[PATCH v7 14/27] x86, boot: Move lldt/ltr out of 64bit code section

From: Yinghai Lu
Date: Tue Dec 18 2012 - 02:16:55 EST

commit 08da5a2ca

x86_64: Early segment setup for VT

add lldt/ltr to clean more segments.

Those code are put in code64, and it is using gdt that is only
loaded from code32 path.

That breaks booting with 64bit bootloader that does not go through
code32 path. It get at startup_64 directly, and it has different

Move those lines into code32 after their gdt is loaded.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Zachary Amsden <zamsden@xxxxxxxxx>
Cc: Matt Fleming <matt.fleming@xxxxxxxxx>
arch/x86/boot/compressed/head_64.S | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index fb984c0..5c80b94 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -154,6 +154,12 @@ ENTRY(startup_32)
btsl $_EFER_LME, %eax

+ /* After gdt is loaded */
+ xorl %eax, %eax
+ lldt %ax
+ movl $0x20, %eax
+ ltr %ax
* Setup for the jump to 64bit mode
@@ -239,9 +245,6 @@ preferred_addr:
movl %eax, %ss
movl %eax, %fs
movl %eax, %gs
- lldt %ax
- movl $0x20, %eax
- ltr %ax

* Compute the decompressed kernel start address. It is where

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