Originální popis anglicky:
pciconfig_read, pciconfig_write, pciconfig_iobase - pci device information
handling
Návod, kniha: Linux Programmer's Manual
#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 userspace.
- 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
pci_iobase.
- EIO
- I/O error.
- ENODEV
- For pci_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 only valid for pci_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 pci_iobase.
These calls are Linux specific, available since Linux 2.0.26/2.1.11.
capabilities(7)
