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[rtl] Change code to be more xprop-friendly

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Xprop is a simulation feature that improves the SV semantics when
conditions contain 'X values. Change RTL or DV code to enable more xprop
instrumentation.

This addresses lowRISC/opentitan#16791 and some of
lowRISC/opentitan#16723.

Signed-off-by: Guillermo Maturana <maturana@google.com>
This commit is contained in:
Guillermo Maturana 2022-12-13 17:10:51 -08:00 • committed by Andreas Kurth
parent 9a65bc1f0d
commit ec32fb1a64
2 changed files with 15 additions and 17 deletions
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10
rtl/ibex_cs_registers.sv
View file

@ -126,17 +126,17 @@ module ibex_cs_registers #(
// Is a PMP config a locked one that allows M-mode execution when MSECCFG.MML is set (either
// M mode alone or shared M/U mode execution)?
function automatic logic is_mml_m_exec_cfg(ibex_pkg::pmp_cfg_t pmp_cfg);
logic unused_cfg;
unused_cfg = ^{pmp_cfg.mode};
logic unused_cfg = ^{pmp_cfg.mode};
logic value = 1'b0;
if (pmp_cfg.lock) begin
unique case ({pmp_cfg.read, pmp_cfg.write, pmp_cfg.exec})
3'b001, 3'b010, 3'b011, 3'b101: return 1'b1;
default: return 1'b0;
3'b001, 3'b010, 3'b011, 3'b101: value = 1'b1;
default: value = 1'b0;
endcase
end
return 1'b0;
return value;
endfunction
localparam int unsigned RV32BExtra = (RV32B == RV32BOTEarlGrey) || (RV32B == RV32BFull) ? 1 : 0;

22
rtl/ibex_pmp.sv
View file

@ -56,16 +56,13 @@ module ibex_pmp #(
ibex_pkg::pmp_req_e pmp_req_type,
ibex_pkg::priv_lvl_e priv_mode,
logic permission_check);
if (csr_pmp_mseccfg_mml) begin
return mml_perm_check(csr_pmp_cfg,
pmp_req_type,
priv_mode,
permission_check);
end else begin
return orig_perm_check(csr_pmp_cfg.lock,
priv_mode,
permission_check);
end
return csr_pmp_mseccfg_mml ? mml_perm_check(csr_pmp_cfg,
pmp_req_type,
priv_mode,
permission_check) :
orig_perm_check(csr_pmp_cfg.lock,
priv_mode,
permission_check);
endfunction
// Compute permissions checks that apply when MSECCFG.MML is set. Added for Smepmp support.
@ -134,13 +131,14 @@ module ibex_pmp #(
// modes. Also deny unmatched for M-mode whe MSECCFG.MML is set and request type is EXEC.
logic access_fail = csr_pmp_mseccfg_mmwp | (priv_mode != PRIV_LVL_M) |
(csr_pmp_mseccfg_mml && (pmp_req_type == PMP_ACC_EXEC));
logic matched = 1'b0;
// PMP entries are statically prioritized, from 0 to N-1
// The lowest-numbered PMP entry which matches an address determines accessibility
for (int r = 0; r < PMPNumRegions; r++) begin
if (match_all[r]) begin
if (!matched && match_all[r]) begin
access_fail = ~final_perm_check[r];
break;
matched = 1'b1;
end
end
return access_fail;