pci_write_config()
Write to the configuration space of a PCI device
Synopsis:
#include <hw/pci.h> int pci_write_config( void* handle, unsigned offset, unsigned count, size_t size, const void* buff );
Arguments:
- handle
- The handle returned by pci_attach_device() .
- offset
- The offset into the configuration space where you want to write the data.
- count
- The number of objects that you want to write.
- size
- The size of each object.
- buff
- A pointer to the data that you want to write.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The pci_write_config() function writes count objects of the specified size from buff at the given offset to the configuration space of the PCI device specified by handle.
You must successfully call
pci_attach()
before calling any of the other PCI functions.
Returns:
- PCI_BAD_REGISTER_NUMBER
- The offset specified is invalid.
- PCI_BUFFER_TOO_SMALL
- The size argument is too large.
- PCI_SET_FAILED
- An error occurred writing to the configuration space of the device.
- PCI_SUCCESS
- Success.
- PCI_UNSUPPORTED_FUNCT
- This device doesn't support writing to its configuration space.
- -1
- You haven't called pci_attach() , or the call to it failed.
Classification:
Safety: | |
---|---|
Cancellation point | Yes |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |