x86-64: Rework vsyscall emulation and add vsyscall= parameter

[firefly-linux-kernel-4.4.55.git] / arch / x86 / include / asm / vsyscall.h

diff --git a/arch/x86/include/asm/vsyscall.h b/arch/x86/include/asm/vsyscall.h
index 60107072c28b71d646507a455e82c0657af24c9f..eaea1d31f753092cd19ff6cf126f6c7c0f7cedb7 100644 (file)
--- a/arch/x86/include/asm/vsyscall.h
+++ b/arch/x86/include/asm/vsyscall.h
@@ -27,6 +27,12 @@ extern struct timezone sys_tz;
 
 extern void map_vsyscall(void);
 
+/*
+ * Called on instruction fetch fault in vsyscall page.
+ * Returns true if handled.
+ */
+extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address);
+
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_X86_VSYSCALL_H */