pci_read_config32()

Read 32-bit values from the configuration space of a device

Synopsis:

#include <hw/pci.h>

int pci_read_config32( 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. This offset must be aligned to a 32-bit boundary (that is 0, 4, 8, …, 252 bytes).
count: The number of 32-bit values to read.
buff: A pointer to a buffer where the requested 32-bit values 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_config32() function reads the specified number of 32-bit values 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_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