riscv/rocket-chip
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Author SHA1 Message Date
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
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
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
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
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
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
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
Andrew Waterman 80482890fd Don't rely on tag value for nacks 2016-05-24 15:05:41 -07:00
Andrew Waterman 7bc38383de add (non-working) blocking data cache 2016-05-20 18:59:05 -07:00
Andrew Waterman 4aef567a80 Fix MMIO bug: replay_next wasn't set 2016-05-13 17:59:53 -07:00
Andrew Waterman 742c05d6a7 Pipeline D$->I$ control paths 
These stretch the miss latency by a cycle in exchange for slack.
The current implementation also adds a cycle to mul/div latency,
which can be worked around for more hardware (possibly gated by
the FastMulDiv option).
 2016-05-13 17:07:28 -07:00
Andrew Waterman 9dd23a603a Remove HTIF port 2016-05-03 13:41:58 -07:00
Andrew Waterman 5352497edb MPRV takes effect regardless of privilege mode 2016-05-02 19:53:25 -07:00
Andrew Waterman f784f4da93 Rename PRCICoreIO to PRCITileIO 2016-05-02 18:08:01 -07:00
Andrew Waterman 000e20f937 Remove MIPI; make mip.MSIP read-only 
The PRCI block outside the core will provide IPIs eventually
 2016-05-02 15:18:41 -07:00
Andrew Waterman 83fa489cef Stop using HTIF CSR port 
The port itself is still present to keep other stuff compiling.
 2016-05-02 14:40:52 -07:00
Andrew Waterman 491184a8f8 ERET -> xRET; remove mcfgaddr 2016-04-30 17:32:51 -07:00
Andrew Waterman 5af98145b9 don't signal bad physical address on TLB miss 2016-04-30 17:31:46 -07:00
Andrew Waterman cae4265f3b Change mcfgaddr pointer 2016-04-28 16:14:05 -07:00
Andrew Waterman 739cf07637 Remove mtime/mtimecmp 
The RTC is now a device that lives on the MMIO bus.
 2016-04-27 14:54:51 -07:00
Andrew Waterman fb5c38c186 Handle invalidate_lr in cache arbiter, not tile 2016-04-27 11:22:04 -07:00
Andrew Waterman b99db83e67 Avoid needless Vec generation 2016-04-27 00:28:39 -07:00
Andrew Waterman 8acec8eb36 Remove dead code from BTB 2016-04-27 00:28:12 -07:00
Andrew Waterman fe8c91f620 Fix IOMSHR state machine bug 
Sending the finish too early causes the CPU response to get dropped.

attn @zhemao
 2016-04-26 15:32:25 -07:00
Andrew Waterman 5fd5b58743 Remove stats CSR 2016-04-26 15:31:32 -07:00
Andrew Waterman d93677a343 Support larger cache sets when not using VM 2016-04-26 15:31:32 -07:00
Andrew Waterman 84fd45fd77 Pass TLB flush signal to I$ explicitly 2016-04-22 15:20:17 -07:00
Andrew Waterman 51e0870e23 Separate I$ and D$ interface signals that span clock cycles 
For example, Decopuled[HellaCacheReq].bits.kill doesn't make sense,
since it doesn't come the same cycle as ready/valid.
 2016-04-01 19:30:39 -07:00
Andrew Waterman dc662f28a0 Specify width on s1_pc to avoid width inference problem 2016-04-01 17:28:42 -07:00
Andrew Waterman 72f7f71eb5 No need to allow finishes to be sent in s_refill_resp state 
This is a hold-over from when writebacks needed finish messages.
 2016-04-01 16:19:57 -07:00
Andrew Waterman 37b9051762 No need to validate npc if BTB is disabled 2016-04-01 15:54:57 -07:00
Andrew Waterman 4480d1e817 Don't compile BTB when nEntries=0 2016-04-01 15:14:45 -07:00
Andrew Waterman d406dc1231 Remove vestigial BTB enable option 2016-04-01 15:14:34 -07:00
Andrew Waterman adb7eacf6e Fix Chisel3 build for XLen=32 2016-03-30 22:48:51 -07:00
Andrew Waterman 70664bbca0 Fix Chisel3 build for UseVM=false 2016-03-30 22:48:31 -07:00
Andrew Waterman 8ad8e8a691 Add partial Sv48/Sv57 support 
Right now, we don't support Sv39 and Sv48 at the same time, which needs
to change.
 2016-03-30 11:02:22 -07:00
Andrew Waterman e652821962 Use correct kind of TileLink arbiter 
It was "correct" before, but broke Chisel3 build.
 2016-03-28 22:53:47 -07:00
Andrew Waterman ed280fb3de Remove empty when statement (???) 2016-03-25 15:52:18 -07:00
Andrew Waterman 1ae6d09751 Slightly ameliorate D$->I$ critical path via scoreboard 2016-03-25 15:29:32 -07:00
Andrew Waterman a4685a073f Don't instantiate PTW when UseVM=false 2016-03-25 14:17:25 -07:00
Andrew Waterman 27b3cca046 Discover D$, PTW port counts dynamically 
This is a generator, after all...
 2016-03-25 14:16:56 -07:00
Andrew Waterman 8d1ba4d1ec Remove hard-coded XLEN values from D$ 2016-03-24 14:52:12 -07:00
Andrew Waterman 7ae44d4905 Add RV32 support 2016-03-10 17:32:00 -08:00
Andrew Waterman 82c595d11a Fix no-FPU elaboration of CSR file 2016-03-10 17:30:56 -08:00
Andrew Waterman bc15e8649e WIP on priv spec v1.9 2016-03-02 23:29:58 -08:00
Andrew Waterman 58fcc6b7c6 Get rid of useless mux 2016-01-28 11:44:59 -08:00
Andrew Waterman 52d6b0b1a5 Improve ALU QoR 
Rejigger muxes; share XOR gates between ADD/SUB, XOR, and BEQ.
 2016-01-20 17:42:31 -08:00