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

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * @OSF_COPYRIGHT@
     */
    /* 
     * Mach Operating System
     * Copyright (c) 1991,1990 Carnegie Mellon University
     * All Rights Reserved.
     * 
     * Permission to use, copy, modify and distribute this software and its
     * documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    
    /*
     */
    
    #ifndef _I386_MP_DESC_H_
    #define _I386_MP_DESC_H_
    
    #include <cpus.h>
    #include <mach_kdb.h>
    
    /*
     * Multiprocessor i386/i486 systems use a separate copy of the
     * GDT, IDT, LDT, and kernel TSS per processor.  The first three
     * are separate to avoid lock contention: the i386 uses locked
     * memory cycles to access the descriptor tables.  The TSS is
     * separate since each processor needs its own kernel stack,
     * and since using a TSS marks it busy.
     */
    
    #include <i386/seg.h>
    #include <i386/tss.h>
    
    /*
     * The descriptor tables are together in a structure
     * allocated one per processor (except for the boot processor).
     * Note that dbtss could be conditionalized on MACH_KDB, but
     * doing so increases misconfiguration risk.
     */
    struct mp_desc_table {
            struct fake_descriptor  idt[IDTSZ];     /* IDT */
            struct fake_descriptor  gdt[GDTSZ];     /* GDT */
            struct fake_descriptor  ldt[LDTSZ];     /* LDT */
            struct i386_tss         ktss;
            struct i386_tss         dbtss;
    };
    
    /*
     * They are pointed to by a per-processor array.
     */
    extern struct mp_desc_table     *mp_desc_table[NCPUS];
    
    /*
     * The kernel TSS gets its own pointer.
     */
    extern struct i386_tss          *mp_ktss[NCPUS];
    #if     MACH_KDB
    extern struct i386_tss          *mp_dbtss[NCPUS];
   #endif  /* MACH_KDB */
   
   /*
    * So does the GDT and IDT.
    */
   extern struct fake_descriptor   *mp_gdt[NCPUS];
   extern struct fake_descriptor   *mp_idt[NCPUS];
   extern struct fake_descriptor   *mp_ldt[NCPUS];
   
   
   /*
    * Each CPU calls this routine to set up its descriptor tables.
    */
   
   extern struct mp_desc_table *   mp_desc_init(
                                           int             cpu);
   extern void                     interrupt_stack_alloc(void);
   
   #endif  /* _I386_MP_DESC_H_ */

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