riscv/rocket-chip
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Author SHA1 Message Date
Andrew Waterman 78b2e947de Chisel3 compatibility fixes 2015-09-11 15:43:07 -07:00
Andrew Waterman 1718333f83 Don't use Vec as lvalue 2015-08-05 15:29:33 -07:00
Andrew Waterman 546205b174 Chisel3 compatibility: use >>Int instead of >>UInt 2015-08-05 15:29:03 -07:00
Andrew Waterman fb5524372d bump scala to 2.11.6 2015-08-03 19:51:08 -07:00
Andrew Waterman d4c94c6566 Chisel3 has different Vec semantics 
Vec(a, b) := c doesn't modify a and b in chisel3.
 2015-08-03 19:08:00 -07:00
Andrew Waterman c345d72af4 Chisel3: Flip order of := and <> 2015-08-03 18:53:09 -07:00
Andrew Waterman ef319edc84 Bits -> UInt 2015-08-02 21:03:42 -07:00
Andrew Waterman 52fc34a138 Chisel3: bulk connect is not commutative 
We haven't decided if this is a FIRRTL limitation that we should relax,
or a backwards incompatibility we're forced to live with.  Should make
for lively debate.
 2015-08-01 21:11:25 -07:00
Andrew Waterman 6c0e1e33ab Purge UInt := SInt assignments 2015-07-31 15:42:10 -07:00
Andrew Waterman 6d7cc37e87 Specify some uninferrable widths 
It's really scary that Chisel2 passed this stuff.
 2015-07-31 14:23:52 -07:00
Andrew Waterman 45cf64dbd7 Use UInt instead of Vec[Bool] 2015-07-31 04:59:45 -07:00
Andrew Waterman 57930e8a26 Chisel3 compatibility potpourri 2015-07-30 23:53:02 -07:00
Andrew Waterman ce161b83e3 Chisel3 compatibility: avoid subword assignment 2015-07-29 15:03:13 -07:00
Andrew Waterman c8c312e860 minor btb cleanup 2015-07-29 15:03:01 -07:00
Andrew Waterman a2fdcdcaef Use Seq, not Iterable, when traversal order matters 2015-07-29 00:24:58 -07:00
Andrew Waterman 431dd2219b Another Bits -> BitPat 2015-07-28 20:13:56 -07:00
Andrew Waterman 049fc8dc24 Chisel3 compatibility: use BitPat for don't-cares 
This one's hella ugly, but for the time being, idgaf.
 2015-07-28 02:48:49 -07:00
Andrew Waterman f2dcc40e67 Chisel3 compatibility changes 2015-07-27 12:42:20 -07:00
Andrew Waterman ae73e3a997 Only instantiate div/sqrt unit if requested 2015-07-22 22:18:18 -07:00
Andrew Waterman e9433ee01e Minor cleanup 2015-07-22 17:38:08 -07:00
Andrew Waterman b4e4ceed3d Factor out some more hazard detection code 2015-07-22 15:52:13 -07:00
Andrew Waterman bd785e7d19 Factor out common hazard detection code 2015-07-22 15:46:20 -07:00
Andrew Waterman cc447c8110 Refactor pipeline RTL (merge ctrl + dpath into rocket) 2015-07-21 17:10:56 -07:00
Andrew Waterman ac6e73e317 Add Wire() wrap 2015-07-15 20:24:18 -07:00
Andrew Waterman 5b7f3c3006 Don't use clone 2015-07-15 17:30:50 -07:00
Andrew Waterman be2ff6dec7 Vec(Reg) -> Reg(Vec) 2015-07-15 12:33:46 -07:00
Andrew Waterman a78e28523c Chisel3: Don't mix Mux types 2015-07-11 14:06:08 -07:00
Andrew Waterman 3233867390 Use Chisel3 SeqMem construct 2015-07-11 13:34:57 -07:00
Andrew Waterman 5362e2bbbd New machine-mode timer facility 2015-07-05 16:38:49 -07:00
Andrew Waterman 5e009ecc75 Fix an apparently benign PC sign-extension bug 2015-06-11 16:08:39 -07:00
Andrew Waterman 6a9390c50e Avoid spurious D$ assertion failures 
For the Rocket pipeline, this fix is needless and the problem is that the
assertion is too conservative, but I solved it this way to avoid problems
for other plausible use cases where physical and virtual accesses are
intermixed.
 2015-05-19 03:00:53 -07:00
Andrew Waterman f460cb6c54 Update to privileged architecture 1.7 2015-05-19 02:32:21 -07:00
Andrew Waterman 254498042a Fix Split for 0-width wires 2015-05-18 18:23:17 -07:00
Andrew Waterman d31b26c342 Clean up handling of icache's io.cpu.npc signal 2015-05-18 18:22:48 -07:00
Andrew Waterman 9ade0e41cc Integrate divide/sqrt unit 2015-04-04 16:39:17 -07:00
Andrew Waterman fe27b9b1b2 Support writing sstatus.fs even without an FPU 2015-04-04 15:20:18 -07:00
Andrew Waterman bce62d5774 Update PTE format to reflect reserved bits 2015-04-04 15:19:15 -07:00
Andrew Waterman d912ea265e New virtual memory implementation (Sv39) 2015-03-27 16:20:59 -07:00
Andrew Waterman faada5f110 Mask off LSBs of sepc/mepc/stvec 
Therefore, they cannot generate misaligned instruction exceptions.
When a misaligned instruction exception does occur, mbadaddr
retains the misaligned PC bits, so no information is actually lost.
 2015-03-25 00:20:58 -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 90b31586ff Misc. CSR fixes/improvements 
- Support RV32 mstatus register
- Don't ignore mstatus.stie bit
- Support custom M-mode R/W CSRs for Raven chip
 2015-03-24 23:50:18 -07:00
Andrew Waterman 822698b567 support disabling supervisor mode (via UseVM parameter) 2015-03-24 19:32:45 -07:00
Andrew Waterman 0332c1e7fe Reduce latency of page table walks 
A small cache in the PTW caches non-leaf PTEs, reducing latency and D$ misses.
 2015-03-24 18:58:38 -07:00
Andrew Waterman 31d17cbf86 Hard-wire LSB of JALR to 0, as sent to BTB 2015-03-21 00:16:34 -07:00
Andrew Waterman 66388be1ce Merge [shm]call into ecall, [shm]ret into eret 2015-03-17 02:24:41 -07:00
Andrew Waterman 2c875555a2 Separate exception return control from exception control 2015-03-17 00:14:32 -07:00
Andrew Waterman e85c54cc4b New privileged ISA implementation 2015-03-14 02:49:07 -07:00
Andrew Waterman 7bb7299018 Don't pollute BTB with PC+4 target predictions 2014-10-14 17:28:37 -07:00
Andrew Waterman cde7c9d869 simplify CSR decoding code 2014-10-03 14:31:26 -07:00
Andrew Waterman a999c055ed Don't take an interrupt when EX stage PC is invalid 
It was possible to take an interrupt on the instruction in the shadow of
a short forward branch.  EPC would thus get the wrong value, and so
a wrong-path instruction would be executed upon return from interrupt.

h/t Yunsup
 2014-09-11 01:46:52 -07:00
Andrew Waterman 81c752de84 Support disabling virtual memory 2013-09-24 13:58:47 -07:00
Andrew Waterman adc386f889 Turn off virtual memory inside RoCC base class 2013-09-24 13:58:47 -07:00
Andrew Waterman 1d2f4f8437 New ISA encoding, AUIPC semantics 2013-09-21 06:32:40 -07:00
Andrew Waterman 25ab402932 swap JAL, JALR encodings 2013-09-15 04:29:06 -07:00
Andrew Waterman 110e53cb48 Revert "Add early out to multiplier" 
This broke recently and I don't have time to figure out why.
 2013-09-15 04:15:32 -07:00
Andrew Waterman 88d1c47665 don't disassemble within chisel 2013-09-15 04:14:45 -07:00
Andrew Waterman f12bbc1e43 working RoCC AccumulatorExample 2013-09-14 22:34:53 -07:00
Andrew Waterman 18968dfbc7 Move store data generation into cache 2013-09-14 16:15:07 -07:00
Andrew Waterman a0cb711451 Start adding RoCC 2013-09-14 15:31:50 -07:00
Andrew Waterman d053bdc89f Remove Hwacha from Rocket 
Soon it will use the coprocessor interface.
 2013-09-12 22:34:38 -07:00
Andrew Waterman 1edb1e2a0a Ignore LSB of PC 2013-09-12 17:55:58 -07:00
Andrew Waterman 59f5358435 Implement AQ/RL; move fence logic out of cache 2013-09-12 16:07:30 -07:00
Andrew Waterman 243c4ae342 sync up rocket with new isa 2013-09-12 03:44:38 -07:00
Andrew Waterman 95dd0d8be1 Remove DebugIO/error mode 2013-09-11 20:15:21 -07:00
Andrew WatermanandYunsup Lee b9f6e1a7ec Don't update BTB when garbage was fetched 2013-08-26 14:53:04 -07:00
Andrew Waterman 3895b75a56 Support non-power-of-2 BTBs; prefer invalid entries 2013-08-24 17:33:11 -07:00
Andrew Waterman daf23b8f79 Add early out to multiplier 2013-08-24 14:44:23 -07:00
Andrew Waterman 67f80ba4b2 Stall div/mul writeback until WB slot is free 2013-08-24 14:44:17 -07:00
Andrew Waterman d1b5076fee Don't update BTB when garbage was fetched 2013-08-24 14:44:11 -07:00
Andrew Waterman 52e31f3298 Bypass scoreboard updates 
This reduces div/mul/D$ miss latency by 1 cycle.
 2013-08-24 14:44:04 -07:00
Andrew Waterman d4a0db4575 Reflect ISA changes 2013-08-24 14:43:55 -07:00
Andrew Waterman 7cc53c7725 clean up Str 2013-06-15 00:45:53 -07:00
Andrew Waterman 95c5147dc5 Add RISC-V instruction disassembler 2013-06-13 10:31:04 -07:00
Andrew Waterman fe9adfe71b Simplify and correct integer multiplier 2013-05-22 17:27:50 -07:00
Andrew Waterman 28f914c3f2 don't JALR to speculatively-bypassed addresses 
Technically not necessary, but probably improves performance.
 2013-05-21 16:56:58 -07:00
Andrew Waterman 3a1b5f01b2 don't take interrupts while they're disabled! 
a control bug allowed an interrupt to be taken on the instruction immediately
following an interrupt-disabling instruction (but not thereafter).
 2013-05-19 23:27:47 -07:00
Andrew Waterman 6eb4c2542a comment out I$ assert for now 2013-05-18 18:09:23 -07:00
Andrew Waterman 1dab984231 use UFix instead of Bits for arithmetic 2013-05-18 00:45:29 -07:00
Andrew Waterman dfa7a03f73 use assert, not Assert 2013-05-18 00:45:13 -07:00
Andrew Waterman d405ffa949 assume all I$ grants bear data 2013-05-01 21:01:20 -07:00
Andrew Waterman 474d321cc7 fix meta hazard counter to reset on new meta writes 2013-05-01 16:35:24 -07:00
Andrew Waterman a6a88fce19 Revert "broaden scope of s1_nack to include new probes accepted by the probe unit on that cycle" 
This reverts commit b41e6bc50519631ba097ac1196737be7107295f9.
 2013-05-01 16:34:45 -07:00
Andrew Waterman 63a38e7982 Revert "temp" 
This reverts commit 73705e6ed8f98d08ce6b30fbe760de694c6563ae.
 2013-05-01 16:34:33 -07:00
Andrew Waterman 1501e90c1f interlock probe unit on tag RAW hazards 2013-04-30 00:38:22 -07:00
Andrew Waterman 50ccc20bf3 replace RDNPC with AUIPC 2013-04-22 04:20:15 -07:00
Andrew Waterman ae7720e284 guarantee LR/SC forward progress 
the mechanism is to block new probes for several cycles after a successful LR.

this also cleans up the MSHR <-> ProbeUnit interface slightly.
 2013-04-07 19:27:21 -07:00
Andrew Waterman e74e032c87 simplify MSHR memory response logic 2013-04-06 01:03:37 -07:00
Andrew Waterman 1abb9277db fix LR/SC atomicity violation 
note, it's still not starvation-free.
 2013-04-05 19:13:38 -07:00
Andrew Waterman 8cbdeb2abf add LR/SC support 2013-04-04 17:07:09 -07:00
Andrew Waterman fc46daecf6 don't flush pipeline on writes to side-effect-free PCRs 
notably, K0, K1, and EPC
 2013-04-04 17:07:09 -07:00
Andrew Waterman 8b439ef20d only support setpcr/clearpcr of SR 
the full PCR RMW support was wasted area/power
 2013-04-04 17:07:08 -07:00
Andrew Waterman d43f484feb take interrupts on nonzero fromhost values 2013-04-04 17:07:08 -07:00
Andrew Waterman d4a3351cfc expose pending interrupts in status register 2013-04-04 17:07:08 -07:00
Andrew Waterman 35349d227f update to new Mem style 2013-02-20 16:09:46 -08:00
Andrew Waterman 9f89c812b7 fix HTIF memory size reporting 2013-01-29 23:08:25 -08:00
Andrew Waterman 66eb3720a4 fix SRAM semantics bug in HellaFlowQueue 2013-01-29 21:16:42 -08:00
Andrew Waterman 6275e009f8 fix HellaQueue deq.valid signal 2013-01-28 20:57:43 -08:00
Andrew Waterman 45d8066f45 add HellaQueue, an SRAM-based queue 2013-01-28 20:54:25 -08:00
Andrew Waterman 37c67f1d87 pipeline reset to the vector unit 2013-01-28 17:56:32 -08:00
Andrew Waterman c890099e09 add System Control Register space to HTIF 2013-01-24 23:41:24 -08:00