1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2017 Rob Clark
10 #include <efi_loader.h>
15 /* GUID for file system information */
16 const efi_guid_t efi_file_system_info_guid = EFI_FILE_SYSTEM_INFO_GUID;
19 struct efi_simple_file_system_protocol base;
20 struct efi_device_path *dp;
21 struct blk_desc *desc;
24 #define to_fs(x) container_of(x, struct file_system, base)
27 struct efi_file_handle base;
28 struct file_system *fs;
29 loff_t offset; /* current file position/cursor */
32 /* for reading a directory: */
33 struct fs_dir_stream *dirs;
34 struct fs_dirent *dent;
38 #define to_fh(x) container_of(x, struct file_handle, base)
40 static const struct efi_file_handle efi_file_handle_protocol;
42 static char *basename(struct file_handle *fh)
44 char *s = strrchr(fh->path, '/');
50 static int set_blk_dev(struct file_handle *fh)
52 return fs_set_blk_dev_with_part(fh->fs->desc, fh->fs->part);
56 * is_dir() - check if file handle points to directory
58 * We assume that set_blk_dev(fh) has been called already.
61 * Return: true if file handle points to a directory
63 static int is_dir(struct file_handle *fh)
65 struct fs_dir_stream *dirs;
67 dirs = fs_opendir(fh->path);
77 * Normalize a path which may include either back or fwd slashes,
78 * double slashes, . or .. entries in the path, etc.
80 static int sanitize_path(char *path)
84 /* backslash to slash: */
86 while ((p = strchr(p, '\\')))
89 /* handle double-slashes: */
91 while ((p = strstr(p, "//"))) {
93 memmove(p, src, strlen(src) + 1);
96 /* handle extra /.'s */
98 while ((p = strstr(p, "/."))) {
100 * You'd be tempted to do this *after* handling ".."s
101 * below to avoid having to check if "/." is start of
102 * a "/..", but that won't have the correct results..
103 * for example, "/foo/./../bar" would get resolved to
104 * "/foo/bar" if you did these two passes in the other
112 memmove(p, src, strlen(src) + 1);
115 /* handle extra /..'s: */
117 while ((p = strstr(p, "/.."))) {
122 /* find beginning of previous path entry: */
131 memmove(p, src, strlen(src) + 1);
138 * file_open() - open a file handle
141 * @parent: directory relative to which the file is to be opened
142 * @file_name: path of the file to be opened. '\', '.', or '..' may
143 * be used as modifiers. A leading backslash indicates an
145 * @mode: bit mask indicating the access mode (read, write,
147 * @attributes: attributes for newly created file
148 * Returns: handle to the opened file or NULL
150 static struct efi_file_handle *file_open(struct file_system *fs,
151 struct file_handle *parent, u16 *file_name, u64 mode,
154 struct file_handle *fh;
155 char f0[MAX_UTF8_PER_UTF16] = {0};
160 utf16_to_utf8((u8 *)f0, file_name, 1);
161 flen = u16_strlen(file_name);
164 /* we could have a parent, but also an absolute path: */
168 plen = strlen(parent->path) + 1;
171 /* +2 is for null and '/' */
172 fh = calloc(1, sizeof(*fh) + plen + (flen * MAX_UTF8_PER_UTF16) + 2);
174 fh->base = efi_file_handle_protocol;
181 strcpy(p, parent->path);
186 utf16_to_utf8((u8 *)p, file_name, flen);
188 if (sanitize_path(fh->path))
191 /* check if file exists: */
195 if ((mode & EFI_FILE_MODE_CREATE) &&
196 (attributes & EFI_FILE_DIRECTORY)) {
197 if (fs_mkdir(fh->path))
199 } else if (!((mode & EFI_FILE_MODE_CREATE) ||
200 fs_exists(fh->path)))
203 /* fs_exists() calls fs_close(), so open file system again */
207 /* figure out if file is a directory: */
208 fh->isdir = is_dir(fh);
211 strcpy(fh->path, "");
221 static efi_status_t EFIAPI efi_file_open(struct efi_file_handle *file,
222 struct efi_file_handle **new_handle,
223 u16 *file_name, u64 open_mode, u64 attributes)
225 struct file_handle *fh = to_fh(file);
228 EFI_ENTRY("%p, %p, \"%ls\", %llx, %llu", file, new_handle,
229 file_name, open_mode, attributes);
231 /* Check parameters */
232 if (!file || !new_handle || !file_name) {
233 ret = EFI_INVALID_PARAMETER;
236 if (open_mode != EFI_FILE_MODE_READ &&
237 open_mode != (EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE) &&
238 open_mode != (EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE |
239 EFI_FILE_MODE_CREATE)) {
240 ret = EFI_INVALID_PARAMETER;
244 * The UEFI spec requires that attributes are only set in create mode.
245 * The SCT does not care about this and sets EFI_FILE_DIRECTORY in
246 * read mode. EDK2 does not check that attributes are zero if not in
249 * So here we only check attributes in create mode and do not check
250 * that they are zero otherwise.
252 if ((open_mode & EFI_FILE_MODE_CREATE) &&
253 (attributes & (EFI_FILE_READ_ONLY | ~EFI_FILE_VALID_ATTR))) {
254 ret = EFI_INVALID_PARAMETER;
259 *new_handle = file_open(fh->fs, fh, file_name, open_mode, attributes);
261 EFI_PRINT("file handle %p\n", *new_handle);
267 return EFI_EXIT(ret);
270 static efi_status_t file_close(struct file_handle *fh)
272 fs_closedir(fh->dirs);
277 static efi_status_t EFIAPI efi_file_close(struct efi_file_handle *file)
279 struct file_handle *fh = to_fh(file);
280 EFI_ENTRY("%p", file);
281 return EFI_EXIT(file_close(fh));
284 static efi_status_t EFIAPI efi_file_delete(struct efi_file_handle *file)
286 struct file_handle *fh = to_fh(file);
287 efi_status_t ret = EFI_SUCCESS;
289 EFI_ENTRY("%p", file);
291 if (set_blk_dev(fh)) {
292 ret = EFI_DEVICE_ERROR;
296 if (fs_unlink(fh->path))
297 ret = EFI_DEVICE_ERROR;
301 return EFI_EXIT(ret);
304 static efi_status_t file_read(struct file_handle *fh, u64 *buffer_size,
309 if (fs_read(fh->path, map_to_sysmem(buffer), fh->offset,
310 *buffer_size, &actread))
311 return EFI_DEVICE_ERROR;
313 *buffer_size = actread;
314 fh->offset += actread;
319 static efi_status_t dir_read(struct file_handle *fh, u64 *buffer_size,
322 struct efi_file_info *info = buffer;
323 struct fs_dirent *dent;
324 unsigned int required_size;
327 assert(fh->offset == 0);
328 fh->dirs = fs_opendir(fh->path);
330 return EFI_DEVICE_ERROR;
334 * So this is a bit awkward. Since fs layer is stateful and we
335 * can't rewind an entry, in the EFI_BUFFER_TOO_SMALL case below
336 * we might have to return without consuming the dent.. so we
337 * have to stash it for next call.
343 dent = fs_readdir(fh->dirs);
348 /* no more files in directory: */
349 /* workaround shim.efi bug/quirk.. as find_boot_csv()
350 * loops through directory contents, it initially calls
351 * read w/ zero length buffer to find out how much mem
352 * to allocate for the EFI_FILE_INFO, then allocates,
353 * and then calls a 2nd time. If we return size of
354 * zero the first time, it happily passes that to
355 * AllocateZeroPool(), and when that returns NULL it
356 * thinks it is EFI_OUT_OF_RESOURCES. So on first
357 * call return a non-zero size:
359 if (*buffer_size == 0)
360 *buffer_size = sizeof(*info);
366 /* check buffer size: */
367 required_size = sizeof(*info) + 2 * (strlen(dent->name) + 1);
368 if (*buffer_size < required_size) {
369 *buffer_size = required_size;
371 return EFI_BUFFER_TOO_SMALL;
374 *buffer_size = required_size;
375 memset(info, 0, required_size);
377 info->size = required_size;
378 info->file_size = dent->size;
379 info->physical_size = dent->size;
381 if (dent->type == FS_DT_DIR)
382 info->attribute |= EFI_FILE_DIRECTORY;
384 ascii2unicode(info->file_name, dent->name);
391 static efi_status_t EFIAPI efi_file_read(struct efi_file_handle *file,
392 efi_uintn_t *buffer_size, void *buffer)
394 struct file_handle *fh = to_fh(file);
395 efi_status_t ret = EFI_SUCCESS;
398 EFI_ENTRY("%p, %p, %p", file, buffer_size, buffer);
400 if (!buffer_size || !buffer) {
401 ret = EFI_INVALID_PARAMETER;
405 if (set_blk_dev(fh)) {
406 ret = EFI_DEVICE_ERROR;
412 ret = dir_read(fh, &bs, buffer);
414 ret = file_read(fh, &bs, buffer);
418 *buffer_size = SIZE_MAX;
421 return EFI_EXIT(ret);
424 static efi_status_t EFIAPI efi_file_write(struct efi_file_handle *file,
425 efi_uintn_t *buffer_size,
428 struct file_handle *fh = to_fh(file);
429 efi_status_t ret = EFI_SUCCESS;
432 EFI_ENTRY("%p, %p, %p", file, buffer_size, buffer);
434 if (set_blk_dev(fh)) {
435 ret = EFI_DEVICE_ERROR;
439 if (fs_write(fh->path, map_to_sysmem(buffer), fh->offset, *buffer_size,
441 ret = EFI_DEVICE_ERROR;
445 *buffer_size = actwrite;
446 fh->offset += actwrite;
449 return EFI_EXIT(ret);
453 * efi_file_getpos() - get current position in file
455 * This function implements the GetPosition service of the EFI file protocol.
456 * See the UEFI spec for details.
459 * @pos: pointer to file position
460 * Return: status code
462 static efi_status_t EFIAPI efi_file_getpos(struct efi_file_handle *file,
465 efi_status_t ret = EFI_SUCCESS;
466 struct file_handle *fh = to_fh(file);
468 EFI_ENTRY("%p, %p", file, pos);
471 ret = EFI_UNSUPPORTED;
477 return EFI_EXIT(ret);
481 * efi_file_setpos() - set current position in file
483 * This function implements the SetPosition service of the EFI file protocol.
484 * See the UEFI spec for details.
487 * @pos: new file position
488 * Return: status code
490 static efi_status_t EFIAPI efi_file_setpos(struct efi_file_handle *file,
493 struct file_handle *fh = to_fh(file);
494 efi_status_t ret = EFI_SUCCESS;
496 EFI_ENTRY("%p, %llu", file, pos);
500 ret = EFI_UNSUPPORTED;
503 fs_closedir(fh->dirs);
510 if (set_blk_dev(fh)) {
511 ret = EFI_DEVICE_ERROR;
515 if (fs_size(fh->path, &file_size)) {
516 ret = EFI_DEVICE_ERROR;
526 return EFI_EXIT(ret);
529 static efi_status_t EFIAPI efi_file_getinfo(struct efi_file_handle *file,
530 const efi_guid_t *info_type,
531 efi_uintn_t *buffer_size,
534 struct file_handle *fh = to_fh(file);
535 efi_status_t ret = EFI_SUCCESS;
537 EFI_ENTRY("%p, %pUl, %p, %p", file, info_type, buffer_size, buffer);
539 if (!guidcmp(info_type, &efi_file_info_guid)) {
540 struct efi_file_info *info = buffer;
541 char *filename = basename(fh);
542 unsigned int required_size;
545 /* check buffer size: */
546 required_size = sizeof(*info) + 2 * (strlen(filename) + 1);
547 if (*buffer_size < required_size) {
548 *buffer_size = required_size;
549 ret = EFI_BUFFER_TOO_SMALL;
553 if (set_blk_dev(fh)) {
554 ret = EFI_DEVICE_ERROR;
558 if (fs_size(fh->path, &file_size)) {
559 ret = EFI_DEVICE_ERROR;
563 memset(info, 0, required_size);
565 info->size = required_size;
566 info->file_size = file_size;
567 info->physical_size = file_size;
570 info->attribute |= EFI_FILE_DIRECTORY;
572 ascii2unicode(info->file_name, filename);
573 } else if (!guidcmp(info_type, &efi_file_system_info_guid)) {
574 struct efi_file_system_info *info = buffer;
575 disk_partition_t part;
576 efi_uintn_t required_size;
579 if (fh->fs->part >= 1)
580 r = part_get_info(fh->fs->desc, fh->fs->part, &part);
582 r = part_get_info_whole_disk(fh->fs->desc, &part);
584 ret = EFI_DEVICE_ERROR;
587 required_size = sizeof(info) + 2 *
588 (strlen((const char *)part.name) + 1);
589 if (*buffer_size < required_size) {
590 *buffer_size = required_size;
591 ret = EFI_BUFFER_TOO_SMALL;
595 memset(info, 0, required_size);
597 info->size = required_size;
598 info->read_only = true;
599 info->volume_size = part.size * part.blksz;
600 info->free_space = 0;
601 info->block_size = part.blksz;
603 * TODO: The volume label is not available in U-Boot.
604 * Use the partition name as substitute.
606 ascii2unicode((u16 *)info->volume_label,
607 (const char *)part.name);
609 ret = EFI_UNSUPPORTED;
613 return EFI_EXIT(ret);
616 static efi_status_t EFIAPI efi_file_setinfo(struct efi_file_handle *file,
617 const efi_guid_t *info_type,
618 efi_uintn_t buffer_size,
621 EFI_ENTRY("%p, %p, %zu, %p", file, info_type, buffer_size, buffer);
623 return EFI_EXIT(EFI_UNSUPPORTED);
626 static efi_status_t EFIAPI efi_file_flush(struct efi_file_handle *file)
628 EFI_ENTRY("%p", file);
629 return EFI_EXIT(EFI_SUCCESS);
632 static const struct efi_file_handle efi_file_handle_protocol = {
634 * TODO: We currently only support EFI file protocol revision 0x00010000
635 * while UEFI specs 2.4 - 2.7 prescribe revision 0x00020000.
637 .rev = EFI_FILE_PROTOCOL_REVISION,
638 .open = efi_file_open,
639 .close = efi_file_close,
640 .delete = efi_file_delete,
641 .read = efi_file_read,
642 .write = efi_file_write,
643 .getpos = efi_file_getpos,
644 .setpos = efi_file_setpos,
645 .getinfo = efi_file_getinfo,
646 .setinfo = efi_file_setinfo,
647 .flush = efi_file_flush,
651 * efi_file_from_path() - open file via device path
654 * @return: EFI_FILE_PROTOCOL for the file or NULL
656 struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp)
658 struct efi_simple_file_system_protocol *v;
659 struct efi_file_handle *f;
662 v = efi_fs_from_path(fp);
666 EFI_CALL(ret = v->open_volume(v, &f));
667 if (ret != EFI_SUCCESS)
670 /* Skip over device-path nodes before the file path. */
671 while (fp && !EFI_DP_TYPE(fp, MEDIA_DEVICE, FILE_PATH))
672 fp = efi_dp_next(fp);
675 * Step through the nodes of the directory path until the actual file
676 * node is reached which is the final node in the device path.
679 struct efi_device_path_file_path *fdp =
680 container_of(fp, struct efi_device_path_file_path, dp);
681 struct efi_file_handle *f2;
683 if (!EFI_DP_TYPE(fp, MEDIA_DEVICE, FILE_PATH)) {
684 printf("bad file path!\n");
689 EFI_CALL(ret = f->open(f, &f2, fdp->str,
690 EFI_FILE_MODE_READ, 0));
691 if (ret != EFI_SUCCESS)
694 fp = efi_dp_next(fp);
696 EFI_CALL(f->close(f));
703 static efi_status_t EFIAPI
704 efi_open_volume(struct efi_simple_file_system_protocol *this,
705 struct efi_file_handle **root)
707 struct file_system *fs = to_fs(this);
709 EFI_ENTRY("%p, %p", this, root);
711 *root = file_open(fs, NULL, NULL, 0, 0);
713 return EFI_EXIT(EFI_SUCCESS);
716 struct efi_simple_file_system_protocol *
717 efi_simple_file_system(struct blk_desc *desc, int part,
718 struct efi_device_path *dp)
720 struct file_system *fs;
722 fs = calloc(1, sizeof(*fs));
723 fs->base.rev = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION;
724 fs->base.open_volume = efi_open_volume;