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Annotation of sys/arch/i386/include/gdt.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: gdt.h,v 1.10 2004/06/13 21:49:16 niklas Exp $ */
                      2: /*     $NetBSD: gdt.h,v 1.7.10.6 2002/08/19 01:22:36 sommerfeld Exp $  */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
                      6:  * All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to The NetBSD Foundation
                      9:  * by John T. Kohl and Charles M. Hannum.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. All advertising materials mentioning features or use of this software
                     20:  *    must display the following acknowledgement:
                     21:  *        This product includes software developed by the NetBSD
                     22:  *        Foundation, Inc. and its contributors.
                     23:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     24:  *    contributors may be used to endorse or promote products derived
                     25:  *    from this software without specific prior written permission.
                     26:  *
                     27:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     28:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     29:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     30:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
                     31:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     32:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     33:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     34:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     35:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     36:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     37:  * POSSIBILITY OF SUCH DAMAGE.
                     38:  */
                     39:
                     40: #ifndef _LOCORE
                     41:
                     42: struct cpu_info;
                     43: struct pcb;
                     44: struct pmap;
                     45: union descriptor;
                     46:
                     47: void gdt_alloc_cpu(struct cpu_info *);
                     48: int gdt_get_slot(void);
                     49: void gdt_init(void);
                     50: void gdt_init_cpu(struct cpu_info *);
                     51: void gdt_reload_cpu(/* XXX struct cpu_info * */ void);
                     52: void ldt_alloc(struct pmap *, union descriptor *, size_t);
                     53: void ldt_free(struct pmap *);
                     54: int tss_alloc(struct pcb *);
                     55: void tss_free(int);
                     56: void setgdt(int, void *, size_t, int, int, int, int);
                     57: #endif
                     58:
                     59: /*
                     60:  * The initial GDT size (as a descriptor count), and the maximum
                     61:  * GDT size possible.
                     62:  *
                     63:  * These are actually not arbitrary.  To start with, they have to be
                     64:  * multiples of 512 and at least 512, in order to work with the
                     65:  * allocation strategy set forth by gdt_init and gdt_grow.  Then, the
                     66:  * max cannot exceed 65536 since the selector field of a descriptor is
                     67:  * just 16 bits, and used as free list link.
                     68:  */
                     69:
                     70: #define MINGDTSIZ 512
                     71: #define MAXGDTSIZ 8192