diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPP.c')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPP.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPP.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPP.c new file mode 100644 index 00000000..cea59f3a --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PagingInitRootForPP.c @@ -0,0 +1,153 @@ +/* $Id: bs3-cmn-PagingInitRootForPP.c $ */ +/** @file + * BS3Kit - Bs3PagingInitRootForPP + */ + +/* + * Copyright (C) 2007-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE 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. + */ + + +/********************************************************************************************************************************* +* 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; +} + |