From 4151273dbd7db23ec76bca32cea158c5f181d241 Mon Sep 17 00:00:00 2001
From: Braiden Vasco <braiden-vasco@users.noreply.github.com>
Date: Sun, 5 Nov 2017 15:37:11 +0000
Subject: [PATCH] Add function "tasks_switch_to_user"

---
 arch/Makefile  |  1 +
 arch/tasks.asm | 20 ++++++++++++++++++++
 arch/tasks.h   |  6 ++++++
 3 files changed, 27 insertions(+)
 create mode 100644 arch/tasks.asm
 create mode 100644 arch/tasks.h

diff --git a/arch/Makefile b/arch/Makefile
index bedcf42..a4af85e 100644
--- a/arch/Makefile
+++ b/arch/Makefile
@@ -19,6 +19,7 @@ OBJS += kprintf.c.o
 OBJS += protected.c.o protected.asm.cpp.o
 
 OBJS += tss.c.o tss.asm.cpp.o
+OBJS += tasks.asm.cpp.o
 
 OBJS += interrupt.asm.cpp.o
 
diff --git a/arch/tasks.asm b/arch/tasks.asm
new file mode 100644
index 0000000..a6aa4f1
--- /dev/null
+++ b/arch/tasks.asm
@@ -0,0 +1,20 @@
+#include "config.h"
+
+[GLOBAL tasks_switch_to_user]
+
+tasks_switch_to_user:
+    mov ebx, [esp+4]
+
+    mov ax, GDT_USER_DS_SELECTOR
+    mov ds, ax
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+
+    mov eax, esp
+    push GDT_USER_DS_SELECTOR
+    push eax
+    pushf
+    push GDT_USER_CS_SELECTOR
+    push ebx
+    iret
diff --git a/arch/tasks.h b/arch/tasks.h
new file mode 100644
index 0000000..3834adb
--- /dev/null
+++ b/arch/tasks.h
@@ -0,0 +1,6 @@
+#ifndef KERNELMQ_INCLUDED_TASKS
+#define KERNELMQ_INCLUDED_TASKS 1
+
+void tasks_switch_to_user(unsigned long addr);
+
+#endif