89 lines
3.2 KiB
C
89 lines
3.2 KiB
C
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Based on the code from FreeBSD originally distributed under the
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following terms: */
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/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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static void
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fill_bsd64_pagetable (grub_uint8_t *target)
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{
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grub_uint64_t *pt2, *pt3, *pt4;
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int i;
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#define PG_V 0x001
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#define PG_RW 0x002
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#define PG_U 0x004
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#define PG_PS 0x080
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pt4 = (grub_uint64_t *) target;
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pt3 = (grub_uint64_t *) (target + 4096);
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pt2 = (grub_uint64_t *) (target + 8192);
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grub_memset ((char *) target, 0, 4096 * 3);
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/*
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* This is kinda brutal, but every single 1GB VM memory segment points to
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* the same first 1GB of physical memory. But it is how BSD expects
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* it to be.
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*/
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for (i = 0; i < 512; i++)
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{
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/* Each slot of the level 4 pages points to the same level 3 page */
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pt4[i] = (grub_addr_t) &pt3[0];
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pt4[i] |= PG_V | PG_RW | PG_U;
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/* Each slot of the level 3 pages points to the same level 2 page */
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pt3[i] = (grub_addr_t) &pt2[0];
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pt3[i] |= PG_V | PG_RW | PG_U;
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/* The level 2 page slots are mapped with 2MB pages for 1GB. */
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pt2[i] = i * (2 * 1024 * 1024);
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pt2[i] |= PG_V | PG_RW | PG_PS | PG_U;
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}
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}
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