| 1 | /* $Id: bs3-cmn-PagingInitRootForPP.c 106061 2024-09-16 14:03:52Z 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) 2007-2024 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 | #include "bs3-cmn-memory.h" /* bad bird */
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| 44 | #include <iprt/param.h>
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| 45 |
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| 46 |
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| 47 | /**
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| 48 | * Creates page tables for a section of the page directory.
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| 49 | *
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| 50 | * @returns VINF_SUCCESS or VERR_NO_MEMORY.
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| 51 | * @param pPgDir The page directory.
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| 52 | * @param iFirst The first PD entry.
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| 53 | * @param cEntries How many PD entries to create pages tables for.
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| 54 | */
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| 55 | static int Bs3PagingInitPageTablesForPgDir(X86PD BS3_FAR *pPgDir, unsigned iFirst, unsigned cEntries)
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| 56 | {
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| 57 | uint32_t uCurPhys = (uint32_t)iFirst << X86_PD_SHIFT;
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| 58 |
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| 59 | while (cEntries--)
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| 60 | {
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| 61 | X86PT BS3_FAR *pPt = (X86PT BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, _4K);
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| 62 | if (pPt)
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| 63 | {
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| 64 | unsigned j = 0;
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| 65 | for (j = 0; j < RT_ELEMENTS(pPt->a); j++, uCurPhys += PAGE_SIZE)
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| 66 | {
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| 67 | pPt->a[j].u = uCurPhys;
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| 68 | pPt->a[j].u |= X86_PTE_P | X86_PTE_RW | X86_PTE_US | X86_PTE_A | X86_PTE_D;
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| 69 | }
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| 70 | pPgDir->a[iFirst].u = Bs3SelPtrToFlat(pPt);
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| 71 | pPgDir->a[iFirst].u |= X86_PDE_P | X86_PDE_RW | X86_PDE_US | X86_PDE_A;
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| 72 | iFirst++;
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| 73 | }
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| 74 | else
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| 75 | return VERR_NO_MEMORY;
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| 76 | }
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| 77 | return VINF_SUCCESS;
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| 78 | }
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| 79 |
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| 80 |
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| 81 | #undef Bs3PagingInitRootForPP
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| 82 | BS3_CMN_DEF(int, Bs3PagingInitRootForPP,(void))
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| 83 | {
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| 84 | X86PD BS3_FAR *pPgDir;
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| 85 |
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| 86 | BS3_ASSERT(g_PhysPagingRootPP == UINT32_MAX);
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| 87 |
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| 88 |
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| 89 | /*
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| 90 | * By default we do a identity mapping of the entire address space
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| 91 | * using 4 GB pages. So, we only really need one page directory,
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| 92 | * that's all.
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| 93 | *
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| 94 | * ASSUMES page size extension available, i.e. pentium+.
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| 95 | */
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| 96 | pPgDir = (X86PD BS3_FAR *)Bs3MemAllocZ(BS3MEMKIND_TILED, _4K);
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| 97 | if (pPgDir)
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| 98 | {
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| 99 | BS3_XPTR_AUTO(X86PD, XptrPgDir);
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| 100 | unsigned i;
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| 101 | int rc = VINF_SUCCESS;
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| 102 |
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| 103 | if (g_uBs3CpuDetected & BS3CPU_F_PSE)
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| 104 | {
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| 105 | for (i = 0; i < RT_ELEMENTS(pPgDir->a); i++)
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| 106 | {
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| 107 | pPgDir->a[i].u = (uint32_t)i << X86_PD_SHIFT;
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| 108 | 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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| 109 | }
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| 110 |
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| 111 | /* Free up 4 consequtive entries for raw-mode hypervisor code. */
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| 112 | if (1) /** @todo detect raw-mode and only do this then. */
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| 113 | for (i = 0; i < 4; i++)
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| 114 | pPgDir->a[i + (UINT32_C(0xc0000000) >> X86_PD_SHIFT)].b.u1Present = 0;
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| 115 | }
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| 116 | else
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| 117 | {
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| 118 | /*
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| 119 | * This requires 4MB of page tables if we map everything.
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| 120 | * So, we check how much memory we have available and make sure we
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| 121 | * don't use all of it for page tables.
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| 122 | */
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| 123 | unsigned cMax = RT_ELEMENTS(pPgDir->a);
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| 124 | uint32_t cFreePages = g_Bs3Mem4KUpperTiled.Core.cFreeChunks + g_Bs3Mem4KLow.Core.cFreeChunks;
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| 125 | if (cFreePages >= cMax + 128)
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| 126 | Bs3PagingInitPageTablesForPgDir(pPgDir, 0, cMax);
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| 127 | else
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| 128 | {
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| 129 | unsigned cTop;
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| 130 | if (cMax >= 256 /*1MB*/)
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| 131 | {
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| 132 | cMax = cFreePages - 128;
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| 133 | cTop = 32;
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| 134 | }
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| 135 | else if (cMax >= 128)
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| 136 | {
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| 137 | cMax = cFreePages - 48;
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| 138 | cTop = 16;
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| 139 | }
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| 140 | else
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| 141 | {
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| 142 | cMax = cFreePages - 16;
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| 143 | cTop = RT_MIN(16, cMax / 4);
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| 144 | }
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| 145 | Bs3TestPrintf("Bs3PagingInitRootForPP: Warning! insufficient memory for mapping all 4GB!\n"
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| 146 | " Will only map 0x00000000-%#010RX32 and %#010RX32-0xffffffff.\n",
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| 147 | (uint32_t)(cMax - cTop) << PAGE_SHIFT, UINT32_MAX - ((uint32_t)cTop << PAGE_SHIFT) + 1);
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| 148 | rc = Bs3PagingInitPageTablesForPgDir(pPgDir, 0, cMax - cTop);
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| 149 | if (RT_SUCCESS(rc))
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| 150 | rc = Bs3PagingInitPageTablesForPgDir(pPgDir, RT_ELEMENTS(pPgDir->a) - cTop, cTop);
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| 151 | }
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| 152 | }
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| 153 |
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| 154 | BS3_XPTR_SET(X86PD, XptrPgDir, pPgDir);
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| 155 | g_PhysPagingRootPP = BS3_XPTR_GET_FLAT(X86PD, XptrPgDir);
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| 156 | return rc;
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| 157 | }
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| 158 |
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| 159 | Bs3Printf("Bs3PagingInitRootForPP: No memory!\n");
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| 160 | BS3_ASSERT(false);
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| 161 | return VERR_NO_MEMORY;
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| 162 | }
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| 163 |
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