mcycleh
High-half machine Cycle Counter
High-half alias of mcycle.
Software write
This CSR may store a value that is different from what software attempts to write.
When a software write occurs (e.g., through csrrw), the following determines the written value:
COUNT = # since writes to this register may not be hart-local, it must be handled
# as a special case
if (xlen() == 32) {
return sw_write_mcycle({csr_value.COUNT[31:0], read_mcycle()[31:0]});
} else {
return sw_write_mcycle(csr_value.COUNT);
}
Software read
This CSR may return a value that is different from what is stored in hardware.
return read_mcycle()[63:32];