csan.h

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    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 }

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FreeBSD/Linux Kernel Cross Reference sys/amd64/include/csan.h

FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/csan.h