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PCI(3)                  NetBSD Library Functions Manual                 PCI(3)


NAME

     pci -- library interface for PCI bus access


LIBRARY

     PCI Bus Access Library (libpci, -lpci)


SYNOPSIS

     #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,
         size_t len);

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


DESCRIPTION

     The pci library provides support for accessing the PCI bus by user pro-
     grams.

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


CONFIGURATION SPACE FUNCTIONS

     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 regis-
           ter 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 regis-
           ter reg on the device associated with the open file descriptor
           devfd.


MISCELLANEOUS FUNCTIONS

     The following miscellaneous functions are available:

     pci_findvendor()
           Return an ASCII description of the PCI vendor in the PCI ID regis-
           ter 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 reg-
           ister class_reg.  The description is placed into the buffer pointed
           to by devinfo; the size of that buffer is specified in len.

     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

     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

     pci(4)


HISTORY

     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.

NetBSD 4.0                      April 24, 2004                      NetBSD 4.0