diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingMapRamAbove4GForLM.c')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingMapRamAbove4GForLM.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingMapRamAbove4GForLM.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingMapRamAbove4GForLM.c new file mode 100644 index 00000000..18221067 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingMapRamAbove4GForLM.c @@ -0,0 +1,120 @@ +/* $Id: bs3-cmn-PagingMapRamAbove4GForLM.c $ */ +/** @file + * BS3Kit - Bs3PagingInitMapAbove4GForLM + */ + +/* + * Copyright (C) 2007-2022 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" + +#if ARCH_BITS == 16 +# error "This does not work in 16-bit mode, only 32-bit and 64-bit" +#endif + +#undef Bs3PagingMapRamAbove4GForLM +BS3_CMN_DEF(int, Bs3PagingMapRamAbove4GForLM,(uint64_t *puFailurePoint)) +{ + X86PML4 * const pPml4 = (X86PML4 *)((uintptr_t)g_PhysPagingRootLM); + unsigned iPml4 = 0; + unsigned iPdpt = 4; + uint64_t uAddr = _4G; + X86PDPT * pPdpt; + + if (puFailurePoint) + *puFailurePoint = 0; + + /* Must call Bs3PagingInitRootForLM first! */ + if (g_PhysPagingRootLM == UINT32_MAX) + return VERR_WRONG_ORDER; + + /* Done already? */ + if (pPml4->a[0].u != pPml4->a[4].u) + return VINF_ALREADY_INITIALIZED; + + /* + * Map RAM pages up to g_uBs3EndOfRamAbove4G. + */ + pPdpt = (X86PDPT *)(pPml4->a[0].u & X86_PML4E_PG_MASK); + while (uAddr < g_uBs3EndOfRamAbove4G) + { + X86PDPAE *pPd; + unsigned i; + + /* Do we need a new PDPT? */ + if (iPdpt >= RT_ELEMENTS(pPdpt->a)) + { + if (iPml4 >= RT_ELEMENTS(pPml4->a) / 2) + { + if (puFailurePoint) + *puFailurePoint = uAddr; + return VERR_OUT_OF_RANGE; + } + pPdpt = (X86PDPT *)Bs3MemAllocZ(BS3MEMKIND_FLAT32, X86_PAGE_SIZE); + if (!pPdpt || ((uintptr_t)pPdpt & X86_PAGE_OFFSET_MASK)) + { + if (puFailurePoint) + *puFailurePoint = uAddr; + return !pPdpt ? VERR_NO_MEMORY : VERR_UNSUPPORTED_ALIGNMENT; + } + pPml4->a[++iPml4].u = X86_PML4E_P | X86_PML4E_RW | X86_PML4E_US | X86_PML4E_A + | (uintptr_t)pPdpt; + iPdpt = 0; + } + + /* Allocate a new page directory. */ + pPd = (X86PDPAE *)Bs3MemAlloc(BS3MEMKIND_FLAT32, X86_PAGE_SIZE); + if (!pPd || ((uintptr_t)pPd & X86_PAGE_OFFSET_MASK)) + { + if (puFailurePoint) + *puFailurePoint = uAddr; + return !pPd ? VERR_NO_MEMORY : VERR_UNSUPPORTED_ALIGNMENT; + } + + /* Initialize it. */ + for (i = 0; i < RT_ELEMENTS(pPd->a); i++) + { + pPd->a[i].u = uAddr | X86_PDE4M_P | X86_PDE4M_RW | X86_PDE4M_US | X86_PDE4M_PS | X86_PDE4M_A | X86_PDE4M_D; + uAddr += _2M; + } + + /* Insert it into the page directory pointer table. */ + pPdpt->a[iPdpt++].u = (uintptr_t)pPd | X86_PDPE_P | X86_PDPE_RW | X86_PDPE_US | X86_PDPE_A; + } + + return VINF_SUCCESS; +} + |