/ $Header: $ .unixorder / inb (), as per the System V DDI/DKI: / uchar_t inb (int _port); / / The header file <kernel/x86io.h> contains the prototype. / $Log: $ / .text .globl inb port = 4 inb: mov port(%esp), %edx / port sub %eax, %eax / cheap zero-fill inb (%dx) ret