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Remove old MCYCLE/MCYCLEH, implement MCOUNTINHIBIT fully, always decode tied-off HPM counters

This commit is contained in:
Luke Wren 2021-05-30 19:20:53 +01:00
parent 565b76672a
commit cec5dc4e3b
1 changed files with 116 additions and 113 deletions
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225
hdl/hazard3_csr.v
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@ -121,7 +121,6 @@ localparam PMPADDR1 = 12'h3b1; // Physical memory protection address regis
// Performance counters (RW) // Performance counters (RW)
localparam MCYCLE = 12'hb00; // Raw cycles since start of day localparam MCYCLE = 12'hb00; // Raw cycles since start of day
localparam MTIME = 12'hb01; // "Wall clock", can be aliased to MCYCLE
localparam MINSTRET = 12'hb02; // Instruction retire count since start of day localparam MINSTRET = 12'hb02; // Instruction retire count since start of day
localparam MHPMCOUNTER3 = 12'hb03; // WARL (we tie to 0) localparam MHPMCOUNTER3 = 12'hb03; // WARL (we tie to 0)
localparam MHPMCOUNTER4 = 12'hb04; // WARL (we tie to 0) localparam MHPMCOUNTER4 = 12'hb04; // WARL (we tie to 0)
@ -154,7 +153,6 @@ localparam MHPMCOUNTER30 = 12'hb1e; // WARL (we tie to 0)
localparam MHPMCOUNTER31 = 12'hb1f; // WARL (we tie to 0) localparam MHPMCOUNTER31 = 12'hb1f; // WARL (we tie to 0)
localparam MCYCLEH = 12'hb80; // High halves of each counter localparam MCYCLEH = 12'hb80; // High halves of each counter
localparam MTIMEH = 12'hb81;
localparam MINSTRETH = 12'hb82; localparam MINSTRETH = 12'hb82;
localparam MHPMCOUNTER3H = 12'hb83; localparam MHPMCOUNTER3H = 12'hb83;
localparam MHPMCOUNTER4H = 12'hb84; localparam MHPMCOUNTER4H = 12'hb84;
@ -186,7 +184,7 @@ localparam MHPMCOUNTER29H = 12'hb9d;
localparam MHPMCOUNTER30H = 12'hb9e; localparam MHPMCOUNTER30H = 12'hb9e;
localparam MHPMCOUNTER31H = 12'hb9f; localparam MHPMCOUNTER31H = 12'hb9f;
localparam MCOUNTINHIBIT = 12'h302; // WARL (we must tie 0 as CYCLE and TIME are aliased) localparam MCOUNTINHIBIT = 12'h302; // Count inhibit register for mcycle/minstret
localparam MHPMEVENT3 = 12'h323; // WARL (we tie to 0) localparam MHPMEVENT3 = 12'h323; // WARL (we tie to 0)
localparam MHPMEVENT4 = 12'h324; // WARL (we tie to 0) localparam MHPMEVENT4 = 12'h324; // WARL (we tie to 0)
localparam MHPMEVENT5 = 12'h325; // WARL (we tie to 0) localparam MHPMEVENT5 = 12'h325; // WARL (we tie to 0)
@ -217,14 +215,6 @@ localparam MHPMEVENT29 = 12'h33d; // WARL (we tie to 0)
localparam MHPMEVENT30 = 12'h33e; // WARL (we tie to 0) localparam MHPMEVENT30 = 12'h33e; // WARL (we tie to 0)
localparam MHPMEVENT31 = 12'h33f; // WARL (we tie to 0) localparam MHPMEVENT31 = 12'h33f; // WARL (we tie to 0)
// TODO
// Decoding all these damn HPMs bloats the logic. If we don't decode them, we
// can still trap the illegal opcode and emulate them. This is ugly and
// contravenes the standard, but why on earth would they mandate 100 useless
// registers with no defined operation?
// If you really want them, set this to 1:
localparam DECODE_HPM = 0;
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
// CSR state + update logic // CSR state + update logic
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
@ -361,7 +351,10 @@ end
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
// Counters // Counters
// MCYCLE and MTIME are aliased (fine as long as MCOUNTINHIBIT[0] is tied low)
reg mcountinhibit_cy;
reg mcountinhibit_ir;
reg [XLEN-1:0] mcycleh; reg [XLEN-1:0] mcycleh;
reg [XLEN-1:0] mcycle; reg [XLEN-1:0] mcycle;
reg [XLEN-1:0] minstreth; reg [XLEN-1:0] minstreth;
@ -380,11 +373,16 @@ always @ (posedge clk or negedge rst_n) begin
mcycle <= X0; mcycle <= X0;
minstreth <= X0; minstreth <= X0;
minstret <= X0; minstret <= X0;
// Counters inhibited by default to save energy
mcountinhibit_cy <= 1'b0;
mcountinhibit_ir <= 1'b0;
end else if (CSR_COUNTER) begin end else if (CSR_COUNTER) begin
// Hold the top (2 * XLEN - W_COUNTER) bits constant to save gates: // Optionally hold the top (2 * XLEN - W_COUNTER) bits constant to
// save gates (noncompliant if enabled)
if (!mcountinhibit_cy)
{mcycleh, mcycle} <= (({mcycleh, mcycle} + 1'b1) & ~({2*XLEN{1'b1}} << W_COUNTER)) {mcycleh, mcycle} <= (({mcycleh, mcycle} + 1'b1) & ~({2*XLEN{1'b1}} << W_COUNTER))
| ({mcycleh, mcycle} & ({2*XLEN{1'b1}} << W_COUNTER)); | ({mcycleh, mcycle} & ({2*XLEN{1'b1}} << W_COUNTER));
if (instr_ret) if (!mcountinhibit_ir && instr_ret)
{minstreth, minstret} <= (({minstreth, minstret} + 1'b1) & ~({2*XLEN{1'b1}} << W_COUNTER)) {minstreth, minstret} <= (({minstreth, minstret} + 1'b1) & ~({2*XLEN{1'b1}} << W_COUNTER))
| ({minstreth, minstret} & ({2*XLEN{1'b1}} << W_COUNTER)); | ({minstreth, minstret} & ({2*XLEN{1'b1}} << W_COUNTER));
if (wen) begin if (wen) begin
@ -396,6 +394,12 @@ always @ (posedge clk or negedge rst_n) begin
minstreth <= ctr_update; minstreth <= ctr_update;
if (addr == MINSTRET) if (addr == MINSTRET)
minstret <= ctr_update; minstret <= ctr_update;
if (addr == MCOUNTINHIBIT) begin
{mcountinhibit_ir, mcountinhibit_cy} <=
wtype == CSR_WTYPE_C ? {mcountinhibit_ir, mcountinhibit_cy} & ~{wdata[2], wdata[0]} :
wtype == CSR_WTYPE_S ? {mcountinhibit_ir, mcountinhibit_cy} | {wdata[2], wdata[0]} :
{wdata[2], wdata[0]} ;
end
end end
end end
end end
@ -528,107 +532,110 @@ always @ (*) begin
// Counter CSRs // Counter CSRs
// Get the tied WARLs out the way first // Get the tied WARLs out the way first
MHPMCOUNTER3: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER3: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER4: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER4: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER5: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER5: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER6: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER6: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER7: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER7: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER8: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER8: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER9: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER9: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER10: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER10: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER11: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER11: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER12: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER12: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER13: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER13: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER14: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER14: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER15: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER15: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER16: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER16: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER17: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER17: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER18: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER18: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER19: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER19: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER20: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER20: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER21: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER21: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER22: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER22: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER23: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER23: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER24: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER24: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER25: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER25: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER26: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER26: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER27: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER27: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER28: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER28: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER29: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER29: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER30: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER30: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER31: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER31: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER3H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER3H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER4H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER4H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER5H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER5H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER6H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER6H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER7H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER7H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER8H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER8H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER9H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER9H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER10H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER10H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER11H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER11H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER12H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER12H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER13H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER13H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER14H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER14H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER15H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER15H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER16H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER16H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER17H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER17H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER18H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER18H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER19H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER19H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER20H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER20H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER21H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER21H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER22H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER22H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER23H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER23H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER24H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER24H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER25H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER25H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER26H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER26H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER27H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER27H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER28H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER28H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER29H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER29H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER30H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER30H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMCOUNTER31H: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMCOUNTER31H: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT3: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT3: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT4: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT4: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT5: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT5: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT6: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT6: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT7: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT7: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT8: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT8: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT9: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT9: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT10: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT10: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT11: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT11: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT12: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT12: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT13: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT13: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT14: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT14: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT15: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT15: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT16: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT16: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT17: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT17: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT18: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT18: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT19: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT19: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT20: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT20: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT21: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT21: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT22: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT22: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT23: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT23: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT24: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT24: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT25: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT25: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT26: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT26: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT27: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT27: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT28: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT28: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT29: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT29: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT30: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT30: if (CSR_COUNTER) begin decode_match = 1'b1; end
MHPMEVENT31: if (DECODE_HPM && CSR_COUNTER) begin decode_match = 1'b1; end MHPMEVENT31: if (CSR_COUNTER) begin decode_match = 1'b1; end
MCOUNTINHIBIT: if (CSR_COUNTER) begin decode_match = 1'b1; end MCOUNTINHIBIT: if (CSR_COUNTER) begin
// Phew... decode_match = 1'b1;
rdata = {
29'd0,
mcountinhibit_ir,
1'b0,
mcountinhibit_cy
};
end
MCYCLE: if (CSR_COUNTER) begin MCYCLE: if (CSR_COUNTER) begin
decode_match = 1'b1; decode_match = 1'b1;
rdata = mcycle; rdata = mcycle;
end end
MTIME: if (CSR_COUNTER) begin
decode_match = 1'b1;
rdata = mcycle; // Can be aliased as long as we tie MCOUNTINHIBIT[0] to 0
end
MINSTRET: if (CSR_COUNTER) begin MINSTRET: if (CSR_COUNTER) begin
decode_match = 1'b1; decode_match = 1'b1;
rdata = minstret; rdata = minstret;
@ -638,10 +645,6 @@ always @ (*) begin
decode_match = 1'b1; decode_match = 1'b1;
rdata = mcycleh; rdata = mcycleh;
end end
MTIMEH: if (CSR_COUNTER) begin
decode_match = 1'b1;
rdata = mcycleh; // Can be aliased as long as we tie MCOUNTINHIBIT[0] to 0
end
MINSTRETH: if (CSR_COUNTER) begin MINSTRETH: if (CSR_COUNTER) begin
decode_match = 1'b1; decode_match = 1'b1;
rdata = minstreth; rdata = minstreth;