riscv/rocket-chip
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Merge branch 'master' into hwacha-port

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This commit is contained in:
Stephen Twigg
2014-02-04 17:05:03 -08:00
parent 3c3c469725 2c2b3a7678
commit 6a02d15c21
11 changed files with 122 additions and 89 deletions
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4
rocket/src/main/scala/consts.scala
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@@ -59,10 +59,6 @@ trait ScalarOpConstants {
val RA = UInt(1, 5) val RA = UInt(1, 5)
} }
trait InterruptConstants {
val CAUSE_INTERRUPT = 32
}
trait VectorOpConstants { trait VectorOpConstants {
val VEC_X = Bits("b??", 2).toUInt val VEC_X = Bits("b??", 2).toUInt

76
rocket/src/main/scala/ctrl.scala
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@@ -6,7 +6,7 @@ import uncore.constants.MemoryOpConstants._
import ALU._ import ALU._
import Util._ import Util._
class CtrlDpathIO extends Bundle() class CtrlDpathIO(implicit conf: RocketConfiguration) extends Bundle
{ {
// outputs to datapath // outputs to datapath
val sel_pc = UInt(OUTPUT, 3) val sel_pc = UInt(OUTPUT, 3)
@@ -42,7 +42,7 @@ class CtrlDpathIO extends Bundle()
// exception handling // exception handling
val retire = Bool(OUTPUT) val retire = Bool(OUTPUT)
val exception = Bool(OUTPUT) val exception = Bool(OUTPUT)
val cause = UInt(OUTPUT, 6) val cause = UInt(OUTPUT, conf.xprlen)
val badvaddr_wen = Bool(OUTPUT) // high for a load/store access fault val badvaddr_wen = Bool(OUTPUT) // high for a load/store access fault
// inputs from datapath // inputs from datapath
val inst = Bits(INPUT, 32) val inst = Bits(INPUT, 32)
@@ -90,12 +90,12 @@ object XDecode extends DecodeConstants
// | | | | | | | | | | | | | | | | | | | | | | | fence // | | | | | | | | | | | | | | | | | | | | | | | fence
// | | | | | | | | | | | | | | | | | | | | | | | | amo // | | | | | | | | | | | | | | | | | | | | | | | | amo
// | | | | | | | | | | | | | | | | | | | | | | | | | // | | | | | | | | | | | | | | | | | | | | | | | | |
BNE-> List(Y, N,N,BR_NE, N,Y,Y,A2_RS2, A1_RS1, IMM_SB,DW_X, FN_ADD, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N), BNE-> List(Y, N,N,BR_NE, N,Y,Y,A2_X, A1_X, IMM_SB,DW_X, FN_X, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N),
BEQ-> List(Y, N,N,BR_EQ, N,Y,Y,A2_RS2, A1_RS1, IMM_SB,DW_X, FN_ADD, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N), BEQ-> List(Y, N,N,BR_EQ, N,Y,Y,A2_X, A1_X, IMM_SB,DW_X, FN_X, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N),
BLT-> List(Y, N,N,BR_LT, N,Y,Y,A2_RS2, A1_RS1, IMM_SB,DW_X, FN_ADD, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N), BLT-> List(Y, N,N,BR_LT, N,Y,Y,A2_X, A1_X, IMM_SB,DW_X, FN_X, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N),
BLTU-> List(Y, N,N,BR_LTU,N,Y,Y,A2_RS2, A1_RS1, IMM_SB,DW_X, FN_ADD, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N), BLTU-> List(Y, N,N,BR_LTU,N,Y,Y,A2_X, A1_X, IMM_SB,DW_X, FN_X, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N),
BGE-> List(Y, N,N,BR_GE, N,Y,Y,A2_RS2, A1_RS1, IMM_SB,DW_X, FN_ADD, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N), BGE-> List(Y, N,N,BR_GE, N,Y,Y,A2_X, A1_X, IMM_SB,DW_X, FN_X, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N),
BGEU-> List(Y, N,N,BR_GEU,N,Y,Y,A2_RS2, A1_RS1, IMM_SB,DW_X, FN_ADD, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N), BGEU-> List(Y, N,N,BR_GEU,N,Y,Y,A2_X, A1_X, IMM_SB,DW_X, FN_X, N,M_X, MT_X, N,N,N,CSR.N,N,N,N,N,N,N),
JAL-> List(Y, N,N,BR_J, N,N,N,A2_FOUR,A1_PC, IMM_UJ,DW_X, FN_ADD, N,M_X, MT_X, N,N,Y,CSR.N,N,N,N,N,N,N), JAL-> List(Y, N,N,BR_J, N,N,N,A2_FOUR,A1_PC, IMM_UJ,DW_X, FN_ADD, N,M_X, MT_X, N,N,Y,CSR.N,N,N,N,N,N,N),
JALR-> List(Y, N,N,BR_N, Y,N,Y,A2_FOUR,A1_PC, IMM_I, DW_XPR,FN_ADD, N,M_X, MT_X, N,N,Y,CSR.N,N,N,N,N,N,N), JALR-> List(Y, N,N,BR_N, Y,N,Y,A2_FOUR,A1_PC, IMM_I, DW_XPR,FN_ADD, N,M_X, MT_X, N,N,Y,CSR.N,N,N,N,N,N,N),
@@ -395,7 +395,7 @@ class Control(implicit conf: RocketConfiguration) extends Module
val id_reg_fence = Reg(init=Bool(false)) val id_reg_fence = Reg(init=Bool(false))
val sr = io.dpath.status val sr = io.dpath.status
var id_interrupts = (0 until sr.ip.getWidth).map(i => (sr.im(i) && sr.ip(i), UInt(CAUSE_INTERRUPT+i))) var id_interrupts = (0 until sr.ip.getWidth).map(i => (sr.im(i) && sr.ip(i), UInt(BigInt(1) << (conf.xprlen-1) | i)))
val (id_interrupt_unmasked, id_interrupt_cause) = checkExceptions(id_interrupts) val (id_interrupt_unmasked, id_interrupt_cause) = checkExceptions(id_interrupts)
val id_interrupt = io.dpath.status.ei && id_interrupt_unmasked val id_interrupt = io.dpath.status.ei && id_interrupt_unmasked
@@ -410,16 +410,18 @@ class Control(implicit conf: RocketConfiguration) extends Module
val id_csr_en = id_csr != CSR.N val id_csr_en = id_csr != CSR.N
val id_csr_fp = Bool(conf.fpu) && id_csr_en && DecodeLogic(id_csr_addr, fp_csrs, CSRs.all.toSet -- fp_csrs) val id_csr_fp = Bool(conf.fpu) && id_csr_en && DecodeLogic(id_csr_addr, fp_csrs, CSRs.all.toSet -- fp_csrs)
val id_csr_wen = id_raddr1 != UInt(0) || !Vec(CSR.S, CSR.C).contains(id_csr) val id_csr_wen = id_raddr1 != UInt(0) || !Vec(CSR.S, CSR.C).contains(id_csr)
val id_csr_privileged = id_csr_en &&
(id_csr_addr(9,8) != UInt(0) ||
id_csr_addr(11,10) != UInt(0) && id_csr_wen)
val id_csr_invalid = id_csr_en && !Vec(legal_csrs.map(UInt(_))).contains(id_csr_addr) val id_csr_invalid = id_csr_en && !Vec(legal_csrs.map(UInt(_))).contains(id_csr_addr)
val id_csr_privileged = id_csr_en &&
(id_csr_addr(11,10) === UInt(3) && id_csr_wen ||
id_csr_addr(11,10) === UInt(2) ||
id_csr_addr(11,10) === UInt(1) && !io.dpath.status.s ||
id_csr_addr(9,8) >= UInt(2) ||
id_csr_addr(9,8) === UInt(1) && !io.dpath.status.s && id_csr_wen)
// flush pipeline on CSR writes that may have side effects // flush pipeline on CSR writes that may have side effects
val id_csr_flush = { val id_csr_flush = {
val safe_csrs = CSRs.sup0 :: CSRs.sup1 :: CSRs.epc :: Nil val safe_csrs = CSRs.sup0 :: CSRs.sup1 :: CSRs.epc :: Nil
id_csr_en && id_csr_wen && DecodeLogic(id_csr_addr, legal_csrs -- safe_csrs, safe_csrs) id_csr_en && id_csr_wen && !DecodeLogic(id_csr_addr, safe_csrs, legal_csrs -- safe_csrs)
} }
val id_privileged = id_sret || id_csr_privileged
// stall decode for fences (now, for AMO.aq; later, for AMO.rl and FENCE) // stall decode for fences (now, for AMO.aq; later, for AMO.rl and FENCE)
val id_amo_aq = io.dpath.inst(26) val id_amo_aq = io.dpath.inst(26)
@@ -433,13 +435,14 @@ class Control(implicit conf: RocketConfiguration) extends Module
val (id_xcpt, id_cause) = checkExceptions(List( val (id_xcpt, id_cause) = checkExceptions(List(
(id_interrupt, id_interrupt_cause), (id_interrupt, id_interrupt_cause),
(io.imem.resp.bits.xcpt_ma, UInt(0)), (io.imem.resp.bits.xcpt_ma, UInt(Causes.misaligned_fetch)),
(io.imem.resp.bits.xcpt_if, UInt(1)), (io.imem.resp.bits.xcpt_if, UInt(Causes.fault_fetch)),
(!id_int_val || id_csr_invalid, UInt(2)), (!id_int_val || id_csr_invalid, UInt(Causes.illegal_instruction)),
(id_privileged && !io.dpath.status.s, UInt(3)), (id_csr_privileged, UInt(Causes.privileged_instruction)),
((id_fp_val || id_csr_fp) && !io.dpath.status.ef, UInt(4)), (id_sret && !io.dpath.status.s, UInt(Causes.privileged_instruction)),
(id_syscall, UInt(6)), ((id_fp_val || id_csr_fp) && !io.dpath.status.ef, UInt(Causes.fp_disabled)),
(id_rocc_val && !io.dpath.status.er, UInt(12)))) (id_syscall, UInt(Causes.syscall)),
(id_rocc_val && !io.dpath.status.er, UInt(Causes.accelerator_disabled))))
ex_reg_xcpt_interrupt := id_interrupt && !take_pc && io.imem.resp.valid ex_reg_xcpt_interrupt := id_interrupt && !take_pc && io.imem.resp.valid
when (id_xcpt) { ex_reg_cause := id_cause } when (id_xcpt) { ex_reg_cause := id_cause }
@@ -496,7 +499,7 @@ class Control(implicit conf: RocketConfiguration) extends Module
val (ex_xcpt, ex_cause) = checkExceptions(List( val (ex_xcpt, ex_cause) = checkExceptions(List(
(ex_reg_xcpt_interrupt || ex_reg_xcpt, ex_reg_cause), (ex_reg_xcpt_interrupt || ex_reg_xcpt, ex_reg_cause),
(ex_reg_fp_val && io.fpu.illegal_rm, UInt(2)))) (ex_reg_fp_val && io.fpu.illegal_rm, UInt(Causes.illegal_instruction))))
mem_reg_replay := replay_ex && !take_pc_wb mem_reg_replay := replay_ex && !take_pc_wb
mem_reg_xcpt_interrupt := ex_reg_xcpt_interrupt && !take_pc_wb && !mem_reg_replay_next mem_reg_xcpt_interrupt := ex_reg_xcpt_interrupt && !take_pc_wb && !mem_reg_replay_next
@@ -533,10 +536,10 @@ class Control(implicit conf: RocketConfiguration) extends Module
val (mem_xcpt, mem_cause) = checkExceptions(List( val (mem_xcpt, mem_cause) = checkExceptions(List(
(mem_reg_xcpt_interrupt || mem_reg_xcpt, mem_reg_cause), (mem_reg_xcpt_interrupt || mem_reg_xcpt, mem_reg_cause),
(mem_reg_mem_val && io.dmem.xcpt.ma.ld, UInt( 8)), (mem_reg_mem_val && io.dmem.xcpt.ma.ld, UInt(Causes.misaligned_load)),
(mem_reg_mem_val && io.dmem.xcpt.ma.st, UInt( 9)), (mem_reg_mem_val && io.dmem.xcpt.ma.st, UInt(Causes.misaligned_store)),
(mem_reg_mem_val && io.dmem.xcpt.pf.ld, UInt(10)), (mem_reg_mem_val && io.dmem.xcpt.pf.ld, UInt(Causes.fault_load)),
(mem_reg_mem_val && io.dmem.xcpt.pf.st, UInt(11)))) (mem_reg_mem_val && io.dmem.xcpt.pf.st, UInt(Causes.fault_store))))
val dcache_kill_mem = mem_reg_wen && io.dmem.replay_next.valid // structural hazard on writeback port val dcache_kill_mem = mem_reg_wen && io.dmem.replay_next.valid // structural hazard on writeback port
val fpu_kill_mem = mem_reg_fp_val && io.fpu.nack_mem val fpu_kill_mem = mem_reg_fp_val && io.fpu.nack_mem
@@ -645,10 +648,13 @@ class Control(implicit conf: RocketConfiguration) extends Module
} }
// stall for RAW/WAW hazards on PCRs, loads, AMOs, and mul/div in execute stage. // stall for RAW/WAW hazards on PCRs, loads, AMOs, and mul/div in execute stage.
val id_renx1_not0 = id_renx1 && id_raddr1 != UInt(0)
val id_renx2_not0 = id_renx2 && id_raddr2 != UInt(0)
val id_wen_not0 = id_wen && id_waddr != UInt(0)
val data_hazard_ex = ex_reg_wen && val data_hazard_ex = ex_reg_wen &&
(id_renx1.toBool && id_raddr1 === io.dpath.ex_waddr || (id_renx1_not0 && id_raddr1 === io.dpath.ex_waddr ||
id_renx2.toBool && id_raddr2 === io.dpath.ex_waddr || id_renx2_not0 && id_raddr2 === io.dpath.ex_waddr ||
id_wen.toBool && id_waddr === io.dpath.ex_waddr) id_wen_not0 && id_waddr === io.dpath.ex_waddr)
val fp_data_hazard_ex = ex_reg_fp_wen && val fp_data_hazard_ex = ex_reg_fp_wen &&
(io.fpu.dec.ren1 && id_raddr1 === io.dpath.ex_waddr || (io.fpu.dec.ren1 && id_raddr1 === io.dpath.ex_waddr ||
io.fpu.dec.ren2 && id_raddr2 === io.dpath.ex_waddr || io.fpu.dec.ren2 && id_raddr2 === io.dpath.ex_waddr ||
@@ -662,9 +668,9 @@ class Control(implicit conf: RocketConfiguration) extends Module
if (conf.fastLoadWord) Bool(!conf.fastLoadByte) && mem_reg_slow_bypass if (conf.fastLoadWord) Bool(!conf.fastLoadByte) && mem_reg_slow_bypass
else Bool(true) else Bool(true)
val data_hazard_mem = mem_reg_wen && val data_hazard_mem = mem_reg_wen &&
(id_raddr1 != UInt(0) && id_renx1 && id_raddr1 === io.dpath.mem_waddr || (id_renx1_not0 && id_raddr1 === io.dpath.mem_waddr ||
id_raddr2 != UInt(0) && id_renx2 && id_raddr2 === io.dpath.mem_waddr || id_renx2_not0 && id_raddr2 === io.dpath.mem_waddr ||
id_waddr != UInt(0) && id_wen && id_waddr === io.dpath.mem_waddr) id_wen_not0 && id_waddr === io.dpath.mem_waddr)
val fp_data_hazard_mem = mem_reg_fp_wen && val fp_data_hazard_mem = mem_reg_fp_wen &&
(io.fpu.dec.ren1 && id_raddr1 === io.dpath.mem_waddr || (io.fpu.dec.ren1 && id_raddr1 === io.dpath.mem_waddr ||
io.fpu.dec.ren2 && id_raddr2 === io.dpath.mem_waddr || io.fpu.dec.ren2 && id_raddr2 === io.dpath.mem_waddr ||
@@ -683,9 +689,9 @@ class Control(implicit conf: RocketConfiguration) extends Module
val id_wb_hazard = fp_data_hazard_wb && (wb_dcache_miss || wb_reg_fp_val) val id_wb_hazard = fp_data_hazard_wb && (wb_dcache_miss || wb_reg_fp_val)
val id_sboard_hazard = val id_sboard_hazard =
(id_raddr1 != UInt(0) && id_renx1 && sboard.readBypassed(id_raddr1) || (id_renx1_not0 && sboard.readBypassed(id_raddr1) ||
id_raddr2 != UInt(0) && id_renx2 && sboard.readBypassed(id_raddr2) || id_renx2_not0 && sboard.readBypassed(id_raddr2) ||
id_waddr != UInt(0) && id_wen && sboard.readBypassed(id_waddr)) id_wen_not0 && sboard.readBypassed(id_waddr))
val ctrl_stalld = val ctrl_stalld =
id_ex_hazard || id_mem_hazard || id_wb_hazard || id_sboard_hazard || id_ex_hazard || id_mem_hazard || id_wb_hazard || id_sboard_hazard ||

4
rocket/src/main/scala/dpath.scala
View File

@@ -281,7 +281,9 @@ class Datapath(implicit conf: RocketConfiguration) extends Module
// processor control regfile write // processor control regfile write
pcr.io.rw.addr := wb_reg_inst(31,20) pcr.io.rw.addr := wb_reg_inst(31,20)
pcr.io.rw.cmd := io.ctrl.csr pcr.io.rw.cmd := io.ctrl.csr
pcr.io.rw.wdata := wb_reg_wdata pcr.io.rw.wdata := Mux(io.ctrl.csr === CSR.S, pcr.io.rw.rdata | wb_reg_wdata,
Mux(io.ctrl.csr === CSR.C, pcr.io.rw.rdata & ~wb_reg_wdata,
wb_reg_wdata))
io.rocc.cmd.bits.inst := new RoCCInstruction().fromBits(wb_reg_inst) io.rocc.cmd.bits.inst := new RoCCInstruction().fromBits(wb_reg_inst)
io.rocc.cmd.bits.rs1 := wb_reg_wdata io.rocc.cmd.bits.rs1 := wb_reg_wdata

51
rocket/src/main/scala/dpath_util.scala
View File

@@ -98,14 +98,14 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
val ptbr = UInt(OUTPUT, PADDR_BITS) val ptbr = UInt(OUTPUT, PADDR_BITS)
val evec = UInt(OUTPUT, VADDR_BITS+1) val evec = UInt(OUTPUT, VADDR_BITS+1)
val exception = Bool(INPUT) val exception = Bool(INPUT)
val retire = Bool(INPUT) val retire = UInt(INPUT, log2Up(1+conf.retireWidth))
val cause = UInt(INPUT, 6) val cause = UInt(INPUT, conf.xprlen)
val badvaddr_wen = Bool(INPUT) val badvaddr_wen = Bool(INPUT)
val pc = UInt(INPUT, VADDR_BITS+1) val pc = UInt(INPUT, VADDR_BITS+1)
val sret = Bool(INPUT) val sret = Bool(INPUT)
val fatc = Bool(OUTPUT) val fatc = Bool(OUTPUT)
val replay = Bool(OUTPUT) val replay = Bool(OUTPUT)
val time = UInt(OUTPUT, 64) val time = UInt(OUTPUT, conf.xprlen)
val fcsr_rm = Bits(OUTPUT, FPConstants.RM_SZ) val fcsr_rm = Bits(OUTPUT, FPConstants.RM_SZ)
val fcsr_flags = Valid(Bits(width = FPConstants.FLAGS_SZ)).flip val fcsr_flags = Valid(Bits(width = FPConstants.FLAGS_SZ)).flip
} }
@@ -114,7 +114,7 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
val reg_badvaddr = Reg(Bits(width = VADDR_BITS)) val reg_badvaddr = Reg(Bits(width = VADDR_BITS))
val reg_evec = Reg(Bits(width = VADDR_BITS)) val reg_evec = Reg(Bits(width = VADDR_BITS))
val reg_compare = Reg(Bits(width = 32)) val reg_compare = Reg(Bits(width = 32))
val reg_cause = Reg(Bits(width = io.cause.getWidth)) val reg_cause = Reg(Bits(width = conf.xprlen))
val reg_tohost = Reg(init=Bits(0, conf.xprlen)) val reg_tohost = Reg(init=Bits(0, conf.xprlen))
val reg_fromhost = Reg(init=Bits(0, conf.xprlen)) val reg_fromhost = Reg(init=Bits(0, conf.xprlen))
val reg_sup0 = Reg(Bits(width = conf.xprlen)) val reg_sup0 = Reg(Bits(width = conf.xprlen))
@@ -122,8 +122,8 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
val reg_ptbr = Reg(UInt(width = PADDR_BITS)) val reg_ptbr = Reg(UInt(width = PADDR_BITS))
val reg_stats = Reg(init=Bool(false)) val reg_stats = Reg(init=Bool(false))
val reg_status = Reg(new Status) // reset down below val reg_status = Reg(new Status) // reset down below
val reg_time = WideCounter(64) val reg_time = WideCounter(conf.xprlen)
val reg_instret = WideCounter(64, io.retire) val reg_instret = WideCounter(conf.xprlen, io.retire)
val reg_fflags = Reg(UInt(width = 5)) val reg_fflags = Reg(UInt(width = 5))
val reg_frm = Reg(UInt(width = 3)) val reg_frm = Reg(UInt(width = 3))
@@ -208,7 +208,6 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
val read_impl = Bits(2) val read_impl = Bits(2)
val read_ptbr = reg_ptbr(PADDR_BITS-1,PGIDX_BITS) << PGIDX_BITS val read_ptbr = reg_ptbr(PADDR_BITS-1,PGIDX_BITS) << PGIDX_BITS
val read_cause = reg_cause(reg_cause.getWidth-1) << conf.xprlen-1 | reg_cause(reg_cause.getWidth-2,0)
val read_mapping = Map[Int,Bits]( val read_mapping = Map[Int,Bits](
CSRs.fflags -> (if (conf.fpu) reg_fflags else UInt(0)), CSRs.fflags -> (if (conf.fpu) reg_fflags else UInt(0)),
@@ -226,7 +225,7 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
CSRs.count -> reg_time, CSRs.count -> reg_time,
CSRs.compare -> reg_compare, CSRs.compare -> reg_compare,
CSRs.evec -> reg_evec, CSRs.evec -> reg_evec,
CSRs.cause -> read_cause, CSRs.cause -> reg_cause,
CSRs.status -> io.status.toBits, CSRs.status -> io.status.toBits,
CSRs.hartid -> io.host.id, CSRs.hartid -> io.host.id,
CSRs.impl -> read_impl, CSRs.impl -> read_impl,
@@ -246,11 +245,7 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
when (wen) { when (wen) {
when (decoded_addr(CSRs.status)) { when (decoded_addr(CSRs.status)) {
val sr_wdata = Mux(io.rw.cmd === CSR.S, reg_status.toBits | wdata, reg_status := new Status().fromBits(wdata)
Mux(io.rw.cmd === CSR.C, reg_status.toBits & ~wdata,
wdata))
reg_status := new Status().fromBits(sr_wdata)
reg_status.s64 := true reg_status.s64 := true
reg_status.u64 := true reg_status.u64 := true
reg_status.zero := 0 reg_status.zero := 0
@@ -258,22 +253,20 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
if (conf.rocc.isEmpty) reg_status.er := false if (conf.rocc.isEmpty) reg_status.er := false
if (!conf.fpu) reg_status.ef := false if (!conf.fpu) reg_status.ef := false
} }
when (io.rw.cmd != CSR.C && io.rw.cmd != CSR.S) { when (decoded_addr(CSRs.fflags)) { reg_fflags := wdata }
when (decoded_addr(CSRs.fflags)) { reg_fflags := wdata } when (decoded_addr(CSRs.frm)) { reg_frm := wdata }
when (decoded_addr(CSRs.frm)) { reg_frm := wdata } when (decoded_addr(CSRs.fcsr)) { reg_fflags := wdata; reg_frm := wdata >> reg_fflags.getWidth }
when (decoded_addr(CSRs.fcsr)) { reg_fflags := wdata; reg_frm := wdata >> reg_fflags.getWidth } when (decoded_addr(CSRs.epc)) { reg_epc := wdata(VADDR_BITS,0).toSInt }
when (decoded_addr(CSRs.epc)) { reg_epc := wdata(VADDR_BITS,0).toSInt } when (decoded_addr(CSRs.evec)) { reg_evec := wdata(VADDR_BITS-1,0).toSInt }
when (decoded_addr(CSRs.evec)) { reg_evec := wdata(VADDR_BITS-1,0).toSInt } when (decoded_addr(CSRs.count)) { reg_time := wdata.toUInt }
when (decoded_addr(CSRs.count)) { reg_time := wdata.toUInt } when (decoded_addr(CSRs.compare)) { reg_compare := wdata(31,0).toUInt; r_irq_timer := Bool(false) }
when (decoded_addr(CSRs.compare)) { reg_compare := wdata(31,0).toUInt; r_irq_timer := Bool(false) } when (decoded_addr(CSRs.fromhost)) { when (reg_fromhost === UInt(0) || !host_pcr_req_fire) { reg_fromhost := wdata } }
when (decoded_addr(CSRs.fromhost)) { when (reg_fromhost === UInt(0) || !host_pcr_req_fire) { reg_fromhost := wdata } } when (decoded_addr(CSRs.tohost)) { when (reg_tohost === UInt(0) || host_pcr_req_fire) { reg_tohost := wdata } }
when (decoded_addr(CSRs.tohost)) { when (reg_tohost === UInt(0) || host_pcr_req_fire) { reg_tohost := wdata } } when (decoded_addr(CSRs.clear_ipi)){ r_irq_ipi := wdata(0) }
when (decoded_addr(CSRs.clear_ipi)){ r_irq_ipi := wdata(0) } when (decoded_addr(CSRs.sup0)) { reg_sup0 := wdata }
when (decoded_addr(CSRs.sup0)) { reg_sup0 := wdata } when (decoded_addr(CSRs.sup1)) { reg_sup1 := wdata }
when (decoded_addr(CSRs.sup1)) { reg_sup1 := wdata } when (decoded_addr(CSRs.ptbr)) { reg_ptbr := Cat(wdata(PADDR_BITS-1, PGIDX_BITS), Bits(0, PGIDX_BITS)).toUInt }
when (decoded_addr(CSRs.ptbr)) { reg_ptbr := Cat(wdata(PADDR_BITS-1, PGIDX_BITS), Bits(0, PGIDX_BITS)).toUInt } when (decoded_addr(CSRs.stats)) { reg_stats := wdata(0) }
when (decoded_addr(CSRs.stats)) { reg_stats := wdata(0) }
}
} }
io.host.ipi_rep.ready := Bool(true) io.host.ipi_rep.ready := Bool(true)

11
rocket/src/main/scala/fpu.scala
View File

@@ -212,6 +212,7 @@ class FPToInt extends Module
val unrec_s = hardfloat.recodedFloatNToFloatN(in.in1, 23, 9) val unrec_s = hardfloat.recodedFloatNToFloatN(in.in1, 23, 9)
val unrec_d = hardfloat.recodedFloatNToFloatN(in.in1, 52, 12) val unrec_d = hardfloat.recodedFloatNToFloatN(in.in1, 52, 12)
val unrec_out = Mux(in.single, Cat(Fill(32, unrec_s(31)), unrec_s), unrec_d)
val dcmp = Module(new hardfloat.recodedFloatNCompare(52, 12)) val dcmp = Module(new hardfloat.recodedFloatNCompare(52, 12))
dcmp.io.a := in.in1 dcmp.io.a := in.in1
@@ -221,7 +222,8 @@ class FPToInt extends Module
val d2i = hardfloat.recodedFloatNToAny(in.in1, in.rm, ~in.cmd(1,0), 52, 12, 64) val d2i = hardfloat.recodedFloatNToAny(in.in1, in.rm, ~in.cmd(1,0), 52, 12, 64)
io.out.bits.toint := Mux(in.single, Cat(Fill(32, unrec_s(31)), unrec_s), unrec_d) io.out.bits.toint := unrec_out
io.out.bits.store := unrec_out
io.out.bits.exc := Bits(0) io.out.bits.exc := Bits(0)
when (in.cmd === FCMD_CVT_W_FMT || in.cmd === FCMD_CVT_WU_FMT) { when (in.cmd === FCMD_CVT_W_FMT || in.cmd === FCMD_CVT_WU_FMT) {
@@ -238,7 +240,6 @@ class FPToInt extends Module
} }
io.out.valid := valid io.out.valid := valid
io.out.bits.store := Mux(in.single, Cat(unrec_d(63,32), unrec_s), unrec_d)
io.out.bits.lt := dcmp.io.a_lt_b io.out.bits.lt := dcmp.io.a_lt_b
} }
@@ -268,7 +269,7 @@ class IntToFP(val latency: Int) extends Module
mux.exc := Bits(0) mux.exc := Bits(0)
mux.data := hardfloat.floatNToRecodedFloatN(in.bits.data, 52, 12) mux.data := hardfloat.floatNToRecodedFloatN(in.bits.data, 52, 12)
when (in.bits.single) { when (in.bits.single) {
mux.data := hardfloat.floatNToRecodedFloatN(in.bits.data, 23, 9) mux.data := Cat(SInt(-1, 32), hardfloat.floatNToRecodedFloatN(in.bits.data, 23, 9))
} }
when (in.bits.cmd === FCMD_CVT_FMT_W || in.bits.cmd === FCMD_CVT_FMT_WU || when (in.bits.cmd === FCMD_CVT_FMT_W || in.bits.cmd === FCMD_CVT_FMT_WU ||
@@ -463,7 +464,7 @@ class FPU(sfma_latency: Int, dfma_latency: Int) extends Module
val load_wb_tag = RegEnable(io.dpath.dmem_resp_tag, io.dpath.dmem_resp_val) val load_wb_tag = RegEnable(io.dpath.dmem_resp_tag, io.dpath.dmem_resp_val)
val rec_s = hardfloat.floatNToRecodedFloatN(load_wb_data, 23, 9) val rec_s = hardfloat.floatNToRecodedFloatN(load_wb_data, 23, 9)
val rec_d = hardfloat.floatNToRecodedFloatN(load_wb_data, 52, 12) val rec_d = hardfloat.floatNToRecodedFloatN(load_wb_data, 52, 12)
val load_wb_data_recoded = Mux(load_wb_single, Cat(SInt(-1), rec_s), rec_d) val load_wb_data_recoded = Mux(load_wb_single, Cat(SInt(-1, 32), rec_s), rec_d)
// regfile // regfile
val regfile = Mem(Bits(width = 65), 32) val regfile = Mem(Bits(width = 65), 32)
@@ -525,7 +526,7 @@ class FPU(sfma_latency: Int, dfma_latency: Int) extends Module
val pipes = List( val pipes = List(
Pipe(fpmu, fpmu.latency, (c: FPUCtrlSigs) => c.fastpipe, fpmu.io.out.bits.data, fpmu.io.out.bits.exc), Pipe(fpmu, fpmu.latency, (c: FPUCtrlSigs) => c.fastpipe, fpmu.io.out.bits.data, fpmu.io.out.bits.exc),
Pipe(ifpu, ifpu.latency, (c: FPUCtrlSigs) => c.fromint, ifpu.io.out.bits.data, ifpu.io.out.bits.exc), Pipe(ifpu, ifpu.latency, (c: FPUCtrlSigs) => c.fromint, ifpu.io.out.bits.data, ifpu.io.out.bits.exc),
Pipe(sfma, sfma.latency, (c: FPUCtrlSigs) => c.fma && c.single, sfma.io.out, sfma.io.exc), Pipe(sfma, sfma.latency, (c: FPUCtrlSigs) => c.fma && c.single, Cat(SInt(-1, 32), sfma.io.out), sfma.io.exc),
Pipe(dfma, dfma.latency, (c: FPUCtrlSigs) => c.fma && !c.single, dfma.io.out, dfma.io.exc)) Pipe(dfma, dfma.latency, (c: FPUCtrlSigs) => c.fma && !c.single, dfma.io.out, dfma.io.exc))
def latencyMask(c: FPUCtrlSigs, offset: Int) = { def latencyMask(c: FPUCtrlSigs, offset: Int) = {
require(pipes.forall(_.lat >= offset)) require(pipes.forall(_.lat >= offset))

4
rocket/src/main/scala/icache.scala
View File

@@ -5,11 +5,11 @@ import uncore._
import Util._ import Util._
case class ICacheConfig(sets: Int, assoc: Int, case class ICacheConfig(sets: Int, assoc: Int,
ibytes: Int = 4,
ntlb: Int = 8, nbtb: Int = 8, ntlb: Int = 8, nbtb: Int = 8,
code: Code = new IdentityCode) code: Code = new IdentityCode)
{ {
val w = 1 val w = 1
val ibytes = 4
val dm = assoc == 1 val dm = assoc == 1
val lines = sets * assoc val lines = sets * assoc
@@ -248,7 +248,7 @@ class ICache(implicit c: ICacheConfig, tl: TileLinkConfiguration) extends Module
io.resp.bits.datablock := Mux1H(s2_tag_hit, s2_dout) io.resp.bits.datablock := Mux1H(s2_tag_hit, s2_dout)
val finish_q = Module(new Queue(new GrantAck, 1)) val finish_q = Module(new Queue(new GrantAck, 1))
finish_q.io.enq.valid := refill_done && tl.co.requiresAck(io.mem.grant.bits.payload) finish_q.io.enq.valid := refill_done && tl.co.requiresAckForGrant(io.mem.grant.bits.payload.g_type)
finish_q.io.enq.bits.master_xact_id := io.mem.grant.bits.payload.master_xact_id finish_q.io.enq.bits.master_xact_id := io.mem.grant.bits.payload.master_xact_id
// output signals // output signals

34
rocket/src/main/scala/instructions.scala
View File

@@ -5,14 +5,14 @@ import Node._
/* Automatically generated by parse-opcodes */ /* Automatically generated by parse-opcodes */
object Instructions { object Instructions {
def JAL = Bits("b?????????????????????????1101111")
def JALR = Bits("b?????????????????000?????1100111")
def BEQ = Bits("b?????????????????000?????1100011") def BEQ = Bits("b?????????????????000?????1100011")
def BNE = Bits("b?????????????????001?????1100011") def BNE = Bits("b?????????????????001?????1100011")
def BLT = Bits("b?????????????????100?????1100011") def BLT = Bits("b?????????????????100?????1100011")
def BGE = Bits("b?????????????????101?????1100011") def BGE = Bits("b?????????????????101?????1100011")
def BLTU = Bits("b?????????????????110?????1100011") def BLTU = Bits("b?????????????????110?????1100011")
def BGEU = Bits("b?????????????????111?????1100011") def BGEU = Bits("b?????????????????111?????1100011")
def JALR = Bits("b?????????????????000?????1100111")
def JAL = Bits("b?????????????????????????1101111")
def LUI = Bits("b?????????????????????????0110111") def LUI = Bits("b?????????????????????????0110111")
def AUIPC = Bits("b?????????????????????????0010111") def AUIPC = Bits("b?????????????????????????0010111")
def ADDI = Bits("b?????????????????000?????0010011") def ADDI = Bits("b?????????????????000?????0010011")
@@ -185,6 +185,36 @@ object Instructions {
def CUSTOM3_RD_RS1 = Bits("b?????????????????110?????1111011") def CUSTOM3_RD_RS1 = Bits("b?????????????????110?????1111011")
def CUSTOM3_RD_RS1_RS2 = Bits("b?????????????????111?????1111011") def CUSTOM3_RD_RS1_RS2 = Bits("b?????????????????111?????1111011")
} }
object Causes {
val misaligned_fetch = 0x0
val fault_fetch = 0x1
val illegal_instruction = 0x2
val privileged_instruction = 0x3
val fp_disabled = 0x4
val syscall = 0x6
val breakpoint = 0x7
val misaligned_load = 0x8
val misaligned_store = 0x9
val fault_load = 0xa
val fault_store = 0xb
val accelerator_disabled = 0xc
val all = {
val res = collection.mutable.ArrayBuffer[Int]()
res += misaligned_fetch
res += fault_fetch
res += illegal_instruction
res += privileged_instruction
res += fp_disabled
res += syscall
res += breakpoint
res += misaligned_load
res += misaligned_store
res += fault_load
res += fault_store
res += accelerator_disabled
res.toArray
}
}
object CSRs { object CSRs {
val fflags = 0x1 val fflags = 0x1
val frm = 0x2 val frm = 0x2

6
rocket/src/main/scala/nbdcache.scala
View File

@@ -260,7 +260,7 @@ class MSHR(id: Int)(implicit conf: DCacheConfig, tl: TileLinkConfiguration) exte
} }
val ackq = Module(new Queue(new LogicalNetworkIO(new GrantAck), 1)) val ackq = Module(new Queue(new LogicalNetworkIO(new GrantAck), 1))
ackq.io.enq.valid := (wb_done || refill_done) && tl.co.requiresAck(io.mem_grant.bits.payload) ackq.io.enq.valid := (wb_done || refill_done) && tl.co.requiresAckForGrant(io.mem_grant.bits.payload.g_type)
ackq.io.enq.bits.payload.master_xact_id := io.mem_grant.bits.payload.master_xact_id ackq.io.enq.bits.payload.master_xact_id := io.mem_grant.bits.payload.master_xact_id
ackq.io.enq.bits.header.dst := io.mem_grant.bits.header.src ackq.io.enq.bits.header.dst := io.mem_grant.bits.header.src
val can_finish = state === s_invalid || state === s_refill_req || state === s_refill_resp val can_finish = state === s_invalid || state === s_refill_req || state === s_refill_resp
@@ -686,12 +686,12 @@ class AMOALU(implicit conf: DCacheConfig) extends Module {
class HellaCacheReq(implicit val conf: DCacheConfig) extends DCacheBundle { class HellaCacheReq(implicit val conf: DCacheConfig) extends DCacheBundle {
val kill = Bool() val kill = Bool()
val typ = Bits(width = 3) val typ = Bits(width = MT_SZ)
val phys = Bool() val phys = Bool()
val addr = UInt(width = conf.maxaddrbits) val addr = UInt(width = conf.maxaddrbits)
val data = Bits(width = conf.databits) val data = Bits(width = conf.databits)
val tag = Bits(width = conf.reqtagbits) val tag = Bits(width = conf.reqtagbits)
val cmd = Bits(width = 4) val cmd = Bits(width = M_SZ)
} }
class HellaCacheResp(implicit val conf: DCacheConfig) extends DCacheBundle { class HellaCacheResp(implicit val conf: DCacheConfig) extends DCacheBundle {

1
rocket/src/main/scala/package.scala
View File

@@ -1,6 +1,5 @@
package object rocket extends package object rocket extends
rocket.constants.ScalarOpConstants with rocket.constants.ScalarOpConstants with
rocket.constants.InterruptConstants with
rocket.constants.VectorOpConstants rocket.constants.VectorOpConstants
{ {
val START_ADDR = 0x2000 val START_ADDR = 0x2000

4
rocket/src/main/scala/tile.scala
View File

@@ -7,6 +7,7 @@ import Util._
case class RocketConfiguration(tl: TileLinkConfiguration, case class RocketConfiguration(tl: TileLinkConfiguration,
icache: ICacheConfig, dcache: DCacheConfig, icache: ICacheConfig, dcache: DCacheConfig,
fpu: Boolean, rocc: Option[RocketConfiguration => RoCC] = None, fpu: Boolean, rocc: Option[RocketConfiguration => RoCC] = None,
retireWidth: Int = 1,
vm: Boolean = true, vm: Boolean = true,
fastLoadWord: Boolean = true, fastLoadWord: Boolean = true,
fastLoadByte: Boolean = false, fastLoadByte: Boolean = false,
@@ -19,7 +20,7 @@ case class RocketConfiguration(tl: TileLinkConfiguration,
if (fastLoadByte) require(fastLoadWord) if (fastLoadByte) require(fastLoadWord)
} }
class Tile(resetSignal: Bool = null)(confIn: RocketConfiguration) extends Module(_reset = resetSignal) with ClientCoherenceAgent class Tile(resetSignal: Bool = null)(confIn: RocketConfiguration) extends Module(_reset = resetSignal)
{ {
val memPorts = 2 + !confIn.rocc.isEmpty // Number of ports to outer memory system from tile: 1 from I$, 1 from D$, maybe 1 from Rocc val memPorts = 2 + !confIn.rocc.isEmpty // Number of ports to outer memory system from tile: 1 from I$, 1 from D$, maybe 1 from Rocc
val dcachePortId = 0 val dcachePortId = 0
@@ -31,6 +32,7 @@ class Tile(resetSignal: Bool = null)(confIn: RocketConfiguration) extends Module
implicit val icConf = confIn.icache implicit val icConf = confIn.icache
implicit val dcConf = confIn.dcache.copy(reqtagbits = confIn.dcacheReqTagBits + log2Up(dcachePorts), databits = confIn.xprlen) implicit val dcConf = confIn.dcache.copy(reqtagbits = confIn.dcacheReqTagBits + log2Up(dcachePorts), databits = confIn.xprlen)
implicit val conf = confIn.copy(dcache = dcConf) implicit val conf = confIn.copy(dcache = dcConf)
require(conf.retireWidth == 1) // for now...
val io = new Bundle { val io = new Bundle {
val tilelink = new TileLinkIO val tilelink = new TileLinkIO

16
rocket/src/main/scala/util.scala
View File

@@ -109,17 +109,21 @@ object Split
} }
// a counter that clock gates most of its MSBs using the LSB carry-out // a counter that clock gates most of its MSBs using the LSB carry-out
case class WideCounter(width: Int, inc: Bool = Bool(true)) case class WideCounter(width: Int, inc: UInt = UInt(1))
{ {
private val isWide = width >= 4 require(inc.getWidth > 0)
private val smallWidth = if (isWide) log2Up(width) else width private val isWide = width > 2*inc.getWidth
private val smallWidth = if (isWide) inc.getWidth max log2Up(width) else width
private val small = Reg(init=UInt(0, smallWidth)) private val small = Reg(init=UInt(0, smallWidth))
private val nextSmall = small + UInt(1, smallWidth+1) private val doInc = inc.orR
when (inc) { small := nextSmall(smallWidth-1,0) } private val nextSmall =
if (inc.getWidth == 1) small + UInt(1, smallWidth+1)
else Cat(UInt(0,1), small) + inc
when (doInc) { small := nextSmall(smallWidth-1,0) }
private val large = if (isWide) { private val large = if (isWide) {
val r = Reg(init=UInt(0, width - smallWidth)) val r = Reg(init=UInt(0, width - smallWidth))
when (inc && nextSmall(smallWidth)) { r := r + UInt(1) } when (doInc && nextSmall(smallWidth)) { r := r + UInt(1) }
r r
} else null } else null