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Annotation of XNU/osfmk/i386/mp_desc.h, revision 1.1.1.1

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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