NAME    [Toc]    [Back]

     pci - library interface for PCI bus access

LIBRARY    [Toc]    [Back]

     library ``libpci''

SYNOPSIS    [Toc]    [Back]

     #include <pci.h>

     int
     pcibus_conf_read(int pcifd, u_int bus, u_int dev, u_int func, u_int reg,
             pcireg_t *valp);

     int
     pcibus_conf_write(int pcifd, u_int bus, u_int dev, u_int func, u_int reg,
             pcireg_t val);

     int
     pcidev_conf_read(int devfd, u_int reg, pcireg_t *valp);

     int
     pcidev_conf_write(int devfd, u_int reg, pcireg_t val);

     char *
     pci_findvendor(pcireg_t id_reg);

     void
     pci_devinfo(pcireg_t id_reg, pcireg_t class_reg, char *devinfo);

     void
     pci_conf_print(int pcifd, u_int bus, u_int dev, u_int func);

DESCRIPTION    [Toc]    [Back]

     The pci library provides support for accessing the PCI bus by user programs.


     These functions are available in the libpci library.  Programs should be
     linked with -lpci.

CONFIGURATION SPACE FUNCTIONS    [Toc]    [Back]

     The following functions are used to access PCI configuration space:

     pcibus_conf_read()
           Access the PCI configuration register reg on the device located at
           bus, dev, func, and place the result in *valp.  pcifd must be an
           open file descriptor to a PCI bus within the target PCI domain.

     pcibus_conf_write()
           Write the value specified by val into the PCI configuration register
 rag on the device located at bus, dev, func.  pcifd must be an
           open file descriptor to a PCI bus within the target PCI domain.

     pcidev_conf_read()
           Access the PCI configuration register reg on the device associated
           with the open file descriptor devfd and place the result in *valp.

     pcidev_conf_write()
           Write the value specified by val into the PCI configuration register
 reg on the device associated with the open file descriptor
           devfd.

MISCELLANEOUS FUNCTIONS    [Toc]    [Back]

     The following miscellaneous functions are available:

     pci_findvendor()
           Return an ASCII description of the PCI vendor in the PCI ID register
 id_reg.

     pci_devinfo()
           Return an ASCII description of the PCI vendor, PCI product, and PCI
           class specified by the PCI ID register id_reg and PCI class ID register
 class_reg.  The description is placed into the buffer pointed
           to by devinfo.  The buffer should be at least 256 bytes long.

     pci_conf_print()
           Print the PCI configuration information for the device located at
           bus, dev, func.  pcifd must be an open file descriptor to a PCI bus
           within the target PCI domain.

RETURN VALUES    [Toc]    [Back]

     The pcibus_conf_read(), pcibus_conf_write(), pcidev_conf_read(), and
     pcidev_conf_write() functions return 0 on success and -1 on failure.

     The pci_findvendor() function returns NULL if the PCI vendor description
     cannot be found.

SEE ALSO    [Toc]    [Back]

     pci(4)

HISTORY    [Toc]    [Back]

     The pcibus_conf_read(), pcibus_conf_write(), pcidev_conf_read(),
     pcidev_conf_write(), pci_findvendor(), pci_devinfo(), and
     pci_conf_print() functions first appeared in NetBSD 1.6.

BSD                           September 12, 2001                           BSD