Make probe_cores deal with an unconfigured FPGA (and come back later).

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.

1 files changed, 2 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index b6597e1..190466b 100644
--- a/Makefile
+++ b/Makefile
@@ -30,6 +30,7 @@
 # Number of static hash and HMAC state blocks to allocate.
 # Numbers pulled out of a hat, just testing.
 
+STATIC_CORE_STATE_BLOCKS = 32
 STATIC_HASH_STATE_BLOCKS = 10
 STATIC_HMAC_STATE_BLOCKS = 4
 STATIC_PKEY_STATE_BLOCKS = 6
@@ -185,6 +186,7 @@ LIBTFM_BLD	?= ${LIBTFM_SRC}
 # directory.
 
 CFLAGS		+= -g3 -Wall -std=c99 -Wno-strict-aliasing
+CFLAGS		+= -DHAL_STATIC_CORE_STATE_BLOCKS=${STATIC_CORE_STATE_BLOCKS}
 CFLAGS		+= -DHAL_STATIC_HASH_STATE_BLOCKS=${STATIC_HASH_STATE_BLOCKS}
 CFLAGS		+= -DHAL_STATIC_HMAC_STATE_BLOCKS=${STATIC_HMAC_STATE_BLOCKS}
 CFLAGS		+= -DHAL_STATIC_PKEY_STATE_BLOCKS=${STATIC_PKEY_STATE_BLOCKS}