MBR: Set %si immediately upon setting %sp

diff --git a/mbr/mbr.S b/mbr/mbr.S
index edfccfb..82dc5a6 100644 (file)
--- a/mbr/mbr.S
+++ b/mbr/mbr.S
@@ -43,6 +43,7 @@ _start:
        movw    %ax, %ds
        movw    %ax, %ss
        movw    $stack, %sp
+       movw    %sp, %si
        pushw   %es             /* es:di -> $PnP header */
        pushw   %di
        pushw   %dx             /* dl -> drive number */
@@ -51,7 +52,6 @@ _start:
        cld
 
        /* Copy down to 0:0x600 */
-       movw    %sp, %si
        movw    $_start, %di
        movw    $(512/2), %cx
        rep; movsw