1 /* $OpenBSD: gdt.c,v 1.26 2018/02/21 19:24:15 guenther Exp $ */
2 /* $NetBSD: gdt.c,v 1.1 2003/04/26 18:39:28 fvdl 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 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/mutex.h>
36
37 #include <uvm/uvm_extern.h>
38
39 #include <machine/tss.h>
40 #include <machine/pcb.h>
41
42 /*
43 * Load appropriate gdt descriptor; we better be running on *ci
44 */
45 void
gdt_init_cpu(struct cpu_info * ci)46 gdt_init_cpu(struct cpu_info *ci)
47 {
48 struct region_descriptor region;
49
50 set_sys_segment(GDT_ADDR_SYS(ci->ci_gdt, GPROC0_SEL), ci->ci_tss,
51 sizeof (struct x86_64_tss)-1, SDT_SYS386TSS, SEL_KPL, 0);
52
53 setregion(®ion, ci->ci_gdt, GDT_SIZE - 1);
54 lgdt(®ion);
55 ltr(GSYSSEL(GPROC0_SEL, SEL_KPL));
56 }
57