[OpenBIOS] [PATCHv2 0/4] ppc: introduce execution context

[Mark Cave-Ayland]

This patch series is part of a much larger WIP series designed to remove various hacks
from the load/init-program/go words. However in order for the follow-on series to work,
all architectures must build an execution context similar to the IEEE1275 specification
description of saved-program-state.

PPC is the only architecture which doesn't make use of contexts when entering/leaving the
Forth environment, so start by adding this functionality in order that it can be expanded
on further with later patches. While no functionality is changed by this patch, there should
be no regressions when attempting to boot existing client images.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk>

v2:
- Use single asm invocation in switch_to() with clobber register
- Fix unsigned int -> unsigned long
- Fix missing volatile from __context pointer


Mark Cave-Ayland (4):
  ppc: move call_elf() to separate switch.S file
  ppc: add new context handler
  ppc: use separate context to call client images
  ppc: unify CIF save stack layout with that of new context stack

 openbios-devel/arch/ppc/build.xml      |    2 +
 openbios-devel/arch/ppc/qemu/context.c |  140 ++++++++++++++++++
 openbios-devel/arch/ppc/qemu/context.h |   34 +++++
 openbios-devel/arch/ppc/qemu/init.c    |    4 +-
 openbios-devel/arch/ppc/qemu/ldscript  |    6 +-
 openbios-devel/arch/ppc/qemu/start.S   |  244 +++++++++++++-------------------
 openbios-devel/arch/ppc/qemu/switch.S  |  211 +++++++++++++++++++++++++++
 openbios-devel/include/arch/ppc/io.h   |    2 +-
 8 files changed, 494 insertions(+), 149 deletions(-)
 create mode 100644 openbios-devel/arch/ppc/qemu/context.c
 create mode 100644 openbios-devel/arch/ppc/qemu/context.h
 create mode 100644 openbios-devel/arch/ppc/qemu/switch.S

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1.7.10.4