Ross Thompson
b9902b0560
Fixed how the dcache and page table walker stall cpu so that once a tlb miss occurs the CPU is always stalled until the walk is complete, the tlb updated, and the dcache fetched and hits.
2021-07-15 11:00:42 -05:00
Ross Thompson
8610ef204c
Renamed DCacheStall to LSUStall in hart and hazard.
...
Added missing logic in lsu.
2021-07-15 10:16:16 -05:00
Ross Thompson
704f4f724e
dcache STATE_CPU_BUSY needs to assert CommittedM. This is required to ensure a completed memory operation is not bound to an interrupt. ie. MEPC should not be PCM when committed.
2021-07-14 23:08:07 -05:00
Ross Thompson
ba1e1ec231
Finally have the ptw correctly walking through the dcache to update the itlb.
...
Still not working fully.
2021-07-14 22:26:07 -05:00
Katherine Parry
c74d26eea4
Fixed lint warning
2021-07-14 21:24:48 -04:00
Ross Thompson
c79650b508
Added d cache StallW checks for any time the cache wants to go to STATE_READY.
2021-07-14 17:25:50 -05:00
Ross Thompson
2c946a282f
Fixed d cache not honoring StallW for uncache writes and reads.
2021-07-14 17:23:28 -05:00
Katherine Parry
f5bfdf46db
fpu unpacking unit created
2021-07-14 17:56:49 -04:00
Ross Thompson
e91501985c
Routed CommittedM and PendingInterruptM through the lsu arb.
2021-07-14 16:18:09 -05:00
Ross Thompson
adce800041
Fixed a bug where the dcache did not update the read data if the CPU was stalled, but the memory not stalled.
2021-07-14 15:47:38 -05:00
Ross Thompson
d78e31e9df
Forgot to include one hot decoder.
2021-07-14 15:46:52 -05:00
Ross Thompson
f4295ff097
Separated interruptM into PendingInterruptM and InterruptM. The d cache now takes in both exceptions and PendingInterrupts.
...
This solves the committedM issue.
2021-07-14 15:00:33 -05:00
bbracker
335afb14e7
testvector unlinker for dev purposes
2021-07-14 11:05:34 -04:00
James Stine
e6d19be87c
put back for now to test fdiv
2021-07-14 06:48:29 -05:00
bbracker
46e704b7ef
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-14 00:21:39 -04:00
bbracker
92899b33f8
make testvector scripts agree with new file structure; use symbols to determine end of linux boot
2021-07-14 00:21:29 -04:00
Ross Thompson
9b756d6a94
Implemented uncached reads.
2021-07-13 23:03:09 -05:00
Ross Thompson
e8bf502bc2
Added CommitedM to data cache output.
2021-07-13 22:43:42 -05:00
bbracker
28887bb3d5
needed to create a directory for gdb script
2021-07-13 19:39:57 -04:00
Ross Thompson
3e57c899a2
Partially working changes to support uncached memory access. Not sure what CommitedM is.
2021-07-13 17:24:59 -05:00
James E. Stine
46001fef27
mod 2 of fpdivsqrt update
2021-07-13 16:59:17 -04:00
James E. Stine
8382a17969
Update fpdivsqrt item until move into uarch
2021-07-13 16:53:20 -04:00
bbracker
f2bf4920d7
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-13 16:16:04 -04:00
bbracker
64d22753b5
changed QEMU to use different ports
2021-07-13 16:15:51 -04:00
Ross Thompson
baa2b5d15f
Fixed interaction between icache stall and dcache. On hit dcache needs to enter a cpu busy state when the cpu is stalled.
2021-07-13 14:51:42 -05:00
Ross Thompson
3c1a717399
Fixed the fetch buffer accidental overwrite on eviction.
2021-07-13 14:21:29 -05:00
Ross Thompson
32f27cfecf
Dcache AHB address generation was wrong. Needed to zero the offset.
2021-07-13 14:19:04 -05:00
Ross Thompson
afc1bc9c38
Moved StoreStall into the hazard unit instead of in the d cache.
2021-07-13 13:20:50 -05:00
David Harris
9de97c1e20
Fixed busybear by restoring InstrValidW needed by testbench
2021-07-13 14:17:36 -04:00
Ross Thompson
47e16f5629
Fixed back to back store issue.
...
Note there is a bug in the lsuarb which needs to arbitrate a few execution stage signals.
2021-07-13 12:46:20 -05:00
David Harris
2ba82d1a5c
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-13 13:26:51 -04:00
David Harris
223086ac33
added or.sv
2021-07-13 13:26:40 -04:00
Katherine Parry
ca19b2e215
Fixed writting MStatus FS bits
2021-07-13 13:22:04 -04:00
Katherine Parry
efdec72df1
Fixed writting MStatus FS bits
2021-07-13 13:20:30 -04:00
David Harris
93d6688c3c
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-13 13:19:24 -04:00
David Harris
b5dddec858
Fixed InstrValid from W to M stage for CSR performance counters
2021-07-13 13:19:13 -04:00
bbracker
3565580f40
updated buildroot make procedure to incorporate configs more robustly
2021-07-13 12:40:14 -04:00
Ross Thompson
224e3b2991
Fixed subword write. subword read should not feed into subword write.
2021-07-13 11:21:44 -05:00
Ross Thompson
30b7c4436c
restored rv64ic config back to full sized dtim.
2021-07-13 11:18:54 -05:00
Ross Thompson
3951eb56f5
Modularized the shadow memory to reduce performance hit.
2021-07-13 10:55:57 -05:00
Ross Thompson
e594eb540d
Got the shadow ram cache flush working.
2021-07-13 10:03:47 -05:00
bbracker
99587f58f7
whoops I accidentally made main.config into a symbolic link; now it is a source file
2021-07-13 11:00:01 -04:00
bbracker
fab906821a
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-13 10:04:13 -04:00
bbracker
4b615c1564
working config for a buildroot that boots
2021-07-13 10:04:09 -04:00
David Harris
861ef5e1cb
Replaced .or with or_rows structural code in MMU read circuitry for synthesis.
2021-07-13 09:32:02 -04:00
Ross Thompson
49f6eec579
Team work on solving the dcache data inconsistency problem.
2021-07-12 23:46:32 -05:00
Ross Thompson
ecc9b5006e
Now updates the dtim with the dirty data in the dcache.
...
Simulation is showing issues. It lookslike the cache is not
evicting the correct data.
2021-07-12 15:13:27 -05:00
Ross Thompson
1cc258ade1
Progress towards the test bench flush.
2021-07-12 14:22:13 -05:00
Katherine Parry
f3ac46df86
fcvt.sv cleanup
2021-07-11 21:30:01 -04:00
Katherine Parry
36f59f3c99
Almost all convert instructions pass Imperas tests
2021-07-11 18:06:33 -04:00
bbracker
6bd0ca673c
rootfs.cpio no longer overlaps
2021-07-11 05:11:12 -04:00
Ross Thompson
f26d635614
Fixed the spurious AHB requests to address 0. Somehow by not having a default
...
(else) in the fsm branch selection for STATE_READY in the d cache it was
possible to take an invalid branch through the fsm.
2021-07-10 22:34:47 -05:00
Ross Thompson
fed7042fd9
Loads are working.
...
There is a bug when the icache stalls 1 cycle before the d cache.
2021-07-10 22:15:44 -05:00
Ross Thompson
60ed023734
Actually writes the correct data now on stores.
2021-07-10 17:48:47 -05:00
Ross Thompson
efe37ea079
Write miss with eviction works.
2021-07-10 15:17:40 -05:00
Ross Thompson
d65c01bc29
Write Hits and Write Misses without eviction are working correctly! The next
...
step is to add eviction of dirty lines.
2021-07-10 10:56:25 -05:00
bbracker
feaeeaf6ac
greatly stripped down unused stuff in linux config
2021-07-10 11:53:35 -04:00
David Harris
20f2a4e47c
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-09 19:18:35 -04:00
David Harris
d3ab6b192a
added missing tlbmixer.sv
2021-07-09 19:18:23 -04:00
bbracker
3be73695e3
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-09 18:56:28 -04:00
bbracker
2a54f6f242
fix_mem.py bugfix
2021-07-09 18:56:17 -04:00
Ross Thompson
b1ceeb40df
Loads in modelsim, but the first store double does not function correctly. The write address is wrong so the cache is updated using the wrong address.
...
I think this is do to the cycle latency of stores. We probably need extra muxes to select between MemPAdrM and MemPAdrW depending on if the write is a
full cache block or a word write from the CPU.
2021-07-09 17:14:54 -05:00
bbracker
1f52a2f938
organize/update buildroot scripts for new image
2021-07-09 17:03:47 -04:00
Ross Thompson
4c0cee1c19
Design loads in modelsim, but trap is an X.
2021-07-09 15:37:16 -05:00
Ross Thompson
ec80cc1820
Lint passes, but I only hope to have loads working. Stores, lr/sc, atomic, are not fully implemented.
...
Also faults and the dcache ptw interlock are not implemented.
2021-07-09 15:16:38 -05:00
David Harris
39bd7e7edc
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-09 07:53:30 -04:00
David Harris
5c2f774c35
Simplified tlbmixer mux to and-or
2021-07-08 23:34:24 -04:00
David Harris
74b6d13195
Fixed missing stall in InstrRet counter
2021-07-08 20:08:04 -04:00
bbracker
44a48cf28d
organize linux-testgen folder, add readme to describe Buildroot process, add Buildroot config source files
2021-07-08 19:18:11 -04:00
Ross Thompson
94c3fde724
Renamed signal in LSU toLSU and fromLSU to toDCache and fromDCache.
2021-07-08 18:03:52 -05:00
Ross Thompson
93aa39ca31
completed read miss branch through dcache fsm.
...
The challenge now is to connect to ahb and lsu.
2021-07-08 17:53:08 -05:00
David Harris
4f1a85ca7c
Eliminate reserved bits from TLB RAM
2021-07-08 17:35:00 -04:00
David Harris
38772de21f
Array of muxes in tlbmixer; abbreviated PPN and VPN to match diagram
2021-07-08 16:58:11 -04:00
David Harris
1190729896
TLB cleanup to match diagrams
2021-07-08 16:52:06 -04:00
Ross Thompson
910ddb83ae
This d cache fsm is getting complex.
2021-07-08 15:26:16 -05:00
Ross Thompson
1fe06bc670
Partial implementation of the data cache. Missing the fsm.
2021-07-07 17:52:16 -05:00
David Harris
5d5274ec73
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-07 06:32:29 -04:00
David Harris
2bab3f769b
Renamed tlb ReadLines to Matches
2021-07-07 06:32:26 -04:00
Abe
84711fbdc8
Updated MISA defining as well as porting sizes for peripherals (34 to 56)
2021-07-07 02:37:09 -04:00
Abe
b757c96b2d
Changed SvMode to SVMode on line 76
2021-07-06 23:28:58 -04:00
David Harris
af619dcd75
Added ASID matching for CAM
2021-07-06 18:56:25 -04:00
Kip Macsai-Goren
8350622f65
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-06 18:54:41 -04:00
David Harris
7d857cf4bd
more TLB name touchups
2021-07-06 18:39:30 -04:00
Kip Macsai-Goren
e08a578908
fixed upper bits page fault signal
2021-07-06 18:32:47 -04:00
David Harris
2e2aa2a972
connected signals in tlb by name instead of .*
2021-07-06 17:22:10 -04:00
David Harris
ee3a321002
changed tlbphysicalpagemask to structural
2021-07-06 17:16:58 -04:00
David Harris
f960561cbb
changed tlbphysicalpagemask to structural
2021-07-06 17:08:04 -04:00
David Harris
032c38b7e7
MMU produces page fault when upper bits aren't equal. Renamed input to MMU to be 'Address' and moved translation mux into MMU out of TLB
2021-07-06 15:29:42 -04:00
Ross Thompson
412691df2d
Merge branch 'main' of github.com:davidharrishmc/riscv-wally into main
2021-07-06 13:45:20 -05:00
Ross Thompson
3345ed7ff4
Merged several of the load/store/instruction access faults inside the mmu.
...
Still need to figure out what is wrong with the generation of load page fault when dtlb hit.
2021-07-06 13:43:53 -05:00
bbracker
d3dd70e3e6
more completely uncomment MMU tests to make sim wally work
2021-07-06 14:33:52 -04:00
Abe
8854532a79
Disabled MCOUNTINHIBIT to enable csr counters (changed to 32'h0 on line 140)
2021-07-06 12:37:58 -04:00
Ross Thompson
7af8cfba18
Merge branch 'main' of github.com:davidharrishmc/riscv-wally into main
2021-07-06 10:41:45 -05:00
Ross Thompson
6e7e318396
Fixed bug in the LSU pagetable walker interlock.
2021-07-06 10:41:36 -05:00
David Harris
b4082ba776
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-06 10:44:17 -04:00
David Harris
30fdd7abc8
Cleaned up tlb output muxing
2021-07-06 10:44:05 -04:00
David Harris
d58cad89a8
Replaced muxing of upper address bits with disregarding their match. Moved WriteEnables gate into tlblru to eliminate WriteLines
2021-07-06 10:38:30 -04:00
Kip Macsai-Goren
7e9961cac4
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-07-06 10:16:34 -04:00
David Harris
694badcc6b
Created tlbcontrol module to hide details
2021-07-06 03:25:11 -04:00
David Harris
f805aea236
Implemented TSR, TW, TVM, MXR status bits
2021-07-06 01:32:05 -04:00
