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Annotation of Gnu-Mach/i386/util/cpu.h, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Copyright (c) 1995-1994 The University of Utah and
                      3:  * the Computer Systems Laboratory at the University of Utah (CSL).
                      4:  * All rights reserved.
                      5:  *
                      6:  * Permission to use, copy, modify and distribute this software is hereby
                      7:  * granted provided that (1) source code retains these copyright, permission,
                      8:  * and disclaimer notices, and (2) redistributions including binaries
                      9:  * reproduce the notices in supporting documentation, and (3) all advertising
                     10:  * materials mentioning features or use of this software display the following
                     11:  * acknowledgement: ``This product includes software developed by the
                     12:  * Computer Systems Laboratory at the University of Utah.''
                     13:  *
                     14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
                     15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
                     16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     17:  *
                     18:  * CSL requests users of this software to return to [email protected] any
                     19:  * improvements that they make and grant CSL redistribution rights.
                     20:  *
                     21:  *      Author: Bryan Ford, University of Utah CSL
                     22:  */
                     23: #ifndef _I386_UTIL_CPU_H_
                     24: #define _I386_UTIL_CPU_H_
                     25: 
                     26: #include <mach/machine/tss.h>
                     27: 
                     28: #include "config.h"
                     29: #include "gdt.h"
                     30: #include "ldt.h"
                     31: #include "idt.h"
                     32: 
                     33: /*
                     34:  * Multiprocessor i386/i486 systems use a separate copy of the
                     35:  * GDT, IDT, LDT, and kernel TSS per processor.  The first three
                     36:  * are separate to avoid lock contention: the i386 uses locked
                     37:  * memory cycles to access the descriptor tables.  The TSS is
                     38:  * separate since each processor needs its own kernel stack,
                     39:  * and since using a TSS marks it busy.
                     40:  */
                     41: 
                     42: /* This structure holds the processor tables for this cpu.  */
                     43: struct cpu_tables
                     44: {
                     45:        struct i386_gate        idt[IDTSZ];
                     46:        struct i386_descriptor  gdt[GDTSZ];
                     47: #ifdef ENABLE_KERNEL_LDT
                     48:        struct i386_descriptor  ldt[LDTSZ];
                     49: #endif
                     50: #ifdef ENABLE_KERNEL_TSS
                     51:        struct i386_tss         tss;
                     52: #endif
                     53: };
                     54: 
                     55: #include_next "cpu.h"
                     56: 
                     57: #endif _I386_UTIL_CPU_H_

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