sys/sys/upcall.h

   1 /*
   2  * Copyright (c) 2003,2004 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/sys/upcall.h,v 1.11 2006/09/10 21:35:11 dillon Exp $
  35  */
  36
  37 #ifndef _SYS_UPCALL_H_
  38 #define _SYS_UPCALL_H_
  39
  40 struct thread;
  41 struct lwp;
  42
  43 typedef void (*upcall_func_t)(void *);
  44
  45 struct upcall {
  46         int     upc_magic;
  47         int     upc_critoff;            /* offset of crit_count in uthread */
  48         int     upc_pending;            /* must follow crit_count */
  49         struct thread *upc_uthread;     /* pointer to user thread (opaque) */
  50 };
  51
  52 #define UPCALL_MAGIC    0x55504331
  53 #define UPCALL_MAXCOUNT 32
  54
  55 #define UPC_CONTROL_DISPATCH            1
  56 #define UPC_CONTROL_NEXT                2
  57 #define UPC_CONTROL_DELETE              3
  58 #define UPC_CONTROL_POLL                4
  59 #define UPC_CONTROL_POLLANDCLEAR        5
  60 #define UPC_CONTROL_WAIT                6
  61
  62 #define UPC_CRITADD                     32      /* NOTE! same as TDPRI_CRIT */
  63 #define UPC_RESERVED                    32      /* # of reserved id's */
  64
  65 #if defined(_KERNEL)
  66 /*
  67  * Kernel protoypes
  68  */
  69
  70 struct vmspace;
  71
  72 void upc_release(struct vmspace *vm, struct lwp *lp);
  73 void postupcall(struct lwp *lp);
  74
  75 #else
  76 /*
  77  * Userland prototypes
  78  */
  79 int upc_register(struct upcall *, upcall_func_t, upcall_func_t, void *);
  80 int upc_control(int, int, void *);
  81 void upc_callused_wrapper(void *);
  82
  83 #endif
  84
  85 #endif
  86