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 __section_vgetcpu_mode __attribute__ ((unused, __section__ (".vgetcpu_mode"), aligned(16)))
  20 #define __section_jiffies __attribute__ ((unused, __section__ (".jiffies"), aligned(16)))
  21
  22 /* Definitions for CONFIG_GENERIC_TIME definitions */
  23 #define __section_vsyscall_gtod_data __attribute__ \
  24         ((unused, __section__ (".vsyscall_gtod_data"),aligned(16)))
  25 #define __section_vsyscall_clock __attribute__ \
  26         ((unused, __section__ (".vsyscall_clock"),aligned(16)))
  27 #define __vsyscall_fn \
  28         __attribute__ ((unused, __section__(".vsyscall_fn"))) notrace
  29
  30 #define VGETCPU_RDTSCP  1
  31 #define VGETCPU_LSL     2
  32
  33 extern int __vgetcpu_mode;
  34 extern volatile unsigned long __jiffies;
  35
  36 /* kernel space (writeable) */
  37 extern int vgetcpu_mode;
  38 extern struct timezone sys_tz;
  39
  40 extern void map_vsyscall(void);
  41
  42 #endif /* __KERNEL__ */
  43
  44 #endif /* _ASM_X86_VSYSCALL_H */