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>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/string.h b/include/string.h
index 0c557d6f15..6ceb33224e 100644
--- a/include/string.h
+++ b/include/string.h
@@ -6,4 +6,7 @@
 void *memdup(const void *, size_t);
 int strtobool(const char *str, int *val);
 
+void *__default_memset(void *, int, __kernel_size_t);
+void *__default_memcpy(void * dest,const void *src,size_t count);
+
 #endif /* __STRING_H */