The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/userret.h

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    1 /*      $NetBSD: userret.h,v 1.19.4.1 2009/03/02 20:06:57 snj Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1998, 2000, 2003, 2006, 2008 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Charles M. Hannum, and Andrew Doran.
    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 /*-
   33  * Copyright (c) 1990 The Regents of the University of California.
   34  * All rights reserved.
   35  *
   36  * This code is derived from software contributed to Berkeley by
   37  * William Jolitz.
   38  *
   39  * Redistribution and use in source and binary forms, with or without
   40  * modification, are permitted provided that the following conditions
   41  * are met:
   42  * 1. Redistributions of source code must retain the above copyright
   43  *    notice, this list of conditions and the following disclaimer.
   44  * 2. Redistributions in binary form must reproduce the above copyright
   45  *    notice, this list of conditions and the following disclaimer in the
   46  *    documentation and/or other materials provided with the distribution.
   47  * 3. Neither the name of the University nor the names of its contributors
   48  *    may be used to endorse or promote products derived from this software
   49  *    without specific prior written permission.
   50  *
   51  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   52  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   53  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   54  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   55  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   56  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   57  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   59  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   60  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   61  * SUCH DAMAGE.
   62  *
   63  */
   64 
   65 #ifndef _SYS_USERRET_H_
   66 #define _SYS_USERRET_H_
   67 
   68 #include <sys/lockdebug.h>
   69 #include <sys/intr.h>
   70 
   71 /*
   72  * Define the MI code needed before returning to user mode, for
   73  * trap and syscall.
   74  */
   75 static __inline void
   76 mi_userret(struct lwp *l)
   77 {
   78         struct proc *p = l->l_proc;
   79 #ifndef __HAVE_PREEMPTION
   80         struct cpu_info *ci;
   81 #endif
   82 
   83         /*
   84          * Handle "exceptional" events: pending signals, stop/exit actions,
   85          * etc.  Note that the event must be flagged BEFORE any AST is
   86          * posted as we are reading unlocked.
   87          */
   88 #ifdef __HAVE_PREEMPTION
   89         if (__predict_false(((l->l_flag & LW_USERRET) | p->p_timerpend) != 0))
   90                 lwp_userret(l);
   91         l->l_kpriority = false;
   92         cpu_set_curpri(l->l_priority);  /* XXX this needs to die */
   93 #else
   94         ci = l->l_cpu;
   95         if (((l->l_flag & LW_USERRET) | p->p_timerpend |
   96             ci->ci_data.cpu_softints) != 0) {
   97                 lwp_userret(l);
   98                 ci = l->l_cpu;
   99         }
  100         l->l_kpriority = false;
  101         ci->ci_schedstate.spc_curpriority = l->l_priority;
  102 #endif
  103 
  104         LOCKDEBUG_BARRIER(NULL, 0);
  105         KASSERT(l->l_nopreempt == 0);
  106 }
  107 
  108 #endif  /* !_SYS_USERRET_H_ */

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