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Determine whether or not PCI BIOS is present
#include <hw/pci.h>
int pci_present( unsigned* lastbus,
unsigned* version,
unsigned* hardware );
- lastbus
- The number of the last PCI bus in the system. PCI buses are numbered
from 0, up to and including this value.
- version
- The version number of the PCI interface.
- hardware
- The specific hardware characteristics the platform supports with
regard to accessing configuration space and generating PCI
Special Cycles.
The PCI specification defines two hardware mechanisms for accessing
configuration space. Bit 0 of hardware is set (1) if
mechanism 1 is supported, and reset (0) otherwise. Bit 1 is set (1)
if mechanism 2 is supported, and reset (0) otherwise.
The specification also defines hardware mechanisms for generating
Special Cycles. Bit 4 of hardware is set (1) if the
platform supports Special Cycle generation based on Config Mechanism 1,
and reset (0) otherwise. Bit 5 is set (1) if the platform supports
Special Cycle generation based on Config Mechanism 2, and reset (0)
otherwise.
The arguments can be NULL if you just want to check for PCI
capabilities.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The pci_present() function determines whether or not the PCI BIOS
interface function set is present. It also determines the following:
- the current interface version
- what hardware mechanism for accessing configuration space is supported
- whether or not the hardware supports the generation of PCI Special Cycles.
|
You must successfully call
pci_attach()
before calling any of the other PCI functions. |
- -1
- PCI BIOS isn't present.
- PCI_SUCCESS
- PCI BIOS is present.
QNX Neutrino
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
pci_attach(),
pci_attach_device(),
pci_detach(),
pci_detach_device(),
pci_find_class(),
pci_find_device(),
pci_read_config(),
pci_read_config8(),
pci_read_config16(),
pci_read_config32(),
pci_rescan_bus(),
pci_write_config(),
pci_write_config8(),
pci_write_config16(),
pci_write_config32()
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