decompressor: Add CBFS_VERIFICATION support

CBFS_VERIFICATION requires the CBFS metadata hash anchor to be linked
into an uncompressed stage, but for platforms using COMPRESS_BOOTBLOCK,
this is only the decompressor stage. The first CBFS accesses are made in
the bootblock stage after decompression, so if we want to make
CBFS_VERIFICATION work on those platforms, we have to pass the metadata
hash anchor from the decompressor into the bootblock. This patch does
just that. (Note that this relies on the decompressor data remaining
valid in memory for as long as the metadata hash anchor is needed. This
is always true even for OVERLAP_DECOMPRESSOR_ROMSTAGE() situations
because the FMAP and CBFS metadata necessarily need to have finished
verification before a new stage could be loaded.)

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I2e6d7384cfb8339a24369eb6c01fc12f911c974e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52085
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/include/bootblock_common.h b/src/include/bootblock_common.h
index da627d23d46a..fccd23524d2b 100644
--- a/src/include/bootblock_common.h
+++ b/src/include/bootblock_common.h
@@ -35,6 +35,7 @@ void bootblock_main_with_timestamp(uint64_t base_timestamp,
 /* This is the argument structure passed from decompressor to bootblock. */
 struct bootblock_arg {
 	uint64_t base_timestamp;
+	void *metadata_hash_anchor;
 	uint32_t num_timestamps;
 	struct timestamp_entry timestamps[];
 };