| 1 | /* $Id: bs3-cmn-PagingMapRamAbove4GForLM.c 92263 2021-11-08 11:16:15Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3PagingInitMapAbove4GForLM
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2021 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.virtualbox.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 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "bs3kit-template-header.h"
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| 32 | #include "bs3-cmn-paging.h"
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| 33 |
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| 34 | #if ARCH_BITS == 16
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| 35 | # error "This does not work in 16-bit mode, only 32-bit and 64-bit"
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| 36 | #endif
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| 37 |
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| 38 | #undef Bs3PagingMapRamAbove4GForLM
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| 39 | BS3_CMN_DEF(int, Bs3PagingMapRamAbove4GForLM,(uint64_t *puFailurePoint))
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| 40 | {
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| 41 | X86PML4 * const pPml4 = (X86PML4 *)((uintptr_t)g_PhysPagingRootLM);
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| 42 | unsigned iPml4 = 0;
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| 43 | unsigned iPdpt = 4;
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| 44 | uint64_t uAddr = _4G;
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| 45 | X86PDPT * pPdpt;
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| 46 |
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| 47 | if (puFailurePoint)
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| 48 | *puFailurePoint = 0;
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| 49 |
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| 50 | /* Must call Bs3PagingInitRootForLM first! */
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| 51 | if (g_PhysPagingRootLM == UINT32_MAX)
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| 52 | return VERR_WRONG_ORDER;
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| 53 |
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| 54 | /* Done already? */
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| 55 | if (pPml4->a[0].u != pPml4->a[4].u)
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| 56 | return VINF_ALREADY_INITIALIZED;
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| 57 |
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| 58 | /*
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| 59 | * Map RAM pages up to g_uBs3EndOfRamAbove4G.
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| 60 | */
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| 61 | pPdpt = (X86PDPT *)(pPml4->a[0].u & X86_PML4E_PG_MASK);
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| 62 | while (uAddr < g_uBs3EndOfRamAbove4G)
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| 63 | {
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| 64 | X86PDPAE *pPd;
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| 65 | unsigned i;
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| 66 |
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| 67 | /* Do we need a new PDPT? */
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| 68 | if (iPdpt >= RT_ELEMENTS(pPdpt->a))
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| 69 | {
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| 70 | if (iPml4 >= RT_ELEMENTS(pPml4->a) / 2)
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| 71 | {
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| 72 | if (puFailurePoint)
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| 73 | *puFailurePoint = uAddr;
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| 74 | return VERR_OUT_OF_RANGE;
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| 75 | }
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| 76 | pPdpt = (X86PDPT *)Bs3MemAllocZ(BS3MEMKIND_FLAT32, X86_PAGE_SIZE);
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| 77 | if (!pPdpt || ((uintptr_t)pPdpt & X86_PAGE_OFFSET_MASK))
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| 78 | {
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| 79 | if (puFailurePoint)
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| 80 | *puFailurePoint = uAddr;
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| 81 | return !pPdpt ? VERR_NO_MEMORY : VERR_UNSUPPORTED_ALIGNMENT;
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| 82 | }
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| 83 | pPml4->a[++iPml4].u = X86_PML4E_P | X86_PML4E_RW | X86_PML4E_US | X86_PML4E_A
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| 84 | | (uintptr_t)pPdpt;
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| 85 | iPdpt = 0;
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| 86 | }
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| 87 |
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| 88 | /* Allocate a new page directory. */
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| 89 | pPd = (X86PDPAE *)Bs3MemAlloc(BS3MEMKIND_FLAT32, X86_PAGE_SIZE);
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| 90 | if (!pPd || ((uintptr_t)pPd & X86_PAGE_OFFSET_MASK))
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| 91 | {
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| 92 | if (puFailurePoint)
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| 93 | *puFailurePoint = uAddr;
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| 94 | return !pPd ? VERR_NO_MEMORY : VERR_UNSUPPORTED_ALIGNMENT;
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| 95 | }
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| 96 |
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| 97 | /* Initialize it. */
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| 98 | for (i = 0; i < RT_ELEMENTS(pPd->a); i++)
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| 99 | {
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| 100 | pPd->a[i].u = uAddr | X86_PDE4M_P | X86_PDE4M_RW | X86_PDE4M_US | X86_PDE4M_PS | X86_PDE4M_A | X86_PDE4M_D;
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| 101 | uAddr += _2M;
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| 102 | }
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| 103 |
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| 104 | /* Insert it into the page directory pointer table. */
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| 105 | pPdpt->a[iPdpt++].u = (uintptr_t)pPd | X86_PDPE_P | X86_PDPE_RW | X86_PDPE_US | X86_PDPE_A;
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| 106 | }
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| 107 |
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| 108 | return VINF_SUCCESS;
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| 109 | }
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| 110 |
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