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| author | Will Deacon <will.deacon@arm.com> | 2013-06-12 16:28:04 +0100 |
|---|---|---|
| committer | Ishan Mittal <imittal@nvidia.com> | 2014-04-30 11:39:03 +0530 |
| commit | b05a09e710b9e51ddb88d230ca1cca02484c1034 (patch) | |
| tree | 85349c6893a1933393722ded66db695b6300df35 /arch/arc/mm/fault.c | |
| parent | e02fc30b94bdff4732449806636e31e4f84689ab (diff) | |
arm64: mm: permit use of tagged pointers at EL0
TCR.TBI0 can be used to cause hardware address translation to ignore the
top byte of userspace virtual addresses. Whilst not especially useful in
standard C programs, this can be used by JITs to `tag' pointers with
various pieces of metadata.
This patch enables this bit for AArch64 Linux, and adds a new file to
Documentation/arm64/ which describes some potential caveats when using
tagged virtual addresses.
(cherry picked from commit d50240a5f6ceaf690a77b0fccb17be51cfa151c2)
Conflicts:
Documentation/arm64/tagged-pointers.txt
Change-Id: I4366318cc1b049e8e9f642fc502e8d0b04e2ed24
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arc/mm/fault.c')
0 files changed, 0 insertions, 0 deletions