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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

       capabilities(7)

COLOPHON

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



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