Commit 3c0979c6 authored by Mark Brown's avatar Mark Brown Committed by Will Deacon
Browse files

arm64/sme: Drop inaccurate documentation of streaming mode switches 



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: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 8f5ae30d

Documentation/arch/arm64/sme.rst

+2 −12
Original line number Diff line number Diff line
@@ -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.