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/* 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>
#include <asm/page_types.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
/*
* The (legacy) vsyscall page is the long page in the kernel portion
* of the address space that has user-accessible permissions.
*/
static inline bool is_vsyscall_vaddr(unsigned long vaddr)
{
return unlikely((vaddr & PAGE_MASK) == VSYSCALL_ADDR);
}
#endif /* _ASM_X86_VSYSCALL_H */