From f60d40f3bf4dfe8ed6f63a27367d323319a4ef97 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Fri, 25 Jun 2021 16:22:43 +0200
Subject: ring3

---
 kernel/main.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'kernel/main.c')

diff --git a/kernel/main.c b/kernel/main.c
index d2f0693..e63ca14 100644
--- a/kernel/main.c
+++ b/kernel/main.c
@@ -1,8 +1,24 @@
 #include <kernel/gdt.h>
 #include <kernel/tty.h>
+#include <platform/sysenter.h>
+
+extern void stack_top;
+
+void r3_test();
 
 void kmain()
 {
 	tty_clear();
 	gdt_init();
+	sysenter_setup();
+
+	tty_write("user...", 7);
+	sysexit(r3_test, &stack_top);
+}
+
+void r3_test() {
+	tty_write("in ring3", 8);
+	asm("cli"); // privileged instruction, should cause a GP
+	tty_write(" oh no", 6); // shouldn't happen
+	for (;;) {}
 }
-- 
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