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-rw-r--r--src/arch/x86/c_exit.S38
1 files changed, 38 insertions, 0 deletions
diff --git a/src/arch/x86/c_exit.S b/src/arch/x86/c_exit.S
new file mode 100644
index 0000000000..e5b9bf8d74
--- /dev/null
+++ b/src/arch/x86/c_exit.S
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/ram_segs.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/cr.h>
+
+
+#ifdef __x86_64__
+
+ /*
+ * Functions to handle mode switches from long mode to protected
+ * mode.
+ */
+.text
+.code64
+ .section ".text.protected_mode_jump", "ax", @progbits
+ .globl protected_mode_jump
+protected_mode_jump:
+
+ push %rbp
+ mov %rsp, %rbp
+
+ /* Arguments to stack */
+ push %rdi
+ push %rsi
+
+ #include <cpu/x86/64bit/exit32.inc>
+
+ movl -8(%ebp), %eax /* Function to call */
+ movl -16(%ebp), %ebx /* Argument 0 */
+
+ /* Align the stack */
+ andl $0xFFFFFFF0, %esp
+ subl $12, %esp
+ pushl %ebx /* Argument 0 */
+
+ jmp *%eax
+#endif