riscv/rocket-chip
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more tlb/ptw debugging

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This commit is contained in:
Rimas Avizienis
2011-11-12 00:25:06 -08:00
parent 44926866b7
commit 73416f224b
5 changed files with 81 additions and 52 deletions
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96
rocket/src/main/scala/icache.scala
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@ -8,9 +8,11 @@ import scala.math._;
// interface between I$ and pipeline/ITLB (32 bits wide)
class ioImem(view: List[String] = null) extends Bundle (view)
{
val req_addr = UFix(PADDR_BITS, 'input);
val itlb_miss = Bool('input);
val req_val = Bool('input);
val req_rdy = Bool('output);
val req_idx = Bits(PGIDX_BITS, 'input);
val req_ppn = Bits(PPN_BITS, 'input);
val resp_data = Bits(32, 'output);
val resp_val = Bool('output);
}
@ -45,8 +47,8 @@ class ioSRAMsp (width: Int, addrbits: Int) extends Bundle {
class rocketSRAMsp(entries: Int, width: Int) extends Component {
val addrbits = ceil(log10(entries)/log10(2)).toInt;
val io = new ioSRAMsp(width, addrbits);
val sram = Mem(entries, io.we && io.ce, io.a, io.d, wrMask = io.bweb, resetVal = null);
val rdata = Reg(sram.read(io.a));
val sram = Mem(entries, io.we, io.a, io.d, wrMask = io.bweb, resetVal = null);
val rdata = Reg(Mux(io.ce, sram.read(io.a), Bits(0,width)));
io.q := rdata;
}
@ -62,6 +64,7 @@ class rocketICacheDM(lines: Int) extends Component {
val offsetbits = 6;
val tagmsb = addrbits - 1;
val taglsb = indexbits+offsetbits;
val tagbits = addrbits-taglsb;
val indexmsb = taglsb-1;
val indexlsb = offsetbits;
val offsetmsb = indexlsb-1;
@ -71,18 +74,35 @@ class rocketICacheDM(lines: Int) extends Component {
val s_reset :: s_ready :: s_request :: s_refill_wait :: s_refill :: s_resolve_miss :: Nil = Enum(6) { UFix() };
val state = Reg(resetVal = s_reset);
val r_cpu_req_addr = Reg(Bits(0, addrbits));
when (io.cpu.req_val && ((state === s_ready) || (state === s_resolve_miss))) {
r_cpu_req_addr <== io.cpu.req_addr;
}
val r_cpu_req_idx = Reg(resetVal = Bits(0, PGIDX_BITS));
val r_cpu_req_ppn = Reg(resetVal = Bits(0, PPN_BITS));
val r_cpu_req_val = Reg(resetVal = Bool(false));
val r_cpu_req_val = Reg(Bool(false));
when ((state === s_ready) || (state === s_resolve_miss)) {
r_cpu_req_val <== io.cpu.req_val;
when (io.cpu.req_val && io.cpu.req_rdy) {
r_cpu_req_idx <== io.cpu.req_idx;
}
when (state === s_ready) {
r_cpu_req_ppn <== io.cpu.req_ppn;
}
when (io.cpu.req_rdy) {
r_cpu_req_val <== io.cpu.req_val;
}
otherwise {
r_cpu_req_val <== Bool(false);
}
// val r_cpu_req_addr = Reg(Bits(0, addrbits));
// when (io.cpu.req_val && ((state === s_ready) || (state === s_resolve_miss))) {
// r_cpu_req_addr <== io.cpu.req_addr;
// }
// val r_cpu_req_val = Reg(Bool(false));
// when ((state === s_ready) || (state === s_resolve_miss)) {
// r_cpu_req_val <== io.cpu.req_val;
// }
// otherwise {
// r_cpu_req_val <== Bool(false);
// }
val refill_count = Reg(resetVal = UFix(0,2));
when (io.mem.resp_val) {
@ -90,30 +110,33 @@ class rocketICacheDM(lines: Int) extends Component {
}
// tag array
val tagbits = addrbits-(indexbits+offsetbits);
val tag_array = new rocketSRAMsp(lines, tagbits);
tag_array.io.a :=
Mux((state === s_refill_wait), r_cpu_req_addr(indexmsb, indexlsb).toUFix, io.cpu.req_addr(indexmsb, indexlsb));
tag_array.io.d := r_cpu_req_addr(tagmsb, taglsb);
tag_array.io.we := (state === s_refill_wait) && io.mem.resp_val;
val tag_addr =
Mux((state === s_refill_wait), r_cpu_req_idx(PGIDX_BITS-1,offsetbits),
io.cpu.req_idx(PGIDX_BITS-1,offsetbits)).toUFix;
val tag_we = (state === s_refill_wait) && io.mem.resp_val;
tag_array.io.a := tag_addr;
tag_array.io.d := r_cpu_req_ppn;
tag_array.io.we := tag_we;
tag_array.io.bweb := ~Bits(0,tagbits);
tag_array.io.ce := Bool(true); // FIXME
val tag_lookup = tag_array.io.q;
tag_array.io.ce := (state === s_ready) && io.cpu.req_val;
val tag_rdata = tag_array.io.q;
// valid bit array
val vb_array = Reg(resetVal = Bits(0, lines));
val vb_rdata = Reg(vb_array(io.cpu.req_addr(indexmsb, indexlsb)));
when ((state === s_refill_wait) && io.mem.resp_val) {
vb_array <== vb_array.bitSet(r_cpu_req_addr(indexmsb, indexlsb).toUFix, UFix(1,1));
// val vb_rdata = Reg(vb_array(io.cpu.req_addr(indexmsb, indexlsb)));
when (tag_we) {
vb_array <== vb_array.bitSet(r_cpu_req_idx(PGIDX_BITS-1,offsetbits).toUFix, UFix(1,1));
}
val tag_match = vb_rdata.toBool && (tag_lookup === r_cpu_req_addr(tagmsb, taglsb));
val tag_valid = Reg(vb_array(tag_addr)).toBool;
val tag_match = (tag_rdata === io.cpu.req_ppn);
// data array
val data_array = new rocketSRAMsp(lines*4, 128);
data_array.io.a :=
Mux((state === s_refill_wait) || (state === s_refill), Cat(r_cpu_req_addr(indexmsb, indexlsb), refill_count),
io.cpu.req_addr(indexmsb, offsetmsb-1)).toUFix;
Mux((state === s_refill_wait) || (state === s_refill), Cat(r_cpu_req_idx(PGIDX_BITS-1, offsetbits), refill_count),
io.cpu.req_idx(PGIDX_BITS-1, offsetmsb-1)).toUFix;
data_array.io.d := io.mem.resp_data;
data_array.io.we := io.mem.resp_val;
data_array.io.bweb := ~Bits(0,128);
@ -121,16 +144,17 @@ class rocketICacheDM(lines: Int) extends Component {
val data_array_rdata = data_array.io.q;
// output signals
io.cpu.resp_val := (r_cpu_req_val && tag_match && (state === s_ready)); // || (state === s_resolve_miss);
io.cpu.req_rdy := ((state === s_ready) && (!r_cpu_req_val || (r_cpu_req_val && tag_match))); // || (state === s_resolve_miss);
io.cpu.resp_data :=
MuxLookup(r_cpu_req_addr(offsetmsb-2, offsetlsb).toUFix, data_array_rdata(127, 96),
io.cpu.resp_val := !io.cpu.itlb_miss && (state === s_ready) && r_cpu_req_val && tag_valid && tag_match;
io.cpu.req_rdy := !io.cpu.itlb_miss && (state === s_ready) && (!r_cpu_req_val || (tag_valid && tag_match));
io.cpu.resp_data :=
MuxLookup(r_cpu_req_idx(offsetmsb-2, offsetlsb).toUFix, data_array_rdata(127, 96),
Array(UFix(2) -> data_array_rdata(95,64),
UFix(1) -> data_array_rdata(63,32),
UFix(0) -> data_array_rdata(31,0)));
io.mem.req_val := (state === s_request);
io.mem.req_addr := Cat(r_cpu_req_addr(tagmsb, indexlsb), Bits(0,2)).toUFix;
io.mem.req_addr := Cat(r_cpu_req_ppn, r_cpu_req_idx(PGIDX_BITS-1, offsetbits), Bits(0,2)).toUFix;
// Cat(r_cpu_req_addr(tagmsb, indexlsb), Bits(0,2)).toUFix;
// control state machine
switch (state) {
@ -138,17 +162,23 @@ class rocketICacheDM(lines: Int) extends Component {
state <== s_ready;
}
is (s_ready) {
when (r_cpu_req_val && !tag_match) { state <== s_request; }
when (!io.cpu.itlb_miss && r_cpu_req_val && !(tag_valid && tag_match)) { state <== s_request; }
}
is (s_request)
{
when (io.mem.req_rdy) { state <== s_refill_wait; }
when (io.mem.req_rdy) {
state <== s_refill_wait;
}
}
is (s_refill_wait) {
when (io.mem.resp_val) { state <== s_refill; }
when (io.mem.resp_val) {
state <== s_refill;
}
}
is (s_refill) {
when (io.mem.resp_val && (refill_count === UFix(3,2))) { state <== s_resolve_miss; }
when (io.mem.resp_val && (refill_count === UFix(3,2))) {
state <== s_resolve_miss;
}
}
is (s_resolve_miss) {
state <== s_ready;