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