Prevent spurious recompiles on account of changed version.

After a local commit, any file that included version.h would have to
be recompiled on account of the changed version string. This changes
version.h in the build directory to rbversion.h and includes the
preprocessor macro from rbversion.h in firmware/common/version.c so
that only that one file needs to be recompiled after a local commit
rather than a whole slew of them.

Change-Id: I900d97e3a24a0610698283416d97b4fa3a3a2cf6
Reviewed-on: http://gerrit.rockbox.org/937
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested: Michael Sevakis <jethead71@rockbox.org>
Fix up the bootloaders

They can't access the raw RBVERSION define any longer.

Change-Id: I698062b36306399945c01de54cdccaa1a1a8434e
Rewrite filesystem code (WIP)

This patch redoes the filesystem code from the FAT driver up to the
clipboard code in onplay.c.

Not every aspect of this is finished therefore it is still "WIP". I
don't wish to do too much at once (haha!). What is left to do is get
dircache back in the sim and find an implementation for the dircache
indicies in the tagcache and playlist code or do something else that
has the same benefit. Leaving these out for now does not make anything
unusable. All the basics are done.

Phone app code should probably get vetted (and app path handling
just plain rewritten as environment expansions); the SDL app and
Android run well.

Main things addressed:
1) Thread safety: There is none right now in the trunk code. Most of
what currently works is luck when multiple threads are involved or
multiple descriptors to the same file are open.

2) POSIX compliance: Many of the functions behave nothing like their
counterparts on a host system. This leads to inconsistent code or very
different behavior from native to hosted. One huge offender was
rename(). Going point by point would fill a book.

3) Actual running RAM usage: Many targets will use less RAM and less
stack space (some more RAM because I upped the number of cache buffers
for large memory). There's very little memory lying fallow in rarely-used
areas (see 'Key core changes' below). Also, all targets may open the same
number of directory streams whereas before those with less than 8MB RAM
were limited to 8, not 12 implying those targets will save slightly
less.

4) Performance: The test_disk plugin shows markedly improved performance,
particularly in the area of (uncached) directory scanning, due partly to
more optimal directory reading and to a better sector cache algorithm.
Uncached times tend to be better while there is a bit of a slowdown in
dircache due to it being a bit heavier of an implementation. It's not
noticeable by a human as far as I can say.

Key core changes:
1) Files and directories share core code and data structures.

2) The filesystem code knows which descriptors refer to same file.
This ensures that changes from one stream are appropriately reflected
in every open descriptor for that file (fileobj_mgr.c).

3) File and directory cache buffers are borrowed from the main sector
cache. This means that when they are not in use by a file, they are not
wasted, but used for the cache. Most of the time, only a few of them
are needed. It also means that adding more file and directory handles
is less expensive. All one must do in ensure a large enough cache to
borrow from.

4) Relative path components are supported and the namespace is unified.
It does not support full relative paths to an implied current directory;
what is does support is use of "." and "..". Adding the former would
not be very difficult. The namespace is unified in the sense that
volumes may be specified several times along with relative parts, e.g.:
"/<0>/foo/../../<1>/bar" :<=> "/<1>/bar".

5) Stack usage is down due to sharing of data, static allocation and
less duplication of strings on the stack. This requires more
serialization than I would like but since the number of threads is
limited to a low number, the tradoff in favor of the stack seems
reasonable.

6) Separates and heirarchicalizes (sic) the SIM and APP filesystem
code. SIM path and volume handling is just like the target. Some
aspects of the APP file code get more straightforward (e.g. no path
hashing is needed).

Dircache:
Deserves its own section. Dircache is new but pays homage to the old.
The old one was not compatible and so it, since it got redone, does
all the stuff it always should have done such as:

1) It may be update and used at any time during the build process.
No longer has one to wait for it to finish building to do basic file
management (create, remove, rename, etc.).

2) It does not need to be either fully scanned or completely disabled;
it can be incomplete (i.e. overfilled, missing paths), still be
of benefit and be correct.

3) Handles mounting and dismounting of individual volumes which means
a full rebuild is not needed just because you pop a new SD card in the
slot. Now, because it reuses its freed entry data, may rebuild only
that volume.

4) Much more fundamental to the file code. When it is built, it is
the keeper of the master file list whether enabled or not ("disabled"
is just a state of the cache). Its must always to ready to be started
and bind all streams opened prior to being enabled.

5) Maintains any short filenames in OEM format which means that it does
not need to be rebuilt when changing the default codepage.

Miscellaneous Compatibility:
1) Update any other code that would otherwise not work such as the
hotswap mounting code in various card drivers.

2) File management: Clipboard needed updating because of the behavioral
changes. Still needs a little more work on some finer points.

3) Remove now-obsolete functionality such as the mutex's "no preempt"
flag (which was only for the prior FAT driver).

4) struct dirinfo uses time_t rather than raw FAT directory entry
time fields. I plan to follow up on genericizing everything there
(i.e. no FAT attributes).

5) unicode.c needed some redoing so that the file code does not try
try to load codepages during a scan, which is actually a problem with
the current code. The default codepage, if any is required, is now
kept in RAM separarately (bufalloced) from codepages specified to
iso_decode() (which must not be bufalloced because the conversion
may be done by playback threads).

Brings with it some additional reusable core code:
1) Revised file functions: Reusable code that does things such as
safe path concatenation and parsing without buffer limitations or
data duplication. Variants that copy or alter the input path may be
based off these.

To do:
1) Put dircache functionality back in the sim. Treating it internally
as a different kind of file system seems the best approach at this
time.

2) Restore use of dircache indexes in the playlist and database or
something effectively the same. Since the cache doesn't have to be
complete in order to be used, not getting a hit on the cache doesn't
unambiguously say if the path exists or not.

Change-Id: Ia30f3082a136253e3a0eae0784e3091d138915c8
Reviewed-on: http://gerrit.rockbox.org/566
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested: Michael Sevakis <jethead71@rockbox.org>
Add mempcpy implementation

A GNU extension that returns dst + size instead of dst. It's a nice
shortcut when copying strings with a known size or back-to-back blocks
and you have to do it often.

May of course be called directly or alternately through
__builtin_mempcpy in some compiler versions.

For ASM on native targets, it is implemented as an alternate entrypoint
to memcpy which adds minimal code and overhead.

Change-Id: I4cbb3483f6df3c1007247fe0a95fd7078737462b
Add normal alloca() definition and implement a strdupa and friends

Change-Id: I21c9c21fd664fb11bc8496ace4a389f535a030d6
Hopefully fix most of the errors and warnings from the last push

Change-Id: I1a466b2d55f120796910039a0296ca324c58e891
Get the last errors I hope!

Change-Id: Ia285b95480cc9ac6494b745d80892c4b1b912341
Fix last warning for Warble

Unused result warnings will have to be dealt with separately.

Change-Id: I00c45e28d4d43a5376745036e650ff8df576c2db
Remove I/O priority. It is harmful when used with the new file code.

HAVE_IO_PRIORITY was defined for native targets with dircache.

It is already effectively disabled for the most part since dircache no
longer lowers its thread's I/O priority. It existed primarily for the
aforementioned configuration.

Change-Id: Ia04935305397ba14df34647c8ea29c2acaea92aa
Fix a small late creep-in goof in path parsing on native targets

Anything of one dot and one character (e.g. ".a") would get treated as
"." because I left out a condition when converting to recursionless
parsing of relative components. Git 'er fixed up.

Change-Id: Id5603ce0858b419dc08b1d496b4b187a573595f9
Clean up a bit and get switch statement out of loop in walk_path()

It's nicer to look at and it obfuscated a bug where it should have
exited the loop instead of the case (you probably wouldn't observe
the effect very often).

Change-Id: I33f3c72c8bb7e11b9d418f66cf84efc3082a37b4
hwpatcher: add generic RKW file patching script

This script is handy hacking tool to patch RKW file with
arbitrary binary and put jump into implanted code.
It also shows how to use hwstub crc routine.

Change-Id: I89b5086dc1ddaca3dbc03df26a85472d8a20d51e
Updated pictures of the YH's for the manual.

SVG changes: fixed some quirks in Samsung logo, aligned text, cleanup.

Change-Id: I29e43e68782b5d7b325d16e15e02c79a131349c6
optimize WSPLL work for iriver h100 and h300 series

For Iriver h100 & h300 series we don't need always use WSPLL,
because in most cases WSPLL clock and SYSCLK has the same value,
and we have additional WSPLL errors to the output clock. Now that is fixed.

Change-Id: I04aebee659c57c45dc8603e409b9db42bdde534a
Reviewed-on: http://gerrit.rockbox.org/434
Reviewed-by: Marcin Bukat <marcin.bukat@gmail.com>
sbtools: use default transfer size if it cannot be probed

A older commit removed this ability but it tends to be a problem since the HID
driver can prevent probing of transfer size which then needs to be entered
by hand on the command line.

Change-Id: Ie5a556ffdcc2adec0e1c984810983e19136b6473
hwstub: remove protocol to make it use its own interface

This way, hwstub can be implemented along with other usb features/interfaces.

Change-Id: I7148cab845049cc0a8b8e740fa0d52d3a385eaed
hwstub: fix library to actually work and compile, still miss some functions

Change-Id: I968dafb4dca7d674165a43e3a435762fe38ed37f
hwstub: don't put revision in the protocol, it's specific to the implementation

Change-Id: I1311a22da41fe977f1613f1e313a864baa03027c
hwstub: fix horrible bug

Change-Id: I8042f692045a23dbb545d840e5169ce4b99fe5d2
hwstub: fix missing \n

Change-Id: I077a38d8a8905b7ad686d0d00b2a8a48bd206ade