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	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_ */