include/asm-x86_64/vsyscall.h

   1 #ifndef _ASM_X86_64_VSYSCALL_H_
   2 #define _ASM_X86_64_VSYSCALL_H_
   3
   4 #include <linux/seqlock.h>
   5
   6 enum vsyscall_num {
   7         __NR_vgettimeofday,
   8         __NR_vtime,
   9 };
  10
  11 #define VSYSCALL_START (-10UL << 20)
  12 #define VSYSCALL_SIZE 1024
  13 #define VSYSCALL_END (-2UL << 20)
  14 #define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr))
  15
  16 #ifdef __KERNEL__
  17
  18 #define __section_vxtime __attribute__ ((unused, __section__ (".vxtime"), aligned(16)))
  19 #define __section_wall_jiffies __attribute__ ((unused, __section__ (".wall_jiffies"), aligned(16)))
  20 #define __section_jiffies __attribute__ ((unused, __section__ (".jiffies"), aligned(16)))
  21 #define __section_sys_tz __attribute__ ((unused, __section__ (".sys_tz"), aligned(16)))
  22 #define __section_sysctl_vsyscall __attribute__ ((unused, __section__ (".sysctl_vsyscall"), aligned(16)))
  23 #define __section_xtime __attribute__ ((unused, __section__ (".xtime"), aligned(16)))
  24 #define __section_xtime_lock __attribute__ ((unused, __section__ (".xtime_lock"), aligned(16)))
  25
  26 #define VXTIME_TSC      1
  27 #define VXTIME_HPET     2
  28 #define VXTIME_PMTMR    3
  29
  30 struct vxtime_data {
  31         long hpet_address;      /* HPET base address */
  32         unsigned long hz;       /* HPET clocks / sec */
  33         int last;
  34         unsigned long last_tsc;
  35         long quot;
  36         long tsc_quot;
  37         int mode;
  38 };
  39
  40 #define hpet_readl(a)           readl((void *)fix_to_virt(FIX_HPET_BASE) + a)
  41 #define hpet_writel(d,a)        writel(d, (void *)fix_to_virt(FIX_HPET_BASE) + a)
  42
  43 /* vsyscall space (readonly) */
  44 extern struct vxtime_data __vxtime;
  45 extern struct timespec __xtime;
  46 extern volatile unsigned long __jiffies;
  47 extern unsigned long __wall_jiffies;
  48 extern struct timezone __sys_tz;
  49 extern seqlock_t __xtime_lock;
  50
  51 /* kernel space (writeable) */
  52 extern struct vxtime_data vxtime;
  53 extern unsigned long wall_jiffies;
  54 extern struct timezone sys_tz;
  55 extern int sysctl_vsyscall;
  56 extern seqlock_t xtime_lock;
  57
  58 extern int sysctl_vsyscall;
  59
  60 #define ARCH_HAVE_XTIME_LOCK 1
  61
  62 #endif /* __KERNEL__ */
  63
  64 #endif /* _ASM_X86_64_VSYSCALL_H_ */