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[J-u-boot.git] / lib / efi_loader / efi_device_path.c
CommitLineData
b66c60dd
RC		 1/*
2 * EFI device path from u-boot device-model mapping
3 *
4 * (C) Copyright 2017 Rob Clark
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
8
9dfd84da
HS		 9#define LOG_CATEGORY LOGL_ERR
10
b66c60dd
RC		 11#include <common.h>
12#include <blk.h>
13#include <dm.h>
14#include <usb.h>
15#include <mmc.h>
16#include <efi_loader.h>
17#include <inttypes.h>
18#include <part.h>
19
20/* template END node: */
21static const struct efi_device_path END = {
22 .type = DEVICE_PATH_TYPE_END,
23 .sub_type = DEVICE_PATH_SUB_TYPE_END,
24 .length = sizeof(END),
25};
26
27#define U_BOOT_GUID \
28 EFI_GUID(0xe61d73b9, 0xa384, 0x4acc, \
29 0xae, 0xab, 0x82, 0xe8, 0x28, 0xf3, 0x62, 0x8b)
30
31/* template ROOT node: */
32static const struct efi_device_path_vendor ROOT = {
33 .dp = {
34 .type = DEVICE_PATH_TYPE_HARDWARE_DEVICE,
35 .sub_type = DEVICE_PATH_SUB_TYPE_VENDOR,
36 .length = sizeof(ROOT),
37 },
38 .guid = U_BOOT_GUID,
39};
40
66b051d5
HS		 41#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
42/*
43 * Determine if an MMC device is an SD card.
44 *
45 * @desc block device descriptor
46 * @return true if the device is an SD card
47 */
48static bool is_sd(struct blk_desc *desc)
49{
50 struct mmc *mmc = find_mmc_device(desc->devnum);
51
52 if (!mmc)
53 return false;
54
55 return IS_SD(mmc) != 0U;
56}
57#endif
58
b66c60dd
RC		 59static void *dp_alloc(size_t sz)
60{
61 void *buf;
62
04298686
HS		 63 if (efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, sz, &buf) !=
64 EFI_SUCCESS) {
65 debug("EFI: ERROR: out of memory in %s\n", __func__);
b66c60dd 66 return NULL;
04298686 67 }
b66c60dd
RC		 68
69 return buf;
70}
71
72/*
73 * Iterate to next block in device-path, terminating (returning NULL)
74 * at /End* node.
75 */
76struct efi_device_path *efi_dp_next(const struct efi_device_path *dp)
77{
78 if (dp == NULL)
79 return NULL;
80 if (dp->type == DEVICE_PATH_TYPE_END)
81 return NULL;
82 dp = ((void *)dp) + dp->length;
83 if (dp->type == DEVICE_PATH_TYPE_END)
84 return NULL;
85 return (struct efi_device_path *)dp;
86}
87
88/*
89 * Compare two device-paths, stopping when the shorter of the two hits
90 * an End* node. This is useful to, for example, compare a device-path
91 * representing a device with one representing a file on the device, or
92 * a device with a parent device.
93 */
ff401d3f
HS		 94int efi_dp_match(const struct efi_device_path *a,
95 const struct efi_device_path *b)
b66c60dd
RC		 96{
97 while (1) {
98 int ret;
99
100 ret = memcmp(&a->length, &b->length, sizeof(a->length));
101 if (ret)
102 return ret;
103
104 ret = memcmp(a, b, a->length);
105 if (ret)
106 return ret;
107
108 a = efi_dp_next(a);
109 b = efi_dp_next(b);
110
111 if (!a || !b)
112 return 0;
113 }
114}
115
b66c60dd
RC		 116/*
117 * See UEFI spec (section 3.1.2, about short-form device-paths..
118 * tl;dr: we can have a device-path that starts with a USB WWID
119 * or USB Class node, and a few other cases which don't encode
120 * the full device path with bus hierarchy:
121 *
122 * - MESSAGING:USB_WWID
123 * - MESSAGING:USB_CLASS
124 * - MEDIA:FILE_PATH
125 * - MEDIA:HARD_DRIVE
126 * - MESSAGING:URI
127 */
128static struct efi_device_path *shorten_path(struct efi_device_path *dp)
129{
130 while (dp) {
131 /*
132 * TODO: Add MESSAGING:USB_WWID and MESSAGING:URI..
133 * in practice fallback.efi just uses MEDIA:HARD_DRIVE
134 * so not sure when we would see these other cases.
135 */
136 if (EFI_DP_TYPE(dp, MESSAGING_DEVICE, MSG_USB_CLASS) ||
137 EFI_DP_TYPE(dp, MEDIA_DEVICE, HARD_DRIVE_PATH) ||
138 EFI_DP_TYPE(dp, MEDIA_DEVICE, FILE_PATH))
139 return dp;
140
141 dp = efi_dp_next(dp);
142 }
143
144 return dp;
145}
146
147static struct efi_object *find_obj(struct efi_device_path *dp, bool short_path,
148 struct efi_device_path **rem)
149{
150 struct efi_object *efiobj;
905cb9e1 151 unsigned int dp_size = efi_dp_size(dp);
b66c60dd
RC		 152
153 list_for_each_entry(efiobj, &efi_obj_list, link) {
72292aba
HS		 154 struct efi_handler *handler;
155 struct efi_device_path *obj_dp;
156 efi_status_t ret;
157
158 ret = efi_search_protocol(efiobj->handle,
159 &efi_guid_device_path, &handler);
160 if (ret != EFI_SUCCESS)
161 continue;
162 obj_dp = handler->protocol_interface;
163
164 do {
165 if (efi_dp_match(dp, obj_dp) == 0) {
166 if (rem) {
905cb9e1
AG		 167 /*
168 * Allow partial matches, but inform
169 * the caller.
170 */
72292aba
HS		 171 *rem = ((void *)dp) +
172 efi_dp_size(obj_dp);
905cb9e1
AG		 173 return efiobj;
174 } else {
175 /* Only return on exact matches */
176 if (efi_dp_size(obj_dp) == dp_size)
177 return efiobj;
b66c60dd 178 }
72292aba 179 }
b66c60dd 180
72292aba
HS		 181 obj_dp = shorten_path(efi_dp_next(obj_dp));
182 } while (short_path && obj_dp);
b66c60dd
RC		 183 }
184
185 return NULL;
186}
187
b66c60dd
RC		 188/*
189 * Find an efiobj from device-path, if 'rem' is not NULL, returns the
190 * remaining part of the device path after the matched object.
191 */
192struct efi_object *efi_dp_find_obj(struct efi_device_path *dp,
193 struct efi_device_path **rem)
194{
195 struct efi_object *efiobj;
196
905cb9e1
AG		 197 /* Search for an exact match first */
198 efiobj = find_obj(dp, false, NULL);
b66c60dd 199
905cb9e1
AG		 200 /* Then for a fuzzy match */
201 if (!efiobj)
202 efiobj = find_obj(dp, false, rem);
203
204 /* And now for a fuzzy short match */
b66c60dd
RC		 205 if (!efiobj)
206 efiobj = find_obj(dp, true, rem);
207
208 return efiobj;
209}
210
65436f91
HS		 211/*
212 * Determine the last device path node that is not the end node.
213 *
214 * @dp device path
215 * @return last node before the end node if it exists
216 * otherwise NULL
217 */
218const struct efi_device_path *efi_dp_last_node(const struct efi_device_path *dp)
219{
220 struct efi_device_path *ret;
221
222 if (!dp || dp->type == DEVICE_PATH_TYPE_END)
223 return NULL;
224 while (dp) {
225 ret = (struct efi_device_path *)dp;
226 dp = efi_dp_next(dp);
227 }
228 return ret;
229}
230
b66c60dd
RC		 231/* return size not including End node: */
232unsigned efi_dp_size(const struct efi_device_path *dp)
233{
234 unsigned sz = 0;
235
236 while (dp) {
237 sz += dp->length;
238 dp = efi_dp_next(dp);
239 }
240
241 return sz;
242}
243
244struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp)
245{
246 struct efi_device_path *ndp;
247 unsigned sz = efi_dp_size(dp) + sizeof(END);
248
249 if (!dp)
250 return NULL;
251
252 ndp = dp_alloc(sz);
04298686
HS		 253 if (!ndp)
254 return NULL;
b66c60dd
RC		 255 memcpy(ndp, dp, sz);
256
257 return ndp;
258}
259
260struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1,
261 const struct efi_device_path *dp2)
262{
263 struct efi_device_path *ret;
264
265 if (!dp1) {
266 ret = efi_dp_dup(dp2);
267 } else if (!dp2) {
268 ret = efi_dp_dup(dp1);
269 } else {
270 /* both dp1 and dp2 are non-null */
271 unsigned sz1 = efi_dp_size(dp1);
272 unsigned sz2 = efi_dp_size(dp2);
273 void *p = dp_alloc(sz1 + sz2 + sizeof(END));
04298686
HS		 274 if (!p)
275 return NULL;
b66c60dd
RC		 276 memcpy(p, dp1, sz1);
277 memcpy(p + sz1, dp2, sz2);
278 memcpy(p + sz1 + sz2, &END, sizeof(END));
279 ret = p;
280 }
281
282 return ret;
283}
284
285struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp,
286 const struct efi_device_path *node)
287{
288 struct efi_device_path *ret;
289
290 if (!node && !dp) {
291 ret = efi_dp_dup(&END);
292 } else if (!node) {
293 ret = efi_dp_dup(dp);
294 } else if (!dp) {
295 unsigned sz = node->length;
296 void *p = dp_alloc(sz + sizeof(END));
04298686
HS		 297 if (!p)
298 return NULL;
b66c60dd
RC		 299 memcpy(p, node, sz);
300 memcpy(p + sz, &END, sizeof(END));
301 ret = p;
302 } else {
303 /* both dp and node are non-null */
304 unsigned sz = efi_dp_size(dp);
305 void *p = dp_alloc(sz + node->length + sizeof(END));
04298686
HS		 306 if (!p)
307 return NULL;
b66c60dd
RC		 308 memcpy(p, dp, sz);
309 memcpy(p + sz, node, node->length);
310 memcpy(p + sz + node->length, &END, sizeof(END));
311 ret = p;
312 }
313
314 return ret;
315}
316
317#ifdef CONFIG_DM
318/* size of device-path not including END node for device and all parents
319 * up to the root device.
320 */
321static unsigned dp_size(struct udevice *dev)
322{
323 if (!dev || !dev->driver)
324 return sizeof(ROOT);
325
326 switch (dev->driver->id) {
327 case UCLASS_ROOT:
328 case UCLASS_SIMPLE_BUS:
329 /* stop traversing parents at this point: */
330 return sizeof(ROOT);
9dfd84da
HS		 331 case UCLASS_ETH:
332 return dp_size(dev->parent) +
333 sizeof(struct efi_device_path_mac_addr);
af3106a1
HS		 334#ifdef CONFIG_BLK
335 case UCLASS_BLK:
336 switch (dev->parent->uclass->uc_drv->id) {
337#ifdef CONFIG_IDE
338 case UCLASS_IDE:
339 return dp_size(dev->parent) +
340 sizeof(struct efi_device_path_atapi);
341#endif
342#if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
343 case UCLASS_SCSI:
344 return dp_size(dev->parent) +
345 sizeof(struct efi_device_path_scsi);
9dfd84da
HS		 346#endif
347#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
348 case UCLASS_MMC:
349 return dp_size(dev->parent) +
350 sizeof(struct efi_device_path_sd_mmc_path);
af3106a1
HS		 351#endif
352 default:
353 return dp_size(dev->parent);
354 }
355#endif
9dfd84da 356#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
b66c60dd
RC		 357 case UCLASS_MMC:
358 return dp_size(dev->parent) +
359 sizeof(struct efi_device_path_sd_mmc_path);
9dfd84da 360#endif
b66c60dd
RC		 361 case UCLASS_MASS_STORAGE:
362 case UCLASS_USB_HUB:
363 return dp_size(dev->parent) +
364 sizeof(struct efi_device_path_usb_class);
365 default:
366 /* just skip over unknown classes: */
367 return dp_size(dev->parent);
368 }
369}
370
af3106a1
HS		 371/*
372 * Recursively build a device path.
373 *
374 * @buf pointer to the end of the device path
375 * @dev device
376 * @return pointer to the end of the device path
377 */
b66c60dd
RC		 378static void *dp_fill(void *buf, struct udevice *dev)
379{
380 if (!dev || !dev->driver)
381 return buf;
382
383 switch (dev->driver->id) {
384 case UCLASS_ROOT:
385 case UCLASS_SIMPLE_BUS: {
386 /* stop traversing parents at this point: */
387 struct efi_device_path_vendor *vdp = buf;
388 *vdp = ROOT;
389 return &vdp[1];
390 }
9dfd84da
HS		 391#ifdef CONFIG_DM_ETH
392 case UCLASS_ETH: {
393 struct efi_device_path_mac_addr *dp =
394 dp_fill(buf, dev->parent);
395 struct eth_pdata *pdata = dev->platdata;
396
397 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
398 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR;
399 dp->dp.length = sizeof(*dp);
400 memset(&dp->mac, 0, sizeof(dp->mac));
401 /* We only support IPv4 */
402 memcpy(&dp->mac, &pdata->enetaddr, ARP_HLEN);
403 /* Ethernet */
404 dp->if_type = 1;
405 return &dp[1];
406 }
407#endif
af3106a1
HS		 408#ifdef CONFIG_BLK
409 case UCLASS_BLK:
410 switch (dev->parent->uclass->uc_drv->id) {
411#ifdef CONFIG_IDE
412 case UCLASS_IDE: {
413 struct efi_device_path_atapi *dp =
414 dp_fill(buf, dev->parent);
415 struct blk_desc *desc = dev_get_uclass_platdata(dev);
416
417 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
418 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_ATAPI;
419 dp->dp.length = sizeof(*dp);
420 dp->logical_unit_number = desc->devnum;
421 dp->primary_secondary = IDE_BUS(desc->devnum);
422 dp->slave_master = desc->devnum %
423 (CONFIG_SYS_IDE_MAXDEVICE /
424 CONFIG_SYS_IDE_MAXBUS);
425 return &dp[1];
426 }
427#endif
428#if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
429 case UCLASS_SCSI: {
430 struct efi_device_path_scsi *dp =
431 dp_fill(buf, dev->parent);
432 struct blk_desc *desc = dev_get_uclass_platdata(dev);
433
434 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
435 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_SCSI;
436 dp->dp.length = sizeof(*dp);
437 dp->logical_unit_number = desc->lun;
438 dp->target_id = desc->target;
439 return &dp[1];
440 }
9dfd84da
HS		 441#endif
442#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
443 case UCLASS_MMC: {
444 struct efi_device_path_sd_mmc_path *sddp =
445 dp_fill(buf, dev->parent);
446 struct blk_desc *desc = dev_get_uclass_platdata(dev);
447
448 sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
449 sddp->dp.sub_type = is_sd(desc) ?
450 DEVICE_PATH_SUB_TYPE_MSG_SD :
451 DEVICE_PATH_SUB_TYPE_MSG_MMC;
452 sddp->dp.length = sizeof(*sddp);
453 sddp->slot_number = dev->seq;
454 return &sddp[1];
455 }
af3106a1
HS		 456#endif
457 default:
9dfd84da
HS		 458 debug("%s(%u) %s: unhandled parent class: %s (%u)\n",
459 __FILE__, __LINE__, __func__,
460 dev->name, dev->parent->uclass->uc_drv->id);
af3106a1
HS		 461 return dp_fill(buf, dev->parent);
462 }
463#endif
b66c60dd
RC		 464#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
465 case UCLASS_MMC: {
466 struct efi_device_path_sd_mmc_path *sddp =
467 dp_fill(buf, dev->parent);
468 struct mmc *mmc = mmc_get_mmc_dev(dev);
469 struct blk_desc *desc = mmc_get_blk_desc(mmc);
470
471 sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
66b051d5
HS		 472 sddp->dp.sub_type = is_sd(desc) ?
473 DEVICE_PATH_SUB_TYPE_MSG_SD :
474 DEVICE_PATH_SUB_TYPE_MSG_MMC;
b66c60dd
RC		 475 sddp->dp.length = sizeof(*sddp);
476 sddp->slot_number = dev->seq;
477
478 return &sddp[1];
479 }
480#endif
481 case UCLASS_MASS_STORAGE:
482 case UCLASS_USB_HUB: {
483 struct efi_device_path_usb_class *udp =
484 dp_fill(buf, dev->parent);
485 struct usb_device *udev = dev_get_parent_priv(dev);
486 struct usb_device_descriptor *desc = &udev->descriptor;
487
488 udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
489 udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS;
490 udp->dp.length = sizeof(*udp);
491 udp->vendor_id = desc->idVendor;
492 udp->product_id = desc->idProduct;
493 udp->device_class = desc->bDeviceClass;
494 udp->device_subclass = desc->bDeviceSubClass;
495 udp->device_protocol = desc->bDeviceProtocol;
496
497 return &udp[1];
498 }
499 default:
9dfd84da
HS		 500 debug("%s(%u) %s: unhandled device class: %s (%u)\n",
501 __FILE__, __LINE__, __func__,
b66c60dd
RC		 502 dev->name, dev->driver->id);
503 return dp_fill(buf, dev->parent);
504 }
505}
506
507/* Construct a device-path from a device: */
508struct efi_device_path *efi_dp_from_dev(struct udevice *dev)
509{
510 void *buf, *start;
511
512 start = buf = dp_alloc(dp_size(dev) + sizeof(END));
04298686
HS		 513 if (!buf)
514 return NULL;
b66c60dd
RC		 515 buf = dp_fill(buf, dev);
516 *((struct efi_device_path *)buf) = END;
517
518 return start;
519}
520#endif
521
522static unsigned dp_part_size(struct blk_desc *desc, int part)
523{
524 unsigned dpsize;
525
526#ifdef CONFIG_BLK
2bc61b83
HS		 527 {
528 struct udevice *dev;
529 int ret = blk_find_device(desc->if_type, desc->devnum, &dev);
530
531 if (ret)
532 dev = desc->bdev->parent;
533 dpsize = dp_size(dev);
534 }
b66c60dd
RC		 535#else
536 dpsize = sizeof(ROOT) + sizeof(struct efi_device_path_usb);
537#endif
538
539 if (part == 0) /* the actual disk, not a partition */
540 return dpsize;
541
542 if (desc->part_type == PART_TYPE_ISO)
543 dpsize += sizeof(struct efi_device_path_cdrom_path);
544 else
545 dpsize += sizeof(struct efi_device_path_hard_drive_path);
546
547 return dpsize;
548}
549
bde6bfe4 550/*
98d48bdf 551 * Create a device node for a block device partition.
bde6bfe4
HS		 552 *
553 * @buf buffer to which the device path is wirtten
554 * @desc block device descriptor
555 * @part partition number, 0 identifies a block device
556 */
98d48bdf 557static void *dp_part_node(void *buf, struct blk_desc *desc, int part)
b66c60dd
RC		 558{
559 disk_partition_t info;
560
b66c60dd
RC		 561 part_get_info(desc, part, &info);
562
563 if (desc->part_type == PART_TYPE_ISO) {
564 struct efi_device_path_cdrom_path *cddp = buf;
565
7b982f00 566 cddp->boot_entry = part;
b66c60dd
RC		 567 cddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
568 cddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_CDROM_PATH;
569 cddp->dp.length = sizeof(*cddp);
570 cddp->partition_start = info.start;
571 cddp->partition_end = info.size;
572
573 buf = &cddp[1];
574 } else {
575 struct efi_device_path_hard_drive_path *hddp = buf;
576
577 hddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
578 hddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH;
579 hddp->dp.length = sizeof(*hddp);
7b982f00 580 hddp->partition_number = part;
b66c60dd
RC		 581 hddp->partition_start = info.start;
582 hddp->partition_end = info.size;
583 if (desc->part_type == PART_TYPE_EFI)
584 hddp->partmap_type = 2;
585 else
586 hddp->partmap_type = 1;
b6e9e097
JG		 587
588 switch (desc->sig_type) {
589 case SIG_TYPE_NONE:
590 default:
591 hddp->signature_type = 0;
592 memset(hddp->partition_signature, 0,
593 sizeof(hddp->partition_signature));
594 break;
595 case SIG_TYPE_MBR:
596 hddp->signature_type = 1;
597 memset(hddp->partition_signature, 0,
598 sizeof(hddp->partition_signature));
599 memcpy(hddp->partition_signature, &desc->mbr_sig,
600 sizeof(desc->mbr_sig));
601 break;
602 case SIG_TYPE_GUID:
603 hddp->signature_type = 2;
b66c60dd
RC		 604 memcpy(hddp->partition_signature, &desc->guid_sig,
605 sizeof(hddp->partition_signature));
b6e9e097
JG		 606 break;
607 }
b66c60dd
RC		 608
609 buf = &hddp[1];
610 }
611
612 return buf;
613}
614
98d48bdf
HS		 615/*
616 * Create a device path for a block device or one of its partitions.
617 *
618 * @buf buffer to which the device path is wirtten
619 * @desc block device descriptor
620 * @part partition number, 0 identifies a block device
621 */
622static void *dp_part_fill(void *buf, struct blk_desc *desc, int part)
623{
624#ifdef CONFIG_BLK
625 {
626 struct udevice *dev;
627 int ret = blk_find_device(desc->if_type, desc->devnum, &dev);
628
629 if (ret)
630 dev = desc->bdev->parent;
631 buf = dp_fill(buf, dev);
632 }
633#else
634 /*
635 * We *could* make a more accurate path, by looking at if_type
636 * and handling all the different cases like we do for non-
637 * legacy (ie CONFIG_BLK=y) case. But most important thing
638 * is just to have a unique device-path for if_type+devnum.
639 * So map things to a fictitious USB device.
640 */
641 struct efi_device_path_usb *udp;
642
643 memcpy(buf, &ROOT, sizeof(ROOT));
644 buf += sizeof(ROOT);
645
646 udp = buf;
647 udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
648 udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB;
649 udp->dp.length = sizeof(*udp);
650 udp->parent_port_number = desc->if_type;
651 udp->usb_interface = desc->devnum;
652 buf = &udp[1];
653#endif
654
655 if (part == 0) /* the actual disk, not a partition */
656 return buf;
657
658 return dp_part_node(buf, desc, part);
659}
b66c60dd
RC		 660
661/* Construct a device-path from a partition on a blk device: */
662struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part)
663{
664 void *buf, *start;
665
666 start = buf = dp_alloc(dp_part_size(desc, part) + sizeof(END));
04298686
HS		 667 if (!buf)
668 return NULL;
b66c60dd
RC		 669
670 buf = dp_part_fill(buf, desc, part);
671
672 *((struct efi_device_path *)buf) = END;
673
674 return start;
675}
676
98d48bdf
HS		 677/*
678 * Create a device node for a block device partition.
679 *
680 * @buf buffer to which the device path is wirtten
681 * @desc block device descriptor
682 * @part partition number, 0 identifies a block device
683 */
684struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part)
685{
686 efi_uintn_t dpsize;
687 void *buf;
688
689 if (desc->part_type == PART_TYPE_ISO)
690 dpsize = sizeof(struct efi_device_path_cdrom_path);
691 else
692 dpsize = sizeof(struct efi_device_path_hard_drive_path);
693 buf = dp_alloc(dpsize);
694
695 dp_part_node(buf, desc, part);
696
697 return buf;
698}
699
b66c60dd
RC		 700/* convert path to an UEFI style path (ie. DOS style backslashes and utf16) */
701static void path_to_uefi(u16 *uefi, const char *path)
702{
703 while (*path) {
704 char c = *(path++);
705 if (c == '/')
706 c = '\\';
707 *(uefi++) = c;
708 }
709 *uefi = '\0';
710}
711
712/*
713 * If desc is NULL, this creates a path with only the file component,
714 * otherwise it creates a full path with both device and file components
715 */
716struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part,
717 const char *path)
718{
719 struct efi_device_path_file_path *fp;
720 void *buf, *start;
721 unsigned dpsize = 0, fpsize;
722
723 if (desc)
724 dpsize = dp_part_size(desc, part);
725
726 fpsize = sizeof(struct efi_device_path) + 2 * (strlen(path) + 1);
727 dpsize += fpsize;
728
729 start = buf = dp_alloc(dpsize + sizeof(END));
04298686
HS		 730 if (!buf)
731 return NULL;
b66c60dd
RC		 732
733 if (desc)
734 buf = dp_part_fill(buf, desc, part);
735
736 /* add file-path: */
737 fp = buf;
738 fp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
739 fp->dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
740 fp->dp.length = fpsize;
741 path_to_uefi(fp->str, path);
742 buf += fpsize;
743
744 *((struct efi_device_path *)buf) = END;
745
746 return start;
747}
748
3b3ea2c5 749#ifdef CONFIG_CMD_NET
b66c60dd
RC		 750struct efi_device_path *efi_dp_from_eth(void)
751{
752 struct efi_device_path_mac_addr *ndp;
753 void *buf, *start;
754 unsigned dpsize = 0;
755
756 assert(eth_get_dev());
757
758#ifdef CONFIG_DM_ETH
759 dpsize += dp_size(eth_get_dev());
760#else
761 dpsize += sizeof(ROOT);
762#endif
763 dpsize += sizeof(*ndp);
764
765 start = buf = dp_alloc(dpsize + sizeof(END));
04298686
HS		 766 if (!buf)
767 return NULL;
b66c60dd
RC		 768
769#ifdef CONFIG_DM_ETH
770 buf = dp_fill(buf, eth_get_dev());
771#else
772 memcpy(buf, &ROOT, sizeof(ROOT));
773 buf += sizeof(ROOT);
774#endif
775
776 ndp = buf;
777 ndp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
778 ndp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR;
779 ndp->dp.length = sizeof(*ndp);
780 memcpy(ndp->mac.addr, eth_get_ethaddr(), ARP_HLEN);
781 buf = &ndp[1];
782
783 *((struct efi_device_path *)buf) = END;
784
785 return start;
786}
787#endif
788
bf19273e
RC		 789/* Construct a device-path for memory-mapped image */
790struct efi_device_path *efi_dp_from_mem(uint32_t memory_type,
791 uint64_t start_address,
792 uint64_t end_address)
793{
794 struct efi_device_path_memory *mdp;
795 void *buf, *start;
796
797 start = buf = dp_alloc(sizeof(*mdp) + sizeof(END));
04298686
HS		 798 if (!buf)
799 return NULL;
bf19273e
RC		 800
801 mdp = buf;
802 mdp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
803 mdp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MEMORY;
804 mdp->dp.length = sizeof(*mdp);
805 mdp->memory_type = memory_type;
806 mdp->start_address = start_address;
807 mdp->end_address = end_address;
808 buf = &mdp[1];
809
810 *((struct efi_device_path *)buf) = END;
811
812 return start;
813}
814
b66c60dd
RC		 815/*
816 * Helper to split a full device path (containing both device and file
817 * parts) into it's constituent parts.
818 */
04298686
HS		 819efi_status_t efi_dp_split_file_path(struct efi_device_path *full_path,
820 struct efi_device_path **device_path,
821 struct efi_device_path **file_path)
b66c60dd
RC		 822{
823 struct efi_device_path *p, *dp, *fp;
824
04298686
HS		 825 *device_path = NULL;
826 *file_path = NULL;
b66c60dd 827 dp = efi_dp_dup(full_path);
04298686
HS		 828 if (!dp)
829 return EFI_OUT_OF_RESOURCES;
b66c60dd 830 p = dp;
04298686 831 while (!EFI_DP_TYPE(p, MEDIA_DEVICE, FILE_PATH)) {
b66c60dd 832 p = efi_dp_next(p);
04298686
HS		 833 if (!p)
834 return EFI_OUT_OF_RESOURCES;
835 }
b66c60dd 836 fp = efi_dp_dup(p);
04298686
HS		 837 if (!fp)
838 return EFI_OUT_OF_RESOURCES;
b66c60dd
RC		 839 p->type = DEVICE_PATH_TYPE_END;
840 p->sub_type = DEVICE_PATH_SUB_TYPE_END;
841 p->length = sizeof(*p);
842
843 *device_path = dp;
844 *file_path = fp;
04298686 845 return EFI_SUCCESS;
b66c60dd 846}
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