SVR5

outw(D3)

outw -- write a 16 bit short word to a 16 bit I/O port

Synopsis

   #include <sys/types.h>
   #include <sys/ddi.h>
   #include <sys/f_ddi.h>
   
   void outw(int port, ushort_t data);

Description

The outw( ) function provides a C language interface to the machine instruction that writes a 16 bit short word to a 16 bit I/O port, using the I/O address space instead of the memory address space.

Arguments

port: A valid 16 bit I/O port.
data: The 16 bit value to be written to the port.

Return values

None

Usage

Context and synchronization

All contexts.

Hardware applicability

Intel IA-32 compatible platforms

Version applicability

ddi: 1, 2, 3, 4, 5, 5mp, 6, 6mp, 7, 7mp, 7.1, 7.1mp, 8, 8mp

SCO OpenServer ODDI compatibility

outw(D3oddi) is essentially the same function for SCO OpenServer ODDI drivers, but note different castings for the function and its arguments.

DOS systems often issue this function from user-level code. ``Porting DOS inb and outb functionality'' in HDK Technical Reference provides information about how to port such code to SCO OpenServer systems, but this information is generally appropriate for SVR5 systems as well.

References

inb(D3), inl(D3), inw(D3), outb(D3), outl(D3), repinsb(D3), repinsd(D3), repinsw(D3), repoutsb(D3), repoutsd(D3), repoutsw(D3)

``Programmed I/O (PIO)'' in HDK Technical Reference
``Porting DOS inb and outb functionality'' in HDK Technical Reference