2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-12-22 11:13:07 +00:00
Commit graph

2 commits

Author SHA1 Message Date
Stefan Roese
1e43bb6732 arm64: memset-arm64: Use simple memset when cache is disabled
The optimized memset uses the dc opcode, which causes problems when the
cache is disabled. This patch adds a check if the cache is disabled and
uses a very simple memset implementation in this case. Otherwise the
optimized version is used.

Signed-off-by: Stefan Roese <sr@denx.de>
2021-09-24 07:48:06 -04:00
Stefan Roese
dbf6b14e0a arm64: arch/arm/lib: Add optimized memset/memcpy/memmove functions
Ported from https://github.com/ARM-software/optimized-routines

These files are included from this repository, including the latest
git commit ID:
string/aarch64/memcpy.S: afd6244a1f8d
string/aarch64/memset.S: e823e3abf5f8
string/asmdefs.h: e823e3abf5f8

Note that memmove is also handled by the memcpy function.

Please note that when adding these optimized functions as default memset
memcpy functions in U-Boot, U-Boot fails to boot on the LX2160ARDB.
After the initial ATF output, no U-Boot output is shown on the serial
console. Some exception is triggered here in the very early boot process
as some of the assembler opcodes need the caches to be enabled.

Because of this, a follow-up patch will add a check to use a simple
non-optimized memset for the "cache disabled" case.

Note:
I also integrated and tested with the Linux versions of these optimized
functions. They are similar to the ones now integrated but these ARM
versions are still a small bit faster.

Signed-off-by: Stefan Roese <sr@denx.de>
2021-09-24 07:48:06 -04:00