Port test suite to multiboot

Currently the test suite uses a custom control program and BIOS as a loader. This is clumsy and annoying to work with.

This patch series ports the test suite to load with the multiboot support provided by qemu -kernel. Test binaries are now ordinary elf objects (though still with the extension .flat). A -test-device option is added to qemu to support output, memory size, and exit. With the exception of exit these can be ported to use existing qemu facilities.

To use the new tests, type

qemu-system-x86_64 -test-device -kernel /path/to/vmexit.flat

Avi Kivity (10):
Add test device for use with the test suite
test: load image immediately after program headers
test: Set up a default stack
test: add multiboot headers to startup files
test: Map 4GB of memory
test: use real APIC instead of fake APIC
test: switch output format to elf
test: Remove smp support from access.c
test: fix realmode test print_serial() direction flag
test: port readmode tests to multiboot

 hw/pc.c                        |   28 ++++++++++++++++++++
 kvm/user/flat.lds              |    4 +--
 kvm/user/test/x86/access.c     |    4 +-
 kvm/user/test/x86/cstart.S     |    9 ++++++
 kvm/user/test/x86/cstart64.S   |   26 +++++++++++++++---
 kvm/user/test/x86/realmode.c   |   54 +++++++++++++++++++++++++++++++--------
 kvm/user/test/x86/realmode.lds |    6 +---
 qemu-options.hx                |    2 +
 vl.c                           |    4 +++
 9 files changed, 111 insertions(+), 26 deletions(-)