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Merge pull request #1254 from freechipsproject/amo-aqrl 

Fix mapping of acquire/release AMOs to fence operations
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Andrew Waterman 2018-02-27 19:49:40 -06:00 committed by GitHub
parent 86c10b3cef eb6e192ec0
commit a48dd575b2
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1 changed files with 3 additions and 3 deletions
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6
src/main/scala/rocket/RocketCore.scala
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@ -210,17 +210,17 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p)
id_ctrl.rocc && csr.io.decode(0).rocc_illegal ||
id_csr_en && (csr.io.decode(0).read_illegal || !id_csr_ren && csr.io.decode(0).write_illegal) ||
!ibuf.io.inst(0).bits.rvc && ((id_sfence || id_system_insn) && csr.io.decode(0).system_illegal)
// stall decode for fences (now, for AMO.aq; later, for AMO.rl and FENCE)
// stall decode for fences (now, for AMO.rl; later, for AMO.aq and FENCE)
val id_amo_aq = id_inst(0)(26)
val id_amo_rl = id_inst(0)(25)
val id_fence_next = id_ctrl.fence || id_ctrl.amo && id_amo_rl
val id_fence_next = id_ctrl.fence || id_ctrl.amo && id_amo_aq
val id_mem_busy = !io.dmem.ordered || io.dmem.req.valid
when (!id_mem_busy) { id_reg_fence := false }
val id_rocc_busy = Bool(usingRoCC) &&
(io.rocc.busy || ex_reg_valid && ex_ctrl.rocc ||
mem_reg_valid && mem_ctrl.rocc || wb_reg_valid && wb_ctrl.rocc)
val id_do_fence = Wire(init = id_rocc_busy && id_ctrl.fence ||
id_mem_busy && (id_ctrl.amo && id_amo_aq || id_ctrl.fence_i || id_reg_fence && (id_ctrl.mem || id_ctrl.rocc)))
id_mem_busy && (id_ctrl.amo && id_amo_rl || id_ctrl.fence_i || id_reg_fence && (id_ctrl.mem || id_ctrl.rocc)))
val bpu = Module(new BreakpointUnit(nBreakpoints))
bpu.io.status := csr.io.status