From df5b25e9af9248d8e00d0ef7e4ce3eec9eb44f97 Mon Sep 17 00:00:00 2001 From: Keir Fraser Date: Thu, 14 Feb 2008 11:24:49 +0000 Subject: [PATCH] x86/64: Make BIOS call to declare our intention to enter long mode. Signed-off-by: Keir Fraser --- xen/arch/x86/boot/trampoline.S | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/xen/arch/x86/boot/trampoline.S b/xen/arch/x86/boot/trampoline.S index 2c92dc6a00..143612c91f 100644 --- a/xen/arch/x86/boot/trampoline.S +++ b/xen/arch/x86/boot/trampoline.S @@ -155,6 +155,13 @@ trampoline_boot_cpu_entry: 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. -- 2.30.2