The filesystem API often passes in unaligned receive buffers, and some
code (eg BMP reader) processes data in-place, leading to data loss when
we dropped the cache.
(And document exactly what we're doing, so we don't go through this again
at $future_date)
Change-Id: If47a7f2148a5a1a43777f0bd3be1bdfe8239e91e
In fixing the original bug I tried to optimize discard_dcache_range()
to minimize writeback and inadvertently introduced a second bug, which
typically ends in a TLB refill panic.
It occurs only if the range fits within one cache line, and when both
the start and end of the range are not aligned to a cache line. This
causes ptr to be incremented and end to be decremented, so ptr > end,
and the loop can't terminate.
Change-Id: Ibaac072f1369268d3327d534ad08ef9dcee3db65
- The range-based cache operations on MIPS were broken and only worked
properly when BOTH the address and size were multiples of the cache
line size. If this was not the case, the last cache line of the range
would not be touched!
Fix is to align start/end pointers to cache lines before iterating.
- To my knowledge all MIPS processors have a cache, so I enabled
HAVE_CPU_CACHE_ALIGN by default. This also allows mmu-mips.c to use
the CACHEALIGN_UP/DOWN macros.
- Make jz4760/system-target.h define its cache line size properly.
Change-Id: I1fcd04a59791daa233b9699f04d5ac1cc6bacee7
Based on code originally written by Amaury Pouly (g#1789, g#1791, g#1527)
but rebased and heavily updated.
Change-Id: Ic794abb5e8d89feb4b88fc3abe854270fb28db70
Cleaned up, rebased, and forward-ported from the xvortex fork.
(original credit to vsoftster@gmail.com)
Change-Id: Ibcc023a0271ea81e901450a88317708c2683236d
Signed-off-by: Solomon Peachy <pizza@shaftnet.org>
* Add assembly optimised variants for memcpy, memset and find_first_set_bit
* Add option to map_address in MMU to set caching algorithm
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19920 a1c6a512-1295-4272-9138-f99709370657
* Get USB working (it isn't good at writing support though)
* Clean up NAND & SD a bit
* Other comments/fixes
Ingenic Jz4740/MIPS:
* Split MMU from system
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19815 a1c6a512-1295-4272-9138-f99709370657
