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
|
/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2001 Kevin P. Lawton
*
* mon-mode.c: Handling of mode to run guest code in.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* TODO:
* - kick out of RMMonPM when descriptor caches are compat w/ RM
* (and switch to differnet virtualization matrix)
*/
#include "plex86.h"
#define IN_MONITOR_SPACE
#include "monitor.h"
#warning "need to deal with LGDT for siv==0"
void
monModeChange(vm_t *vm)
{
if (vm->modeChange & ModeChangeRequestMapVSegs) {
copyGuestDescToMon(vm, SRegES);
copyGuestDescToMon(vm, SRegCS);
copyGuestDescToMon(vm, SRegSS);
copyGuestDescToMon(vm, SRegDS);
copyGuestDescToMon(vm, SRegFS);
copyGuestDescToMon(vm, SRegGS);
vm->modeChange &= ~ModeChangeRequestMapVSegs;
}
#if 0
if (vm->modeChange & ModeChangeEventCS) {
unsigned newGuestMode;
/* If the monitor saw an event which may change the mode of
* the guest, such as a CS register reload, than have a look.
*/
if (V8086Mode(vm))
newGuestMode = GuestModeVM;
else if (RealMode(vm))
newGuestMode = GuestModeRM;
else {
newGuestMode = GuestModePMR0 | G_GetCPL(vm);
}
if (GetGuestMode(vm) != newGuestMode) {
/* Yep, the guest's mode changed. Flag this as a transition. */
vm->modeChange |= ModeChangeEventTransition;
}
}
#endif
/* If we don't need remap due to a guest mode change, then
* skip the following code, and check for the need for a
* paging remap.
*/
if ( !(vm->modeChange & ModeChangeEventTransition) )
goto pageRemapCheck;
sysRemapMonitor(vm);
pageRemapCheck:
/* First set EFLAGS.VM bit according to the mode that the guest
* will be executed in.
*/
//if (GetMonMode(vm) == MonModeVM)
// vm->guest.addr.guest_context->eflags.fields.vm = 1;
//else
vm->guest.addr.guest_context->eflags.fields.vm = 0;
/* If there was a request for a paging remap, handle that now */
if (vm->modeChange & ModeChangeRequestPaging) {
monPagingRemap(vm);
}
/* We will get there due to the following conditions:
* - CS change
* - Guest paging (and thus linear address space) changes
* - Mode switch
* These conditions require a flush of the hash tables used by
* the DT architecture because they are based on EIP offsets
* from CS.base, and the current linear address space.
*
* xxx However, we will also get here due to:
* xxx - Monitor paging remap (monPagingRemap)
* xxx I'm not sure that we need to flush tables for that alone.
* xxx Maybe we do because of A20 changes etc.
*/
//dtInitHashTables(vm);
/* All mode changes have been handled, reset flag */
vm->modeChange = 0;
}
|
