repoutsw(D3) repoutsw(D3)
NAME
repoutsw - write 16 bit words from buffer to an I/O port
SYNOPSIS
#include <sys/types.h>
#include <sys/ddi.h>
void repoutsw(int port, ushort_t *addr, int cnt);
Arguments
port A valid 16 bit I/O port.
addr The address of the buffer from which cnt 16 bit
words are written to the I/O port.
cnt The number of 16 bit words to be written to the I/O
port.
DESCRIPTION
The repoutsw function provides a C language interface to the
machine instructions that write a string of 16 bit short words
to a 16 bit I/O port using the I/O address space, instead of
the memory address space. cnt 16 bit words starting at the
address pointed to by addr are written to the I/O port in cnt
write operations.
Return Values
None
USAGE
The buffer should be at least cnt 16 bit words in length.
This function may not be meaningful on all implementations
because some implementations may not support I/O-mapped I/O
(direct I/O instructions). On Intel860 systems, I/O is mapped
to memory (memory-mapped I/O). Therefore, on Intel860
systems, a port is not really an I/O port, but rather a memory
pointer that points to the memory-mapped I/O location. The
port argument is similar to a token that can represent a 16-
bit address for the I/O port for Intel386 systems or a 32-bit
memory address for Intel860 systems.
Level
Initialization, Base or Interrupt.
Copyright 1994 Novell, Inc. Page 1
repoutsw(D3) repoutsw(D3)
Synchronization Constraints
Does not sleep.
Driver-defined basic locks, read/write locks, and sleep locks
may be held across calls to this function.
REFERENCES
inb(D3), inl(D3), inw(D3), outb(D3), outl(D3), outw(D3),
repinsb(D3), repinsd(D3), repinsw(D3), repoutsb(D3),
repoutsd(D3)
NOTICES
Portability
AT-compatible architectures
Applicability
ddi: 1, 2, 3, 4, 5, 5mp, 6, 6mp, 7, 7mp
Copyright 1994 Novell, Inc. Page 2