arch/arm64/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/timekeeper_internal.h>
   8 #include <vdso/datapage.h>
   9
  10 #define VDSO_PRECISION_MASK     ~(0xFF00ULL<<48)
  11
  12 extern struct vdso_data *vdso_data;
  13
  14 /*
  15  * Update the vDSO data page to keep in sync with kernel timekeeping.
  16  */
  17 static __always_inline
  18 struct vdso_data *__arm64_get_k_vdso_data(void)
  19 {
  20         return vdso_data;
  21 }
  22 #define __arch_get_k_vdso_data __arm64_get_k_vdso_data
  23
  24 static __always_inline
  25 int __arm64_get_clock_mode(struct timekeeper *tk)
  26 {
  27         u32 use_syscall = !tk->tkr_mono.clock->archdata.vdso_direct;
  28
  29         return use_syscall;
  30 }
  31 #define __arch_get_clock_mode __arm64_get_clock_mode
  32
  33 static __always_inline
  34 void __arm64_update_vsyscall(struct vdso_data *vdata, struct timekeeper *tk)
  35 {
  36         vdata[CS_HRES_COARSE].mask      = VDSO_PRECISION_MASK;
  37         vdata[CS_RAW].mask              = VDSO_PRECISION_MASK;
  38 }
  39 #define __arch_update_vsyscall __arm64_update_vsyscall
  40
  41 /* The asm-generic header needs to be included after the definitions above */
  42 #include <asm-generic/vdso/vsyscall.h>
  43
  44 #endif /* !__ASSEMBLY__ */
  45
  46 #endif /* __ASM_VDSO_VSYSCALL_H */