SVR5

inl(D3)

inl -- read a 32 bit word from a 32 bit I/O port

Synopsis

   #include <sys/types.h>
   #include <sys/ddi.h>
   
   ulong_t inl(int port);

Description

The inl function provides a C language interface to the machine instruction that reads a 32 bit word from a 32 bit I/O port using the I/O address space rather than the memory address space.

Arguments

port: A valid 32 bit I/O port.

Return values

Returns the value of the 32 bit word read from the I/O port.

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

ind(D3oddi) is the equivalent of this function for SCO OpenServer ODDI drivers, although note that the ODDI function is cast as an int rather than a ulong_t.

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

``Programmed I/O (PIO)'' in HDK Technical Reference