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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* This provides a standard way of passing information between boot phases
* (TPL -> SPL -> U-Boot proper.)
*
* A list of blobs of data, tagged with their owner. The list resides in memory
* and can be updated by SPL, U-Boot, etc.
*
* Copyright 2018 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef __BLOBLIST_H
#define __BLOBLIST_H
enum {
BLOBLIST_VERSION = 0,
BLOBLIST_MAGIC = 0xb00757a3,
BLOBLIST_ALIGN = 16,
};
enum bloblist_tag_t {
BLOBLISTT_NONE = 0,
/* Vendor-specific tags are permitted here */
BLOBLISTT_EC_HOSTEVENT, /* Chromium OS EC host-event mask */
BLOBLISTT_SPL_HANDOFF, /* Hand-off info from SPL */
BLOBLISTT_VBOOT_CTX, /* Chromium OS verified boot context */
BLOBLISTT_VBOOT_HANDOFF, /* Chromium OS internal handoff info */
};
/**
* struct bloblist_hdr - header for the bloblist
*
* This is stored at the start of the bloblist which is always on a 16-byte
* boundary. Records follow this header. The bloblist normally stays in the
* same place in memory as SPL and U-Boot execute, but it can be safely moved
* around.
*
* None of the bloblist structures contain pointers but it is possible to put
* pointers inside a bloblist record if desired. This is not encouraged,
* since it can make part of the bloblist inaccessible if the pointer is
* no-longer valid. It is better to just store all the data inside a bloblist
* record.
*
* Each bloblist record is aligned to a 16-byte boundary and follows immediately
* from the last.
*
* @version: BLOBLIST_VERSION
* @hdr_size: Size of this header, normally sizeof(struct bloblist_hdr). The
* first bloblist_rec starts at this offset from the start of the header
* @flags: Space for BLOBLISTF_... flags (none yet)
* @magic: BLOBLIST_MAGIC
* @size: Total size of all records (non-zero if valid) including this header.
* The bloblist extends for this many bytes from the start of this header.
* @alloced: Total size allocated for this bloblist. When adding new records,
* the bloblist can grow up to this size. This starts out as
* sizeof(bloblist_hdr) since we need at least that much space to store a
* valid bloblist
* @spare: Space space
* @chksum: CRC32 for the entire bloblist allocated area. Since any of the
* blobs can be altered after being created, this checksum is only valid
* when the bloblist is finalised before jumping to the next stage of boot.
* Note: @chksum is last to make it easier to exclude it from the checksum
* calculation.
*/
struct bloblist_hdr {
u32 version;
u32 hdr_size;
u32 flags;
u32 magic;
u32 size;
u32 alloced;
u32 spare;
u32 chksum;
};
/**
* struct bloblist_rec - record for the bloblist
*
* NOTE: Only exported for testing purposes. Do not use this struct.
*
* The bloblist contains a number of records each consisting of this record
* structure followed by the data contained. Each records is 16-byte aligned.
*
* @tag: Tag indicating what the record contains
* @hdr_size: Size of this header, normally sizeof(struct bloblist_rec). The
* record's data starts at this offset from the start of the record
* @size: Size of record in bytes, excluding the header size. This does not
* need to be aligned (e.g. 3 is OK).
* @spare: Spare space for other things
*/
struct bloblist_rec {
u32 tag;
u32 hdr_size;
u32 size;
u32 spare;
};
/**
* bloblist_find() - Find a blob
*
* Searches the bloblist and returns the blob with the matching tag
*
* @tag: Tag to search for (enum bloblist_tag_t)
* @size: Expected size of the blob
* @return pointer to blob if found, or NULL if not found, or a blob was found
* but it is the wrong size
*/
void *bloblist_find(uint tag, int size);
/**
* bloblist_add() - Add a new blob
*
* Add a new blob to the bloblist
*
* This should only be called if you konw there is no existing blob for a
* particular tag. It is typically safe to call in the first phase of U-Boot
* (e.g. TPL or SPL). After that, bloblist_ensure() should be used instead.
*
* @tag: Tag to add (enum bloblist_tag_t)
* @size: Size of the blob
* @return pointer to the newly added block, or NULL if there is not enough
* space for the blob
*/
void *bloblist_add(uint tag, int size);
/**
* bloblist_ensure_size() - Find or add a blob
*
* Find an existing blob, or add a new one if not found
*
* @tag: Tag to add (enum bloblist_tag_t)
* @size: Size of the blob
* @blobp: Returns a pointer to blob on success
* @return 0 if OK, -ENOSPC if it is missing and could not be added due to lack
* of space, or -ESPIPE it exists but has the wrong size
*/
int bloblist_ensure_size(uint tag, int size, void **blobp);
/**
* bloblist_ensure() - Find or add a blob
*
* Find an existing blob, or add a new one if not found
*
* @tag: Tag to add (enum bloblist_tag_t)
* @size: Size of the blob
* @return pointer to blob, or NULL if it is missing and could not be added due
* to lack of space, or it exists but has the wrong size
*/
void *bloblist_ensure(uint tag, int size);
/**
* bloblist_new() - Create a new, empty bloblist of a given size
*
* @addr: Address of bloblist
* @size: Initial size for bloblist
* @flags: Flags to use for bloblist
* @return 0 if OK, -EFAULT if addr is not aligned correctly, -ENOSPC is the
* area is not large enough
*/
int bloblist_new(ulong addr, uint size, uint flags);
/**
* bloblist_check() - Check if a bloblist exists
*
* @addr: Address of bloblist
* @size: Expected size of blobsize, or 0 to detect the size
* @return 0 if OK, -ENOENT if the magic number doesn't match (indicating that
* there problem is no bloblist at the given address), -EPROTONOSUPPORT
* if the version does not match, -EIO if the checksum does not match,
* -EFBIG if the expected size does not match the detected size
*/
int bloblist_check(ulong addr, uint size);
/**
* bloblist_finish() - Set up the bloblist for the next U-Boot part
*
* This sets the correct checksum for the bloblist. This ensures that the
* bloblist will be detected correctly by the next phase of U-Boot.
*
* @return 0
*/
int bloblist_finish(void);
/**
* bloblist_init() - Init the bloblist system with a single bloblist
*
* This uses CONFIG_BLOBLIST_ADDR and CONFIG_BLOBLIST_SIZE to set up a bloblist
* for use by U-Boot.
*/
int bloblist_init(void);
#endif /* __BLOBLIST_H */
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