riscv/rocket-chip
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4b6cd7f3eb
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139 Commits

Author SHA1 Message Date
Colin Schmidt
4b6cd7f3eb Merge branch 'master' of ucb-bar/rocket into rocc-fpu-port for priv1.7 2015-06-03 15:51:53 -07:00
Andrew Waterman
d31b26c342 Clean up handling of icache's io.cpu.npc signal 2015-05-18 18:22:48 -07:00
Christopher Celio
b09832f1b5 ICache now returns the "next PC" signal. 
useful for other modules that need access to the fetch PC on the
   cycle it is sent to the SRAM.
 2015-05-07 04:53:05 -07:00
Colin Schmidt
a37fad2e9b Merge branch 'retimeable-frontend' into rocc-fpu-port 2015-04-22 14:23:52 -07:00
Colin Schmidt
1f410ac42c move fetch buffer into frontend to allow retiming 2015-04-22 11:26:03 -07:00
Henry Cook
3048f4785a HeaderlessTileLinkIO -> ClientTileLinkIO 2015-04-17 16:56:53 -07:00
Henry Cook
49f1c0aa7b moved ecc lib to uncore 2015-04-13 15:58:10 -07:00
Henry Cook
91e882e3f8 Use HeaderlessTileLinkIO 2015-04-13 15:58:10 -07:00
Christopher Celio
517d0d4b89 feedback on PR 2015-04-12 18:44:03 -07:00
Christopher Celio
11dbd4221a Fixed front-end to support four-wide fetch. 2015-04-10 17:53:47 -07:00
Andrew Waterman
543ac91cf2 Misaligned fetches can't happen at the I$ anymore 
They are caught before the I$ ever sees them, so leverage that fact.
 2015-03-24 23:55:43 -07:00
Andrew Waterman
e85c54cc4b New privileged ISA implementation 2015-03-14 02:49:07 -07:00
Henry Cook
95aa295c39 Use HeaderlessTileLinkIO to cut down on unconnected port errors in VCS 2015-03-09 16:34:43 -07:00
Christopher Celio
5d07733057 Removed TLBPTWIO from the io.cpu bundle for icache/dcache 2015-03-03 16:40:39 -08:00
Henry Cook
1e0c16c557 new metadata api 2015-02-28 17:00:32 -08:00
Henry Cook
741e6b77ad Rename some params, use refactored TileLink 2015-02-01 20:37:31 -08:00
Andrew Waterman
b70f7683d3 Merge branch 'master' into ss-frontend 
Conflicts:
	src/main/scala/ctrl.scala
 2015-01-04 19:59:18 -08:00
Andrew Waterman
2aee85cb11 Flush pipeline from MEM stage 
This means we no longer have to rely on the instruction behind a serializing
instruction being valid, simplifying the control.  But we have to be a
little more cautious when flusing the I$/ITLB/BTB.
 2015-01-04 16:40:16 -08:00
Henry Cook
1cb65d5ec1 %s/master/manager/g 2014-12-29 22:56:18 -08:00
Henry Cook
08dcf4c6ca refactor cache params 2014-12-17 14:28:05 -08:00
Henry Cook
72ea24283b multibeat TL; passes all tests 2014-12-12 16:54:33 -08:00
Christopher Celio
6749f67b7f Fixed BHT update error. 
- separated out BTB/BHT update
   - BHT updates counters on every branch
   - BTB update only on mispredicted and taken branches
 2014-11-16 22:02:27 -08:00
Henry Cook
c9e7874818 Major tilelink revision for uncached message types 2014-11-11 17:36:48 -08:00
Christopher Celio
fea31d2167 Significant changes and fixes to BTB for superscalar fetch. 
- BTBUpdate only occurs on mispredicts now.
   - RASUpdate broken out from BTBUpdate (allows RASUpdate to be performed in
      Decode).
   - Added optional 2nd CAM port to BTB for updates (for when updates to the
      BTB may occur out-of-order).
   - Fixed resp.mask bit logic.
 2014-11-11 03:34:05 -08:00
Christopher Celio
3be3cd7731 Fixed error with icache/btb resp mask. 2014-11-03 01:13:22 -08:00
Christopher Celio
08d2c13330 Fixed btb/icache bugs regarding resp mask, fw==1 2014-10-20 18:45:23 -07:00
Christopher Celio
91efdc379b Merge remote-tracking branch 'origin/master' into ss-frontend 
Also fixed bridx logic and zero-width wire logic.

Conflicts:
	src/main/scala/btb.scala
 2014-10-14 18:10:29 -07:00
Christopher Celio
99614e37aa Merge remote-tracking branch 'origin/master' into ss-frontend 
Conflicts:
	src/main/scala/btb.scala
	src/main/scala/core.scala
 2014-10-03 04:22:58 -07:00
Christopher Celio
9cc35dee9a Returned history update to fetch. 
- Global history only contains branches.
   - Only update BHT and history on BTB hits.
   - Gate off speculative update on stall or icmiss.
   - Fixed bug where BHT updates were delayed a cycle.
 2014-09-29 21:41:07 -07:00
Christopher Celio
8ccd07cfeb Moved updating global history from fetch to decode. 
- No longer update global history in fetch stage.
   - Only update global history when instruction is a branch.
   - Does allow for the possibility of back-to-back branches to see
     slightly different histories on subsequent executions.
 2014-09-28 05:16:36 -07:00
Christopher Celio
681b43f398 Bug fixes with global history register. 
- Updated in fetch speculatively.
      * Updates gated off by cpu.resp.fire().
      * BTB direction factored into history update.
   - All branches update the BHT.
   - Each instruction carries history; index into BHT is recomputed by
     passing in mem_reg_pc.
 2014-09-26 10:39:57 -07:00
Christopher Celio
180d3d365d Expanded front-end to support superscalar fetch. 2014-09-17 14:24:03 -07:00
Yunsup Lee
8abf62fae3 add LICENSE 2014-09-12 18:06:41 -07:00
Henry Cook
b42a2ab40a Final parameter refactor 2014-09-01 13:28:58 -07:00
Henry Cook
6a4193cf90 minor cache param cleanup 2014-08-19 11:38:46 -07:00
Henry Cook
2de268b3b1 Cache utility traits. Completely compiles, asm tests hang. 2014-08-19 11:38:20 -07:00
Henry Cook
ca5f38ff26 a few more fixes. some param lookups fail (here() in Alter blocks) 2014-08-19 11:38:11 -07:00
Henry Cook
0dac9a7467 Full conversion to params. Compiles but does not elaborate. 2014-08-19 11:38:02 -07:00
Andrew Waterman
4ca152b012 Use BundleWithConf to avoid clone method boilerplate 2014-05-09 19:37:16 -07:00
Henry Cook
1b156c6db9 TileLinkIO.GrantAck -> TileLinkIO.Finish 2014-04-26 15:18:21 -07:00
Henry Cook
1da8ef2ddf Added serdes to decouple cache row size from tilelink data size 2014-04-10 12:34:12 -07:00
Henry Cook
910b3b203a removed AddressSpaceConstants, CacheConstants, and TileLinkSizeConstants 2014-04-10 12:32:44 -07:00
Henry Cook
ebdc0a2692 merge Aqcuire and AcquireData. cache line size coupled to tilelink data size 2014-04-10 12:09:52 -07:00
Andrew Waterman
f235fa0db6 Move branch resolution to M stage 2014-04-07 15:58:49 -07:00
Andrew Waterman
db59fc65ab Add return address stack 2014-04-01 15:01:27 -07:00
Andrew Waterman
e3b12e0b85 Make BTB more complexity-effective 
BTB entries reference a small number of unique pages, so we separate the
storage of pages from indices.  This makes much larger BTBs feasible.  It's
easy to exacerbate cycle time this way, so one-hot encoding is used as needed.
 2014-03-25 05:22:04 -07:00
Andrew Waterman
804b09c8c5 Frontend QoR tweaks 2014-03-25 05:20:24 -07:00
Henry Cook
2c2b3a7678 cleanups supporting uncore hierarchy 2014-01-31 12:07:26 -08:00
Christopher Celio
a2be21361e Allow ICacheConfig to toggle fetch-width. 2014-01-22 16:19:57 -08:00
Andrew Waterman
65b8340cea Mitigate D$ hit -> branch -> NPC critical path 2013-11-24 14:21:03 -08:00