[Xen-changelog] [xen-unstable] x86/64: Make BIOS call to declare our intention to enter long mode.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1202988289 0
# Node ID 55ae3b66b1b6e9039f13d9eec0b98864ca87ba6f
# Parent  72f52dd2dba8e0a7ac616c75520e5b168ec1eb9e
x86/64: Make BIOS call to declare our intention to enter long mode.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 xen/arch/x86/boot/trampoline.S |    7 +++++++
 1 files changed, 7 insertions(+)

diff -r 72f52dd2dba8 -r 55ae3b66b1b6 xen/arch/x86/boot/trampoline.S
--- a/xen/arch/x86/boot/trampoline.S    Thu Feb 14 11:14:17 2008 +0000
+++ b/xen/arch/x86/boot/trampoline.S    Thu Feb 14 11:24:49 2008 +0000
@@ -155,6 +155,13 @@ 1:      mov     $(BOOT_TRAMPOLINE>>4),%a
         lidt    bootsym(rm_idt)
         sti
 
+#if defined(__x86_64__)
+        /* Declare that our target operating mode is long mode. */
+        movw    $0xec00,%ax      # declare target operating mode
+        movw    $0x0002,%bx      # long mode
+        int     $0x15
+#endif
+
         /*
          * Do real-mode work:
          *  1. Get memory map.

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