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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON |
PCICONFIG_READ(2) Linux Programmer's Manual PCICONFIG_READ(2)
pciconfig_read, pciconfig_write, pciconfig_iobase - pci device infor‐
mation handling
#include <pci.h>
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.
pciconfig_read()
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.
EINVAL len value is invalid. This does not apply to
pciconfig_iobase().
EIO I/O error.
ENODEV For pciconfig_iobase(), "hose" value is NULL. For the other
calls, could not find a slot.
ENOSYS The system has not implemented these calls (CONFIG_PCI not
defined).
EOPNOTSUPP
This return value is valid only for pciconfig_iobase(). It is
returned if the value for which is invalid.
EPERM User does not have the CAP_SYS_ADMIN capability. This does
not apply to pciconfig_iobase().
These calls are Linux-specific, available since Linux 2.0.26/2.1.11.
capabilities(7)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2016-07-17 PCICONFIG_READ(2)
Pages that refer to this page: syscalls(2)