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/* $Id: bs3-cmn-PagingInitRootForLM.c $ */
/** @file
* BS3Kit - Bs3PagingInitRootForLM
*/
/*
* 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 Bs3PagingInitRootForLM
BS3_CMN_DEF(int, Bs3PagingInitRootForLM,(void))
{
X86PML4 BS3_FAR *pPml4;
BS3_ASSERT(g_PhysPagingRootLM == UINT32_MAX);
/*
* The default is an identity mapping of the first 4GB repeated for the
* whole 48-bit virtual address space. So, we need one level more than PAE.
*/
pPml4 = (X86PML4 BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, _4K);
if (pPml4)
{
X86PDPT BS3_FAR *pPdPtr = (X86PDPT BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, _4K);
BS3_ASSERT((uintptr_t)pPdPtr != (uintptr_t)pPml4);
if (pPdPtr)
{
X86PDPAE BS3_FAR *paPgDirs = (X86PDPAE BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, _4K * 4U);
BS3_ASSERT((uintptr_t)paPgDirs != (uintptr_t)pPml4);
if (paPgDirs)
{
unsigned i;
BS3_XPTR_AUTO(X86PML4, XPtrPml4);
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 page directory pointer table next (4GB replicated, remember). */
BS3_XPTR_SET(X86PDPAE, XPtrPgDirs, paPgDirs);
pPdPtr->a[0].u = BS3_XPTR_GET_FLAT(X86PDPAE, XPtrPgDirs)
| X86_PDPE_P | X86_PDPE_RW | X86_PDPE_US | X86_PDPE_A;
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;
for (i = 4; i < RT_ELEMENTS(pPdPtr->a); i += 4)
{
pPdPtr->a[i + 0].u = pPdPtr->a[0].u;
pPdPtr->a[i + 1].u = pPdPtr->a[1].u;
pPdPtr->a[i + 2].u = pPdPtr->a[2].u;
pPdPtr->a[i + 3].u = pPdPtr->a[3].u;
}
/* Set up the page map level 4 (all entries are the same). */
BS3_XPTR_SET(X86PDPT, XPtrPdPtr, pPdPtr);
pPml4->a[0].u = BS3_XPTR_GET_FLAT(X86PDPT, XPtrPdPtr)
| X86_PML4E_P | X86_PML4E_RW | X86_PML4E_US | X86_PML4E_A;
for (i = 1; i < RT_ELEMENTS(pPml4->a); i++)
pPml4->a[i].u = pPml4->a[0].u;
/* Set the global root pointer and we're done. */
BS3_XPTR_SET(X86PML4, XPtrPml4, pPml4);
g_PhysPagingRootLM = BS3_XPTR_GET_FLAT(X86PML4, XPtrPml4);
return VINF_SUCCESS;
}
BS3_ASSERT(false);
Bs3MemFree(pPdPtr, _4K);
}
BS3_ASSERT(false);
Bs3MemFree(pPml4, _4K);
}
BS3_ASSERT(false);
return VERR_NO_MEMORY;
}
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