1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * This provides a standard way of passing information between boot phases
4 * (TPL -> SPL -> U-Boot proper.)
6 * A list of blobs of data, tagged with their owner. The list resides in memory
7 * and can be updated by SPL, U-Boot, etc.
9 * Copyright 2018 Google, Inc
10 * Written by Simon Glass <sjg@chromium.org>
18 BLOBLIST_MAGIC = 0xb00757a3,
25 /* Vendor-specific tags are permitted here */
26 BLOBLISTT_EC_HOSTEVENT, /* Chromium OS EC host-event mask */
27 BLOBLISTT_SPL_HANDOFF, /* Hand-off info from SPL */
28 BLOBLISTT_VBOOT_CTX, /* Chromium OS verified boot context */
29 BLOBLISTT_VBOOT_HANDOFF, /* Chromium OS internal handoff info */
31 * Advanced Configuration and Power Interface Global Non-Volatile
32 * Sleeping table. This forms part of the ACPI tables passed to Linux.
38 * struct bloblist_hdr - header for the bloblist
40 * This is stored at the start of the bloblist which is always on a 16-byte
41 * boundary. Records follow this header. The bloblist normally stays in the
42 * same place in memory as SPL and U-Boot execute, but it can be safely moved
45 * None of the bloblist structures contain pointers but it is possible to put
46 * pointers inside a bloblist record if desired. This is not encouraged,
47 * since it can make part of the bloblist inaccessible if the pointer is
48 * no-longer valid. It is better to just store all the data inside a bloblist
51 * Each bloblist record is aligned to a 16-byte boundary and follows immediately
54 * @version: BLOBLIST_VERSION
55 * @hdr_size: Size of this header, normally sizeof(struct bloblist_hdr). The
56 * first bloblist_rec starts at this offset from the start of the header
57 * @flags: Space for BLOBLISTF_... flags (none yet)
58 * @magic: BLOBLIST_MAGIC
59 * @size: Total size of all records (non-zero if valid) including this header.
60 * The bloblist extends for this many bytes from the start of this header.
61 * @alloced: Total size allocated for this bloblist. When adding new records,
62 * the bloblist can grow up to this size. This starts out as
63 * sizeof(bloblist_hdr) since we need at least that much space to store a
66 * @chksum: CRC32 for the entire bloblist allocated area. Since any of the
67 * blobs can be altered after being created, this checksum is only valid
68 * when the bloblist is finalised before jumping to the next stage of boot.
69 * Note: @chksum is last to make it easier to exclude it from the checksum
85 * struct bloblist_rec - record for the bloblist
87 * NOTE: Only exported for testing purposes. Do not use this struct.
89 * The bloblist contains a number of records each consisting of this record
90 * structure followed by the data contained. Each records is 16-byte aligned.
92 * @tag: Tag indicating what the record contains
93 * @hdr_size: Size of this header, normally sizeof(struct bloblist_rec). The
94 * record's data starts at this offset from the start of the record
95 * @size: Size of record in bytes, excluding the header size. This does not
96 * need to be aligned (e.g. 3 is OK).
97 * @spare: Spare space for other things
107 * bloblist_find() - Find a blob
109 * Searches the bloblist and returns the blob with the matching tag
111 * @tag: Tag to search for (enum bloblist_tag_t)
112 * @size: Expected size of the blob
113 * @return pointer to blob if found, or NULL if not found, or a blob was found
114 * but it is the wrong size
116 void *bloblist_find(uint tag, int size);
119 * bloblist_add() - Add a new blob
121 * Add a new blob to the bloblist
123 * This should only be called if you konw there is no existing blob for a
124 * particular tag. It is typically safe to call in the first phase of U-Boot
125 * (e.g. TPL or SPL). After that, bloblist_ensure() should be used instead.
127 * @tag: Tag to add (enum bloblist_tag_t)
128 * @size: Size of the blob
129 * @return pointer to the newly added block, or NULL if there is not enough
132 void *bloblist_add(uint tag, int size);
135 * bloblist_ensure_size() - Find or add a blob
137 * Find an existing blob, or add a new one if not found
139 * @tag: Tag to add (enum bloblist_tag_t)
140 * @size: Size of the blob
141 * @blobp: Returns a pointer to blob on success
142 * @return 0 if OK, -ENOSPC if it is missing and could not be added due to lack
143 * of space, or -ESPIPE it exists but has the wrong size
145 int bloblist_ensure_size(uint tag, int size, void **blobp);
148 * bloblist_ensure() - Find or add a blob
150 * Find an existing blob, or add a new one if not found
152 * @tag: Tag to add (enum bloblist_tag_t)
153 * @size: Size of the blob
154 * @return pointer to blob, or NULL if it is missing and could not be added due
155 * to lack of space, or it exists but has the wrong size
157 void *bloblist_ensure(uint tag, int size);
160 * bloblist_ensure_size_ret() - Find or add a blob
162 * Find an existing blob, or add a new one if not found
164 * @tag: Tag to add (enum bloblist_tag_t)
165 * @sizep: Size of the blob to create; returns size of actual blob
166 * @blobp: Returns a pointer to blob on success
167 * @return 0 if OK, -ENOSPC if it is missing and could not be added due to lack
170 int bloblist_ensure_size_ret(uint tag, int *sizep, void **blobp);
173 * bloblist_new() - Create a new, empty bloblist of a given size
175 * @addr: Address of bloblist
176 * @size: Initial size for bloblist
177 * @flags: Flags to use for bloblist
178 * @return 0 if OK, -EFAULT if addr is not aligned correctly, -ENOSPC is the
179 * area is not large enough
181 int bloblist_new(ulong addr, uint size, uint flags);
184 * bloblist_check() - Check if a bloblist exists
186 * @addr: Address of bloblist
187 * @size: Expected size of blobsize, or 0 to detect the size
188 * @return 0 if OK, -ENOENT if the magic number doesn't match (indicating that
189 * there problem is no bloblist at the given address), -EPROTONOSUPPORT
190 * if the version does not match, -EIO if the checksum does not match,
191 * -EFBIG if the expected size does not match the detected size, -ENOSPC
192 * if the size is not large enough to hold the headers
194 int bloblist_check(ulong addr, uint size);
197 * bloblist_finish() - Set up the bloblist for the next U-Boot part
199 * This sets the correct checksum for the bloblist. This ensures that the
200 * bloblist will be detected correctly by the next phase of U-Boot.
204 int bloblist_finish(void);
207 * bloblist_init() - Init the bloblist system with a single bloblist
209 * This uses CONFIG_BLOBLIST_ADDR and CONFIG_BLOBLIST_SIZE to set up a bloblist
212 int bloblist_init(void);
214 #endif /* __BLOBLIST_H */