Use the iobuf API instead of relying on own buffer management. It
also provides consistency between marshaling and unmarshaling code
paths for propagating return values instead of overloading the values
of existing variables.
BUG=b:36598499
Change-Id: Iec0bbff1312e8e6ec616d1528db8667f32e682c9
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/19063
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
The marshaling/unmarshaling code is using integer values to represent
room left in the buffer, to be able to communicate three conditions:
positive number means there is room left in the buffer, zero means
that the exact amount of data in the buffer was unmarshaled and
negative value means that the result of the operation did not fit into
the buffer.
The implementation is wrong though, as it compares directly signed and
unsigned values, which is illegal, as signed values get promoted to
unsigned by the compiler.
This patch changes the marshaling code to use size_t for the size, and
use zero as marshaling failure indication - after all the buffer where
the data is marshaled to should definitely be large enough, and it is
reasonable to expect at least some room left in it after marshaling.
The unmarshaling situation is different: we sure want to communicate
errors to the caller, but do not want to propagate error return values
through multiple layers. This patch keeps the size value in int, but
checks if it is negative separately, before comparing with positive
values.
BRANCH=none
BUG=chrome-os-partner:50645
TEST=with the rest of the patches applied kevin successfully boots up.
Change-Id: Ibfbd1b351e35e37c8925a78d095e4e8492805bad
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: b1e862c2a650fa5f6cb25a01fe61e848a696cf17
Original-Change-Id: Ie7552b333afaff9a1234c948caf9d9a64447b2e1
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/358772
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/15610
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
TPM commands need to be serialized (marshaled) to be sent to the
device, and the responses need to be de-serialized (unmarshaled) to be
properly interpreted by upper layers.
This layer does not exist in TPM1.2 coreboot implementation, all TPM
commands used there were hardcoded as binary arrays. Availability of
the marshaling/unmarshaling layer makes it much easier to add new TPM
commands to the code.
Command and response structures used in these functions are defined in
Parts 2 and 3 of the TCG issued document
Trusted Platform Module Library
Family "2.0"
Level 00 Revision 01.16
October 30, 2014
BRANCH=none
BUG=chrome-os-partner:50645
TEST=with the rest of the patches applied it is possible to
successfully initialize firmware and kernel TPM spaces.
Change-Id: I80b3f971e347bb30ea08f820ec3dd27e1656c060
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: 0782d9d452efb732e85d1503fccfcb4bf9f69a68
Original-Change-Id: I202276ef9a43c28b5f304f901ac5b91048878b76
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/353915
Original-Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Original-Reviewed-by: Darren Krahn <dkrahn@chromium.org>
Reviewed-on: https://review.coreboot.org/15570
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@googlemail.com>
