x86/boot: Setup correctly fs segment for bogus_real_magic

bogus_real_magic code uses fs segment so it should be initialised.

Fixes: d8c8fef09054 ("Provide basic Xen PM infrastructure")
Signed-off-by: Frediano Ziglio <frediano.ziglio@cloud.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/arch/x86/boot/wakeup.S b/xen/arch/x86/boot/wakeup.S
index c929fe921823038fef152bf3c1f722ff03f36771..df5ea2445739ad72f7bf6404e369301d3a2570dc 100644 (file)
--- a/xen/arch/x86/boot/wakeup.S
+++ b/xen/arch/x86/boot/wakeup.S
@@ -77,8 +77,11 @@ check_vesaw:
         ret
 
 bogus_real_magic:
+        movw    $0xb800, %ax
+        movw    %ax, %fs
+1:
         movw    $0x0e00 + 'B', %fs:(0x12)
-        jmp     bogus_real_magic
+        jmp     1b
 
         .align 4
 real_magic:     .long 0x12345678