x86-64

[pskyboy]

Hey,

After a long two year break i decided to dig deep into the deeps off my hard drive and pull my OS out. After all this time i was wondering if anyone had managed to get a bootloader jumping into longmode yet as this is the key to my operating system.

Cheers
Peter

[AR]

You'll have to write your own bootloader, or at least an intermediate bootloader between GRUB and your kernel to initalise longmode for you.

I am currently writing a bootloader that will do pretty much the same stuff as GRUB but will support longmode kernels but I can't tell you how long it will take before it's finished (probably quite some time).

[pskyboy]

I already have a bootloader for P-Mode i was just wondering if anyone had figured out how to get into Long mode and if so could i have a look at there code.

[AR]

I think Brendan's OS has a 64bit kernel, there was also someone called "kernel64" on the boards but other than that your best source would be the official docs from AMD.

[Brendan]

Hi,

I think Brendan's OS has a 64bit kernel, there was also someone called "kernel64" on the boards but other than that your best source would be the official docs from AMD.

Sorry, mine supports just about everything except 64 bit - it'll detect CPU/s capable of 64 bit and attempt to find 64 bit setup code and a 64 bit kernel within the boot image, but these don't exist so it defaults to 32 bit code .


Cheers,

Brendan

[Dex4u]

Basically you start in realmode then go to pmode and then long mode.
Here is some code to do it.
Hope this helps.

[pskyboy]

Cheers

What i really needed was a NASM compatible assembler supporting x86-64 which is YASM. Just what i was looking for, hopefully i can get it running in LMODE now.

Pete