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Comment explaining redundant mstatus.FS check

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Corey Hickson 2025-04-09 11:04:30 -07:00
parent 46955f501e
commit 683c0cac86
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src/privileged/csru.sv
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@ -51,6 +51,8 @@ module csru import cvw::*; #(parameter cvw_t P) (
logic WriteFFLAGSM;
// Write enables
// Explicitly checking STATUS_FS != 0 is redundant since the instruction traps otherwise,
// causing CSRWriteM to go low, but it is left here for safety
assign WriteFRMM = CSRUWriteM & (STATUS_FS != 2'b00) & (CSRAdrM == FRM | CSRAdrM == FCSR);
assign WriteFFLAGSM = CSRUWriteM & (STATUS_FS != 2'b00) & (CSRAdrM == FFLAGS | CSRAdrM == FCSR);