ref: 64462bb36f34be7ab4aa1fcf7195739eb617a044 dir: /mbld/cpufeatures+plan9-x64.s/
TEXT bld$cpufeatures+0(SB),$0 MOVL $0x1,AX CPUID MOVL CX, AX MOVL DX, DX ROLQ $32, DX ORQ DX, AX RET