| 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 | #include <asm/page_types.h> |
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| 8 | |
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| 9 | #ifdef CONFIG_X86_VSYSCALL_EMULATION |
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| 10 | extern void map_vsyscall(void); |
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| 11 | extern void set_vsyscall_pgtable_user_bits(pgd_t *root); |
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| 12 | |
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| 13 | /* |
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| 14 | * Called on instruction fetch fault in vsyscall page. |
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| 15 | * Returns true if handled. |
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| 16 | */ |
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| 17 | extern bool emulate_vsyscall(unsigned long error_code, |
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| 18 | struct pt_regs *regs, unsigned long address); |
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| 19 | #else |
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| 20 | static inline void map_vsyscall(void) {} |
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| 21 | static inline bool emulate_vsyscall(unsigned long error_code, |
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| 22 | struct pt_regs *regs, unsigned long address) |
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| 23 | { |
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| 24 | return false; |
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| 25 | } |
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| 26 | #endif |
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| 27 | |
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| 28 | /* |
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| 29 | * The (legacy) vsyscall page is the long page in the kernel portion |
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| 30 | * of the address space that has user-accessible permissions. |
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| 31 | */ |
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| 32 | static inline bool is_vsyscall_vaddr(unsigned long vaddr) |
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| 33 | { |
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| 34 | return unlikely((vaddr & PAGE_MASK) == VSYSCALL_ADDR); |
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| 35 | } |
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| 36 | |
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| 37 | #endif /* _ASM_X86_VSYSCALL_H */ |
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| 38 | |
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