There are several complexities associated with handling the crypto-agile log format from TPM2 systems on UEFI platforms. The first is that each log entry may be of variable length, necessitating parsing the log in-kernel to determine its length. The second is that the log is kept in boot services memory (which is reclaimed by the OS after ExitBootServices() is called), but ExitBootServices() may introduce additional log entries. These additional log entries are added to a separate log which should then be merged into the initial log. This patchset makes the existing support for calculating TPM events more general (in order to allow it to be used from the EFI boot stub), adds support for copying up crypto agile logs from the boot environment to the running kernel and adds support for merging the final events log into the initial events log.
