minix/kernel/arch/i386/io_inb.S

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ArmAsm
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/* inb() - Input one byte Author: Kees J. Bot */
/* 18 Mar 1996 */
/* unsigned inb(U16_t port); */
#include <machine/asm.h>
ENTRY(inb)
push %ebp
movl %esp, %ebp
movl 8(%ebp), %edx /* port */
xorl %eax, %eax
inb %dx /* read 1 byte */
pop %ebp
ret