arch/x86/include/asm/vdso/vsyscall.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_VDSO_VSYSCALL_H
   3 #define __ASM_VDSO_VSYSCALL_H
   4
   5 #ifndef __ASSEMBLY__
   6
   7 #include <linux/hrtimer.h>
   8 #include <linux/timekeeper_internal.h>
   9 #include <vdso/datapage.h>
  10 #include <asm/vgtod.h>
  11 #include <asm/vvar.h>
  12
  13 int vclocks_used __read_mostly;
  14
  15 DEFINE_VVAR(struct vdso_data, _vdso_data);
  16 /*
  17  * Update the vDSO data page to keep in sync with kernel timekeeping.
  18  */
  19 static __always_inline
  20 struct vdso_data *__x86_get_k_vdso_data(void)
  21 {
  22         return _vdso_data;
  23 }
  24 #define __arch_get_k_vdso_data __x86_get_k_vdso_data
  25
  26 static __always_inline
  27 int __x86_get_clock_mode(struct timekeeper *tk)
  28 {
  29         int vclock_mode = tk->tkr_mono.clock->archdata.vclock_mode;
  30
  31         /* Mark the new vclock used. */
  32         BUILD_BUG_ON(VCLOCK_MAX >= 32);
  33         WRITE_ONCE(vclocks_used, READ_ONCE(vclocks_used) | (1 << vclock_mode));
  34
  35         return vclock_mode;
  36 }
  37 #define __arch_get_clock_mode __x86_get_clock_mode
  38
  39 /* The asm-generic header needs to be included after the definitions above */
  40 #include <asm-generic/vdso/vsyscall.h>
  41
  42 #endif /* !__ASSEMBLY__ */
  43
  44 #endif /* __ASM_VDSO_VSYSCALL_H */