arch/x86/include/asm/vsyscall.h

   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
   9 extern void map_vsyscall(void);
  10 extern 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  */
  16 extern bool emulate_vsyscall(unsigned long error_code,
  17                              struct pt_regs *regs, unsigned long address);
  18 #else
  19 static inline void map_vsyscall(void) {}
  20 static inline bool emulate_vsyscall(unsigned long error_code,
  21                                     struct pt_regs *regs, unsigned long address)
  22 {
  23         return false;
  24 }
  25 #endif
  26
  27 #endif /* _ASM_X86_VSYSCALL_H */