0768d01522
new experimental stripped-down version of plex86, which is now a user-code-only VM. I ripped out all the fancy stuff in plex86, such that under that right conditions, user-code (protection level 3) can run at near native speeds inside the plex86 VM. The general idea is that bochs emulates all the initial real-mode code, and guest kernel code (protection level 0). When it senses the right conditions (like the context switches to user-code), a shim is called to execute the guest inside the plex86 VM. All guest-generated faults/exceptions are then forwarded back to bochs to be handled in the emulator. Actually, I'm not yet adding the mods to the bochs code (other than the shim code which is in a separate file), until I hear that we're back in a more development mode with bochs after the 2.0 release. The plex86 subdirectory is really a separate project. It's just more convenient to co-develop it with bochs for now. Both projects are currently LGPL, but each should be taken to be a separate project, and have their own license file. Plex86 (it's only a kernel driver now) could ultimately be used with other projects, as it's modular. I talked with Bryce, and we both agreed it's OK to keep plex86 as a subdir in bochs for now.
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/*
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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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