ref: dac7595daa2a23be27133fb13de340d4c2b7879d
dir: /pc/x86.c/
#include <u.h> extern inline void outb(uint16 port, uint8 data) { asm volatile("out %0, %1" : : "a" (data), "d" (port)); } extern inline uint8 inb(uint16 port) { uint8 data; asm volatile("in %1, %0" : "=a" (data) : "d" (port)); return data; }