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Annotation of XNU/osfmk/i386/mp_desc.h, revision 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_MP_DESC_H_
        !            55: #define        _I386_MP_DESC_H_
        !            56: 
        !            57: #include <cpus.h>
        !            58: #include <mach_kdb.h>
        !            59: 
        !            60: /*
        !            61:  * Multiprocessor i386/i486 systems use a separate copy of the
        !            62:  * GDT, IDT, LDT, and kernel TSS per processor.  The first three
        !            63:  * are separate to avoid lock contention: the i386 uses locked
        !            64:  * memory cycles to access the descriptor tables.  The TSS is
        !            65:  * separate since each processor needs its own kernel stack,
        !            66:  * and since using a TSS marks it busy.
        !            67:  */
        !            68: 
        !            69: #include <i386/seg.h>
        !            70: #include <i386/tss.h>
        !            71: 
        !            72: /*
        !            73:  * The descriptor tables are together in a structure
        !            74:  * allocated one per processor (except for the boot processor).
        !            75:  * Note that dbtss could be conditionalized on MACH_KDB, but
        !            76:  * doing so increases misconfiguration risk.
        !            77:  */
        !            78: struct mp_desc_table {
        !            79:        struct fake_descriptor  idt[IDTSZ];     /* IDT */
        !            80:        struct fake_descriptor  gdt[GDTSZ];     /* GDT */
        !            81:        struct fake_descriptor  ldt[LDTSZ];     /* LDT */
        !            82:        struct i386_tss         ktss;
        !            83:        struct i386_tss         dbtss;
        !            84: };
        !            85: 
        !            86: /*
        !            87:  * They are pointed to by a per-processor array.
        !            88:  */
        !            89: extern struct mp_desc_table    *mp_desc_table[NCPUS];
        !            90: 
        !            91: /*
        !            92:  * The kernel TSS gets its own pointer.
        !            93:  */
        !            94: extern struct i386_tss         *mp_ktss[NCPUS];
        !            95: #if    MACH_KDB
        !            96: extern struct i386_tss         *mp_dbtss[NCPUS];
        !            97: #endif /* MACH_KDB */
        !            98: 
        !            99: /*
        !           100:  * So does the GDT and IDT.
        !           101:  */
        !           102: extern struct fake_descriptor  *mp_gdt[NCPUS];
        !           103: extern struct fake_descriptor  *mp_idt[NCPUS];
        !           104: 
        !           105: 
        !           106: /*
        !           107:  * Each CPU calls this routine to set up its descriptor tables.
        !           108:  */
        !           109: 
        !           110: extern struct mp_desc_table *  mp_desc_init(
        !           111:                                        int             cpu);
        !           112: extern void                    interrupt_stack_alloc(void);
        !           113: 
        !           114: #endif /* _I386_MP_DESC_H_ */

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