osfmk/i386/iopb.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 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
  57 #ifndef _I386_IOPB_H_
  58 #define _I386_IOPB_H_
  59
  60 #include <i386/tss.h>
  61 #include <kern/queue.h>
  62
  63 /*
  64  * IO permission bitmap.
  65  *
  66  * Allows only IO ports 0 .. 0xffff: for ISA machines.
  67  */
  68
  69 #define iopb_howmany(a,b)       (((a)+(b)-1)/(b))
  70
  71 #define IOPB_MAX        0xffff          /* x86 allows ports 0..ffff */
  72 #define IOPB_BYTES      (iopb_howmany(IOPB_MAX+1,8))
  73
  74 typedef unsigned char   isa_iopb[IOPB_BYTES];
  75
  76 /*
  77  * An IO permission map is a task segment with an IO permission bitmap.
  78  */
  79
  80 struct iopb_tss {
  81         struct i386_tss tss;            /* task state segment */
  82         isa_iopb        bitmap;         /* bitmap of mapped IO ports */
  83         unsigned int    barrier;        /* bitmap barrier for CPU slop */
  84         queue_head_t    io_port_list;   /* list of mapped IO ports */
  85         int             iopb_desc[2];   /* descriptor for this TSS */
  86 };
  87
  88 typedef struct iopb_tss *iopb_tss_t;
  89
  90 #endif  /* _I386_IOPB_H_ */