source: grub-pc/trunk/fuentes/grub-core/loader/i386/bsd_pagetable.c @ 22

Last change on this file since 22 was 22, checked in by mabarracus, 4 years ago

updated version and apply net.ifnames=0 into debian/rules

File size: 3.3 KB
Line 
1/*
2 *  GRUB  --  GRand Unified Bootloader
3 *  Copyright (c) 1998  Michael Smith <msmith@freebsd.org>
4 *  Copyright (C) 2009  Free Software Foundation, Inc.
5 *
6 *  GRUB is free software: you can redistribute it and/or modify
7 *  it under the terms of the GNU General Public License as published by
8 *  the Free Software Foundation, either version 3 of the License, or
9 *  (at your option) any later version.
10 *
11 *  GRUB is distributed in the hope that it will be useful,
12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *  GNU General Public License for more details.
15 *
16 *  You should have received a copy of the GNU General Public License
17 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
18 */
19
20/* Based on the code from FreeBSD originally distributed under the
21   following terms: */
22
23/*-
24 * Copyright (c) 1998  Michael Smith <msmith@freebsd.org>
25 * All rights reserved.
26 *
27 * Redistribution and use in source and binary forms, with or without
28 * modification, are permitted provided that the following conditions
29 * are met:
30 * 1. Redistributions of source code must retain the above copyright
31 *    notice, this list of conditions and the following disclaimer.
32 * 2. Redistributions in binary form must reproduce the above copyright
33 *    notice, this list of conditions and the following disclaimer in the
34 *    documentation and/or other materials provided with the distribution.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
39 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 *
48 * $FreeBSD$
49 */
50
51
52static void
53fill_bsd64_pagetable (grub_uint8_t *src, grub_addr_t target)
54{
55  grub_uint64_t *pt2, *pt3, *pt4;
56  grub_addr_t pt2t, pt3t;
57  int i;
58
59#define PG_V            0x001
60#define PG_RW           0x002
61#define PG_U            0x004
62#define PG_PS           0x080
63
64  pt4 = (grub_uint64_t *) src;
65  pt3 = (grub_uint64_t *) (src + 4096);
66  pt2 = (grub_uint64_t *) (src + 8192);
67
68  pt3t = target + 4096;
69  pt2t = target + 8192;
70
71  grub_memset (src, 0, 4096 * 3);
72
73  /*
74   * This is kinda brutal, but every single 1GB VM memory segment points to
75   * the same first 1GB of physical memory.  But it is how BSD expects
76   * it to be.
77   */
78  for (i = 0; i < 512; i++)
79    {
80      /* Each slot of the level 4 pages points to the same level 3 page */
81      pt4[i] = (grub_addr_t) pt3t;
82      pt4[i] |= PG_V | PG_RW | PG_U;
83
84      /* Each slot of the level 3 pages points to the same level 2 page */
85      pt3[i] = (grub_addr_t) pt2t;
86      pt3[i] |= PG_V | PG_RW | PG_U;
87
88      /* The level 2 page slots are mapped with 2MB pages for 1GB. */
89      pt2[i] = i * (2 * 1024 * 1024);
90      pt2[i] |= PG_V | PG_RW | PG_PS | PG_U;
91    }
92}
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