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dcache fixes - all tests and ubmarks pass, hello world still broken

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This commit is contained in:
Rimas Avizienis 2011-11-04 15:40:41 -07:00
parent 3a02028a35
commit 4459935554
5 changed files with 109 additions and 75 deletions
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1
rocket/src/main/scala/consts.scala
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@ -23,6 +23,7 @@ object Constants
val PC_PCR = UFix(6, 4); val PC_PCR = UFix(6, 4);
val PC_MEM = UFix(7, 4); val PC_MEM = UFix(7, 4);
val PC_MEM4 = UFix(8, 4); val PC_MEM4 = UFix(8, 4);
val PC_EX = UFix(9, 4);
val KF_Y = UFix(1, 1); val KF_Y = UFix(1, 1);
val KF_N = UFix(0, 1); val KF_N = UFix(0, 1);

4
rocket/src/main/scala/cpu.scala
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@ -8,6 +8,10 @@ class ioDebug extends Bundle()
{ {
val error_mode = Bool('output); val error_mode = Bool('output);
val log_control = Bool('output); val log_control = Bool('output);
val id_valid = Bool('output);
val ex_valid = Bool('output);
val mem_valid = Bool('output);
val wb_valid = Bool('output);
} }
class ioHost(view: List[String] = null) extends Bundle(view) class ioHost(view: List[String] = null) extends Bundle(view)

35
rocket/src/main/scala/ctrl.scala
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@ -39,9 +39,7 @@ class ioCtrlDpath extends Bundle()
val xcpt_syscall = Bool('output); val xcpt_syscall = Bool('output);
val eret = Bool('output); val eret = Bool('output);
val mem_load = Bool('output); val mem_load = Bool('output);
val dcache_miss = Bool('output);
val wen = Bool('output); val wen = Bool('output);
val wb_div_mul = Bool('output);
// inputs from datapath // inputs from datapath
val btb_hit = Bool('input); val btb_hit = Bool('input);
val inst = Bits(32, 'input); val inst = Bits(32, 'input);
@ -67,7 +65,7 @@ class ioCtrlAll extends Bundle()
val dpath = new ioCtrlDpath(); val dpath = new ioCtrlDpath();
val console = new ioConsole(List("rdy", "valid")); val console = new ioConsole(List("rdy", "valid"));
val imem = new ioImem(List("req_val", "req_rdy", "resp_val")).flip(); val imem = new ioImem(List("req_val", "req_rdy", "resp_val")).flip();
val dmem = new ioDmem(List("req_val", "req_rdy", "req_cmd", "req_type", "resp_val")).flip(); val dmem = new ioDmem(List("req_val", "req_rdy", "req_cmd", "req_type", "resp_miss", "resp_val")).flip();
val host = new ioHost(List("start")); val host = new ioHost(List("start"));
} }
@ -323,33 +321,34 @@ class rocketCtrl extends Component
wb_reg_div_mul_val <== mem_reg_div_mul_val; wb_reg_div_mul_val <== mem_reg_div_mul_val;
} }
// replay PC when the D$ is blocked // replay execute stage PC when the D$ is blocked
val replay_mem_pc = mem_reg_mem_val && !io.dmem.req_rdy; // val replay_mem_pc = mem_reg_mem_val && (mem_reg_mem_cmd != M_FLA) && !io.dmem.req_rdy;
// replay PC+4 on a D$ load miss val replay_ex = ex_reg_mem_val && !io.dmem.req_rdy;
// replay memory stage PC+4 on a D$ load miss
val mem_cmd_load = mem_reg_mem_val && (mem_reg_mem_cmd === M_XRD); val mem_cmd_load = mem_reg_mem_val && (mem_reg_mem_cmd === M_XRD);
val replay_mem_pc_plus4 = mem_cmd_load && !io.dmem.resp_val; // val replay_mem_pc_plus4 = mem_cmd_load && !io.dmem.resp_val;
val replay_mem = io.dmem.resp_miss;
val kill_ex = replay_mem_pc | replay_mem_pc_plus4 | mem_reg_privileged | io.dpath.exception; // val kill_ex = replay_mem_pc | replay_mem_pc_plus4 | mem_reg_privileged;
val kill_ex = replay_ex | replay_mem | mem_reg_privileged;
val kill_mem = io.dpath.exception; val kill_mem = io.dpath.exception;
dcache_miss <== replay_mem_pc_plus4; dcache_miss <== io.dmem.resp_miss;
io.dpath.mem_load := mem_cmd_load; io.dpath.mem_load := mem_cmd_load;
io.dpath.dcache_miss := dcache_miss;
io.dpath.sel_pc := io.dpath.sel_pc :=
Mux(replay_mem_pc, PC_MEM, Mux(replay_mem || mem_reg_privileged, PC_MEM4,
Mux(replay_mem_pc_plus4 || mem_reg_privileged, PC_MEM4,
Mux(io.dpath.exception || mem_reg_eret, PC_PCR, Mux(io.dpath.exception || mem_reg_eret, PC_PCR,
Mux(replay_ex, PC_EX,
Mux(!ex_reg_btb_hit && br_taken, PC_BR, Mux(!ex_reg_btb_hit && br_taken, PC_BR,
Mux(ex_reg_btb_hit && !br_taken, PC_EX4, Mux(ex_reg_btb_hit && !br_taken, PC_EX4,
// Mux(ex_reg_btb_hit && !br_taken || ex_reg_privileged, PC_EX4,
Mux(jr_taken, PC_JR, Mux(jr_taken, PC_JR,
Mux(j_taken, PC_J, Mux(j_taken, PC_J,
Mux(io.dpath.btb_hit, PC_BTB, Mux(io.dpath.btb_hit, PC_BTB,
PC_4)))))))); PC_4))))))));
io.dpath.wen_btb := ~ex_reg_btb_hit & br_taken; io.dpath.wen_btb := ~ex_reg_btb_hit & br_taken & ~kill_ex & ~kill_mem;
val take_pc = val take_pc =
~ex_reg_btb_hit & br_taken | ~ex_reg_btb_hit & br_taken |
@ -359,8 +358,8 @@ class rocketCtrl extends Component
io.dpath.exception | io.dpath.exception |
mem_reg_privileged | mem_reg_privileged |
mem_reg_eret | mem_reg_eret |
replay_mem_pc | replay_ex |
replay_mem_pc_plus4; replay_mem;
io.dpath.stallf := io.dpath.stallf :=
~take_pc & ~take_pc &
@ -428,7 +427,7 @@ class rocketCtrl extends Component
io.dpath.mul_result_val io.dpath.mul_result_val
); );
val ctrl_killd = take_pc | ctrl_stalld | io.dpath.killx; val ctrl_killd = take_pc | ctrl_stalld;
// for divider, multiplier writeback // for divider, multiplier writeback
val mul_wb = io.dpath.mul_result_val; val mul_wb = io.dpath.mul_result_val;
@ -438,7 +437,7 @@ class rocketCtrl extends Component
io.dpath.killf := take_pc | ~io.imem.resp_val; io.dpath.killf := take_pc | ~io.imem.resp_val;
io.dpath.killd := ctrl_killd.toBool; io.dpath.killd := ctrl_killd.toBool;
io.dpath.killx := kill_ex.toBool; io.dpath.killx := kill_ex.toBool || kill_mem.toBool;
io.dpath.killm := kill_mem.toBool; io.dpath.killm := kill_mem.toBool;
io.dpath.ren2 := id_ren2.toBool; io.dpath.ren2 := id_ren2.toBool;

111
rocket/src/main/scala/dcache.scala
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@ -13,7 +13,8 @@ class ioDmem(view: List[String] = null) extends Bundle(view) {
val req_type = Bits(3, 'input); val req_type = Bits(3, 'input);
val req_addr = UFix(32, 'input); val req_addr = UFix(32, 'input);
val req_data = Bits(64, 'input); val req_data = Bits(64, 'input);
val req_tag = Bits(12, 'input); val req_tag = Bits(5, 'input);
val resp_miss = Bool('output);
val resp_val = Bool('output); val resp_val = Bool('output);
val resp_data = Bits(64, 'output); val resp_data = Bits(64, 'output);
val resp_tag = Bits(12, 'output); val resp_tag = Bits(12, 'output);
@ -56,7 +57,7 @@ class rocketDCacheDM_flush(lines: Int, addrbits: Int) extends Component {
val flush_resp_count = Reg(resetVal = UFix(0, indexbits)); val flush_resp_count = Reg(resetVal = UFix(0, indexbits));
val flushing = Reg(resetVal = Bool(false)); val flushing = Reg(resetVal = Bool(false));
val flush_waiting = Reg(resetVal = Bool(false)); val flush_waiting = Reg(resetVal = Bool(false));
val r_cpu_req_tag = Reg(resetVal = Bits(0, 12)); val r_cpu_req_tag = Reg(resetVal = Bits(0, 5));
when (io.cpu.req_val && io.cpu.req_rdy && (io.cpu.req_cmd === M_FLA)) when (io.cpu.req_val && io.cpu.req_rdy && (io.cpu.req_cmd === M_FLA))
{ {
@ -84,6 +85,7 @@ class rocketDCacheDM_flush(lines: Int, addrbits: Int) extends Component {
dcache.io.mem ^^ io.mem; dcache.io.mem ^^ io.mem;
io.cpu.req_rdy := dcache.io.cpu.req_rdy && !flush_waiting; io.cpu.req_rdy := dcache.io.cpu.req_rdy && !flush_waiting;
io.cpu.resp_miss := dcache.io.cpu.resp_miss;
io.cpu.resp_data := dcache.io.cpu.resp_data; io.cpu.resp_data := dcache.io.cpu.resp_data;
io.cpu.resp_tag := dcache.io.cpu.resp_tag; io.cpu.resp_tag := dcache.io.cpu.resp_tag;
io.cpu.resp_val := dcache.io.cpu.resp_val & io.cpu.resp_val := dcache.io.cpu.resp_val &
@ -108,14 +110,16 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
val r_cpu_req_addr = Reg(resetVal = Bits(0, addrbits)); val r_cpu_req_addr = Reg(resetVal = Bits(0, addrbits));
val r_cpu_req_val = Reg(resetVal = Bool(false)); 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_cmd = Reg(resetVal = Bits(0,4)); val r_cpu_req_cmd = Reg(resetVal = Bits(0,4));
val r_cpu_req_type = Reg(resetVal = Bits(0,3)); val r_cpu_req_type = Reg(resetVal = Bits(0,3));
val r_cpu_req_tag = Reg(resetVal = Bits(0,5)); val r_cpu_req_tag = Reg(resetVal = Bits(0,5));
val p_store_data = Reg(resetVal = Bits(0,64)); val p_store_data = Reg(resetVal = Bits(0,64));
val p_store_addr = Reg(resetVal = Bits(0,64)); val p_store_addr = Reg(resetVal = Bits(0,64));
val p_store_wmask = Reg(resetVal = Bits(0,64)); val p_store_cmd = Reg(resetVal = Bits(0,4));
val p_store_type = Reg(resetVal = Bits(0,3));
// val p_store_wmask = Reg(resetVal = Bits(0,64));
val p_store_valid = Reg(resetVal = Bool(false)); val p_store_valid = Reg(resetVal = Bool(false));
val req_load = (r_cpu_req_cmd === M_XRD); val req_load = (r_cpu_req_cmd === M_XRD);
@ -124,12 +128,18 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
when (io.cpu.req_val && io.cpu.req_rdy) { when (io.cpu.req_val && io.cpu.req_rdy) {
r_cpu_req_addr <== io.cpu.req_addr; r_cpu_req_addr <== io.cpu.req_addr;
r_cpu_req_data <== io.cpu.req_data;
r_cpu_req_cmd <== io.cpu.req_cmd; r_cpu_req_cmd <== io.cpu.req_cmd;
r_cpu_req_type <== io.cpu.req_type; r_cpu_req_type <== io.cpu.req_type;
r_cpu_req_tag <== io.cpu.req_tag; r_cpu_req_tag <== io.cpu.req_tag;
} }
when (io.cpu.req_val && io.cpu.req_rdy && (io.cpu.req_cmd === M_XWR)) {
p_store_data <== io.cpu.req_data;
p_store_addr <== io.cpu.req_addr;
p_store_type <== io.cpu.req_type;
p_store_valid <== Bool(true);
}
when (io.cpu.req_rdy) { when (io.cpu.req_rdy) {
r_cpu_req_val <== io.cpu.req_val; r_cpu_req_val <== io.cpu.req_val;
} }
@ -145,7 +155,9 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
} }
// tag array // tag array
val tag_we = (state === s_refill) && io.mem.req_rdy && (rr_count === UFix(3,2)); val tag_we =
((state === s_refill) && io.mem.req_rdy && (rr_count === UFix(3,2))) ||
((state === s_resolve_miss) && req_flush);
val tag_waddr = r_cpu_req_addr(indexmsb, indexlsb).toUFix; val tag_waddr = r_cpu_req_addr(indexmsb, indexlsb).toUFix;
val tag_wdata = r_cpu_req_addr(tagmsb, taglsb); val tag_wdata = r_cpu_req_addr(tagmsb, taglsb);
val tag_array = Mem(lines, tag_we, tag_waddr, tag_wdata); val tag_array = Mem(lines, tag_we, tag_waddr, tag_wdata);
@ -169,54 +181,53 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
// generate write mask and store data signals based on store type and address LSBs // generate write mask and store data signals based on store type and address LSBs
val wmask_b = val wmask_b =
Mux(r_cpu_req_addr(2,0) === UFix(0, 3), Bits("b0000_0001", 8), Mux(p_store_addr(2,0) === UFix(0, 3), Bits("b0000_0001", 8),
Mux(r_cpu_req_addr(2,0) === UFix(1, 3), Bits("b0000_0010", 8), Mux(p_store_addr(2,0) === UFix(1, 3), Bits("b0000_0010", 8),
Mux(r_cpu_req_addr(2,0) === UFix(2, 3), Bits("b0000_0100", 8), Mux(p_store_addr(2,0) === UFix(2, 3), Bits("b0000_0100", 8),
Mux(r_cpu_req_addr(2,0) === UFix(3, 3), Bits("b0000_1000", 8), Mux(p_store_addr(2,0) === UFix(3, 3), Bits("b0000_1000", 8),
Mux(r_cpu_req_addr(2,0) === UFix(4, 3), Bits("b0001_0000", 8), Mux(p_store_addr(2,0) === UFix(4, 3), Bits("b0001_0000", 8),
Mux(r_cpu_req_addr(2,0) === UFix(5, 3), Bits("b0010_0000", 8), Mux(p_store_addr(2,0) === UFix(5, 3), Bits("b0010_0000", 8),
Mux(r_cpu_req_addr(2,0) === UFix(6, 3), Bits("b0100_0000", 8), Mux(p_store_addr(2,0) === UFix(6, 3), Bits("b0100_0000", 8),
Mux(r_cpu_req_addr(2,0) === UFix(7, 3), Bits("b1000_0000", 8), Mux(p_store_addr(2,0) === UFix(7, 3), Bits("b1000_0000", 8),
UFix(0, 8))))))))); UFix(0, 8)))))))));
val wmask_h = val wmask_h =
Mux(r_cpu_req_addr(2,1) === UFix(0, 2), Bits("b0000_0011", 8), Mux(p_store_addr(2,1) === UFix(0, 2), Bits("b0000_0011", 8),
Mux(r_cpu_req_addr(2,1) === UFix(1, 2), Bits("b0000_1100", 8), Mux(p_store_addr(2,1) === UFix(1, 2), Bits("b0000_1100", 8),
Mux(r_cpu_req_addr(2,1) === UFix(2, 2), Bits("b0011_0000", 8), Mux(p_store_addr(2,1) === UFix(2, 2), Bits("b0011_0000", 8),
Mux(r_cpu_req_addr(2,1) === UFix(3, 2), Bits("b1100_0000", 8), Mux(p_store_addr(2,1) === UFix(3, 2), Bits("b1100_0000", 8),
UFix(0, 8))))); UFix(0, 8)))));
val wmask_w = val wmask_w =
Mux(r_cpu_req_addr(2) === UFix(0, 1), Bits("b0000_1111", 8), Mux(p_store_addr(2) === UFix(0, 1), Bits("b0000_1111", 8),
Mux(r_cpu_req_addr(2) === UFix(1, 1), Bits("b1111_0000", 8), Mux(p_store_addr(2) === UFix(1, 1), Bits("b1111_0000", 8),
UFix(0, 8))); UFix(0, 8)));
val wmask_d = val wmask_d =
Bits("b1111_1111", 8); Bits("b1111_1111", 8);
val store_wmask = val store_wmask =
Mux(r_cpu_req_type === MT_B, wmask_b, Mux(p_store_type === MT_B, wmask_b,
Mux(r_cpu_req_type === MT_H, wmask_h, Mux(p_store_type === MT_H, wmask_h,
Mux(r_cpu_req_type === MT_W, wmask_w, Mux(p_store_type === MT_W, wmask_w,
Mux(r_cpu_req_type === MT_D, wmask_d, Mux(p_store_type === MT_D, wmask_d,
UFix(0, 8))))); UFix(0, 8)))));
val store_data = val store_data =
Mux(r_cpu_req_type === MT_B, Fill(8, r_cpu_req_data( 7,0)), Mux(p_store_type === MT_B, Fill(8, p_store_data( 7,0)),
Mux(r_cpu_req_type === MT_H, Fill(4, r_cpu_req_data(15,0)), Mux(p_store_type === MT_H, Fill(4, p_store_data(15,0)),
Mux(r_cpu_req_type === MT_W, Fill(2, r_cpu_req_data(31,0)), Mux(p_store_type === MT_W, Fill(2, p_store_data(31,0)),
Mux(r_cpu_req_type === MT_D, r_cpu_req_data, Mux(p_store_type === MT_D, p_store_data,
UFix(0, 64))))); UFix(0, 64)))));
when ((state === s_ready) && r_cpu_req_val && req_store) {
p_store_data <== store_data;
p_store_addr <== r_cpu_req_addr;
p_store_wmask <== store_wmask;
p_store_valid <== Bool(true);
}
val addr_match = (r_cpu_req_addr(tagmsb, offsetlsb) === p_store_addr(tagmsb, offsetlsb)); 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 || !tag_match || !req_load || addr_match)) val ldst_conflict = r_cpu_req_val && req_load && p_store_valid && addr_match;
// val drain_store = ((state === s_ready) && p_store_valid && (!r_cpu_req_val || !tag_match || !req_load || addr_match))
val drain_store =
(state === s_ready) && p_store_valid &&
(!(io.cpu.req_val && (io.cpu.req_cmd === M_XRD)) ||
r_cpu_req_val && req_load && p_store_valid && addr_match);
val resolve_store = (state === s_resolve_miss) && req_store; val resolve_store = (state === s_resolve_miss) && req_store;
val do_store = drain_store | resolve_store; val do_store = drain_store | resolve_store;
@ -241,22 +252,22 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
val data_array_wdata = val data_array_wdata =
Mux((state === s_refill), io.mem.resp_data, Mux((state === s_refill), io.mem.resp_data,
Cat(p_store_data, p_store_data)); Cat(store_data, store_data));
val p_wmask_expand = val store_wmask_expand =
Cat(Fill(8, p_store_wmask(7)), Cat(Fill(8, store_wmask(7)),
Fill(8, p_store_wmask(6)), Fill(8, store_wmask(6)),
Fill(8, p_store_wmask(5)), Fill(8, store_wmask(5)),
Fill(8, p_store_wmask(4)), Fill(8, store_wmask(4)),
Fill(8, p_store_wmask(3)), Fill(8, store_wmask(3)),
Fill(8, p_store_wmask(2)), Fill(8, store_wmask(2)),
Fill(8, p_store_wmask(1)), Fill(8, store_wmask(1)),
Fill(8, p_store_wmask(0))); Fill(8, store_wmask(0)));
val da_store_wmask = val da_store_wmask =
Mux(p_store_addr(offsetlsb).toBool, Mux(p_store_addr(offsetlsb).toBool,
Cat(p_wmask_expand, Bits(0,64)), Cat(store_wmask_expand, Bits(0,64)),
Cat(Bits(0,64), p_wmask_expand)); Cat(Bits(0,64), store_wmask_expand));
val data_array_wmask = val data_array_wmask =
Mux((state === s_refill), ~Bits(0,128), Mux((state === s_refill), ~Bits(0,128),
@ -269,7 +280,7 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
io.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 data_array_rdata = Reg(data_array.read(data_array_raddr));
val ldst_conflict = r_cpu_req_val && req_load && p_store_valid && addr_match; val miss = (state === s_ready) && r_cpu_req_val && req_load && (!tag_match || (p_store_valid && addr_match));
// output signals // output signals
io.cpu.req_rdy := (state === s_ready) && !ldst_conflict && (!r_cpu_req_val || (tag_match && !req_flush)); io.cpu.req_rdy := (state === s_ready) && !ldst_conflict && (!r_cpu_req_val || (tag_match && !req_flush));
@ -277,8 +288,8 @@ class rocketDCacheDM_1C(lines: Int, addrbits: Int) extends Component {
io.cpu.resp_val := ((state === s_ready) && r_cpu_req_val && tag_match && req_load && !(p_store_valid && addr_match)) || 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); ((state === s_resolve_miss) && req_flush);
io.cpu.resp_miss := miss;
io.cpu.resp_tag := Cat(Bits(0,1), r_cpu_req_type, r_cpu_req_addr(2,0), r_cpu_req_tag); io.cpu.resp_tag := Cat(Bits(0,1), r_cpu_req_type, r_cpu_req_addr(2,0), r_cpu_req_tag);
io.cpu.resp_data := io.cpu.resp_data :=
Mux(r_cpu_req_addr(offsetlsb).toBool, data_array_rdata(127, 64), Mux(r_cpu_req_addr(offsetlsb).toBool, data_array_rdata(127, 64),
data_array_rdata(63,0)); data_array_rdata(63,0));

25
rocket/src/main/scala/dpath.scala
View File

@ -44,11 +44,13 @@ class rocketDpath extends Component
val if_reg_pc = Reg(width = 32, resetVal = UFix(0, 32)); val if_reg_pc = Reg(width = 32, resetVal = UFix(0, 32));
// instruction decode definitions // instruction decode definitions
val id_reg_valid = Reg(resetVal = Bool(false));
val id_reg_pc = Reg(resetVal = UFix(0,32)); val id_reg_pc = Reg(resetVal = UFix(0,32));
val id_reg_pc_plus4 = Reg(resetVal = UFix(0,32)); val id_reg_pc_plus4 = Reg(resetVal = UFix(0,32));
val id_reg_inst = Reg(resetVal = NOP); val id_reg_inst = Reg(resetVal = NOP);
// execute definitions // execute definitions
val ex_reg_valid = Reg(resetVal = Bool(false));
val ex_reg_pc = Reg(resetVal = UFix(0,32)); val ex_reg_pc = Reg(resetVal = UFix(0,32));
val ex_reg_pc_plus4 = Reg(resetVal = UFix(0,32)); val ex_reg_pc_plus4 = Reg(resetVal = UFix(0,32));
val ex_reg_inst = Reg(resetVal = Bits(0,32)); val ex_reg_inst = Reg(resetVal = Bits(0,32));
@ -76,6 +78,7 @@ class rocketDpath extends Component
val ex_wdata = Wire() { Bits() }; val ex_wdata = Wire() { Bits() };
// memory definitions // memory definitions
val mem_reg_valid = Reg(resetVal = Bool(false));
val mem_reg_pc = Reg(resetVal = UFix(0,32)); val mem_reg_pc = Reg(resetVal = UFix(0,32));
val mem_reg_pc_plus4 = Reg(resetVal = UFix(0,32)); val mem_reg_pc_plus4 = Reg(resetVal = UFix(0,32));
val mem_reg_waddr = Reg(resetVal = UFix(0,5)); val mem_reg_waddr = Reg(resetVal = UFix(0,5));
@ -90,6 +93,7 @@ class rocketDpath extends Component
val mem_reg_ctrl_wen_pcr = Reg(resetVal = Bool(false)); val mem_reg_ctrl_wen_pcr = Reg(resetVal = Bool(false));
// writeback definitions // writeback definitions
val wb_reg_valid = Reg(resetVal = Bool(false));
val wb_reg_pc = Reg(resetVal = UFix(0,32)); val wb_reg_pc = Reg(resetVal = UFix(0,32));
val wb_reg_waddr = Reg(resetVal = UFix(0,5)); val wb_reg_waddr = Reg(resetVal = UFix(0,5));
val wb_reg_wdata = Reg(resetVal = Bits(0,64)); val wb_reg_wdata = Reg(resetVal = Bits(0,64));
@ -126,6 +130,7 @@ class rocketDpath extends Component
val if_next_pc = val if_next_pc =
Mux(io.ctrl.sel_pc === PC_4, if_pc_plus4, Mux(io.ctrl.sel_pc === PC_4, if_pc_plus4,
Mux(io.ctrl.sel_pc === PC_BTB, if_btb_target, Mux(io.ctrl.sel_pc === PC_BTB, if_btb_target,
Mux(io.ctrl.sel_pc === PC_EX, ex_reg_pc,
Mux(io.ctrl.sel_pc === PC_EX4, ex_reg_pc_plus4, Mux(io.ctrl.sel_pc === PC_EX4, ex_reg_pc_plus4,
Mux(io.ctrl.sel_pc === PC_BR, ex_branch_target, Mux(io.ctrl.sel_pc === PC_BR, ex_branch_target,
Mux(io.ctrl.sel_pc === PC_J, ex_branch_target, Mux(io.ctrl.sel_pc === PC_J, ex_branch_target,
@ -133,7 +138,7 @@ class rocketDpath extends Component
Mux(io.ctrl.sel_pc === PC_PCR, mem_reg_pcr(31,0).toUFix, Mux(io.ctrl.sel_pc === PC_PCR, mem_reg_pcr(31,0).toUFix,
Mux(io.ctrl.sel_pc === PC_MEM, mem_reg_pc, Mux(io.ctrl.sel_pc === PC_MEM, mem_reg_pc,
Mux(io.ctrl.sel_pc === PC_MEM4, mem_reg_pc_plus4, Mux(io.ctrl.sel_pc === PC_MEM4, mem_reg_pc_plus4,
UFix(0, 32)))))))))); UFix(0, 32)))))))))));
when (!io.host.start){ when (!io.host.start){
if_reg_pc <== UFix(0, 32); //32'hFFFF_FFFC; if_reg_pc <== UFix(0, 32); //32'hFFFF_FFFC;
@ -156,10 +161,12 @@ class rocketDpath extends Component
id_reg_pc <== if_reg_pc; id_reg_pc <== if_reg_pc;
id_reg_pc_plus4 <== if_pc_plus4; id_reg_pc_plus4 <== if_pc_plus4;
when(io.ctrl.killf) { when(io.ctrl.killf) {
id_reg_inst <== NOP; id_reg_inst <== NOP;
id_reg_valid <== Bool(false);
} }
otherwise { otherwise {
id_reg_inst <== io.imem.resp_data; id_reg_inst <== io.imem.resp_data;
id_reg_valid <== Bool(true);
} }
} }
@ -265,6 +272,7 @@ class rocketDpath extends Component
ex_reg_ctrl_cause <== id_cause; ex_reg_ctrl_cause <== id_cause;
when(io.ctrl.killd) { when(io.ctrl.killd) {
ex_reg_valid <== Bool(false);
ex_reg_ctrl_div_val <== Bool(false); ex_reg_ctrl_div_val <== Bool(false);
ex_reg_ctrl_mul_val <== Bool(false); ex_reg_ctrl_mul_val <== Bool(false);
ex_reg_ctrl_wen <== Bool(false); ex_reg_ctrl_wen <== Bool(false);
@ -273,6 +281,7 @@ class rocketDpath extends Component
ex_reg_ctrl_exception <== Bool(false); ex_reg_ctrl_exception <== Bool(false);
} }
otherwise { otherwise {
ex_reg_valid <== id_reg_valid;
ex_reg_ctrl_div_val <== io.ctrl.div_val; ex_reg_ctrl_div_val <== io.ctrl.div_val;
ex_reg_ctrl_mul_val <== io.ctrl.mul_val; ex_reg_ctrl_mul_val <== io.ctrl.mul_val;
ex_reg_ctrl_wen <== io.ctrl.wen; ex_reg_ctrl_wen <== io.ctrl.wen;
@ -376,12 +385,14 @@ class rocketDpath extends Component
mem_reg_ctrl_cause <== ex_reg_ctrl_cause; mem_reg_ctrl_cause <== ex_reg_ctrl_cause;
when (io.ctrl.killx) { when (io.ctrl.killx) {
mem_reg_valid <== Bool(false);
mem_reg_ctrl_eret <== Bool(false); mem_reg_ctrl_eret <== Bool(false);
mem_reg_ctrl_wen <== Bool(false); mem_reg_ctrl_wen <== Bool(false);
mem_reg_ctrl_wen_pcr <== Bool(false); mem_reg_ctrl_wen_pcr <== Bool(false);
mem_reg_ctrl_exception <== Bool(false); mem_reg_ctrl_exception <== Bool(false);
} }
otherwise { otherwise {
mem_reg_valid <== ex_reg_valid;
mem_reg_ctrl_eret <== ex_reg_ctrl_eret; mem_reg_ctrl_eret <== ex_reg_ctrl_eret;
mem_reg_ctrl_wen <== ex_reg_ctrl_wen; mem_reg_ctrl_wen <== ex_reg_ctrl_wen;
mem_reg_ctrl_wen_pcr <== ex_reg_ctrl_wen_pcr; mem_reg_ctrl_wen_pcr <== ex_reg_ctrl_wen_pcr;
@ -412,10 +423,12 @@ class rocketDpath extends Component
wb_reg_ctrl_exception <== mem_reg_ctrl_exception; wb_reg_ctrl_exception <== mem_reg_ctrl_exception;
when (io.ctrl.killm) { when (io.ctrl.killm) {
wb_reg_valid <== Bool(false);
wb_reg_ctrl_wen <== Bool(false); wb_reg_ctrl_wen <== Bool(false);
wb_reg_ctrl_wen_pcr <== Bool(false); wb_reg_ctrl_wen_pcr <== Bool(false);
} }
otherwise { otherwise {
wb_reg_valid <== mem_reg_valid;
wb_reg_ctrl_wen <== mem_reg_ctrl_wen; wb_reg_ctrl_wen <== mem_reg_ctrl_wen;
wb_reg_ctrl_wen_pcr <== mem_reg_ctrl_wen_pcr; wb_reg_ctrl_wen_pcr <== mem_reg_ctrl_wen_pcr;
} }
@ -449,6 +462,12 @@ class rocketDpath extends Component
pcr.io.cause := wb_reg_ctrl_cause; pcr.io.cause := wb_reg_ctrl_cause;
pcr.io.pc := wb_reg_pc; pcr.io.pc := wb_reg_pc;
// temporary debug outputs so things don't get optimized away
io.debug.id_valid := id_reg_valid;
io.debug.ex_valid := ex_reg_valid;
io.debug.mem_valid := mem_reg_valid;
io.debug.wb_valid := wb_reg_valid;
} }
} }