diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingAlias.c')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingAlias.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingAlias.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingAlias.c new file mode 100644 index 00000000..a529e50c --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingAlias.c @@ -0,0 +1,193 @@ +/* $Id: bs3-cmn-PagingAlias.c $ */ +/** @file + * BS3Kit - Bs3PagingAlias, Bs3PagingUnalias + */ + +/* + * 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 Bs3PagingAlias +BS3_CMN_DEF(int, Bs3PagingAlias,(uint64_t uDst, uint64_t uPhysToAlias, uint32_t cbHowMuch, uint64_t fPte)) +{ +#if ARCH_BITS == 16 + if (!BS3_MODE_IS_V86(g_bBs3CurrentMode)) +#endif + { + RTCCUINTXREG cr3 = ASMGetCR3(); + uint32_t cPages; + int rc; + + /* + * Validate and adjust the input a little. + */ + if (uDst & X86_PAGE_OFFSET_MASK) + { + cbHowMuch += X86_PAGE_SIZE - (uDst & X86_PAGE_OFFSET_MASK); + uDst &= ~(uint64_t)X86_PAGE_OFFSET_MASK; + } + uPhysToAlias &= X86_PTE_PAE_PG_MASK; + fPte &= ~(X86_PTE_PAE_MBZ_MASK_NX | X86_PTE_PAE_PG_MASK); + cbHowMuch = RT_ALIGN_32(cbHowMuch, X86_PAGE_SIZE); + cPages = cbHowMuch >> X86_PAGE_SHIFT; + //Bs3TestPrintf("Bs3PagingAlias: adjusted: uDst=%RX64 uPhysToAlias=%RX64 cbHowMuch=%RX32 fPte=%Rx64 cPages=%RX32\n", uDst, uPhysToAlias, cbHowMuch, fPte, cPages); + if (BS3_MODE_IS_LEGACY_PAGING(g_bBs3CurrentMode)) + { + X86PTE BS3_FAR *pPteLegacy; + uint32_t uDst32 = (uint32_t)uDst; + uint32_t uPhysToAlias32 = (uint32_t)uPhysToAlias; + if (uDst32 != uDst) + { + Bs3TestPrintf("warning: Bs3PagingAlias - uDst=%RX64 is out of range for legacy paging!\n", uDst); + return VERR_INVALID_PARAMETER; + } + if (uPhysToAlias32 != uPhysToAlias) + { + Bs3TestPrintf("warning: Bs3PagingAlias - uPhysToAlias=%RX64 is out of range for legacy paging!\n", uPhysToAlias); + return VERR_INVALID_PARAMETER; + } + + /* + * Trigger page table splitting first. + */ + while (cPages > 0) + { + pPteLegacy = bs3PagingGetLegacyPte(cr3, uDst32, false, &rc); + if (pPteLegacy) + { + uint32_t cLeftInPt = X86_PG_ENTRIES - ((uDst32 >> X86_PT_SHIFT) & X86_PT_MASK); + if (cPages <= cLeftInPt) + break; + uDst32 += cLeftInPt << X86_PAGE_SHIFT; + cPages -= cLeftInPt; + } + else + { + Bs3TestPrintf("warning: Bs3PagingAlias - bs3PagingGetLegacyPte failed: rc=%d\n", rc); + return rc; + } + } + + /* + * Make the changes. + */ + cPages = cbHowMuch >> X86_PAGE_SHIFT; + uDst32 = (uint32_t)uDst; + while (cPages > 0) + { + uint32_t cLeftInPt = X86_PG_ENTRIES - ((uDst32 >> X86_PT_SHIFT) & X86_PT_MASK); + pPteLegacy = bs3PagingGetLegacyPte(cr3, uDst32, false, &rc); + while (cLeftInPt > 0 && cPages > 0) + { + pPteLegacy->u = uPhysToAlias32 | (uint32_t)fPte; + pPteLegacy++; + uDst32 += X86_PAGE_SIZE; + uPhysToAlias32 += X86_PAGE_SIZE; + cPages--; + cLeftInPt--; + } + } + } + else + { + X86PTEPAE BS3_FAR *pPtePae; + uint64_t const uDstSaved = uDst; + + /* + * Trigger page table splitting first. + */ + while (cPages > 0) + { + pPtePae = bs3PagingGetPaePte(cr3, g_bBs3CurrentMode, uDst, false, &rc); + if (pPtePae) + { + uint32_t cLeftInPt = X86_PG_PAE_ENTRIES - ((uDst >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK); + if (cPages <= cLeftInPt) + break; + cPages -= cLeftInPt; + uDst += cLeftInPt << X86_PAGE_SHIFT; + } + else + { + Bs3TestPrintf("warning: Bs3PagingAlias - bs3PagingGetLegacyPte failed: rc=%d\n", rc); + return rc; + } + } + + /* + * Make the changes. + */ + cPages = cbHowMuch >> X86_PAGE_SHIFT; + uDst = uDstSaved; + while (cPages > 0) + { + uint32_t cLeftInPt = X86_PG_PAE_ENTRIES - ((uDst >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK); + pPtePae = bs3PagingGetPaePte(cr3, g_bBs3CurrentMode, uDst, false, &rc); + while (cLeftInPt > 0 && cPages > 0) + { + pPtePae->u = uPhysToAlias | fPte; + pPtePae++; + uDst += X86_PAGE_SIZE; + uPhysToAlias += X86_PAGE_SIZE; + cPages--; + cLeftInPt--; + } + } + } + + ASMReloadCR3(); + } +#if ARCH_BITS == 16 + /* + * We can't do this stuff in v8086 mode, so switch to 16-bit prot mode and do it there. + */ + else + return Bs3SwitchFromV86To16BitAndCallC((FPFNBS3FAR)Bs3PagingAlias_f16, sizeof(uint64_t)*3 + sizeof(uint32_t), + uDst, uPhysToAlias, cbHowMuch, fPte); +#endif + return VINF_SUCCESS; +} + + +#undef Bs3PagingUnalias +BS3_CMN_DEF(int, Bs3PagingUnalias,(uint64_t uDst, uint32_t cbHowMuch)) +{ + return BS3_CMN_NM(Bs3PagingAlias)(uDst, uDst, cbHowMuch, X86_PTE_P | X86_PTE_RW | X86_PTE_US | X86_PTE_A | X86_PTE_D); +} + |