/*      $NetBSD: gdt.h,v 1.1 2021/04/30 15:37:05 christos 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.
*
* 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 FOUNDATION 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 _X86_GDT_H_
#define _X86_GDT_H_

#if !defined(_LOCORE)

struct cpu_info;
void gdt_init(void);
void gdt_init_cpu(struct cpu_info *);
void gdt_alloc_cpu(struct cpu_info *);

#ifdef _LP64
struct x86_64_tss;
int tss_alloc(struct x86_64_tss *);
#else
struct i386tss;
int tss_alloc(const struct i386tss *);
#endif

void tss_free(int);
int ldt_alloc(void *, size_t);
void ldt_free(int);

#endif /* LOCORE */


#ifndef MAXGDTSIZ
# define MAXGDTSIZ              65536   /* XXX: see <x86/pmap.h> */
#endif

#ifndef MAX_USERLDT_SIZE
# define MAX_USERLDT_SIZE       65536   /* XXX: see <x86/pmap.h> */
#endif

#define MAX_USERLDT_SLOTS       (int)(MAX_USERLDT_SIZE / sizeof(union descriptor))

#endif /* _X86_GDT_H_ */