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>
15 #include <asm-generic/unaligned.h>
17 /* template END node: */
18 static const struct efi_device_path END
= {
19 .type
= DEVICE_PATH_TYPE_END
,
20 .sub_type
= DEVICE_PATH_SUB_TYPE_END
,
21 .length
= sizeof(END
),
24 /* template ROOT node: */
25 static const struct efi_device_path_vendor ROOT
= {
27 .type
= DEVICE_PATH_TYPE_HARDWARE_DEVICE
,
28 .sub_type
= DEVICE_PATH_SUB_TYPE_VENDOR
,
29 .length
= sizeof(ROOT
),
34 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
36 * Determine if an MMC device is an SD card.
38 * @desc block device descriptor
39 * @return true if the device is an SD card
41 static bool is_sd(struct blk_desc
*desc
)
43 struct mmc
*mmc
= find_mmc_device(desc
->devnum
);
48 return IS_SD(mmc
) != 0U;
52 static void *dp_alloc(size_t sz
)
56 if (efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES
, sz
, &buf
) !=
58 debug("EFI: ERROR: out of memory in %s\n", __func__
);
67 * Iterate to next block in device-path, terminating (returning NULL)
70 struct efi_device_path
*efi_dp_next(const struct efi_device_path
*dp
)
74 if (dp
->type
== DEVICE_PATH_TYPE_END
)
76 dp
= ((void *)dp
) + dp
->length
;
77 if (dp
->type
== DEVICE_PATH_TYPE_END
)
79 return (struct efi_device_path
*)dp
;
83 * Compare two device-paths, stopping when the shorter of the two hits
84 * an End* node. This is useful to, for example, compare a device-path
85 * representing a device with one representing a file on the device, or
86 * a device with a parent device.
88 int efi_dp_match(const struct efi_device_path
*a
,
89 const struct efi_device_path
*b
)
94 ret
= memcmp(&a
->length
, &b
->length
, sizeof(a
->length
));
98 ret
= memcmp(a
, b
, a
->length
);
111 * We can have device paths that start with a USB WWID or a USB Class node,
112 * and a few other cases which don't encode the full device path with bus
115 * - MESSAGING:USB_WWID
116 * - MESSAGING:USB_CLASS
121 * See UEFI spec (section 3.1.2, about short-form device-paths)
123 static struct efi_device_path
*shorten_path(struct efi_device_path
*dp
)
127 * TODO: Add MESSAGING:USB_WWID and MESSAGING:URI..
128 * in practice fallback.efi just uses MEDIA:HARD_DRIVE
129 * so not sure when we would see these other cases.
131 if (EFI_DP_TYPE(dp
, MESSAGING_DEVICE
, MSG_USB_CLASS
) ||
132 EFI_DP_TYPE(dp
, MEDIA_DEVICE
, HARD_DRIVE_PATH
) ||
133 EFI_DP_TYPE(dp
, MEDIA_DEVICE
, FILE_PATH
))
136 dp
= efi_dp_next(dp
);
142 static struct efi_object
*find_obj(struct efi_device_path
*dp
, bool short_path
,
143 struct efi_device_path
**rem
)
145 struct efi_object
*efiobj
;
146 efi_uintn_t dp_size
= efi_dp_instance_size(dp
);
148 list_for_each_entry(efiobj
, &efi_obj_list
, link
) {
149 struct efi_handler
*handler
;
150 struct efi_device_path
*obj_dp
;
153 ret
= efi_search_protocol(efiobj
,
154 &efi_guid_device_path
, &handler
);
155 if (ret
!= EFI_SUCCESS
)
157 obj_dp
= handler
->protocol_interface
;
160 if (efi_dp_match(dp
, obj_dp
) == 0) {
163 * Allow partial matches, but inform
166 *rem
= ((void *)dp
) +
167 efi_dp_instance_size(obj_dp
);
170 /* Only return on exact matches */
171 if (efi_dp_instance_size(obj_dp
) ==
177 obj_dp
= shorten_path(efi_dp_next(obj_dp
));
178 } while (short_path
&& obj_dp
);
185 * Find an efiobj from device-path, if 'rem' is not NULL, returns the
186 * remaining part of the device path after the matched object.
188 struct efi_object
*efi_dp_find_obj(struct efi_device_path
*dp
,
189 struct efi_device_path
**rem
)
191 struct efi_object
*efiobj
;
193 /* Search for an exact match first */
194 efiobj
= find_obj(dp
, false, NULL
);
196 /* Then for a fuzzy match */
198 efiobj
= find_obj(dp
, false, rem
);
200 /* And now for a fuzzy short match */
202 efiobj
= find_obj(dp
, true, rem
);
208 * Determine the last device path node that is not the end node.
211 * @return last node before the end node if it exists
214 const struct efi_device_path
*efi_dp_last_node(const struct efi_device_path
*dp
)
216 struct efi_device_path
*ret
;
218 if (!dp
|| dp
->type
== DEVICE_PATH_TYPE_END
)
221 ret
= (struct efi_device_path
*)dp
;
222 dp
= efi_dp_next(dp
);
227 /* get size of the first device path instance excluding end node */
228 efi_uintn_t
efi_dp_instance_size(const struct efi_device_path
*dp
)
232 if (!dp
|| dp
->type
== DEVICE_PATH_TYPE_END
)
236 dp
= efi_dp_next(dp
);
242 /* get size of multi-instance device path excluding end node */
243 efi_uintn_t
efi_dp_size(const struct efi_device_path
*dp
)
245 const struct efi_device_path
*p
= dp
;
249 while (p
->type
!= DEVICE_PATH_TYPE_END
||
250 p
->sub_type
!= DEVICE_PATH_SUB_TYPE_END
)
251 p
= (void *)p
+ p
->length
;
253 return (void *)p
- (void *)dp
;
256 /* copy multi-instance device path */
257 struct efi_device_path
*efi_dp_dup(const struct efi_device_path
*dp
)
259 struct efi_device_path
*ndp
;
260 size_t sz
= efi_dp_size(dp
) + sizeof(END
);
273 struct efi_device_path
*efi_dp_append(const struct efi_device_path
*dp1
,
274 const struct efi_device_path
*dp2
)
276 struct efi_device_path
*ret
;
279 /* return an end node */
280 ret
= efi_dp_dup(&END
);
282 ret
= efi_dp_dup(dp2
);
284 ret
= efi_dp_dup(dp1
);
286 /* both dp1 and dp2 are non-null */
287 unsigned sz1
= efi_dp_size(dp1
);
288 unsigned sz2
= efi_dp_size(dp2
);
289 void *p
= dp_alloc(sz1
+ sz2
+ sizeof(END
));
293 /* the end node of the second device path has to be retained */
294 memcpy(p
+ sz1
, dp2
, sz2
+ sizeof(END
));
301 struct efi_device_path
*efi_dp_append_node(const struct efi_device_path
*dp
,
302 const struct efi_device_path
*node
)
304 struct efi_device_path
*ret
;
307 ret
= efi_dp_dup(&END
);
309 ret
= efi_dp_dup(dp
);
311 size_t sz
= node
->length
;
312 void *p
= dp_alloc(sz
+ sizeof(END
));
316 memcpy(p
+ sz
, &END
, sizeof(END
));
319 /* both dp and node are non-null */
320 size_t sz
= efi_dp_size(dp
);
321 void *p
= dp_alloc(sz
+ node
->length
+ sizeof(END
));
325 memcpy(p
+ sz
, node
, node
->length
);
326 memcpy(p
+ sz
+ node
->length
, &END
, sizeof(END
));
333 struct efi_device_path
*efi_dp_create_device_node(const u8 type
,
337 struct efi_device_path
*ret
;
339 if (length
< sizeof(struct efi_device_path
))
342 ret
= dp_alloc(length
);
346 ret
->sub_type
= sub_type
;
347 ret
->length
= length
;
351 struct efi_device_path
*efi_dp_append_instance(
352 const struct efi_device_path
*dp
,
353 const struct efi_device_path
*dpi
)
356 struct efi_device_path
*p
, *ret
;
361 return efi_dp_dup(dpi
);
362 sz
= efi_dp_size(dp
);
363 szi
= efi_dp_instance_size(dpi
);
364 p
= dp_alloc(sz
+ szi
+ 2 * sizeof(END
));
368 memcpy(p
, dp
, sz
+ sizeof(END
));
370 p
->sub_type
= DEVICE_PATH_SUB_TYPE_INSTANCE_END
;
371 p
= (void *)p
+ sizeof(END
);
374 memcpy(p
, &END
, sizeof(END
));
378 struct efi_device_path
*efi_dp_get_next_instance(struct efi_device_path
**dp
,
382 struct efi_device_path
*p
;
388 sz
= efi_dp_instance_size(*dp
);
389 p
= dp_alloc(sz
+ sizeof(END
));
392 memcpy(p
, *dp
, sz
+ sizeof(END
));
393 *dp
= (void *)*dp
+ sz
;
394 if ((*dp
)->sub_type
== DEVICE_PATH_SUB_TYPE_INSTANCE_END
)
395 *dp
= (void *)*dp
+ sizeof(END
);
399 *size
= sz
+ sizeof(END
);
403 bool efi_dp_is_multi_instance(const struct efi_device_path
*dp
)
405 const struct efi_device_path
*p
= dp
;
409 while (p
->type
!= DEVICE_PATH_TYPE_END
)
410 p
= (void *)p
+ p
->length
;
411 return p
->sub_type
== DEVICE_PATH_SUB_TYPE_INSTANCE_END
;
415 /* size of device-path not including END node for device and all parents
416 * up to the root device.
418 static unsigned dp_size(struct udevice
*dev
)
420 if (!dev
|| !dev
->driver
)
423 switch (dev
->driver
->id
) {
425 case UCLASS_SIMPLE_BUS
:
426 /* stop traversing parents at this point: */
429 return dp_size(dev
->parent
) +
430 sizeof(struct efi_device_path_mac_addr
);
433 switch (dev
->parent
->uclass
->uc_drv
->id
) {
436 return dp_size(dev
->parent
) +
437 sizeof(struct efi_device_path_atapi
);
439 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
441 return dp_size(dev
->parent
) +
442 sizeof(struct efi_device_path_scsi
);
444 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
446 return dp_size(dev
->parent
) +
447 sizeof(struct efi_device_path_sd_mmc_path
);
450 return dp_size(dev
->parent
);
453 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
455 return dp_size(dev
->parent
) +
456 sizeof(struct efi_device_path_sd_mmc_path
);
458 case UCLASS_MASS_STORAGE
:
460 return dp_size(dev
->parent
) +
461 sizeof(struct efi_device_path_usb_class
);
463 /* just skip over unknown classes: */
464 return dp_size(dev
->parent
);
469 * Recursively build a device path.
471 * @buf pointer to the end of the device path
473 * @return pointer to the end of the device path
475 static void *dp_fill(void *buf
, struct udevice
*dev
)
477 if (!dev
|| !dev
->driver
)
480 switch (dev
->driver
->id
) {
482 case UCLASS_SIMPLE_BUS
: {
483 /* stop traversing parents at this point: */
484 struct efi_device_path_vendor
*vdp
= buf
;
490 struct efi_device_path_mac_addr
*dp
=
491 dp_fill(buf
, dev
->parent
);
492 struct eth_pdata
*pdata
= dev
->platdata
;
494 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
495 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR
;
496 dp
->dp
.length
= sizeof(*dp
);
497 memset(&dp
->mac
, 0, sizeof(dp
->mac
));
498 /* We only support IPv4 */
499 memcpy(&dp
->mac
, &pdata
->enetaddr
, ARP_HLEN
);
507 switch (dev
->parent
->uclass
->uc_drv
->id
) {
510 struct efi_device_path_atapi
*dp
=
511 dp_fill(buf
, dev
->parent
);
512 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
514 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
515 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_ATAPI
;
516 dp
->dp
.length
= sizeof(*dp
);
517 dp
->logical_unit_number
= desc
->devnum
;
518 dp
->primary_secondary
= IDE_BUS(desc
->devnum
);
519 dp
->slave_master
= desc
->devnum
%
520 (CONFIG_SYS_IDE_MAXDEVICE
/
521 CONFIG_SYS_IDE_MAXBUS
);
525 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
527 struct efi_device_path_scsi
*dp
=
528 dp_fill(buf
, dev
->parent
);
529 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
531 dp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
532 dp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_SCSI
;
533 dp
->dp
.length
= sizeof(*dp
);
534 dp
->logical_unit_number
= desc
->lun
;
535 dp
->target_id
= desc
->target
;
539 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
541 struct efi_device_path_sd_mmc_path
*sddp
=
542 dp_fill(buf
, dev
->parent
);
543 struct blk_desc
*desc
= dev_get_uclass_platdata(dev
);
545 sddp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
546 sddp
->dp
.sub_type
= is_sd(desc
) ?
547 DEVICE_PATH_SUB_TYPE_MSG_SD
:
548 DEVICE_PATH_SUB_TYPE_MSG_MMC
;
549 sddp
->dp
.length
= sizeof(*sddp
);
550 sddp
->slot_number
= dev
->seq
;
555 debug("%s(%u) %s: unhandled parent class: %s (%u)\n",
556 __FILE__
, __LINE__
, __func__
,
557 dev
->name
, dev
->parent
->uclass
->uc_drv
->id
);
558 return dp_fill(buf
, dev
->parent
);
561 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
563 struct efi_device_path_sd_mmc_path
*sddp
=
564 dp_fill(buf
, dev
->parent
);
565 struct mmc
*mmc
= mmc_get_mmc_dev(dev
);
566 struct blk_desc
*desc
= mmc_get_blk_desc(mmc
);
568 sddp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
569 sddp
->dp
.sub_type
= is_sd(desc
) ?
570 DEVICE_PATH_SUB_TYPE_MSG_SD
:
571 DEVICE_PATH_SUB_TYPE_MSG_MMC
;
572 sddp
->dp
.length
= sizeof(*sddp
);
573 sddp
->slot_number
= dev
->seq
;
578 case UCLASS_MASS_STORAGE
:
579 case UCLASS_USB_HUB
: {
580 struct efi_device_path_usb_class
*udp
=
581 dp_fill(buf
, dev
->parent
);
582 struct usb_device
*udev
= dev_get_parent_priv(dev
);
583 struct usb_device_descriptor
*desc
= &udev
->descriptor
;
585 udp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
586 udp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS
;
587 udp
->dp
.length
= sizeof(*udp
);
588 udp
->vendor_id
= desc
->idVendor
;
589 udp
->product_id
= desc
->idProduct
;
590 udp
->device_class
= desc
->bDeviceClass
;
591 udp
->device_subclass
= desc
->bDeviceSubClass
;
592 udp
->device_protocol
= desc
->bDeviceProtocol
;
597 debug("%s(%u) %s: unhandled device class: %s (%u)\n",
598 __FILE__
, __LINE__
, __func__
,
599 dev
->name
, dev
->driver
->id
);
600 return dp_fill(buf
, dev
->parent
);
604 /* Construct a device-path from a device: */
605 struct efi_device_path
*efi_dp_from_dev(struct udevice
*dev
)
609 start
= buf
= dp_alloc(dp_size(dev
) + sizeof(END
));
612 buf
= dp_fill(buf
, dev
);
613 *((struct efi_device_path
*)buf
) = END
;
619 static unsigned dp_part_size(struct blk_desc
*desc
, int part
)
626 int ret
= blk_find_device(desc
->if_type
, desc
->devnum
, &dev
);
629 dev
= desc
->bdev
->parent
;
630 dpsize
= dp_size(dev
);
633 dpsize
= sizeof(ROOT
) + sizeof(struct efi_device_path_usb
);
636 if (part
== 0) /* the actual disk, not a partition */
639 if (desc
->part_type
== PART_TYPE_ISO
)
640 dpsize
+= sizeof(struct efi_device_path_cdrom_path
);
642 dpsize
+= sizeof(struct efi_device_path_hard_drive_path
);
648 * Create a device node for a block device partition.
650 * @buf buffer to which the device path is written
651 * @desc block device descriptor
652 * @part partition number, 0 identifies a block device
654 static void *dp_part_node(void *buf
, struct blk_desc
*desc
, int part
)
656 disk_partition_t info
;
658 part_get_info(desc
, part
, &info
);
660 if (desc
->part_type
== PART_TYPE_ISO
) {
661 struct efi_device_path_cdrom_path
*cddp
= buf
;
663 cddp
->boot_entry
= part
;
664 cddp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
665 cddp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_CDROM_PATH
;
666 cddp
->dp
.length
= sizeof(*cddp
);
667 cddp
->partition_start
= info
.start
;
668 cddp
->partition_end
= info
.size
;
672 struct efi_device_path_hard_drive_path
*hddp
= buf
;
674 hddp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
675 hddp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH
;
676 hddp
->dp
.length
= sizeof(*hddp
);
677 hddp
->partition_number
= part
;
678 hddp
->partition_start
= info
.start
;
679 hddp
->partition_end
= info
.size
;
680 if (desc
->part_type
== PART_TYPE_EFI
)
681 hddp
->partmap_type
= 2;
683 hddp
->partmap_type
= 1;
685 switch (desc
->sig_type
) {
688 hddp
->signature_type
= 0;
689 memset(hddp
->partition_signature
, 0,
690 sizeof(hddp
->partition_signature
));
693 hddp
->signature_type
= 1;
694 memset(hddp
->partition_signature
, 0,
695 sizeof(hddp
->partition_signature
));
696 memcpy(hddp
->partition_signature
, &desc
->mbr_sig
,
697 sizeof(desc
->mbr_sig
));
700 hddp
->signature_type
= 2;
701 memcpy(hddp
->partition_signature
, &desc
->guid_sig
,
702 sizeof(hddp
->partition_signature
));
713 * Create a device path for a block device or one of its partitions.
715 * @buf buffer to which the device path is written
716 * @desc block device descriptor
717 * @part partition number, 0 identifies a block device
719 static void *dp_part_fill(void *buf
, struct blk_desc
*desc
, int part
)
724 int ret
= blk_find_device(desc
->if_type
, desc
->devnum
, &dev
);
727 dev
= desc
->bdev
->parent
;
728 buf
= dp_fill(buf
, dev
);
732 * We *could* make a more accurate path, by looking at if_type
733 * and handling all the different cases like we do for non-
734 * legacy (i.e. CONFIG_BLK=y) case. But most important thing
735 * is just to have a unique device-path for if_type+devnum.
736 * So map things to a fictitious USB device.
738 struct efi_device_path_usb
*udp
;
740 memcpy(buf
, &ROOT
, sizeof(ROOT
));
744 udp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
745 udp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_USB
;
746 udp
->dp
.length
= sizeof(*udp
);
747 udp
->parent_port_number
= desc
->if_type
;
748 udp
->usb_interface
= desc
->devnum
;
752 if (part
== 0) /* the actual disk, not a partition */
755 return dp_part_node(buf
, desc
, part
);
758 /* Construct a device-path from a partition on a block device: */
759 struct efi_device_path
*efi_dp_from_part(struct blk_desc
*desc
, int part
)
763 start
= buf
= dp_alloc(dp_part_size(desc
, part
) + sizeof(END
));
767 buf
= dp_part_fill(buf
, desc
, part
);
769 *((struct efi_device_path
*)buf
) = END
;
775 * Create a device node for a block device partition.
777 * @buf buffer to which the device path is written
778 * @desc block device descriptor
779 * @part partition number, 0 identifies a block device
781 struct efi_device_path
*efi_dp_part_node(struct blk_desc
*desc
, int part
)
786 if (desc
->part_type
== PART_TYPE_ISO
)
787 dpsize
= sizeof(struct efi_device_path_cdrom_path
);
789 dpsize
= sizeof(struct efi_device_path_hard_drive_path
);
790 buf
= dp_alloc(dpsize
);
792 dp_part_node(buf
, desc
, part
);
798 * path_to_uefi() - convert UTF-8 path to an UEFI style path
800 * Convert UTF-8 path to a UEFI style path (i.e. with backslashes as path
801 * separators and UTF-16).
803 * @src: source buffer
804 * @uefi: target buffer, possibly unaligned
806 static void path_to_uefi(void *uefi
, const char *src
)
811 * efi_set_bootdev() calls this routine indirectly before the UEFI
812 * subsystem is initialized. So we cannot assume unaligned access to be
818 s32 code
= utf8_get(&src
);
822 else if (code
== '/')
824 utf16_put(code
, &pos
);
830 * If desc is NULL, this creates a path with only the file component,
831 * otherwise it creates a full path with both device and file components
833 struct efi_device_path
*efi_dp_from_file(struct blk_desc
*desc
, int part
,
836 struct efi_device_path_file_path
*fp
;
838 unsigned dpsize
= 0, fpsize
;
841 dpsize
= dp_part_size(desc
, part
);
843 fpsize
= sizeof(struct efi_device_path
) +
844 2 * (utf8_utf16_strlen(path
) + 1);
847 start
= buf
= dp_alloc(dpsize
+ sizeof(END
));
852 buf
= dp_part_fill(buf
, desc
, part
);
856 fp
->dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
;
857 fp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
;
858 fp
->dp
.length
= fpsize
;
859 path_to_uefi(fp
->str
, path
);
862 *((struct efi_device_path
*)buf
) = END
;
868 struct efi_device_path
*efi_dp_from_eth(void)
870 #ifndef CONFIG_DM_ETH
871 struct efi_device_path_mac_addr
*ndp
;
876 assert(eth_get_dev());
879 dpsize
+= dp_size(eth_get_dev());
881 dpsize
+= sizeof(ROOT
);
882 dpsize
+= sizeof(*ndp
);
885 start
= buf
= dp_alloc(dpsize
+ sizeof(END
));
890 buf
= dp_fill(buf
, eth_get_dev());
892 memcpy(buf
, &ROOT
, sizeof(ROOT
));
896 ndp
->dp
.type
= DEVICE_PATH_TYPE_MESSAGING_DEVICE
;
897 ndp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR
;
898 ndp
->dp
.length
= sizeof(*ndp
);
899 ndp
->if_type
= 1; /* Ethernet */
900 memcpy(ndp
->mac
.addr
, eth_get_ethaddr(), ARP_HLEN
);
904 *((struct efi_device_path
*)buf
) = END
;
910 /* Construct a device-path for memory-mapped image */
911 struct efi_device_path
*efi_dp_from_mem(uint32_t memory_type
,
912 uint64_t start_address
,
913 uint64_t end_address
)
915 struct efi_device_path_memory
*mdp
;
918 start
= buf
= dp_alloc(sizeof(*mdp
) + sizeof(END
));
923 mdp
->dp
.type
= DEVICE_PATH_TYPE_HARDWARE_DEVICE
;
924 mdp
->dp
.sub_type
= DEVICE_PATH_SUB_TYPE_MEMORY
;
925 mdp
->dp
.length
= sizeof(*mdp
);
926 mdp
->memory_type
= memory_type
;
927 mdp
->start_address
= start_address
;
928 mdp
->end_address
= end_address
;
931 *((struct efi_device_path
*)buf
) = END
;
937 * efi_dp_split_file_path() - split of relative file path from device path
939 * Given a device path indicating a file on a device, separate the device
940 * path in two: the device path of the actual device and the file path
941 * relative to this device.
943 * @full_path: device path including device and file path
944 * @device_path: path of the device
945 * @file_path: relative path of the file or NULL if there is none
946 * Return: status code
948 efi_status_t
efi_dp_split_file_path(struct efi_device_path
*full_path
,
949 struct efi_device_path
**device_path
,
950 struct efi_device_path
**file_path
)
952 struct efi_device_path
*p
, *dp
, *fp
= NULL
;
956 dp
= efi_dp_dup(full_path
);
958 return EFI_OUT_OF_RESOURCES
;
960 while (!EFI_DP_TYPE(p
, MEDIA_DEVICE
, FILE_PATH
)) {
967 return EFI_OUT_OF_RESOURCES
;
968 p
->type
= DEVICE_PATH_TYPE_END
;
969 p
->sub_type
= DEVICE_PATH_SUB_TYPE_END
;
970 p
->length
= sizeof(*p
);
978 efi_status_t
efi_dp_from_name(const char *dev
, const char *devnr
,
980 struct efi_device_path
**device
,
981 struct efi_device_path
**file
)
984 struct blk_desc
*desc
= NULL
;
985 disk_partition_t fs_partition
;
987 char filename
[32] = { 0 }; /* dp->str is u16[32] long */
991 return EFI_INVALID_PARAMETER
;
993 is_net
= !strcmp(dev
, "Net");
995 part
= blk_get_device_part_str(dev
, devnr
, &desc
, &fs_partition
,
997 if (part
< 0 || !desc
)
998 return EFI_INVALID_PARAMETER
;
1001 *device
= efi_dp_from_part(desc
, part
);
1005 *device
= efi_dp_from_eth();
1012 snprintf(filename
, sizeof(filename
), "%s", path
);
1013 /* DOS style file path: */
1015 while ((s
= strchr(s
, '/')))
1017 *file
= efi_dp_from_file(((!is_net
&& device
) ? desc
: NULL
),