* Re: x86_64 to i386 boot generation conversion
[not found] <OF04C4C046.D5157530-ONC125838A.003564B9-C125838A.003564BA@local>
@ 2019-01-22 10:04 ` Roger Pau Monné
0 siblings, 0 replies; only message in thread
From: Roger Pau Monné @ 2019-01-22 10:04 UTC (permalink / raw)
To: nicolas.poirot; +Cc: xen-devel
On Tue, Jan 22, 2019 at 10:43:11AM +0100, nicolas.poirot@bertin.fr wrote:
> Hi everyone,
>
> I was wondering why when I build an x86_64 xen I got a mkelf32 command converting elf 64 to elf 32.
> My understanding, looking at git-log, is that that was needed for 32bits bootloaders.
>
> Is that the only reason ? Is it still necessary today ?
The original multiboot specification [0] only deals with 32bit
addresses, so the elf headers need to be 32 bits for multiboot to be
able to load it. The more that the kernel is started in protected
mode, so addresses must be below the 4G boundary or else loading or
jumping into the entry point would fail.
Roger.
[0] https://www.gnu.org/software/grub/manual/multiboot/multiboot.html
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2019-01-22 10:04 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <OF04C4C046.D5157530-ONC125838A.003564B9-C125838A.003564BA@local>
2019-01-22 10:04 ` x86_64 to i386 boot generation conversion Roger Pau Monné
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.