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Until now, the attestation token size was limited by the size of the shared buffer between RMM and TF-A. With this change, RMM can now request the token in pieces, so they fit in the shared buffer. A new output parameter was added to the SMC call, which will return (along with the size of bytes copied into the buffer) the number of bytes of the token that remain to be retrieved. TF-A will keep an offset variable that will indicate the position in the token where the next call will retrieve bytes from. This offset will be increased on every call by adding the number number of bytes copied. If the received hash size is not 0, TF-A will reset the offset to 0 and copy from that position on. The SMC call will now return at most the size of the shared buffer in bytes on every call. Therefore, from now on, multiple SMC calls may be needed to be issued if the token size exceeds the shared buffer size. Change-Id: I591f7013d06f64e98afaf9535dbea6f815799723 Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com> |
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