[lkml]   [2007]   [Aug]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 5/5] x86_64 EFI support -v3: EFI document
On Thu, 2007-08-02 at 01:16 +0800, Eric W. Biederman wrote:
> > The parameters are rearranged, because the pointer is too small. For
> > example, the EFI system table pointer is 8 bytes in x86_64, while it
> is
> > 4 bytes in i386.
> Ok. I see what is happening. When the documentation is for arch/i386
> unsigned long is 4 bytes, and you are using unsigned long to mean 8
> bytes. For an 8 byte fields please just spell out the size as 8
> bytes.

Ok. Will do in the next version.
> How does EFI handle 32bit/64bit compatibility? In particular
> how do I load a 32bit kernel on machine with a 64bit EFI? Can
> it be done?
Because the EFI memory map is converted to E820 map in bootloader now,
it is possible to load 32bit kernel on machine with a 64bit EFI. But it
is almost impossible to call EFI runtime service in 32bit kernel. But I
think EFI runtime service is not essential in this situation, because
the raw hardware can be used too.

Best Regards,
Huang Ying
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-08-07 11:33    [W:0.076 / U:5.956 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site