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/* $Id: bs3-cmn-PagingInitRootForPP.c $ */
/** @file
* BS3Kit - Bs3PagingInitRootForPP
*/
/*
* 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 "bs3-cmn-memory.h" /* bad bird */
#include <iprt/param.h>
/**
* Creates page tables for a section of the page directory.
*
* @returns VINF_SUCCESS or VERR_NO_MEMORY.
* @param pPgDir The page directory.
* @param iFirst The first PD entry.
* @param cEntries How many PD entries to create pages tables for.
*/
static int Bs3PagingInitPageTablesForPgDir(X86PD BS3_FAR *pPgDir, unsigned iFirst, unsigned cEntries)
{
uint32_t uCurPhys = (uint32_t)iFirst << X86_PD_SHIFT;
while (cEntries--)
{
X86PT BS3_FAR *pPt = (X86PT BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, _4K);
if (pPt)
{
unsigned j = 0;
for (j = 0; j < RT_ELEMENTS(pPt->a); j++, uCurPhys += PAGE_SIZE)
{
pPt->a[j].u = uCurPhys;
pPt->a[j].u |= X86_PTE_P | X86_PTE_RW | X86_PTE_US | X86_PTE_A | X86_PTE_D;
}
pPgDir->a[iFirst].u = Bs3SelPtrToFlat(pPt);
pPgDir->a[iFirst].u |= X86_PDE_P | X86_PDE_RW | X86_PDE_US | X86_PDE_A;
iFirst++;
}
else
return VERR_NO_MEMORY;
}
return VINF_SUCCESS;
}
#undef Bs3PagingInitRootForPP
BS3_CMN_DEF(int, Bs3PagingInitRootForPP,(void))
{
X86PD BS3_FAR *pPgDir;
BS3_ASSERT(g_PhysPagingRootPP == UINT32_MAX);
/*
* By default we do a identity mapping of the entire address space
* using 4 GB pages. So, we only really need one page directory,
* that's all.
*
* ASSUMES page size extension available, i.e. pentium+.
*/
pPgDir = (X86PD BS3_FAR *)Bs3MemAllocZ(BS3MEMKIND_TILED, _4K);
if (pPgDir)
{
BS3_XPTR_AUTO(X86PD, XptrPgDir);
unsigned i;
int rc = VINF_SUCCESS;
if (g_uBs3CpuDetected & BS3CPU_F_PSE)
{
for (i = 0; i < RT_ELEMENTS(pPgDir->a); i++)
{
pPgDir->a[i].u = (uint32_t)i << X86_PD_SHIFT;
pPgDir->a[i].u |= X86_PDE4M_P | X86_PDE4M_RW | X86_PDE4M_US | X86_PDE4M_PS | X86_PDE4M_A | X86_PDE4M_D;
}
/* Free up 4 consequtive entries for raw-mode hypervisor code. */
if (1) /** @todo detect raw-mode and only do this then. */
for (i = 0; i < 4; i++)
pPgDir->a[i + (UINT32_C(0xc0000000) >> X86_PD_SHIFT)].b.u1Present = 0;
}
else
{
/*
* This requires 4MB of page tables if we map everything.
* So, we check how much memory we have available and make sure we
* don't use all of it for page tables.
*/
unsigned cMax = RT_ELEMENTS(pPgDir->a);
uint32_t cFreePages = g_Bs3Mem4KUpperTiled.Core.cFreeChunks + g_Bs3Mem4KLow.Core.cFreeChunks;
if (cFreePages >= cMax + 128)
Bs3PagingInitPageTablesForPgDir(pPgDir, 0, cMax);
else
{
unsigned cTop;
if (cMax >= 256 /*1MB*/)
{
cMax = cFreePages - 128;
cTop = 32;
}
else if (cMax >= 128)
{
cMax = cFreePages - 48;
cTop = 16;
}
else
{
cMax = cFreePages - 16;
cTop = RT_MIN(16, cMax / 4);
}
Bs3TestPrintf("Bs3PagingInitRootForPP: Warning! insufficient memory for mapping all 4GB!\n"
" Will only map 0x00000000-%#010RX32 and %#010RX32-0xffffffff.\n",
(uint32_t)(cMax - cTop) << PAGE_SHIFT, UINT32_MAX - ((uint32_t)cTop << PAGE_SHIFT) + 1);
rc = Bs3PagingInitPageTablesForPgDir(pPgDir, 0, cMax - cTop);
if (RT_SUCCESS(rc))
rc = Bs3PagingInitPageTablesForPgDir(pPgDir, RT_ELEMENTS(pPgDir->a) - cTop, cTop);
}
}
BS3_XPTR_SET(X86PD, XptrPgDir, pPgDir);
g_PhysPagingRootPP = BS3_XPTR_GET_FLAT(X86PD, XptrPgDir);
return rc;
}
Bs3Printf("Bs3PagingInitRootForPP: No memory!\n");
BS3_ASSERT(false);
return VERR_NO_MEMORY;
}
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