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manual: Add description of AArch64-specific pkey flags

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Describe AArch64 specific flags PKEY_DISABLE_READ and PKEY_DISABLE_EXECUTE that
are available on AArch64 systems with enabled Stage 1 permission overlays
feature introduced in Armv8.9 / 9.4 (FEAT_S1POE).

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Yury Khrustalev 2024-11-20 11:20:33 +00:00 committed by Wilco Dijkstra
parent f4d00dd60d
commit 47311cca31
1 changed files with 15 additions and 1 deletions
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manual/memory.texi
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@ -3261,6 +3261,12 @@ the page protection flags are applied. Otherwise, @var{access_restrictions} is
a combination of the following flags: a combination of the following flags:
@vtable @code @vtable @code
@item PKEY_DISABLE_READ
@standards{Linux, sys/mman.h}
Subsequent attempts to read from memory with the specified protection
key will fault. At present only AArch64 platforms with enabled Stage 1
permission overlays feature support this type of restriction.
@item PKEY_DISABLE_WRITE @item PKEY_DISABLE_WRITE
@standards{Linux, sys/mman.h} @standards{Linux, sys/mman.h}
Subsequent attempts to write to memory with the specified protection Subsequent attempts to write to memory with the specified protection
@ -3269,7 +3275,15 @@ key will fault.
@item PKEY_DISABLE_ACCESS @item PKEY_DISABLE_ACCESS
@standards{Linux, sys/mman.h} @standards{Linux, sys/mman.h}
Subsequent attempts to write to or read from memory with the specified Subsequent attempts to write to or read from memory with the specified
protection key will fault. protection key will fault. On AArch64 platforms with enabled Stage 1
permission overlays feature this restriction value has the same effect
as combination of @code{PKEY_DISABLE_READ} and @code{PKEY_DISABLE_WRITE}.
@item PKEY_DISABLE_EXECUTE
@standards{Linux, sys/mman.h}
Subsequent attempts to execute from memory with the specified protection
key will fault. At present only AArch64 platforms with enabled Stage 1
permission overlays feature support this type of restriction.
@end vtable @end vtable
Operations not specified as flags are not restricted. In particular, Operations not specified as flags are not restricted. In particular,