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Various fixes extracted from the abandoned(-for-now?) reuse-cores
branch, principally:
* Change hal_core_alloc*() to support core reuse and to pick the
least-recently-used core of a particular type otherwise;
* Replace assert() and printf() calls with hal_assert() and hal_log(),
respectively. assert() is particularly useless on the HSM, since it
sends its error message into hyperspace then hangs the HSM.
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Uncoordinated attempts to allocate two modexpa7 cores leads to deadlock if
multiple clients try to do concurrent RSA signing operations.
The simplest solution (back off and retry) could theoretically lead to
resource starvation, but we haven't seen it in actual testing.
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This branch was sitting for long enough that master had been through a
cleanup pass, so beware of accidental reversions.
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Includes a few cosmetic fixes to address gcc format string warnings
and git trailing whitespace warnings.
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See, reading from an unconfigured FPGA returns all-1, while reading from
empty cores on a configured FPGA returns all-0. The consequence of this is
that the HSM was probing the FPGA once on startup, filling its core table
with 0xff, rendering the FPGA useless.
Along the way, I put the FPGA core table in static memory, rather than
malloc'ing it, because that's not so good in an embedded environment.
But I kept the linked list, because that at least tells us what to do if
HAL_STATIC_CORE_STATE_BLOCKS is 0.
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Find a suitable core, and mark it busy. Don't forget to release it as soon
as you're done. This has a knock-on effect of un-const'ing core arguments
and struct fields in a lot of places, and it moves some core checks around.
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- TRNG cores are contiguous (but they still have their own mux, so occupy
a block of 16 cores).
- Use Rob's updated libhal in my new apps.
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Compiles, not yet tested.
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