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PCI(3)			 BSD 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 reg 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.

BSD				April 24, 2004				   BSD

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