SIMPLE SOLUTIONS

PCICONFIG_READ, PCICONFIG_WRITE, … - reference manual online

Pci device information handling.

Chapter
2003-07-14
PCICONFIG_READ(2)                   Linux Programmer's Manual                   PCICONFIG_READ(2)

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 off‐ set (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 appropri‐ ately. pciconfig_write() On success, zero is returned. On error, -1 is returned and errno is set appropri‐ ately. pciconfig_iobase() Returns information on locations of various I/O regions in physical memory accord‐ ing 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 pcicon‐ fig_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 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
Linux 2003-07-14 PCICONFIG_READ(2)
This manual Reference Other manuals
pciconfig_read(2) referred by syscalls(2)
refer to capabilities(7)