pci_read_config8()

Read a byte from the configuration space of a device

Synopsis:

#include <hw/pci.h>

int pci_read_config8( unsigned bus,
                      unsigned dev_func,
                      unsigned offset,
                      unsigned count,
                      char* buff );

Arguments:

bus
The bus number.
dev_func
The name of the device or function.
offset
The register offset into the configuration space, in the range [0...255].
count
The number of bytes to read.
buff
A pointer to a buffer where the requested bytes are placed.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pci_read_config8() function reads the specified number of bytes from the configuration space of the given device or function.

You must successfully call pci_attach() before calling any of the other PCI functions.

Returns:

PCI_BAD_REGISTER_NUMBER
An invalid register offset was given.
PCI_BUFFER_TOO_SMALL
The PCI BIOS server reads only 100 bytes at a time; count is too large.
PCI_SUCCESS
The device or function was found.
-1
You haven't called pci_attach() , or the call to it failed.

Classification:

QNX Neutrino

Safety:
Cancellation point Yes
Interrupt handler No
Signal handler Yes
Thread Yes