riscv/rocket-chip
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Groundwork for assoc cache implementation

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This commit is contained in:
Henry Cook
2012-01-13 15:55:56 -08:00
parent 07f184df2f
commit 7e25749581
4 changed files with 31 additions and 17 deletions
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5
rocket/src/main/scala/dcache.scala
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@ -45,6 +45,11 @@ class ioDCacheDM extends Bundle() {
val mem = new ioDcache().flip();
}
class ioDCacheHella extends Bundle() {
val cpu = new ioDmem();
val mem = new ioDcache().flip();
}
class rocketDCacheStoreGen extends Component {
val io = new Bundle {
val req_type = Bits(3, INPUT);

31
rocket/src/main/scala/nbdcache.scala
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@ -541,7 +541,7 @@ class AMOALU extends Component {
}
class HellaCache(lines: Int) extends Component {
val io = new ioDCacheDM();
val io = new ioDCacheHella();
val addrbits = PADDR_BITS;
val indexbits = log2up(lines);
@ -602,6 +602,22 @@ class HellaCache(lines: Int) extends Component {
}
}
// refill counter
val rr_count = Reg(resetVal = UFix(0, log2up(REFILL_CYCLES)))
val rr_count_next = rr_count + UFix(1)
when (io.mem.resp_val) { rr_count <== rr_count_next }
val misaligned =
(((r_cpu_req_type === MT_H) || (r_cpu_req_type === MT_HU)) && (r_cpu_req_idx(0) != Bits(0))) ||
(((r_cpu_req_type === MT_W) || (r_cpu_req_type === MT_WU)) && (r_cpu_req_idx(1,0) != Bits(0))) ||
((r_cpu_req_type === MT_D) && (r_cpu_req_idx(2,0) != Bits(0)));
io.cpu.xcpt_ma_ld := r_cpu_req_val_ && r_req_read && misaligned
io.cpu.xcpt_ma_st := r_cpu_req_val_ && r_req_write && misaligned
}
class HellaCacheDM(lines: Int) extends HellaCache(lines) {
// tags
val meta = new MetaDataArray(lines)
val meta_arb = (new Arbiter(3)) { new MetaArrayReq() }
@ -632,11 +648,6 @@ class HellaCache(lines: Int) extends Component {
val tag_miss = r_cpu_req_val && !tag_match
val dirty = meta.io.resp.valid && meta.io.resp.dirty
// refill counter
val rr_count = Reg(resetVal = UFix(0, log2up(REFILL_CYCLES)))
val rr_count_next = rr_count + UFix(1)
when (io.mem.resp_val) { rr_count <== rr_count_next }
// refill response
val block_during_refill = !io.mem.resp_val && (rr_count != UFix(0))
data_arb.io.in(0).valid := io.mem.resp_val || block_during_refill
@ -791,14 +802,6 @@ class HellaCache(lines: Int) extends Component {
io.cpu.resp_data := loadgen.io.dout
io.cpu.resp_data_subword := loadgen.io.r_dout_subword
val misaligned =
(((r_cpu_req_type === MT_H) || (r_cpu_req_type === MT_HU)) && (r_cpu_req_idx(0) != Bits(0))) ||
(((r_cpu_req_type === MT_W) || (r_cpu_req_type === MT_WU)) && (r_cpu_req_idx(1,0) != Bits(0))) ||
((r_cpu_req_type === MT_D) && (r_cpu_req_idx(2,0) != Bits(0)));
io.cpu.xcpt_ma_ld := r_cpu_req_val_ && r_req_read && misaligned
io.cpu.xcpt_ma_st := r_cpu_req_val_ && r_req_write && misaligned
wb.io.mem_req.ready := io.mem.req_rdy
io.mem.req_val := wb.io.mem_req.valid
io.mem.req_rw := wb.io.mem_req.bits.rw

2
rocket/src/main/scala/top.scala
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@ -17,7 +17,7 @@ class Top() extends Component {
val cpu = new rocketProc();
val icache = new rocketICacheDM(128); // # 64 byte cache lines
val icache_pf = new rocketIPrefetcher();
val dcache = new HellaCache(128);
val dcache = new HellaCacheDM(128);
val arbiter = new rocketMemArbiter();
arbiter.io.mem ^^ io.mem;

10
rocket/src/main/scala/util.scala
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@ -2,8 +2,14 @@ package Top
{
import Chisel._
import Node._;
import scala.math._;
import Node._
import scala.math._
object foldR
{
def apply[T <: Bits](x: Seq[T], f: (T, T) => T): T =
if (x.length == 1) x(0) else f(x(0), foldR(x.slice(1, x.length), f))
}
object log2up
{