Return to gdt.h CVS log

Up to [local] / sys / arch / i386 / include

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