Hello here is a new version of efiemu. Now with 64-bit, virtual and 
clock support. Additionally I added a lot of comments and changelog. 
Remaining drawbacks:
- No wakeup support
- Can't hide bios
- No way to provide non-volatility for variables
- No reset function
These problems can't be addressed in bios environment (and are trivially 
fixed with coreboot) I consider this work conceptually complete on bios.
Usage cases:
-look how OS works in EFI environments. Debugging. Debugging ACPI
-launch darwin on non-EFI machine without usage of unmaintained buggy 
kernel patches (I already have xnu loading, it works but I have to fix 
few things)
-future port of coreboot to mac without losing ability to launch Mac OS X
Usage:
First compile grub2 with this patch and efiemu runtime (in archive)
Then on grub prompt
efiemu_loadcore <efiemu runtime>
efiemu_pnvram <variables file>
efiemu_acpi [-x <tables to delete>] <tables to add if any>
efiemu_prepare
linux_efiemu <normal linux>
initrd_efiemu <initrd>
Soon I'll also submit xnu patch which uses efiemu on non-EFI platforms
Programming note:
To keep compact I use defered allocation of all objects
-- 

Regards
Vladimir 'phcoder' Serbinenko