1 /* $NetBSD: csan.h,v 1.2 2019/11/06 06:57:22 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2019 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Maxime Villard. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #include <sys/timetc.h> 35 36 #include <machine/clock.h> 37 #include <machine/cpufunc.h> 38 #include <machine/stack.h> 39 #include <machine/vmparam.h> 40 41 static inline bool 42 kcsan_md_unsupported(vm_offset_t addr) 43 { 44 return false; 45 } 46 47 static inline bool 48 kcsan_md_is_avail(void) 49 { 50 return true; 51 } 52 53 static inline void 54 kcsan_md_disable_intrs(uint64_t *state) 55 { 56 57 *state = intr_disable(); 58 } 59 60 static inline void 61 kcsan_md_enable_intrs(uint64_t *state) 62 { 63 64 intr_restore(*state); 65 } 66 67 static inline void 68 kcsan_md_delay(uint64_t us) 69 { 70 /* 71 * Only call DELAY if not using the early delay code. The i8254 72 * early delay function may cause us to recurse on a spin lock 73 * leading to a panic. 74 */ 75 if ((tsc_is_invariant && tsc_freq != 0) || 76 timecounter->tc_quality > 0) 77 DELAY(us); 78 } 79 80 static void 81 kcsan_md_unwind(void) 82 { 83 } 84