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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO |
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pciconfig_read(2) System Calls Manual pciconfig_read(2)
pciconfig_read, pciconfig_write, pciconfig_iobase - pci device
information handling
Standard C library (libc, -lc)
#include <pci.h>
int pciconfig_read(unsigned long bus, unsigned long dfn,
unsigned long off, unsigned long len,
unsigned char *buf);
int pciconfig_write(unsigned long bus, unsigned long dfn,
unsigned long off, unsigned long len,
unsigned char *buf);
int pciconfig_iobase(int 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 to indicate the error.
pciconfig_write()
On success, zero is returned. On error, -1 is returned
and errno is set to indicate the error.
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().
Linux.
Linux 2.0.26/2.1.11.
capabilities(7)
Linux man-pages 6.04 2023-03-30 pciconfig_read(2)
Pages that refer to this page: syscalls(2)
Copyright and license for this manual page
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HTML rendering created 2023-06-24 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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