| 1 | /* $Id: bs3-cmn-PagingSetupCanonicalTraps.c 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3PagingSetupCanonicalTraps
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2020 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 | #include "iprt/asm-amd64-x86.h"
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| 34 |
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| 35 |
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| 36 | #undef Bs3PagingSetupCanonicalTraps
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| 37 | BS3_CMN_PROTO_STUB(void BS3_FAR *, Bs3PagingSetupCanonicalTraps,(void))
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| 38 | {
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| 39 | if (g_uBs3CpuDetected & BS3CPU_F_LONG_MODE)
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| 40 | {
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| 41 | #if ARCH_BITS == 16
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| 42 | if (!BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode))
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| 43 | #endif
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| 44 | {
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| 45 | uint8_t BS3_FAR *pb;
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| 46 | X86PTEPAE BS3_FAR *paLoPtes;
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| 47 | X86PTEPAE BS3_FAR *paHiPtes;
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| 48 | int rc;
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| 49 |
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| 50 | /* Already initialized? Likely. */
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| 51 | if (g_cbBs3PagingCanonicalTraps != 0)
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| 52 | return Bs3XptrFlatToCurrent(g_uBs3PagingCanonicalTrapsAddr);
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| 53 |
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| 54 | /* Initialize AMD64 page tables if necessary (unlikely). */
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| 55 | if (g_PhysPagingRootLM == UINT32_MAX)
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| 56 | {
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| 57 | rc = Bs3PagingInitRootForLM();
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| 58 | if (RT_FAILURE(rc))
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| 59 | return NULL;
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| 60 | }
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| 61 |
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| 62 | /*
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| 63 | * Get the page table entries first to avoid having to unmap things.
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| 64 | */
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| 65 | paLoPtes = bs3PagingGetPaePte(g_PhysPagingRootLM, BS3_MODE_LM64, UINT64_C(0x00007fffffffe000), false, &rc);
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| 66 | paHiPtes = bs3PagingGetPaePte(g_PhysPagingRootLM, BS3_MODE_LM64, UINT64_C(0xffff800000000000), false, &rc);
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| 67 | if (!paHiPtes || !paLoPtes)
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| 68 | {
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| 69 | Bs3TestPrintf("warning: Bs3PagingSetupCanonicalTraps - failed to get PTEs!\n");
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| 70 | return NULL;
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| 71 | }
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| 72 |
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| 73 | /*
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| 74 | * Allocate the buffer. Currently using 8KB on each side.
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| 75 | */
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| 76 | pb = (uint8_t BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, X86_PAGE_SIZE * 4);
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| 77 | if (pb)
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| 78 | {
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| 79 | RTCCUINTXREG uFlat = Bs3SelPtrToFlat(pb);
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| 80 |
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| 81 | /*
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| 82 | * Inject it into the page tables.
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| 83 | */
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| 84 | paLoPtes[0].u &= ~X86_PTE_PAE_PG_MASK;
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| 85 | paLoPtes[0].u |= uFlat + X86_PAGE_SIZE * 0;
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| 86 | paLoPtes[1].u &= ~X86_PTE_PAE_PG_MASK;
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| 87 | paLoPtes[1].u |= uFlat + X86_PAGE_SIZE * 1;
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| 88 |
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| 89 | paHiPtes[0].u &= ~X86_PTE_PAE_PG_MASK;
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| 90 | paHiPtes[0].u |= uFlat + X86_PAGE_SIZE * 2;
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| 91 | paHiPtes[1].u &= ~X86_PTE_PAE_PG_MASK;
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| 92 | paHiPtes[1].u |= uFlat + X86_PAGE_SIZE * 3;
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| 93 | ASMReloadCR3();
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| 94 |
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| 95 | /*
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| 96 | * Update globals and return successfully.
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| 97 | */
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| 98 | g_uBs3PagingCanonicalTrapsAddr = uFlat;
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| 99 | g_cbBs3PagingCanonicalTraps = X86_PAGE_SIZE * 4;
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| 100 | g_cbBs3PagingOneCanonicalTrap = X86_PAGE_SIZE * 2;
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| 101 | return pb;
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| 102 | }
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| 103 |
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| 104 | Bs3TestPrintf("warning: Bs3PagingSetupCanonicalTraps - out of memory (mode %#x)\n", g_bBs3CurrentMode);
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| 105 | }
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| 106 | #if ARCH_BITS == 16
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| 107 | else
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| 108 | Bs3TestPrintf("warning: Bs3PagingSetupCanonicalTraps was called in RM or V86 mode (%#x)!\n", g_bBs3CurrentMode);
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| 109 | #endif
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| 110 | }
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| 111 | return NULL;
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| 112 | }
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| 113 |
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