[RFC PATCH 00/18] powerpc/boot: 64bit little endian wrapper for pseries

[Cédric Le Goater]

Hi,

The following patchset adds support for 64bit little endian boot 
wrapper for pseries. It is based on original code from Andrew Tauferner. 

The first patches provide fixes for 64bit. I also changed the prom 
code to make it converge with the prom_init kernel code. They have 
a lot in common and they could probably be merged if we find a way
to do it.
 
  powerpc/boot: fix do_div for 64bit wrapper
  powerpc/boot: use a common prom_args struct in oflib
  powerpc/boot: use prom_arg_t in oflib
  powerpc/boot: add byteswapping routines in oflib
  powerpc/boot: add PROM_ERROR define in oflib
  powerpc/boot: rework of_claim() to make it 64bit friendly
  powerpc/boot: define typedef ihandle as u32
  powerpc/boot: fix compile warning in 64bit

These are for little endian only:

  powerpc/boot: define byteswapping routines for little endian
  powerpc/boot: add 64bit and little endian support to addnote
  powerpc/boot: add little endian support to elf utils

and these to support a 64bit boot wrapper in both endian order :

  powerpc/boot: define a routine to enter prom
  powerpc/boot: modify entry point for 64bit
  powerpc/boot: modify how we enter kernel on 64bit
  powerpc/boot: add a global entry point for pseries
  powerpc/boot: add support for 64bit big endian wrapper
  powerpc/boot: add support for 64bit little endian wrapper

This final patch restores the previous configuration for 64bit 
big endian kernel, which is to compile in 32bit : 

  powerpc/boot: add PPC64_BOOT_WRAPPER config option


Here are some initial topics to discuss :

  - To compile in 64bit, -m64 is added to the cross32 compiler ...
    This is not the most elegant solutions.
   
  - There are still some compile warnings due to 64bit in the 
    device tree wrapper library.

  - The boot wrapper is compiled as a position independent executable.
    This might not be an issue though.

This patchset is based on a 3.13 and was tested on qemu with the -kernel
option on little and big endian guests. It was also tested with a 
custom yaboot supporting Little Endian kernels.

Yours,

C. 

Cédric Le Goater (18):
  powerpc/boot: fix do_div for 64bit wrapper
  powerpc/boot: use a common prom_args struct in oflib
  powerpc/boot: use prom_arg_t in oflib
  powerpc/boot: add byteswapping routines in oflib
  powerpc/boot: add PROM_ERROR define in oflib
  powerpc/boot: rework of_claim() to make it 64bit friendly
  powerpc/boot: define typedef ihandle as u32
  powerpc/boot: fix compile warning in 64bit
  powerpc/boot: define byteswapping routines for little endian
  powerpc/boot: add 64bit and little endian support to addnote
  powerpc/boot: add little endian support to elf utils
  powerpc/boot: define a routine to enter prom
  powerpc/boot: modify entry point for 64bit
  powerpc/boot: modify how we enter kernel on 64bit
  powerpc/boot: add a global entry point for pseries
  powerpc/boot: add support for 64bit big endian wrapper
  powerpc/boot: add support for 64bit little endian wrapper
  powerpc/boot: add PPC64_BOOT_WRAPPER config option

 arch/powerpc/boot/Makefile             |   18 +++-
 arch/powerpc/boot/addnote.c            |  114 +++++++++++++-------
 arch/powerpc/boot/crt0.S               |  180 +++++++++++++++++++++++++++++++-
 arch/powerpc/boot/elf_util.c           |    4 +
 arch/powerpc/boot/main.c               |    4 +
 arch/powerpc/boot/of.c                 |    4 +-
 arch/powerpc/boot/of.h                 |   17 ++-
 arch/powerpc/boot/ofconsole.c          |    6 +-
 arch/powerpc/boot/oflib.c              |   94 +++++++++--------
 arch/powerpc/boot/ppc_asm.h            |   12 +++
 arch/powerpc/boot/pseries-head.S       |    8 ++
 arch/powerpc/boot/stdio.c              |   14 +++
 arch/powerpc/boot/swab.h               |   29 +++++
 arch/powerpc/boot/wrapper              |   17 ++-
 arch/powerpc/boot/zImage.lds.S         |   25 ++++-
 arch/powerpc/platforms/Kconfig.cputype |    5 +
 16 files changed, 458 insertions(+), 93 deletions(-)
 create mode 100644 arch/powerpc/boot/pseries-head.S
 create mode 100644 arch/powerpc/boot/swab.h

-- 
1.7.10.4