David Harris
e231fc6b00
More verilator fixes, but bpred is broken
2021-06-09 21:03:03 -04:00
David Harris
9a17556de4
Start to parameterize number of PMP Entries
2021-06-08 15:29:22 -04:00
Kip Macsai-Goren
be99c18002
making mmu branch line up with main
2021-06-08 13:59:03 -04:00
Kip Macsai-Goren
41ceb20296
some cleanup of signals, not done yet
2021-06-08 13:39:32 -04:00
Kip Macsai-Goren
d69501c4fa
Cleaned up some unused signals
2021-06-04 21:04:19 -04:00
Kip Macsai-Goren
4a00fbaf04
Merge branch 'mmu' into main
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new mmu unit and moving pmp/pma now passes regression except for lint and buildroot
2021-06-04 17:07:56 -04:00
Kip Macsai-Goren
7e41b17e65
restructured so that pma/pmp are a part of mmu
2021-06-04 17:05:07 -04:00
Ross Thompson
147be536f1
Relocated the icache to the cache directoy.
2021-06-04 12:23:46 -05:00
David Harris
b836679ae1
Started MMU
2021-06-04 11:59:14 -04:00
David Harris
a61411995a
moved shared constants to a shared directory
2021-06-03 22:41:30 -04:00
Ross Thompson
db2a38c300
Fixed a few lint errors,
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clock gater was wrong,
missing signal definitions in branch predictor.
2021-06-02 09:33:24 -05:00
Ross Thompson
f5aa5d7c67
Forgot to include the new gshare predictor file.
2021-06-01 12:42:03 -05:00
Ross Thompson
8f9680556f
Merge branch 'main' of github.com:davidharrishmc/riscv-wally into main
2021-06-01 11:33:12 -05:00
Ross Thompson
5bc2a8b346
Now have global history working correctly.
2021-06-01 10:57:43 -05:00
Ross Thompson
1db8d0e59c
may have fixed the global branch history predictor.
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The solution required a completed rewrite and understanding of how the GHR needs to be speculatively updated and repaired.
2021-05-31 16:11:12 -05:00
bbracker
a45b61ede9
turns out I should not have tried renaming FStallD to FPUStallD because that name was already used! All the same it does feel weird to have two such signals floating around \(ah pun!\)
2021-05-28 23:11:37 -04:00
Ross Thompson
40bdcda32d
It's a bit sloppy, but the global history predictor is working correctly now.
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There were two major bugs with the predictor.
First the update mechanism was completely wrong. The PHT is updated with the GHR that was used to lookup the prediction. PHT[GHR] = Sat2(PHT[GHR], branch outcome).
Second the GHR needs to be updated speculatively as the branch is predicted. This is important so that back to back branches' GHRs are not the same. The must be different to avoid aliasing. Speculation of the GHR update allows them to be different. On mis prediction the GHR must be reverted.
This implementation is a bit sloppy with names and now the GHR recovery is performed. Updates to follow.
2021-05-27 23:06:28 -05:00
Ross Thompson
735e511073
fixed bug with icache miss spill fsm branch.
2021-05-25 14:26:22 -05:00
Ross Thompson
13034c7406
Fixed bug in the two bit sat counter branch predictor. The SRAM needs to be read enabled by StallF.
2021-05-24 23:24:54 -05:00
Ross Thompson
dd26b754eb
Fixed minor bug in instruction class decoding.
2021-05-24 13:41:14 -05:00
Ross Thompson
b06fda88ff
Fixed bug with instruction classification. The class decoder was incorretly labeling jalr acting as both jalr and jr (no link).
2021-05-24 12:37:16 -05:00
Ross Thompson
2aa4db470b
Fixed synthesis bug with icache valid bit.
2021-05-04 13:03:08 -05:00
Ross Thompson
87d3869a6e
Fixed icache pcmux control for handling miss spill miss.
2021-05-04 11:05:01 -05:00
Ross Thompson
ed4f2ecb24
fixed subtle typo in icache fsm. Was messing up hit spill hit.
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I believe the mibench qsort benchmark runs after this icache fix.
2021-05-03 16:55:36 -05:00
Ross Thompson
e09ac73eaf
Removed combinational loops between icache and PMA checker.
2021-05-03 14:51:25 -05:00
Ross Thompson
7185905f7b
Reduced icache to 1 port memory.
2021-05-03 14:47:49 -05:00
Ross Thompson
12b978fec2
Eliminated extra register and fixed ports to icache.
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Still need to support physical tag check and write in icache memory.
Still need to reduce to 1 port SRAM in icache.
I would like to refactor the icache code.
2021-05-03 12:04:54 -05:00
Ross Thompson
b57c187208
Fixed typo in ifu for bypassing branch predictor.
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Fixed missing signal name in local history predictor.
2021-05-03 08:56:45 -05:00
Jarred Allen
000f48cd75
Fix compile error in branch predictor
2021-04-29 14:36:56 -04:00
Shreya Sanghai
b554dc8e72
fixed bug in gshare, global and local history BP
2021-04-29 06:14:32 -04:00
Ross Thompson
14a69c1d06
Added the ability to exclude branch predictor.
2021-04-26 14:27:42 -05:00
Ross Thompson
a7e4d39ea1
Fixed issue with not saving the first cache block read on a miss spill.
2021-04-26 12:57:34 -05:00
bbracker
f921886451
merge cleanup; mem init is broken
2021-04-26 08:00:17 -04:00
bbracker
7947858481
it says I need to merge in order to pull
2021-04-26 07:46:24 -04:00
bbracker
8d77012995
progress on bus and lrsc
2021-04-26 07:43:16 -04:00
Ross Thompson
9e40fb072c
Merge branch 'tests' into icache-almost-working
2021-04-25 21:25:36 -05:00
Ross Thompson
c9bdaceddb
Fixed icache for 32 bit.
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Merge branch 'cache' into main
2021-04-22 16:45:29 -05:00
Ross Thompson
7c8d2e9b78
Partially working icache.
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The current issue is a StallF is required to halt the icache from getting an updated PCF. However
if the dmemory is the reason for a stall it is possible for the icache stall to hold the d memory request continuously causing d memory to repeatedly read from memory. This keeps StallF high and
the icache FSM is never allowed to complete.
2021-04-22 10:20:36 -05:00
Thomas Fleming
88bd151d55
Merge branch 'main' of github.com:davidharrishmc/riscv-wally into main
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Conflicts:
wally-pipelined/src/ifu/ifu.sv
2021-04-21 20:01:08 -04:00
Thomas Fleming
70c801331a
Implement virtual memory protection
2021-04-21 19:58:36 -04:00
Ross Thompson
50e893eec9
Fixed for the instruction spills.
2021-04-21 16:47:05 -05:00
Teo Ene
008b308b79
Fixed most relevant remaining synthesis compilation warnings with Ben
2021-04-21 16:06:27 -05:00
Ross Thompson
269ea7997c
major progress.
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It's running the icache is imperas tests now.
Compressed does not work yet.
2021-04-21 08:39:54 -05:00
Ross Thompson
a861a37b72
Why was the linter messed up?
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There are a number of combo loops which need fixing outside the icache. They may be fixed in main.
We get to instruction address 50 now!
2021-04-20 22:06:12 -05:00
Ross Thompson
daa1ab9261
Progress on icache. Fixed some issues aligning the PC with instruction. Still broken.
2021-04-20 21:19:53 -05:00
Ross Thompson
649589ee2c
Broken icache. Design is done. Time to debug.
2021-04-20 19:55:49 -05:00
Jarred Allen
59b340dac9
Merge branch 'main' into cache
2021-04-19 00:05:23 -04:00
Thomas Fleming
2c4682c4be
Connect tlb and icache properly
2021-04-15 14:48:39 -04:00
Jarred Allen
7b4b1a31ef
Merge branch 'main' into cache
2021-04-15 13:47:19 -04:00
Shreya Sanghai
75caa65df1
Cherry Pick merge of Shreya's localhistory predictor changes into main.
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fixed minor bugs in localHistory
2021-04-15 09:04:36 -05:00
