osfmk/kern/syscall_emulation.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53 /*
  54  */
  55
  56 #ifndef _KERN_SYSCALL_EMULATION_H_
  57 #define _KERN_SYSCALL_EMULATION_H_
  58
  59 #ifndef ASSEMBLER
  60 #include <kern/kern_types.h>
  61 #include <mach/machine/vm_types.h>
  62 #include <kern/lock.h>
  63
  64 typedef vm_offset_t     eml_routine_t;
  65
  66 typedef struct eml_dispatch {
  67         decl_mutex_data(,lock)          /* lock for reference count */
  68         int             ref_count;      /* reference count */
  69         int             disp_count;     /* count of entries in vector */
  70         int             disp_min;       /* index of lowest entry in vector */
  71         eml_routine_t   disp_vector[1]; /* first entry in array of dispatch */
  72                                         /* routines (array has disp_count
  73                                            elements) */
  74 } *eml_dispatch_t;
  75
  76 #define EML_ROUTINE_NULL        (eml_routine_t)0
  77 #define EML_DISPATCH_NULL       (eml_dispatch_t)0
  78
  79 #define EML_SUCCESS             (0)
  80
  81 #define EML_MOD                 (err_kern|err_sub(2))
  82 #define EML_BAD_TASK            (EML_MOD|0x0001)
  83 #define EML_BAD_CNT             (EML_MOD|0x0002)
  84
  85 /* Per-task initialization */
  86 extern void     eml_init(void);
  87
  88 /* Take reference on common task emulation vector */
  89 extern void     eml_task_reference(
  90                         task_t  new_task,
  91                         task_t  parent_task);
  92
  93 /* Deallocate reference on common task emulation vector */
  94 extern void     eml_task_deallocate(
  95                         task_t  task);
  96
  97 #endif  /* ASSEMBLER */
  98
  99 #endif  /* _KERN_SYSCALL_EMULATION_H_ */