.TH INB 10.2 x86.SH NAMEinb, ins, inl, outb, outs, outl, insb, inss, insl, outsb, outss, outsl \- programmed I/O.SH SYNOPSIS.ta \w'\fLushort 'u.Bint	inb(int port).PP.Bushort	ins(int port).PP.Bulong	inl(int port).PP.Bvoid	outb(int port, int value).PP.Bvoid	outs(int port, ushort value).PP.Bvoid	outl(int port, ulong value).PP.Bvoid	insb(int port, void *address, int count).PP.Bvoid	inss(int port, void *address, int count).PP.Bvoid	insl(int port, void *address, int count).PP.Bvoid	outsb(int port, void *address, int count).PP.Bvoid	outss(int port, void *address, int count).PP.Bvoid	outsl(int port, void *address, int count).SH DESCRIPTIONThe.I x86implementation provides functions to allow kernel codewritten in C to access the I/O address space.On several other architectures such as the PowerPC and Strongarm,the platform-dependent code provides similar functions to accessdevices with an I/O space interface, even when that is memory mapped, to encourage portability of device drivers..PP.IR Inb ,.I insand.I inlapply the corresponding hardware instruction to fetch the next byte, short or longfrom the I/O.IR port ..IR Outb ,.I outsand.I outloutput a.I valueto the I/O.IR port ..PPThe remaining functions transfer.I countbytes, shorts, or longs using programmed I/O between a memory.I addressand.IR port .Functions.BI ins xcopy values into memory; functions.BI outs xcopy values from memory.The.I countis in elements, not bytes..SH SOURCE.B /os/pc/l.s.SH SEE ALSO.IR dma (10.2),.IR isaconfig (10.2)