arch/x86/include/asm/vsyscall.h

   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 */