[PATCH v3 0/3] arm64: Add optimized memset/memcpy/memove functions

[Stefan Roese]

On an NXP LX2160 based platform it has been noticed, that the currently
implemented memset/memcpy functions for aarch64 are suboptimal.
Especially the memset() for clearing the NXP MC firmware memory is very
expensive (time-wise).

By using optimized functions, a speedup of ~ factor 6 has been measured.

This patchset now adds the optimized functions ported from this
repository:
https://github.com/ARM-software/optimized-routines

As the optimized memset function make use of the dc opcode, which needs
the caches to be enabled, an additional check is added and a simple
memset version is used in this case.

Please note that checkpatch.pl complains about some issue with this
imported file: arch/arm/lib/asmdefs.h
Since it's imported I did explicitly not make any changes here, to make
potential future sync'ing easer.

Thanks,
Stefan

Changes in v3:
- Add memmove alias, as this function also handles it optimized
- Add memmove as well

Changes in v2:
- Add file names and locations and git commit ID from imported files
  to the commit message
- New patch

Stefan Roese (3):
  arm64: arch/arm/lib: Add optimized memset/memcpy/memmove functions
  arm64: memset-arm64: Use simple memset when cache is disabled
  arm64: Kconfig: Enable usage of optimized memset/memcpy/memmove

 arch/arm/Kconfig              |  38 +++++-
 arch/arm/include/asm/string.h |   4 +
 arch/arm/lib/Makefile         |   5 +
 arch/arm/lib/asmdefs.h        |  98 ++++++++++++++
 arch/arm/lib/memcpy-arm64.S   | 242 ++++++++++++++++++++++++++++++++++
 arch/arm/lib/memset-arm64.S   | 146 ++++++++++++++++++++
 6 files changed, 527 insertions(+), 6 deletions(-)
 create mode 100644 arch/arm/lib/asmdefs.h
 create mode 100644 arch/arm/lib/memcpy-arm64.S
 create mode 100644 arch/arm/lib/memset-arm64.S

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2.32.0