обработка информации об устройстве pci (pci device information handling)
Имя (Name)
pciconfig_read, pciconfig_write, pciconfig_iobase - pci device
information handling
Синопсис (Synopsis)
#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);
Описание (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.
Возвращаемое значение (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.
Ошибки (Error)
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().
Стандарты (Conforming to)
These calls are Linux-specific, available since Linux
2.0.26/2.1.11.
Смотри также (See also)
capabilities(7)
