[SeaBIOS] [RFCv2 00/15] Experiment with PAE paging

[Kevin O'Connor]

I was curious to see if SeaBIOS could run in memory above 4GB.  This
series demonstrates that it is possible.  At the end of this
experimental patch series, SeaBIOS can relocate itself to physical ram
above 4GB and it can also run its internal threads above 4GB.

I've tested this with QEMU running FreeDOS on an ATA drive - other
configs are likely to break as most drivers have not been updated to
use ioremap().

The series is also available at:
  https://github.com/KevinOConnor/seabios/tree/testing

The first 7 patches are cleanup patches and should probably be
committed even without the others.  The remaining patches become more
specific to PAE and become increasingly more experimental.  The final
patch is mostly a hack, but it does verify that SeaBIOS could use PAE
to make full use of any RAM in the system.

Patch 14 implements PAE paging support with a simple ioremap() hash
scheme.  The first 2MB uses an identity map, and no other memory is
accessible without first calling ioremap() (or the similar memremap()
).  That scheme is probably a bit too aggressive - it would likely be
simpler to not require memremap() to access regular ram below 4GB.

-Kevin


Kevin O'Connor (15):
  e820: Introduce e820_remove() and avoid exporting E820_HOLE
  e820: Rename memmap.c to e820map.c and use consistent "e820_" prefix
  e820: Update debugging messages to report 64bit values
  virtio: Simplify vring alignment code
  virtio: Move standard definitions from virtio-ring.h to standard
    headers
  malloc: Use consistent naming for internal low-level "alloc" functions
  malloc: Introduce common helper alloc_new_detail()
  malloc: Don't mix virtual and physical addresses
  memmap: Move GDT declarations from misc.c to new file memmap.c
  optionroms: Use ioremap() on PCI rom bars to map them to memory
  smp: Use ioremap() on APIC memory
  tpm: Temporary ioremap() hack for tpm_drivers
  Implement protected mode exception handlers
  Experimental support for PAE paging
  Experiment with SeaBIOS internal memory above 4GB

 Makefile                    |   4 +-
 src/Kconfig                 |   7 ++
 src/{memmap.c => e820map.c} |  18 ++-
 src/{memmap.h => e820map.h} |   9 +-
 src/fw/coreboot.c           |   8 +-
 src/fw/csm.c                |  14 +--
 src/fw/paravirt.c           |  22 ++--
 src/fw/pciinit.c            |   6 +-
 src/fw/smp.c                |  23 ++--
 src/fw/xen.c                |   9 +-
 src/hw/pvscsi.c             |   2 +-
 src/hw/ramdisk.c            |   5 +-
 src/hw/tpm_drivers.c        |   6 +-
 src/hw/virtio-ring.h        |  36 ++----
 src/list.h                  |  10 ++
 src/malloc.c                | 296 ++++++++++++++++++++++++--------------------
 src/malloc.h                |  22 ++--
 src/memmap.c                | 282 +++++++++++++++++++++++++----------------
 src/memmap.h                |  48 +++----
 src/misc.c                  |  45 -------
 src/optionroms.c            |   5 +-
 src/pmm.c                   |  16 +--
 src/post.c                  |   6 +-
 src/romlayout.S             |  54 ++++++--
 src/stacks.c                |  17 ++-
 src/system.c                |   2 +-
 src/x86.h                   |  53 +++++++-
 27 files changed, 606 insertions(+), 419 deletions(-)
 copy src/{memmap.c => e820map.c} (90%)
 copy src/{memmap.h => e820map.h} (66%)

-- 
2.4.3