Hello all, can somebody explain me the following assembly syntax, this I have seen in Linux kernel code. asm volatile("int $0x16" : "+a" (ax), "+b" (bx) : : "ecx", "edx", "esi", "edi"); I did not understand :"+a" mean. what does "+" tell there? Generally we use "=a", indicating the output operands and other registers are indicated as clobbered registeres. TIA dinesh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ