diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingSetupCanonicalTraps.c')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingSetupCanonicalTraps.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingSetupCanonicalTraps.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingSetupCanonicalTraps.c new file mode 100644 index 00000000..3343819f --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingSetupCanonicalTraps.c @@ -0,0 +1,123 @@ +/* $Id: bs3-cmn-PagingSetupCanonicalTraps.c $ */ +/** @file + * BS3Kit - Bs3PagingSetupCanonicalTraps + */ + +/* + * Copyright (C) 2007-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include "bs3kit-template-header.h" +#include "bs3-cmn-paging.h" +#include "iprt/asm-amd64-x86.h" + + +#undef Bs3PagingSetupCanonicalTraps +BS3_CMN_PROTO_STUB(void BS3_FAR *, Bs3PagingSetupCanonicalTraps,(void)) +{ + if (g_uBs3CpuDetected & BS3CPU_F_LONG_MODE) + { +#if ARCH_BITS == 16 + if (!BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode)) +#endif + { + uint8_t BS3_FAR *pb; + X86PTEPAE BS3_FAR *paLoPtes; + X86PTEPAE BS3_FAR *paHiPtes; + int rc; + + /* Already initialized? Likely. */ + if (g_cbBs3PagingCanonicalTraps != 0) + return Bs3XptrFlatToCurrent(g_uBs3PagingCanonicalTrapsAddr); + + /* Initialize AMD64 page tables if necessary (unlikely). */ + if (g_PhysPagingRootLM == UINT32_MAX) + { + rc = Bs3PagingInitRootForLM(); + if (RT_FAILURE(rc)) + return NULL; + } + + /* + * Get the page table entries first to avoid having to unmap things. + */ + paLoPtes = bs3PagingGetPaePte(g_PhysPagingRootLM, BS3_MODE_LM64, UINT64_C(0x00007fffffffe000), false, &rc); + paHiPtes = bs3PagingGetPaePte(g_PhysPagingRootLM, BS3_MODE_LM64, UINT64_C(0xffff800000000000), false, &rc); + if (!paHiPtes || !paLoPtes) + { + Bs3TestPrintf("warning: Bs3PagingSetupCanonicalTraps - failed to get PTEs!\n"); + return NULL; + } + + /* + * Allocate the buffer. Currently using 8KB on each side. + */ + pb = (uint8_t BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, X86_PAGE_SIZE * 4); + if (pb) + { + RTCCUINTXREG uFlat = Bs3SelPtrToFlat(pb); + + /* + * Inject it into the page tables. + */ + paLoPtes[0].u &= ~X86_PTE_PAE_PG_MASK; + paLoPtes[0].u |= uFlat + X86_PAGE_SIZE * 0; + paLoPtes[1].u &= ~X86_PTE_PAE_PG_MASK; + paLoPtes[1].u |= uFlat + X86_PAGE_SIZE * 1; + + paHiPtes[0].u &= ~X86_PTE_PAE_PG_MASK; + paHiPtes[0].u |= uFlat + X86_PAGE_SIZE * 2; + paHiPtes[1].u &= ~X86_PTE_PAE_PG_MASK; + paHiPtes[1].u |= uFlat + X86_PAGE_SIZE * 3; + ASMReloadCR3(); + + /* + * Update globals and return successfully. + */ + g_uBs3PagingCanonicalTrapsAddr = uFlat; + g_cbBs3PagingCanonicalTraps = X86_PAGE_SIZE * 4; + g_cbBs3PagingOneCanonicalTrap = X86_PAGE_SIZE * 2; + return pb; + } + + Bs3TestPrintf("warning: Bs3PagingSetupCanonicalTraps - out of memory (mode %#x)\n", g_bBs3CurrentMode); + } +#if ARCH_BITS == 16 + else + Bs3TestPrintf("warning: Bs3PagingSetupCanonicalTraps was called in RM or V86 mode (%#x)!\n", g_bBs3CurrentMode); +#endif + } + return NULL; +} + |