1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/* $Id: bs3-cmn-PagingInitRootForPAE.c $ */
/** @file
* BS3Kit - Bs3PagingInitRootForPAE
*/
/*
* 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"
#undef Bs3PagingInitRootForPAE
BS3_CMN_DEF(int, Bs3PagingInitRootForPAE,(void))
{
X86PDPT BS3_FAR *pPdPtr;
BS3_ASSERT(g_PhysPagingRootPAE == UINT32_MAX);
/*
* By default we do a identity mapping of the entire address space
* using 2 GB pages. So, we need four page directories and one page
* directory pointer table with 4 entries. (We cannot share the PDPT with
* long mode because of reserved bit which will cause fatal trouble.)
*
* We assume that the availability of PAE means that PSE is available too.
*/
/** @todo testcase: loading invalid PDPTREs will tripple fault the CPU, won't it? We guru with invalid guest state. */
pPdPtr = (X86PDPT BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, sizeof(X86PDPE) * 4U);
if (pPdPtr)
{
X86PDPAE BS3_FAR *paPgDirs;
BS3_ASSERT(((uintptr_t)pPdPtr & 0x3f) == 0);
paPgDirs = (X86PDPAE BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, _4K * 4U);
if (paPgDirs)
{
unsigned i;
BS3_XPTR_AUTO(X86PDPT, XPtrPdPtr);
BS3_XPTR_AUTO(X86PDPAE, XPtrPgDirs);
/* Set up the 2048 2MB pages first. */
for (i = 0; i < RT_ELEMENTS(paPgDirs->a) * 4U; i++)
paPgDirs->a[i].u = ((uint32_t)i << X86_PD_PAE_SHIFT)
| X86_PDE4M_P | X86_PDE4M_RW | X86_PDE4M_US | X86_PDE4M_PS | X86_PDE4M_A | X86_PDE4M_D;
/* Set up the four page directory pointer table entries. */
BS3_XPTR_SET(X86PDPAE, XPtrPgDirs, paPgDirs);
pPdPtr->a[0].u = BS3_XPTR_GET_FLAT(X86PDPAE, XPtrPgDirs) | X86_PDPE_P;
pPdPtr->a[1].u = pPdPtr->a[0].u + _4K;
pPdPtr->a[2].u = pPdPtr->a[1].u + _4K;
pPdPtr->a[3].u = pPdPtr->a[2].u + _4K;
/* Free up 8 consequtive entries for raw-mode hypervisor code. */
if (1) /** @todo detect raw-mode and only do this then. */
for (i = 0; i < 8; i++)
paPgDirs->a[i + (UINT32_C(0xc0000000) >> X86_PD_PAE_SHIFT)].b.u1Present = 0;
/* Set the global root pointer and we're done. */
BS3_XPTR_SET(X86PDPT, XPtrPdPtr, pPdPtr);
g_PhysPagingRootPAE = BS3_XPTR_GET_FLAT(X86PDPT, XPtrPdPtr);
return VINF_SUCCESS;
}
BS3_ASSERT(false);
Bs3MemFree(pPdPtr, _4K);
}
BS3_ASSERT(false);
return VERR_NO_MEMORY;
}
|
