bootsector2-cpu-a20-1.asm@ 97441

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1	; $Id: bootsector2-cpu-a20-1.asm 96407 2022-08-22 17:43:14Z vboxsync $
2	;; @file
3	; Bootsector that checks the A20 emulation.
4	;
5
6	;
7	; Copyright (C) 2007-2022 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	; The contents of this file may alternatively be used under the terms
26	; of the Common Development and Distribution License Version 1.0
27	; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	; in the VirtualBox distribution, in which case the provisions of the
29	; CDDL are applicable instead of those of the GPL.
30	;
31	; You may elect to license modified versions of this file under the
32	; terms and conditions of either the GPL or the CDDL or both.
33	;
34	; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	;
36
37
38	%include "iprt/asmdefs.mac"
39	%include "iprt/x86.mac"
40	%include "VBox/VMMDevTesting.mac"
41
42	;
43	; Include and execute the init code.
44	;
45	%define BS2_WITH_TRAPS
46	%define BS2_INIT_RM
47	%define BS2_INC_PE16
48	%define BS2_INC_PE32
49	%define BS2_INC_PP32
50	%define BS2_INC_PAE32
51	%define BS2_INC_LM64
52	%include "bootsector2-common-init-code.mac"
53
54
55	;
56	; The benchmark driver
57	;
58	BEGINPROC main
59	;
60	; Test prologue.
61	;
62	mov ax, .s_szTstName
63	call TestInit_r86
64
65	;
66	; The actual tests.
67	;
68	call TestA20_1 ; must come first
69	call TestA20_rm_rm
70	;call TestA20_rm_pe16
71	call TestA20_rm_pe32
72	call TestA20_rm_pp32
73	;call TestA20_rm_pp16
74	call TestA20_rm_pae32
75	call TestA20_rm_lm64
76
77	;
78	; We're done.
79	;
80	call TestTerm_r86
81	call Bs2Panic
82
83	.s_szTstName:
84	db 'tstA20-1', 0
85	.s_szInitialA20Status:
86	db 'Initial A20 state', 0
87	ENDPROC main
88
89
90	;
91	; Do some initial tests.
92	;
93	BEGINPROC TestA20_1
94	push eax
95	push edx
96	push ecx
97	push ebx
98	push edi
99
100	;
101	; Check that the A20 gate is disabled when we come from the BIOS.
102	;
103	mov ax, .s_szInitialA20Status
104	call TestSub_r86
105
106	call IsA20GateEnabled_rm
107	mov di, ax ; save A20 state in AX for bios test.
108	cmp al, 0
109	je .initial_state_done
110	mov ax, .s_szBadInitialA20Status
111	call TestFailed_r86
112	jmp .initial_state_done
113	.s_szInitialA20Status:
114	db 'Initial A20 state', 0
115	.s_szBadInitialA20Status:
116	db 'Initial A20 state is enabled, expected disabled', 10, 13, 0
117	.initial_state_done:
118	call TestSubDone_r86
119
120	;
121	; Disable it via the BIOS interface and check.
122	;
123	mov ax, .s_szBios
124	call TestSub_r86
125
126	; query support
127	mov ax, 2403h
128	int 15h
129	jnc .bios_2403_ok
130	movzx edx, ax
131	mov ax, .s_szBios2403Error
132	mov cl, VMMDEV_TESTING_UNIT_NONE
133	call TestValueU32_r86
134	jmp .bios_2403_done
135	.bios_2403_ok:
136	movzx edx, al
137	mov ax, .s_szBios2403Mask
138	mov cl, VMMDEV_TESTING_UNIT_NONE
139	call TestValueU32_r86
140	.bios_2403_done:
141
142	; Check what the bios thinks the state is.
143	call BiosIsA20GateEnabled_rm
144	cmp ax, di
145	je .bios_2402_done
146	push di
147	push ax
148	push word ds
149	push word .s_szBios2402Error
150	call TestFailedF_r86
151	add sp, 8
152	.bios_2402_done:
153
154	; Loop to make sure we get all transitions and ends up with A20 disabled.
155	mov cx, 10h
156	.bios_loop:
157	; enable it
158	mov ax, 2401h
159	push cx ; paranoia that seems necessary for at least one AMI bios.
160	int 15h
161	pop cx
162	jnc .bios_continue1
163	mov ax, .s_szBiosFailed2401
164	jmp .bios_failed
165	.bios_continue1:
166
167	call IsA20GateEnabled_rm
168	cmp al, 1
169	je .bios_continue2
170	mov ax, .s_szBiosEnableFailed
171	jmp .bios_failed
172	.bios_continue2:
173
174	; disable
175	mov ax, 2400h
176	push cx ; paranoia that seems necessary for at least one AMI bios.
177	int 15h
178	pop cx
179	jnc .bios_continue3
180	mov ax, .s_szBiosFailed2400
181	jmp .bios_failed
182	.bios_continue3:
183	call IsA20GateEnabled_rm
184	cmp al, 0
185	je .bios_continue4
186	mov ax, .s_szBiosDisableFailed
187	jmp .bios_failed
188	.bios_continue4:
189
190	loop .bios_loop
191	jmp .bios_done
192	.s_szBios:
193	db 'INT 15h AH=24 A20 Gate interface', 0
194	.s_szBios2403Mask:
195	db 'AX=2403 return (AL)', 0
196	.s_szBios2403Error:
197	db 'AX=2403 error (AX)', 10, 13, 0
198	.s_szBios2402Error:
199	db '2402h -> AX=%RX16 expected %RX16', 10, 13, 0
200	.s_szBiosFailed2400:
201	db '2400h interface failed', 10, 13, 0
202	.s_szBiosFailed2401:
203	db '2401h interface failed', 10, 13, 0
204	.s_szBiosDisableFailed:
205	db 'BIOS failed to disable A20 (or bad CPU)', 10, 13, 0
206	.s_szBiosEnableFailed:
207	db 'BIOS failed to enable A20', 10, 13, 0
208	.bios_failed:
209	call TestFailed_r86
210	.bios_done:
211	call TestSubDone_r86
212	call Bs2DisableA20ViaPortA_r86
213	call Bs2DisableA20ViaKbd_r86
214
215	;
216	; Test the fast A20 gate interface.
217	;
218	mov ax, .s_szFastA20
219	call TestSub_r86
220
221	mov cx, 10h
222	.fast_loop:
223	call Bs2EnableA20ViaPortA_r86
224	call IsA20GateEnabled_rm
225	cmp al, 1
226	mov ax, .s_szFastEnableFailed
227	jne .fast_failed
228
229	call Bs2DisableA20ViaPortA_r86
230	call IsA20GateEnabled_rm
231	cmp al, 0
232	mov ax, .s_szFastDisableFailed
233	jne .fast_failed
234	loop .fast_loop
235
236	jmp .fast_done
237	.s_szFastA20:
238	db 'Fast A20 Gate Interface', 0
239	.s_szFastDisableFailed:
240	db 'Fast A20 gate disabling failed', 10, 13, 0
241	.s_szFastEnableFailed:
242	db 'Fast A20 gate enabling failed', 10, 13, 0
243	.fast_failed:
244	call TestFailed_r86
245	.fast_done:
246	call TestSubDone_r86
247	call Bs2DisableA20ViaPortA_r86
248	call Bs2DisableA20ViaKbd_r86
249
250	;
251	; Test the keyboard interface.
252	;
253	mov ax, .s_szKeyboardA20
254	call TestSub_r86
255
256	mov cx, 10h
257	.kbd_loop:
258	call Bs2EnableA20ViaKbd_r86
259	call IsA20GateEnabled_rm
260	cmp al, 1
261	mov ax, .s_szKbdEnableFailed
262	jne .kbd_failed
263
264	call Bs2DisableA20ViaKbd_r86
265	call IsA20GateEnabled_rm
266	cmp al, 0
267	mov ax, .s_szKbdDisableFailed
268	jne .kbd_failed
269	loop .kbd_loop
270
271	jmp .kbd_done
272	.s_szKeyboardA20:
273	db 'Keyboard A20 Gate Interface', 0
274	.s_szKbdDisableFailed:
275	db 'Disabling the A20 gate via the keyboard controller failed', 10, 13, 0
276	.s_szKbdEnableFailed:
277	db 'Enabling the A20 gate via the keyboard controller failed', 10, 13, 0
278	.kbd_failed:
279	call TestFailed_r86
280	.kbd_done:
281	call TestSubDone_r86
282	call Bs2DisableA20ViaPortA_r86
283	call Bs2DisableA20ViaKbd_r86
284
285	pop edi
286	pop ebx
287	pop ecx
288	pop edx
289	pop eax
290	ret
291	ENDPROC TestA20_1
292
293
294	;;
295	; Checks if the A20 gate is enabled.
296	;
297	; This is do by temporarily changing a word at address 0000000h and see if this
298	; is reflected at address 0100000h (1 MB). The word written is
299	; ~(word )0x100000h to make sure it won't accidentally match.
300	;
301	; @returns ax 1 if enabled, 0 if disabled.
302	;
303	BEGINPROC IsA20GateEnabled_rm
304	push ds
305	push es
306	push dx
307	pushf
308	cli
309
310	.once_again:
311	xor ax, ax
312	mov ds, ax
313	dec ax
314	mov es, ax
315
316	mov ax, [es:0010h] ; 0ffff:0010 => 0100000h (1 MB)
317	mov dx, [ds:0000h] ; 00000:0000 => 0000000h - save it
318	not ax
319	mov [ds:0000h], ax ; 0000000h - write ~[0100000h]
320	cmp [es:0010h], ax ; 0100000h - same as 0000000h if A20 is disabled.
321	mov [ds:0000h], dx ; 0000000h - restore original value
322	setne al
323	movzx ax, al
324
325	popf
326	pop dx
327	pop es
328	pop ds
329	ret
330	ENDPROC IsA20GateEnabled_rm
331
332	;;
333	; Checks if the BIOS thinks the A20 gate is enabled.
334	;
335	; @returns ax 1 if enabled, 0 if disabled.
336	;
337	BEGINPROC BiosIsA20GateEnabled_rm
338	push ecx
339	push eax
340
341	mov ax, 2402h
342	int 15h
343	jnc .ok
344	mov al, 080h
345	.ok:
346	mov cx, ax
347	pop eax
348	mov ax, cx
349	pop ecx
350	ret
351	ENDPROC BiosIsA20GateEnabled_rm
352
353	;
354	; Instantiate the template code.
355	;
356	%include "bootsector2-template-footer.mac" ; reset the initial environemnt.
357
358	%define TMPL_RM
359	%include "bootsector2-cpu-a20-1-template.mac"
360	;%define TMPL_CMN_V86
361	;%include "bootsector2-cpu-a20-1-template.mac"
362	%define TMPL_PE16
363	%include "bootsector2-cpu-a20-1-template.mac"
364	%define TMPL_PE32
365	%include "bootsector2-cpu-a20-1-template.mac"
366	;%define TMPL_PP16
367	;%include "bootsector2-cpu-a20-1-template.mac"
368	%define TMPL_PP32
369	%include "bootsector2-cpu-a20-1-template.mac"
370	;%define TMPL_PAE16
371	;%include "bootsector2-cpu-a20-1-template.mac"
372	%define TMPL_PAE32
373	%include "bootsector2-cpu-a20-1-template.mac"
374	;%define TMPL_LM16
375	;%include "bootsector2-cpu-a20-1-template.mac"
376	;%define TMPL_LM32
377	;%include "bootsector2-cpu-a20-1-template.mac"
378	%define TMPL_LM64
379	%include "bootsector2-cpu-a20-1-template.mac"
380
381
382	;
383	; End sections and image.
384	;
385	%include "bootsector2-common-end.mac"
386

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source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bootsector2-cpu-a20-1.asm@ 97441

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