sys/platform/pc64/x86_64/spinlock.s

   1 /*-
   2  * Copyright (c) 2003 Matthew Dillon.
   3  * Copyright (c) 2008 The DragonFly Project.
   4  * All Rights Reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. The name of the developer may NOT be used to endorse or promote products
  12  *    derived from this software without specific prior written permission.
  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  * $FreeBSD: src/sys/i386/i386/simplelock.s,v 1.11.2.2 2003/02/04 20:55:28 jhb Exp $
  27  */
  28
  29 #include <machine/asmacros.h>                   /* miscellaneous macros */
  30 #include <machine/lock.h>
  31
  32 /*
  33  * The spinlock routines may only be used for low level debugging, like
  34  * kernel printfs, and when no other option is available such as situations
  35  * relating to hardware interrupt masks.  Spinlock routines should not be
  36  * used in interrupt service routines or in any other situation.
  37  *
  38  * NOTE: for UP the spinlock routines still disable/restore interrupts
  39  */
  40 ENTRY(spin_lock_deprecated)
  41         movl    4(%esp),%edx
  42         SPIN_LOCK((%edx))               /* note: %eax, %ecx tromped */
  43         ret
  44
  45 ENTRY(spin_unlock_deprecated)
  46         movl    4(%esp),%edx
  47         SPIN_UNLOCK((%edx))             /* note: %eax, %ecx tromped */
  48         ret
  49
  50 NON_GPROF_ENTRY(spin_lock_np)
  51         movl    4(%esp),%edx
  52         SPIN_LOCK((%edx))               /* note: %eax, %ecx tromped */
  53         NON_GPROF_RET
  54
  55 NON_GPROF_ENTRY(spin_unlock_np)
  56         movl    4(%esp), %edx           /* get the address of the lock */
  57         SPIN_UNLOCK((%edx))
  58         NON_GPROF_RET
  59
  60 /*
  61  * Auxillary convenience routines.  Note that these functions disable and
  62  * restore interrupts as well, on SMP, as performing spin locking functions.
  63  */
  64 NON_GPROF_ENTRY(imen_lock)
  65         SPIN_LOCK(imen_spinlock)
  66         NON_GPROF_RET
  67
  68 NON_GPROF_ENTRY(imen_unlock)
  69         SPIN_UNLOCK(imen_spinlock)
  70         NON_GPROF_RET
  71
  72 NON_GPROF_ENTRY(clock_lock)
  73         SPIN_LOCK(clock_spinlock)
  74         NON_GPROF_RET
  75
  76 NON_GPROF_ENTRY(clock_unlock)
  77         SPIN_UNLOCK(clock_spinlock)
  78         NON_GPROF_RET
  79
  80 NON_GPROF_ENTRY(com_lock)
  81         SPIN_LOCK(com_spinlock)
  82         NON_GPROF_RET
  83
  84 NON_GPROF_ENTRY(com_unlock)
  85         SPIN_UNLOCK(com_spinlock)
  86         NON_GPROF_RET