int pciconfig_read(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf);int pciconfig_write(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf);int pciconfig_iobase(long which, unsigned long bus, unsigned long devfn);
Most of the interaction with PCI devices is already handled by the
kernel PCI layer,
and thus these calls should not normally need to be accessed from user space.
pciconfig_read()
Reads to
buf from device
dev at offset
off value.
pciconfig_write()
Writes from
buf to device
dev at offset
off value.
pciconfig_iobase()
You pass it a bus/devfn pair and get a physical address for either the
memory offset (for things like prep, this is 0xc0000000),
the IO base for PIO cycles, or the ISA holes if any.
On success zero is returned.
On error, -1 is returned and
errno is set appropriately.
pciconfig_write()
On success zero is returned.
On error, -1 is returned and
errno is set appropriately.
pciconfig_iobase()
Returns information on locations of various I/O
regions in physical memory according to the
which value.
Values for
which are:
IOBASE_BRIDGE_NUMBER,
IOBASE_MEMORY,
IOBASE_IO,
IOBASE_ISA_IO,
IOBASE_ISA_MEM.
This page is part of release 3.44 of the Linux
man-pages project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.