From ace65b453151845bc361f21f3e5b651c35f9f126 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Wed, 22 May 2024 13:00:41 -0400
Subject: massive refactor for mp and organization

---
 arch/x86_64/umode_enter.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 arch/x86_64/umode_enter.c

(limited to 'arch/x86_64/umode_enter.c')

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(;;);
+}
-- 
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