[Xen-devel] [PATCH] make x86_64 boot gdt size exact (like x86).

[Steven Rostedt <rostedt@xxxxxxxxxxx>]

Andi,

Here's another patch that is basically a copy from x86's boot/setup.S.
It makes the GDT limit the exact size that is needed.  I tested this with
the same Xen test that broke the original 0x8000 size, and it booted just
fine.

Note, If you already pushed my previous patch. This patch should easily be
applied by manually removing the extra zero.

-- Steve

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>

Index: linux-2.6.18-hack/arch/x86_64/boot/setup.S
===================================================================
--- linux-2.6.18-hack.orig/arch/x86_64/boot/setup.S
+++ linux-2.6.18-hack/arch/x86_64/boot/setup.S
@@ -836,13 +836,15 @@ gdt:
        .word   0x9200                          # data read/write
        .word   0x00CF                          # granularity = 4096, 386
                                                #  (+5th nibble of limit)
+gdt_end:
+       .align  4
+
+       .word   0                               # alignment byte
 idt_48:
        .word   0                               # idt limit = 0
        .word   0, 0                            # idt base = 0L
 gdt_48:
-       .word   0x8000                          # gdt limit=2048,
-                                               #  256 GDT entries
-
+       .word   gdt_end - gdt - 1               # gdt limit
        .word   0, 0                            # gdt base (filled in later)

 # Include video setup & detection code

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel