[SeaBIOS] [RFC][PATCH 0/2] Use extra stack for all regular real-mode entry points

[Kevin O'Connor]

This simple series changes SeaBIOS to use its extra stack for all
regular real-mode software interrupt entry points.  This has the
advantage of using significantly less stack space, which can make old
programs more likely to run.  As an example, SeaBIOS can boot and run
DOS 1.0 with this series applied.

However, by using the extra stack (which resides in the e-segment),
the code will likely not work for any code that invokes the real-mode
software interrupts while in 16bit protected mode.  I don't believe
that is common, but it is difficult to know if there are any users.  I
will send a separate email on that topic.

-Kevin


Kevin O'Connor (2):
  Check for and handle PCI BIOS calls separately from handle_1a path.
  Jump into extra stack for all regular real-mode software irq entry
    points.

 src/clock.c     |    2 +-
 src/config.h    |    2 +-
 src/pcibios.c   |   12 ++++++++--
 src/post.c      |    2 +-
 src/romlayout.S |   68 +++++++++++++++++++++++++++++++++++++++++++++++++++----
 src/util.h      |    1 -
 6 files changed, 76 insertions(+), 11 deletions(-)

-- 
1.7.10.2