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| author | Punit Agrawal <punit.agrawal@arm.com> | 2014-11-18 11:41:25 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2014-11-20 16:34:31 +0000 |
| commit | bd35a4adc4131c530ec7d90242555eac7b3dbe3f (patch) | |
| tree | 61db668ee8924e5dae4aa53fadf8b8ffde6bba3b /Documentation/arm64 | |
| parent | 587064b610c703f259317d00dc37bf6d40f4fc74 (diff) | |
| download | lwn-bd35a4adc4131c530ec7d90242555eac7b3dbe3f.tar.gz lwn-bd35a4adc4131c530ec7d90242555eac7b3dbe3f.zip | |
arm64: Port SWP/SWPB emulation support from arm
The SWP instruction was deprecated in the ARMv6 architecture. The
ARMv7 multiprocessing extensions mandate that SWP/SWPB instructions
are treated as undefined from reset, with the ability to enable them
through the System Control Register SW bit. With ARMv8, the option to
enable these instructions through System Control Register was dropped
as well.
To support legacy applications using these instructions, port the
emulation of the SWP and SWPB instructions from the arm port to arm64.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'Documentation/arm64')
| -rw-r--r-- | Documentation/arm64/legacy_instructions.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/arm64/legacy_instructions.txt b/Documentation/arm64/legacy_instructions.txt index 49d4867c0c09..5ab58614b7ed 100644 --- a/Documentation/arm64/legacy_instructions.txt +++ b/Documentation/arm64/legacy_instructions.txt @@ -31,3 +31,10 @@ behaviours and the corresponding values of the sysctl nodes - The default mode depends on the status of the instruction in the architecture. Deprecated instructions should default to emulation while obsolete instructions must be undefined by default. + +Supported legacy instructions +----------------------------- +* SWP{B} +Node: /proc/sys/abi/swp +Status: Obsolete +Default: Undef (0) |