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 32 #include <sys/timetc.h> 33 34 #include <machine/clock.h> 35 #include <machine/cpufunc.h> 36 #include <machine/stack.h> 37 #include <machine/vmparam.h> 38 39 static inline bool 40 kcsan_md_unsupported(vm_offset_t addr) 41 { 42 return false; 43 } 44 45 static inline bool 46 kcsan_md_is_avail(void) 47 { 48 return true; 49 } 50 51 static inline void 52 kcsan_md_disable_intrs(uint64_t *state) 53 { 54 55 *state = intr_disable(); 56 } 57 58 static inline void 59 kcsan_md_enable_intrs(uint64_t *state) 60 { 61 62 intr_restore(*state); 63 } 64 65 static inline void 66 kcsan_md_delay(uint64_t us) 67 { 68 /* 69 * Only call DELAY if not using the early delay code. The i8254 70 * early delay function may cause us to recurse on a spin lock 71 * leading to a panic. 72 */ 73 if ((tsc_is_invariant && tsc_freq != 0) || 74 timecounter->tc_quality > 0) 75 DELAY(us); 76 } 77 78 static void 79 kcsan_md_unwind(void) 80 { 81 } 82