PAE question

Hi guys...
I have some problem with setting PAE.
As I see it these steps should do the work in case my code is in the first MB:

Here is something that resembles my code

Code:

 ; Here I start in PM with a basic flat model
        mov     edi, PDPE_BASE
        mov     cr3, edi
        
        mov     eax, cr4
        or      eax, PAE_BIT
        mov     cr4, eax

        mov     eax, APP_PDE
        mov     ebx, eax
        shr     eax, 20
        shl     ebx, 12
        or      ebx, P_BIT
        stosd
        mov     eax, ebx
        stosd
        
        mov     ecx, 6
        xor     eax, eax
        rep     stosd
        
        mov     edi, APP_PDE
        xor     eax, eax
        or      eax, P_BIT + PS_BIT
        stosd
        xor     eax, eax
        stosd
        
        mov     ecx, 511*2
        xor     eax, eax
        rep     stosd

        mov     eax, cr0
        or      eax, PAGING_BIT
        mov     cr0, eax

; Do something

While "Do something" could probably be a far jump
or anything else that executes with paging mechanism
running (thats why 1:1 mapping), but anyway, with
this code it never reached.
Once paging bit is set everything goes to hell and crashes...

I do realize that I can set all those pages from RM,
and only then enable paging, without the need of 1:1
mapping, because paging wouldn't be really enabled untill
some far jump.
However, this should work also. Doesn't it?