From 7d5a9792e57b4088cce5cc97837eb04016b57a4d Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Thu, 31 Oct 2019 00:49:00 +0100
Subject: Implemented basic syscalls and user mode

Doesn't completely work right now
---
 src/kernel/boot.asm | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src/kernel/boot.asm')

diff --git a/src/kernel/boot.asm b/src/kernel/boot.asm
index fad05ff..8f24066 100644
--- a/src/kernel/boot.asm
+++ b/src/kernel/boot.asm
@@ -50,6 +50,25 @@ stublet:
 
 %include "src/kernel/interact.asm"
 
+global switch_to_user
+switch_to_user:
+     cli
+     mov ax,0x23
+     mov ds,ax
+     mov es,ax
+     mov fs,ax
+     mov gs,ax
+
+     mov eax,esp
+     push 0x23
+     push eax
+     pushf
+     pop eax
+     or eax, 0x200
+     push eax
+     push 0x1B
+     iret
+
 ; Store the stack
 SECTION .bss
     resb 0x2000 ; Reserve 8KiB
-- 
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