Ross Thompson
7fe70c3cc6
Removed the fault state from the hptw. Now writing TLB faults into the I/DTLBs. This has two advantages.
...
1: It simplifies the interactions between the caches and the hptw.
2: instruction page faults are fetched 3 times, caching them in the ITLB speeds up this process.
There are two downsides.
1: Pollute the TLBs with not very relavent translations
2: Have to compute the misalignment. This can be cached in the TLB which only costs 1 flip flop
for each TLB line.
2021-12-23 12:40:22 -06:00
Ross Thompson
f863bdc495
linux-wave.do changes.
2021-12-21 22:37:55 -06:00
Ross Thompson
6a8e917e06
It was possible for a load/store followed by tlb miss and update to have an exception and still commit its result to memory or register.
2021-12-21 15:59:56 -06:00
Ross Thompson
7844d3f064
Fixed bug where the wrong address is read into the icache memory.
2021-12-21 15:16:00 -06:00
Ross Thompson
8b97aaac3e
Fixed complex bug where FENCE is instruction class miss predicted as a taken branch.
2021-12-21 11:29:28 -06:00
Ross Thompson
3f62a64056
Identified bug in the IFU which selects PCNextF when InvalidateICacheM is true. If the ID is invalid PCNextF should NOT be PCE.
2021-12-20 23:45:55 -06:00
Ross Thompson
a157235a4b
Merge branch 'main' of github.com:davidharrishmc/riscv-wally into main
2021-12-20 23:27:46 -06:00
Ross Thompson
ffe792bcfc
Fixed bug on icache spill. if the cpu stalled on the completion it was possible to use the wrong address for the sram read. Also miss spill hit always selected the wrong address.
2021-12-20 23:27:37 -06:00
David Harris
bf9082b0ad
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-12-20 21:09:20 -08:00
David Harris
475fa01767
Fixing paths in wally-setup.sh
2021-12-20 21:08:34 -08:00
Ross Thompson
50b307bc0e
Looks like rdtime was accidentally replaced with rrame from a find and replace.
2021-12-20 21:26:38 -06:00
Ross Thompson
8416cae3fe
Fixed Type 5b interaction between dcache and hptw.
...
This is a load concurrent with ITLBMiss.
2021-12-20 18:33:31 -06:00
Ross Thompson
b6d75d453a
Modified LSU verilog is compatible with vivado. have to use extra logic IEUAdrExtM.
2021-12-20 10:03:56 -06:00
Ross Thompson
beb1988539
Merge branch 'main' of github.com:davidharrishmc/riscv-wally into main
2021-12-20 10:03:19 -06:00
Ross Thompson
df8bd78679
More signal name cleanup in LSU.
2021-12-19 22:47:48 -06:00
Ross Thompson
3eb5f33705
Remove verbosity from lsu state machine.
2021-12-19 22:41:34 -06:00
Ross Thompson
d3c3422d12
Rename of SelPTW to SelHPTW.
2021-12-19 22:24:07 -06:00
Ross Thompson
8feb36b926
Signal renames.
2021-12-19 22:21:03 -06:00
Ross Thompson
dc82d44f9e
Hardware reductions in the lsu.
2021-12-19 22:00:28 -06:00
Ross Thompson
dc95896303
Removed HPTWStall. Not needed as InterlockStall from the LSU provides the equivalent.
2021-12-19 21:36:54 -06:00
Ross Thompson
138da1fefa
Removed lsuArb and placed remaining logic in lsu.sv.
...
Removed after itlb walk signal as the dcache no longer has any need for this.
Formated lsu.sv
2021-12-19 21:34:40 -06:00
Ross Thompson
596cc4fde4
Moved convert2bin.py to the tests directory. This file converts the qemu ram.txt output into a binary for copy to flash card.
...
mv qemu patches to tests directory.
2021-12-19 20:11:32 -06:00
David Harris
a25d541dcf
Moved generate of conditional units to hart
2021-12-19 17:03:57 -08:00
David Harris
3c3bfd055e
Moved generate statements for optional units into wallypipelinedhart
2021-12-19 16:53:41 -08:00
Ross Thompson
d9cc9afd49
Changes to buildroot to support MemAdrM to IEUAdrM name changes.
2021-12-19 18:24:40 -06:00
Ross Thompson
32a4afc7a1
Merge branch 'main' of github.com:davidharrishmc/riscv-wally into main
2021-12-19 18:16:49 -06:00
Ross Thompson
a39b47d226
Switched to using an always block for lsu stall logic. This avoids the problematic x propagation.
2021-12-19 18:16:08 -06:00
Ross Thompson
eceb418056
Implemented what I think is the last required change for the lsu state machine.
2021-12-19 17:57:12 -06:00
Ross Thompson
fe5c05eb8d
Created hack to get around imperas64mmu unknown (value = x) bug.
2021-12-19 17:53:13 -06:00
Ross Thompson
c453b285dc
Fixed bug where icache did not replay PCF on itlb miss.
2021-12-19 17:01:13 -06:00
Ross Thompson
c9291655da
Fixed bug most of the bugs related to the dcache changes, but the mmu tests don't pass.
2021-12-19 16:12:31 -06:00
David Harris
53cd2ac049
Merge branch 'main' of https://github.com/davidharrishmc/riscv-wally into main
2021-12-19 13:53:53 -08:00
David Harris
9e6c9c38c0
ALUControl cleanup
2021-12-19 13:53:45 -08:00
Katherine Parry
e3f2a252cd
fixed some small errors in FMA
2021-12-19 13:51:46 -08:00
Ross Thompson
f4d778c2f6
Corrected the LSU's fsm for stalling CPU. Removed state from hptw fsm.
2021-12-19 15:10:33 -06:00
Ross Thompson
a445bedcd2
Modified the icache memory to read using the virtual (non physical) address in the PCNextF stage.
...
This allows recovering from an ITLBMiss to be 1 cycle after and simplifies the hptw slightly.
2021-12-19 14:57:42 -06:00
Ross Thompson
225cd5a114
Renamed MemAdrM to IEUAdrM. This will free the name MemAdrm for use in the DCache.
2021-12-19 14:00:30 -06:00
Ross Thompson
cd3c1032b7
Adds FSM to LSU which will handle the interactions between the hptw and dcache. This will dramatically simplify the dcache by removing all walker states.
2021-12-19 13:55:57 -06:00
Ross Thompson
1126135b80
minro change. comments about needed changes in dcache.
2021-12-19 13:53:02 -06:00
David Harris
f201af4bb7
Renamed zero to eq in flag generation
2021-12-19 11:49:15 -08:00
David Harris
406f129bed
Controller fix
2021-12-18 22:08:23 -08:00
David Harris
67577d7c91
Renamed RD1D to R1D, etc.
2021-12-18 21:26:00 -08:00
David Harris
721d0b5bcf
Simplified shifter right input
2021-12-18 10:25:40 -08:00
Ross Thompson
4daeb6657f
Merge branch 'tlb_fixes' into main
2021-12-18 12:24:17 -06:00
David Harris
7e026f3e78
Simplified Shifter Right input
2021-12-18 10:21:17 -08:00
David Harris
27ec8ff893
Shared ALU mux input for shifts
2021-12-18 10:08:52 -08:00
David Harris
eed2765033
Factored out common parts of shifter
2021-12-18 10:01:12 -08:00
David Harris
53baf3e787
Cleaning shifter
2021-12-18 09:43:09 -08:00
David Harris
ebcffcdebd
Moved W64 truncation after result mux
2021-12-18 09:27:25 -08:00
David Harris
23c6b6370f
Forwarding logic factoring
2021-12-18 05:40:38 -08:00
