osfmk/i386/iopb.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50
  51 /*
  52  */
  53
  54 #ifndef _I386_IOPB_H_
  55 #define _I386_IOPB_H_
  56
  57 #include <i386/tss.h>
  58 #include <kern/queue.h>
  59
  60 /*
  61  * IO permission bitmap.
  62  *
  63  * Allows only IO ports 0 .. 0xffff: for ISA machines.
  64  */
  65
  66 #define iopb_howmany(a,b)       (((a)+(b)-1)/(b))
  67
  68 #define IOPB_MAX        0xffff          /* x86 allows ports 0..ffff */
  69 #define IOPB_BYTES      (iopb_howmany(IOPB_MAX+1,8))
  70
  71 typedef unsigned char   isa_iopb[IOPB_BYTES];
  72
  73 /*
  74  * An IO permission map is a task segment with an IO permission bitmap.
  75  */
  76
  77 struct iopb_tss {
  78         struct i386_tss tss;            /* task state segment */
  79         isa_iopb        bitmap;         /* bitmap of mapped IO ports */
  80         unsigned int    barrier;        /* bitmap barrier for CPU slop */
  81         queue_head_t    io_port_list;   /* list of mapped IO ports */
  82         int             iopb_desc[2];   /* descriptor for this TSS */
  83 };
  84
  85 typedef struct iopb_tss *iopb_tss_t;
  86
  87 #endif  /* _I386_IOPB_H_ */