Use internal 16-bit stack for added safety.

diff --git a/src/arch/i386/prefix/pxeprefix.S b/src/arch/i386/prefix/pxeprefix.S
index ca1a00c..31b2102 100644 (file)
--- a/src/arch/i386/prefix/pxeprefix.S
+++ b/src/arch/i386/prefix/pxeprefix.S
@@ -700,6 +700,10 @@ run_etherboot:
        /* Install Etherboot */
        call    install
 
+       /* Set up real-mode stack */
+       movw    %bx, %ss
+       movw    $_estack16, %sp
+
 #ifdef PXELOADER_KEEP_UNDI
        /* Copy our undi_device structure to the preloaded_undi variable */
        movw    %bx, %es