ARM: lib64: Make string functions aware of MMU configuration
...
Optimized version of memset() in memset.S if called as:
memset(foo, 0, size)
will try to explicitly zero out data cache with:
dc zva, dst
which will result in Alignement Exception (DABT) if MMU is not
enabled.
For more info see:
- C4.4.8 "DC ZVA, Data Cache Zero by VA"
- D5.2.8 "The effects of disabling a stage of address translation"
in "ARM Architecture Reference Manual. ARMv8, for ARMv8-A architecture
profile"
In similar vein, using optimized version of memcpy() could lead to a
unaligned 16-byte write (using 'stp'), which is not allowed for
Device-nGnRnE type of memory (see D5.2.8) and would liead to
Alignement Exception.
To fix both problems expose non-optimized and optimzied versions of
the function and created a wrapper to dispatch the call to either one
based on if MMU is enabled or not.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Andrey Smirnov
authored
on 7 Jun 2018
Sascha Hauer
committed
on 11 Jun 2018