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pciconfig_read
Section: System Calls (2) Updated: 202-0-08 Index
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NAME
pciconfig_read, pciconfig_write, pciconfig_iobase -
pci device information handling
LIBRARY
Standard C library
( libc,~ -lc)
SYNOPSIS
#include <pci.h>
int pciconfig_read(unsigned long bus, unsigned long dfn,
unsigned long off, unsigned long size,
unsigned char *buf);
int pciconfig_write(unsigned long bus, unsigned long dfn,
unsigned long off, unsigned long size,
unsigned char *buf);
int pciconfig_iobase(int 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 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.
ERRORS
- EINVAL
-
size
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().
STANDARDS
Linux.
HISTORY
Linux 2.0.26/2.1.11.
SEE ALSO
capabilities(7)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- STANDARDS
-
- HISTORY
-
- SEE ALSO
-
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