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pci_read_config()

Read from the configuration space of a PCI device

Synopsis:

#include <hw/pci.h>

int pci_read_config( void* handle,
                     unsigned offset,
                     unsigned count,
                     size_t size,
                     void* buff );

Arguments:

handle

The handle returned by pci_attach_device().

offset

The offset into the configuration space where you want to read from.

count

The number of objects that you want to read.

size

The size of each object.

buff

A pointer to a buffer where the function can store the objects that it reads.

Library:

libc

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

Description:

The pci_read_config() function reads count objects of the specified size into buff at the given offset from the configuration space of the PCI device specified by handle.

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

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Returns:

PCI_BAD_REGISTER_NUMBER

The offset is invalid.

PCI_BUFFER_TOO_SMALL

The PCI BIOS server reads only 100 bytes at a time; size is too large.

PCI_DEVICE_NOT_FOUND

The handle is invalid.

PCI_SUCCESS

Success.

-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

See also:

pci_attach(), pci_attach_device(), pci_detach(), pci_detach_device(), pci_find_class(), pci_find_device(), pci_present(), 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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