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/* $Id: bs3-cmn-PagingAlias.c $ */
/** @file
* BS3Kit - Bs3PagingAlias, Bs3PagingUnalias
*/
/*
* 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"
#include "iprt/asm-amd64-x86.h"
#undef Bs3PagingAlias
BS3_CMN_DEF(int, Bs3PagingAlias,(uint64_t uDst, uint64_t uPhysToAlias, uint32_t cbHowMuch, uint64_t fPte))
{
#if ARCH_BITS == 16
if (!BS3_MODE_IS_V86(g_bBs3CurrentMode))
#endif
{
RTCCUINTXREG cr3 = ASMGetCR3();
uint32_t cPages;
int rc;
/*
* Validate and adjust the input a little.
*/
if (uDst & X86_PAGE_OFFSET_MASK)
{
cbHowMuch += X86_PAGE_SIZE - (uDst & X86_PAGE_OFFSET_MASK);
uDst &= ~(uint64_t)X86_PAGE_OFFSET_MASK;
}
uPhysToAlias &= X86_PTE_PAE_PG_MASK;
fPte &= ~(X86_PTE_PAE_MBZ_MASK_NX | X86_PTE_PAE_PG_MASK);
cbHowMuch = RT_ALIGN_32(cbHowMuch, X86_PAGE_SIZE);
cPages = cbHowMuch >> X86_PAGE_SHIFT;
//Bs3TestPrintf("Bs3PagingAlias: adjusted: uDst=%RX64 uPhysToAlias=%RX64 cbHowMuch=%RX32 fPte=%Rx64 cPages=%RX32\n", uDst, uPhysToAlias, cbHowMuch, fPte, cPages);
if (BS3_MODE_IS_LEGACY_PAGING(g_bBs3CurrentMode))
{
X86PTE BS3_FAR *pPteLegacy;
uint32_t uDst32 = (uint32_t)uDst;
uint32_t uPhysToAlias32 = (uint32_t)uPhysToAlias;
if (uDst32 != uDst)
{
Bs3TestPrintf("warning: Bs3PagingAlias - uDst=%RX64 is out of range for legacy paging!\n", uDst);
return VERR_INVALID_PARAMETER;
}
if (uPhysToAlias32 != uPhysToAlias)
{
Bs3TestPrintf("warning: Bs3PagingAlias - uPhysToAlias=%RX64 is out of range for legacy paging!\n", uPhysToAlias);
return VERR_INVALID_PARAMETER;
}
/*
* Trigger page table splitting first.
*/
while (cPages > 0)
{
pPteLegacy = bs3PagingGetLegacyPte(cr3, uDst32, false, &rc);
if (pPteLegacy)
{
uint32_t cLeftInPt = X86_PG_ENTRIES - ((uDst32 >> X86_PT_SHIFT) & X86_PT_MASK);
if (cPages <= cLeftInPt)
break;
uDst32 += cLeftInPt << X86_PAGE_SHIFT;
cPages -= cLeftInPt;
}
else
{
Bs3TestPrintf("warning: Bs3PagingAlias - bs3PagingGetLegacyPte failed: rc=%d\n", rc);
return rc;
}
}
/*
* Make the changes.
*/
cPages = cbHowMuch >> X86_PAGE_SHIFT;
uDst32 = (uint32_t)uDst;
while (cPages > 0)
{
uint32_t cLeftInPt = X86_PG_ENTRIES - ((uDst32 >> X86_PT_SHIFT) & X86_PT_MASK);
pPteLegacy = bs3PagingGetLegacyPte(cr3, uDst32, false, &rc);
while (cLeftInPt > 0 && cPages > 0)
{
pPteLegacy->u = uPhysToAlias32 | (uint32_t)fPte;
pPteLegacy++;
uDst32 += X86_PAGE_SIZE;
uPhysToAlias32 += X86_PAGE_SIZE;
cPages--;
cLeftInPt--;
}
}
}
else
{
X86PTEPAE BS3_FAR *pPtePae;
uint64_t const uDstSaved = uDst;
/*
* Trigger page table splitting first.
*/
while (cPages > 0)
{
pPtePae = bs3PagingGetPaePte(cr3, g_bBs3CurrentMode, uDst, false, &rc);
if (pPtePae)
{
uint32_t cLeftInPt = X86_PG_PAE_ENTRIES - ((uDst >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK);
if (cPages <= cLeftInPt)
break;
cPages -= cLeftInPt;
uDst += cLeftInPt << X86_PAGE_SHIFT;
}
else
{
Bs3TestPrintf("warning: Bs3PagingAlias - bs3PagingGetLegacyPte failed: rc=%d\n", rc);
return rc;
}
}
/*
* Make the changes.
*/
cPages = cbHowMuch >> X86_PAGE_SHIFT;
uDst = uDstSaved;
while (cPages > 0)
{
uint32_t cLeftInPt = X86_PG_PAE_ENTRIES - ((uDst >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK);
pPtePae = bs3PagingGetPaePte(cr3, g_bBs3CurrentMode, uDst, false, &rc);
while (cLeftInPt > 0 && cPages > 0)
{
pPtePae->u = uPhysToAlias | fPte;
pPtePae++;
uDst += X86_PAGE_SIZE;
uPhysToAlias += X86_PAGE_SIZE;
cPages--;
cLeftInPt--;
}
}
}
ASMReloadCR3();
}
#if ARCH_BITS == 16
/*
* We can't do this stuff in v8086 mode, so switch to 16-bit prot mode and do it there.
*/
else
return Bs3SwitchFromV86To16BitAndCallC((FPFNBS3FAR)Bs3PagingAlias_f16, sizeof(uint64_t)*3 + sizeof(uint32_t),
uDst, uPhysToAlias, cbHowMuch, fPte);
#endif
return VINF_SUCCESS;
}
#undef Bs3PagingUnalias
BS3_CMN_DEF(int, Bs3PagingUnalias,(uint64_t uDst, uint32_t cbHowMuch))
{
return BS3_CMN_NM(Bs3PagingAlias)(uDst, uDst, cbHowMuch, X86_PTE_P | X86_PTE_RW | X86_PTE_US | X86_PTE_A | X86_PTE_D);
}
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