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Commit Graph

61 Commits

Author SHA1 Message Date
Henry Cook
996a31364a rocket: remove hard-coded paddrBits (#610)
Fall back on global variable but check that it is compatible with memory as seen from rocket's tilelink master port.
2017-03-24 22:30:18 -07:00
Andrew Waterman
0380aed329 PUM -> SUM 2017-03-24 16:39:52 -07:00
Andrew Waterman
aace526857 WIP on PMP 2017-03-24 16:39:52 -07:00
Andrew Waterman
24a2278fc4 Perform all illegal-instruction detection in ID stage
This is simpler, reduces what would have become a critical path in
the commit stage, and will make it easier to support the mbadinst
CSR if it is implemented.
2017-03-09 11:29:51 -08:00
Andrew Waterman
db0a02b78e WIP on priv-1.10 2017-03-09 11:29:51 -08:00
Andrew Waterman
603b8af2eb Don't canonicalize 32-bit FP results in the various pipelines
It's redundant with the new scheme, so just adds HW for no reason.
2017-03-07 20:51:32 -08:00
Andrew Waterman
f505aba1ac Use sNaN value for flw, like other single-precision ops 2017-03-07 20:51:32 -08:00
Andrew Waterman
cc389bea90 Fix in-register representation of fdiv.s/fsqrt.s result
We were zero-extending it, which is a double-precision zero in the recoded
format.  So, when spilled and reloaded with fsd/fld, the original value
was destroyed.  Instead, set the MSBs so that it represents sNaN.  When
spilled, the single-precision number will be preserved as the NaN payload.
2017-03-07 20:51:32 -08:00
Henry Cook
d0ae087587 rocket: allow scratchpad address to be configurable (#570) 2017-03-06 21:35:45 -08:00
Wesley W. Terpstra
4535de2669 rocket: use diplomatic interrupts
This makes it possible for the PLIC to work with heterogenous cores.
2017-03-02 21:19:23 -08:00
Henry Cook
e8c8d2af71 Heterogeneous Tiles (#550)
Fundamental new features:

* Added tile package: This package is intended to hold components re-usable across different types of tile. Will be the future location of TL2-RoCC accelerators and new diplomatic versions of intra-tile interfaces.
* Adopted [ModuleName]Params convention: Code base was very inconsistent about what to name case classes that provide parameters to modules. Settled on calling them [ModuleName]Params to distinguish them from config.Parameters and config.Config. So far applied mostly only to case classes defined within rocket and tile.
* Defined RocketTileParams: A nested case class containing case classes for all the components of a tile (L1 caches and core). Allows all such parameters to vary per-tile.
* Defined RocketCoreParams: All the parameters that can be varied per-core.
* Defined L1CacheParams: A trait defining the parameters common to L1 caches, made concrete in different derived case classes.
* Defined RocketTilesKey: A sequence of RocketTileParams, one for every tile to be created.
* Provided HeterogeneousDualCoreConfig: An example of making a heterogeneous chip with two cores, one big and one little.
* Changes to legacy code: ReplacementPolicy moved to package util. L1Metadata moved to package tile. Legacy L2 cache agent removed because it can no longer share the metadata array implementation with the L1. Legacy GroundTests on life support.

Additional changes that got rolled in along the way:

* rocket: 	Fix critical path through BTB for I$ index bits > pgIdxBits
* coreplex: tiles connected via :=*
* groundtest: updated to use TileParams
* tilelink: cache cork requirements are relaxed to allow more cacheless masters
2017-02-09 13:59:09 -08:00