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Read from the configuration space of a PCI device
#include <hw/pci.h>
int pci_read_config( void* handle,
unsigned offset,
unsigned count,
size_t size,
void* buff );
- 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.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
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.
|
You must successfully call
pci_attach()
before calling any of the other PCI functions. |
- 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.
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_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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