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Reset mtimecmp in clint

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This commit is contained in:
David Harris 2022-06-23 21:20:55 +00:00
parent 4c8f5fbd89
commit ceddc99ac9
1 changed files with 2 additions and 4 deletions
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6
pipelined/src/uncore/clint.sv
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@ -60,7 +60,7 @@ module clint (
flopr #(16) entrydflop(HCLK, ~HRESETn, entry, entryd); flopr #(16) entrydflop(HCLK, ~HRESETn, entry, entryd);
assign HRESPCLINT = 0; // OK assign HRESPCLINT = 0; // OK
assign HREADYCLINT = 1'b1; // *** needs to depend on DONE during accesses assign HREADYCLINT = 1'b1; // *** needs to depend on DONE during asynchronous MTIME accesses
// word aligned reads // word aligned reads
if (`XLEN==64) assign #2 entry = {HADDR[15:3], 3'b000}; if (`XLEN==64) assign #2 entry = {HADDR[15:3], 3'b000};
@ -87,8 +87,7 @@ module clint (
always_ff @(posedge HCLK or negedge HRESETn) always_ff @(posedge HCLK or negedge HRESETn)
if (~HRESETn) begin if (~HRESETn) begin
MSIP <= 0; MSIP <= 0;
MTIMECMP <= 0; MTIMECMP <= 0xFFFFFFFFFFFFFFFF; // Spec says MTIMECMP is not reset, but we reset to maximum value to prevent spurious timer interrupts
// MTIMECMP is not reset
end else if (memwrite) begin end else if (memwrite) begin
if (entryd == 16'h0000) MSIP <= HWDATA[0]; if (entryd == 16'h0000) MSIP <= HWDATA[0];
if (entryd == 16'h4000) begin if (entryd == 16'h4000) begin
@ -104,7 +103,6 @@ module clint (
always_ff @(posedge HCLK or negedge HRESETn) always_ff @(posedge HCLK or negedge HRESETn)
if (~HRESETn) begin if (~HRESETn) begin
MTIME <= 0; MTIME <= 0;
// MTIMECMP is not reset
end else if (memwrite & entryd == 16'hBFF8) begin end else if (memwrite & entryd == 16'hBFF8) begin
// MTIME Counter. Eventually change this to run off separate clock. Synchronization then needed // MTIME Counter. Eventually change this to run off separate clock. Synchronization then needed
for(j=0;j<`XLEN/8;j++) for(j=0;j<`XLEN/8;j++)