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      1 /*	$NetBSD: gdt.h,v 1.1 2021/04/30 15:37:05 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by John T. Kohl and Charles M. Hannum.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _X86_GDT_H_
     33 #define _X86_GDT_H_
     34 
     35 #if !defined(_LOCORE)
     36 
     37 struct cpu_info;
     38 void gdt_init(void);
     39 void gdt_init_cpu(struct cpu_info *);
     40 void gdt_alloc_cpu(struct cpu_info *);
     41 
     42 #ifdef _LP64
     43 struct x86_64_tss;
     44 int tss_alloc(struct x86_64_tss *);
     45 #else
     46 struct i386tss;
     47 int tss_alloc(const struct i386tss *);
     48 #endif
     49 
     50 void tss_free(int);
     51 int ldt_alloc(void *, size_t);
     52 void ldt_free(int);
     53 
     54 #endif /* LOCORE */
     55 
     56 
     57 #ifndef MAXGDTSIZ
     58 # define MAXGDTSIZ		65536	/* XXX: see <x86/pmap.h> */
     59 #endif
     60 
     61 #ifndef MAX_USERLDT_SIZE
     62 # define MAX_USERLDT_SIZE	65536	/* XXX: see <x86/pmap.h> */
     63 #endif
     64 
     65 #define MAX_USERLDT_SLOTS	(int)(MAX_USERLDT_SIZE / sizeof(union descriptor))
     66 
     67 #endif /* _X86_GDT_H_ */
     68