1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _ASM_X86_VSYSCALL_H 3*4882a593Smuzhiyun #define _ASM_X86_VSYSCALL_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/seqlock.h> 6*4882a593Smuzhiyun #include <uapi/asm/vsyscall.h> 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #ifdef CONFIG_X86_VSYSCALL_EMULATION 9*4882a593Smuzhiyun extern void map_vsyscall(void); 10*4882a593Smuzhiyun extern void set_vsyscall_pgtable_user_bits(pgd_t *root); 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun /* 13*4882a593Smuzhiyun * Called on instruction fetch fault in vsyscall page. 14*4882a593Smuzhiyun * Returns true if handled. 15*4882a593Smuzhiyun */ 16*4882a593Smuzhiyun extern bool emulate_vsyscall(unsigned long error_code, 17*4882a593Smuzhiyun struct pt_regs *regs, unsigned long address); 18*4882a593Smuzhiyun #else map_vsyscall(void)19*4882a593Smuzhiyunstatic inline void map_vsyscall(void) {} emulate_vsyscall(unsigned long error_code,struct pt_regs * regs,unsigned long address)20*4882a593Smuzhiyunstatic inline bool emulate_vsyscall(unsigned long error_code, 21*4882a593Smuzhiyun struct pt_regs *regs, unsigned long address) 22*4882a593Smuzhiyun { 23*4882a593Smuzhiyun return false; 24*4882a593Smuzhiyun } 25*4882a593Smuzhiyun #endif 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun #endif /* _ASM_X86_VSYSCALL_H */ 28