riscv/rocket-chip
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53 Commits

Author SHA1 Message Date
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
Henry Cook
66e4bfc2d9 rocket: TIMs should never be cached 2017-10-11 18:22:52 -07:00
Andrew Waterman
f3825270c1 Add some covers for L1 memory system 2017-10-09 18:33:36 -07:00
Wesley W. Terpstra
0a287df0f7 Merge remote-tracking branch 'origin/master' into auto-diplomacy-bundles 2017-09-27 16:28:10 -07:00
Henry Cook
05112b49a3 Merge branch 'master' into tl-error 2017-09-27 14:50:17 -07:00
Wesley W. Terpstra
5323cf88dd util: add Option.unzip 2017-09-25 12:06:31 -07:00
Wesley W. Terpstra
60614055e3 diplomacy: eliminate some wasted IdentityNodes using cross-module refs 2017-09-25 12:06:27 -07:00
Wesley W. Terpstra
b9a2e4c243 diplomacy: API beautification 2017-09-22 15:01:42 -07:00
Wesley W. Terpstra
9217baf9d4 diplomacy: change API to auto-create node bundles => cross-module refs 2017-09-22 15:01:39 -07:00
Henry Cook
30c8c8c517 Revert "try to give seqmems clearer names" 
This reverts commit 8db5bbbae0.

This attempt at clarification instead results in confusing generated verilog like:
`dcache_data_arrays_0 icache_data_arrays_0 (...);`
because of deduplication of identically dimensioned SRAMs...
 2017-09-21 18:02:32 -07:00
Henry Cook
a887baa615 rocket: base trait for reporting ecc errors 2017-09-21 14:58:47 -07:00
Andrew Waterman
9b828a2640 Only look at error signal on last beat 2017-09-20 15:15:21 -07:00
Andrew Waterman
034ea722f4 Report I$ errors 2017-09-20 00:05:07 -07:00
Henry Cook
8db5bbbae0 try to give seqmems clearer names 2017-09-19 13:41:11 -07:00
Andrew Waterman
a45997d03f Separate I$ parity error from miss signal 
Handle parity errors with a pipeline flush rather than a faster
frontend replay, reducing a critical path.
 2017-08-04 16:59:21 -07:00
Andrew Waterman
f483bab4aa Fix I$ miss perfctr 
The old version was counting prefetches, too.
 2017-08-03 00:52:12 -07:00
Andrew Waterman
2537d0d54e Optionally prefetch next I$ line into L2$ on miss 2017-08-02 17:10:56 -07:00
Wesley W. Terpstra
9804bdc34e tilelink: remove obsolete addr_lo signal (#895) 
When we first implemented TL, we thought this was helpful, because
it made WidthWidgets stateless in all cases. However, it put too
much burden on all other masters and slaves, none of which benefitted
from this signal. Furthermore, even with addr_lo, WidthWidgets were
information lossy because when they widen, they have no information
about what to fill in the new high bits of addr_lo.
 2017-07-26 16:01:21 -07:00
Henry Cook
4c595d175c Refactor package hierarchy and remove legacy bus protocol implementations (#845) 
* Refactors package hierarchy.

Additionally:
  - Removes legacy ground tests and configs
  - Removes legacy bus protocol implementations
  - Removes NTiles
  - Adds devices package
  - Adds more functions to util package
 2017-07-07 10:48:16 -07:00
Andrew Waterman
b2351c5fbf Use consistent casing 2017-07-06 11:16:56 -07:00
Andrew Waterman
438abc76d2 Handle TL errors in L1 I$ 
Cache the error bit in the tag array; report precisely on access.
 2017-07-06 01:02:11 -07:00
Wesley W. Terpstra
fbcd6f0eb2 Revert "rocket: link itim to its cpu" 
This reverts commit 48390ed604.
 2017-06-28 23:10:57 -07:00
Wesley W. Terpstra
48390ed604 rocket: link itim to its cpu 2017-06-28 15:06:19 -07:00
Wesley W. Terpstra
84dc23c215 devices: add reg-names to most devices 2017-06-28 15:06:16 -07:00
Wesley W. Terpstra
852f03282f rocket: give itim and dtim a compatible field for drivers to match 2017-06-28 14:26:55 -07:00
Henry Cook
5552f23294 tims: explictly name them for generated address map 2017-06-20 17:18:29 -07:00
Colin Schmidt
675f183dd2 refactor ICache to be reusable by other frontends (#808) 
* refactor ICache to be reusable by other frontends

specifically one that would like to change the fetch width and number of
bytes in an instruction
 2017-06-20 08:21:01 -07:00
Andrew Waterman
16ecbdd5b2 Reduce fanout on critical I$ miss signal 2017-06-02 20:45:50 -07:00
Wesley W. Terpstra
d25ad10592 diplomacy: require masters to have a name 2017-06-02 15:52:20 -07:00
Andrew Waterman
b2b4c1abcd Separate tag ECC and data ECC options (#761) 2017-05-23 12:51:48 -07:00
Scott Johnson
1b3b228790 ITIM supports PutPartial 2017-05-04 00:57:52 -07:00
Andrew Waterman
398600d4da Interlock to prevent ITIM hazard when tl.a.valid & tl.d.valid & !tl.d.ready 2017-05-04 00:57:29 -07:00
Andrew Waterman
d6e69066a5 Fix ITIM loads (#716) 
An incorrectly-set ready signal caused bad data to be read from the RAM.
 2017-05-01 17:41:25 -07:00
Andrew Waterman
dd85d7e0a0 I$: Don't raise io.resp.valid if io.s1_kill was high previous cycle 
@solomatnikov found the bug.  It doesn't manifest in Rocket because the
Frontend masks io.resp.valid with s2_valid.
 2017-04-28 16:44:58 -07:00
Henry Cook
e99fa057ac cleanup scratchpad nodes 2017-04-27 14:02:05 -07:00
Andrew Waterman
b2b4725522 Fix zero-width wire issues when ITIM is disabled 2017-04-26 22:43:00 -07:00
Andrew Waterman
e23ee274f6 Size hartid field with NTiles, not XLen 2017-04-26 20:11:43 -07:00
Andrew Waterman
dc753bfa95 Fix I$ elaboration when ITIM is disabled 2017-04-26 19:35:35 -07:00
Andrew Waterman
418879a47f Add Instruction Tightly Integrated Memory 2017-04-26 19:35:35 -07:00
Andrew Waterman
d24d8ff84b Don't stall the frontend, making it easier to add more features later 2017-04-24 02:01:15 -07:00
Andrew Waterman
061a0adceb Fetch smaller parcels from the I$ 2017-04-24 02:01:15 -07:00
Andrew Waterman
2e09253d26 Revive I$ parity option 
Pipeline the parity check into the second stage, so that the data
RAM access + parity check do not become the critical path.
 2017-04-05 21:46:55 -07:00
Andrew Waterman
43917dd59f Get I$ s1_kill signal off the critical path 2017-04-05 21:46:55 -07:00
Andrew Waterman
a8a2ee711c Give I$ RAMs consistent names 2017-03-30 15:50:54 -07:00
Andrew Waterman
70e7e90c02 Remove splitMetadata option from L1 caches 
This is a property of the specific cache microarchitecture, not actually
an independently tunable knob.
 2017-03-30 15:48:55 -07:00
Andrew Waterman
a03556220c Default TLB size = 32 
@davidbiancolin
 2017-03-24 16:39:52 -07:00
Wesley W. Terpstra
0c92283a61 rocket icache: tie off b ready 2017-03-19 17:18:50 -07:00
Andrew Waterman
11c8857b5d Don't re-read I$ RAMs on stall 2017-03-09 11:29:51 -08:00
Henry Cook
d0ae087587 rocket: allow scratchpad address to be configurable (#570) 2017-03-06 21:35:45 -08:00
Wesley W. Terpstra
fd972f5c67 icache: back-pressure is unnecessary (#564) 
* icache: back-pressure is unnecessary
* icache: require that the response arrives after the request
 2017-02-24 21:01:56 -08:00