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-.\" Contributed by Niki A. Rahimi, LTC Security Development
-.\" narahimi@us.ibm.com
-.\"
-.\" %%%LICENSE_START(FREELY_REDISTRIBUTABLE)
-.\" May be freely distributed and modified.
-.\" %%%LICENSE_END
-.\"
-.TH pciconfig_read 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-pciconfig_read, pciconfig_write, pciconfig_iobase \-
-pci device information handling
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <pci.h>
-.P
-.BI "int pciconfig_read(unsigned long " bus ", unsigned long " dfn ,
-.BI " unsigned long " off ", unsigned long " len ,
-.BI " unsigned char *" buf );
-.BI "int pciconfig_write(unsigned long " bus ", unsigned long " dfn ,
-.BI " unsigned long " off ", unsigned long " len ,
-.BI " unsigned char *" buf );
-.BI "int pciconfig_iobase(int " which ", unsigned long " bus ,
-.BI " unsigned long " devfn );
-.fi
-.SH 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.
-.TP
-.BR pciconfig_read ()
-Reads to
-.I buf
-from device
-.I dev
-at offset
-.I off
-value.
-.TP
-.BR pciconfig_write ()
-Writes from
-.I buf
-to device
-.I dev
-at offset
-.I off
-value.
-.TP
-.BR 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.
-.SH RETURN VALUE
-.TP
-.BR pciconfig_read ()
-On success, zero is returned.
-On error, \-1 is returned and
-.I errno
-is set to indicate the error.
-.TP
-.BR pciconfig_write ()
-On success, zero is returned.
-On error, \-1 is returned and
-.I errno
-is set to indicate the error.
-.TP
-.BR pciconfig_iobase ()
-Returns information on locations of various I/O
-regions in physical memory according to the
-.I which
-value.
-Values for
-.I which
-are:
-.BR IOBASE_BRIDGE_NUMBER ,
-.BR IOBASE_MEMORY ,
-.BR IOBASE_IO ,
-.BR IOBASE_ISA_IO ,
-.BR IOBASE_ISA_MEM .
-.SH ERRORS
-.TP
-.B EINVAL
-.I len
-value is invalid.
-This does not apply to
-.BR pciconfig_iobase ().
-.TP
-.B EIO
-I/O error.
-.TP
-.B ENODEV
-For
-.BR pciconfig_iobase (),
-"hose" value is NULL.
-For the other calls, could not find a slot.
-.TP
-.B ENOSYS
-The system has not implemented these calls
-.RB ( CONFIG_PCI
-not defined).
-.TP
-.B EOPNOTSUPP
-This return value is valid only for
-.BR pciconfig_iobase ().
-It is returned if the value for
-.I which
-is invalid.
-.TP
-.B EPERM
-User does not have the
-.B CAP_SYS_ADMIN
-capability.
-This does not apply to
-.BR pciconfig_iobase ().
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 2.0.26/2.1.11.
-.SH SEE ALSO
-.BR capabilities (7)