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