[syslinux] [PATCH] efi: leaving long mode in kernel_jump routine

Gene Cumm
Tue, 08 Sep 2015 10:13:48 -0000

On Tue, Aug 4, 2015 at 2:55 AM, Thomas Letan via Syslinux
<syslinux at zytor.com> wrote:
> Syslinux 6.03 (efi64) fails to boot a 32-bit kernel. The way Syslinux
> leaves long mode in kernel_jump assembly routine does not follow AMD64
> specifications. More precisely:
> 1. After setting a new GADT, `cs` has to be refresh by doing a long
> jump, but it is not
> 2. Other segments have to be updated, but they are not
> 3. Disabling paging has to be done before disabling long mode, but the
> implementation does the opposite
>
> In most cases, a computer that tries to execute the kernel_jump routine
> reboot (it can also hangs). This patch fixes the kernel_jump routine.
>
> Signed-off-by: Thomas Letan <thomas.letan at ssi.gouv.fr>

Merged.  Thanks.

--
-Gene