[Qemu-devel] x86_64 target

[Fabrice Bellard <fabrice@bellard.org>]

Hi,

As a small gift for this new year, here is an initial implementation of 
the x86_64 target in QEMU. It is a "work in progress" as usual, but it 
works enough to boot an x86_64 Linux kernel (I used the one available at 
http://bochs.sourceforge.net/guestos/linux.x86-64.bzImage).

Although the x86_64 target works correctly on 32 bit hosts, it is 
designed to have the best performances on 64 bit hosts, such as x86_64 
or ppc64. The current speed is poor relatively to the i386 emulation 
because I did not enable register usage on 64 bit hosts (no time to test 
it yet).

The biggest missing part is a full implementation of SSE - I only added 
the minimal subset for the Linux kernel. I won't work again on the 
x86_64 target in the near future (as I said earlier most of my time is 
dedicated on improving the x86 on x86 speed), but anyone is free to 
submit patches.

Fabrice.