| 1 | /* $Id: bs3-cmn-PagingInitRootForPAE.c 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3PagingInitRootForPAE
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include "bs3kit-template-header.h"
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| 42 | #include "bs3-cmn-paging.h"
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| 43 |
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| 44 |
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| 45 | #undef Bs3PagingInitRootForPAE
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| 46 | BS3_CMN_DEF(int, Bs3PagingInitRootForPAE,(void))
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| 47 | {
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| 48 | X86PDPT BS3_FAR *pPdPtr;
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| 49 |
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| 50 | BS3_ASSERT(g_PhysPagingRootPAE == UINT32_MAX);
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| 51 |
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| 52 | /*
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| 53 | * By default we do a identity mapping of the entire address space
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| 54 | * using 2 GB pages. So, we need four page directories and one page
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| 55 | * directory pointer table with 4 entries. (We cannot share the PDPT with
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| 56 | * long mode because of reserved bit which will cause fatal trouble.)
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| 57 | *
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| 58 | * We assume that the availability of PAE means that PSE is available too.
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| 59 | */
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| 60 | /** @todo testcase: loading invalid PDPTREs will tripple fault the CPU, won't it? We guru with invalid guest state. */
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| 61 | pPdPtr = (X86PDPT BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, sizeof(X86PDPE) * 4U);
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| 62 | if (pPdPtr)
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| 63 | {
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| 64 | X86PDPAE BS3_FAR *paPgDirs;
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| 65 | BS3_ASSERT(((uintptr_t)pPdPtr & 0x3f) == 0);
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| 66 |
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| 67 | paPgDirs = (X86PDPAE BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, _4K * 4U);
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| 68 | if (paPgDirs)
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| 69 | {
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| 70 | unsigned i;
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| 71 | BS3_XPTR_AUTO(X86PDPT, XPtrPdPtr);
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| 72 | BS3_XPTR_AUTO(X86PDPAE, XPtrPgDirs);
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| 73 |
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| 74 | /* Set up the 2048 2MB pages first. */
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| 75 | for (i = 0; i < RT_ELEMENTS(paPgDirs->a) * 4U; i++)
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| 76 | paPgDirs->a[i].u = ((uint32_t)i << X86_PD_PAE_SHIFT)
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| 77 | | X86_PDE4M_P | X86_PDE4M_RW | X86_PDE4M_US | X86_PDE4M_PS | X86_PDE4M_A | X86_PDE4M_D;
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| 78 |
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| 79 | /* Set up the four page directory pointer table entries. */
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| 80 | BS3_XPTR_SET(X86PDPAE, XPtrPgDirs, paPgDirs);
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| 81 | pPdPtr->a[0].u = BS3_XPTR_GET_FLAT(X86PDPAE, XPtrPgDirs) | X86_PDPE_P;
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| 82 | pPdPtr->a[1].u = pPdPtr->a[0].u + _4K;
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| 83 | pPdPtr->a[2].u = pPdPtr->a[1].u + _4K;
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| 84 | pPdPtr->a[3].u = pPdPtr->a[2].u + _4K;
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| 85 |
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| 86 | /* Free up 8 consequtive entries for raw-mode hypervisor code. */
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| 87 | if (1) /** @todo detect raw-mode and only do this then. */
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| 88 | for (i = 0; i < 8; i++)
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| 89 | paPgDirs->a[i + (UINT32_C(0xc0000000) >> X86_PD_PAE_SHIFT)].b.u1Present = 0;
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| 90 |
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| 91 | /* Set the global root pointer and we're done. */
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| 92 | BS3_XPTR_SET(X86PDPT, XPtrPdPtr, pPdPtr);
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| 93 | g_PhysPagingRootPAE = BS3_XPTR_GET_FLAT(X86PDPT, XPtrPdPtr);
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| 94 | return VINF_SUCCESS;
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| 95 | }
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| 96 | BS3_ASSERT(false);
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| 97 | Bs3MemFree(pPdPtr, _4K);
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| 98 | }
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| 99 | BS3_ASSERT(false);
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| 100 | return VERR_NO_MEMORY;
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| 101 | }
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| 102 |
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