1 #ifndef _ASM_X86_VSYSCALL_H
2 #define _ASM_X86_VSYSCALL_H
3 
4 enum vsyscall_num {
5 	__NR_vgettimeofday,
6 	__NR_vtime,
7 	__NR_vgetcpu,
8 };
9 
10 #define VSYSCALL_START (-10UL << 20)
11 #define VSYSCALL_SIZE 1024
12 #define VSYSCALL_END (-2UL << 20)
13 #define VSYSCALL_MAPPED_PAGES 1
14 #define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr))
15 
16 #ifdef __KERNEL__
17 #include <linux/seqlock.h>
18 
19 #define VGETCPU_RDTSCP	1
20 #define VGETCPU_LSL	2
21 
22 /* kernel space (writeable) */
23 extern int vgetcpu_mode;
24 extern struct timezone sys_tz;
25 
26 #include <asm/vvar.h>
27 
28 extern void map_vsyscall(void);
29 
30 /*
31  * Called on instruction fetch fault in vsyscall page.
32  * Returns true if handled.
33  */
34 extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address);
35 
36 #endif /* __KERNEL__ */
37 
38 #endif /* _ASM_X86_VSYSCALL_H */
39