Add stubdomain support. See stubdom/README for usage details.

- Move PAGE_SIZE and STACK_SIZE into __PAGE_SIZE and __STACK_SIZE in
  arch_limits.h so as to permit getting them from there without
  pulling all the internal Mini-OS defines.
- Setup a xen-elf cross-compilation environment in stubdom/cross-root
- Add a POSIX layer on top of Mini-OS by linking against the newlib C
  library and lwIP, and implementing the Unixish part in mini-os/lib/sys.c
- Cross-compile zlib and libpci too.
- Add an xs.h-compatible layer on top of Mini-OS' xenbus.
- Cross-compile libxc with an additional xc_minios.c and a few things
  disabled.
- Cross-compile ioemu with an additional block-vbd, but without sound,
  tpm and other details.  A few hacks are needed:
  - Align ide and scsi buffers at least on sector size to permit
  direct transmission to the block backend. While we are at it, just
  page-align it to possibly save a segment. Also, limit the scsi
  buffer size because of limitations of the block paravirtualization
  protocol.
  - Allocate big tables dynamically rather that letting them go to
  bss: when Mini-OS gets installed in memory, bss is not lazily
  allocated, and doing so during Mini-OS is unnecessarily trick while
  we can simply use malloc.
- Had to change the Mini-OS compilation somehow, so as to export
  Mini-OS compilation flags to the Makefiles of libxc and ioemu.

Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/stubdom/README b/stubdom/README
new file mode 100644
index 0000000000..42c47601fa
--- /dev/null
+++ b/stubdom/README
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+To compile
+==========
+
+Just run make -j 4, that will download / patch / compile
+Then make install to install the result.
+
+Also, run make and make install in $XEN_ROOT/tools/fs-back
+
+To run
+======
+
+mkdir -p /exports/usr/share/qemu
+ln -s /usr/share/qemu/keymaps /exports/usr/share/qemu
+/usr/sbin/fs-backend &
+
+
+In your HVM config "hvmconfig",
+
+- use VNC, set vnclisten to "172.30.206.1" for instance:
+
+vnc=1 
+vnclisten="172.30.206.1" 
+
+- use /usr/lib/xen/bin/stubdom-dm as dm script
+
+device_model = '/usr/lib/xen/bin/stubdom-dm'
+
+- comment the disk statement:
+#disk = [  'file:/tmp/install.iso,hdc:cdrom,r', 'phy:/dev/sda6,hda,w', 'file:/tmp/test,hdb,r' ]
+
+Create /etc/xen/stubdom-hvmconfig ("hvmconfig" must match your main config file)
+with
+
+kernel="/usr/lib/xen/boot/stubdom.gz"
+vif=[ 'ip=172.30.206.1', 'ip=10.0.1.1,mac=aa:00:00:12:23:34']
+disk = [  'file:/tmp/install.iso,hdc:cdrom,r', 'phy:/dev/sda6,hda,w', 'file:/tmp/test,hdb,r' ]
+
+where
+- 172.30.206.1 is the IP for vnc,
+- 'ip=10.0.1.1,mac=' is the same net configuration as in the hvmconfig script,
+- and disk = is the same block configuration as in the hvmconfig script.