ref: e391b7ec8c0dc746a70725f3fc598def0419d1e6 dir: /sys/src/ape/lib/ap/riscv64/cycles.s/
/* user-accessible CSRs */ #define CYCLO 0xc00 TEXT cycles(SB), 1, $0 /* cycles since power up */ MOV CSR(CYCLO), RARG RET