riscv/rocket-chip
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Author SHA1 Message Date
Andrew Waterman 3ed8adf032 Add early out for MUL[W] (not MULH[[S]U]) 2014-04-07 23:48:02 -07:00
Andrew Waterman 927287da34 Bypass RAS push/pop 2014-04-07 23:47:53 -07:00
Andrew Waterman f235fa0db6 Move branch resolution to M stage 2014-04-07 15:58:49 -07:00
Andrew Waterman db59fc65ab Add return address stack 2014-04-01 15:01:27 -07:00
Andrew Waterman e3b12e0b85 Make BTB more complexity-effective 
BTB entries reference a small number of unique pages, so we separate the
storage of pages from indices.  This makes much larger BTBs feasible.  It's
easy to exacerbate cycle time this way, so one-hot encoding is used as needed.
 2014-03-25 05:22:04 -07:00
Andrew Waterman 804b09c8c5 Frontend QoR tweaks 2014-03-25 05:20:24 -07:00
Andrew Waterman 6465e2df14 Make Int -> Bool conversions explicit 2014-03-24 04:36:53 -07:00
Andrew Waterman 1b030777ce Remove vestigial control signal 2014-03-24 04:36:12 -07:00
Andrew Waterman 5996418021 Fix exception behavior of fmin/fmax 2014-03-18 18:36:51 -07:00
Andrew Waterman 54cbf0c4f1 Add (unused) RV32 CSRs 2014-03-15 17:33:17 -07:00
Andrew Waterman 943d7ac80a Use LinkedHashSet/Map for simpler determinism 2014-03-15 17:31:48 -07:00
Andrew Waterman a0389645b7 New FP encoding; improved FP implementation 2014-03-11 18:58:24 -07:00
Andrew Waterman 00bc1a2293 Add fclass.{s|d} instructions 2014-03-10 16:59:24 -07:00
Andrew Waterman 9f2e16c58a Fix D$ arbiter for >2 inputs 2014-03-04 16:32:17 -08:00
Andrew Waterman fa75f6e81e Fix null pointer exception when HAS_FPU=false 2014-03-04 16:32:09 -08:00
Andrew Waterman c7110c8389 Make FPU pipeline depths configurable 2014-02-28 13:39:59 -08:00
Andrew Waterman 8e3ca609f7 Renumber uarch CSRs into custom CSR space 2014-02-14 17:40:00 -08:00
Andrew Waterman a09ff9fdc7 Revert to old AUIPC definition 2014-02-10 19:04:42 -08:00
Andrew Waterman 1456170c6d Always stall decode on RoCC -> FENCE; never stall on RoCC -> deferred AMO.RL fence 2014-02-06 12:01:49 -08:00
Andrew Waterman eca8c99f44 Ignore rocc interrupt line when no rocc is present 2014-02-06 03:06:55 -08:00
Andrew Waterman e7a726fbac Make uarch counters read-only 2014-02-06 01:48:56 -08:00
Andrew Waterman 62e9313aef Add 16 microarchitectural counters 2014-02-06 00:13:02 -08:00
Andrew Waterman febd26f505 Correct CSR privilege logic 2014-01-31 01:03:17 -08:00
Andrew Waterman 0266c1f76a Support retirement width > 1 in CSR file 2014-01-24 16:37:40 -08:00
Andrew Waterman 267394d3cc Fix CSR interlocks 2014-01-24 16:37:40 -08:00
Andrew Waterman 1f986d1c96 Branches don't care about the ALU input/function 2014-01-24 16:37:40 -08:00
Andrew Waterman a1b7774f5d Simplify handling of CAUSE register 2014-01-24 16:37:39 -08:00
Andrew Waterman a7489920ce Support CSR atomics on all CSRs, not just STATUS 2014-01-21 16:17:39 -08:00
Andrew Waterman 6ba2c1abe5 Use auto-generated CAUSE constants 2014-01-21 15:01:54 -08:00
Andrew Waterman 95de358a96 More of the same FPU fix 
some SP ops followed by DP stores were not working because they
were encoded as subnormals, not NaNs.
 2014-01-17 14:09:30 -08:00
Andrew Waterman cf38001e98 Fix fmv.s.x -> fsd 2014-01-17 03:52:35 -08:00
Andrew Waterman 57f4d89c90 Generate D$ replay_next signals correctly 2014-01-16 00:16:09 -08:00
Andrew Waterman 6ebdc4d94e Simplify store conditional failure code generation 2014-01-16 00:15:48 -08:00
Andrew Waterman 31060ea8ae Fix fubar long-latency writeback control logic 
Load miss writebacks happening at the same time as multiplication
wasn't working.  Hopefully this does it.
 2014-01-14 04:02:43 -08:00
Andrew Waterman e8486817e6 Clean up formatting (i.e. remove tabs, semicolons) 2014-01-13 21:43:56 -08:00
Andrew Waterman a50a1f7d50 Clean up multiplier/divider stuff 2014-01-13 21:37:16 -08:00
Andrew Waterman 4d236979bd Fix very far forward JALs 
We were sign-extending from the wrong bit, causing a backwards jump.
 2014-01-13 00:55:48 -08:00
Andrew Waterman c546f66404 Swap JAL/JALR encodings (again) 2014-01-13 00:54:49 -08:00
Andrew Waterman 07a91bb99a Miscellaneous cleanup 2013-12-09 19:53:14 -08:00
Andrew Waterman da3135ac9b Begin integer unit clean-up 
...to make it easier to generate the superscalar version of the core.
 2013-12-09 15:06:13 -08:00
Andrew Waterman 16d5250924 Correct FP trap behavior on FCSR 2013-12-05 04:18:04 -08:00
Andrew Waterman 5814a90472 Make DecodeLogic interface more flexible 2013-12-05 04:16:48 -08:00
Andrew Waterman 924261e2b2 Update to new privileged ISA... phew 2013-11-25 04:35:15 -08:00
Andrew Waterman 65b8340cea Mitigate D$ hit -> branch -> NPC critical path 2013-11-24 14:21:03 -08:00
Andrew Waterman 53f726008b Use Mem instead of Vec[Reg] for TLB 
QoR-neutral, improves simulation speed
 2013-11-24 14:21:02 -08:00
Andrew Waterman 12f0369e6e Simplify divide early out circuitry 2013-10-29 13:20:40 -07:00
Andrew Waterman b44dafbdca Simplify branch offset mux 2013-10-29 13:20:40 -07:00
Andrew Waterman 23f7bab4f3 Reduce FMA pipeline depths 
FMA QoR has improved enough to allow this change.
 2013-10-29 13:20:40 -07:00
Andrew Waterman ea9d0b771e remove aborts; simplify probes 2013-03-19 15:29:40 -07:00
Andrew Waterman 78868f6075 add config option to trade mul/div area for speed 2013-01-06 03:47:17 -08:00
Andrew Waterman ce9f4881d2 remove broken multiplier early out 2013-01-06 03:47:00 -08:00
Andrew Waterman 05f19b21d0 merge multiplier and divider 2012-12-12 02:22:47 -08:00
Andrew Waterman c921fc34a9 merge ALU left and right shifters 2012-12-12 02:22:34 -08:00
Andrew Waterman f5c53ce35d add ecc support to d$ data rams 
i haven't injected errors yet; it may well be incorrect.
 2012-12-11 15:58:53 -08:00
Andrew Waterman 3f59e439ef fix d$ tag raw hazard 2012-12-07 15:14:20 -08:00
Andrew Waterman e9752f1d72 pipeline host pcr access 2012-12-06 14:22:07 -08:00
Andrew Waterman 4dda38204f fix d$ reset bug 2012-12-06 03:13:22 -08:00
Andrew Waterman 290d3d226c fix AMO and store bypass bugs 
thanks, torture tester
 2012-12-06 02:07:52 -08:00
Andrew Waterman 4608660f6e torture revealed a couple bugs 
FP loads/stores with certain negative offsets could cause illegal rounding
mode traps, and x's were cropping up in situations that are benign in HW.
 2012-12-04 05:57:53 -08:00
Andrew Waterman 90cae54ac4 fix D$ read/write concurrency bug 2012-11-27 02:42:27 -08:00
Andrew Waterman 9c857b83f0 refactor PCR file 2012-11-27 01:28:06 -08:00
Andrew Waterman 64674d4d39 clean up PTW and support PADDR_BITS < VADDR_BITS 2012-11-26 20:38:45 -08:00
Andrew Waterman 608f65e716 don't wastefully read 2x the bits from D$ RAMs 2012-11-26 20:34:30 -08:00
Andrew Waterman 352bb464b5 clock gate X/M and M/W store data registers 2012-11-26 20:33:41 -08:00
Andrew Waterman 8a6ff5f9aa fix D$ writeback bug 
I swear I did this last week... perhaps I am finally losing it!
 2012-11-25 19:46:48 -08:00
Andrew Waterman de2f28193a get rid of more global constants 2012-11-25 04:24:25 -08:00
Andrew Waterman c036cdc1ea add option for 2-cycle load-use delay 2012-11-24 22:01:08 -08:00
Andrew Waterman b514c7b725 clean up I$ parity code 2012-11-24 22:00:43 -08:00
Andrew Waterman 55082e45c4 add AVec, which automatically infers element type 
should consider modifying Vec as such
 2012-11-24 18:19:28 -08:00
Andrew Waterman 2b26082132 use 1r1w ram for tags; merge tags & permissions 
setting the dirty bit now allocates an MSHR (to reuse the existing datapath)
 2012-11-20 04:09:26 -08:00
Andrew Waterman 72f94d1141 fix virtual address sign extension detection 2012-11-20 04:06:57 -08:00
Andrew Waterman 30038bda8a bypass stores to subsequent loads 
since we handle subword stores as RMW operations, this occurs frequently
 2012-11-20 01:33:32 -08:00
Andrew Waterman 29bc361d6c remove global constants; disentangle hwacha a bit 2012-11-17 17:24:08 -08:00
Andrew Waterman 5a7777fe4d clock gate integer datapath more aggressively 2012-11-17 06:48:44 -08:00
Andrew Waterman cc067026a2 pipeline D$ response -> FPU regfile 2012-11-17 06:48:11 -08:00
Andrew Waterman e68b039133 fix misc. D$ control bugs 2012-11-17 06:47:27 -08:00
Andrew Waterman dad7b71062 provide cmd/addr with cache response 2012-11-16 21:26:12 -08:00
Andrew Waterman cb8ac73045 provide store data with cache response 2012-11-16 21:15:13 -08:00
Andrew Waterman 9e010beffe fix D$ refill bug 2012-11-16 21:05:29 -08:00
Andrew Waterman 8dce89703a new D$ with better QoR and AMO pipelining 
Vector unit is disabled because nack handling needs to be fixed.
 2012-11-16 02:39:33 -08:00
Andrew Waterman a90a1790a5 improve tlb qor 2012-11-16 01:59:38 -08:00
Andrew Waterman ff8c736d94 move icache invalidate out of request bundle 2012-11-16 01:55:45 -08:00
Andrew Waterman 6d10115b19 fix D$ tag width 2012-11-15 16:46:39 -08:00
Andrew Waterman 4d1ca8ba3a remove more global consts; refactor DTLBs 
D$ now contains DTLB. provide full VAddr with initial request.
VU now has its own DTLBs.
 2012-11-06 08:13:44 -08:00
Andrew Waterman e76892f758 remove more global constants 2012-11-06 02:55:45 -08:00
Andrew Waterman c5b93798fb factor out more global constants 2012-11-05 23:52:32 -08:00
Andrew Waterman 5b20ed71be move rd=0 check into bypass logic 
before, the check was in the write enable logic, but moving it obviated
an awkward corner case for mtpcr with rd=0.
 2012-11-05 01:30:57 -08:00
Andrew Waterman 5e103054fd fix bug in quine mccluskey 2012-11-05 00:28:25 -08:00
Andrew Waterman e9eca6a95d refactor I$ config; remove Top class 2012-11-04 16:59:36 -08:00
Andrew Waterman 7380c9fe60 aggressively clock gate int and fp datapaths 2012-11-04 16:40:14 -08:00
Andrew Waterman bd2d61de03 use 8T SRAM for I$; gate clock more aggressively 2012-11-04 16:39:25 -08:00
Andrew Waterman fedee6c67d add generic error correcting codes 2012-10-30 01:03:47 -07:00
Andrew Waterman 5773cbb68a rejigger htif to use UncoreConfiguration 2012-10-18 17:26:03 -07:00
Andrew Waterman b9a2af697d turn off HAVE_VEC as it's currently broken 
the new I$/frontend needs to be integrated
 2012-10-16 07:38:19 -07:00
Andrew Waterman 0a640f2cc6 make DecodeLogic deterministic (hopefully) 2012-10-16 04:51:21 -07:00
Andrew Waterman 5821900329 don't refetch from I$ if on same 16B block 2012-10-16 02:24:38 -07:00
Andrew Waterman b955985b38 improve divider QoR 2012-10-16 02:24:38 -07:00
Andrew Waterman 197154c485 use BTB for JALR 2012-10-16 02:24:37 -07:00
Andrew Waterman fc648d13a1 remove old Mux1H; add implicit conversions 2012-10-16 02:24:37 -07:00
Andrew Waterman 661f8e635b merge I$, ITLB, BTB into Frontend 2012-10-16 02:24:37 -07:00