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/* $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;
}
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