_size(dev
->parent
) +
428 sizeof(struct efi_device_path_mac_addr
);
431 switch (dev
->parent
->uclass
->uc_drv
->id
) {
434 return dp_size(dev
->parent
) +
435 sizeof(struct efi_device_path_atapi
);
437 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
439 return dp_size(dev
->parent
) +
440 sizeof(struct efi_device_path_scsi
);
442 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
444 return dp_size(dev
->parent
) +
445 sizeof(struct efi_device_path_sd_mmc_path
);
448 return dp_size(dev
->parent
);
451 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
453 return dp_size(dev
->parent
) +
454 sizeof(struct efi_device_path_sd_mmc_path
);
456 case UCLASS_MASS_STORAGE
:
458 return dp_size(dev
->parent
) +
459 sizeof(struct efi_device_path_usb_class
);
461 /* just skip over unknown classes: */
462 return dp_size(dev
->parent
);
467 * Recursively build a device path.
469 * @buf pointer to the end of the device path
471 * @return pointer to the end of the device path
473 static void *dp_fill(void *buf
, struct udevice
*dev
)
475 if (!dev
|| !dev
->driver
)
478 switch (dev
->driver
->id
) {
480 case UCLASS_SIMPLE_BUS
: {
481 /* stop traversing parents at this point: */
482 struct efi_device_path_vendor
*vdp
= buf
;
488 struct efi_device_path_mac_addr
*dp
=
489 dp_fill(buf
, dev
->parent
);
490 struct eth_pdata
*pdata
= dev
->platdata
;
492 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
493 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR
;
494 dp
->dp
.length
= sizeof(*dp
);
495 memset(&dp
->mac
, 0, sizeof(dp
->mac
));
496 /* We only support IPv4 */
497 memcpy(&dp
->mac
, &pdata
->enetaddr
, ARP_HLEN
);
505 switch (dev
->parent
->uclass
->uc_drv
->id
) {
508 struct efi_device_path_atapi
*dp
=
509 dp_fill(buf
, dev
->parent
);
510 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
512 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
513 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_ATAPI
;
514 dp
->dp
.length
= sizeof(*dp
);
515 dp
->logical_unit_number
= desc
->devnum
;
516 dp
->primary_secondary
= IDE_BUS(desc
->devnum
);
517 dp
->slave_master
= desc
->devnum
%
518 (CONFIG_SYS_IDE_MAXDEVICE
/
519 CONFIG_SYS_IDE_MAXBUS
);
523 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
525 struct efi_device_path_scsi
*dp
=
526 dp_fill(buf
, dev
->parent
);
527 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
529 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
530 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_SCSI
;
531 dp
->dp
.length
= sizeof(*dp
);
532 dp
->logical_unit_number
= desc
->lun
;
533 dp
->target_id
= desc
->target
;
537 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
539 struct efi_device_path_sd_mmc_path
*sddp
=
540 dp_fill(buf
, dev
->parent
);
541 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
543 sddp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
544 sddp
->dp
.sub_type
= is_sd(desc
) ?
545 DEVICE_PATH_SUB_TYPE_MSG_SD
:
546 DEVICE_PATH_SUB_TYPE_MSG_MMC
;
547 sddp
->dp
.length
= sizeof(*sddp
);
548 sddp
->slot_number
= dev
->seq
;
553 debug("%s(%u) %s: unhandled parent class: %s (%u)\n",
554 __FILE__
, __LINE__
, __func__
,
555 dev
->name
, dev
->parent
->uclass
->uc_drv
->id
);
556 return dp_fill(buf
, dev
->parent
);
559 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
561 struct efi_device_path_sd_mmc_path
*sddp
=
562 dp_fill(buf
, dev
->parent
);
563 struct mmc
*mmc
= mmc_get_mmc_dev(dev
);
564 struct blk_desc
*desc
= mmc_get_blk_desc(mmc
);
566 sddp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
567 sddp
->dp
.sub_type
= is_sd(desc
) ?
568 DEVICE_PATH_SUB_TYPE_MSG_SD
:
569 DEVICE_PATH_SUB_TYPE_MSG_MMC
;
570 sddp
->dp
.length
= sizeof(*sddp
);
571 sddp
->slot_number
= dev
->seq
;
576 case UCLASS_MASS_STORAGE
:
577 case UCLASS_USB_HUB
: {
578 struct efi_device_path_usb_class
*udp
=
579 dp_fill(buf
, dev
->parent
);
580 struct usb_device
*udev
= dev_get_parent_priv(dev
);
581 struct usb_device_descriptor
*desc
= &udev
->descriptor
;
583 udp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
584 udp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS
;
585 udp
->dp
.length
= sizeof(*udp
);
586 udp
->vendor_id
= desc
->idVendor
;
587 udp
->product_id
= desc
->idProduct
;
588 udp
->device_class
= desc
->bDeviceClass
;
589 udp
->device_subclass
= desc
->bDeviceSubClass
;
590 udp
->device_protocol
= desc
->bDeviceProtocol
;
595 debug("%s(%u) %s: unhandled device class: %s (%u)\n",
596 __FILE__
, __LINE__
, __func__
,
597 dev
->name
, dev
->driver
->id
);
598 return dp_fill(buf
, dev
->parent
);
602 /* Construct a device-path from a device: */
603 struct efi_device_path
*efi_dp_from_dev(struct udevice
*dev
)
607 start
= buf
= dp_alloc(dp_size(dev
) + sizeof(END
));
610 buf
= dp_fill(buf
, dev
);
611 *((struct efi_device_path
*)buf
) = END
;
617 static unsigned dp_part_size(struct blk_desc
*desc
, int part
)
624 int ret
= blk_find_device(desc
->if_type
, desc
->devnum
, &dev
);
627 dev
= desc
->bdev
->parent
;
628 dpsize
= dp_size(dev
);
631 dpsize
= sizeof(ROOT
) + sizeof(struct efi_device_path_usb
);
634 if (part
== 0) /* the actual disk, not a partition */
637 if (desc
->part_type
== PART_TYPE_ISO
)
638 dpsize
+= sizeof(struct efi_device_path_cdrom_path
);
640 dpsize
+= sizeof(struct efi_device_path_hard_drive_path
);
646 * Create a device node for a block device partition.
648 * @buf buffer to which the device path is written
649 * @desc block device descriptor
650 * @part partition number, 0 identifies a block device
652 static void *dp_part_node(void *buf
, struct blk_desc
*desc
, int part
)
654 disk_partition_t info
;
656 part_get_info(desc
, part
, &info
);
658 if (desc
->part_type
== PART_TYPE_ISO
) {
659 struct efi_device_path_cdrom_path
*cddp
= buf
;
661 cddp
->boot_entry
= part
;
662 cddp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
663 cddp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_CDROM_PATH
;
664 cddp
->dp
.length
= sizeof(*cddp
);
665 cddp
->partition_start
= info
.start
;
666 cddp
->partition_end
= info
.size
;
670 struct efi_device_path_hard_drive_path
*hddp
= buf
;
672 hddp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
673 hddp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH
;
674 hddp
->dp
.length
= sizeof(*hddp
);
675 hddp
->partition_number
= part
;
676 hddp
->partition_start
= info
.start
;
677 hddp
->partition_end
= info
.size
;
678 if (desc
->part_type
== PART_TYPE_EFI
)
679 hddp
->partmap_type
= 2;
681 hddp
->partmap_type
= 1;
683 switch (desc
->sig_type
) {
686 hddp
->signature_type
= 0;
687 memset(hddp
->partition_signature
, 0,
688 sizeof(hddp
->partition_signature
));
691 hddp
->signature_type
= 1;
692 memset(hddp
->partition_signature
, 0,
693 sizeof(hddp
->partition_signature
));
694 memcpy(hddp
->partition_signature
, &desc
->mbr_sig
,
695 sizeof(desc
->mbr_sig
));
698 hddp
->signature_type
= 2;
699 memcpy(hddp
->partition_signature
, &desc
->guid_sig
,
700 sizeof(hddp
->partition_signature
));
711 * Create a device path for a block device or one of its partitions.
713 * @buf buffer to which the device path is written
714 * @desc block device descriptor
715 * @part partition number, 0 identifies a block device
717 static void *dp_part_fill(void *buf
, struct blk_desc
*desc
, int part
)
722 int ret
= blk_find_device(desc
->if_type
, desc
->devnum
, &dev
);
725 dev
= desc
->bdev
->parent
;
726 buf
= dp_fill(buf
, dev
);
730 * We *could* make a more accurate path, by looking at if_type
731 * and handling all the different cases like we do for non-
732 * legacy (i.e. CONFIG_BLK=y) case. But most important thing
733 * is just to have a unique device-path for if_type+devnum.
734 * So map things to a fictitious USB device.
736 struct efi_device_path_usb
*udp
;
738 memcpy(buf
, &ROOT
, sizeof(ROOT
));
742 udp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
743 udp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_USB
;
744 udp
->dp
.length
= sizeof(*udp
);
745 udp
->parent_port_number
= desc
->if_type
;
746 udp
->usb_interface
= desc
->devnum
;
750 if (part
== 0) /* the actual disk, not a partition */
753 return dp_part_node(buf
, desc
, part
);
756 /* Construct a device-path from a partition on a block device: */
757 struct efi_device_path
*efi_dp_from_part(struct blk_desc
*desc
, int part
)
761 start
= buf
= dp_alloc(dp_part_size(desc
, part
) + sizeof(END
));
765 buf
= dp_part_fill(buf
, desc
, part
);
767 *((struct efi_device_path
*)buf
) = END
;
773 * Create a device node for a block device partition.
775 * @buf buffer to which the device path is written
776 * @desc block device descriptor
777 * @part partition number, 0 identifies a block device
779 struct efi_device_path
*efi_dp_part_node(struct blk_desc
*desc
, int part
)
784 if (desc
->part_type
== PART_TYPE_ISO
)
785 dpsize
= sizeof(struct efi_device_path_cdrom_path
);
787 dpsize
= sizeof(struct efi_device_path_hard_drive_path
);
788 buf
= dp_alloc(dpsize
);
790 dp_part_node(buf
, desc
, part
);
795 /* convert path to an UEFI style path (i.e. DOS style backslashes and UTF-16) */
796 static void path_to_uefi(u16
*uefi
, const char *path
)
808 * If desc is NULL, this creates a path with only the file component,
809 * otherwise it creates a full path with both device and file components
811 struct efi_device_path
*efi_dp_from_file(struct blk_desc
*desc
, int part
,
814 struct efi_device_path_file_path
*fp
;
816 unsigned dpsize
= 0, fpsize
;
819 dpsize
= dp_part_size(desc
, part
);
821 fpsize
= sizeof(struct efi_device_path
) + 2 * (strlen(path
) + 1);
824 start
= buf
= dp_alloc(dpsize
+ sizeof(END
));
829 buf
= dp_part_fill(buf
, desc
, part
);
833 fp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
834 fp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
;
835 fp
->dp
.length
= fpsize
;
836 path_to_uefi(fp
->str
, path
);
839 *((struct efi_device_path
*)buf
) = END
;
845 struct efi_device_path
*efi_dp_from_eth(void)
847 #ifndef CONFIG_DM_ETH
848 struct efi_device_path_mac_addr
*ndp
;
853 assert(eth_get_dev());
856 dpsize
+= dp_size(eth_get_dev());
858 dpsize
+= sizeof(ROOT
);
859 dpsize
+= sizeof(*ndp
);
862 start
= buf
= dp_alloc(dpsize
+ sizeof(END
));
867 buf
= dp_fill(buf
, eth_get_dev());
869 memcpy(buf
, &ROOT
, sizeof(ROOT
));
873 ndp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
874 ndp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR
;
875 ndp
->dp
.length
= sizeof(*ndp
);
876 ndp
->if_type
= 1; /* Ethernet */
877 memcpy(ndp
->mac
.addr
, eth_get_ethaddr(), ARP_HLEN
);
881 *((struct efi_device_path
*)buf
) = END
;
887 /* Construct a device-path for memory-mapped image */
888 struct efi_device_path
*efi_dp_from_mem(uint32_t memory_type
,
889 uint64_t start_address
,
890 uint64_t end_address
)
892 struct efi_device_path_memory
*mdp
;
895 start
= buf
= dp_alloc(sizeof(*mdp
) + sizeof(END
));
900 mdp
->dp
.type
= DEVICE_PATH_TYPE_HARDWARE_DEVICE
;
901 mdp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MEMORY
;
902 mdp
->dp
.length
= sizeof(*mdp
);
903 mdp
->memory_type
= memory_type
;
904 mdp
->start_address
= start_address
;
905 mdp
->end_address
= end_address
;
908 *((struct efi_device_path
*)buf
) = END
;
914 * efi_dp_split_file_path() - split of relative file path from device path
916 * Given a device path indicating a file on a device, separate the device
917 * path in two: the device path of the actual device and the file path
918 * relative to this device.
920 * @full_path: device path including device and file path
921 * @device_path: path of the device
922 * @file_path: relative path of the file
923 * Return: status code
925 efi_status_t
efi_dp_split_file_path(struct efi_device_path
*full_path
,
926 struct efi_device_path
**device_path
,
927 struct efi_device_path
**file_path
)
929 struct efi_device_path
*p
, *dp
, *fp
;
933 dp
= efi_dp_dup(full_path
);
935 return EFI_OUT_OF_RESOURCES
;
937 while (!EFI_DP_TYPE(p
, MEDIA_DEVICE
, FILE_PATH
)) {
940 return EFI_INVALID_PARAMETER
;
944 return EFI_OUT_OF_RESOURCES
;
945 p
->type
= DEVICE_PATH_TYPE_END
;
946 p
->sub_type
= DEVICE_PATH_SUB_TYPE_END
;
947 p
->length
= sizeof(*p
);
954 efi_status_t
efi_dp_from_name(const char *dev
, const char *devnr
,
956 struct efi_device_path
**device
,
957 struct efi_device_path
**file
)
960 struct blk_desc
*desc
= NULL
;
961 disk_partition_t fs_partition
;
963 char filename
[32] = { 0 }; /* dp->str is u16[32] long */
967 return EFI_INVALID_PARAMETER
;
969 is_net
= !strcmp(dev
, "Net");
971 part
= blk_get_device_part_str(dev
, devnr
, &desc
, &fs_partition
,
974 return EFI_INVALID_PARAMETER
;
977 *device
= efi_dp_from_part(desc
, part
);
981 *device
= efi_dp_from_eth();
988 snprintf(filename
, sizeof(filename
), "%s", path
);
989 /* DOS style file path: */
991 while ((s
= strchr(s
, '/')))
993 *file
= efi_dp_from_file(((!is_net
&& device
) ? desc
: NULL
),