/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This 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 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]; /* * 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_ */