From: james.harris.1@gmail.com   
      
   On 06/12/2022 17:00, אורי ויסבלום wrote:   
      
   > First of all, thank you all for replying, I really appreciate it.   
   >   
   > James:   
   >> If in 32-bit mode do you have a page directory and the requisite initial   
   > page tables set up (or the equivalent) and do they identity-map the code   
   > location you are running at? Are they all marked Present and are all   
   > their other bits correct?   
   >   
   > Yes, I mean no instructions are happening after I set CR0. Didn't know it   
   needs to JMP to a new line of code after it, I thought the jump at the end of   
   the scope of the function is enough, but it makes a lot of sense I should   
   identity-map the kernel's    
   code into virtual mode. But I reckon it's not my only problem there.   
      
   Over the years Intel have said that after enabling paging (with MOV CR0)   
   some of their processors require a JMP, others require identity paging   
   and still others require both. It's more portable to use identity   
   mapping and a jump of some sort such as   
      
      mov cr0, eax   
      jmp .next   
      .next:   
      
   Your RET /might be/ good enough as the "jump" or it might not. I don't   
   know. It's safest just to include a JMP so as to be sure your code meets   
   Intel specs. (I cannot comment on AMD chips but they would likely have   
   the same requirements as Intel.)   
      
      
   --   
   James Harris   
      
   --- SoupGate-Win32 v1.05   
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