Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=08da5a2ca479c5e8805dc3f77fd77176c4293399
Commit: 08da5a2ca479c5e8805dc3f77fd77176c4293399
Parent: ab144f5ec64c42218a555ec1dbde6b60cf2982d6
Author: Zachary Amsden <[EMAIL PROTECTED]>
AuthorDate: Fri Aug 10 22:31:05 2007 +0200
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Sat Aug 11 15:58:13 2007 -0700
x86_64: Early segment setup for VT
VT is very picky about when it can enter execution.
Get all segments setup and get LDT and TR into valid state to allow
VT execution under VMware and KVM (untested).
This makes the boot decompression run under VT, which makes it several
orders of magnitude faster on 64-bit Intel hardware.
Before, I was seeing times up to a minute or more to decompress a 1.3MB
kernel
on a very fast box.
Signed-off-by: Zachary Amsden <[EMAIL PROTECTED]>
Signed-off-by: Andi Kleen <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
arch/x86_64/boot/compressed/head.S | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/arch/x86_64/boot/compressed/head.S
b/arch/x86_64/boot/compressed/head.S
index 1312bfa..9fd8030 100644
--- a/arch/x86_64/boot/compressed/head.S
+++ b/arch/x86_64/boot/compressed/head.S
@@ -195,6 +195,11 @@ ENTRY(startup_64)
movl %eax, %ds
movl %eax, %es
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
* we were loaded at aligned to a 2M boundary. %rbp contains the
@@ -295,6 +300,8 @@ gdt:
.quad 0x0000000000000000 /* NULL descriptor */
.quad 0x00af9a000000ffff /* __KERNEL_CS */
.quad 0x00cf92000000ffff /* __KERNEL_DS */
+ .quad 0x0080890000000000 /* TS descriptor */
+ .quad 0x0000000000000000 /* TS continued */
gdt_end:
.bss
/* Stack for uncompression */
-
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