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powerpc/boot: Add support for 64bit little endian wrapper

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The code is only slightly modified : entry points now use the
FIXUP_ENDIAN trampoline to switch endian order. The 32bit wrapper
is kept for big endian kernels and 64bit is enforced for little
endian kernels with a PPC64_BOOT_WRAPPER config option.

The linker script is generated using the kernel preprocessor flags
to make use of the CONFIG_* definitions and the wrapper script is
modified to take into account the new elf64ppc format.

Finally, the zImage file is compiled as a position independent
executable (-pie) which makes it loadable at any address by the
firmware.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Cédric Le Goater
2014-04-24 09:23:39 +02:00
committed by Benjamin Herrenschmidt
parent 2d9afb369b
commit 147c05168f
7 changed files with 72 additions and 5 deletions
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3
arch/powerpc/boot/pseries-head.S
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@@ -1,5 +1,8 @@
#include "ppc_asm.h"
.text
.globl _zimage_start
_zimage_start:
FIXUP_ENDIAN
b _zimage_start_lib