mp_desc.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1993,1991,1990 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:        mp_desc.h,v $
   30  * Revision 2.4  93/11/17  16:36:57  dbg
   31  *      Added ANSI function prototypes.
   32  *      [93/11/03            dbg]
   33  * 
   34  * Revision 2.3  91/05/14  16:12:24  mrt
   35  *      Correcting copyright
   36  * 
   37  * Revision 2.2  91/05/08  12:39:51  dbg
   38  *      Created.
   39  *      [91/03/21            dbg]
   40  * 
   41  */
   42 
   43 #ifndef _I386_MP_DESC_H_
   44 #define _I386_MP_DESC_H_
   45 
   46 #include <cpus.h>
   47 
   48 /*
   49  * Multiprocessor i386/i486 systems use a separate copy of the
   50  * GDT, IDT, LDT, and kernel TSS per processor.  The first three
   51  * are separate to avoid lock contention: the i386 uses locked
   52  * memory cycles to access the descriptor tables.  The TSS is
   53  * separate since each processor needs its own kernel stack,
   54  * and since using a TSS marks it busy.
   55  */
   56 
   57 #include <i386/seg.h>
   58 #include <i386/tss.h>
   59 
   60 /*
   61  * The descriptor tables are together in a structure
   62  * allocated one per processor (except for the boot processor).
   63  */
   64 struct mp_desc_table {
   65         struct fake_descriptor  idt[IDTSZ];     /* IDT */
   66         struct fake_descriptor  gdt[GDTSZ];     /* GDT */
   67         struct fake_descriptor  ldt[LDTSZ];     /* LDT */
   68         struct i386_tss         ktss;
   69 };
   70 
   71 /*
   72  * They are pointed to by a per-processor array.
   73  */
   74 extern struct mp_desc_table     *mp_desc_table[NCPUS];
   75 
   76 /*
   77  * The kernel TSS gets its own pointer.
   78  */
   79 extern struct i386_tss          *mp_ktss[NCPUS];
   80 
   81 /*
   82  * So does the GDT.
   83  */
   84 extern struct fake_descriptor   *mp_gdt[NCPUS];
   85 
   86 
   87 /*
   88  * Each CPU calls this routine to set up its descriptor tables.
   89  */
   90 extern struct mp_desc_table *   mp_desc_init(int cpu);
   91 
   92 /*
   93  * Allocate all of the interrupt stacks.
   94  */
   95 extern void     interrupt_stack_alloc(void);
   96 
   97 #endif  /* _I386_MP_DESC_H_ */

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

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