MIPS: relocation: add relocation support ...

this patch i a port of following patch from u-boot with some additional
integration changes and fixes of original code:
| Subject: [PATCH] MIPS: Stop building position independent code
|
| U-Boot has up until now built with -fpic for the MIPS architecture,
| producing position independent code which uses indirection through a
| global offset table, making relocation fairly straightforward as it
| simply involves patching up GOT entries.
|
| Using -fpic does however have some downsides. The biggest of these is
| that generated code is bloated in various ways. For example, function
| calls are indirected through the GOT & the t9 register:
|
|   8f998064   lw     t9,-32668(gp)
|   0320f809   jalr   t9
|
| Without -fpic the call is simply:
|
|   0f803f01   jal    be00fc04 <puts>
|
| This is more compact & faster (due to the lack of the load & the
| dependency the jump has on its result). It is also easier to read &
| debug because the disassembly shows what function is being called,
| rather than just an offset from gp which would then have to be looked up
| in the ELF to discover the target function.
|
| Another disadvantage of -fpic is that each function begins with a
| sequence to calculate the value of the gp register, for example:
|
|   3c1c0004   lui    gp,0x4
|   279c3384   addiu  gp,gp,13188
|   0399e021   addu   gp,gp,t9
|
| Without using -fpic this sequence no longer appears at the start of each
| function, reducing code size considerably.
|
| This patch switches U-Boot from building with -fpic to building with
| -fno-pic, in order to gain the benefits described above. The cost of
| this is an extra step during the build process to extract relocation
| data from the ELF & write it into a new .rel section in a compact
| format, plus the added complexity of dealing with multiple types of
| relocation rather than the single type that applied to the GOT. The
| benefit is smaller, cleaner, more debuggable code. The relocate_code()
| function is reimplemented in C to handle the new relocation scheme,
| which also makes it easier to read & debug.
|
| Taking maltael_defconfig as an example the size of u-boot.bin built
| using the Codescape MIPS 2016.05-06 toolchain (gcc 4.9.2, binutils
| 2.24.90) shrinks from 254KiB to 224KiB.
|
| Signed-off-by: Paul Burton <paul.burton@imgtec.com>

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

MIPS: migrate all files to SPDX ...

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Reviewed-by: Roland Hieber <r.hieber@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

MIPS: fix PCI quirk infrastructure build ...

The commit fc2c618c2038 ("pci: add quirk infrastructure")
adds necessary ld-script changes only for ARM architecture.
As a result, qemu-malta build fails:

     LD      barebox
    drivers/built-in.o: In function `pci_fixup_device':
    (.text.pci_fixup_device+0x30): undefined reference to `__end_pci_fixups_enable'
    (.text.pci_fixup_device+0x38): undefined reference to `__end_pci_fixups_enable'
    (.text.pci_fixup_device+0x34): undefined reference to `__start_pci_fixups_enable'
    (.text.pci_fixup_device+0x3c): undefined reference to `__start_pci_fixups_enable'
    (.text.pci_fixup_device+0x70): undefined reference to `__end_pci_fixups_header'
    (.text.pci_fixup_device+0x78): undefined reference to `__end_pci_fixups_header'
    (.text.pci_fixup_device+0x74): undefined reference to `__start_pci_fixups_header'
    (.text.pci_fixup_device+0x80): undefined reference to `__start_pci_fixups_header'
    (.text.pci_fixup_device+0x2c): undefined reference to `__end_pci_fixups_early'
    (.text.pci_fixup_device+0x88): undefined reference to `__end_pci_fixups_early'
    (.text.pci_fixup_device+0x84): undefined reference to `__start_pci_fixups_early'
    (.text.pci_fixup_device+0x90): undefined reference to `__start_pci_fixups_early'
    make: *** [Makefile:767: barebox] Error 1

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

ratp: implement generic command support ...

The RATP implementation now allows executing generic commands with a
binary interface: binary requests are received and binary responses
are returned.

Each command can define its own RATP request contents (e.g. to specify
command-specific options) as well as its own RATP response contents
(if any data is to be returned).

Each command is associated with a pair of numeric unique request and
response IDs, and for easy reference these IDs are maintained in the
common ratp_bb header. Modules may override generic implemented
commands or include their own new ones (as long as the numeric IDs
introduced are unique).

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

MIPS: barebox.lds.S: put .text_entry contents after _stext and _text ...

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

MIPS: barebox.lds.S: remove unused got ...

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

MIPS: barebox.lds.S: drop unneeded '_start = .' ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.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>

MIPS: add support for metadata in barebox images ...

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

MIPS: lib: add BAREBOX_CLK_TABLE to linker script ...

This commit is based on
    commit fa1a406
    Author: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
    Date:   Sat Nov 9 14:24:18 2013 +0100

        ARM: lib: add BAREBOX_CLK_TABLE to linker script

        This adds an .oftables section right before .dtb section with
        BAREBOX_CLK_TABLE to ARM linker script.

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

MIPS: add initial device tree support ...

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

barebox-data: add barebox-data sections ...

Add barebox-data section in arm branch to get complete
barebox regions in sdram regions tree.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Treewide: remove address of the Free Software Foundation ...

The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.

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

introduce barebox_bare_init_size to known the bare_init size and check it ...

this allow to check we do not exceed the size of the SRAM as example

introduce BAREBOX_MAX_BARE_INIT_SIZE the maximum size of bare_init
this will allow your bare_init will fit in SRAM as example
ARCH can overwrite it via ARCH_BAREBOX_MAX_BARE_INIT_SIZE

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

Merge branch 'next'

MIPS: provide __bss_stop in linker script ...

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

add magicvar command ...

The magicvar command gives an overview about all environment variables
with a special meaning.

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

remove EARLY_INIT and EARLY_CONSOLE support ...

Bitrotted over time and nearly unused, so remove it.

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

MIPS: add common MIPS stuff ...

Add start.S, CP0 clocksource, Makefile, linker script and memory
layout function.

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