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a960c5684c
The TPM task provides access to various cryptographic functions which
require huge stack size. Some other contexts might require to execute
these functions, but no other task in the system has enough stack.
The suggested solution is to create an alternative TPM task execution
path, where the command comes not from the communications interface
(SPI or I2C), but from another task in the system.
An interface function is created to allow a single task to pass the
command to the TPM task. The task requesting the alternative execution
path creates the command context, sends an event to the TPM task to
alert it to the presence of the command and then polls the flag
indicating that the TPM task has completed execution of the command.
BRANCH=cr50
BUG=b:67008109
TEST=tested after applying the next patch (add console command for
generating RMA auth challenge).
Change-Id: I168489a5fbb4a3e1d718198812019116738b2f61
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/699523
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly