The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/ktss.c

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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  * HISTORY
   28  * $Log:        ktss.c,v $
   29  * Revision 2.5  91/05/14  16:10:37  mrt
   30  *      Correcting copyright
   31  * 
   32  * Revision 2.4  91/02/05  17:12:39  mrt
   33  *      Changed to new Mach copyright
   34  *      [91/02/01  17:35:28  mrt]
   35  * 
   36  * Revision 2.3  90/08/27  21:57:07  dbg
   37  *      New selector names from new seg.h.
   38  *      [90/07/25            dbg]
   39  * 
   40  * Revision 2.2  90/05/03  15:33:35  dbg
   41  *      Created.
   42  *      [90/02/15            dbg]
   43  * 
   44  */
   45 
   46 /*
   47  * Kernel task state segment.
   48  *
   49  * We don't use the i386 task switch mechanism.  We need a TSS
   50  * only to hold the kernel stack pointer for the current thread.
   51  *
   52  * XXX multiprocessor??
   53  */
   54 #include <i386/tss.h>
   55 #include <i386/seg.h>
   56 
   57 struct i386_tss ktss = {
   58         0,                              /* back link */
   59         0,                              /* esp0 */
   60         KERNEL_DS,                      /* ss0 */
   61         0,                              /* esp1 */
   62         0,                              /* ss1 */
   63         0,                              /* esp2 */
   64         0,                              /* ss2 */
   65         0,                              /* cr3 */
   66         0,                              /* eip */
   67         0,                              /* eflags */
   68         0,                              /* eax */
   69         0,                              /* ecx */
   70         0,                              /* edx */
   71         0,                              /* ebx */
   72         0,                              /* esp */
   73         0,                              /* ebp */
   74         0,                              /* esi */
   75         0,                              /* edi */
   76         0,                              /* es */
   77         0,                              /* cs */
   78         0,                              /* ss */
   79         0,                              /* ds */
   80         0,                              /* fs */
   81         0,                              /* gs */
   82         0,                              /* ldt */
   83         0,                              /* trace_trap */
   84         0x0FFF                          /* IO bitmap offset -
   85                                            beyond end of TSS segment,
   86                                            so no bitmap */
   87 };
   88 

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