Luke Kenneth Casson Leighton [Tue, 30 Nov 2021 11:49:33 +0000 (11:49 +0000)]
move sim call before core run in test_core.py
to give PC a chance to settle in regfile
Luke Kenneth Casson Leighton [Tue, 30 Nov 2021 11:13:24 +0000 (11:13 +0000)]
getting formerly unused test_core.py operational
Luke Kenneth Casson Leighton [Mon, 29 Nov 2021 16:41:00 +0000 (16:41 +0000)]
whoops missed make_hazard_vec test
Luke Kenneth Casson Leighton [Mon, 29 Nov 2021 15:50:26 +0000 (15:50 +0000)]
whoops do the set/get of the write-vector at a single access point
for example: INT o, INT o2 is *two* write ports. therefore,
previously, there was a comb += wvint bitvector for o, which was
then OVERWRITTEN by a second comb += wvint bitvector for o2
instead, return the wvset/wvclr requests to connect_wrport, which
collates by regfile name and performs an additional or-tree-reduce
on the requests to set/get
Luke Kenneth Casson Leighton [Mon, 29 Nov 2021 13:43:36 +0000 (13:43 +0000)]
always set fwd_bus_mode=False on regfiles
Luke Kenneth Casson Leighton [Mon, 29 Nov 2021 13:19:45 +0000 (13:19 +0000)]
add MMU and SPR to list of FUs that must report "busy" i.e. block
Luke Kenneth Casson Leighton [Mon, 29 Nov 2021 10:26:35 +0000 (10:26 +0000)]
disallow overlap in core on LDST, Branch, and Trap.
these are all the ones that could cause exceptions or mess with ordering
Luke Kenneth Casson Leighton [Mon, 29 Nov 2021 10:22:09 +0000 (10:22 +0000)]
use dict style not setattr on submodules
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 14:32:21 +0000 (14:32 +0000)]
code-comments
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 14:11:23 +0000 (14:11 +0000)]
fix instructions of the type "read-reg-is-same-as-write"
this then caused write-after-write detection to go into a combinatorial
loop, which was fixed by not checking fu.issue_i but instead using
fu_enable (fu_bitdict[FU])
Tobias Platen [Sat, 27 Nov 2021 12:54:22 +0000 (13:54 +0100)]
loadstore testcase: read at random addresses
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 12:51:52 +0000 (12:51 +0000)]
FU-Regs matrix tidyup and comments
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 12:33:02 +0000 (12:33 +0000)]
minor tidyup on FU-Regs Matrix
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 12:20:33 +0000 (12:20 +0000)]
update FURegDepMatrix to multi-dest
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 12:19:57 +0000 (12:19 +0000)]
update naming on Reg_Rsv signals
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 11:54:37 +0000 (11:54 +0000)]
add copyright and attribution notices
update Reg_Rsv to multi-dest
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 11:44:07 +0000 (11:44 +0000)]
update FU_RW_Pending vectors to multi-dest
update Copyright and Attribution notices
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 11:19:57 +0000 (11:19 +0000)]
convert DependencyRow to multiple destination latches
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 10:40:47 +0000 (10:40 +0000)]
add copyright and attribution notices to dependence_cell.py
Luke Kenneth Casson Leighton [Sat, 27 Nov 2021 10:36:30 +0000 (10:36 +0000)]
update license and attribution in fu_reg_matrix.py
Luke Kenneth Casson Leighton [Fri, 26 Nov 2021 16:45:23 +0000 (16:45 +0000)]
convert score6600_multi over to using RegSpecs (in a fake way)
which by slow code-morphing the entire score6600_multi code can be
converted to be like core.py
Luke Kenneth Casson Leighton [Fri, 26 Nov 2021 15:23:40 +0000 (15:23 +0000)]
early use of Array unnecessarily (all uses are static references
not dynamic indexing: no pmux created or needed)
Luke Kenneth Casson Leighton [Fri, 26 Nov 2021 15:19:19 +0000 (15:19 +0000)]
early use of Array unnecessarily (all uses are static references
not dynamic indexing: no pmux created or needed)
Luke Kenneth Casson Leighton [Thu, 25 Nov 2021 21:41:04 +0000 (21:41 +0000)]
get score6600_multi operational again
main thing was a "delay" on go_read_i due to regfile read results being
one clock cycle behind.
Luke Kenneth Casson Leighton [Thu, 25 Nov 2021 21:38:54 +0000 (21:38 +0000)]
add debug prints in old simulator
Luke Kenneth Casson Leighton [Thu, 25 Nov 2021 21:38:42 +0000 (21:38 +0000)]
add debug prints in old simulator
Tobias Platen [Thu, 25 Nov 2021 17:54:21 +0000 (18:54 +0100)]
seperate invalid test case from other test cases
Tobias Platen [Thu, 25 Nov 2021 16:53:42 +0000 (17:53 +0100)]
mmu: add debug output
Tobias Platen [Thu, 25 Nov 2021 16:07:05 +0000 (17:07 +0100)]
add testcase for invalid pagetable
Tobias Platen [Thu, 25 Nov 2021 16:05:25 +0000 (17:05 +0100)]
pimem: reset on exception
Tobias Platen [Thu, 25 Nov 2021 15:49:06 +0000 (16:49 +0100)]
remove unuses dsisr signal
Tobias Platen [Thu, 25 Nov 2021 15:45:10 +0000 (16:45 +0100)]
reset state to idle on exception
Luke Kenneth Casson Leighton [Thu, 25 Nov 2021 09:43:14 +0000 (09:43 +0000)]
more sorting scoremulti
Luke Kenneth Casson Leighton [Thu, 25 Nov 2021 09:28:35 +0000 (09:28 +0000)]
more sorting out scoremulti
Luke Kenneth Casson Leighton [Thu, 25 Nov 2021 09:16:54 +0000 (09:16 +0000)]
add test pspec for scoremulti to work
Luke Kenneth Casson Leighton [Wed, 24 Nov 2021 22:46:04 +0000 (22:46 +0000)]
convert hazard bitvectors to Reset-Priority SRLatch from nmutil
the read/write port were seriously getting in the way, by way of the
operand forwarding etc. etc. need instead to get either the immediate-latched
value (combinatorial) or the sync-delayed one, depending on circumstances.
Tobias Platen [Wed, 24 Nov 2021 18:50:05 +0000 (19:50 +0100)]
fix exception handling in pi_ld
Tobias Platen [Wed, 24 Nov 2021 18:30:44 +0000 (19:30 +0100)]
Merge branch 'master' of ssh://git.libre-riscv.org:922/soc
Tobias Platen [Wed, 24 Nov 2021 18:30:25 +0000 (19:30 +0100)]
improve debug output in mmu.py
Luke Kenneth Casson Leighton [Wed, 24 Nov 2021 17:48:32 +0000 (17:48 +0000)]
fix write-after-write hazard detection
Luke Kenneth Casson Leighton [Wed, 24 Nov 2021 17:44:36 +0000 (17:44 +0000)]
when allow_overlap enabled do a manual wait until all FUs have
entirely finished befor going on to read the regfile state
this really should be done with the DMI interface, which needs updating
Luke Kenneth Casson Leighton [Wed, 24 Nov 2021 16:24:03 +0000 (16:24 +0000)]
code-comments
Luke Kenneth Casson Leighton [Wed, 24 Nov 2021 16:06:26 +0000 (16:06 +0000)]
add write-after-write hazard detection
stall if a WaW hazard is detected, continuing to assert the main decoder
so that the relevant bits of the write-vector can be read. these
bits are read *one clock behind* which is perfectly fine
Luke Kenneth Casson Leighton [Wed, 24 Nov 2021 15:18:08 +0000 (15:18 +0000)]
add 2nd hazard bitvector port for write-after-write
hazard detection
Luke Kenneth Casson Leighton [Wed, 24 Nov 2021 12:31:52 +0000 (12:31 +0000)]
whoops merged the two write-ports for RT and RA-with-update
Luke Kenneth Casson Leighton [Wed, 24 Nov 2021 11:55:14 +0000 (11:55 +0000)]
disable hazard vectors when overlap is not requested in core.py
Luke Kenneth Casson Leighton [Tue, 23 Nov 2021 22:45:03 +0000 (22:45 +0000)]
update submodules
Luke Kenneth Casson Leighton [Tue, 23 Nov 2021 22:44:55 +0000 (22:44 +0000)]
more comments
Tobias Platen [Tue, 23 Nov 2021 18:12:10 +0000 (19:12 +0100)]
pimem changes for st exception handling
Tobias Platen [Tue, 23 Nov 2021 17:42:22 +0000 (18:42 +0100)]
fix test_loadstore1.py
Luke Kenneth Casson Leighton [Tue, 23 Nov 2021 15:53:35 +0000 (15:53 +0000)]
add FU write-after-write hazard detection Signal (dummy so far)
this has to be set up in the connect_write section but then
*used* in connect_rdport in order to stop reading from happening
strictly speaking it should actually stop issue, but we already
established that that way lies madness (combinatorial loops).
this may turn out to be a bit more complex than initially planned
due to some instructions potentially not having read at all
(only write)
Luke Kenneth Casson Leighton [Tue, 23 Nov 2021 15:21:15 +0000 (15:21 +0000)]
add code-comments, link to in-order core
Luke Kenneth Casson Leighton [Tue, 23 Nov 2021 15:03:09 +0000 (15:03 +0000)]
more use of namedtuples in core.py for clarity
Luke Kenneth Casson Leighton [Tue, 23 Nov 2021 12:21:36 +0000 (12:21 +0000)]
start some use of namedtuples in core.py
Luke Kenneth Casson Leighton [Tue, 23 Nov 2021 12:11:49 +0000 (12:11 +0000)]
use some namedtuples to make things clearer in core.py
Luke Kenneth Casson Leighton [Tue, 23 Nov 2021 12:03:19 +0000 (12:03 +0000)]
use fascinating trick of defaultdict-of-defaultdicts
Tobias Platen [Mon, 22 Nov 2021 18:35:53 +0000 (19:35 +0100)]
add store testcase
Tobias Platen [Mon, 22 Nov 2021 17:57:54 +0000 (18:57 +0100)]
fix fast exception handling for pi_st
Luke Kenneth Casson Leighton [Mon, 22 Nov 2021 14:51:02 +0000 (14:51 +0000)]
make FetchFSM take PC as an input in its ispec
Luke Kenneth Casson Leighton [Mon, 22 Nov 2021 14:41:25 +0000 (14:41 +0000)]
local variable rename in FetchFSM
Luke Kenneth Casson Leighton [Mon, 22 Nov 2021 14:37:37 +0000 (14:37 +0000)]
split out FetchFSM into separate module
there are DriverConflicts which result in the FetchFSM being merged
into TestIssuerInternal but that is actually ok for now
Luke Kenneth Casson Leighton [Mon, 22 Nov 2021 11:59:19 +0000 (11:59 +0000)]
whoops accidentally committed commented-out test for overlap
in test_runner.py
Luke Kenneth Casson Leighton [Sun, 21 Nov 2021 22:57:35 +0000 (22:57 +0000)]
reset execute back to ISSUE_START if at INSN_WAIT and
stopping was requested.
Luke Kenneth Casson Leighton [Sun, 21 Nov 2021 22:44:42 +0000 (22:44 +0000)]
restrict (refine) hazard selection to the one being picked for this port
Luke Kenneth Casson Leighton [Sun, 21 Nov 2021 22:21:52 +0000 (22:21 +0000)]
block picker hazard on input to PriorityPicker rather than output
reason: another register could be picked if the input is blocked
but if the output is masked out, the picker will sit there with the
highest priority port stopping all others
Luke Kenneth Casson Leighton [Sun, 21 Nov 2021 21:12:14 +0000 (21:12 +0000)]
parse test_issuer args allow option "allow-overlap" to be optional
Luke Kenneth Casson Leighton [Sun, 21 Nov 2021 21:10:47 +0000 (21:10 +0000)]
complex. TestRunner now does not work properly unless recognising
that first, instructions can complete out-of-order from which they were
issued, and second, that just because the Function Unit has said it
accepted the instruction does not mean it has actually completed.
TestRunner therefore needed quite a bit of sorting out
Luke Kenneth Casson Leighton [Sun, 21 Nov 2021 21:09:09 +0000 (21:09 +0000)]
fixed issue with hazard dependencies, read will nott
take place until write dependencies are clear. currently extremely
draconian "ban" on entire FU progressing, actually probably all FUs
progressing, until write-hazards are clear. can sort out later
Tobias Platen [Sun, 21 Nov 2021 15:37:11 +0000 (16:37 +0100)]
add testcase for fast exceptions on store
Tobias Platen [Sat, 20 Nov 2021 15:16:37 +0000 (16:16 +0100)]
fix pi_ld testcase
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 19:20:13 +0000 (19:20 +0000)]
add both bitdict and selected args to connect_rd/wrport
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 17:56:23 +0000 (17:56 +0000)]
sorting out issue hazard conflicts in core.
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 17:41:25 +0000 (17:41 +0000)]
debug and cleanup
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 16:23:12 +0000 (16:23 +0000)]
rename instruction_active to instr_active in core
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 16:22:18 +0000 (16:22 +0000)]
read latch on regfile ports was fine, the combinatorial loop
is in the hazard detection on instruction issue
Tobias Platen [Fri, 19 Nov 2021 16:13:04 +0000 (17:13 +0100)]
Merge branch 'master' of ssh://git.libre-riscv.org:922/soc
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 15:33:58 +0000 (15:33 +0000)]
latch copy of read register numbers, not in use due to combinatorial loop
of some kind
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 14:49:41 +0000 (14:49 +0000)]
use read spec in connect_rdport rather than list of reads
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 14:47:54 +0000 (14:47 +0000)]
capture write regfile numbers into write latches in core
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 14:12:34 +0000 (14:12 +0000)]
code tidyup / comments, and use defaultdict
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 13:59:38 +0000 (13:59 +0000)]
create lists of latches in each FU, to record the read/write register
numbers required by the FU to read/write to regfiles.
previously, in the FSM-only version, these read/write regnums were
held (globally) by TestIssuer, and because only one instruction was
active, it did not matter.
now with the possibility of multiple instructions being run, it matters
(a lot)
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 13:22:05 +0000 (13:22 +0000)]
for some reason DMI CTRL returns status of 0x6 not 0x0
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 13:17:49 +0000 (13:17 +0000)]
missing argument, domain="sync" in JTAG instance
Luke Kenneth Casson Leighton [Fri, 19 Nov 2021 13:17:27 +0000 (13:17 +0000)]
return None if data returned is empty
Luke Kenneth Casson Leighton [Thu, 18 Nov 2021 23:19:32 +0000 (23:19 +0000)]
remove combinatorial loop in core instruction conflict detection
Luke Kenneth Casson Leighton [Thu, 18 Nov 2021 22:52:34 +0000 (22:52 +0000)]
experimenting with overlapping instructions, bit of a mess
Luke Kenneth Casson Leighton [Thu, 18 Nov 2021 22:08:00 +0000 (22:08 +0000)]
set up core processing FSM, which captures data if FU is not ready
Luke Kenneth Casson Leighton [Thu, 18 Nov 2021 21:40:48 +0000 (21:40 +0000)]
set up a temporary copy of CoreInput
(and fix CoreInput.eq, sigh)
Luke Kenneth Casson Leighton [Thu, 18 Nov 2021 21:24:19 +0000 (21:24 +0000)]
experiment allowing overlap (activated with --allow-overlap) in TestIssuer
Luke Kenneth Casson Leighton [Thu, 18 Nov 2021 13:25:29 +0000 (13:25 +0000)]
remove unneeded import
Tobias Platen [Thu, 18 Nov 2021 19:01:12 +0000 (20:01 +0100)]
more work on test_loadstore1
Jacob Lifshay [Wed, 17 Nov 2021 20:49:41 +0000 (12:49 -0800)]
start adding bitmanip FU
Tobias Platen [Wed, 17 Nov 2021 18:34:36 +0000 (19:34 +0100)]
PortInterfaceBase: fix fast exception handling
Tobias Platen [Wed, 17 Nov 2021 18:04:20 +0000 (19:04 +0100)]
whitespace
Tobias Platen [Wed, 17 Nov 2021 18:03:23 +0000 (19:03 +0100)]
Merge branch 'master' of ssh://git.libre-riscv.org:922/soc
Tobias Platen [Wed, 17 Nov 2021 18:02:38 +0000 (19:02 +0100)]
fix mistake in test_pi2ls.py
Luke Kenneth Casson Leighton [Wed, 17 Nov 2021 18:01:27 +0000 (18:01 +0000)]
reading of regfile bitvector added, which activates on a per-FU basis
at the regfile read port
this is somewhat complete overkill because strictly speaking the
read should be done at issue time. fortunately, merging of lots of ORs
results in the exact same thing, just distributed
horribly inefficient though
Luke Kenneth Casson Leighton [Wed, 17 Nov 2021 17:42:05 +0000 (17:42 +0000)]
core hazard bitvector regfiles need to be readable
immediately (combinatorial) not via sync. allow synced option to
pass through from VirtualRegPort to RegFileArray
Tobias Platen [Wed, 17 Nov 2021 17:53:54 +0000 (18:53 +0100)]
fixed busy waiting in pi_st
Luke Kenneth Casson Leighton [Wed, 17 Nov 2021 16:23:45 +0000 (16:23 +0000)]
add option to test_issuer.py to allow for overlapping issue of
instructions. this is for Core hazard detection prior to moving to
an in-order core