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