1 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86_64/umode_enter.c b/arch/x86_64/umode_enter.c
new file mode 100644
index 0000000..3c7fa18
--- /dev/null
+++ b/arch/x86_64/umode_enter.c
@@ -0,0 +1,17 @@
+#include "tasking.h"
+
+__attribute__((noreturn))
+void
+umode_enter(void *ip, void *sp)
+{
+    __asm__ volatile("mov %0, %%rsp; \
+                      push %%rcx; \
+                      mov %1, %%rcx; \
+                      mov $0x202, %%r11; \
+                      cli; \
+                      swapgs; \
+                      sysretq"::
+                      "r"(sp), "r"(ip):
+                      "memory");
+    for(;;);
+}