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/* $Id: bs3-cmn-PagingProtect.c $ */
/** @file
* BS3Kit - Bs3PagingProtect
*/
/*
* 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>
#include <iprt/param.h>
/*********************************************************************************************************************************
* Defined Constants And Macros *
*********************************************************************************************************************************/
#if 0
# define BS3PAGING_DPRINTF1(a) Bs3TestPrintf a
#else
# define BS3PAGING_DPRINTF1(a) do { } while (0)
#endif
#if 0
# define BS3PAGING_DPRINTF2(a) Bs3TestPrintf a
#else
# define BS3PAGING_DPRINTF2(a) do { } while (0)
#endif
static void *bs3PagingBuildPaeTable(uint64_t uTmpl, uint64_t cbIncrement, BS3MEMKIND enmKind, int *prc)
{
uint64_t BS3_FAR *pau64 = (uint64_t BS3_FAR *)Bs3MemAlloc(enmKind, _4K);
if (pau64)
{
unsigned i;
for (i = 0; i < _4K / sizeof(uint64_t); i++, uTmpl += cbIncrement)
pau64[i] = uTmpl;
}
else
*prc = VERR_NO_MEMORY;
return pau64;
}
#undef bs3PagingGetLegacyPte
BS3_CMN_DEF(X86PTE BS3_FAR *, bs3PagingGetLegacyPte,(RTCCUINTXREG cr3, uint32_t uFlat, bool fUseInvlPg, int *prc))
{
X86PTE BS3_FAR *pPTE = NULL;
#if TMPL_BITS == 16
uint32_t const uMaxAddr = BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode) ? _1M - 1 : BS3_SEL_TILED_AREA_SIZE - 1;
#else
uint32_t const uMaxAddr = UINT32_MAX;
#endif
BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: cr3=%RX32 uFlat=%RX32 uMaxAddr=%RX32\n", (uint32_t)cr3, uFlat, uMaxAddr));
*prc = VERR_OUT_OF_RANGE;
if (cr3 <= uMaxAddr)
{
unsigned const iPde = (uFlat >> X86_PD_SHIFT) & X86_PD_MASK;
PX86PD const pPD = (PX86PD)Bs3XptrFlatToCurrent(cr3 & X86_CR3_PAGE_MASK);
BS3_ASSERT(pPD->a[iPde].b.u1Present);
if (pPD->a[iPde].b.u1Present)
{
unsigned const iPte = (uFlat >> X86_PT_SHIFT) & X86_PT_MASK;
BS3_ASSERT(pPD->a[iPde].b.u1Present);
BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: pPD=%p iPde=%#x: %#RX32\n", pPD, iPde, pPD->a[iPde]));
if (pPD->a[iPde].b.u1Present)
{
if (!pPD->a[iPde].b.u1Size)
{
if (pPD->a[iPde].u <= uMaxAddr)
pPTE = &((X86PT BS3_FAR *)Bs3XptrFlatToCurrent(pPD->a[iPde].u & ~(uint32_t)PAGE_OFFSET_MASK))->a[iPte];
else
BS3PAGING_DPRINTF1(("bs3PagingGetLegacyPte: out of range! iPde=%#x: %#x\n", iPde, pPD->a[iPde].u));
}
else
{
X86PT BS3_FAR *pPT;
uint32_t uPte = (pPD->a[iPde].u & ~(uint32_t)(X86_PDE4M_PS | X86_PDE4M_G | X86_PDE4M_PG_HIGH_MASK)) \
| X86_PTE_D;
if (pPD->a[iPde].b.u1Global)
uPte |= X86_PTE_G;
if (pPD->a[iPde].b.u1PAT)
uPte |= X86_PTE_PAT;
pPT = (X86PT BS3_FAR *)bs3PagingBuildPaeTable(RT_MAKE_U64(uPte, uPte | PAGE_SIZE),
RT_MAKE_U64(PAGE_SIZE*2, PAGE_SIZE*2),
uMaxAddr > _1M ? BS3MEMKIND_TILED : BS3MEMKIND_REAL, prc);
BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: Built pPT=%p uPte=%RX32\n", pPT, uPte));
if (pPT)
{
ASMAtomicUoWriteU32(&pPD->a[iPde].u,
Bs3SelPtrToFlat(pPT)
| ( pPD->a[iPde].u
& ~(uint32_t)(X86_PTE_PG_MASK | X86_PDE4M_PS | X86_PDE4M_G | X86_PDE4M_D)));
BS3PAGING_DPRINTF2(("bs3PagingGetLegacyPte: iPde=%#x: %#RX32\n", iPde, pPD->a[iPde].u));
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
pPTE = &pPT->a[iPte];
}
}
}
}
}
else
BS3PAGING_DPRINTF1(("bs3PagingGetLegacyPte: out of range! cr3=%#x\n", cr3));
return pPTE;
}
/**
* Get the PTE for an address, given a PAE or long mode CR3.
*
* @returns Pointer to the PTE on success, NULL on failure.
* @param cr3 The CR3.
* @param bMode Indicates whether it's PAE or long mode.
* @param uFlat The address for which we want the PTE.
* @param fUseInvlPg Whether we can use invalidate page when
* replacing large pages.
* @param prc Updated only on failure.
*/
#undef bs3PagingGetPaePte
BS3_CMN_DEF(X86PTEPAE BS3_FAR *, bs3PagingGetPaePte,(RTCCUINTXREG cr3, uint8_t bMode, uint64_t uFlat, bool fUseInvlPg, int *prc))
{
X86PTEPAE BS3_FAR *pPTE = NULL;
#if TMPL_BITS == 16
uint32_t const uMaxAddr = BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode) ? _1M - 1 : BS3_SEL_TILED_AREA_SIZE - 1;
#else
uintptr_t const uMaxAddr = ~(uintptr_t)0;
#endif
*prc = VERR_OUT_OF_RANGE;
if ((cr3 & X86_CR3_AMD64_PAGE_MASK) <= uMaxAddr)
{
X86PDPAE BS3_FAR *pPD;
if (BS3_MODE_IS_64BIT_SYS(bMode))
{
unsigned const iPml4e = (uFlat >> X86_PML4_SHIFT) & X86_PML4_MASK;
X86PML4 BS3_FAR *pPml4 = (X86PML4 BS3_FAR *)Bs3XptrFlatToCurrent(cr3 & X86_CR3_AMD64_PAGE_MASK);
BS3_ASSERT(pPml4->a[iPml4e].n.u1Present);
if ((pPml4->a[iPml4e].u & X86_PML4E_PG_MASK) <= uMaxAddr)
{
unsigned const iPdpte = (uFlat >> X86_PDPT_SHIFT) & X86_PDPT_MASK_AMD64;
X86PDPT BS3_FAR *pPdpt = (X86PDPT BS3_FAR *)Bs3XptrFlatToCurrent(pPml4->a[iPml4e].u & X86_PML4E_PG_MASK);
BS3_ASSERT(pPdpt->a[iPdpte].n.u1Present);
if (!pPdpt->a[iPdpte].b.u1Size)
{
if ((pPdpt->a[iPdpte].u & X86_PDPE_PG_MASK) <= uMaxAddr)
pPD = (X86PDPAE BS3_FAR *)Bs3XptrFlatToCurrent(pPdpt->a[iPdpte].u & ~(uint64_t)PAGE_OFFSET_MASK);
else
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! iPdpte=%#x: %RX64 max=%RX32\n",
iPdpte, pPdpt->a[iPdpte].u, (uint32_t)uMaxAddr));
}
else
{
/* Split 1GB page. */
pPD = (X86PDPAE BS3_FAR *)bs3PagingBuildPaeTable(pPdpt->a[iPdpte].u, _2M,
uMaxAddr > _1M ? BS3MEMKIND_TILED : BS3MEMKIND_REAL, prc);
if (pPD)
{
ASMAtomicUoWriteU64(&pPdpt->a[iPdpte].u,
Bs3SelPtrToFlat(pPD)
| ( pPdpt->a[iPdpte].u
& ~(uint64_t)(X86_PDPE_PG_MASK | X86_PDE4M_PS | X86_PDE4M_G | X86_PDE4M_D)));
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
}
}
}
}
//else if (uFlat <= UINT32_MAX) - fixme!
else if (!(uFlat >> 32))
{
unsigned const iPdpte = ((uint32_t)uFlat >> X86_PDPT_SHIFT) & X86_PDPT_MASK_PAE;
X86PDPT BS3_FAR *pPdpt = (X86PDPT BS3_FAR *)Bs3XptrFlatToCurrent(cr3 & X86_CR3_PAE_PAGE_MASK);
BS3_ASSERT(pPdpt->a[iPdpte].n.u1Present);
if ((pPdpt->a[iPdpte].u & X86_PDPE_PG_MASK) <= uMaxAddr)
pPD = (X86PDPAE BS3_FAR *)Bs3XptrFlatToCurrent(pPdpt->a[iPdpte].u & X86_PDPE_PG_MASK);
else
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! iPdpte=%#x: %RX64 max=%RX32\n",
iPdpte, pPdpt->a[iPdpte].u, (uint32_t)uMaxAddr));
}
else
{
pPD = NULL;
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! uFlat=%#RX64 max=%RX32\n", uFlat, (uint32_t)uMaxAddr));
}
if (pPD)
{
unsigned const iPte = (uFlat >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK;
unsigned const iPde = (uFlat >> X86_PD_PAE_SHIFT) & X86_PD_PAE_MASK;
if (!pPD->a[iPde].b.u1Size)
{
if ((pPD->a[iPde].u & X86_PDE_PAE_PG_MASK) <= uMaxAddr)
pPTE = &((X86PTPAE BS3_FAR *)Bs3XptrFlatToCurrent(pPD->a[iPde].u & ~(uint64_t)PAGE_OFFSET_MASK))->a[iPte];
else
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! iPde=%#x: %RX64 max=%RX32\n",
iPde, pPD->a[iPde].u, (uint32_t)uMaxAddr));
}
else
{
/* Split 2MB page. */
X86PTPAE BS3_FAR *pPT;
uint64_t uTmpl = pPD->a[iPde].u & ~(uint64_t)(X86_PDE4M_G | X86_PDE4M_PS | X86_PDE4M_PAT);
if (!pPD->a[iPde].b.u1Global)
uTmpl |= X86_PTE_G;
if (!pPD->a[iPde].b.u1PAT)
uTmpl |= X86_PTE_PAT;
pPT = (X86PTPAE BS3_FAR *)bs3PagingBuildPaeTable(uTmpl, PAGE_SIZE,
uMaxAddr > _1M ? BS3MEMKIND_TILED : BS3MEMKIND_REAL, prc);
if (pPT)
{
ASMAtomicUoWriteU64(&pPD->a[iPde].u,
Bs3SelPtrToFlat(pPT)
| ( pPD->a[iPde].u
& ~(uint64_t)(X86_PTE_PAE_PG_MASK | X86_PDE4M_PS | X86_PDE4M_G | X86_PDE4M_D)));
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
pPTE = &pPT->a[iPte];
}
}
}
}
else
BS3PAGING_DPRINTF1(("bs3PagingGetPaePte: out of range! cr3=%#RX32 uMaxAddr=%#RX32\n", (uint32_t)cr3, (uint32_t)uMaxAddr));
return pPTE;
}
#undef Bs3PagingProtect
BS3_CMN_DEF(int, Bs3PagingProtect,(uint64_t uFlat, uint64_t cb, uint64_t fSet, uint64_t fClear))
{
#if ARCH_BITS == 16
if (!BS3_MODE_IS_V86(g_bBs3CurrentMode))
#endif
{
RTCCUINTXREG const cr3 = ASMGetCR3();
RTCCUINTXREG const cr4 = g_uBs3CpuDetected & BS3CPU_F_CPUID ? ASMGetCR4() : 0;
bool const fLegacyPTs = !(cr4 & X86_CR4_PAE);
bool const fUseInvlPg = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486
&& ( cb < UINT64_C(16)*PAGE_SIZE
|| (cr4 & X86_CR4_PGE));
unsigned cEntries;
int rc;
/*
* Adjust the range parameters.
*/
cb += uFlat & PAGE_OFFSET_MASK;
cb = RT_ALIGN_64(cb, PAGE_SIZE);
uFlat &= ~(uint64_t)PAGE_OFFSET_MASK;
fSet &= ~X86_PTE_PAE_PG_MASK;
fClear &= ~X86_PTE_PAE_PG_MASK;
BS3PAGING_DPRINTF1(("Bs3PagingProtect: uFlat=%RX64 cb=%RX64 fSet=%RX64 fClear=%RX64 %s %s\n", uFlat, cb, fSet, fClear,
fLegacyPTs ? "legacy" : "pae/amd64", fUseInvlPg ? "invlpg" : "reload-cr3"));
if (fLegacyPTs)
{
/*
* Legacy page tables.
*/
while ((uint32_t)cb > 0)
{
PX86PTE pPte = BS3_CMN_FAR_NM(bs3PagingGetLegacyPte)(cr3, (uint32_t)uFlat, fUseInvlPg, &rc);
if (!pPte)
return rc;
cEntries = X86_PG_ENTRIES - ((uFlat >> X86_PT_SHIFT) & X86_PT_MASK);
while (cEntries-- > 0 && cb > 0)
{
pPte->u &= ~(uint32_t)fClear;
pPte->u |= (uint32_t)fSet;
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
pPte++;
uFlat += PAGE_SIZE;
cb -= PAGE_SIZE;
}
}
}
else
{
/*
* Long mode or PAE page tables (at this level they are the same).
*/
while (cb > 0)
{
PX86PTEPAE pPte = BS3_CMN_FAR_NM(bs3PagingGetPaePte)(cr3, g_bBs3CurrentMode, uFlat, fUseInvlPg, &rc);
if (!pPte)
return rc;
cEntries = X86_PG_ENTRIES - ((uFlat >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK);
while (cEntries-- > 0 && cb > 0)
{
pPte->u &= ~fClear;
pPte->u |= fSet;
if (fUseInvlPg)
ASMInvalidatePage(uFlat);
pPte++;
uFlat += PAGE_SIZE;
cb -= PAGE_SIZE;
}
}
}
/*
* Flush the TLB if we didn't use INVLPG above.
*/
BS3PAGING_DPRINTF2(("Bs3PagingProtect: reloading cr3=%RX32\n", (uint32_t)cr3));
//if (!fUseInvlPg)
ASMSetCR3(cr3);
BS3PAGING_DPRINTF2(("Bs3PagingProtect: reloaded cr3=%RX32\n", (uint32_t)cr3));
}
#if ARCH_BITS == 16
/*
* We can do this stuff in v8086 mode.
*/
else
return Bs3SwitchFromV86To16BitAndCallC((FPFNBS3FAR)Bs3PagingProtect_f16, sizeof(uint64_t) * 4, uFlat, cb, fSet, fClear);
#endif
return VINF_SUCCESS;
}
#undef Bs3PagingProtectPtr
BS3_CMN_DEF(int, Bs3PagingProtectPtr,(void *pv, size_t cb, uint64_t fSet, uint64_t fClear))
{
#if ARCH_BITS == 16
return BS3_CMN_NM(Bs3PagingProtect)(Bs3SelPtrToFlat(pv), cb, fSet, fClear);
#else
return BS3_CMN_NM(Bs3PagingProtect)((uintptr_t)pv, cb, fSet, fClear);
#endif
}
#undef Bs3PagingGetPte
BS3_CMN_DEF(void BS3_FAR *, Bs3PagingGetPte,(uint64_t uFlat, int *prc))
{
RTCCUINTXREG const cr3 = ASMGetCR3();
RTCCUINTXREG const cr4 = g_uBs3CpuDetected & BS3CPU_F_CPUID ? ASMGetCR4() : 0;
bool const fLegacyPTs = !(cr4 & X86_CR4_PAE);
bool const fUseInvlPg = (g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80486;
int rc;
if (!prc)
prc = &rc;
if (!fLegacyPTs)
return BS3_CMN_FAR_NM(bs3PagingGetPaePte)(cr3, g_bBs3CurrentMode, uFlat, fUseInvlPg, prc);
if (uFlat < _4G)
return BS3_CMN_FAR_NM(bs3PagingGetLegacyPte)(cr3, (uint32_t)uFlat, fUseInvlPg, prc);
*prc = VERR_OUT_OF_RANGE;
return NULL;
}
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