From 42bbdc9b26d52f8d6c79a9c9a59bfd9aa74a95a5 Mon Sep 17 00:00:00 2001
From: Aiken Harris <harraiken91@gmail.com>
Date: Wed, 13 May 2026 21:24:27 +0200
Subject: [PATCH] Fix AP trampoline stack setup

---
 xtoskrnl/ar/i686/archsup.S | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xtoskrnl/ar/i686/archsup.S b/xtoskrnl/ar/i686/archsup.S
index fd36c15..2b5e33a 100644
--- a/xtoskrnl/ar/i686/archsup.S
+++ b/xtoskrnl/ar/i686/archsup.S
@@ -254,13 +254,16 @@ _ArStartApplicationProcessor:
     movw %ax, %ds
     movw %ax, %es
     movw %ax, %ss
-    movw $0x1000, %sp
 
     /* Calculate absolute physical base address */
     xorl %ebx, %ebx
     movw %cs, %bx
     shll $4, %ebx
 
+    /* Set up a temporary stack for the AP initialization */
+    movl %ebx, %esp
+    addl $0x1000, %esp
+
     /* Load the temporary Global Descriptor Table */
     leal (ApTemporaryGdtDesc - _ArStartApplicationProcessor)(%ebx), %eax
     movl %eax, (ApTemporaryGdtBase - _ArStartApplicationProcessor)