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
kcsan_md_unsupported(vm_offset_t addr)40 kcsan_md_unsupported(vm_offset_t addr)
41 {
42 return false;
43 }
44
45 static inline bool
kcsan_md_is_avail(void)46 kcsan_md_is_avail(void)
47 {
48 return true;
49 }
50
51 static inline void
kcsan_md_disable_intrs(uint64_t * state)52 kcsan_md_disable_intrs(uint64_t *state)
53 {
54
55 *state = intr_disable();
56 }
57
58 static inline void
kcsan_md_enable_intrs(uint64_t * state)59 kcsan_md_enable_intrs(uint64_t *state)
60 {
61
62 intr_restore(*state);
63 }
64
65 static inline void
kcsan_md_delay(uint64_t us)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
kcsan_md_unwind(void)79 kcsan_md_unwind(void)
80 {
81 }
82