linux-toradex.git/arch/mips/lib/memcpy.S, branch v4.1.5

MIPS: lib: memcpy: Add MIPS R6 support

2015-02-17T15:37:29+00:00

MIPS R6 does not support the unaligned load and store instructions
so we add a special MIPS R6 case to copy one byte at a time if we
need to read/write to unaligned memory addresses.

Signed-off-by: Leonid Yegoshin 
Signed-off-by: Markos Chandras

MIPS: lib: memcpy: Restore NOP on delay slot before returning to caller

2014-11-19T17:22:08+00:00

Commit cf62a8b8134dd3 ("MIPS: lib: memcpy: Use macro to build the
copy_user code") switched to a macro in order to build the memcpy
symbols in preparation for the EVA support. However, this commit
also removed the NOP instruction after the 'jr ra' when returning
back to the caller. This had no visible side-effects since the next
instruction was a load to the t0 register which was already in the
clobbered list, but it may have undesired effects in the future
if some other code is introduced in between the .Ldone and
the .Ll_exc_copy labels.

Signed-off-by: Markos Chandras 
Cc:  # v3.15+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8512/
Signed-off-by: Ralf Baechle

MIPS: lib: memcpy: Add EVA support

2014-03-26T22:09:14+00:00

Add copy_{to,from,in}_user when the CPU operates in EVA mode.
This is necessary so the EVA specific instructions can be used
to perform the virtual to physical translation for user space
addresses. We will use the non-EVA functions to read from kernel
if needed.

Signed-off-by: Markos Chandras

MIPS: lib: memcpy: Use macro to build the copy_user code

2014-03-26T22:09:14+00:00

The code can be shared between EVA and non-EVA configurations,
therefore use a macro to build it to avoid code duplications.

Signed-off-by: Markos Chandras

MIPS: lib: memcpy: Split source and destination prefetch macros

2014-03-26T22:09:14+00:00

In preparation for EVA support, the PREF macro is split into two
separate macros, PREFS and PREFD, for source and destination data
prefetching respectively.

Signed-off-by: Markos Chandras

MIPS: lib: memcpy: Merge EXC and load/store macros

2014-03-26T22:09:14+00:00

Each load/store macro always adds an entry to the __ex_table
using the EXC macro. Therefore, these load/store macros are now merged
with the EXC one. The argument list is also expanded in order to make
the macro more flexible. The extra 'type' argument is not used by this
commit, but it will be used when the EVA support is added to the memcpy.

Signed-off-by: Markos Chandras

MIPS: Whitespace cleanup.

2013-02-01T09:00:22+00:00

Having received another series of whitespace patches I decided to do this
once and for all rather than dealing with this kind of patches trickling
in forever.

Signed-off-by: Ralf Baechle

MIPS: Unify memcpy.S and memcpy-inatomic.S

2012-07-23T12:55:55+00:00

We can save the 451 lines of code that comprise memcpy-inatomic.S at the
expense of a single instruction in the memcpy prolog.  We also use an
additional register (t6), so this may cause increased register pressure in
some places as well.  But I think the reduced maintenance burden, of not
having two nearly identical implementations, makes it worth it.

Signed-off-by: David Daney 
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle

MIPS: IP27: Switch from DMA_IP27 to DMA_COHERENT

2009-01-30T21:32:58+00:00

The special IP27 DMA code selected by DMA_IP27 has been removed a while
ago turning DMA_IP27 into almost a nop.  Also fixup the broken logic of
its last users memcpy.S and memcpy-inatomic.s.

Signed-off-by: Ralf Baechle

[MIPS] Eleminate local symbols from the symbol table.

2008-01-29T10:14:59+00:00

These symbols appear in oprofile output, stacktraces and similar but only
make the output harder to read.  Many identical symbol names such as
"both_aligned" were also being used in multiple source files making it
impossible to see which file actually was meant.  So let's get rid of them.

Signed-off-by: Ralf Baechle