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Annotation of XNU/osfmk/i386/iopb.h, revision 1.1.1.1

1.1       root        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  [email protected]
                     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_ */

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