linux.git/arch/powerpc/kernel/head_64.S, branch v4.4.24

powerpc/book3e: support CONFIG_RELOCATABLE

2015-10-27T23:13:27+00:00

book3e is different with book3s since 3s includes the exception
vectors code in head_64.S as it relies on absolute addressing
which is only possible within this compilation unit. So we have
to get that label address with got.

And when boot a relocated kernel, we should reset ipvr properly again
after .relocate.

Signed-off-by: Tiejun Chen 
[scottwood: cleanup and ifdef removal]
Signed-off-by: Scott Wood

powerpc/booke64: Fix args to copy_and_flush

2015-10-27T23:13:26+00:00

Convert r4/r5, not r6, to a virtual address when calling
copy_and_flush.  Otherwise, r3 is already virtual, and copy_to_flush
tries to access r3+r6, PAGE_OFFSET gets added twice.

This isn't normally seen because on book3e we normally enter with
the kernel at zero and thus skip copy_to_flush -- but it will be
needed for kexec support.

Signed-off-by: Tiejun Chen 
[scottwood: split patch and rewrote changelog]
Signed-off-by: Scott Wood

powerpc/e6500: kexec: Handle hardware threads

2015-10-27T23:13:25+00:00

The new kernel will be expecting secondary threads to be disabled,
not spinning.

Signed-off-by: Scott Wood

Merge remote-tracking branch 'scott/next' into next

2014-08-05T04:13:41+00:00

Scott writes:

Highlights include e6500 hardware threading support, an e6500 TLB erratum
workaround, corenet error reporting, support for a new board, and some
minor fixes.

powerpc/e6500: Add support for hardware threads

2014-07-30T00:26:20+00:00

The general idea is that each core will release all of its
threads into the secondary thread startup code, which will
eventually wait in the secondary core holding area, for the
appropriate bit in the PACA to be set. The kick_cpu function
pointer will set that bit in the PACA, and thus "release"
the core/thread to boot. We also need to do a few things that
U-Boot normally does for CPUs (like enable branch prediction).

Signed-off-by: Andy Fleming 
[scottwood@freescale.com: various changes, including only enabling
 threads if Linux wants to kick them]
Signed-off-by: Scott Wood

powerpc: Remove STAB code

2014-07-28T04:10:22+00:00

Old cpus didn't have a Segment Lookaside Buffer (SLB), instead they had
a Segment Table (STAB). Now that we've dropped support for those cpus,
we can remove the STAB support entirely.

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix SMP issues with ppc64le ABIv2

2014-04-23T00:05:26+00:00

There is no need to put a function descriptor in
__secondary_hold_spinloop. Use ppc_function_entry to get the
instruction address and put it in __secondary_hold_spinloop instead.

Also fix an issue where we assumed cur_cpu_spec held a function
descriptor.

Signed-off-by: Anton Blanchard

powerpc: ABIv2 function calls must place target address in r12

2014-04-23T00:05:20+00:00

To establish addressability quickly, ABIv2 requires the target
address of the function being called to be in r12. Fix a number of
places in assembly code that we do indirect function calls.

We need to avoid function descriptors on ABIv2 too.

Signed-off-by: Anton Blanchard

powerpc: Remove some unnecessary uses of _GLOBAL() and _STATIC()

2014-04-23T00:05:18+00:00

There is no need to create a function descriptor for functions
called locally out of assembly.

Signed-off-by: Anton Blanchard

powerpc: Remove superflous function descriptors in assembly only code

2014-04-23T00:05:17+00:00

We have a number of places where we load the text address of a local
function and indirectly branch to it in assembly. Since it is an
indirect branch binutils will not know to use the function text
address, so that trick wont work.

There is no need for these functions to have a function descriptor
so we can replace it with a label and remove the dot symbol.

Signed-off-by: Anton Blanchard