| commit | ae853e99a7aed22cb28b387e1e3cb32dbf1ab8fa | |
| author | Thomas Letan <thomas.letan@ssi.gouv.fr> | |
| Sun, 6 Sep 2015 11:50:39 +0000 (6 07:50 -0400) | ||
| committer | Gene Cumm <gene.cumm@gmail.com> | |
| Sun, 6 Sep 2015 11:51:26 +0000 (6 07:51 -0400) | ||
| tree | b6381beb5bee75cbf41c921b2c624c0d4875651c | treesnapshot (tar.gz zip) |
| parent | 62f63cb7706974eba2c34dbea425bf2e9ede0f9e | commitdiff |
efi/x86_64: leave long mode properly
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@ssi.gouv.fr>
Tested-by: Patrick Masotta <masottaus@yahoo.com>
Tested-by: Celelibi <celelibi@gmail.com>
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@ssi.gouv.fr>
Tested-by: Patrick Masotta <masottaus@yahoo.com>
Tested-by: Celelibi <celelibi@gmail.com>
| efi/x86_64/linux.S | diffblobblamehistory |