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  1. 21 Apr, 2016 6 commits
  3. 18 Feb, 2016 1 commit
    • Sandrine Bailleux's avatar
      Cortex-A57: Add link to software optimization guide · d1b2b203
      Sandrine Bailleux authored 
      This patch adds a link to the Cortex-A57 Software Optimization Guide
in the ARM CPU Specific Build Macros document to justify the default
value of the A57_DISABLE_NON_TEMPORAL_HINT build flag.

Change-Id: I9779e42a4bb118442b2b64717ce143314ec9dd16
      d1b2b203
  5. 08 Feb, 2016 1 commit
    • Sandrine Bailleux's avatar
      Disable non-temporal hint on Cortex-A53/57 · 54035fc4
      Sandrine Bailleux authored 
      The LDNP/STNP instructions as implemented on Cortex-A53 and
Cortex-A57 do not behave in a way most programmers expect, and will
most probably result in a significant speed degradation to any code
that employs them. The ARMv8-A architecture (see Document ARM DDI
0487A.h, section D3.4.3) allows cores to ignore the non-temporal hint
and treat LDNP/STNP as LDP/STP instead.

This patch introduces 2 new build flags:
A53_DISABLE_NON_TEMPORAL_HINT and A57_DISABLE_NON_TEMPORAL_HINT
to enforce this behaviour on Cortex-A53 and Cortex-A57. They are
enabled by default.

The string printed in debug builds when a specific CPU errata
workaround is compiled in but skipped at runtime has been
generalised, so that it can be reused for the non-temporal hint use
case as well.

Change-Id: I3e354f4797fd5d3959872a678e160322b13867a1
      54035fc4
  7. 05 Aug, 2015 1 commit
  9. 02 Feb, 2015 1 commit
  11. 07 Jan, 2015 1 commit
  13. 29 Oct, 2014 2 commits
    • Soby Mathew's avatar
      Optimize Cortex-A57 cluster power down sequence on Juno · 5541bb3f
      Soby Mathew authored 
      This patch optimizes the Cortex-A57 cluster power down sequence by not
flushing the Level1 data cache. The L1 data cache and the L2 unified
cache are inclusive. A flush of the L2 by set/way flushes any dirty
lines from the L1 as well. This is a known safe deviation from the
Cortex-A57 TRM defined power down sequence. This optimization can be
enabled by the platform through the 'SKIP_A57_L1_FLUSH_PWR_DWN' build
flag. Each Cortex-A57 based platform must make its own decision on
whether to use the optimization.

This patch also renames the cpu-errata-workarounds.md to
cpu-specific-build-macros.md as this facilitates documentation
of both CPU Specific errata and CPU Specific Optimization
build macros.

Change-Id: I299b9fe79e9a7e08e8a0dffb7d345f9a00a71480
      5541bb3f
    • Soby Mathew's avatar
      Apply errata workarounds only when major/minor revisions match. · 7395a725
      Soby Mathew authored 
      Prior to this patch, the errata workarounds were applied for any version
of the CPU in the release build and in the debug build an assert
failure resulted when the revision did not match. This patch applies
errata workarounds in the Cortex-A57 reset handler only if the 'variant'
and 'revision' fields read from the MIDR_EL1 match. In the debug build,
a warning message is printed for each errata workaround which is not
applied.

The patch modifies the register usage in 'reset_handler` so
as to adhere to ARM procedure calling standards.

Fixes ARM-software/tf-issues#242

Change-Id: I51b1f876474599db885afa03346e38a476f84c29
      7395a725
  15. 27 Aug, 2014 1 commit
  17. 20 Aug, 2014 1 commit