Extend the GNU/Hurd back-end to work on 64-bit systems

Use C99 named initializers for struct pci_methods

Rename aux fields in structs pci_access and pci_dev to backend_data

This hopefully conveys the purpose much better than just "aux".

Update license comments and added SPDX license identifiers

Previously, the only information about the specific version of GPL
was present in the README and individual source files mentioned only
GPL

Update license comments and added SPDX license identifiers

Previously, the only information about the specific version of GPL
was present in the README and individual source files mentioned only
GPL alone.

Let us update all copyright comments to explicitly say "GPL v2+"
and also include the machine readable SPDX license identifier.

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hurd: fix filling information

The hurdish methods only implement the region and base information, the
rest should be taken from the generic method.

Simplified pci_fill_info() and friends

Previously, we kept track of which fields were already filled, which
was quite brittle.

Now we keep only the set of already known fields in struct pci_dev.
We

Simplified pci_fill_info() and friends

Previously, we kept track of which fields were already filled, which
was quite brittle.

Now we keep only the set of already known fields in struct pci_dev.
We check if the current field is needed against this information.

Not only this simplifies the whole thing, but it also enables future
back-ends to call pci_fill_info() recursively as needed.

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Hurd: bug fixes and compile again

Hurd: Do not identify devices during scan

Let us keep the bus scan light-weight. Whoever is interested
in device IDs, still has to call pci_fill_info(PCI_FILL_IDENT),
which handles this in generic w

Hurd: Do not identify devices during scan

Let us keep the bus scan light-weight. Whoever is interested
in device IDs, still has to call pci_fill_info(PCI_FILL_IDENT),
which handles this in generic way.

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Hurd: Simplification continues

Hurd: Simplify config space read and write

Hurd: Further simplification

HURD backend should compile again

Fixes a bug introduced by commit 82c06b47dea5a38075ce9d56f743360bc47b4c78.

Hurd: avoid redundant checks for port validity

HURD: Use MACH_PORT_NULL to initialize the port

Hurd: Fix multiline strings

Library: Big cleanup of pci_fill_info()

There was a lot of minor issues in the implementation of the fill_info
call-back in various back-ends. Most importantly, semantics of pci_dev->
known_fields w

Library: Big cleanup of pci_fill_info()

There was a lot of minor issues in the implementation of the fill_info
call-back in various back-ends. Most importantly, semantics of pci_dev->
known_fields was not formally defined and it was implemented inconsistently.

We now define known_fields as the set of fields which were already
obtained during the lifetime of the pci_dev. We never consider known
fields which are not supported by the back-end. All fields which are
unsupported by either the back-end, the OS, or the particular device,
are guaranteed to have sensible default values (0 or NULL). Also, bit
masks are always unsigned except for the signature of pci_fill_info()
which should be preferably kept stable.

All back-ends and the pci_generic_fill_info() function have been changed
to follow this semantics.

In the sysfs back-end, we read as few attributes as possible during
device initialization, so applications which use pci_get_dev() are not
slowed down unnecessarily.

In the Hurd back-end, we also respect the buscentric mode.

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Hurd: Fix minor indentation problems

Hurd: Fix bug: pci_get_dev() and dev->aux

Allow clients to read and write from a device w/o a bus scan

New access method: Hurd via RPCs

A new module for the Hurd that accesses PCI bus using available RPCs.