riscv/rocket-chip
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parameterize the scoreboards

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This commit is contained in:
Andrew Waterman 2012-02-13 18:12:23 -08:00
parent 6c2d8a37ae
commit 0366465cb1
2 changed files with 52 additions and 52 deletions
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52
rocket/src/main/scala/ctrl.scala
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@ -517,40 +517,44 @@ class rocketCtrl extends Component
wb_reg_fp_val := mem_reg_fp_val wb_reg_fp_val := mem_reg_fp_val
} }
val sboard = new rocketCtrlSboard(); val sboard = new rocketCtrlSboard(32, 3, 2);
sboard.io.raddra := id_raddr2.toUFix; sboard.io.r(0).addr := id_raddr2.toUFix;
sboard.io.raddrb := id_raddr1.toUFix; sboard.io.r(1).addr := id_raddr1.toUFix;
sboard.io.raddrc := id_waddr.toUFix; sboard.io.r(2).addr := id_waddr.toUFix;
// scoreboard set (for D$ misses, div, mul) // scoreboard set (for D$ misses, div, mul)
sboard.io.set := wb_reg_div_mul_val || wb_reg_dcache_miss && wb_reg_wen; sboard.io.w(0).en := wb_reg_div_mul_val || wb_reg_dcache_miss && wb_reg_wen
sboard.io.seta := io.dpath.wb_waddr; sboard.io.w(0).data := Bool(true)
sboard.io.w(0).addr := io.dpath.wb_waddr
sboard.io.clr := io.dpath.sboard_clr; sboard.io.w(1).en := io.dpath.sboard_clr
sboard.io.clra := io.dpath.sboard_clra; sboard.io.w(1).data := Bool(false)
sboard.io.w(1).addr := io.dpath.sboard_clra
val id_stall_raddr2 = id_renx2.toBool && sboard.io.stalla; val id_stall_raddr2 = id_renx2.toBool && sboard.io.r(0).data
val id_stall_raddr1 = id_renx1.toBool && sboard.io.stallb; val id_stall_raddr1 = id_renx1.toBool && sboard.io.r(1).data
val id_stall_waddr = id_wen.toBool && sboard.io.stallc; val id_stall_waddr = id_wen.toBool && sboard.io.r(2).data
var id_stall_fpu = Bool(false) var id_stall_fpu = Bool(false)
if (HAVE_FPU) { if (HAVE_FPU) {
val fp_sboard = new rocketCtrlSboard(); val fp_sboard = new rocketCtrlSboard(32, 4, 2);
fp_sboard.io.raddra := id_raddr1.toUFix; fp_sboard.io.r(0).addr := id_raddr1.toUFix
fp_sboard.io.raddrb := id_raddr2.toUFix; fp_sboard.io.r(1).addr := id_raddr2.toUFix
fp_sboard.io.raddrc := id_raddr3.toUFix; fp_sboard.io.r(2).addr := id_raddr3.toUFix
fp_sboard.io.raddrd := id_waddr.toUFix; fp_sboard.io.r(3).addr := id_waddr.toUFix
fp_sboard.io.set := wb_reg_dcache_miss && wb_reg_fp_wen; fp_sboard.io.w(0).en := wb_reg_dcache_miss && wb_reg_fp_wen
fp_sboard.io.seta := io.dpath.wb_waddr; fp_sboard.io.w(0).data := Bool(true)
fp_sboard.io.w(0).addr := io.dpath.wb_waddr
fp_sboard.io.clr := io.dpath.fp_sboard_clr; fp_sboard.io.w(1).en := io.dpath.fp_sboard_clr
fp_sboard.io.clra := io.dpath.fp_sboard_clra; fp_sboard.io.w(1).data := Bool(false)
fp_sboard.io.w(1).addr := io.dpath.fp_sboard_clra
id_stall_fpu = io.fpu.dec.ren1 && fp_sboard.io.stalla || id_stall_fpu = io.fpu.dec.ren1 && fp_sboard.io.r(0).data ||
io.fpu.dec.ren2 && fp_sboard.io.stallb || io.fpu.dec.ren2 && fp_sboard.io.r(1).data ||
io.fpu.dec.ren3 && fp_sboard.io.stallc || io.fpu.dec.ren3 && fp_sboard.io.r(2).data ||
io.fpu.dec.wen && fp_sboard.io.stalld io.fpu.dec.wen && fp_sboard.io.r(3).data
} }
// exception handling // exception handling

54
rocket/src/main/scala/ctrl_util.scala
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@ -2,35 +2,31 @@ package Top
import Chisel._ import Chisel._
import Node._; import Node._;
import Constants._;
class ioCtrlSboard extends Bundle() class rocketCtrlSboard(entries: Int, nread: Int, nwrite: Int) extends Component
{ {
val clr = Bool(INPUT); class read_port extends Bundle {
val clra = UFix(5, INPUT); val addr = UFix(log2up(entries), INPUT)
val set = Bool(INPUT); val data = Bool(OUTPUT)
val seta = UFix(5, INPUT); }
val raddra = UFix(5, INPUT); class write_port extends Bundle {
val raddrb = UFix(5, INPUT); val en = Bool(INPUT)
val raddrc = UFix(5, INPUT); val addr = UFix(log2up(entries), INPUT)
val raddrd = UFix(5, INPUT); val data = Bool(INPUT)
val stalla = Bool(OUTPUT); }
val stallb = Bool(OUTPUT);
val stallc = Bool(OUTPUT); val io = new Bundle {
val stalld = Bool(OUTPUT); val r = Vec(nread) { new read_port() }
} val w = Vec(nwrite) { new write_port() }
}
class rocketCtrlSboard extends Component
{ val busybits = Reg(resetVal = Bits(0, entries));
override val io = new ioCtrlSboard();
val reg_busy = Reg(resetVal = Bits(0, 32)); for (i <- 0 until nread)
io.r(i).data := busybits(io.r(i).addr)
val set_mask = io.set.toUFix << io.seta;
val clr_mask = ~(io.clr.toUFix << io.clra); var wdata = busybits
reg_busy := (reg_busy | set_mask) & clr_mask for (i <- 0 until nwrite)
wdata = wdata.bitSet(io.w(i).addr, Mux(io.w(i).en, io.w(i).data, wdata(io.w(i).addr)))
io.stalla := reg_busy(io.raddra).toBool; busybits := wdata
io.stallb := reg_busy(io.raddrb).toBool;
io.stallc := reg_busy(io.raddrc).toBool;
io.stalld := reg_busy(io.raddrd).toBool;
} }