bootsector2-cpu-a20-1.asm@ 93115

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1	; $Id: bootsector2-cpu-a20-1.asm 93115 2022-01-01 11:31:46Z vboxsync $
2	;; @file
3	; Bootsector that checks the A20 emulation.
4	;
5
6	;
7	; Copyright (C) 2007-2022 Oracle Corporation
8	;
9	; This file is part of VirtualBox Open Source Edition (OSE), as
10	; available from http://www.virtualbox.org. This file is free software;
11	; you can redistribute it and/or modify it under the terms of the GNU
12	; General Public License (GPL) as published by the Free Software
13	; Foundation, in version 2 as it comes in the "COPYING" file of the
14	; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	;
17	; The contents of this file may alternatively be used under the terms
18	; of the Common Development and Distribution License Version 1.0
19	; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	; VirtualBox OSE distribution, in which case the provisions of the
21	; CDDL are applicable instead of those of the GPL.
22	;
23	; You may elect to license modified versions of this file under the
24	; terms and conditions of either the GPL or the CDDL or both.
25	;
26
27
28	%include "iprt/asmdefs.mac"
29	%include "iprt/x86.mac"
30	%include "VBox/VMMDevTesting.mac"
31
32	;
33	; Include and execute the init code.
34	;
35	%define BS2_WITH_TRAPS
36	%define BS2_INIT_RM
37	%define BS2_INC_PE16
38	%define BS2_INC_PE32
39	%define BS2_INC_PP32
40	%define BS2_INC_PAE32
41	%define BS2_INC_LM64
42	%include "bootsector2-common-init-code.mac"
43
44
45	;
46	; The benchmark driver
47	;
48	BEGINPROC main
49	;
50	; Test prologue.
51	;
52	mov ax, .s_szTstName
53	call TestInit_r86
54
55	;
56	; The actual tests.
57	;
58	call TestA20_1 ; must come first
59	call TestA20_rm_rm
60	;call TestA20_rm_pe16
61	call TestA20_rm_pe32
62	call TestA20_rm_pp32
63	;call TestA20_rm_pp16
64	call TestA20_rm_pae32
65	call TestA20_rm_lm64
66
67	;
68	; We're done.
69	;
70	call TestTerm_r86
71	call Bs2Panic
72
73	.s_szTstName:
74	db 'tstA20-1', 0
75	.s_szInitialA20Status:
76	db 'Initial A20 state', 0
77	ENDPROC main
78
79
80	;
81	; Do some initial tests.
82	;
83	BEGINPROC TestA20_1
84	push eax
85	push edx
86	push ecx
87	push ebx
88	push edi
89
90	;
91	; Check that the A20 gate is disabled when we come from the BIOS.
92	;
93	mov ax, .s_szInitialA20Status
94	call TestSub_r86
95
96	call IsA20GateEnabled_rm
97	mov di, ax ; save A20 state in AX for bios test.
98	cmp al, 0
99	je .initial_state_done
100	mov ax, .s_szBadInitialA20Status
101	call TestFailed_r86
102	jmp .initial_state_done
103	.s_szInitialA20Status:
104	db 'Initial A20 state', 0
105	.s_szBadInitialA20Status:
106	db 'Initial A20 state is enabled, expected disabled', 10, 13, 0
107	.initial_state_done:
108	call TestSubDone_r86
109
110	;
111	; Disable it via the BIOS interface and check.
112	;
113	mov ax, .s_szBios
114	call TestSub_r86
115
116	; query support
117	mov ax, 2403h
118	int 15h
119	jnc .bios_2403_ok
120	movzx edx, ax
121	mov ax, .s_szBios2403Error
122	mov cl, VMMDEV_TESTING_UNIT_NONE
123	call TestValueU32_r86
124	jmp .bios_2403_done
125	.bios_2403_ok:
126	movzx edx, al
127	mov ax, .s_szBios2403Mask
128	mov cl, VMMDEV_TESTING_UNIT_NONE
129	call TestValueU32_r86
130	.bios_2403_done:
131
132	; Check what the bios thinks the state is.
133	call BiosIsA20GateEnabled_rm
134	cmp ax, di
135	je .bios_2402_done
136	push di
137	push ax
138	push word ds
139	push word .s_szBios2402Error
140	call TestFailedF_r86
141	add sp, 8
142	.bios_2402_done:
143
144	; Loop to make sure we get all transitions and ends up with A20 disabled.
145	mov cx, 10h
146	.bios_loop:
147	; enable it
148	mov ax, 2401h
149	push cx ; paranoia that seems necessary for at least one AMI bios.
150	int 15h
151	pop cx
152	jnc .bios_continue1
153	mov ax, .s_szBiosFailed2401
154	jmp .bios_failed
155	.bios_continue1:
156
157	call IsA20GateEnabled_rm
158	cmp al, 1
159	je .bios_continue2
160	mov ax, .s_szBiosEnableFailed
161	jmp .bios_failed
162	.bios_continue2:
163
164	; disable
165	mov ax, 2400h
166	push cx ; paranoia that seems necessary for at least one AMI bios.
167	int 15h
168	pop cx
169	jnc .bios_continue3
170	mov ax, .s_szBiosFailed2400
171	jmp .bios_failed
172	.bios_continue3:
173	call IsA20GateEnabled_rm
174	cmp al, 0
175	je .bios_continue4
176	mov ax, .s_szBiosDisableFailed
177	jmp .bios_failed
178	.bios_continue4:
179
180	loop .bios_loop
181	jmp .bios_done
182	.s_szBios:
183	db 'INT 15h AH=24 A20 Gate interface', 0
184	.s_szBios2403Mask:
185	db 'AX=2403 return (AL)', 0
186	.s_szBios2403Error:
187	db 'AX=2403 error (AX)', 10, 13, 0
188	.s_szBios2402Error:
189	db '2402h -> AX=%RX16 expected %RX16', 10, 13, 0
190	.s_szBiosFailed2400:
191	db '2400h interface failed', 10, 13, 0
192	.s_szBiosFailed2401:
193	db '2401h interface failed', 10, 13, 0
194	.s_szBiosDisableFailed:
195	db 'BIOS failed to disable A20 (or bad CPU)', 10, 13, 0
196	.s_szBiosEnableFailed:
197	db 'BIOS failed to enable A20', 10, 13, 0
198	.bios_failed:
199	call TestFailed_r86
200	.bios_done:
201	call TestSubDone_r86
202	call Bs2DisableA20ViaPortA_r86
203	call Bs2DisableA20ViaKbd_r86
204
205	;
206	; Test the fast A20 gate interface.
207	;
208	mov ax, .s_szFastA20
209	call TestSub_r86
210
211	mov cx, 10h
212	.fast_loop:
213	call Bs2EnableA20ViaPortA_r86
214	call IsA20GateEnabled_rm
215	cmp al, 1
216	mov ax, .s_szFastEnableFailed
217	jne .fast_failed
218
219	call Bs2DisableA20ViaPortA_r86
220	call IsA20GateEnabled_rm
221	cmp al, 0
222	mov ax, .s_szFastDisableFailed
223	jne .fast_failed
224	loop .fast_loop
225
226	jmp .fast_done
227	.s_szFastA20:
228	db 'Fast A20 Gate Interface', 0
229	.s_szFastDisableFailed:
230	db 'Fast A20 gate disabling failed', 10, 13, 0
231	.s_szFastEnableFailed:
232	db 'Fast A20 gate enabling failed', 10, 13, 0
233	.fast_failed:
234	call TestFailed_r86
235	.fast_done:
236	call TestSubDone_r86
237	call Bs2DisableA20ViaPortA_r86
238	call Bs2DisableA20ViaKbd_r86
239
240	;
241	; Test the keyboard interface.
242	;
243	mov ax, .s_szKeyboardA20
244	call TestSub_r86
245
246	mov cx, 10h
247	.kbd_loop:
248	call Bs2EnableA20ViaKbd_r86
249	call IsA20GateEnabled_rm
250	cmp al, 1
251	mov ax, .s_szKbdEnableFailed
252	jne .kbd_failed
253
254	call Bs2DisableA20ViaKbd_r86
255	call IsA20GateEnabled_rm
256	cmp al, 0
257	mov ax, .s_szKbdDisableFailed
258	jne .kbd_failed
259	loop .kbd_loop
260
261	jmp .kbd_done
262	.s_szKeyboardA20:
263	db 'Keyboard A20 Gate Interface', 0
264	.s_szKbdDisableFailed:
265	db 'Disabling the A20 gate via the keyboard controller failed', 10, 13, 0
266	.s_szKbdEnableFailed:
267	db 'Enabling the A20 gate via the keyboard controller failed', 10, 13, 0
268	.kbd_failed:
269	call TestFailed_r86
270	.kbd_done:
271	call TestSubDone_r86
272	call Bs2DisableA20ViaPortA_r86
273	call Bs2DisableA20ViaKbd_r86
274
275	pop edi
276	pop ebx
277	pop ecx
278	pop edx
279	pop eax
280	ret
281	ENDPROC TestA20_1
282
283
284	;;
285	; Checks if the A20 gate is enabled.
286	;
287	; This is do by temporarily changing a word at address 0000000h and see if this
288	; is reflected at address 0100000h (1 MB). The word written is
289	; ~(word )0x100000h to make sure it won't accidentally match.
290	;
291	; @returns ax 1 if enabled, 0 if disabled.
292	;
293	BEGINPROC IsA20GateEnabled_rm
294	push ds
295	push es
296	push dx
297	pushf
298	cli
299
300	.once_again:
301	xor ax, ax
302	mov ds, ax
303	dec ax
304	mov es, ax
305
306	mov ax, [es:0010h] ; 0ffff:0010 => 0100000h (1 MB)
307	mov dx, [ds:0000h] ; 00000:0000 => 0000000h - save it
308	not ax
309	mov [ds:0000h], ax ; 0000000h - write ~[0100000h]
310	cmp [es:0010h], ax ; 0100000h - same as 0000000h if A20 is disabled.
311	mov [ds:0000h], dx ; 0000000h - restore original value
312	setne al
313	movzx ax, al
314
315	popf
316	pop dx
317	pop es
318	pop ds
319	ret
320	ENDPROC IsA20GateEnabled_rm
321
322	;;
323	; Checks if the BIOS thinks the A20 gate is enabled.
324	;
325	; @returns ax 1 if enabled, 0 if disabled.
326	;
327	BEGINPROC BiosIsA20GateEnabled_rm
328	push ecx
329	push eax
330
331	mov ax, 2402h
332	int 15h
333	jnc .ok
334	mov al, 080h
335	.ok:
336	mov cx, ax
337	pop eax
338	mov ax, cx
339	pop ecx
340	ret
341	ENDPROC BiosIsA20GateEnabled_rm
342
343	;
344	; Instantiate the template code.
345	;
346	%include "bootsector2-template-footer.mac" ; reset the initial environemnt.
347
348	%define TMPL_RM
349	%include "bootsector2-cpu-a20-1-template.mac"
350	;%define TMPL_CMN_V86
351	;%include "bootsector2-cpu-a20-1-template.mac"
352	%define TMPL_PE16
353	%include "bootsector2-cpu-a20-1-template.mac"
354	%define TMPL_PE32
355	%include "bootsector2-cpu-a20-1-template.mac"
356	;%define TMPL_PP16
357	;%include "bootsector2-cpu-a20-1-template.mac"
358	%define TMPL_PP32
359	%include "bootsector2-cpu-a20-1-template.mac"
360	;%define TMPL_PAE16
361	;%include "bootsector2-cpu-a20-1-template.mac"
362	%define TMPL_PAE32
363	%include "bootsector2-cpu-a20-1-template.mac"
364	;%define TMPL_LM16
365	;%include "bootsector2-cpu-a20-1-template.mac"
366	;%define TMPL_LM32
367	;%include "bootsector2-cpu-a20-1-template.mac"
368	%define TMPL_LM64
369	%include "bootsector2-cpu-a20-1-template.mac"
370
371
372	;
373	; End sections and image.
374	;
375	%include "bootsector2-common-end.mac"
376

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source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bootsector2-cpu-a20-1.asm@ 93115

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