Commit graph

67563 commits

Author SHA1 Message Date
Simon Glass
3a5752ccff x86: mp_init: Switch parameter names in start_aps()
These parameters are named differently from elsewhere in this file. Switch
them to avoid confusion.

Also add comments to this function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
2020-07-20 09:46:43 +08:00
Simon Glass
e624858407 x86: mp_init: Avoid declarations in header files
The functions used by the flight plan are declared in the header file but
are not used in any other file.

Move the flight plan steps down to just above where it is used so that we
can make these function static.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-07-20 09:46:43 +08:00
Simon Glass
78d57d63d7 x86: Move MP code into mp_init
At present the 'flight plan' for CPUs is passed into mp_init. But it is
always the same. Move it into the mp_init file so everything is in one
place. Also drop the SMI function since it does nothing. If we implement
SMIs, more refactoring will be needed anyway.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-07-20 09:46:42 +08:00
Simon Glass
cb1cb7146f x86: mp_init: Switch to livetree
Update this code to use livetree calls instead of flat-tree.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-07-20 09:46:42 +08:00
Simon Glass
d2ee543ae2 dm: core: Don't show an ACPI warning if there is no ordering
Some boards don't care about the ordering of ACPI code fragments. Change
the warning to a debug message.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
2020-07-20 09:46:42 +08:00
Tom Rini
49cf75101d - MIPS: refactor cache init and setup in start.S
- MIPS: sync asm header files with Linux 5.7
 - MIPS: add initial support for Marvell Octeon MIPS64
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Merge tag 'mips-pull-2020-07-18' of https://gitlab.denx.de/u-boot/custodians/u-boot-mips

- MIPS: refactor cache init and setup in start.S
- MIPS: sync asm header files with Linux 5.7
- MIPS: add initial support for Marvell Octeon MIPS64
2020-07-18 11:34:49 -04:00
Stefan Roese
5fef24c912 mips: octeon: Add minimal Octeon 3 EBB7304 EVK support
This patch adds very basic minimal support for the Marvell Octeon 3
CN73xx based EBB7304 EVK. Please note that the basic Octeon port does
not support DDR3/4 initialization yet. To still use U-Boot on with this
port, the L2 cache (4MiB) is used as RAM. This way, U-Boot can boot
to the prompt on this board.

Supported devices:
- UART
- reset
- CFI parallel NOR flash

Signed-off-by: Stefan Roese <sr@denx.de>
2020-07-18 15:47:50 +02:00
Stefan Roese
e9609dc38b mips: octeon: use mips_mach_early_init() to copy to L2 cache
This patch adds the code to copy itself from bootrom location to a
different location (TEXT_BASE) to the Octeon platform. Its used in
this case to copy the complete U-Boot image into L2 cache, which
greatly improves the bootup time - especially in regard to the
very long and complex DDR4 init code.

The Kconfig symbol CONFIG_MIPS_MACH_EARLY_INIT is enabled with this
patch for Octeon.

Signed-off-by: Stefan Roese <sr@denx.de>
2020-07-18 15:47:50 +02:00
Stefan Roese
ff7e4f030b mips: octeon: dts: Add Octeon 3 cn73xx base dtsi file
This patch adds the base dtsi file for the Octeon 3 cn73xx SoC.

Signed-off-by: Stefan Roese <sr@denx.de>
2020-07-18 15:47:50 +02:00
Aaron Williams
0dc4ab9c43 mips: octeon: Initial minimal support for the Marvell Octeon SoC
This patch adds very basic support for the Octeon III SoCs. Only
CFI parallel NOR flash and UART is supported for now.

Please note that the basic Octeon port does not include the DDR3/4
initialization yet. This will be added in some follow-up patches
later. To still use U-Boot on with this port, the L2 cache (4MiB on
Octeon III CN73xx) is used as RAM. This way, U-Boot can boot to the
prompt on such boards.

Signed-off-by: Aaron Williams <awilliams@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
2020-07-18 15:47:50 +02:00
Stefan Roese
59aea37abf sysreset: Add Octeon sysreset driver
This patch adds a UCLASS_SYSRESET sysreset driver for the Octeon SoC
family.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2020-07-18 14:23:25 +02:00
Stefan Roese
de34a61642 mips: Add CONFIG_MIPS_MACH_EARLY_INIT for very early mach init code
This patch adds the optional call to mips_mach_early_init() to start.S
at a very early stage. Its disabled per default. It can be used for
very early machine / platform specific init code.  Its called very
early and at this stage the PC is allowed to differ from the linking
address (CONFIG_TEXT_BASE) as no absolute jump has been performed until
this call.

It will be used by thje Octeon platform.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2020-07-18 14:23:25 +02:00
Daniel Schwierzeck
81d4b14f7e mips: sync asm/mipsregs.h with Linux 5.7
Sync asm/mipsregs.h with Linux 5.7. Also replace the custom
symbols EBASE_CPUNUM and EBASE_WG with the according symbols
from Linux.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Daniel Schwierzeck
c0f99579fa mips: sync asm/addrspace.h with Linux 5.7
Sync asm/addrspace.h with Linux 5.7

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Daniel Schwierzeck
eac800043f mips: sync asm/asm.h with Linux 5.7
Sync asm/asm.h with Linux 5.7.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Daniel Schwierzeck
dd1bb42305 mips: remove deprecated UNCACHED_SDRAM() macro
This macro only served as a wrapper for CKSEG1ADDR() with an
exception for CONFIG_TB0229. CONFIG_TB0229 doesn't exist, thus
use CKSEG1ADDR() directly.

This also prepares for an upcoming asm header sync with Linux.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Daniel Schwierzeck
57bfb1aed6 mips: add config options for generic cache setup code
Add an own Kconfig symbol for the initial disabling of caches
invoked from generic start code.

Also add an own Kconfig symbols for the initialization of caches
invoked from generic start code.

Until now both code paths could only be disabled with
CONFIG_SKIP_LOWLEVEL_INIT. But this is not flexible enough for
RAM boot scenarios like EJTAG or SPL payload or for machines
which don't require cache initialization or which want to
provide their own cache implementation.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Daniel Schwierzeck
60772433dd mips: refactor disabling of caches
Logically this code belongs to cache_init.S.

If a complex SoC needs to replace the generic cache init,
mips_cache_disable() can now be called from custom start.S files.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Daniel Schwierzeck
b55e07e565 mips: add KSEG1 wrapper for change_k0_cca
change_k0_cca() is called multiple times. Move the code for
changing to KSEG1 to a macro to avoid code duplication.

Also fix missing change to KSEG1 when changing to CONF_CM_CACHABLE_COW.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Daniel Schwierzeck
54e7fbd5ad mips: start.S: remove dead code
Since commit 703ec9ddf9 ("MIPS: Stop building position independent code")
the relocation code was completely reworked and removed from start.S.
Remove some left-overs of the old code.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Stefan Roese
60a0559b7f mips: cache: Make invalidate_dcache_range() weak to enable overwrite
This patch adds __weak to invalidate_dcache_range() in lib/cache.c. This
makes it possible to overwrite this function by a platforms specific
version, which will be done for Octeon.

Signed-off-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Stefan Roese
1d4ba15c6f mips: cache: Make flush_cache() weak to enable overwrite
This patch adds __weak to flush_cache() in lib/cache.c. This makes it
possible to overwrite this function by a platforms specific version,
like done with the Octeon base port.

Signed-off-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Stefan Roese
2eed3dca22 mips: cache: Allow using CONFIG_MIPS_L2_CACHE without CONFIG_MIPS_CM
This patch enables the usage of CONFIG_MIPS_L2_CACHE without
CONFIG_MIPS_CM, which is what is needed for the newly added Octeon
platform.

Signed-off-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Stefan Roese
c372813105 mips: reloc: Change R_MIPS_NONE to catch pre-reloc BSS usage
This patch changes the R_MIPS_NONE define from 0 to a magic value. This
makes it possible to better detect any forbidden pre-relocation usage
of BSS variables, as they are often zero'ed and then relocation is
stopped too early.

Additionally the error message is improved to also print the faulting
address. This helps finding the root-cause for this breakage by
comparing this address with the values in System.map.

This patch helps a lot when working on pre-relocation code, like the
Octeon DDR init code, where such variables have hit me multiple times
now.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Aaron Williams <awilliams@marvell.com>
Cc: Chandrakala Chavva <cchavva@marvell.com>
2020-07-18 14:23:25 +02:00
Stefan Roese
a02bc1f992 mips: traps: Set WG bit in EBase register on Octeon
WG (bit 11) needs to be set on Octeon to enable writing bits 63:30 of
the exception base register.

Signed-off-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:25 +02:00
Stefan Roese
a414281da4 mips: time: Only compile the weak get_tbclk() when needed
This patch opts-out the compilation of get_tbclk() if
CONFIG_SYS_MIPS_TIMER_FREQ is not defined. This is used on the Octeon
platform, where the weak get_tbclk() function is overwritten by its
platform specific one.

Signed-off-by: Stefan Roese <sr@denx.de>
2020-07-18 14:23:24 +02:00
Tom Rini
1c4b5038af Merge branch '2020-07-17-misc-fixes'
A large number of assorted fixes, including but not limited to:
- Correct fixdep and CONFIG_IS_ENABLED(...)
- lz4 on big endian
- Assorted LMB hardening
- Remove bd_t typedef
2020-07-17 16:08:54 -04:00
Suneel Garapati
21fc5a1685 include: pci_ids: Add Cavium devices
Add VendorID and DeviceID for supported devices on OcteonTX/TX2
platforms.

Signed-off-by: Suneel Garapati <sgarapati@marvell.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2020-07-17 10:47:19 -04:00
Michal Simek
4d288dcd4c doc: fit: Write hex address as hex instead of int
When update_uboot.its is used directly there is syntax error for no reason.

Error report:
mkimage -f update_uboot.its boot
Error: update_uboot.its:18.12-13 syntax error
FATAL ERROR: Unable to parse input tree
mkimage: Can't read boot.tmp: Invalid argument

Fixes: 4bae90904b ("Automatic software update from TFTP server")
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2020-07-17 10:47:19 -04:00
Martin Kaistra
892d461735 mtd: mtdpart: use uint64_t instead of int for cur_off
The types of "offset" and "size" of "struct mtd_partition" are uint64_t,
while mtd_parse_partitions() uses int to work with these values. When
the offset reaches 2GB, it is interpreted as a negative value, which
leads to error messages like

mtd: partition "<partition name>" is out of reach -- disabled

eg. when using the "ubi part" command.

Fix this by using uint64_t for cur_off and cur_sz.

Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
2020-07-17 10:47:19 -04:00
Holger Brunck
b72bbf575b board/km: update MAINTAINERS email
Signed-off-by: Holger Brunck <holger.brunck@hitachi-powergrids.com>
CC: Valentin Longchamp <valentin.longchamp@hitachi-powergrids.com>
2020-07-17 10:47:19 -04:00
Heinrich Schuchardt
dd43272be1 doc: correct description of crash dumps
Correct the description of the ESR register.

Fix a typo.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
2020-07-17 10:47:19 -04:00
Stephen Warren
76ae74d348 fixdep: fix CONFIG_IS_ENABLED etc. handling
When fixdep detects CONFIG_IS_ENABLED and other similar macros, it must
parse the macro parameter to determine which actual CONFIG_ option is
being referenced. This involves moving a pointer forward through the
entire CONFIG_ option "word". Currently, the code uses variable q to walk
through the word, but doesn't actually initialize it to point at the
parameter before doing so. Consequently, the walking process immediately
fails since it sees the macro invocatoins's ( rather than the expected
alpha-numeric characters in the macro parameter. Fix this by adding the
missing initialization.

Fixes: 67f2ee86cc ("kbuild: fixdep: Resync this with v4.17")
Fixes: 7012865e96 ("gpio: fix test.py for gpio label lookup")
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2020-07-17 10:47:19 -04:00
Mylène Josserand
dd85dc55eb mkimage: Fix error message if write less data then expected
Add a new error message in case the size of data written
are shorter than the one expected.

Currently, it will lead to the following error message:

"mkimage: Write error on uImage: Success"

This is not explicit when the error is because the device
doesn't have enough space. Let's use a more understandable message:

"mkimage: Write only 4202432/4682240 bytes, probably no space left on the device"

Signed-off-by: Mylène Josserand <mylene.josserand@collabora.com>
Reviewed-by: Walter Lozano <walter.lozano@collabora.com>
2020-07-17 10:47:19 -04:00
Rasmus Villemoes
5c6a4d5a27 remove include/config_defaults.h
Since commit 4b0bcfa7c4 (Kconfig: Migrate CONFIG_BOOTM_* options),
the config_defaults.h file has been void of any actual content - and
these days, "sane defaults for everyone" is achieved by appropriate
default values in Kconfig. Remove it, and thus make every translation
unit process one less header file.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
2020-07-17 10:47:19 -04:00
Fabio Estevam
eeda3d7497 doc: multi-dtb-fit: Remove double underscores
Remove the incorrect usage of double underscores for the
CONFIG_OF_LIST and CONFIG_SPL_OF_LIST symbols.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
2020-07-17 10:47:19 -04:00
Heinrich Schuchardt
1244f36900 fs: error handling in do_load()
If a file cannot be loaded, show an error message.
Set the EFI boot device only after successfully loading a file.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
2020-07-17 10:47:19 -04:00
Masahiro Yamada
36da57aa87 asm/u-boot.h: remove bd_t definitions
All the users of bd_t were converted to struct bd_info.

Remove the definitions.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-07-17 10:47:19 -04:00
Masahiro Yamada
bb5a2cf9f9 treewide: convert bd_t to struct bd_info manually
Some code was not converted by coccinelle, somehow.

I manually fixed up the remaining, and comments, README docs.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
[trini: Add arch/arm/mach-davinci/include/mach/sdmmc_defs.h and
        include/fdt_support.h]
Signed-off-by: Tom Rini <trini@konsulko.com>
2020-07-17 10:46:44 -04:00
Masahiro Yamada
b75d8dc564 treewide: convert bd_t to struct bd_info by coccinelle
The Linux coding style guide (Documentation/process/coding-style.rst)
clearly says:

  It's a **mistake** to use typedef for structures and pointers.

Besides, using typedef for structures is annoying when you try to make
headers self-contained.

Let's say you have the following function declaration in a header:

  void foo(bd_t *bd);

This is not self-contained since bd_t is not defined.

To tell the compiler what 'bd_t' is, you need to include <asm/u-boot.h>

  #include <asm/u-boot.h>
  void foo(bd_t *bd);

Then, the include direcective pulls in more bloat needlessly.

If you use 'struct bd_info' instead, it is enough to put a forward
declaration as follows:

  struct bd_info;
  void foo(struct bd_info *bd);

Right, typedef'ing bd_t is a mistake.

I used coccinelle to generate this commit.

The semantic patch that makes this change is as follows:

  <smpl>
  @@
  typedef bd_t;
  @@
  -bd_t
  +struct bd_info
  </smpl>

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-07-17 09:30:13 -04:00
Michal Simek
02ff91e8c6 arm64: Remove CONFIG_SYS_FULL_VA macro
All configurations have been removed in 2016 by commit 7985cdf74b
("arm64: Remove non-full-va map code").

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2020-07-17 09:30:13 -04:00
Jan Kiszka
7125d2c195 Makefile: Silence relocate-rela call
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
2020-07-17 09:30:13 -04:00
Chin Liang See
499b7493e7 lib: zlib: Remove offset pointer optimization in inftrees.c
This fixes the CVE-2016-9840. Commit imported from [1].

inftrees.c was subtracting an offset from a pointer to an array,
in order to provide a pointer that allowed indexing starting at
the offset. This is not compliant with the C standard, for which
the behavior of a pointer decremented before its allocated memory
is undefined. Per the recommendation of a security audit of the
zlib code by Trail of Bits and TrustInSoft, in support of the
Mozilla Foundation, this tiny optimization was removed, in order
to avoid the possibility of undefined behavior.

[1]: 6a043145ca

Signed-off-by: Mark Adler <madler@alumni.caltech.edu>
Signed-off-by: Chin Liang See <chin.liang.see@intel.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
2020-07-17 08:51:29 -04:00
Patrick Delaunay
b4d14bc81a Convert CONFIG_ARMV7_PSCI_1_0 and CONFIG_ARMV7_PSCI_0_2 to Kconfig
This converts the following to Kconfig:
CONFIG_ARMV7_PSCI_1_0
CONFIG_ARMV7_PSCI_0_2

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
2020-07-17 08:51:29 -04:00
Thomas Schaefer
ea5003ad66 spl: fix ext4fs_mount return code handling
- Despite other ext4 filesystem functions, ext4fs_mount returns
  0 in case of error.
- This leads to u-boot crash in case that an SD card
  with valid partition table but without ext4 filesystem created
  in a partition is found on SD card.
- Fix this by returning a proper error code of '-1' from spl_load_image_ext
  function in case of ext4fs_mount error.

Signed-off-by: Thomas Schaefer <thomas.schaefer@kontron.com>
[hthiery: slightly reword the commit message]
Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2020-07-17 08:51:01 -04:00
Tero Kristo
9b83f9c594 cmd: booti: convert the debug print about image move to printf
Moving of the OS image may have some nasty side effects like corrupting
DTB. Convert the current debug print to printf so that the relocation of
the OS is always obvious to the user.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
2020-07-17 08:51:01 -04:00
Tero Kristo
fbde7589ce common: bootm: add checks to verify if ramdisk / fdtimage overlaps OS image
These cases are typically fatal and are difficult to debug for random
users. Add checks for detecting overlapping images and abort if overlap
is detected.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
2020-07-17 08:51:01 -04:00
Tero Kristo
19c6808d87 image: fdt: bail out with error if no boot time FDT image found
Currently the boot continues if the FDT image is clearly corrupted,
which just causes the loaded OS to hang. Abort boot properly if the FDT
is corrupted.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
2020-07-17 08:51:01 -04:00
Tom Rini
e6676a34c4 Convert CONFIG_MXC_UART to Kconfig
This converts the following to Kconfig:
   CONFIG_MXC_UART

Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
2020-07-17 08:47:29 -04:00
Rasmus Villemoes
e7885a48bb lz4: fix decompressor on big-endian powerpc
Booting an lz4-compressed kernel image fails on our powerpc board with
-EPROTONOSUPPORT. Adding a bit of debug prints, we get

  magic: 0x184d2204
  flags: 0x64
  reserved0: 1
  has_content_checksum: 1
  has_content_size: 0
  has_block_checksum: 0
  independent_blocks: 1
  version: 0
  block_descriptor: 70
  reserved1: 7
  max_block_size: 0
  reserved2: 0

So the magic is ok, but the version check fails, also some reserved
bits are apparently set. But that's because the code interprets the
"flags" and "block_descriptor" bytes wrongly:

Using bit-fields to access individual bits of an "on the wire" format
is not portable, not even when restricted to the C flavour implemented
by gcc. Quoting the gcc manual:

   * 'The order of allocation of bit-fields within a unit (C90 6.5.2.1,
     C99 and C11 6.7.2.1).'

     Determined by ABI.

and indeed, the PPC Processor ABI supplement says

   * Bit-fields are allocated from right to left (least to most
     significant) on Little-Endian implementations and from left to
     right (most to least significant) on Big-Endian implementations.

The upstream code (github.com/lz4/lz4) uses explicit shifts and masks
for encoding/decoding:

    /* FLG Byte */
    *dstPtr++ = (BYTE)(((1 & _2BITS) << 6)    /* Version('01') */
        + ((cctxPtr->prefs.frameInfo.blockMode & _1BIT ) << 5)
        + ((cctxPtr->prefs.frameInfo.blockChecksumFlag & _1BIT ) << 4)
        + ((unsigned)(cctxPtr->prefs.frameInfo.contentSize > 0) << 3)
        + ((cctxPtr->prefs.frameInfo.contentChecksumFlag & _1BIT ) << 2)
        +  (cctxPtr->prefs.frameInfo.dictID > 0) );

    /* Flags */
    {   U32 const FLG = srcPtr[4];
        U32 const version = (FLG>>6) & _2BITS;
        blockChecksumFlag = (FLG>>4) & _1BIT;
        blockMode = (FLG>>5) & _1BIT;
        contentSizeFlag = (FLG>>3) & _1BIT;
        contentChecksumFlag = (FLG>>2) & _1BIT;
        dictIDFlag = FLG & _1BIT;
        /* validate */
        if (((FLG>>1)&_1BIT) != 0) return err0r(LZ4F_ERROR_reservedFlag_set); /* Reserved bit */
        if (version != 1) return err0r(LZ4F_ERROR_headerVersion_wrong);        /* Version Number, only supported value */
    }

Do the same here, and while at it, be more careful to use unaligned
accessors to what is most likely unaligned. Also update the comment to
make it clear that it only refers to the lz4.c file, not the following
code of lz4_wrapper.c.

This has been tested partly, of course, by seeing that my
lz4-compressed kernel now boots, partly by running the (de)compression
test-suite in the (x86_64) sandbox - i.e., it should still work just
fine on little-endian hosts.

Reviewed-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
2020-07-17 08:45:29 -04:00