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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/* $Id: bs3-cmn-PagingSetupCanonicalTraps.c $ */
/** @file
* BS3Kit - Bs3PagingSetupCanonicalTraps
*/
/*
* 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 Bs3PagingSetupCanonicalTraps
BS3_CMN_PROTO_STUB(void BS3_FAR *, Bs3PagingSetupCanonicalTraps,(void))
{
if (g_uBs3CpuDetected & BS3CPU_F_LONG_MODE)
{
#if ARCH_BITS == 16
if (!BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode))
#endif
{
uint8_t BS3_FAR *pb;
X86PTEPAE BS3_FAR *paLoPtes;
X86PTEPAE BS3_FAR *paHiPtes;
int rc;
/* Already initialized? Likely. */
if (g_cbBs3PagingCanonicalTraps != 0)
return Bs3XptrFlatToCurrent(g_uBs3PagingCanonicalTrapsAddr);
/* Initialize AMD64 page tables if necessary (unlikely). */
if (g_PhysPagingRootLM == UINT32_MAX)
{
rc = Bs3PagingInitRootForLM();
if (RT_FAILURE(rc))
return NULL;
}
/*
* Get the page table entries first to avoid having to unmap things.
*/
paLoPtes = bs3PagingGetPaePte(g_PhysPagingRootLM, BS3_MODE_LM64, UINT64_C(0x00007fffffffe000), false, &rc);
paHiPtes = bs3PagingGetPaePte(g_PhysPagingRootLM, BS3_MODE_LM64, UINT64_C(0xffff800000000000), false, &rc);
if (!paHiPtes || !paLoPtes)
{
Bs3TestPrintf("warning: Bs3PagingSetupCanonicalTraps - failed to get PTEs!\n");
return NULL;
}
/*
* Allocate the buffer. Currently using 8KB on each side.
*/
pb = (uint8_t BS3_FAR *)Bs3MemAlloc(BS3MEMKIND_TILED, X86_PAGE_SIZE * 4);
if (pb)
{
RTCCUINTXREG uFlat = Bs3SelPtrToFlat(pb);
/*
* Inject it into the page tables.
*/
paLoPtes[0].u &= ~X86_PTE_PAE_PG_MASK;
paLoPtes[0].u |= uFlat + X86_PAGE_SIZE * 0;
paLoPtes[1].u &= ~X86_PTE_PAE_PG_MASK;
paLoPtes[1].u |= uFlat + X86_PAGE_SIZE * 1;
paHiPtes[0].u &= ~X86_PTE_PAE_PG_MASK;
paHiPtes[0].u |= uFlat + X86_PAGE_SIZE * 2;
paHiPtes[1].u &= ~X86_PTE_PAE_PG_MASK;
paHiPtes[1].u |= uFlat + X86_PAGE_SIZE * 3;
ASMReloadCR3();
/*
* Update globals and return successfully.
*/
g_uBs3PagingCanonicalTrapsAddr = uFlat;
g_cbBs3PagingCanonicalTraps = X86_PAGE_SIZE * 4;
g_cbBs3PagingOneCanonicalTrap = X86_PAGE_SIZE * 2;
return pb;
}
Bs3TestPrintf("warning: Bs3PagingSetupCanonicalTraps - out of memory (mode %#x)\n", g_bBs3CurrentMode);
}
#if ARCH_BITS == 16
else
Bs3TestPrintf("warning: Bs3PagingSetupCanonicalTraps was called in RM or V86 mode (%#x)!\n", g_bBs3CurrentMode);
#endif
}
return NULL;
}
|
