1 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86/include/asm/vsyscall.h b/arch/x86/include/asm/vsyscall.h
new file mode 100644
index 000000000..ab60a71a8
--- /dev/null
+++ b/arch/x86/include/asm/vsyscall.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_VSYSCALL_H
+#define _ASM_X86_VSYSCALL_H
+
+#include <linux/seqlock.h>
+#include <uapi/asm/vsyscall.h>
+
+#ifdef CONFIG_X86_VSYSCALL_EMULATION
+extern void map_vsyscall(void);
+extern void set_vsyscall_pgtable_user_bits(pgd_t *root);
+
+/*
+ * Called on instruction fetch fault in vsyscall page.
+ * Returns true if handled.
+ */
+extern bool emulate_vsyscall(unsigned long error_code,
+			     struct pt_regs *regs, unsigned long address);
+#else
+static inline void map_vsyscall(void) {}
+static inline bool emulate_vsyscall(unsigned long error_code,
+				    struct pt_regs *regs, unsigned long address)
+{
+	return false;
+}
+#endif
+
+#endif /* _ASM_X86_VSYSCALL_H */