1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_VDSO_VSYSCALL_H 3 #define __ASM_VDSO_VSYSCALL_H 4 5 #define __VDSO_RND_DATA_OFFSET 480 6 7 #ifndef __ASSEMBLY__ 8 9 #include <linux/timekeeper_internal.h> 10 #include <vdso/datapage.h> 11 12 enum vvar_pages { 13 VVAR_DATA_PAGE_OFFSET, 14 VVAR_TIMENS_PAGE_OFFSET, 15 VVAR_NR_PAGES, 16 }; 17 18 #define VDSO_PRECISION_MASK ~(0xFF00ULL<<48) 19 20 extern struct vdso_data *vdso_data; 21 22 /* 23 * Update the vDSO data page to keep in sync with kernel timekeeping. 24 */ 25 static __always_inline 26 struct vdso_data *__arm64_get_k_vdso_data(void) 27 { 28 return vdso_data; 29 } 30 #define __arch_get_k_vdso_data __arm64_get_k_vdso_data 31 32 static __always_inline 33 struct vdso_rng_data *__arm64_get_k_vdso_rnd_data(void) 34 { 35 return (void *)vdso_data + __VDSO_RND_DATA_OFFSET; 36 } 37 #define __arch_get_k_vdso_rng_data __arm64_get_k_vdso_rnd_data 38 39 static __always_inline 40 void __arm64_update_vsyscall(struct vdso_data *vdata, struct timekeeper *tk) 41 { 42 vdata[CS_HRES_COARSE].mask = VDSO_PRECISION_MASK; 43 vdata[CS_RAW].mask = VDSO_PRECISION_MASK; 44 } 45 #define __arch_update_vsyscall __arm64_update_vsyscall 46 47 /* The asm-generic header needs to be included after the definitions above */ 48 #include <asm-generic/vdso/vsyscall.h> 49 50 #endif /* !__ASSEMBLY__ */ 51 52 #endif /* __ASM_VDSO_VSYSCALL_H */ 53