| 1 | /* $Id: bs3-cmn-PagingMapRamAbove4GForLM.c 98103 2023-01-17 14:15:46Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * BS3Kit - Bs3PagingInitMapAbove4GForLM
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2007-2023 Oracle and/or its affiliates.
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox base platform packages, as
|
|---|
| 10 | * available from https://www.virtualbox.org.
|
|---|
| 11 | *
|
|---|
| 12 | * This program is free software; you can redistribute it and/or
|
|---|
| 13 | * modify it under the terms of the GNU General Public License
|
|---|
| 14 | * as published by the Free Software Foundation, in version 3 of the
|
|---|
| 15 | * License.
|
|---|
| 16 | *
|
|---|
| 17 | * This program is distributed in the hope that it will be useful, but
|
|---|
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 20 | * General Public License for more details.
|
|---|
| 21 | *
|
|---|
| 22 | * You should have received a copy of the GNU General Public License
|
|---|
| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
|
|---|
| 24 | *
|
|---|
| 25 | * The contents of this file may alternatively be used under the terms
|
|---|
| 26 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
|
|---|
| 28 | * in the VirtualBox distribution, in which case the provisions of the
|
|---|
| 29 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 30 | *
|
|---|
| 31 | * You may elect to license modified versions of this file under the
|
|---|
| 32 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 33 | *
|
|---|
| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
|
|---|
| 35 | */
|
|---|
| 36 |
|
|---|
| 37 |
|
|---|
| 38 | /*********************************************************************************************************************************
|
|---|
| 39 | * Header Files *
|
|---|
| 40 | *********************************************************************************************************************************/
|
|---|
| 41 | #include "bs3kit-template-header.h"
|
|---|
| 42 | #include "bs3-cmn-paging.h"
|
|---|
| 43 |
|
|---|
| 44 | #if ARCH_BITS == 16
|
|---|
| 45 | # error "This does not work in 16-bit mode, only 32-bit and 64-bit"
|
|---|
| 46 | #endif
|
|---|
| 47 |
|
|---|
| 48 | #undef Bs3PagingMapRamAbove4GForLM
|
|---|
| 49 | BS3_CMN_DEF(int, Bs3PagingMapRamAbove4GForLM,(uint64_t *puFailurePoint))
|
|---|
| 50 | {
|
|---|
| 51 | X86PML4 * const pPml4 = (X86PML4 *)((uintptr_t)g_PhysPagingRootLM);
|
|---|
| 52 | unsigned iPml4 = 0;
|
|---|
| 53 | unsigned iPdpt = 4;
|
|---|
| 54 | uint64_t uAddr = _4G;
|
|---|
| 55 | X86PDPT * pPdpt;
|
|---|
| 56 |
|
|---|
| 57 | if (puFailurePoint)
|
|---|
| 58 | *puFailurePoint = 0;
|
|---|
| 59 |
|
|---|
| 60 | /* Must call Bs3PagingInitRootForLM first! */
|
|---|
| 61 | if (g_PhysPagingRootLM == UINT32_MAX)
|
|---|
| 62 | return VERR_WRONG_ORDER;
|
|---|
| 63 |
|
|---|
| 64 | /* Done already? */
|
|---|
| 65 | if (pPml4->a[0].u != pPml4->a[4].u)
|
|---|
| 66 | return VINF_ALREADY_INITIALIZED;
|
|---|
| 67 |
|
|---|
| 68 | /*
|
|---|
| 69 | * Map RAM pages up to g_uBs3EndOfRamAbove4G.
|
|---|
| 70 | */
|
|---|
| 71 | pPdpt = (X86PDPT *)(pPml4->a[0].u & X86_PML4E_PG_MASK);
|
|---|
| 72 | while (uAddr < g_uBs3EndOfRamAbove4G)
|
|---|
| 73 | {
|
|---|
| 74 | X86PDPAE *pPd;
|
|---|
| 75 | unsigned i;
|
|---|
| 76 |
|
|---|
| 77 | /* Do we need a new PDPT? */
|
|---|
| 78 | if (iPdpt >= RT_ELEMENTS(pPdpt->a))
|
|---|
| 79 | {
|
|---|
| 80 | if (iPml4 >= RT_ELEMENTS(pPml4->a) / 2)
|
|---|
| 81 | {
|
|---|
| 82 | if (puFailurePoint)
|
|---|
| 83 | *puFailurePoint = uAddr;
|
|---|
| 84 | return VERR_OUT_OF_RANGE;
|
|---|
| 85 | }
|
|---|
| 86 | pPdpt = (X86PDPT *)Bs3MemAllocZ(BS3MEMKIND_FLAT32, X86_PAGE_SIZE);
|
|---|
| 87 | if (!pPdpt || ((uintptr_t)pPdpt & X86_PAGE_OFFSET_MASK))
|
|---|
| 88 | {
|
|---|
| 89 | if (puFailurePoint)
|
|---|
| 90 | *puFailurePoint = uAddr;
|
|---|
| 91 | return !pPdpt ? VERR_NO_MEMORY : VERR_UNSUPPORTED_ALIGNMENT;
|
|---|
| 92 | }
|
|---|
| 93 | pPml4->a[++iPml4].u = X86_PML4E_P | X86_PML4E_RW | X86_PML4E_US | X86_PML4E_A
|
|---|
| 94 | | (uintptr_t)pPdpt;
|
|---|
| 95 | iPdpt = 0;
|
|---|
| 96 | }
|
|---|
| 97 |
|
|---|
| 98 | /* Allocate a new page directory. */
|
|---|
| 99 | pPd = (X86PDPAE *)Bs3MemAlloc(BS3MEMKIND_FLAT32, X86_PAGE_SIZE);
|
|---|
| 100 | if (!pPd || ((uintptr_t)pPd & X86_PAGE_OFFSET_MASK))
|
|---|
| 101 | {
|
|---|
| 102 | if (puFailurePoint)
|
|---|
| 103 | *puFailurePoint = uAddr;
|
|---|
| 104 | return !pPd ? VERR_NO_MEMORY : VERR_UNSUPPORTED_ALIGNMENT;
|
|---|
| 105 | }
|
|---|
| 106 |
|
|---|
| 107 | /* Initialize it. */
|
|---|
| 108 | for (i = 0; i < RT_ELEMENTS(pPd->a); i++)
|
|---|
| 109 | {
|
|---|
| 110 | pPd->a[i].u = uAddr | X86_PDE4M_P | X86_PDE4M_RW | X86_PDE4M_US | X86_PDE4M_PS | X86_PDE4M_A | X86_PDE4M_D;
|
|---|
| 111 | uAddr += _2M;
|
|---|
| 112 | }
|
|---|
| 113 |
|
|---|
| 114 | /* Insert it into the page directory pointer table. */
|
|---|
| 115 | pPdpt->a[iPdpt++].u = (uintptr_t)pPd | X86_PDPE_P | X86_PDPE_RW | X86_PDPE_US | X86_PDPE_A;
|
|---|
| 116 | }
|
|---|
| 117 |
|
|---|
| 118 | return VINF_SUCCESS;
|
|---|
| 119 | }
|
|---|
| 120 |
|
|---|
