| 1 | /* $Id: bs3-cmn-PagingInitRootForPP.c 59239 2016-01-01 01:49:33Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3PagingInitRootForPP
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2015 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.alldomusa.eu.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 | /*********************************************************************************************************************************
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| 28 | * Header Files *
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| 29 | *********************************************************************************************************************************/
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| 30 | #include "bs3kit-template-header.h"
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| 31 | #include "bs3-cmn-paging.h"
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| 32 | #include <iprt/asm.h>
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| 33 |
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| 34 |
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| 35 | BS3_DECL(int) Bs3PagingInitRootForPP(void)
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| 36 | {
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| 37 | X86PD BS3_FAR *pPgDir;
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| 38 |
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| 39 | BS3_ASSERT(BS3_DATA_NM(g_PhysPagingRootPP) == UINT32_MAX);
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| 40 |
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| 41 |
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| 42 | /*
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| 43 | * By default we do a identity mapping of the entire address space
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| 44 | * using 4 GB pages. So, we only really need one page directory,
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| 45 | * that's all.
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| 46 | *
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| 47 | * ASSUMES page size extension available, i.e. pentium+.
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| 48 | */
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| 49 | pPgDir = (X86PD BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, _4K);
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| 50 | if (pPgDir)
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| 51 | {
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| 52 | BS3_XPTR_AUTO(X86PD, XptrPgDir);
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| 53 | unsigned i;
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| 54 |
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| 55 | for (i = 0; i < RT_ELEMENTS(pPgDir->a); i++)
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| 56 | {
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| 57 | pPgDir->a[i].u = (uint32_t)i << X86_PD_SHIFT;
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| 58 | pPgDir->a[i].u |= X86_PDE4M_P | X86_PDE4M_RW | X86_PDE4M_US | X86_PDE4M_PS | X86_PDE4M_A | X86_PDE4M_D;
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| 59 | }
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| 60 |
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| 61 | BS3_XPTR_SET(X86PD, XptrPgDir, pPgDir);
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| 62 | BS3_DATA_NM(g_PhysPagingRootPP) = BS3_XPTR_GET_FLAT(X86PD, XptrPgDir);
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| 63 | return VINF_SUCCESS;
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| 64 | }
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| 65 | return VERR_NO_MEMORY;
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| 66 | }
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| 67 |
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