linux-toradex.git/arch/powerpc/kernel/ppc_ksyms.c, branch v3.16-rc7

powerpc: memcpy optimization for 64bit LE

2014-04-30T05:26:18+00:00

Unaligned stores take alignment exceptions on POWER7 running in little-endian.
This is a dumb little-endian base memcpy that prevents unaligned stores.
Once booted the feature fixup code switches over to the VMX copy loops
(which are already endian safe).

The question is what we do before that switch over. The base 64bit
memcpy takes alignment exceptions on POWER7 so we can't use it as is.
Fixing the causes of alignment exception would slow it down, because
we'd need to ensure all loads and stores are aligned either through
rotate tricks or bytewise loads and stores. Either would be bad for
all other 64bit platforms.

[ I simplified the loop a bit - Anton ]

Signed-off-by: Philippe Bergheaud 
Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Export flush_icache_range

2014-04-28T03:08:46+00:00

Commit aac416fc38c (lkdtm: flush icache and report actions) calls
flush_icache_range from a module. It's exported on most architectures
that implement it, but not on powerpc. This patch exports it to fix
the module link failure.

Signed-off-by: Jeff Mahoney 
Signed-off-by: Benjamin Herrenschmidt

Merge branch 'for-kvm' into next

2013-10-11T07:23:53+00:00

Topic branch for commits that the KVM tree might want to pull
in separately.

Hand merged a few files due to conflicts with the LE stuff

Signed-off-by: Benjamin Herrenschmidt

powerpc: Provide for giveup_fpu/altivec to save state in alternate location

2013-10-11T06:26:50+00:00

This provides a facility which is intended for use by KVM, where the
contents of the FP/VSX and VMX (Altivec) registers can be saved away
to somewhere other than the thread_struct when kernel code wants to
use floating point or VMX instructions.  This is done by providing a
pointer in the thread_struct to indicate where the state should be
saved to.  The giveup_fpu() and giveup_altivec() functions test these
pointers and save state to the indicated location if they are non-NULL.
Note that the MSR_FP/VEC bits in task->thread.regs->msr are still used
to indicate whether the CPU register state is live, even when an
alternate save location is being used.

This also provides load_fp_state() and load_vr_state() functions, which
load up FP/VSX and VMX state from memory into the CPU registers, and
corresponding store_fp_state() and store_vr_state() functions, which
store FP/VSX and VMX state into memory from the CPU registers.

Signed-off-by: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Added __cmpdi2 for signed 64bit comparision

2013-10-11T05:49:27+00:00

This was missing on powerpc and I am getting compilation error
drivers/vfio/pci/vfio_pci_rdwr.c:193: undefined reference to `__cmpdi2'
drivers/vfio/pci/vfio_pci_rdwr.c:193: undefined reference to `__cmpdi2'

Signed-off-by: Bharat Bhushan 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Use generic memcpy code in little endian

2013-10-11T05:48:40+00:00

We need to fix some endian issues in our memcpy code. For now
just enable the generic memcpy routine for little endian builds.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Use generic checksum code in little endian

2013-10-11T05:48:39+00:00

We need to fix some endian issues in our checksum code. For now
just enable the generic checksum routines for little endian builds.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Remove the empty giveup_fpu() function on 32bit kernel

2013-08-14T04:59:50+00:00

Instead of implementing an empty giveup_fpu() function for each
32bit processor type, replace them with an unique empty inline
function.

Signed-off-by: Kevin Hao 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Remove the symbol __flush_icache_range

2013-08-14T04:56:44+00:00

And now the function flush_icache_range() is just a wrapper which
only invoke the function __flush_icache_range() directly. So we
don't have reason to keep it anymore.

Signed-off-by: Kevin Hao 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Provide __bswapdi2

2013-05-14T06:00:17+00:00

Some versions of GCC apparently expect this to be provided by libgcc.

Updates from Mikey to fix 32 bit version and adding "r" to registers.

Signed-off-by: David Woodhouse 
Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt