diff options
Diffstat (limited to 'src/commonlib')
| -rw-r--r-- | src/commonlib/bsd/include/commonlib/bsd/metadata_hash.h | 34 | ||||
| -rw-r--r-- | src/commonlib/include/commonlib/cbmem_id.h | 1 |
2 files changed, 35 insertions, 0 deletions
diff --git a/src/commonlib/bsd/include/commonlib/bsd/metadata_hash.h b/src/commonlib/bsd/include/commonlib/bsd/metadata_hash.h new file mode 100644 index 0000000000..d5e54b508e --- /dev/null +++ b/src/commonlib/bsd/include/commonlib/bsd/metadata_hash.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only */ + +#ifndef _COMMONLIB_BSD_METADATA_HASH_H_ +#define _COMMONLIB_BSD_METADATA_HASH_H_ + +#include <stdint.h> +#include <vb2_sha.h> + +/* This structure is embedded somewhere in the (uncompressed) bootblock. */ +struct metadata_hash_anchor { + uint8_t magic[8]; + struct vb2_hash cbfs_hash; + /* NOTE: This is just reserving space. sizeof(struct vb2_hash) may change between + configurations/versions and cannot be relied upon, so the FMAP hash must be placed + right after the actual data for the particular CBFS hash algorithm used ends. */ + uint8_t reserved_space_for_fmap_hash[VB2_MAX_DIGEST_SIZE]; +} __packed; + +/* Always use this function to figure out the actual location of the FMAP hash. It always uses + the same algorithm as the CBFS hash. */ +static inline uint8_t *metadata_hash_anchor_fmap_hash(struct metadata_hash_anchor *anchor) +{ + return anchor->cbfs_hash.raw + vb2_digest_size(anchor->cbfs_hash.algo); +} + +/* + * Do not use this constant anywhere else in coreboot code to ensure the bit pattern really only + * appears once in the CBFS image. The only coreboot file allowed to use this is + * src/lib/metadata_anchor.c to define the actual anchor data structure. It is defined here so + * that it can be shared with cbfstool (which may use it freely). + */ +#define DO_NOT_USE_METADATA_HASH_ANCHOR_MAGIC_DO_NOT_USE "\xadMdtHsh\x15" + +#endif /* _COMMONLIB_BSD_MASTER_HASH_H_ */ diff --git a/src/commonlib/include/commonlib/cbmem_id.h b/src/commonlib/include/commonlib/cbmem_id.h index ab7cf63843..6e24545110 100644 --- a/src/commonlib/include/commonlib/cbmem_id.h +++ b/src/commonlib/include/commonlib/cbmem_id.h @@ -25,6 +25,7 @@ #define CBMEM_ID_IGD_OPREGION 0x4f444749 #define CBMEM_ID_IMD_ROOT 0xff4017ff #define CBMEM_ID_IMD_SMALL 0x53a11439 +#define CBMEM_ID_MDATA_HASH 0x6873484D #define CBMEM_ID_MEMINFO 0x494D454D #define CBMEM_ID_MMA_DATA 0x4D4D4144 #define CBMEM_ID_MMC_STATUS 0x4d4d4353 |