ref: cce6dfb94a75af67751e2fab0d961a004e9e51d5 dir: /b_amd64.s/
TEXT _tstart(SB), 1, $0 LFENCE RDTSC MOVL AX, 0(RARG) MOVL DX, 4(RARG) RET TEXT _tend(SB), 1, $0 RDTSC MOVL AX, 0(RARG) MOVL DX, 4(RARG) CPUID RET