environment: bypass overlap check for mtd devices ...

For mtd devices the overlap check does not work as expected for two
reasons. First is that cdev->offset is 0 for mtd partitions, instead
cdev->mtd->master_offset has to be used. That could be fixed easily.
Second on NAND devices the environment is on the bb devices and not
on the raw nand devices which means we would need something to get
the mtd device from the bb device before doing the check.

Both issues are fixable, but the check was mainly done to catch cases
when an environment partition is created in the free space before the
first MBR/GPT partition on SD/MMC devices, so leave out the mtd case
for now.

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

environment: Fix overlapping partitions error message ...

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Fixes: b234a6da331f ("environment: Do not use environment when
                      overlapping with other partitions")
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

environment: Do not use environment when overlapping with other partitions ...

Environment partitions are usually specified with their hardcoded offset
and size, either in the device tree or the board file. These partitions
potentially overlap with other partitions read from the partition table.
Overlapping partitions for sure have bad effects. Be more friendly to our
users and warn them when such a situation occurs and stop using that
partition for storing the environment.

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

Revert "startup: Load default environment earlier" ...

Several boards use defaultenv_append_directory() to append a board
specific envfs snippet during runtime. This only works when
defaultenv_append_directory() is called before defaultenv_load() is
exectuted. Since that was executed at the end of the start process
every initcall level could be used to append a env directory. With this
patch only initcall levels earlier than fsdevice_initcall work and
most boards do not cope with this.

Revert this patch until a better solution is found.

Reported-by: Alexander Kurz <akurz@blala.de>

This reverts commit 5b92cfc.

Merge branch 'for-next/tftp-workaround'

startup: Load default environment earlier ...

Some files compiled into the default environment may be needed earlier in
the boot process, so move loading of the default environment to fs_initcall.
Only the default environment is loaded earlier, but not the overwriting with
the persistent environment files, so when the files are used that early, only
the compiled in version is available; it's not overwritable at that
time.

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

startup: create /tmp ...

Some commands create temporary files in /. Create /tmp to offer
these commands an appropriate place for storing temporary files.

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

include: move shell prototypes to shell.h ...

We have a shell,h, so move shell specific prototypes there.

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

fs: Add pstore filesystem ...

pstore is a persistent storage filesystem used for RAMOOPS. It is used
to store console logs, panics, ftrace and other information in case of a
crash/panic/oops/reboot.

pstore is implemented for barebox as a read-only filesystem at the
moment. It may be extended later on. The idea is to provide a way to
extract essential data from the last running kernel.

Most of the code is copied from the kernel. However this is only a
lightweight implementation without real write support yet.

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

login: rework login mechanism ...

We used to have the login functionality in the /env/bin/init script.
This is hard to review and it's too easy to break the login functionality
with changes to this script. Move the places to ask for a password to
C code where we have only a few places where we have to ask for a password.
Mainly these are run_shell() and the menutree command.

This patch introduces a login() function which will only return if the correct
password has been entered. Following calls will return immediately without
asking for a password again.

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

exitcall: move board_shutdown to exitcall infrastructure ...

Signed-off-by: Herve Codina <Herve.CODINA@celad.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

exitcall: move arch_shutdown to exitcall infrastructure ...

Signed-off-by: Herve Codina <Herve.CODINA@celad.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

exitcall: move device_shutdown to exitcall infrastructure ...

Signed-off-by: Herve Codina <Herve.CODINA@celad.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

exitcall: Add exitcall infrastructure ...

exitcall infrastructure is based on initcall infrastructure.
It allows to have and use exit call hooks on barebox shutdown.

Signed-off-by: Herve Codina <Herve.CODINA@celad.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

startup: introduce postenvironment_initcall ...

To allow init code that depends on the environment being loaded.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

efi: mount efivarfs by default if enabled ...

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

Add support for non volatile variables ...

This adds (back) support for non volatile variables. Non volatile
variables are variables which are stored in the environment over
reboot. They are used in the same way as the global variables, but
with a 'nv' command and device. The variables are stored under
/env/nv/, one variable per file. Adding a nv variable automatically
adds a global variable with the same name. Changing a nv variable
also changes the same global variable, but not the other way round.
This allows for example to configure the username as:

nv user=sha; saveenv

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

environment: Only save changes to the defaultenv ...

Instead of storing the complete files with a 'saveenv' command
only store the files that have changes to the default environment.

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

Merge branch 'for-next/nfs' ...

Conflicts:
	defaultenv/defaultenv-2-base/bin/ifup

run_command: remove unused flag parameter ...

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

defaultenv: Allow multiple defaultenvironment overlays ...

We can compile barebox for multiple boards at once, but currently
they all share a single default environment. This patch adds a
defaultenv_append() which boards can call to customize the default
environment during runtime. Each board now generate default environment
snippets using bbenv-y and add them during runtime with defaultenv_append()

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

defaultenv: Align defaultenv array ...

The default environment buffer is an unsigned char array and thus
may be unaligned. Some decompression algorithms expect the buffer
to be sufficiently aligned for u32 accesses. We make this sure by
copying the default env to a temporary buffer. Instead of doing this
just add a __aligned(4) to the default environment.

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

Kconfig: Select default compression type ...

Instead of asking explicitly for the default environment compression
type ask for the in-barebox default compression type. This also adds
a DEFAULT_COMPRESSION_SUFFIX make variable which can be used together
with the wildcard rules for compressed files to generate compressed
files without explicitly support each compression type.

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

mount: support filesystem options passed via -o ...

Similar to mount(8) the barebox command mount now supports passing a string
to the file system driver via -o.

This is used in the next commit to let the user specify port numbers for
nfs mounts.

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

environment: Use accessor functions for default environment path ...

default_environment_path only exists when CONFIG_ENV_HANDLING is enabled.
Boards would have to #ifdef this if they wanted to use
default_environment_path. Use accessor functions instead which can
be ifdeffed on a single place.

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

treewide: Add missing includes ...

A lot of files rely on include/driver.h including include/of.h (and
this including include/errno.h. include the files explicitly so we can
eventually get rid of including of.h from driver.h

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

Merge branch 'for-next/rs485' ...

Conflicts:
	common/console_common.c

shutdown: add board call back ...

so if we need to do something switch in the board we can fill this function
pointer (as example on Animeo IP shutdown some rs232 & rs485)

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

login: disable input console if password wrong ...

so we guarantee that barebox is secured again user interaction

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

startup: Add initcall tracing debug option ...

Being able to trace initcall is very useful when trying to
find out where startup hangs. This adds a kconfig option for
it to make it easier to access.

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