clock gate integer datapath more aggressively
This commit is contained in:
Andrew Waterman
parent
cc067026a2
commit
5a7777fe4d
@ -111,7 +111,7 @@ class Core(implicit conf: RocketConfiguration) extends Component
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// hooking up vector memory interface
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dmem(2).req.valid := vu.io.dmem_req.valid
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dmem(2).req.bits := vu.io.dmem_req.bits
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dmem(2).req.bits.data := Reg(StoreGen(vu.io.dmem_req.bits.typ, Bits(0), vu.io.dmem_req.bits.data).data)
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dmem(2).req.bits.data := RegEn(StoreGen(vu.io.dmem_req.bits.typ, Bits(0), vu.io.dmem_req.bits.data).data, vu.io.dmem_req.valid && isWrite(vu.io.dmem_req.bits.cmd))
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vu.io.dmem_req.ready := dmem(2).req.ready
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vu.io.dmem_resp.valid := dmem(2).resp.valid
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@ -385,6 +385,7 @@ class Control(implicit conf: RocketConfiguration) extends Component
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val mem_reg_mem_val = Reg(resetVal = Bool(false))
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val mem_reg_xcpt = Reg(resetVal = Bool(false))
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val mem_reg_fp_val = Reg(resetVal = Bool(false))
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val mem_reg_vec_val = Reg(resetVal = Bool(false))
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val mem_reg_replay = Reg(resetVal = Bool(false))
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val mem_reg_replay_next = Reg(resetVal = Bool(false))
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val mem_reg_pcr = Reg(resetVal = PCR_N)
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@ -507,7 +508,7 @@ class Control(implicit conf: RocketConfiguration) extends Component
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ex_reg_mem_val := id_mem_val.toBool;
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ex_reg_valid := Bool(true)
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ex_reg_pcr := id_pcr
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ex_reg_wen := id_wen
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ex_reg_wen := id_wen && id_waddr != UFix(0)
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ex_reg_fp_wen := id_fp_val && io.fpu.dec.wen
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ex_reg_eret := id_eret.toBool;
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ex_reg_flush_inst := id_fence_i
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@ -521,7 +522,7 @@ class Control(implicit conf: RocketConfiguration) extends Component
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}
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// replay inst in ex stage
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val wb_dcache_miss = wb_reg_mem_val && (wb_reg_wen || wb_reg_fp_wen) && !io.dmem.resp.valid
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val wb_dcache_miss = wb_reg_mem_val && !io.dmem.resp.valid
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val replay_ex = wb_dcache_miss && ex_reg_load_use || mem_reg_flush_inst ||
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ex_reg_mem_val && !io.dmem.req.ready ||
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ex_reg_div_val && !io.dpath.div_rdy ||
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@ -549,8 +550,9 @@ class Control(implicit conf: RocketConfiguration) extends Component
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mem_reg_eret := Bool(false);
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mem_reg_mem_val := Bool(false);
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mem_reg_flush_inst := Bool(false);
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mem_reg_fp_val := Bool(false);
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mem_reg_replay_next := Bool(false)
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mem_reg_fp_val := Bool(false)
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mem_reg_vec_val := Bool(false)
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mem_reg_replay_next := Bool(false)
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mem_reg_xcpt := Bool(false)
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}
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.otherwise {
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@ -561,9 +563,10 @@ class Control(implicit conf: RocketConfiguration) extends Component
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mem_reg_eret := ex_reg_eret;
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mem_reg_mem_val := ex_reg_mem_val;
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mem_reg_flush_inst := ex_reg_flush_inst;
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mem_reg_fp_val := ex_reg_fp_val
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mem_reg_replay_next := ex_reg_replay_next
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mem_reg_mem_type := ex_reg_mem_type
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mem_reg_fp_val := ex_reg_fp_val
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mem_reg_vec_val := ex_reg_vec_val
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mem_reg_replay_next := ex_reg_replay_next
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mem_reg_mem_type := ex_reg_mem_type
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mem_reg_xcpt := ex_xcpt
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}
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@ -575,7 +578,7 @@ class Control(implicit conf: RocketConfiguration) extends Component
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(mem_reg_mem_val && io.dmem.xcpt.pf.st, UFix(11))))
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val fpu_kill_mem = mem_reg_fp_val && io.fpu.nack_mem
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val ll_wb_kill_mem = io.dpath.mem_ll_wb && (mem_reg_wen || mem_reg_fp_wen)
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val ll_wb_kill_mem = io.dpath.mem_ll_wb && (mem_reg_wen || mem_reg_fp_wen || mem_reg_vec_val || mem_reg_pcr != PCR_N)
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val replay_mem = ll_wb_kill_mem || mem_reg_replay || fpu_kill_mem
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val killm_common = ll_wb_kill_mem || take_pc_wb || mem_reg_xcpt || !mem_reg_valid
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ctrl_killm := killm_common || mem_xcpt || fpu_kill_mem
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@ -628,12 +631,12 @@ class Control(implicit conf: RocketConfiguration) extends Component
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}
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val sboard = new Scoreboard
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sboard.set(wb_reg_div_mul_val || wb_dcache_miss && io.dpath.wb_wen, io.dpath.wb_waddr)
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sboard.set((wb_reg_div_mul_val || wb_dcache_miss) && io.dpath.wb_wen, io.dpath.wb_waddr)
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sboard.clear(io.dpath.mem_ll_wb, io.dpath.mem_ll_waddr)
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val id_stall_fpu = if (HAVE_FPU) {
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val fp_sboard = new Scoreboard
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fp_sboard.set(wb_dcache_miss && wb_reg_fp_wen && !replay_wb || io.fpu.sboard_set, io.dpath.wb_waddr)
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fp_sboard.set((wb_dcache_miss && wb_reg_fp_wen || io.fpu.sboard_set) && !replay_wb, io.dpath.wb_waddr)
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fp_sboard.clear(io.dpath.fp_sboard_clr, io.dpath.fp_sboard_clra)
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fp_sboard.clear(io.fpu.sboard_clr, io.fpu.sboard_clra)
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@ -725,7 +728,7 @@ class Control(implicit conf: RocketConfiguration) extends Component
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io.imem.invalidate := wb_reg_flush_inst
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io.dpath.mem_load := mem_reg_mem_val && mem_reg_wen
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io.dpath.wb_load := wb_reg_mem_val && io.dpath.wb_wen
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io.dpath.wb_load := wb_reg_mem_val && wb_reg_wen
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io.dpath.ren2 := id_renx2.toBool;
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io.dpath.ren1 := id_renx1.toBool;
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io.dpath.sel_alu2 := id_sel_alu2.toUFix
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@ -25,46 +25,42 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
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// execute definitions
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val ex_reg_pc = Reg() { UFix() };
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val ex_reg_inst = Reg() { Bits() };
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val ex_reg_raddr1 = Reg() { UFix() };
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val ex_reg_raddr2 = Reg() { UFix() };
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val ex_reg_op2 = Reg() { Bits() };
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val ex_reg_rs2 = Reg() { Bits() };
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val ex_reg_rs1 = Reg() { Bits() };
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val ex_reg_waddr = Reg() { UFix() };
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val ex_reg_ctrl_fn_dw = Reg() { UFix() };
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val ex_reg_ctrl_fn_alu = Reg() { UFix() };
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val ex_reg_sel_alu2 = Reg() { UFix() };
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val ex_reg_ctrl_sel_wb = Reg() { UFix() };
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val ex_wdata = Bits()
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val ex_reg_kill = Reg() { Bool() }
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val ex_reg_kill = Reg{Bool()}
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val ex_reg_rs1_bypass = Reg{Bool()}
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val ex_reg_rs1_lsb = Reg{Bits()}
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val ex_reg_rs1_msb = Reg{Bits()}
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val ex_reg_rs2_bypass = Reg{Bool()}
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val ex_reg_rs2_lsb = Reg{Bits()}
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val ex_reg_rs2_msb = Reg{Bits()}
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// memory definitions
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val mem_reg_pc = Reg() { UFix() };
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val mem_reg_inst = Reg() { Bits() };
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val mem_reg_rs1 = Reg() { Bits() };
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val mem_reg_rs2 = Reg() { Bits() };
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val mem_reg_waddr = Reg() { UFix() };
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val mem_reg_wdata = Reg() { Bits() };
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val mem_reg_raddr1 = Reg() { UFix() };
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val mem_reg_raddr2 = Reg() { UFix() };
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val mem_reg_kill = Reg() { Bool() }
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// writeback definitions
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val wb_reg_pc = Reg() { UFix() };
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val wb_reg_inst = Reg() { Bits() };
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val wb_reg_rs1 = Reg() { Bits() };
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val wb_reg_rs2 = Reg() { Bits() };
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val wb_reg_waddr = Reg() { UFix() }
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val wb_reg_wdata = Reg() { Bits() }
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val wb_reg_vec_waddr = Reg() { UFix() }
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val wb_reg_vec_wdata = Reg() { Bits() }
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val wb_reg_raddr1 = Reg() { UFix() };
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val wb_reg_raddr2 = Reg() { UFix() };
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val wb_reg_ll_wb = Reg(resetVal = Bool(false));
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val wb_wdata = Bits();
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val wb_wen = io.ctrl.wb_wen && io.ctrl.wb_valid || wb_reg_ll_wb
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// instruction decode stage
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val id_inst = io.imem.resp.bits.data
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val id_pc = io.imem.resp.bits.pc
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debug(id_inst)
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debug(id_pc)
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val regfile_ = Mem(31){Bits(width = 64)}
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def readRF(a: UFix) = regfile_(~a)
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@ -74,45 +70,36 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
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val id_raddr2 = id_inst(21,17).toUFix;
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// bypass muxes
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val id_rs1_dmem_bypass = id_raddr1 != UFix(0) &&
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Mux(io.ctrl.ex_wen && id_raddr1 === ex_reg_waddr, Bool(false),
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Mux(io.ctrl.mem_wen && id_raddr1 === mem_reg_waddr, io.ctrl.mem_load,
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Bool(false)))
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val id_rs1_zero = id_raddr1 === UFix(0)
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val id_rs1_ex_bypass = io.ctrl.ex_wen && id_raddr1 === ex_reg_waddr
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val id_rs1_mem_bypass = io.ctrl.mem_wen && id_raddr1 === mem_reg_waddr
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val id_rs1_bypass = id_rs1_zero || id_rs1_ex_bypass || id_rs1_mem_bypass
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val id_rs1_bypass_src = Mux(id_rs1_zero, UFix(0), Mux(id_rs1_ex_bypass, UFix(1), UFix(2) | io.ctrl.mem_load))
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val id_rs1 =
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Mux(id_raddr1 === UFix(0), UFix(0),
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Mux(io.ctrl.ex_wen && id_raddr1 === ex_reg_waddr, ex_wdata,
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Mux(io.ctrl.mem_wen && id_raddr1 === mem_reg_waddr, mem_reg_wdata,
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Mux((io.ctrl.wb_wen || wb_reg_ll_wb) && id_raddr1 === wb_reg_waddr, wb_wdata,
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readRF(id_raddr1)))))
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Mux(wb_wen && id_raddr1 === wb_reg_waddr, wb_wdata,
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readRF(id_raddr1)))
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val id_rs2_dmem_bypass = id_raddr2 != UFix(0) &&
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Mux(io.ctrl.ex_wen && id_raddr2 === ex_reg_waddr, Bool(false),
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Mux(io.ctrl.mem_wen && id_raddr2 === mem_reg_waddr, io.ctrl.mem_load,
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Bool(false)))
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val id_rs2_zero = id_raddr2 === UFix(0)
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val id_rs2_ex_bypass = io.ctrl.ex_wen && id_raddr2 === ex_reg_waddr
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val id_rs2_mem_bypass = io.ctrl.mem_wen && id_raddr2 === mem_reg_waddr
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val id_rs2_bypass = id_rs2_zero || id_rs2_ex_bypass || id_rs2_mem_bypass
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val id_rs2_bypass_src = Mux(id_rs2_zero, UFix(0), Mux(id_rs2_ex_bypass, UFix(1), UFix(2) | io.ctrl.mem_load))
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val id_rs2 = Mux(id_raddr2 === UFix(0), UFix(0),
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Mux(io.ctrl.ex_wen && id_raddr2 === ex_reg_waddr, ex_wdata,
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Mux(io.ctrl.mem_wen && id_raddr2 === mem_reg_waddr, mem_reg_wdata,
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Mux((io.ctrl.wb_wen || wb_reg_ll_wb) && id_raddr2 === wb_reg_waddr, wb_wdata,
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readRF(id_raddr2)))))
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Mux(wb_wen && id_raddr2 === wb_reg_waddr, wb_wdata,
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readRF(id_raddr2)))
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// immediate generation
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val id_imm_bj = io.ctrl.sel_alu2 === A2_BTYPE || io.ctrl.sel_alu2 === A2_JTYPE
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val id_imm_l = io.ctrl.sel_alu2 === A2_LTYPE
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val id_imm_zero = io.ctrl.sel_alu2 === A2_ZERO || io.ctrl.sel_alu2 === A2_RTYPE
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val id_imm_ibz = io.ctrl.sel_alu2 === A2_ITYPE || io.ctrl.sel_alu2 === A2_BTYPE || id_imm_zero
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val id_imm_sign = Mux(id_imm_bj, id_inst(31),
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Mux(id_imm_l, id_inst(26),
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Mux(id_imm_zero, Bits(0,1),
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id_inst(21)))) // IMM_ITYPE
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val id_imm_small = Mux(id_imm_zero, Bits(0,12),
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Cat(Mux(id_imm_bj, id_inst(31,27), id_inst(21,17)), id_inst(16,10)))
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val id_imm = Cat(Fill(32, id_imm_sign),
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Mux(id_imm_l, Cat(id_inst(26,7), Bits(0,12)),
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Mux(id_imm_ibz, Cat(Fill(20, id_imm_sign), id_imm_small),
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Cat(Fill(7, id_imm_sign), id_inst(31,7))))) // A2_JTYPE
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val id_op2_dmem_bypass = id_rs2_dmem_bypass && io.ctrl.sel_alu2 === A2_RTYPE
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val id_op2 = Mux(io.ctrl.sel_alu2 === A2_RTYPE, id_rs2, id_imm)
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def imm(sel: Bits, inst: Bits) = {
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val lsbs = Mux(sel === A2_LTYPE || sel === A2_ZERO, Bits(0),
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Mux(sel === A2_BTYPE, Cat(inst(31,27), inst(16,10)),
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Mux(sel === A2_JTYPE, inst(18,7),
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inst(21,10))))
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val msbs = Mux(sel === A2_LTYPE, inst(26,7),
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Mux(sel === A2_JTYPE, inst(31,19).toFix,
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Mux(sel === A2_ITYPE, inst(21), inst(31)).toFix))
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Cat(msbs, lsbs).toFix
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}
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io.ctrl.inst := id_inst
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io.fpu.inst := id_inst
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@ -122,21 +109,47 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
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when (!io.ctrl.killd) {
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ex_reg_pc := id_pc
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ex_reg_inst := id_inst
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ex_reg_raddr1 := id_raddr1
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ex_reg_raddr2 := id_raddr2
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ex_reg_op2 := id_op2
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ex_reg_waddr := Mux(io.ctrl.sel_wa === WA_RD, id_inst(31,27).toUFix, RA)
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ex_reg_ctrl_fn_dw := io.ctrl.fn_dw.toUFix
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ex_reg_ctrl_fn_alu := io.ctrl.fn_alu
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ex_reg_sel_alu2 := io.ctrl.sel_alu2
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ex_reg_ctrl_sel_wb := io.ctrl.sel_wb
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when (io.ctrl.ren1) { ex_reg_rs1 := id_rs1 }
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when (io.ctrl.ren2) { ex_reg_rs2 := id_rs2 }
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when (io.ctrl.ren1) {
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ex_reg_rs1_bypass := id_rs1_bypass
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ex_reg_rs1_lsb := id_rs1_bypass_src
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when (!id_rs1_bypass) {
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ex_reg_rs1_lsb := id_rs1(id_rs1_bypass_src.getWidth-1,0)
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ex_reg_rs1_msb := id_rs1(63,id_rs1_bypass_src.getWidth)
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}
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}
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when (io.ctrl.ren2) {
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ex_reg_rs2_bypass := id_rs2_bypass
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ex_reg_rs2_lsb := id_rs2_bypass_src
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when (!id_rs2_bypass) {
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ex_reg_rs2_lsb := id_rs2(id_rs2_bypass_src.getWidth-1,0)
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ex_reg_rs2_msb := id_rs2(63,id_rs2_bypass_src.getWidth)
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}
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}
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}
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val ex_raddr1 = ex_reg_inst(26,22)
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val ex_raddr2 = ex_reg_inst(21,17)
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val dmem_resp_data = if (conf.fastLoadByte) io.dmem.resp.bits.data_subword else io.dmem.resp.bits.data
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val ex_rs1 = Mux(Reg(id_rs1_dmem_bypass), dmem_resp_data, ex_reg_rs1)
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val ex_rs2 = Mux(Reg(id_rs2_dmem_bypass), dmem_resp_data, ex_reg_rs2)
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val ex_op2 = Mux(Reg(id_op2_dmem_bypass), dmem_resp_data, ex_reg_op2)
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val ex_rs1 =
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Mux(ex_reg_rs1_bypass && ex_reg_rs1_lsb === UFix(3), dmem_resp_data,
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Mux(ex_reg_rs1_bypass && ex_reg_rs1_lsb === UFix(2), wb_reg_wdata,
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Mux(ex_reg_rs1_bypass && ex_reg_rs1_lsb === UFix(1), mem_reg_wdata,
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Mux(ex_reg_rs1_bypass && ex_reg_rs1_lsb === UFix(0), Bits(0),
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Cat(ex_reg_rs1_msb, ex_reg_rs1_lsb)))))
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val ex_rs2 =
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Mux(ex_reg_rs2_bypass && ex_reg_rs2_lsb === UFix(3), dmem_resp_data,
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Mux(ex_reg_rs2_bypass && ex_reg_rs2_lsb === UFix(2), wb_reg_wdata,
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Mux(ex_reg_rs2_bypass && ex_reg_rs2_lsb === UFix(1), mem_reg_wdata,
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Mux(ex_reg_rs2_bypass && ex_reg_rs2_lsb === UFix(0), Bits(0),
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Cat(ex_reg_rs2_msb, ex_reg_rs2_lsb)))))
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val ex_imm = imm(ex_reg_sel_alu2, ex_reg_inst)
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val ex_op2 = Mux(ex_reg_sel_alu2 != A2_RTYPE, ex_imm, ex_rs2)
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val alu = new ALU
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alu.io.dw := ex_reg_ctrl_fn_dw;
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@ -149,7 +162,7 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
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div.io.req.valid := io.ctrl.div_val
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div.io.req.bits.fn := Cat(ex_reg_ctrl_fn_dw, io.ctrl.div_fn)
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div.io.req.bits.in0 := ex_rs1
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div.io.req.bits.in1 := ex_op2
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div.io.req.bits.in1 := ex_rs2
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div.io.req_tag := ex_reg_waddr
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div.io.req_kill := io.ctrl.div_kill
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div.io.resp_rdy := Bool(true)
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@ -168,7 +181,7 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
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mul_io.req.valid := io.ctrl.mul_val
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mul_io.req.bits.fn := Cat(ex_reg_ctrl_fn_dw, io.ctrl.mul_fn)
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mul_io.req.bits.in0 := ex_rs1
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mul_io.req.bits.in1 := ex_op2
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mul_io.req.bits.in1 := ex_rs2
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mul_io.req_tag := ex_reg_waddr
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mul_io.req_kill := io.ctrl.mul_kill
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mul_io.resp_rdy := Bool(true)
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@ -199,11 +212,10 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
// processor control regfile read
|
||||
val pcr = new rocketDpathPCR()
|
||||
pcr.io.r.en := io.ctrl.pcr != PCR_N
|
||||
pcr.io.r.addr := wb_reg_raddr1
|
||||
pcr.io.r.addr := wb_reg_inst(26,22).toUFix
|
||||
|
||||
pcr.io.host <> io.host
|
||||
pcr.io <> io.ctrl
|
||||
pcr.io.pc := wb_reg_pc
|
||||
io.ctrl.pcr_replay := pcr.io.replay
|
||||
|
||||
io.ptw.ptbr := pcr.io.ptbr
|
||||
@ -211,7 +223,7 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
io.ptw.status := pcr.io.status
|
||||
|
||||
// branch resolution logic
|
||||
io.ctrl.jalr_eq := ex_reg_rs1 === id_pc.toFix && ex_reg_op2(id_imm_small.getWidth-1,0) === UFix(0)
|
||||
io.ctrl.jalr_eq := ex_rs1 === id_pc.toFix && ex_reg_inst(11,0) === UFix(0)
|
||||
io.ctrl.ex_br_taken :=
|
||||
Mux(io.ctrl.ex_br_type === BR_EQ, ex_rs1 === ex_rs2,
|
||||
Mux(io.ctrl.ex_br_type === BR_NE, ex_rs1 != ex_rs2,
|
||||
@ -221,21 +233,17 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
Mux(io.ctrl.ex_br_type === BR_GEU, ex_rs1 >= ex_rs2,
|
||||
io.ctrl.ex_br_type === BR_J))))))
|
||||
|
||||
val ex_pc_plus4 = ex_reg_pc + UFix(4)
|
||||
val ex_branch_target = ex_reg_pc + Cat(ex_reg_op2(VADDR_BITS-1,0), Bits(0,1)).toUFix
|
||||
val ex_pc_plus4 = ex_reg_pc + 4
|
||||
val ex_branch_target = (ex_reg_pc.toFix + (ex_imm << 1)).toUFix
|
||||
|
||||
// time stamp counter
|
||||
val tsc_reg = Reg(resetVal = UFix(0,64));
|
||||
tsc_reg := tsc_reg + UFix(1);
|
||||
// instructions retired counter
|
||||
val irt_reg = Reg(resetVal = UFix(0,64));
|
||||
when (io.ctrl.wb_valid) { irt_reg := irt_reg + UFix(1); }
|
||||
val tsc_reg = WideCounter(64)
|
||||
val irt_reg = WideCounter(64, io.ctrl.wb_valid)
|
||||
|
||||
// writeback select mux
|
||||
ex_wdata :=
|
||||
val ex_wdata =
|
||||
Mux(ex_reg_ctrl_sel_wb === WB_PC, ex_pc_plus4.toFix,
|
||||
Mux(ex_reg_ctrl_sel_wb === WB_TSC, tsc_reg,
|
||||
Mux(ex_reg_ctrl_sel_wb === WB_IRT, irt_reg,
|
||||
Mux(ex_reg_ctrl_sel_wb === WB_TSC, tsc_reg.value,
|
||||
Mux(ex_reg_ctrl_sel_wb === WB_IRT, irt_reg.value,
|
||||
alu.io.out))).toBits // WB_ALU
|
||||
|
||||
// memory stage
|
||||
@ -243,11 +251,10 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
when (!ex_reg_kill) {
|
||||
mem_reg_pc := ex_reg_pc
|
||||
mem_reg_inst := ex_reg_inst
|
||||
mem_reg_rs1 := ex_rs1
|
||||
mem_reg_rs2 := StoreGen(io.ctrl.ex_mem_type, Bits(0), ex_rs2).data
|
||||
mem_reg_waddr := ex_reg_waddr
|
||||
mem_reg_wdata := ex_wdata
|
||||
mem_reg_raddr1 := ex_reg_raddr1
|
||||
mem_reg_raddr2 := ex_reg_raddr2
|
||||
}
|
||||
|
||||
// for load/use hazard detection (load byte/halfword)
|
||||
@ -276,6 +283,7 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
io.ctrl.mem_ll_waddr := dmem_resp_waddr
|
||||
io.ctrl.mem_ll_wb := Bool(true)
|
||||
}
|
||||
when (io.ctrl.mem_ll_waddr === UFix(0)) { io.ctrl.mem_ll_wb := Bool(false) }
|
||||
|
||||
io.fpu.dmem_resp_val := io.dmem.resp.valid && dmem_resp_fpu
|
||||
io.fpu.dmem_resp_data := io.dmem.resp.bits.data
|
||||
@ -286,11 +294,8 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
when (!mem_reg_kill) {
|
||||
wb_reg_pc := mem_reg_pc
|
||||
wb_reg_inst := mem_reg_inst
|
||||
wb_reg_rs1 := mem_reg_rs1
|
||||
wb_reg_rs2 := mem_reg_rs2
|
||||
wb_reg_vec_waddr := mem_reg_waddr
|
||||
wb_reg_vec_wdata := mem_reg_wdata
|
||||
wb_reg_raddr1 := mem_reg_raddr1
|
||||
wb_reg_raddr2 := mem_reg_raddr2
|
||||
wb_reg_waddr := mem_reg_waddr
|
||||
wb_reg_wdata := Mux(io.ctrl.mem_fp_val && io.ctrl.mem_wen, io.fpu.toint_data, mem_reg_wdata)
|
||||
}
|
||||
@ -299,6 +304,9 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
wb_reg_waddr := io.ctrl.mem_ll_waddr
|
||||
wb_reg_wdata := mem_ll_wdata
|
||||
}
|
||||
wb_wdata := Mux(io.ctrl.wb_load, io.dmem.resp.bits.data_subword,
|
||||
Mux(io.ctrl.pcr != PCR_N, pcr.io.r.data,
|
||||
wb_reg_wdata))
|
||||
|
||||
if (HAVE_VEC)
|
||||
{
|
||||
@ -310,11 +318,9 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
|
||||
vec.io.valid := io.ctrl.wb_valid && pcr.io.status(SR_EV)
|
||||
vec.io.inst := wb_reg_inst
|
||||
vec.io.waddr := wb_reg_vec_waddr
|
||||
vec.io.raddr1 := wb_reg_raddr1
|
||||
vec.io.vecbank := pcr.io.vecbank
|
||||
vec.io.vecbankcnt := pcr.io.vecbankcnt
|
||||
vec.io.wdata := wb_reg_vec_wdata
|
||||
vec.io.wdata := wb_reg_wdata
|
||||
vec.io.rs2 := wb_reg_rs2
|
||||
|
||||
pcr.io.vec_irq_aux := vec.io.irq_aux
|
||||
@ -322,29 +328,10 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
pcr.io.vec_nxregs := vec.io.nxregs
|
||||
pcr.io.vec_nfregs := vec.io.nfregs
|
||||
|
||||
wb_wdata :=
|
||||
Mux(vec.io.wen, Cat(Bits(0,52), vec.io.appvl),
|
||||
Mux(io.ctrl.wb_load, io.dmem.resp.bits.data_subword,
|
||||
wb_reg_wdata))
|
||||
}
|
||||
else
|
||||
{
|
||||
pcr.io.vec_irq_aux := UFix(0)
|
||||
pcr.io.vec_appvl := UFix(0)
|
||||
pcr.io.vec_nxregs := UFix(0)
|
||||
pcr.io.vec_nfregs := UFix(0)
|
||||
|
||||
wb_wdata :=
|
||||
Mux(io.ctrl.wb_load, io.dmem.resp.bits.data_subword,
|
||||
wb_reg_wdata)
|
||||
when (vec.io.wen) { wb_wdata := vec.io.appvl }
|
||||
}
|
||||
|
||||
val rf_wen = io.ctrl.wb_wen || wb_reg_ll_wb
|
||||
val rf_waddr = wb_reg_waddr
|
||||
val rf_wdata = Mux(io.ctrl.wb_wen && io.ctrl.pcr != PCR_N, pcr.io.r.data, wb_wdata)
|
||||
List(rf_wen, rf_waddr, rf_wdata).map(debug _)
|
||||
when (rf_wen) { writeRF(rf_waddr, rf_wdata) }
|
||||
|
||||
when (wb_wen) { writeRF(wb_reg_waddr, wb_wdata) }
|
||||
io.ctrl.wb_waddr := wb_reg_waddr
|
||||
|
||||
// scoreboard clear (for div/mul and D$ load miss writebacks)
|
||||
@ -352,7 +339,7 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
io.ctrl.fp_sboard_clra := dmem_resp_waddr
|
||||
|
||||
// processor control regfile write
|
||||
pcr.io.w.addr := wb_reg_raddr1
|
||||
pcr.io.w.addr := wb_reg_inst(26,22).toUFix
|
||||
pcr.io.w.en := io.ctrl.pcr === PCR_T || io.ctrl.pcr === PCR_S || io.ctrl.pcr === PCR_C
|
||||
pcr.io.w.data := Mux(io.ctrl.pcr === PCR_S, pcr.io.r.data | wb_reg_wdata,
|
||||
Mux(io.ctrl.pcr === PCR_C, pcr.io.r.data & ~wb_reg_wdata,
|
||||
@ -365,4 +352,10 @@ class Datapath(implicit conf: RocketConfiguration) extends Component
|
||||
Mux(io.ctrl.sel_pc === PC_EX, Mux(io.ctrl.ex_jalr, ex_effective_address, ex_branch_target),
|
||||
Mux(io.ctrl.sel_pc === PC_PCR, Cat(pcr.io.evec(VADDR_BITS-1), pcr.io.evec).toUFix,
|
||||
wb_reg_pc))) // PC_WB
|
||||
|
||||
// expose debug signals to testbench
|
||||
// XXX debug() doesn't right, so create a false dependence
|
||||
val debugList = List(wb_reg_pc, wb_reg_inst, wb_wen, wb_reg_waddr, wb_wdata, wb_reg_rs1, wb_reg_rs2)
|
||||
pcr.io.pc := wb_reg_pc | (debugList.map(d => d^d).reduce(_|_)).toUFix
|
||||
debugList.foreach(debug _)
|
||||
}
|
||||
|
||||
@ -4,6 +4,7 @@ import Chisel._
|
||||
import Node._
|
||||
import Constants._
|
||||
import scala.math._
|
||||
import Util._
|
||||
|
||||
class ioDpathBTB extends Bundle()
|
||||
{
|
||||
@ -86,10 +87,10 @@ class rocketDpathPCR(implicit conf: RocketConfiguration) extends Component
|
||||
{
|
||||
val io = new ioDpathPCR
|
||||
|
||||
val reg_epc = Reg() { UFix() };
|
||||
val reg_badvaddr = Reg() { UFix() };
|
||||
val reg_ebase = Reg() { UFix() };
|
||||
val reg_count = Reg() { UFix() };
|
||||
val reg_epc = Reg{Fix()}
|
||||
val reg_badvaddr = Reg{Fix()}
|
||||
val reg_ebase = Reg{Fix()}
|
||||
val reg_count = WideCounter(32)
|
||||
val reg_compare = Reg() { UFix() };
|
||||
val reg_cause = Reg() { Bits() };
|
||||
val reg_tohost = Reg(resetVal = Bits(0, 64));
|
||||
@ -128,7 +129,7 @@ class rocketDpathPCR(implicit conf: RocketConfiguration) extends Component
|
||||
|
||||
io.ptbr_wen := reg_status_vm.toBool && wen && (waddr === PCR_PTBR);
|
||||
io.status := Cat(reg_status_im, Bits(0,7), reg_status_vm, reg_status_sx, reg_status_ux, reg_status_s, reg_status_ps, reg_status_ec, reg_status_ev, reg_status_ef, reg_status_et);
|
||||
io.evec := Mux(io.exception, reg_ebase, reg_epc)
|
||||
io.evec := Mux(io.exception, reg_ebase, reg_epc).toUFix
|
||||
io.ptbr := reg_ptbr;
|
||||
io.host.debug.error_mode := reg_error_mode;
|
||||
io.r.data := rdata;
|
||||
@ -168,7 +169,6 @@ class rocketDpathPCR(implicit conf: RocketConfiguration) extends Component
|
||||
when (reg_count === reg_compare) {
|
||||
r_irq_timer := Bool(true);
|
||||
}
|
||||
reg_count := reg_count + UFix(1);
|
||||
|
||||
io.irq_timer := r_irq_timer;
|
||||
io.irq_ipi := r_irq_ipi;
|
||||
@ -191,9 +191,9 @@ class rocketDpathPCR(implicit conf: RocketConfiguration) extends Component
|
||||
reg_status_ec := Bool(HAVE_RVC) && wdata(SR_EC).toBool;
|
||||
reg_status_et := wdata(SR_ET).toBool;
|
||||
}
|
||||
when (waddr === PCR_EPC) { reg_epc := wdata(VADDR_BITS,0).toUFix; }
|
||||
when (waddr === PCR_EPC) { reg_epc := wdata(VADDR_BITS,0).toFix }
|
||||
when (waddr === PCR_EVEC) { reg_ebase := wdata(VADDR_BITS-1,0).toUFix; }
|
||||
when (waddr === PCR_COUNT) { reg_count := wdata(31,0).toUFix; }
|
||||
when (waddr === PCR_COUNT) { reg_count := wdata.toUFix }
|
||||
when (waddr === PCR_COMPARE) { reg_compare := wdata(31,0).toUFix; r_irq_timer := Bool(false); }
|
||||
when (waddr === PCR_COREID) { reg_coreid := wdata(15,0) }
|
||||
when (waddr === PCR_FROMHOST) { when (reg_fromhost === UFix(0) || io.w.en) { reg_fromhost := wdata } }
|
||||
@ -210,19 +210,19 @@ class rocketDpathPCR(implicit conf: RocketConfiguration) extends Component
|
||||
|
||||
rdata := io.status // raddr === PCR_STATUS
|
||||
switch (raddr) {
|
||||
is (PCR_EPC) { rdata := Cat(Fill(64-VADDR_BITS-1, reg_epc(VADDR_BITS)), reg_epc); }
|
||||
is (PCR_BADVADDR) { rdata := Cat(Fill(64-VADDR_BITS-1, reg_badvaddr(VADDR_BITS)), reg_badvaddr); }
|
||||
is (PCR_EVEC) { rdata := Cat(Fill(64-VADDR_BITS, reg_ebase(VADDR_BITS-1)), reg_ebase); }
|
||||
is (PCR_COUNT) { rdata := Cat(Fill(32, reg_count(31)), reg_count); }
|
||||
is (PCR_COMPARE) { rdata := Cat(Fill(32, reg_compare(31)), reg_compare); }
|
||||
is (PCR_CAUSE) { rdata := Cat(reg_cause(5), Bits(0,58), reg_cause(4,0)); }
|
||||
is (PCR_EPC) { rdata := reg_epc }
|
||||
is (PCR_BADVADDR) { rdata := reg_badvaddr }
|
||||
is (PCR_EVEC) { rdata := reg_ebase }
|
||||
is (PCR_COUNT) { rdata := reg_count }
|
||||
is (PCR_COMPARE) { rdata := reg_compare }
|
||||
is (PCR_CAUSE) { rdata := reg_cause(5) << 63 | reg_cause(4,0) }
|
||||
is (PCR_COREID) { rdata := reg_coreid }
|
||||
is (PCR_IMPL) { rdata := Bits(2) }
|
||||
is (PCR_FROMHOST) { rdata := reg_fromhost; }
|
||||
is (PCR_TOHOST) { rdata := reg_tohost; }
|
||||
is (PCR_K0) { rdata := reg_k0; }
|
||||
is (PCR_K1) { rdata := reg_k1; }
|
||||
is (PCR_PTBR) { rdata := Cat(Bits(0,64-PADDR_BITS), reg_ptbr); }
|
||||
is (PCR_PTBR) { rdata := reg_ptbr }
|
||||
is (PCR_VECBANK) { rdata := Cat(Bits(0, 56), reg_vecbank) }
|
||||
is (PCR_VECCFG) { rdata := Cat(Bits(0, 40), io.vec_nfregs, io.vec_nxregs, io.vec_appvl) }
|
||||
}
|
||||
|
||||
@ -28,8 +28,6 @@ class ioDpathVec extends Bundle
|
||||
val iface = new ioDpathVecInterface()
|
||||
val valid = Bool(INPUT)
|
||||
val inst = Bits(INPUT, 32)
|
||||
val waddr = UFix(INPUT, 5)
|
||||
val raddr1 = UFix(INPUT, 5)
|
||||
val vecbank = Bits(INPUT, 8)
|
||||
val vecbankcnt = UFix(INPUT, 4)
|
||||
val wdata = Bits(INPUT, 64)
|
||||
@ -151,14 +149,16 @@ class rocketDpathVec extends Component
|
||||
io.nfregs := reg_nfregs
|
||||
|
||||
val appvlm1 = appvl - UFix(1)
|
||||
val waddr = io.inst(31,27)
|
||||
val raddr1 = io.inst(26,22)
|
||||
|
||||
io.iface.vcmdq.bits :=
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_I, Cat(Bits(0,2), Bits(0,4), io.inst(9,8), Bits(0,6), Bits(0,6)),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_F, Cat(Bits(0,2), Bits(1,3), io.inst(9,7), Bits(0,6), Bits(0,6)),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_TX, Cat(Bits(1,2), io.inst(13,8), Bits(0,1), io.waddr, Bits(0,1), io.raddr1),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_TF, Cat(Bits(1,2), io.inst(13,8), Bits(1,1), io.waddr, Bits(1,1), io.raddr1),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_MX, Cat(Bits(1,1), io.inst(13,12), io.inst(2), io.inst(10,7), Bits(0,1), io.waddr, Bits(0,1), io.waddr),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_MF, Cat(Bits(1,1), io.inst(13,12), io.inst(2), io.inst(10,7), Bits(1,1), io.waddr, Bits(1,1), io.waddr),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_TX, Cat(Bits(1,2), io.inst(13,8), Bits(0,1), waddr, Bits(0,1), raddr1),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_TF, Cat(Bits(1,2), io.inst(13,8), Bits(1,1), waddr, Bits(1,1), raddr1),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_MX, Cat(Bits(1,1), io.inst(13,12), io.inst(2), io.inst(10,7), Bits(0,1), waddr, Bits(0,1), waddr),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_MF, Cat(Bits(1,1), io.inst(13,12), io.inst(2), io.inst(10,7), Bits(1,1), waddr, Bits(1,1), waddr),
|
||||
Mux(io.ctrl.sel_vcmd === VCMD_A, io.wdata(SZ_VCMD-1, 0),
|
||||
Bits(0,20))))))))
|
||||
|
||||
|
||||
@ -7,4 +7,30 @@ object Util
|
||||
implicit def intToUFix(x: Int): UFix = UFix(x)
|
||||
implicit def intToBoolean(x: Int): Boolean = if (x != 0) true else false
|
||||
implicit def booleanToInt(x: Boolean): Int = if (x) 1 else 0
|
||||
|
||||
implicit def wcToUFix(c: WideCounter): UFix = c.value
|
||||
}
|
||||
|
||||
// a counter that clock gates most of its MSBs using the LSB carry-out
|
||||
case class WideCounter(width: Int, inc: Bool = Bool(true))
|
||||
{
|
||||
private val isWide = width >= 4
|
||||
private val smallWidth = if (isWide) log2Up(width) else width
|
||||
private val small = Reg(resetVal = UFix(0, smallWidth))
|
||||
private val nextSmall = small + UFix(1, smallWidth+1)
|
||||
when (inc) { small := nextSmall(smallWidth-1,0) }
|
||||
|
||||
private val large = if (isWide) {
|
||||
val r = Reg(resetVal = UFix(0, width - smallWidth))
|
||||
when (inc && nextSmall(smallWidth)) { r := r + UFix(1) }
|
||||
r
|
||||
} else null
|
||||
|
||||
val value = Cat(large, small)
|
||||
|
||||
def := (x: UFix) = {
|
||||
val w = x.getWidth
|
||||
small := x(w.min(smallWidth)-1,0)
|
||||
if (isWide) large := (if (w < smallWidth) UFix(0) else x(w.min(width)-1,smallWidth))
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user