1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright 2012 Konstantin Belousov <kib@FreeBSD.ORG>. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef _SYS_VDSO_H 29 #define _SYS_VDSO_H 30 31 #include <sys/types.h> 32 #include <machine/vdso.h> 33 34 struct vdso_timehands { 35 uint32_t th_algo; 36 uint32_t th_gen; 37 uint64_t th_scale; 38 uint32_t th_offset_count; 39 uint32_t th_counter_mask; 40 struct bintime th_offset; 41 struct bintime th_boottime; 42 VDSO_TIMEHANDS_MD 43 }; 44 45 struct vdso_timekeep { 46 uint32_t tk_ver; 47 uint32_t tk_enabled; 48 uint32_t tk_current; 49 struct vdso_timehands tk_th[]; 50 }; 51 52 #define VDSO_TK_CURRENT_BUSY 0xffffffff 53 #define VDSO_TK_VER_1 0x1 54 #define VDSO_TK_VER_CURR VDSO_TK_VER_1 55 #define VDSO_TH_ALGO_1 0x1 56 #define VDSO_TH_ALGO_2 0x2 57 #define VDSO_TH_ALGO_3 0x3 58 #define VDSO_TH_ALGO_4 0x4 59 60 struct vdso_fxrng_generation_1 { 61 uint32_t fx_vdso_version; /* 1 */ 62 uint32_t fx_generation32; 63 uint64_t _fx_reserved; 64 }; 65 _Static_assert(sizeof(struct vdso_fxrng_generation_1) == 16, ""); 66 #define vdso_fxrng_generation vdso_fxrng_generation_1 67 68 /* fx_vdso_version values: */ 69 #define VDSO_FXRNG_VER_1 0x1 70 #define VDSO_FXRNG_VER_CURR VDSO_FXRNG_VER_1 71 72 #ifndef _KERNEL 73 74 struct timespec; 75 struct timeval; 76 struct timezone; 77 78 int __vdso_clock_gettime(clockid_t clock_id, struct timespec *ts); 79 int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz); 80 int __vdso_gettc(const struct vdso_timehands *vdso_th, u_int *tc); 81 int __vdso_gettimekeep(struct vdso_timekeep **tk); 82 83 #endif 84 85 #ifdef _KERNEL 86 87 struct timecounter; 88 89 struct vdso_sv_tk { 90 int sv_timekeep_off; 91 int sv_timekeep_curr; 92 uint32_t sv_timekeep_gen; 93 }; 94 95 #ifdef RANDOM_FENESTRASX 96 void fxrng_push_seed_generation(uint64_t gen); 97 #endif 98 void timekeep_push_vdso(void); 99 100 uint32_t tc_fill_vdso_timehands(struct vdso_timehands *vdso_th); 101 102 /* 103 * The cpu_fill_vdso_timehands() function should fill MD-part of the 104 * struct vdso_timehands, which is both machine- and 105 * timecounter-depended. The return value should be 1 if fast 106 * userspace timecounter is enabled by hardware, and 0 otherwise. The 107 * global sysctl enable override is handled by machine-independed code 108 * after cpu_fill_vdso_timehands() call is made. 109 */ 110 uint32_t cpu_fill_vdso_timehands(struct vdso_timehands *vdso_th, 111 struct timecounter *tc); 112 113 struct vdso_sv_tk *alloc_sv_tk(void); 114 115 #define VDSO_TH_NUM 4 116 117 #ifdef COMPAT_FREEBSD32 118 119 /* 120 * i386 is the only arch with a 32 bit time_t. 121 */ 122 struct bintime32 { 123 #if defined(__amd64__) 124 uint32_t sec; 125 #else 126 uint64_t sec; 127 #endif 128 uint32_t frac[2]; 129 }; 130 131 struct vdso_timehands32 { 132 uint32_t th_algo; 133 uint32_t th_gen; 134 uint32_t th_scale[2]; 135 uint32_t th_offset_count; 136 uint32_t th_counter_mask; 137 struct bintime32 th_offset; 138 struct bintime32 th_boottime; 139 VDSO_TIMEHANDS_MD32 140 }; 141 142 struct vdso_timekeep32 { 143 uint32_t tk_ver; 144 uint32_t tk_enabled; 145 uint32_t tk_current; 146 struct vdso_timehands32 tk_th[]; 147 }; 148 149 uint32_t tc_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32); 150 uint32_t cpu_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32, 151 struct timecounter *tc); 152 struct vdso_sv_tk *alloc_sv_tk_compat32(void); 153 154 #endif 155 #endif 156 157 #endif 158