riscv/rocket-chip
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Author SHA1 Message Date
Howard Mao
dcfcac9530 fix LRSC issue (RocketChip issue #86) 
It was possible that the result of a store-conditional could get lost if it
did not depend on the result of the corresponding load-reserved.

This was because the MSHR does not update the client state based on the
secondary requests. So the LR would acquire the line in clientExcusiveClean,
but then we would fail to update the metadata array to change the state
to clientExclusiveDirty.

The solution is to track whether a secondary acquire would cause the
line to be dirty. If so, use M_XWR instead of the primary command to
generate the update coherence state.
 2016-07-26 18:41:52 -07:00
Howard Mao
51edd19e85 add U bit to misa register 2016-07-22 14:22:59 -07:00
Colin Schmidt
a43ad522dc add clock override to tile constructor (#42) 
useful to have upstream so that tape-outs can construct
rocket-chip to have cores on different clocks without
forking rocket
 2016-07-21 17:56:52 -07:00
Ben Keller
c069e66056 Modify the RoCC interface to include status in the command queue. (#41) 
This addresses a bug in which changes in mstatus could
propagate to RoCCs before their time. Existing RoCCs that use
the status port will need to be modified to match this change.

This addresses the first half of #40.
 2016-07-18 17:40:50 -07:00
Howard Mao
2723b2f515 fix issues in SimpleHellaCacheIF and document the changes 2016-07-18 17:02:47 -07:00
Howard Mao
40a146f625 HellaCacheArbiter passes through if n == 1 2016-07-18 17:01:29 -07:00
mwachs5
cff8de9814 Use new Mul/Div parameters vs UseFastMulDiv (#48) 
* Use new Mul/Div parameters vs UseFastMulDiv

* Rename MulDivUnroll to MulUnroll
 2016-07-15 15:41:20 -07:00
Andrew Waterman
7cf44f9b25 clean up WideCounter implementation 2016-07-15 00:51:01 -07:00
Andrew Waterman
d78f1aacd0 Clean up some zero-width wire cases using UInt.extract 2016-07-14 22:08:01 -07:00
Andrew Waterman
da512d4230 Explicitly discard BTB index LSBs 2016-07-14 17:10:27 -07:00
Andrew Waterman
e6aab368a4 Replace ICacheBufferWays parameter with I$ constructor argument 2016-07-14 12:38:54 -07:00
Andrew Waterman
3d0b92afd7 Misc code cleanup 2016-07-14 12:09:34 -07:00
Andrew Waterman
b8884e8143 Simplify frontend virtual address extension code 2016-07-14 12:05:09 -07:00
Andrew Waterman
1699622730 Don't speculatively refill I$ in uncacheable regions 2016-07-09 01:10:58 -07:00
Howard Mao
f7b392306e make sure SimpleHellaCacheIF can work with blocking DCache 2016-07-07 18:59:23 -07:00
Andrew Waterman
3d8939d3c3 Set misa.base = 1 for RV32 2016-07-07 15:32:21 -07:00
Andrew Waterman
2455a806af Make WFI instruction respect mie CSR setting 2016-07-07 15:31:17 -07:00
Andrew Waterman
35a983275e Guarantee one-hotness of BTB entries 2016-07-06 15:58:01 -07:00
Andrew Waterman
c0e6ecebfc Fix BTB perf bug 
In rare cases, it would replace into a different row than it recorded.
 2016-07-06 03:16:05 -07:00
Andrew Waterman
f3e22984d5 Remove uarch counters 
These will be replaced with the indirect TDR scheme used by breakpoints.
 2016-07-06 01:41:41 -07:00
Andrew Waterman
25fdabdd59 Don't implicitly create Vecs, since they're heavyweight 2016-07-06 01:41:31 -07:00
Andrew Waterman
8bd7e3932b Implement priv-1.9 PTE scheme 2016-07-05 19:19:49 -07:00
Andrew Waterman
ebefe57036 simplify BTB fetchWidth=1 special case 2016-07-04 23:43:47 -07:00
Andrew Waterman
2d325df60c Improve PTW simulation performance 2016-07-02 14:34:18 -07:00
Andrew Waterman
5aa8ef1855 Remove invalidation support from BTB 
Validating the target PC in the pipeline is cheaper than maintaining
the valid bits and control logic to guarantee the BTB won't ever
mispredict branch targets.
 2016-07-02 14:27:29 -07:00
Andrew Waterman
663002ec0c Improve TLB simulation performance 2016-07-02 14:26:05 -07:00
Howard Mao
a9e0a5e2df changes to imports after uncore refactor 2016-06-28 14:09:31 -07:00
Andrew Waterman
c10691b616 Don't take interrupts on instructions in branch shadow 
In situations like

       j 1f
       nop
    1: nop

the interrupt could be taken on the first nop.
 2016-06-28 12:47:49 -07:00
Andrew Waterman
a70dee17ea Make RoCC energy-saving logic mirror same for D$ 2016-06-28 12:47:45 -07:00
Andrew Waterman
6f85056494 Remove reliance on HtifKey 2016-06-23 13:18:51 -07:00
Andrew Waterman
6d43c0a945 Mask interrupts during single-step 2016-06-23 00:01:06 -07:00
Andrew Waterman
5644a2703a Avoid need for FENCE.I in debug programs 
This is a hack to work around caching the (uncacheable) debug RAM.  The
RAM is always entered with a JALR, so flush the I$ on any debug-mode JALR.
 2016-06-23 00:01:06 -07:00
Andrew Waterman
7f88a00a38 Always verify BTB result; don't bother flushing it 
This improves CPI for things like

    lbu t0, (t0)
    j foo
    addi t0, t0, 1

where the addi would stall, causing j's misprediction check to fail,
flushing the pipeline.
 2016-06-23 00:01:06 -07:00
Howard Mao
4c31248917 make sure UseAtomics is on when PTW is being used 2016-06-22 16:09:45 -07:00
Howard Mao
d1c83ccda0 change Tile interface to allow arbitrary number of cached and uncached channels 2016-06-20 09:55:30 -07:00
Andrew Waterman
60bddddfe6 Merge sptbr and sasid 2016-06-17 18:29:05 -07:00
Andrew Waterman
0b4c8e9af7 Add D-mode single-step support 2016-06-15 16:21:24 -07:00
Colin Schmidt
e3816d5fc7 set invalidate_lr in other rocc examples (#47) 
This should fix https://travis-ci.org/ucb-bar/rocket-chip/jobs/137607305
 2016-06-14 16:59:37 -07:00
Andrew Waterman
e3b4b55836 Refactor breakpoints and support range comparison (currently disabled) 2016-06-10 19:55:58 -07:00
Andrew Waterman
c8c7246cce Update breakpoint spec 2016-06-09 19:07:21 -07:00
Colin Schmidt
2c325151bf pass invalidate_lr through simple cache interface (#45) 2016-06-09 17:22:36 -07:00
Andrew Waterman
586c1079d0 Fix D$ for set size > page size 2016-06-09 13:02:28 -07:00
Andrew Waterman
dca55a2b35 Respect breakpoint privilege settings 2016-06-09 12:41:52 -07:00
Andrew Waterman
c85ea7b987 Set badaddr on breakpoints 2016-06-09 12:33:43 -07:00
Andrew Waterman
4cd77cef10 Make dcsr.halt writable 2016-06-09 12:30:09 -07:00
Colin Schmidt
8516e38eb2 remove implicit modulo addressing in FPU (#44) 2016-06-09 11:33:33 -07:00
Andrew Waterman
e3c17b5f74 Add provisional breakpoint support 2016-06-08 20:19:52 -07:00
Andrew Waterman
4f2e2480a8 When exceptions occur in D-mode, set pc=0x808, not 0x800 
Closes #43
 2016-06-06 20:57:22 -07:00
Andrew Waterman
3b0c1ed0c3 Cope with changes to AddrMap 2016-06-03 13:50:29 -07:00
Andrew Waterman
13386af1d1 Get rid of unused implicit conversion 2016-06-01 19:30:41 -07:00