riscv/rocket-chip
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dcache tweaks

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This commit is contained in:
Rimas Avizienis 2011-10-31 16:47:31 -07:00
parent 172e561a78
commit 65f8b2461c
1 changed files with 24 additions and 23 deletions
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47
rocket/src/main/scala/dcache.scala
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@ -266,9 +266,9 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
val r_cpu_req_addr = Reg(resetVal = Bits(0, addrbits));
val r_cpu_req_val = Reg(resetVal = Bool(false));
// val r_cpu_req_data = Reg(resetVal = Bits(0,64));
val r_cpu_req_data = Reg(resetVal = Bits(0,64));
val r_cpu_req_op = Reg(resetVal = Bits(0,4));
// val r_cpu_req_wmask = Reg(resetVal = Bits(0,8));
val r_cpu_req_wmask = Reg(resetVal = Bits(0,8));
val r_cpu_req_tag = Reg(resetVal = Bits(0,12));
val p_store_data = Reg(resetVal = Bits(0,64));
@ -282,18 +282,11 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
when (io.cpu.req_val && io.cpu.req_rdy) {
r_cpu_req_addr <== io.cpu.req_addr;
// r_cpu_req_data <== io.cpu.req_data;
r_cpu_req_data <== io.cpu.req_data;
r_cpu_req_op <== io.cpu.req_op;
// r_cpu_req_wmask <== io.cpu.req_wmask;
r_cpu_req_wmask <== io.cpu.req_wmask;
r_cpu_req_tag <== io.cpu.req_tag;
}
when (io.cpu.req_val && io.cpu.req_rdy && (io.cpu.req_op === M_XWR)) {
p_store_data <== io.cpu.req_data;
p_store_addr <== io.cpu.req_addr;
p_store_wmask <== io.cpu.req_wmask;
p_store_valid <== Bool(true);
}
when (io.cpu.req_rdy) {
r_cpu_req_val <== io.cpu.req_val;
@ -331,18 +324,25 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
val tag_valid = vb_rdata.toBool;
val tag_match = tag_valid && !req_flush && (tag_rdata === r_cpu_req_addr(tagmsb, taglsb));
val ldst_conflict = io.cpu.req_val && (io.cpu.req_op === M_XRD) && (io.cpu.req_addr === p_store_addr);
val store = ((state === s_ready) && p_store_valid && (!io.cpu.req_val || ldst_conflict || io.cpu.req_op === M_XWR)) ||
((state === s_resolve_miss) && req_store);
when ((state === s_ready) && r_cpu_req_val && req_store) {
p_store_data <== r_cpu_req_data;
p_store_addr <== r_cpu_req_addr;
p_store_wmask <== r_cpu_req_wmask;
p_store_valid <== Bool(true);
}
val addr_match = (r_cpu_req_addr(tagmsb, offsetlsb) === p_store_addr(tagmsb, offsetlsb));
val drain_store = ((state === s_ready) && p_store_valid && (!r_cpu_req_val || !req_load || addr_match))
val resolve_store = (state === s_resolve_miss) && req_store;
val do_store = drain_store | resolve_store;
// dirty bit array
val db_array = Reg(resetVal = Bits(0, lines));
val db_rdata = Reg(db_array(tag_raddr));
val tag_dirty = db_rdata.toBool;
when (store) {
when (do_store) {
p_store_valid <== Bool(false);
db_array <== db_array.bitSet(p_store_addr(indexmsb, indexlsb).toUFix, UFix(1,1));
}
@ -351,7 +351,7 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
}
// data array
val data_array_we = ((state === s_refill) && io.mem.resp_val) || store;
val data_array_we = ((state === s_refill) && io.mem.resp_val) || do_store;
val data_array_waddr =
Mux((state === s_refill), Cat(r_cpu_req_addr(indexmsb, indexlsb), rr_count).toUFix,
p_store_addr(indexmsb, offsetmsb-1).toUFix);
@ -382,15 +382,16 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
val data_array_raddr =
Mux((state === s_writeback) && io.mem.req_rdy, Cat(r_cpu_req_addr(indexmsb, indexlsb), rr_count_next).toUFix,
Mux((state === s_start_writeback) || (state === s_writeback), Cat(r_cpu_req_addr(indexmsb, indexlsb), rr_count).toUFix,
Mux((state === s_resolve_miss), r_cpu_req_addr(indexmsb, offsetmsb-1),
Mux((state === s_resolve_miss) || (state === s_replay_load), r_cpu_req_addr(indexmsb, offsetmsb-1),
io.cpu.req_addr(indexmsb, offsetmsb-1))));
val data_array_rdata = Reg(data_array.read(data_array_raddr));
val ldst_conflict = r_cpu_req_val && req_load && p_store_valid && addr_match;
// output signals
// io.cpu.req_rdy := (state === s_ready) && (!r_cpu_req_val || (tag_match && req_load && !(p_store_valid && (r_cpu_req_addr === p_store_addr))));
io.cpu.req_rdy := (state === s_ready) && (!r_cpu_req_val || tag_match) && !(p_store_valid && ldst_conflict);
io.cpu.req_rdy := (state === s_ready) && !ldst_conflict && (!r_cpu_req_val || tag_match);
io.cpu.resp_val := ((state === s_ready) && r_cpu_req_val && tag_match && req_load) ||
io.cpu.resp_val := ((state === s_ready) && r_cpu_req_val && tag_match && req_load && !(p_store_valid && addr_match)) ||
((state === s_resolve_miss) && req_flush);
io.cpu.resp_tag := r_cpu_req_tag;
@ -413,7 +414,7 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
state <== s_ready;
}
is (s_ready) {
when (p_store_valid && ldst_conflict) {
when (ldst_conflict) {
state <== s_replay_load;
}
when (!r_cpu_req_val || tag_match) {