1 /* SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause */
3 * This provides a standard way of passing information between boot phases
4 * (TPL -> SPL -> U-Boot proper.)
6 * It consists of a list of blobs of data, tagged with their owner / contents.
7 * The list resides in memory and can be updated by SPL, U-Boot, etc.
9 * Design goals for bloblist:
11 * 1. Small and efficient structure. This avoids UUIDs or 16-byte name fields,
12 * since a 32-bit tag provides enough space for all the tags we will even need.
13 * If UUIDs are desired, they can be added inside a particular blob.
15 * 2. Avoids use of pointers, so the structure can be relocated in memory. The
16 * data in each blob is inline, rather than using pointers.
18 * 3. Bloblist is designed to start small in TPL or SPL, when only a few things
19 * are needed, like the memory size or whether console output should be enabled.
20 * Then it can grow in U-Boot proper, e.g. to include space for ACPI tables.
22 * 4. The bloblist structure is simple enough that it can be implemented in a
23 * small amount of C code. The API does not require use of strings or UUIDs,
24 * which would add to code size. For Thumb-2 the code size needed in SPL is
25 * approximately 940 bytes (e.g. for chromebook_bob).
27 * 5. Bloblist uses 8-byte alignment internally and is designed to start on a
28 * 8-byte boundary. Its headers are 8 bytes long. It is possible to achieve
29 * larger alignment (e.g. 16 bytes) by adding a dummy header, For use in SPL and
30 * TPL the alignment can be relaxed, since it can be relocated to an aligned
31 * address in U-Boot proper.
33 * 6. Bloblist is designed to be passed to Linux as reserved memory. While linux
34 * doesn't understand the bloblist header, it can be passed the indivdual blobs.
35 * For example, ACPI tables can reside in a blob and the address of those is
36 * passed to Linux, without Linux ever being away of the existence of a
37 * bloblist. Having all the blobs contiguous in memory simplifies the
38 * reserved-memory space.
40 * 7. Bloblist tags are defined in the enum below. There is an area for
41 * project-specific stuff (e.g. U-Boot, TF-A) and vendor-specific stuff, e.g.
42 * something used only on a particular SoC. There is also a private area for
43 * temporary, local use.
45 * 8. Bloblist includes a simple checksum, so that each boot phase can update
46 * this and allow the next phase to check that all is well. While the bloblist
47 * is small, this is quite cheap to calculate. When it grows (e.g. in U-Boot\
48 * proper), the CPU is likely running faster, so it is not prohibitive. Having
49 * said that, U-Boot is often the last phase that uses bloblist, so calculating
50 * the checksum there may not be necessary.
52 * 9. It would be possible to extend bloblist to support a non-contiguous
53 * structure, e.g. by creating a blob type that points to the next bloblist.
54 * This does not seem necessary for now. It adds complexity and code. We can
55 * always just copy it.
57 * 10. Bloblist is designed for simple structures, those that can be defined by
58 * a single C struct. More complex structures should be passed in a device tree.
59 * There are some exceptions, chiefly the various binary structures that Intel
60 * is fond of creating. But device tree provides a dictionary-type format which
61 * is fairly efficient (for use in U-Boot proper and Linux at least), along with
62 * a schema and a good set of tools. New formats should be designed around
63 * device tree rather than creating new binary formats, unless they are needed
64 * early in boot (where libfdt's 3KB of overhead is too large) and are trival
65 * enough to be described by a C struct.
67 * Copyright 2018 Google, Inc
68 * Written by Simon Glass <sjg@chromium.org>
78 BLOBLIST_MAGIC = 0x4a0fb10b,
80 BLOBLIST_BLOB_ALIGN_LOG2 = 3,
81 BLOBLIST_BLOB_ALIGN = 1 << BLOBLIST_BLOB_ALIGN_LOG2,
83 BLOBLIST_ALIGN_LOG2 = 3,
84 BLOBLIST_ALIGN = 1 << BLOBLIST_ALIGN_LOG2,
87 /* Supported tags - add new ones to tag_name in bloblist.c */
92 * Standard area to allocate blobs used across firmware components, for
93 * things that are very commonly used, particularly in multiple
96 BLOBLISTT_AREA_FIRMWARE_TOP = 0x1,
98 * Devicetree for use by firmware. On some platforms this is passed to
101 BLOBLISTT_CONTROL_FDT = 1,
102 BLOBLISTT_HOB_BLOCK = 2,
103 BLOBLISTT_HOB_LIST = 3,
104 BLOBLISTT_ACPI_TABLES = 4,
105 BLOBLISTT_TPM_EVLOG = 5,
106 BLOBLISTT_TPM_CRB_BASE = 6,
108 /* Standard area to allocate blobs used across firmware components */
109 BLOBLISTT_AREA_FIRMWARE = 0x10,
110 BLOBLISTT_TPM2_TCG_LOG = 0x10, /* TPM v2 log space */
111 BLOBLISTT_TCPA_LOG = 0x11, /* TPM log space */
113 * Advanced Configuration and Power Interface Global Non-Volatile
114 * Sleeping table. This forms part of the ACPI tables passed to Linux.
116 BLOBLISTT_ACPI_GNVS = 0x12,
118 /* Standard area to allocate blobs used for Trusted Firmware */
119 BLOBLISTT_AREA_TF = 0x100,
120 BLOBLISTT_OPTEE_PAGABLE_PART = 0x100,
122 /* Other standard area to allocate blobs */
123 BLOBLISTT_AREA_OTHER = 0x200,
124 BLOBLISTT_INTEL_VBT = 0x200, /* Intel Video-BIOS table */
125 BLOBLISTT_SMBIOS_TABLES = 0x201, /* SMBIOS tables for x86 */
126 BLOBLISTT_VBOOT_CTX = 0x202, /* Chromium OS verified boot context */
129 * Tags from here are on reserved for private use within a single
130 * firmware binary (i.e. a single executable or phase of a project).
131 * These tags can be passed between binaries within a local
132 * implementation, but cannot be used in upstream code. Allocate a
133 * tag in one of the areas above if you want that.
135 * Project-specific tags are permitted here. Projects can be open source
136 * or not, but the format of the data must be fuily documented in an
137 * open source project, including all fields, bits, etc. Naming should
138 * be: BLOBLISTT_<project>_<purpose_here>
140 * Vendor-specific tags are also permitted. Projects can be open source
141 * or not, but the format of the data must be fuily documented in an
142 * open source project, including all fields, bits, etc. Naming should
143 * be BLOBLISTT_<vendor>_<purpose_here>
145 BLOBLISTT_PRIVATE_AREA = 0xfff000,
146 BLOBLISTT_U_BOOT_SPL_HANDOFF = 0xfff000, /* Hand-off info from SPL */
147 BLOBLISTT_VBE = 0xfff001, /* VBE per-phase state */
148 BLOBLISTT_U_BOOT_VIDEO = 0xfff002, /* Video info from SPL */
152 * struct bloblist_hdr - header for the bloblist
154 * This is stored at the start of the bloblist which is always on a 16-byte
155 * boundary. Records follow this header. The bloblist normally stays in the
156 * same place in memory as SPL and U-Boot execute, but it can be safely moved
159 * None of the bloblist headers themselves contain pointers but it is possible
160 * to put pointers inside a bloblist record if desired. This is not encouraged,
161 * since it can make part of the bloblist inaccessible if the pointer is
162 * no-longer valid. It is better to just store all the data inside a bloblist
165 * Each bloblist record is aligned to a 16-byte boundary and follows immediately
168 * @magic: BLOBLIST_MAGIC
169 * @version: BLOBLIST_VERSION
170 * @hdr_size: Size of this header, normally sizeof(struct bloblist_hdr). The
171 * first bloblist_rec starts at this offset from the start of the header
172 * @flags: Space for BLOBLISTF... flags (none yet)
173 * @size: Total size of the bloblist (non-zero if valid) including this header.
174 * The bloblist extends for this many bytes from the start of this header.
175 * When adding new records, the bloblist can grow up to this size.
176 * @alloced: Total size allocated so far for this bloblist. This starts out as
177 * sizeof(bloblist_hdr) since we need at least that much space to store a
179 * @spare: Spare space (for future use)
180 * @chksum: checksum for the entire bloblist allocated area. Since any of the
181 * blobs can be altered after being created, this checksum is only valid
182 * when the bloblist is finalised before jumping to the next stage of boot.
183 * This is the value needed to make all checksummed bytes sum to 0
185 struct bloblist_hdr {
198 * struct bloblist_rec - record for the bloblist
200 * The bloblist contains a number of records each consisting of this record
201 * structure followed by the data contained. Each records is 16-byte aligned.
203 * NOTE: Only exported for testing purposes. Do not use this struct.
205 * @tag_and_hdr_size: Tag indicating what the record contains (bottom 24 bits), and
206 * size of this header (top 8 bits), normally sizeof(struct bloblist_rec).
207 * The record's data starts at this offset from the start of the record
208 * @size: Size of record in bytes, excluding the header size. This does not
209 * need to be aligned (e.g. 3 is OK).
211 struct bloblist_rec {
212 u32 tag_and_hdr_size;
217 BLOBLISTR_TAG_SHIFT = 0,
218 BLOBLISTR_TAG_MASK = 0xffffffU << BLOBLISTR_TAG_SHIFT,
219 BLOBLISTR_HDR_SIZE_SHIFT = 24,
220 BLOBLISTR_HDR_SIZE_MASK = 0xffU << BLOBLISTR_HDR_SIZE_SHIFT,
222 BLOBLIST_HDR_SIZE = sizeof(struct bloblist_hdr),
223 BLOBLIST_REC_HDR_SIZE = sizeof(struct bloblist_rec),
227 * bloblist_check_magic() - return a bloblist if the magic matches
229 * @addr: Address to check
230 * Return: pointer to bloblist, if the magic matches, else NULL
232 static inline void *bloblist_check_magic(ulong addr)
238 ptr = map_sysmem(addr, 0);
239 if (*ptr != BLOBLIST_MAGIC)
246 * bloblist_find() - Find a blob
248 * Searches the bloblist and returns the blob with the matching tag
250 * @tag: Tag to search for (enum bloblist_tag_t)
251 * @size: Expected size of the blob, or 0 for any size
252 * Return: pointer to blob if found, or NULL if not found, or a blob was found
253 * but it is the wrong size
255 void *bloblist_find(uint tag, int size);
258 * bloblist_add() - Add a new blob
260 * Add a new blob to the bloblist
262 * This should only be called if you konw there is no existing blob for a
263 * particular tag. It is typically safe to call in the first phase of U-Boot
264 * (e.g. TPL or SPL). After that, bloblist_ensure() should be used instead.
266 * @tag: Tag to add (enum bloblist_tag_t)
267 * @size: Size of the blob
268 * @align_log2: Alignment of the blob (in bytes log2), 0 for default
269 * Return: pointer to the newly added block, or NULL if there is not enough
272 void *bloblist_add(uint tag, int size, int align_log2);
275 * bloblist_ensure_size() - Find or add a blob
277 * Find an existing blob, or add a new one if not found
279 * @tag: Tag to add (enum bloblist_tag_t)
280 * @size: Size of the blob
281 * @blobp: Returns a pointer to blob on success
282 * @align_log2: Alignment of the blob (in bytes log2), 0 for default
283 * Return: 0 if OK, -ENOSPC if it is missing and could not be added due to lack
284 * of space, or -ESPIPE it exists but has the wrong size
286 int bloblist_ensure_size(uint tag, int size, int align_log2, void **blobp);
289 * bloblist_ensure() - Find or add a blob
291 * Find an existing blob, or add a new one if not found
293 * @tag: Tag to add (enum bloblist_tag_t)
294 * @size: Size of the blob
295 * Return: pointer to blob, or NULL if it is missing and could not be added due
296 * to lack of space, or it exists but has the wrong size
298 void *bloblist_ensure(uint tag, int size);
301 * bloblist_ensure_size_ret() - Find or add a blob
303 * Find an existing blob, or add a new one if not found
305 * @tag: Tag to add (enum bloblist_tag_t)
306 * @sizep: Size of the blob to create; returns size of actual blob
307 * @blobp: Returns a pointer to blob on success
308 * Return: 0 if OK, -ENOSPC if it is missing and could not be added due to lack
311 int bloblist_ensure_size_ret(uint tag, int *sizep, void **blobp);
314 * bloblist_resize() - resize a blob
316 * Any blobs above this one are relocated up or down. The resized blob remains
319 * @tag: Tag to add (enum bloblist_tag_t)
320 * @new_size: New size of the blob (>0 to expand, <0 to contract)
321 * Return: 0 if OK, -ENOSPC if the bloblist does not have enough space, -ENOENT
322 * if the tag is not found
324 int bloblist_resize(uint tag, int new_size);
327 * bloblist_new() - Create a new, empty bloblist of a given size
329 * @addr: Address of bloblist
330 * @size: Initial size for bloblist
331 * @flags: Flags to use for bloblist
332 * Return: 0 if OK, -EFAULT if addr is not aligned correctly, -ENOSPC is the
333 * area is not large enough
335 int bloblist_new(ulong addr, uint size, uint flags);
338 * bloblist_check() - Check if a bloblist exists
340 * @addr: Address of bloblist
341 * @size: Expected size of blobsize, or 0 to detect the size
342 * Return: 0 if OK, -ENOENT if the magic number doesn't match (indicating that
343 * there problem is no bloblist at the given address), -EPROTONOSUPPORT
344 * if the version does not match, -EIO if the checksum does not match,
345 * -EFBIG if the expected size does not match the detected size, -ENOSPC
346 * if the size is not large enough to hold the headers
348 int bloblist_check(ulong addr, uint size);
351 * bloblist_finish() - Set up the bloblist for the next U-Boot part
353 * This sets the correct checksum for the bloblist. This ensures that the
354 * bloblist will be detected correctly by the next phase of U-Boot.
358 int bloblist_finish(void);
361 * bloblist_get_stats() - Get information about the bloblist
363 * This returns useful information about the bloblist
365 * @basep: Returns base address of bloblist
366 * @sizep: Returns the number of bytes used in the bloblist
367 * @allocedp: Returns the total space allocated to the bloblist
369 void bloblist_get_stats(ulong *basep, ulong *sizep, ulong *allocedp);
372 * bloblist_get_base() - Get the base address of the bloblist
374 * Return: base address of bloblist
376 ulong bloblist_get_base(void);
379 * bloblist_get_size() - Get the size of the bloblist
381 * Return: the size in bytes
383 ulong bloblist_get_size(void);
386 * bloblist_show_stats() - Show information about the bloblist
388 * This shows useful information about the bloblist on the console
390 void bloblist_show_stats(void);
393 * bloblist_show_list() - Show a list of blobs in the bloblist
395 * This shows a list of blobs, showing their address, size and tag.
397 void bloblist_show_list(void);
400 * bloblist_tag_name() - Get the name for a tag
403 * Return: name of tag, or "invalid" if an invalid tag is provided
405 const char *bloblist_tag_name(enum bloblist_tag_t tag);
408 * bloblist_reloc() - Relocate the bloblist and optionally resize it
410 * @to: Pointer to new bloblist location (must not overlap old location)
411 * @to_size: New size for bloblist (must be larger than from_size)
412 * @from: Pointer to bloblist to relocate
413 * @from_size: Size of bloblist to relocate
415 void bloblist_reloc(void *to, uint to_size, void *from, uint from_size);
418 * bloblist_init() - Init the bloblist system with a single bloblist
420 * This locates and sets up the blocklist for use.
422 * If CONFIG_BLOBLIST_FIXED is selected, it uses CONFIG_BLOBLIST_ADDR and
423 * CONFIG_BLOBLIST_SIZE to set up a bloblist for use by U-Boot.
425 * If CONFIG_BLOBLIST_ALLOC is selected, it allocates memory for a bloblist of
426 * size CONFIG_BLOBLIST_SIZE.
428 * If CONFIG_BLOBLIST_PASSAGE is selected, it uses the bloblist in the incoming
429 * standard passage. The size is detected automatically so CONFIG_BLOBLIST_SIZE
432 * Sets GD_FLG_BLOBLIST_READY in global_data flags on success
434 * Return: 0 if OK, -ve on error
436 int bloblist_init(void);
438 #if CONFIG_IS_ENABLED(BLOBLIST)
440 * bloblist_maybe_init() - Init the bloblist system if not already done
442 * Calls bloblist_init() if the GD_FLG_BLOBLIST_READY flag is not et
444 * Return: 0 if OK, -ve on error
446 int bloblist_maybe_init(void);
448 static inline int bloblist_maybe_init(void)
452 #endif /* BLOBLIST */
454 #endif /* __BLOBLIST_H */