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authorYinghai Lu <yinghai@kernel.org>2013-01-24 12:20:01 -0800
committerH. Peter Anvin <hpa@linux.intel.com>2013-01-29 15:26:19 -0800
commitd3c433bf9a01b6951286ec2cbf52e3549623d878 (patch)
tree84fe3454e2c5668471d338f41482b1c9428f43ec /arch/x86/boot
parent187a8a73cee295b9407de0d6bfba65471a1f39d6 (diff)
x86, boot: Move lldt/ltr out of 64bit code section
commit 08da5a2ca x86_64: Early segment setup for VT sets up LDT and TR into a valid state in order to speed up boot decompression under VT. 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 and jump to startup_64 directly, and it has different GDT. Move those lines into code32 after their GDT is loaded. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Link: http://lkml.kernel.org/r/1359058816-7615-21-git-send-email-yinghai@kernel.org Cc: Zachary Amsden <zamsden@gmail.com> Cc: Matt Fleming <matt.fleming@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/boot')
-rw-r--r--arch/x86/boot/compressed/head_64.S9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index fb984c0c0c9..5c80b94f6c4 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
wrmsr
+ /* 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