ffa744f452
reworked by me to support 32-bit processes as well. we now keep %fs and %gs loaded with the user values while in the kernel, which means we don't need to reload them when returning to user mode.
53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
/* $NetBSD: gdt.h,v 1.7 2010/07/07 01:14:52 chs Exp $ */
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/*-
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* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by John T. Kohl and Charles M. Hannum.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LOCORE
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struct proc;
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struct pmap;
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void gdt_init(void);
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void gdt_init_cpu(struct cpu_info *);
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void gdt_reload_cpu(struct cpu_info *);
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void gdt_alloc_cpu(struct cpu_info *);
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struct x86_64_tss;
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int tss_alloc(struct x86_64_tss *);
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void tss_free(int);
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void ldt_alloc(struct pmap *, char *, size_t);
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void ldt_free(struct pmap *);
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void set_sys_gdt(int, void *, size_t, int, int, int);
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#endif
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#define MINGDTSIZ PAGE_SIZE
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#define MAXGDTSIZ 65536
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