Cheri-research/Toooba
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849d5c57f8f0b56c00a8ee207f3722bdd51a2c9c
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408 Commits

Author SHA1 Message Date
jon
849d5c57f8 Fix condition where Queue can remain "empty" when there were outstanding 
indices due to the head-1 element happening to match new requests.
This leads to "remove" when empty, leading to being "almostFull" when
there are no outstanding users that will remove anything.
 2021-07-07 11:34:29 +01:00
jon
994321e527 Potential fix for lockup condition where the (undefined) bits of 
instruction returned for an invalid fetch (that is, with a valid cause)
indicate a 2-fragment instruction but where a second fragment is not
available.
 2021-07-07 11:34:29 +01:00
Franz Fuchs
db6a91e0fd mad Maps flush on reset 2021-07-06 15:19:37 +01:00
jon
b48a161fda Experimentally remove repeated write of rg_m_halt_req register. 2021-06-25 17:31:10 +01:00
Peter Rugg
4a50ae5bc8 Fix some misplaced ifdefs 2021-06-14 15:13:35 +01:00
Franz Fuchs
2572fdceba Added documentation for rename counter and removed unnecessary display messages 2021-06-08 15:03:12 +01:00
Franz Fuchs
914eb17550 Added microarchitectural counter for renamed instructions 
This counter is used for the SBC Condition 1 verification
 2021-06-08 13:18:57 +01:00
jon
4ae9f5346c Merge branch 'CHERI' of https://github.com/CTSRD-CHERI/Toooba into CHERI 2021-06-01 15:18:29 +01:00
jon
d7a492b48f Move to Flute standard placement for Tag Cache events, which is just the 
raw order from the CacheCore events.
 2021-06-01 15:17:25 +01:00
Peter Rugg
10f0807a9b Fix arbitration for non-power-of-two numbers of sources 2021-05-28 14:37:24 +01:00
Peter Rugg
bf911326e3 Fix some arbitration bugs 2021-05-28 12:36:06 +01:00
Jessica Clarke
46b1519cb0 mkXBar: Simplify as fallback case handles priority case correctly 
The first element in the vector will be srcRR[dst], so the special case
is unnecessary.
 2021-05-28 02:57:12 +01:00
Jessica Clarke
afd636a0f5 mkXBar: Fix bias towards earlier sources 
In the case where the prioritised round-robin source does not have a
request, this was always picking the earliest source that had one, which
means if some sources are making more requests than others (e.g. there
is lots of D$ churn but the I$ has a high hit rate) then, whilst the
cycles where srcRR[dst] prioritises a source that is making requests are
fair, the cycles where it prioritises a source that is not making
requests is not fair, since then the earlier sources will be
prioritised. Instead, make the fallback priority similarly dynamic so we
cycle through the order we look at the sources in.
 2021-05-28 02:32:04 +01:00
Peter Rugg
f909d886c9 Add a copyright 2021-05-27 14:45:15 +01:00
Peter Rugg
1b5f4ee9e0 Add capability-aware compressed decoding 2021-05-26 16:25:55 +01:00
Peter Rugg
88751cccba Remove hardcoded field encodings for cap loads and stores 2021-05-26 16:25:55 +01:00
Peter Rugg
913d14406e Add explicit PCC and cap JALRs 2021-05-26 16:24:41 +01:00
Peter Rugg
6450d9c33c Make JAL and JALR mode-dependent 2021-05-26 16:24:41 +01:00
Peter Rugg
657124671c Support amoswap.c 2021-05-13 23:15:25 +01:00
Peter Rugg
abc70134b1 Don't take load cap page faults if the authorising cap doesn't have load cap 2021-05-13 23:15:25 +01:00
Franz Fuchs
d78a2799d3 Fixed small mistake pointed out by Peter(pdr32) 2021-05-12 10:46:07 +01:00
Franz Fuchs
fcea3a1f4e included suggestions from Peter (pdr32) 2021-05-11 19:28:49 +01:00
Franz Fuchs
f6bd0b0e1b first attempts to fix inhibit mismatch 2021-05-11 14:13:02 +01:00
Peter Rugg
0a7e77230e Style improvements (suggested by jrtc27) 2021-05-05 13:32:07 +01:00
Peter Rugg
7e77b2314b Clarify precedence in VM permission check 2021-05-05 13:32:07 +01:00
Peter Rugg
e7258f0f22 Plumb through info on whether a load is capWidth to the TLB 2021-05-05 13:32:07 +01:00
jon
b8d86df2d0 Guard Meltdown_CF protection (such as it is) with ifdef rather than just 
comment it out.
 2021-05-04 11:29:36 +01:00
jon
2dccf1b557 Add (not-enabled-by-defaul) Meltdown-CF fix which resolves CUnseal, but not any 
of the ones that require a bounds-check.
This isn't enabled by default so that we can evaluate the seriousness of
the vulnerabilities.
 2021-04-29 17:46:39 +01:00
Peter Rugg
48e22af43e Factor out PTE cap invalid check 2021-04-29 16:02:30 +01:00
Peter Rugg
005ba1bd6f Add LoadCapPageFault exception cases 2021-04-29 16:02:30 +01:00
Peter Rugg
1eef5d2979 Still advance the DII stream on instruction fetch PTE fault (with jrtc27) 2021-04-29 16:02:30 +01:00
Peter Rugg
3b07a2a17c Add revocation 3.0 bits 2021-04-29 16:02:30 +01:00
Nathaniel Filardo
55da2986af Set mtval for excStoreCapPageFault-s correctly 
These were previously defaulting to 0, deeply confusing the kernel.
 2021-04-26 02:07:10 +01:00
jon
7cefaacb86 Remove wayward disabling of consistency flush case for the weak memory 
model.
 2021-04-21 10:44:31 +01:00
jon
86afb7e68e Add counter for LL writebacks (in the ST_MISS field). 2021-04-12 16:21:58 +01:00
jon
2c41fcd7fb Fix bug and improve expression by using Int. 2021-04-12 12:48:49 +01:00
jon
4776bc0a11 Double-train on killing a load (still decrement by one on success). 
This combo got the best performance overall (I tested triple and
quadruple training).
 2021-04-12 06:34:16 +01:00
jon
8e3fd534f9 Do negative training when we encounter a load that has previously been 
killed, but was not killed this time.
 2021-04-10 08:47:05 +01:00
jon
aa9e57ce10 Fix bug so that we actually start at minBound. 
(Map defaults to unpack(0), so for an Int, our first updateFunc will add
one to zero and it won't be much different than before.)
 2021-04-10 07:54:39 +01:00
jon
6b871c0442 Use a saturating add before being conservative with issuing loads. 2021-04-09 16:21:55 +01:00
Peter Rugg
fcea5365f6 Initial implementation CLoadTags 
This currently just loads in the data on cache miss, so won't help to reduce DRAM overhead, but will be forwards compatible and save on instructions in the revoker loop.
 2021-04-08 17:08:15 +01:00
Peter Rugg
b232272ad1 Treat CCSeal with an out-of-bounds capability as a move 
See 2d7ae22c0a for corresponding Sail change

This is not the nicest approach for area, but integrating with the existing bounds check would delay the result a cycle, and incur additional complexity.
 2021-04-08 13:08:46 +01:00
jon
12ac14c1ca Move to config registers here as this affects scheduling. 2021-04-07 17:47:49 +01:00
Franz Fuchs
ad044689cb added some of the performance counters in the L2 TLB 
- count L2 TLB accesses
- count L2 TLB misses
- count L2 TLB flushes
 2021-04-01 16:18:18 +01:00
Franz Fuchs
6e157fff5a Small improvement of BTB changes made by Jon and myself 2021-04-01 09:08:47 +01:00
jon
c17eb9e7c1 Finish propagating BTB name change from previous commit. 2021-04-01 09:04:31 +01:00
jon
0701dea9a9 Preserve name for verilog so component.xml doesn't have to be fixed. 2021-04-01 07:08:46 +01:00
Franz Fuchs
4b531fac46 Made the hash size in the BTB configurable 
The current configuration is a tag of 16 bits width
 2021-03-31 17:46:27 +01:00
jon
84271b2712 Changes to build (and run?) with TSO_MM. 2021-03-29 12:03:27 +01:00
jon
5e687a972a Slight cleanups from review with Alexandre. 2021-03-24 12:21:00 +00:00