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authorZachary Amsden <zach@vmware.com>2007-08-10 16:31:05 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-11 18:58:13 -0400
commit08da5a2ca479c5e8805dc3f77fd77176c4293399 (patch)
treee7d5feba7b6912b1138f8c1e7635ffebefb5e78b /arch/x86_64/boot
parentab144f5ec64c42218a555ec1dbde6b60cf2982d6 (diff)
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 <zach@vmware.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86_64/boot')
-rw-r--r--arch/x86_64/boot/compressed/head.S7
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 1312bfaff306..9fd8030cc54f 100644
--- a/arch/x86_64/boot/compressed/head.S
+++ b/arch/x86_64/boot/compressed/head.S
@@ -195,6 +195,11 @@ ENTRY(startup_64)
195 movl %eax, %ds 195 movl %eax, %ds
196 movl %eax, %es 196 movl %eax, %es
197 movl %eax, %ss 197 movl %eax, %ss
198 movl %eax, %fs
199 movl %eax, %gs
200 lldt %ax
201 movl $0x20, %eax
202 ltr %ax
198 203
199 /* Compute the decompressed kernel start address. It is where 204 /* Compute the decompressed kernel start address. It is where
200 * we were loaded at aligned to a 2M boundary. %rbp contains the 205 * we were loaded at aligned to a 2M boundary. %rbp contains the
@@ -295,6 +300,8 @@ gdt:
295 .quad 0x0000000000000000 /* NULL descriptor */ 300 .quad 0x0000000000000000 /* NULL descriptor */
296 .quad 0x00af9a000000ffff /* __KERNEL_CS */ 301 .quad 0x00af9a000000ffff /* __KERNEL_CS */
297 .quad 0x00cf92000000ffff /* __KERNEL_DS */ 302 .quad 0x00cf92000000ffff /* __KERNEL_DS */
303 .quad 0x0080890000000000 /* TS descriptor */
304 .quad 0x0000000000000000 /* TS continued */
298gdt_end: 305gdt_end:
299 .bss 306 .bss
300/* Stack for uncompression */ 307/* Stack for uncompression */