# Port DragonFly to the AMD64 architecture 

A [Google Summer of Code](http://code.google.com/soc/2008) project.

Student: Jordan Gordeev

Mentor: Matthew Dillon


# What's this all about? 

This project is about mixing DragonFly/i386 code and FreeBSD/amd64 code with human intelligence in order to produce DragonFly/amd64.



# What I promised to deliver 



1. Functioning 64-bit kernel (Linux emulation and NDIS wrapper support not included) - available by midterm

2. Working non-threaded 64-bit userland. - available by midterm

3. 64-bit SMP.

4. Working threaded 64-bit programs.

5. 64-bit vkernels.

6. 32-bit apps working on 64-bit kernels. - optional, if nothing goes wrong



# Where's the code? 

The code is in a Subversion repository available at svn://sometimes.studgrad.net/amd64.



# What's the current status? 


* The kernel crashes in the boot sequence soon after leavecrit.


* The serial console works.


* ddb supposedly works.


* Current hot areas: pmap & vm code.



# Various questions with answers 

Q:  **How do I build a 64-bit kernel for testing?** 

A: Execute the following steps:

 1. `cd /usr/src`

 1. `make TARGET_ARCH=amd64 TARGET_PLATFORM=pc64 buildworld`

 1. `make TARGET_ARCH=amd64 TARGET_PLATFORM=pc64 KERNCONF=JG64 buildkernel`



Your kernel is now in `/usr/obj/usr/src/sys/AMD64_GENERIC/kernel.debug`.


Q:  **How do I boot the 64-bit kernel?** 

A: Copy the 64-bit kernel to a convenient location, e.g. '/kernel64'. Reboot your 64-bit system and at the loader menu choose option 6 (escape to prompt). Enter the following commands:

 1. `unload`

 1. `unset acpi_load`

 1. `load /kernel64`

 1. `boot`



Q: ***'I get an error when trying to boot the 64-bit kernel: "can't load file '/kernel64': input/output error". What's wrong?***'

A: Your boot loader isn't prepared to load a 64-bit kernel. You need to recompile and reinstall your boot loader.



If you've got other questions, add them here or e-mail me at jgordeev@dir.bg.