VirtualBox

source: vbox/trunk/src/VBox/Devices/BiosCommonCode/commondefs.inc@ 103914

Last change on this file since 103914 was 98103, checked in by vboxsync, 21 months ago

Copyright year updates by scm.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 5.1 KB
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1; $Id: commondefs.inc 98103 2023-01-17 14:15:46Z vboxsync $
2;; @file
3; Stuff for drawing the BIOS logo.
4;
5
6;
7; Copyright (C) 2004-2023 Oracle and/or its affiliates.
8;
9; This file is part of VirtualBox base platform packages, as
10; available from https://www.virtualbox.org.
11;
12; This program is free software; you can redistribute it and/or
13; modify it under the terms of the GNU General Public License
14; as published by the Free Software Foundation, in version 3 of the
15; License.
16;
17; This program is distributed in the hope that it will be useful, but
18; WITHOUT ANY WARRANTY; without even the implied warranty of
19; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20; General Public License for more details.
21;
22; You should have received a copy of the GNU General Public License
23; along with this program; if not, see <https://www.gnu.org/licenses>.
24;
25; SPDX-License-Identifier: GPL-3.0-only
26;
27
28
29;; Switches back to default CPU mode.
30SET_DEFAULT_CPU macro
31 if VBOX_BIOS_CPU eq 8086
32 .8086
33 elseif VBOX_BIOS_CPU eq 80186
34 .186
35 elseif VBOX_BIOS_CPU eq 80286
36 .286
37 elseif VBOX_BIOS_CPU eq 80386
38 .386
39 else
40 .errnz 1, Unsupported target CPU value: VBOX_BIOS_CPU
41 .386
42 endif
43endm
44
45
46;; Switches back to default CPU mode, max 286.
47SET_DEFAULT_CPU_286 macro
48 if VBOX_BIOS_CPU eq 8086
49 .8086
50 elseif VBOX_BIOS_CPU eq 80186
51 .186
52 else
53 .286
54 endif
55endm
56
57
58;;
59; Pretends to do a call by pushing the return address and jumping
60; to the function.
61;
62; This is slightly problematic on 8086 since it doesn't support pushing
63; word immediates. OTOH, it support pushing memory, so we'll do that
64; instead when targeting 8086.
65;
66if 0 ;; this crap crashes wasm, makes it call exit(0), or similar weird stuff.
67 ;; switched to a simpler approach where I define the one return address variable myself.
68DO_JMP_CALL macro calling, returning
69 if VBOX_BIOS_CPU gt 8086
70 push returning
71 jmp calling
72 else
73 push word ptr cs:[%jmp_call_addr_&returning]
74 jmp calling
75;public jmp_call_addr_&returning
76%jmp_call_addr_&returning: dw offset retaddr
77 endif
78endm
79
80DO_JMP_CALL_AGAIN macro calling, returning
81 if VBOX_BIOS_CPU gt 8086
82 push returning
83 jmp calling
84 else
85 push word ptr cs:[%jmp_call_addr_&returning]
86 jmp calling
87 endif
88endm
89
90else ; Simplified.
91DO_JMP_CALL_EX macro calling, returning, returning_ptr_var
92 if VBOX_BIOS_CPU gt 8086
93 push returning
94 jmp calling
95 else
96 push word ptr cs:[returning_ptr_var]
97 jmp calling
98 endif
99endm
100
101endif ; Simplified.
102
103
104;; For handling the pusha instruction depending on target CPU.
105DO_pusha macro
106 if VBOX_BIOS_CPU gt 8086
107 pusha
108 else
109 push ax
110 push cx
111 push dx
112 push bx
113 push sp
114 push bp
115 push si
116 push di
117 endif
118endm
119
120
121;; For handling the popad/popa instruction depending on target CPU.
122DO_popa macro
123 if VBOX_BIOS_CPU gt 8086
124 popa
125 else
126 pop di
127 pop si
128 pop bp
129 pop bx ;pop sp
130 pop bx
131 pop dx
132 pop cx
133 pop ax
134 endif
135endm
136
137
138;; For handling the pushad/pusha instruction depending on target CPU.
139DO_PUSHAD macro
140 if VBOX_BIOS_CPU ge 80386
141 pushad
142 elseif VBOX_BIOS_CPU gt 8086
143 pusha
144 else
145 push ax
146 push cx
147 push dx
148 push bx
149 push sp
150 push bp
151 push si
152 push di
153 endif
154endm
155
156
157;; For handling the popad/popa instruction depending on target CPU.
158DO_POPAD macro
159 if VBOX_BIOS_CPU ge 80386
160 popad
161 elseif VBOX_BIOS_CPU gt 8086
162 popa
163 else
164 pop di
165 pop si
166 pop bp
167 pop bx ;pop sp
168 pop bx
169 pop dx
170 pop cx
171 pop ax
172 endif
173endm
174
175
176;; ASSUMES working stack.
177DO_shr macro reg, count
178 if VBOX_BIOS_CPU ge 80186
179 shr reg, count
180 else
181 if count ge 6
182 push cx
183 mov cl, count
184 shr reg, cl
185 pop cx
186 else
187 if count ge 5
188 shr reg, 1
189 endif
190 if count ge 4
191 shr reg, 1
192 endif
193 if count ge 3
194 shr reg, 1
195 endif
196 if count ge 2
197 shr reg, 1
198 endif
199 if count ge 1
200 shr reg, 1
201 endif
202 endif
203 endif
204endm
205
206
207;; ASSUMES working stack.
208DO_shl macro reg, count
209 if VBOX_BIOS_CPU ge 80186
210 shl reg, count
211 else
212 if count ge 6
213 push cx
214 mov cl, count
215 shl reg, cl
216 pop cx
217 else
218 if count ge 5
219 shl reg, 1
220 endif
221 if count ge 4
222 shl reg, 1
223 endif
224 if count ge 3
225 shl reg, 1
226 endif
227 if count ge 2
228 shl reg, 1
229 endif
230 if count ge 1
231 shl reg, 1
232 endif
233 endif
234 endif
235endm
236
237
238
239
240;; Adds a special label that will have its address checked after linking.
241BIOSORG_CHECK macro addr
242public biosorg_check_at_&addr
243biosorg_check_at_&addr:
244 endm
245
246;; Adds a special label that will have its address checked after linking.
247BIOSORG_CHECK_BEFORE macro addr
248public biosorg_check_before_or_at_&addr
249biosorg_check_before_or_at_&addr:
250 endm
251
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