52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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/*
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* plex86: run multiple x86 operating systems concurrently
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* Copyright (C) 1999-2003 Kevin P. Lawton
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*
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* paging.h: defines for x86 paging structures
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __PAGING_H__
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#define __PAGING_H__
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#define PG_D 0x00000040
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#define PG_A 0x00000020
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/* Page Directory/Table format */
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typedef union {
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Bit32u raw;
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struct {
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Bit32u P:1;
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Bit32u RW:1;
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Bit32u US:1;
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Bit32u PWT:1;
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Bit32u PCD:1;
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Bit32u A:1;
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Bit32u D:1;
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Bit32u PS:1;
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Bit32u G:1;
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Bit32u avail:3;
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Bit32u base:20;
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} __attribute__ ((packed)) fields;
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} __attribute__ ((packed)) pageEntry_t;
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typedef union {
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Bit8u bytes[4096];
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pageEntry_t pte[1024];
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} page_t;
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#endif /* __PAGING_H__ */
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