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

Thomas Letan
Tue, 15 Sep 2015 07:37:28 -0000

Thanks! And sorry I didn't have the time to test more?

Le 08/09/2015 12:13, Gene Cumm a ?crit :
> 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.
>