From ef907825e861b63726952bb34b425a98f34ed412 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 24 Jul 2025 13:52:42 +0000
Subject: x86_64: provide a clean slate on entry to long mode

---
 arch/x86_64/src/boot/entry64.s | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

(limited to 'arch/x86_64/src/boot/entry64.s')

diff --git a/arch/x86_64/src/boot/entry64.s b/arch/x86_64/src/boot/entry64.s
index 110ced8..c5df5db 100644
--- a/arch/x86_64/src/boot/entry64.s
+++ b/arch/x86_64/src/boot/entry64.s
@@ -10,10 +10,20 @@ _entry64:
     mov %rax, %fs
     mov %rax, %gs
 
-    xor %rax, %rax
-
     call invoke_global_constructors
     
+    xor %rax, %rax
+    mov %rax, %rbp
+    mov %rax, %rdx
+    mov %rax, %rsi
+
+    mov $stack_size, %rcx
+    shr $3, %rcx
+    lea (stack_bottom), %rdi
+    rep stosq
+
+    mov %rax, %rdi
+
     call main
 
 1:
-- 
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