PCICONFIG_READ
PCICONFIG_READ
NAMESYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO
COLOPHON
NAME
pciconfig_read, pciconfig_write, pciconfig_iobase − pci device information handling
SYNOPSIS
#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);
DESCRIPTION
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.
RETURN VALUE
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.
ERRORS
|
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(). |
CONFORMING TO
These calls are Linux-specific, available since Linux 2.0.26/2.1.11.
SEE ALSO
COLOPHON
This page is part of release 3.69 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 http://www.kernel.org/doc/man−pages/.
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