What's the point of allocating the protected mode code on 0x100000 only (UEFI)

What's the point of allocating the protected mode code on 0x100000 only (UEFI)

[George Buranov]

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Hello,

I just found another computer with working UEFI (I was testing on UEFI
simulation) and just found that the kernel load does not work. I found out
that the problem is in code

  /* Next, find free pages for the protected mode code.  */
  /* XXX what happens if anything is using this address?  */
  prot_mode_mem = grub_efi_allocate_pages (0x100000, prot_mode_pages + 1);
  if (! prot_mode_mem)
    {
      grub_error (GRUB_ERR_OUT_OF_MEMORY,
          "cannot allocate protected mode pages");
      goto fail;
    }

This function return with false for me. I am continuing investigation, but
maybe you know the reason why the allocation is on this special address? Can
we change it?

Regards,
Georgy

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Re: What's the point of allocating the protected mode code on 0x100000 only (UEFI)

[Vladimir 'φ-coder/phcoder' Serbinenko]

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George Buranov wrote:
> Hello,
>
> I just found another computer with working UEFI (I was testing on UEFI
> simulation) and just found that the kernel load does not work. I found
> out that the problem is in code
>
>   /* Next, find free pages for the protected mode code.  */
>   /* XXX what happens if anything is using this address?  */
>   prot_mode_mem = grub_efi_allocate_pages (0x100000, prot_mode_pages + 1);
>   if (! prot_mode_mem)
>     {
>       grub_error (GRUB_ERR_OUT_OF_MEMORY,
>           "cannot allocate protected mode pages");
>       goto fail;
>     }
>
> This function return with false for me. I am continuing investigation,
> but maybe you know the reason why the allocation is on this special
> address? Can we change it?
As I already said I have a working prototype for this in newreloc branch.
>
> Regards,
> Georgy
> ------------------------------------------------------------------------
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/grub-devel
>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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Re: Re: What's the point of allocating the protected mode code on 0x100000 only (UEFI)

[gburanov]

> As I already said I have a working prototype for this in newreloc branch.

Thanks you, it works!
-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko




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