pci(3) - NetBSD Manual Pages

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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
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