osfmk/i386/iopb.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56
  57 /*
  58  */
  59
  60 #ifndef _I386_IOPB_H_
  61 #define _I386_IOPB_H_
  62
  63 #include <i386/tss.h>
  64 #include <kern/queue.h>
  65
  66 /*
  67  * IO permission bitmap.
  68  *
  69  * Allows only IO ports 0 .. 0xffff: for ISA machines.
  70  */
  71
  72 #define iopb_howmany(a,b)       (((a)+(b)-1)/(b))
  73
  74 #define IOPB_MAX        0xffff          /* x86 allows ports 0..ffff */
  75 #define IOPB_BYTES      (iopb_howmany(IOPB_MAX+1,8))
  76
  77 typedef unsigned char   isa_iopb[IOPB_BYTES];
  78
  79 /*
  80  * An IO permission map is a task segment with an IO permission bitmap.
  81  */
  82
  83 struct iopb_tss {
  84         struct i386_tss tss;            /* task state segment */
  85         isa_iopb        bitmap;         /* bitmap of mapped IO ports */
  86         unsigned int    barrier;        /* bitmap barrier for CPU slop */
  87         queue_head_t    io_port_list;   /* list of mapped IO ports */
  88         int             iopb_desc[2];   /* descriptor for this TSS */
  89 };
  90
  91 typedef struct iopb_tss *iopb_tss_t;
  92
  93 #endif  /* _I386_IOPB_H_ */