iopb.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 
   27 /*
   28  * HISTORY
   29  * $Log:        iopb.h,v $
   30  * Revision 2.4  93/09/01  11:32:45  mrt
   31  *      Support for 64k bit io bitmaps.
   32  *      [93/08/19            rvb]
   33  * 
   34  * Revision 2.3  91/05/14  16:10:04  mrt
   35  *      Correcting copyright
   36  * 
   37  * Revision 2.2  91/05/08  12:38:46  dbg
   38  *      Created.
   39  *      [91/03/21            dbg]
   40  * 
   41  */
   42 
   43 #ifndef _I386_IOPB_H_
   44 #define _I386_IOPB_H_
   45 
   46 #include <i386/tss.h>
   47 #include <kern/queue.h>
   48 
   49 /*
   50  * IO permission bitmap.
   51  *
   52  * Allows only IO ports 0 .. 0x3ff: for ISA machines.
   53  */
   54 
   55 #define iopb_howmany(a,b)       (((a)+(b)-1)/(b))
   56 
   57 #define IOPB_MAX        0xffff          /* ISA bus allows ports 0..3ff */
   58                                         /* but accelerator cards are funky */
   59 #define IOPB_BYTES      (iopb_howmany(IOPB_MAX+1,8))
   60 
   61 typedef unsigned char   isa_iopb[IOPB_BYTES];
   62 
   63 /*
   64  * An IO permission map is a task segment with an IO permission bitmap.
   65  */
   66 
   67 struct iopb_tss {
   68         struct i386_tss tss;            /* task state segment */
   69         isa_iopb        bitmap;         /* bitmap of mapped IO ports */
   70         unsigned int    barrier;        /* bitmap barrier for CPU slop */
   71         queue_head_t    io_port_list;   /* list of mapped IO ports */
   72         int             iopb_desc[2];   /* descriptor for this TSS */
   73 };
   74 
   75 typedef struct iopb_tss *iopb_tss_t;
   76 
   77 #endif  /* _I386_IOPB_H_ */
   78

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FreeBSD/Linux Kernel Cross Reference sys/i386/iopb.h

FreeBSD/Linux Kernel Cross Reference
sys/i386/iopb.h