L2CAP: Major refactor of the whole component.

(And surrounding portions of the "btCoreData" module.)

* Rewrote the main "l2cap.h" header representing protocol constants
and structures. Now conforms to general Haiku naming conventions
rather than BSD ones. Some more constants added/removed based
on the most recent Bluetooth specification.

* Rewrote all code derived from the BSDs to match Haiku conventions
and structures in the driver.

* Dropped the "channel" and "frame" structures from "btCoreData".
Channels are now managed by L2capEndpoints, and "frames" are
now just plain net_buffers without surrounding structures.
This also makes state management much simpler.

* Made it so that actual net_buffers are passed through to the
l2cap_receive function rather than another data structure.
A fake interface address is used to communicate connection
information. (This probably ought to be changed, though.)

* Get rid of l2cap_lower and l2cap_upper abstractions.
Everything related to channel/endpoint management is now
done in L2capEndpoint, while buffer reception is handled
directly in l2cap_receive and elsewhere, same as other drivers.

* Wire up more hooks and fix module flags (needed to be able to
get the module loaded and opening sockets at all.)

* Implement an actual locking strategy in L2capEndpoint
and HciConnection. There's still problems with lifetime
management, but at least thread-safety is mostly handled.

* Create an L2capEndpointManager and use it to manage
the endpoints, rather than having a single (unsafe)
linked-list.

And plenty of other refactorings and cleanups besides.
There's still more to be done for Bluetooth overall, though:

* The "btCoreData" and "hci" modules also badly need a major
overhaul, and should be merged into a single "bluetooth"
bus_manager. They also shouldn't be passing around pointers
to other modules like this.

* There's a number of TODOs/FIXMEs in the L2CAP module, most
notably around timeouts (especially command timeouts) and
parameter validation/specification.

Tested by myself with kallisti5's help. Incoming connections
(on the PSM for SDP) get all the way to the latter half
of the Configuration step before hanging.

Distinguish KERNEL_ARCH_DIR from KERNEL_ARCH.

On x86_64, the KERNEL_ARCH should really be "x86_64", but it was "x86"
as the architecture sources/headers directory is shared between 32 and 64 bit.

Should not be a functional change on any platform outside x86_64.

system/boot: Add support for multiple bootloaders

bluetooth/btCoreData: x86_64 build fixes

Preparation for merge of x86 and x86_64 kernel sources.

Since x86 and x86_64 share a lot of common code, x86_64 kernel sources/headers
are going to reside under headers/private/kernel/arch/x86 and
src/system/kernel/arch/x86 along with the existing x86 code. This commit
changes the build system to handle this. A new variable, TARGET_KERNEL_ARCH,
has been added. This is the name of the kernel/boot architecture directory
name, set to x86 on both x86 and x86_64. This is now used in all places where
TARGET_ARCH was used to get to kernel arch sources/headers (I've changed
everything necessary as far as I can tell). Kernel won't build for x86_64
at the moment as the sources have not been merged, loader does.

- Add bluetooth kernel module intented to manage all internal data structures
-Managing for HCI connections
-Managing of L2cap Channels
-Pending frames
-Interface with KDL



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28726 a95241bf-73f2-0310-859d-f6bbb57e9c96

Preparation for merge of x86 and x86_64 kernel sources.

Since x86 and x86_64 share a lot of common code, x86_64 kernel sources/headers
are going to reside under headers/private/kernel/arch/x86 and
src/system/kernel/arch/x86 along with the existing x86 code. This commit
changes the build system to handle this. A new variable, TARGET_KERNEL_ARCH,
has been added. This is the name of the kernel/boot architecture directory
name, set to x86 on both x86 and x86_64. This is now used in all places where
TARGET_ARCH was used to get to kernel arch sources/headers (I've changed
everything necessary as far as I can tell). Kernel won't build for x86_64
at the moment as the sources have not been merged, loader does.

- Add bluetooth kernel module intented to manage all internal data structures
-Managing for HCI connections
-Managing of L2cap Channels
-Pending frames
-Interface with KDL



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28726 a95241bf-73f2-0310-859d-f6bbb57e9c96