diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPAE.c')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPAE.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPAE.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPAE.c new file mode 100644 index 00000000..4e376109 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPAE.c @@ -0,0 +1,102 @@ +/* $Id: bs3-cmn-PagingInitRootForPAE.c $ */ +/** @file + * BS3Kit - Bs3PagingInitRootForPAE + */ + +/* + * 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" + + +#undef Bs3PagingInitRootForPAE +BS3_CMN_DEF(int, Bs3PagingInitRootForPAE,(void)) +{ + X86PDPT BS3_FAR *pPdPtr; + + BS3_ASSERT(g_PhysPagingRootPAE == UINT32_MAX); + + /* + * By default we do a identity mapping of the entire address space + * using 2 GB pages. So, we need four page directories and one page + * directory pointer table with 4 entries. (We cannot share the PDPT with + * long mode because of reserved bit which will cause fatal trouble.) + * + * We assume that the availability of PAE means that PSE is available too. + */ +/** @todo testcase: loading invalid PDPTREs will tripple fault the CPU, won't it? We guru with invalid guest state. */ + pPdPtr = (X86PDPT BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, sizeof(X86PDPE) * 4U); + if (pPdPtr) + { + X86PDPAE BS3_FAR *paPgDirs; + BS3_ASSERT(((uintptr_t)pPdPtr & 0x3f) == 0); + + paPgDirs = (X86PDPAE BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, _4K * 4U); + if (paPgDirs) + { + unsigned i; + BS3_XPTR_AUTO(X86PDPT, XPtrPdPtr); + BS3_XPTR_AUTO(X86PDPAE, XPtrPgDirs); + + /* Set up the 2048 2MB pages first. */ + for (i = 0; i < RT_ELEMENTS(paPgDirs->a) * 4U; i++) + paPgDirs->a[i].u = ((uint32_t)i << X86_PD_PAE_SHIFT) + | X86_PDE4M_P | X86_PDE4M_RW | X86_PDE4M_US | X86_PDE4M_PS | X86_PDE4M_A | X86_PDE4M_D; + + /* Set up the four page directory pointer table entries. */ + BS3_XPTR_SET(X86PDPAE, XPtrPgDirs, paPgDirs); + pPdPtr->a[0].u = BS3_XPTR_GET_FLAT(X86PDPAE, XPtrPgDirs) | X86_PDPE_P; + pPdPtr->a[1].u = pPdPtr->a[0].u + _4K; + pPdPtr->a[2].u = pPdPtr->a[1].u + _4K; + pPdPtr->a[3].u = pPdPtr->a[2].u + _4K; + + /* Free up 8 consequtive entries for raw-mode hypervisor code. */ + if (1) /** @todo detect raw-mode and only do this then. */ + for (i = 0; i < 8; i++) + paPgDirs->a[i + (UINT32_C(0xc0000000) >> X86_PD_PAE_SHIFT)].b.u1Present = 0; + + /* Set the global root pointer and we're done. */ + BS3_XPTR_SET(X86PDPT, XPtrPdPtr, pPdPtr); + g_PhysPagingRootPAE = BS3_XPTR_GET_FLAT(X86PDPT, XPtrPdPtr); + return VINF_SUCCESS; + } + BS3_ASSERT(false); + Bs3MemFree(pPdPtr, _4K); + } + BS3_ASSERT(false); + return VERR_NO_MEMORY; +} + |