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/* $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;
}
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