Issue
Been going through the linux kernel code and I have seen this:
__asm__("inl (%%dx)..."
Been trying to look it up online but couldnt find any docs on this instruction.
Its supposed to be something related to I/O.
Solution
It is the IN instruction with a 16-bit port argument (%dx) and a 32-bit destination value (%eax):
OpCode Instruction Op/En 64-Bit Mode Compat/Leg Mode Description
ED IN EAX,DX ZO Valid Valid Input doubleword from I/O port in DX into EAX.
It reads a DWORD from the I/O address space.
Answered By - zx485 Answer Checked By - Cary Denson (WPSolving Admin)