riscv/rocket-chip
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5aa8ef1855091c7d82a7cc06a758805ff31f0021
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1094 Commits

Author SHA1 Message Date
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
Andrew Waterman
9949347569 First stab at debug interrupts 2016-06-01 16:57:10 -07:00
Andrew Waterman
51379621d6 Flush blocking D$ on FENCE.I 2016-05-31 19:27:28 -07:00
Andrew Waterman
3ee5144923 Fix TLB tag check logic when ASIDs are present 2016-05-27 12:24:17 -07:00
Andrew Waterman
c104b57c52 Use BitPat implicit conversion in instruction decoder 2016-05-26 22:23:21 -07:00
Andrew Waterman
96fa1eb6ad Add UInt->BitPat implicit conversion 
This will be removed from Chisel3, so we're putting it here to maintain
compatibility.
 2016-05-26 18:52:53 -07:00
Andrew Waterman
0c50bfcfb3 Work around more zero-width wire cases 2016-05-25 21:47:48 -07:00
Andrew Waterman
40f38dde63 Work around lack of zero-width wires in D$ 2016-05-25 19:44:31 -07:00
Andrew Waterman
00ea9a7d82 Remove most of mstatus when user mode isn't supported 2016-05-25 15:37:32 -07:00
Andrew Waterman
5442b89664 Remove unnecessary muxes in RV32 MulDiv 2016-05-25 14:27:02 -07:00
Andrew Waterman
9aa724706e Don't include RV64 instructions in RV32 decode table 2016-05-25 14:26:45 -07:00
Andrew Waterman
4605b616c1 Fix bug in D$ AMO/storegen logic 2016-05-24 16:26:07 -07:00
Andrew Waterman
5dac7b818d Support set associativity in blocking D$ 2016-05-24 15:45:52 -07:00
Andrew Waterman
e0addb5723 Support uncached AMOs in blocking D$ 2016-05-24 15:45:35 -07:00
Andrew Waterman
f14d87e327 Support larger I$ sets when VM is disabled 2016-05-24 15:44:59 -07:00
Andrew Waterman
3b35c7470e Add uncached support to blocking D$ 2016-05-24 15:05:41 -07:00
Andrew Waterman
42f079ce57 JAL requires DW_XPR 
This has been benign so far because of how the logic minimization worked.
 2016-05-24 15:05:41 -07:00
Andrew Waterman
b92c73e361 Add LR/SC to blocking D$ 2016-05-24 15:05:41 -07:00
Andrew Waterman
0d93d1a1a0 Clean up pending store logic a bit 2016-05-24 15:05:41 -07:00
Andrew Waterman
0b8de578d4 Add additional D$ store buffering to prevent structural hazards 2016-05-24 15:05:41 -07:00
Andrew Waterman
354cb2d5ec Don't stall I$ response when resolving a branch misprediction 
This avoids a fetch bubble.

Not clear if this is the best way to do it.  Perhaps this change should
instead be made to Frontend (i.e., ignore resp.ready when req.valid is
high), but that might exacerbate a critical path.
 2016-05-24 15:05:41 -07:00
Andrew Waterman
d7790ac6a4 WIP on blocking D$ 2016-05-24 15:05:41 -07:00
Andrew Waterman
335e2c8a1e Support disabling atomics extension 2016-05-24 15:05:41 -07:00
Andrew Waterman
765b90f6a4 Stall on D$ lockups less conservatively 2016-05-24 15:05:41 -07:00
Andrew Waterman
a3061047e3 Instantiate blocking D$ when NMSHRS=0 2016-05-24 15:05:41 -07:00