lib/libcaps/i386/td_switch.c

   1 /*
   2  * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $DragonFly: src/lib/libcaps/i386/td_switch.c,v 1.2 2004/07/29 08:55:02 dillon Exp $
  27  */
  28 #include <sys/cdefs.h>                  /* for __dead2 needed by thread.h */
  29 #include "libcaps/thread.h"
  30 #include <sys/thread.h>
  31 #include "libcaps/globaldata.h"         /* for curthread */
  32
  33 void cpu_lwkt_switch(struct thread *);
  34 void cpu_kthread_start(struct thread *);
  35 void cpu_exit_switch(struct thread *);
  36
  37 void
  38 cpu_init_thread(struct thread *td)
  39 {
  40     td->td_sp = td->td_kstack + td->td_kstack_size - sizeof(void *);
  41     td->td_switch = cpu_lwkt_switch;
  42 }
  43
  44 void
  45 cpu_set_thread_handler(thread_t td, void (*rfunc)(void), void (*func)(void *), void *arg)
  46 {
  47         td->td_sp -= sizeof(void *);
  48         *(void **)td->td_sp = arg;      /* argument to function */
  49         td->td_sp -= sizeof(void *);
  50         *(void **)td->td_sp = rfunc;    /* exit function on return */
  51         td->td_sp -= sizeof(void *);
  52         *(void **)td->td_sp = func;     /* started by cpu_kthread_start */
  53         td->td_sp -= sizeof(void *);
  54         *(void **)td->td_sp = cpu_kthread_start; /* bootstrap */
  55         td->td_switch = cpu_lwkt_switch;
  56 }
  57
  58 void
  59 cpu_thread_exit(void)
  60 {
  61         curthread->td_switch = cpu_exit_switch;
  62         lwkt_switch();
  63         panic("cpu_exit");
  64 }