libfile: open_and_lseek: enlarge small files enough to make lseek possible ...

This makes the following do the expected thing:

	barebox@barebox sandbox:/ ls -l lala
	-rwxrwxrwx              4 lala
	barebox@barebox sandbox:/ mw -d lala 72 0

Without this patch mw dies with

	lseek: Invalid argument

memset, memcpy and probably others benefit in the same way.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

libfile: open_and_lseek: don't imply O_RDONLY ...

There are several users that pass O_RDWR or O_WRONLY in mode to
open_and_lseek() and use the resulting file descriptor for writing. This
is no real issue becauce O_RDONLY is 0 and so can be dropped without
any side effects.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

cmdlinepart: Allow empty string ...

Currently when cmdlinepart_do_parse() is called with an empty
partitions string then an unnamed partition with size 0 is created.
This is wrong of course and instead no partition should be
created.

With this barebox no longer crashes while booting when all partitions
are deleted on the commandline using "nand0.partitions="

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

lib: Add shared copies of some GCC library routines ...

This commit is based on these linux kernel commits:

| commit b35cd98
| Author: Palmer Dabbelt <palmer@dabbelt.com>
| Date:   Tue May 23 10:28:26 2017 -0700
|
|     lib: Add shared copies of some GCC library routines
|
| commit e3d5980
| Author: Matt Redfearn <matt.redfearn@mips.com>
| Date:   Wed Apr 11 08:50:17 2018 +0100
|
|     lib: Rename compiler intrinsic selects to GENERIC_LIB_*

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/mvebu'

ARM: lib64: Make string functions aware of MMU configuration ...

Optimized version of memset() in memset.S if called as:

    memset(foo, 0, size)

will try to explicitly zero out data cache with:

    dc	zva, dst

which will result in Alignement Exception (DABT) if MMU is not
enabled.

For more info see:

    - C4.4.8 "DC ZVA, Data Cache Zero by VA"
    - D5.2.8 "The effects of disabling a stage of address translation"

in "ARM Architecture Reference Manual. ARMv8, for ARMv8-A architecture
profile"

In similar vein, using optimized version of memcpy() could lead to a
unaligned 16-byte write (using 'stp'), which is not allowed for
Device-nGnRnE type of memory (see D5.2.8) and would liead to
Alignement Exception.

To fix both problems expose non-optimized and optimzied versions of
the function and created a wrapper to dispatch the call to either one
based on if MMU is enabled or not.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

libfile: implement new helper write_file_flash() ...

Compared to write_file() this new function also calls erase() to be
suitable for flash devices.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Introduce console_drain() ...

Generalize high baud rate UART polling code found in lib/xmodem.c and
expose it as a generic function in console API.

The usecase for this -- besides X/Y-mode data transfers where the code
originated -- is command/reply type of serial exchages at high baud
rates (~1Mbaud) with payloads exceeding inernal UART FIFOs in
size. Such interactions are not uncommon in serdev device and this
patch is done in preparation for serdev support code that will follow.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/misc'

glob: do not unnecessarily opendir() a directory ...

opendir() can trigger automounts, so do not use it when the
pattern we examine doesn't have any wildcards.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

lib: Port CRC-CCITT functions from Linux kernel ...

Port CRC-CCITT implemenation in order to support porting MFD driver
for RAVE SP.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/ratp'

ratp: allow building without full console support ...

Make CONFIG_RATP a selectable config option, so that the user can
enable RATP support without explicitly needing to enable the full
console support over RATP (e.g. only for RATP FS or built-in command
support).

The full console can still be explicitly enabled with
CONFIG_CONSOLE_RATP.

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

lib: add weak clz/ctz functions ...

This is a copy of the Linux kernel implementation. This adds weak
functions for the clz and ctz gcc builtins. Normally GCC will map
those builtins to CPU instructions directly, but for CPUs where those
are unavailable, we need to provide a fallback implementation.

Fixes build of the zlib decompressor on ARMv4 CPUs.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/zstd'

Merge branch 'for-next/tftp-workaround'

Merge branch 'for-next/ratp'

Merge branch 'for-next/misc'

lib: Add zstd decompression module ...

Based on kernel commit 73f3d1b48f50 ("lib: Add zstd modules").

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

lib: Add xxhash module ...

Based on kernel commit 5d2405227a9e ("lib: Add xxhash module").

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs/parseopt: Add parseopt_llu_suffix ...

Add an option parser using strtoull_suffix that can be used to
parse a loop mount offset option.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

libfile: Make write_file buffer const ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ratp: move barebox-specific command to ratp_bb.h ...

The ratp_run_command() is really an implementation detail of the
barebox ratp 'command' operation support. Move it to the barebox
specific header and rename it with the correct prefix.

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

libfile: implement a function to cache a file ...

Due to the nature of TFTP which can't lseek and due to the silliness
of our filesystem implementation which can't cache accesses we have to
manually cache files on TFTP filesystems sometimes. Make it easier
for them by providing a cache_file() function which copies the file
from TFTP to RAM.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

libfile: implement make_temp ...

Create a make_temp() function which creates a name for a temporary file.
Since we do not have any concurrency in barebox we do not need to create
the file right away and can leave that to the caller. Unlike unix
mktemp the resulting filename is dynamically allocated and must be
freed by the caller.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/misc'

Add support for fastboot sparse images ...

This adds support for reading Android fastboot sparse images. This
code is based on the corresponding U-Boot code, but has been heavily
modified to provide a read-like API which better fits into barebox.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

parseopt: introduce parseopt_u16() and parseopt_str() ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

move parseopt to lib/ ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

lib: parse_area_spec: no extra symbols after area spec are allowed except for spaces ...

Signed-off-by: Peter Mamonov <pmamonov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>