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
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
; $Id: RTR0Os2DHQueryDOSVar.asm $
;; @file
; IPRT - DevHelp_GetDOSVar, Ring-0 Driver, OS/2.
;
;
; Copyright (c) 1999-2007 knut st. osmundsen <bird-src-spam@anduin.net>
;
; Permission is hereby granted, free of charge, to any person
; obtaining a copy of this software and associated documentation
; files (the "Software"), to deal in the Software without
; restriction, including without limitation the rights to use,
; copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the
; Software is furnished to do so, subject to the following
; conditions:
;
; The above copyright notice and this permission notice shall be
; included in all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
; OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
; OTHER DEALINGS IN THE SOFTWARE.
;
;*******************************************************************************
;* Header Files *
;*******************************************************************************
%define RT_INCL_16BIT_SEGMENTS
%include "iprt/asmdefs.mac"
%include "iprt/err.mac"
;*******************************************************************************
;* External Symbols *
;*******************************************************************************
extern KernThunkStackTo32
extern KernThunkStackTo16
extern NAME(g_fpfnDevHlp)
;*******************************************************************************
;* Defined Constants And Macros *
;*******************************************************************************
%define DevHlp_GetDOSVar 24h
BEGINCODE
;
; Jump table used by RTR0Os2DHQueryDOSVar
;
DosVarJumpTab:
dd 0 ; 0 - Reserved
dd Load1600 ; 1 - GIS
dd Load1616 ; 2 - LIS
dd 0 ; 3 - Reserved
dd Load1616 ; 4 - VectorSDF
dd Load1616 ; 5 - VectorReboot
dd Load1616 ; 6 - VectorMSATS
dd AsIs ; 7 - YieldFlag (Resched)
dd AsIs ; 8 - TCYieldFlag (TCResched)
dd AsIs ; 9 - DOSTable
dd Load1616 ; a - VectorDEKKO
dd AsIs ; b - CodePgBuff
dd Load1616 ; c - VectorRIPL
dd AsIs ; d - InterruptLevel
dd AsIs ; e - DevClassTables
dd AsIs ; f - DMQS_Sel
dd AsIs ;10 - APMInfo
dd LoadWord ;11 - APM_Length (length of above structure)
DosVarJumpTabEnd:
%define DosVarJumpTabSize (DosVarJumpTabEnd - DosVarJumpTab) / 4
;;
; Unified DevHelp_GetDOSVar -> Far 16:16 pointer wrapper.
;
; @param iVar [ebp + 08h] Variable.
; @param iMember [ebp + 0ch] Member.
; @param pfp [ebp + 10h] Where to store the variable address (pointer to 16:16).
;
BEGINPROC_EXPORTED RTR0Os2DHQueryDOSVar
; switch stack first.
call KernThunkStackTo16
; normal prolog.
push ebp
mov ebp, esp
push dword [NAME(g_fpfnDevHlp)] ; ebp - 4
push ebx ; save ebx
push es ; save es
; setup the devhelp call and switch to
mov eax, [ebp + 08h] ; iVar (8-bit)
mov ecx, [ebp + 0ch] ; iMember (16-bit)
mov dl, DevHlp_GetDOSVar
; jump to the 16-bit code.
;jmp far dword NAME(RTR0Os2DHQueryDOSVar_16) wrt CODE16
db 066h
db 0eah
dw NAME(RTR0Os2DHQueryDOSVar_16) wrt CODE16
dw CODE16
BEGINCODE16
GLOBALNAME RTR0Os2DHQueryDOSVar_16
call far [ss:ebp - 4]
;jmp far dword NAME(RTR0Os2DHQueryDOSVar) wrt FLAT
db 066h
db 0eah
dd NAME(RTR0Os2DHQueryDOSVar_32) ;wrt FLAT
dw TEXT32 wrt FLAT
BEGINCODE
GLOBALNAME RTR0Os2DHQueryDOSVar_32
jc Error1
;
; Make ax:ebx contain the pointer and take action according
; to the variable jump table.
;
and ebx, 0000ffffh ; clean high part of ebx
movzx ecx, byte [ebp + 08] ; iVar
cmp ecx, DosVarJumpTabSize
jg Error2
jmp [DosVarJumpTab + ecx * 4]
; Load Word at ax:ebx.
LoadWord:
mov es, ax
movzx edx, word [es:ebx]
jmp StoreIt
; Load selector at ax:ebx.
Load1600:
mov es, ax
movzx edx, word [es:ebx]
shl edx, 16
jmp StoreIt
; Load 16:16 ptr at ax:ebx.
Load1616:
mov es, ax
mov edx, dword [es:ebx]
jmp StoreIt
; Move ax:bx into edx.
AsIs:
mov dx, ax
shl edx, 16
mov dx, bx
jmp StoreIt
Error2:
mov eax, VERR_INVALID_PARAMETER
jmp Done
Error1:
mov eax, VERR_GENERAL_FAILURE
jmp Done
StoreIt:
mov ecx, [ebp + 10h]
mov [ecx], edx
xor eax, eax ; return success (VINF_SUCCESS == 0)
Done:
pop es
pop ebx
leave
; switch stack back and return.
push eax
call KernThunkStackTo32
pop eax
ret
ENDPROC RTR0Os2DHQueryDOSVar
|
