osfmk/i386/iopb.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * @OSF_COPYRIGHT@
  25  */
  26 /*
  27  * Mach Operating System
  28  * Copyright (c) 1991,1990 Carnegie Mellon University
  29  * All Rights Reserved.
  30  *
  31  * Permission to use, copy, modify and distribute this software and its
  32  * documentation is hereby granted, provided that both the copyright
  33  * notice and this permission notice appear in all copies of the
  34  * software, derivative works or modified versions, and any portions
  35  * thereof, and that both notices appear in supporting documentation.
  36  *
  37  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  38  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  39  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  40  *
  41  * Carnegie Mellon requests users of this software to return to
  42  *
  43  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  44  *  School of Computer Science
  45  *  Carnegie Mellon University
  46  *  Pittsburgh PA 15213-3890
  47  *
  48  * any improvements or extensions that they make and grant Carnegie Mellon
  49  * the rights to redistribute these changes.
  50  */
  51
  52 /*
  53  */
  54
  55 #ifndef _I386_IOPB_H_
  56 #define _I386_IOPB_H_
  57
  58 #include <i386/tss.h>
  59 #include <kern/queue.h>
  60
  61 /*
  62  * IO permission bitmap.
  63  *
  64  * Allows only IO ports 0 .. 0xffff: for ISA machines.
  65  */
  66
  67 #define iopb_howmany(a,b)       (((a)+(b)-1)/(b))
  68
  69 #define IOPB_MAX        0xffff          /* x86 allows ports 0..ffff */
  70 #define IOPB_BYTES      (iopb_howmany(IOPB_MAX+1,8))
  71
  72 typedef unsigned char   isa_iopb[IOPB_BYTES];
  73
  74 /*
  75  * An IO permission map is a task segment with an IO permission bitmap.
  76  */
  77
  78 struct iopb_tss {
  79         struct i386_tss tss;            /* task state segment */
  80         isa_iopb        bitmap;         /* bitmap of mapped IO ports */
  81         unsigned int    barrier;        /* bitmap barrier for CPU slop */
  82         queue_head_t    io_port_list;   /* list of mapped IO ports */
  83         int             iopb_desc[2];   /* descriptor for this TSS */
  84 };
  85
  86 typedef struct iopb_tss *iopb_tss_t;
  87
  88 #endif  /* _I386_IOPB_H_ */