1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_X86_VSYSCALL_H 3#define _ASM_X86_VSYSCALL_H 4 5#include <linux/seqlock.h> 6#include <uapi/asm/vsyscall.h> 7 8#ifdef CONFIG_X86_VSYSCALL_EMULATION 9extern void map_vsyscall(void); 10extern void set_vsyscall_pgtable_user_bits(pgd_t *root); 11 12/* 13 * Called on instruction fetch fault in vsyscall page. 14 * Returns true if handled. 15 */ 16extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address); 17#else 18static inline void map_vsyscall(void) {} 19static inline bool emulate_vsyscall(struct pt_regs *regs, unsigned long address) 20{ 21 return false; 22} 23#endif 24 25#endif /* _ASM_X86_VSYSCALL_H */ 26