[SeaBIOS] [PATCH 0/2] Use extra stack for all 16bit irq entry points

Kevin O'Connor kevin at koconnor.net
Sun Mar 3 21:08:40 CET 2013

This series creates a config option for using the "extra stack" for
all legacy 16bit irq entry points, and it defaults the option on.  By
using this internal stack, SeaBIOS doesn't use much of the caller's
stack and it makes it less likely a stack overflow will occur.
However, using an internal stack could break programs that call the
BIOS in 16bit protected mode.

This series was discussed about a year ago.  There haven't been any
examples located where this breaks OSes, and it is known to improve
some really old OSes (eg, DOS 1.0).  It is a config option, so if it
can be disabled to aid in testing.

Kevin O'Connor (2):
  Separate out 16bit PCI-BIOS entry point from regular int 0x1a entry
  Support using the "extra stack" for all 16bit irq entry points.

 src/Kconfig     |  9 +++++++
 src/clock.c     |  1 -
 src/config.h    |  2 +-
 src/pcibios.c   | 16 ++++++-------
 src/post.c      |  2 +-
 src/romlayout.S | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 6 files changed, 90 insertions(+), 13 deletions(-)


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