riscv/rocket-chip
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hookup vitlb ptw port

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This commit is contained in:
Yunsup Lee 2012-03-17 23:00:51 -07:00
parent b793d63182
commit 62ada5ea9e
2 changed files with 32 additions and 18 deletions
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1
rocket/src/main/scala/cpu.scala
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@ -100,6 +100,7 @@ class rocketProc(resetSignal: Bool = null) extends Component(resetSignal)
// and D$ arbiter (selects between requests from pipeline and PTW, PTW has priority)
ptw.io.dtlb <> dtlb.io.ptw;
ptw.io.itlb <> itlb.io.ptw;
ptw.io.vitlb <> vitlb.io.ptw
ptw.io.ptbr := dpath.io.ptbr;
arb.io.requestor(DMEM_PTW) <> ptw.io.dmem
arb.io.dmem <> io.dmem

49
rocket/src/main/scala/ptw.scala
View File

@ -72,6 +72,7 @@ class ioPTW extends Bundle
{
val itlb = new ioTLB_PTW().flip
val dtlb = new ioTLB_PTW().flip
val vitlb = new ioTLB_PTW().flip
val dmem = new ioDmem().flip
val ptbr = UFix(PADDR_BITS, INPUT);
}
@ -84,31 +85,38 @@ class rocketPTW extends Component
val state = Reg(resetVal = s_ready);
val r_req_vpn = Reg() { Bits() }
val r_req_dest = Reg() { Bool() }
val r_req_dest = Reg() { Bits() }
val req_addr = Reg() { UFix() };
val r_resp_ppn = Reg() { Bits() };
val r_resp_perm = Reg() { Bits() };
val vpn_idx = Mux(state === s_l2_wait, r_req_vpn(9,0), r_req_vpn(19,10));
val req_val = io.itlb.req_val || io.dtlb.req_val;
val req_val = io.itlb.req_val || io.dtlb.req_val || io.vitlb.req_val
// give ITLB requests priority over DTLB requests
val req_itlb_val = io.itlb.req_val;
val req_dtlb_val = io.dtlb.req_val && !io.itlb.req_val;
when ((state === s_ready) && req_dtlb_val) {
r_req_vpn := io.dtlb.req_vpn;
r_req_dest := Bool(true);
req_addr := Cat(io.ptbr(PADDR_BITS-1,PGIDX_BITS), io.dtlb.req_vpn(VPN_BITS-1,VPN_BITS-10), Bits(0,3)).toUFix;
}
val req_vitlb_val = io.vitlb.req_val && !io.itlb.req_val && !io.dtlb.req_val
when ((state === s_ready) && req_itlb_val) {
r_req_vpn := io.itlb.req_vpn;
r_req_dest := Bool(false);
r_req_dest := Bits(0)
req_addr := Cat(io.ptbr(PADDR_BITS-1,PGIDX_BITS), io.itlb.req_vpn(VPN_BITS-1,VPN_BITS-10), Bits(0,3)).toUFix;
}
when ((state === s_ready) && req_dtlb_val) {
r_req_vpn := io.dtlb.req_vpn;
r_req_dest := Bits(1)
req_addr := Cat(io.ptbr(PADDR_BITS-1,PGIDX_BITS), io.dtlb.req_vpn(VPN_BITS-1,VPN_BITS-10), Bits(0,3)).toUFix;
}
when ((state === s_ready) && req_vitlb_val) {
r_req_vpn := io.vitlb.req_vpn;
r_req_dest := Bits(2)
req_addr := Cat(io.ptbr(PADDR_BITS-1,PGIDX_BITS), io.vitlb.req_vpn(VPN_BITS-1,VPN_BITS-10), Bits(0,3)).toUFix;
}
val dmem_resp_val = Reg(io.dmem.resp_val, resetVal = Bool(false))
when (dmem_resp_val) {
req_addr := Cat(io.dmem.resp_data_subword(PADDR_BITS-1, PGIDX_BITS), vpn_idx, Bits(0,3)).toUFix;
@ -133,22 +141,27 @@ class rocketPTW extends Component
val resp_ptd = (io.dmem.resp_data_subword(1,0) === Bits(1,2));
val resp_pte = (io.dmem.resp_data_subword(1,0) === Bits(2,2));
io.dtlb.req_rdy := (state === s_ready) && !io.itlb.req_val;
io.itlb.req_rdy := (state === s_ready);
io.dtlb.resp_val := r_req_dest && resp_val;
io.itlb.resp_val := !r_req_dest && resp_val;
io.dtlb.resp_err := r_req_dest && resp_err;
io.itlb.resp_err := !r_req_dest && resp_err;
io.dtlb.resp_perm := r_resp_perm;
io.itlb.resp_perm := r_resp_perm;
io.itlb.req_rdy := (state === s_ready)
io.dtlb.req_rdy := (state === s_ready) && !io.itlb.req_val
io.vitlb.req_rdy := (state === s_ready) && !io.itlb.req_val && !io.dtlb.req_val
io.itlb.resp_val := r_req_dest === Bits(0) && resp_val
io.dtlb.resp_val := r_req_dest === Bits(1) && resp_val
io.vitlb.resp_val := r_req_dest === Bits(2) && resp_val
io.itlb.resp_err := r_req_dest === Bits(0) && resp_err
io.dtlb.resp_err := r_req_dest === Bits(1) && resp_err
io.vitlb.resp_err := r_req_dest === Bits(2) && resp_err
io.itlb.resp_perm := r_resp_perm
io.dtlb.resp_perm := r_resp_perm
io.vitlb.resp_perm:= r_resp_perm
val resp_ppn =
Mux(state === s_l1_fake, Cat(r_resp_ppn(PPN_BITS-1, PPN_BITS-7), r_req_vpn(VPN_BITS-11, 0)),
Mux(state === s_l2_fake, Cat(r_resp_ppn(PPN_BITS-1, PPN_BITS-17), r_req_vpn(VPN_BITS-21, 0)),
r_resp_ppn));
io.dtlb.resp_ppn := resp_ppn;
io.itlb.resp_ppn := resp_ppn;
io.dtlb.resp_ppn := resp_ppn;
io.vitlb.resp_ppn := resp_ppn;
// control state machine
switch (state) {