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arm64/sme: Drop inaccurate documentation of streaming mode switches

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The SME ABI documentation contains an inaccurate description of the
architectural streaming mode entry/exit behaviour, just remove it since
this is better documented by the architecture or with the rest of the
documentation for the specific software interfaces concerned.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown
2025-07-23 13:27:45 +01:00
committed by Will Deacon
parent 8f5ae30d69
commit 3c0979c644
1 changed files with 2 additions and 12 deletions
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14
Documentation/arch/arm64/sme.rst
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@@ -81,17 +81,7 @@ The ZA matrix is square with each side having as many bytes as a streaming
mode SVE vector.
3. Sharing of streaming and non-streaming mode SVE state
---------------------------------------------------------
It is implementation defined which if any parts of the SVE state are shared
between streaming and non-streaming modes. When switching between modes
via software interfaces such as ptrace if no register content is provided as
part of switching no state will be assumed to be shared and everything will
be zeroed.
4. System call behaviour
3. System call behaviour
-------------------------
* On syscall PSTATE.ZA is preserved, if PSTATE.ZA==1 then the contents of the
@@ -112,7 +102,7 @@ be zeroed.
exceptions for execve() described in section 6.
5. Signal handling
4. Signal handling
-------------------
* Signal handlers are invoked with PSTATE.SM=0, PSTATE.ZA=0, and TPIDR2_EL0=0.