riscv/rocket-chip
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d0c6cbba6b
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2099 Commits

Author SHA1 Message Date
Andrew Waterman
d0c6cbba6b Improve frontend branch prediction 
- Put correctness responsibility on Frontend, not IBuf, for improved
  separation of concerns.  Frontend must detect case that the BTB
  predicts a taken branch in the middle of an instruction.

- Pass BTB information down pipeline unconditionally, fixing case that
  screws up the branch history when the BTB misses and the instruction
  is misaligned.

- Remove jumpInFrontend option; it's now unconditional.

- Default to one-bit counters in the BHT.  For tiny BHTs like these, it's
  more resource efficient to have a larger index space than to have
  hysteresis.
 2017-11-09 00:00:56 -08:00
Andrew Waterman
989eeb78f9 Prevent some unnecessary pipeline replays 2017-11-06 11:04:06 -08:00
Andrew Waterman
c8bc487ab8 Use pseudo-LRU policy in BTB 
FIFO falls on its face if the working set doesn't fit in the BTB.
 2017-11-03 16:27:04 -07:00
Andrew Waterman
a2b80100e2 Make PseudoLRU policy support non-power-of-2 sizes 2017-11-01 01:47:23 -07:00
Wesley W. Terpstra
84145959e1
tilelink: fix error fragmentation from multibeat to multibeat (#1082) 
Unfortunately, dLast is not actually correct for AccessAckData.
dFragnum is 0 for all the subbeats in the multibeat=>multibeat case.
 2017-10-31 17:34:46 -07:00
Wesley W. Terpstra
8ec06151b0
interrupts: Crossing should use asynchronously reset registers (#1080) 
Otherwise you can get interrupts wedged high from a domain that has
not yet been clocked/powered up.
 2017-10-31 16:29:06 -07:00
Megan Wachs
f86489b59e
JTAG: Use sorted map for stability (#1073) 
* JTAG: Use sorted map for stability

Otherwise the generated FIRRTL/Verilog is non deterministic

* jtag : parens for clarity

* jtag: Use deterministic ListMap and sort for stability

* JTAG: use slightly clearer SortedMap (clearer to me anyway)

* jtag: whitespace cleanup
 2017-10-31 15:33:41 -07:00
Andrew Waterman
3db066303b
Fix ITIM bug overwriting I$ contents when deallocating ITIM (#1079) 
Workaround: disable interrupts and then do:

.align 3
sb x0, (t0) # t0 contains ITIM-deallocate address
fence.i
 2017-10-31 00:49:56 -07:00
Wesley W. Terpstra
45a904b396 ahb: ignore hrdata on an AHB error 
From the AHB spec:
 "A slave only has to provide valid data when a transfer completes with an OKAY
  response. ERROR responses do not require valid read data."
 2017-10-30 21:09:45 -07:00
Wesley W. Terpstra
6318d7d44c ahb: inject fuzzy errors 2017-10-30 21:09:45 -07:00
Wesley W. Terpstra
2912a76a2b axi4: inject fuzzy errors 2017-10-30 21:09:45 -07:00
Wesley W. Terpstra
e8ed450f13 unit tests: do not use LFSR16 which has a common seed! 
We want each LFSR to generate independent noise.
 2017-10-30 21:09:45 -07:00
Wesley W. Terpstra
ec70e5fb02 apb: inject fuzzy errors 2017-10-30 21:09:45 -07:00
Wesley W. Terpstra
0280a1f218 tilelink: add the ErrorEvaluator, a test bench error helper 2017-10-30 21:09:45 -07:00
Wesley W. Terpstra
2d12ddb4ed tilelink: ToAXI4 makes R channel errors sticky 2017-10-30 21:09:45 -07:00
Wesley W. Terpstra
d6f1612812 tilelink: ToAHB should make read errors sticky as well 2017-10-30 21:09:45 -07:00
Wesley W. Terpstra
4c9d9c6331 tilelink: optimize WidthWidget error circuit to nothing 2017-10-30 21:09:45 -07:00
Wesley W. Terpstra
0992a459be tilelink: Fragmenter should combine errors 2017-10-30 21:09:42 -07:00
Wesley W. Terpstra
13d0bf6808 tilelink: Monitor now enforces spec-defined error rules 2017-10-30 11:27:07 -07:00
Wesley W. Terpstra
a954f020a9 diplomacy: use new node style chaining 2017-10-28 11:34:16 -07:00
Wesley W. Terpstra
6aac658184 diplomacy: convert all helper objects to return nodes 2017-10-28 11:34:16 -07:00
Wesley W. Terpstra
41705808dd Bus: remove deprecated crossing attach methods 2017-10-28 11:34:16 -07:00
Wesley W. Terpstra
7cf5d4aa90 diplomacy: define only primary node types 2017-10-28 11:16:56 -07:00
Wesley W. Terpstra
eeb11a2693 coreplex: eliminate dead code 2017-10-27 01:13:35 -07:00
Wesley W. Terpstra
9f83db998e tile: don't chain too many unneeded TileLink adapters (#1075) 2017-10-27 01:12:58 -07:00
Wesley W. Terpstra
e12bdfdf9b coreplex: attach example external interrupts (#1076) 
Fixes #1071
 2017-10-27 01:12:42 -07:00
Wesley W. Terpstra
13981379c4 CoreplexClockCrossing: add a helper method to decide if a clock is useul (#1074) 2017-10-26 23:39:56 -07:00
Wesley W. Terpstra
1d8e539362 coreplex: confirm crossings actually cross the right boundary 2017-10-26 15:53:01 -07:00
Wesley W. Terpstra
60284082e7 diplomacy: add a hook for injecting code into LazyModule.module scope 2017-10-26 15:19:05 -07:00
Wesley W. Terpstra
a060c37173 diplomacy: expose the API to query a Node for its neighbours 2017-10-26 15:08:06 -07:00
Wesley W. Terpstra
e2d6d4d725 diplomacy: eliminate bindings dead-code 2017-10-26 15:02:21 -07:00
Wesley W. Terpstra
9e33ccdb05 rocket: clarify intent of boundaryBuffers and move to RocketTile 2017-10-26 13:58:52 -07:00
Wesley W. Terpstra
e76e0f6dce interrupts: add debugstring to nodes to show sync depth in graphml 2017-10-26 13:58:52 -07:00
Wesley W. Terpstra
2acff8d21f util: delete old long-deprecated crossing code 2017-10-26 13:58:52 -07:00
Wesley W. Terpstra
da7703aee9 crossings: deprecate non-island crossing style 2017-10-26 13:58:52 -07:00
Wesley W. Terpstra
76df1397e0 crossings: stop using deprecated APIs in tests 2017-10-26 13:04:32 -07:00
Wesley W. Terpstra
380cc6f03b axi4: now also supports the island pattern 2017-10-26 13:04:32 -07:00
Wesley W. Terpstra
05d48d1807 TLBuffer: replace TLBufferChain with TLBuffer.chain 2017-10-26 13:04:32 -07:00
Wesley W. Terpstra
ce2b904b19 coreplex: tidy up interrupt crossings 2017-10-26 13:04:32 -07:00
Wesley W. Terpstra
e30906589f coreplex: refactor crossings to use node pattern 2017-10-26 13:04:32 -07:00
Wesley W. Terpstra
6276ea4291 diplomacy: it possible for NodeHandles to put indirection on their attachment 2017-10-26 13:04:32 -07:00
Wesley W. Terpstra
8c5e8dd071 coreplex: leverage improved := composition 2017-10-26 13:04:32 -07:00
Wesley W. Terpstra
e894d64bca diplomacy: support := composition 
This makes it possible to treat chained composition associatively.
x := y :=? z :=* a ...

It also makes it easy to chain multiple optional adapters:
node :=? (Seq(a, b) ++ c ++ d)
 2017-10-26 13:04:32 -07:00
Henry Cook
b48ab985d0 coreplex: RocketTileWrapper now HasCrossingHelper 2017-10-26 13:04:32 -07:00
Henry Cook
9fe35382ea sbus: tile adapters in sbus scope 2017-10-26 13:04:32 -07:00
Henry Cook
95a2e6ef27 coreplex: improve tile attachment adapters 2017-10-26 13:04:32 -07:00
Wesley W. Terpstra
2175758050 interrupts: implement in crossing wrapper 2017-10-26 13:04:29 -07:00
Wesley W. Terpstra
c6f95570df IntNodes: moved from tilelink to their own package 2017-10-25 16:56:51 -07:00
Wesley W. Terpstra
6bc9c9fc6c coreplex: add a crossing wrapper to generalize the island pattern 2017-10-25 16:56:50 -07:00
Wesley W. Terpstra
7453186b59 diplomacy: add reflection for parent modules to nodes 2017-10-25 16:56:50 -07:00