bootsector2-vbinstst-kernel.asm@ 98102

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1	; $Id: bootsector2-vbinstst-kernel.asm 96407 2022-08-22 17:43:14Z vboxsync $
2	;; @file
3	; bootsector #2 kernel for big instruction testcases.
4	; VBoxManage setextradata bs-vbinstst-64-1 VBoxInternal/Devices/VMMDev/0/Config/TestingEnabled 1
5	;
6
7	;
8	; Copyright (C) 2007-2022 Oracle and/or its affiliates.
9	;
10	; This file is part of VirtualBox base platform packages, as
11	; available from https://www.virtualbox.org.
12	;
13	; This program is free software; you can redistribute it and/or
14	; modify it under the terms of the GNU General Public License
15	; as published by the Free Software Foundation, in version 3 of the
16	; License.
17	;
18	; This program is distributed in the hope that it will be useful, but
19	; WITHOUT ANY WARRANTY; without even the implied warranty of
20	; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21	; General Public License for more details.
22	;
23	; You should have received a copy of the GNU General Public License
24	; along with this program; if not, see <https://www.gnu.org/licenses>.
25	;
26	; The contents of this file may alternatively be used under the terms
27	; of the Common Development and Distribution License Version 1.0
28	; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
29	; in the VirtualBox distribution, in which case the provisions of the
30	; CDDL are applicable instead of those of the GPL.
31	;
32	; You may elect to license modified versions of this file under the
33	; terms and conditions of either the GPL or the CDDL or both.
34	;
35	; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
36	;
37
38
39	;
40	; This is always the first include file.
41	;
42	%include "bootsector2-first.mac"
43
44	;
45	; Include and execute the init code.
46	;
47	%define BS2_INIT_RM
48	%define BS2_WITH_TRAPS
49	%define BS2_WITHOUT_RAW_MODE ; causes troubles with PIC/floppy.
50
51	%define BS2_INC_RM
52	%define BS2_INC_PE16
53	%define BS2_INC_PE32
54	%define BS2_INC_PP16
55	%define BS2_INC_PP32
56	%define BS2_INC_PAE16
57	%define BS2_INC_PAE32
58	%define BS2_INC_LM16
59	%define BS2_INC_LM32
60	%define BS2_INC_LM64
61	%include "bootsector2-common-init-code.mac"
62	%include "bootsector2-api.mac"
63	%include "iprt/formats/pe.mac"
64	%include "iprt/formats/mz.mac"
65
66
67	BEGINCODE
68	BEGINPROC main
69	;
70	; Set up the runtime environment.
71	;
72	call Bs2EnableA20_r86
73
74	; 16-bit real mode.
75	%undef BS2_API_TEMPLATE_ACTION
76	%define BS2_API_TEMPLATE_ACTION(a_Name) mov dword [NAME(g_pfn %+ a_Name %+ _r86)], dword NAME(a_Name %+ _r86)
77	BS2_API_TEMPLATE
78
79	; 16-bit protected mode.
80	%undef BS2_API_TEMPLATE_ACTION
81	%define BS2_API_TEMPLATE_ACTION(a_Name) mov word [NAME(g_pfn %+ a_Name %+ _p16)], word NAME(a_Name %+ _p16)
82	BS2_API_TEMPLATE
83	mov eax, BS2_SEL_CS16
84	%undef BS2_API_TEMPLATE_ACTION
85	%define BS2_API_TEMPLATE_ACTION(a_Name) mov [NAME(g_pfn %+ a_Name %+ _p16) + 2], ax
86	BS2_API_TEMPLATE
87
88	; 32-bit
89	%undef BS2_API_TEMPLATE_ACTION
90	%define BS2_API_TEMPLATE_ACTION(a_Name) mov dword [NAME(g_pfn %+ a_Name %+ _p32)], dword NAME(a_Name %+ _p32)
91	BS2_API_TEMPLATE
92
93	; 64-bit
94	%undef BS2_API_TEMPLATE_ACTION
95	%define BS2_API_TEMPLATE_ACTION(a_Name) mov dword [NAME(g_pfn %+ a_Name %+ _p64)], dword NAME(a_Name %+ _p64)
96	BS2_API_TEMPLATE
97	xor eax, eax
98	%undef BS2_API_TEMPLATE_ACTION
99	%define BS2_API_TEMPLATE_ACTION(a_Name) mov dword [NAME(g_pfn %+ a_Name %+ _p64) + 4], eax
100	BS2_API_TEMPLATE
101
102	; The magic markers and version number.
103	mov dword [g_u32Bs2ApiMagic], BS2_API_MAGIC
104	mov dword [g_u32Bs2ApiEndMagic], BS2_API_MAGIC
105	mov dword [g_u32Bs2ApiVersion], BS2_API_VERSION
106
107	;
108	; Load the extended image into high memory.
109	;
110	mov dl, [g_bBootDrv]
111	call NAME(bs2LoadBigImage)
112
113	;
114	; Hand control over to the extended image.
115	;
116	%ifdef BS2_BIG_IMAGE_LM64
117	call Bs2EnterMode_rm_lm64
118	BITS 64
119	mov eax, BS2_BIG_LOAD_ADDR
120	call rax
121	call Bs2ExitMode_lm64
122	BITS 16
123
124	%elifdef BS2_BIG_IMAGE_PP32
125	call Bs2EnterMode_rm_pp32
126	BITS 32
127	mov eax, BS2_BIG_LOAD_ADDR
128	call eax
129	call Bs2ExitMode_pp32
130	BITS 16
131
132	%elifdef BS2_BIG_IMAGE_PAE32
133	call Bs2EnterMode_rm_pae32
134	BITS 32
135	mov eax, BS2_BIG_LOAD_ADDR
136	call eax
137	call Bs2ExitMode_pae32
138	BITS 16
139
140	%else
141	;
142	; Probe the image, looking for an executable format we can deal with.
143	; Not doing a lot of checking here, but who cares right now...
144	;
145	call Bs2EnterMode_rm_pp32
146	BITS 32
147	mov eax, BS2_BIG_LOAD_ADDR
148	cmp word [eax], IMAGE_DOS_SIGNATURE
149	jne .not_dos
150	add eax, [eax + IMAGE_DOS_HEADER.e_lfanew]
151	.not_dos:
152	cmp dword [eax], IMAGE_NT_SIGNATURE
153	je .is_pe
154	mov eax, BS2_BIG_LOAD_ADDR
155	jmp .start_32
156
157	.is_pe:
158	lea edx, [eax + IMAGE_NT_HEADERS32.FileHeader]
159	cmp word [edx + IMAGE_FILE_HEADER.Machine], IMAGE_FILE_MACHINE_I386
160	je .is_pe32
161	cmp word [edx + IMAGE_FILE_HEADER.Machine], IMAGE_FILE_MACHINE_AMD64
162	je .is_pe64
163	jmp .panic_32
164
165	.is_pe32:
166	add edx, IMAGE_FILE_HEADER_size
167	mov eax, [edx + IMAGE_OPTIONAL_HEADER32.AddressOfEntryPoint]
168	add eax, BS2_BIG_LOAD_ADDR
169	jmp .start_32
170
171	.is_pe64:
172	add edx, IMAGE_FILE_HEADER_size
173	mov eax, [edx + IMAGE_OPTIONAL_HEADER64.AddressOfEntryPoint]
174	add eax, BS2_BIG_LOAD_ADDR
175	jmp .start_64
176
177	; Start executing at eax in 32-bit mode (current).
178	.start_32:
179	call eax
180	.panic_32:
181	call Bs2ExitMode_pp32
182	BITS 16
183	jmp .panic
184
185	; Start executing at eax in 64-bit mode.
186	BITS 32
187	.start_64:
188	call Bs2ExitMode_pp32
189	BITS 16
190	call Bs2EnterMode_rm_lm64
191	BITS 64
192	mov eax, eax
193	call rax
194	call Bs2ExitMode_lm64
195	BITS 16
196	jmp .panic
197
198	.panic:
199	%endif
200	call Bs2Panic
201	ENDPROC main
202
203
204
205
206	;;
207	; Loads the big image off the floppy.
208	;
209	; This uses the the_end label to figure out the starting offset.
210	; The length is assumed to be the whole floppy.
211	;
212	; Clobbers nothing, except for 68KB of memory beyond the_end.
213	;
214	; @param dl The boot drive number (from BIOS).
215	;
216	BITS 16
217	BEGINPROC bs2LoadBigImage
218	push ebp
219	movzx ebp, sp
220
221	%define bSavedDiskNo byte [bp - 02h]
222	push dx
223	%define bMaxSector byte [bp - 04h]
224	push 0
225	%define bMaxHead byte [bp - 06h]
226	push 0
227	%define bMaxCylinder byte [bp - 08h]
228	push 0
229	%define pbHighDst dword [bp - 0ch]
230	push dword BS2_BIG_LOAD_ADDR
231	%define SegTemp word [bp - 0eh]
232	push 0
233	%define fStatus byte [bp - 10h]
234	push 0
235
236	push es
237	push ds
238	push eax
239	push edx
240	push ecx
241	push ebx
242	push edi
243	push esi
244	push ebp
245
246	; Display message.
247	push cs
248	push .s_szLoadingBigImage
249	call PrintF_r86
250	add sp, 4
251
252
253	;
254	; Try figure the geometry. This defines how much we'll read.
255	;
256	mov ah, 08h
257	xor di, di ; (es:di = 0000:0000 works around some buggy bioses, says wikipedia.)
258	mov es, di
259	int 13h
260	jc .param_error
261	mov bMaxSector, cl ; Do the cl[7:6]+ch stuff so we can address 255 sectors on the fake 63MB floppy.
262	mov bMaxHead, dh
263	mov bMaxCylinder, ch ; See above.
264	mov dl, bSavedDiskNo
265	%if 0
266	movzx ax, bMaxCylinder
267	push ax
268	movzx cx, bMaxHead
269	push cx
270	movzx ax, bMaxSector
271	push ax
272	push ds
273	push .s_szDbgParam
274	call PrintF_r86
275	jmp .dprintf_param_done
276	.s_szDbgParam:
277	db 13, 10, 'Floppy params max: sectors=%RX16 heads=%RX16 cylinders=%RX16', 13, 10, 0
278	.dprintf_param_done:
279	%endif
280
281	;
282	; Skip the kernel image (this could be done more efficiently, but this
283	; also does the trick).
284	;
285	lea eax, [dword the_end]
286	sub eax, start
287	shr eax, 9 ; sectors to skip
288	mov cx, 0001h ; sector (1-based), cylinder (0-based).
289	xor dh, dh ; head (0-based).
290	.skip_one_more:
291	inc cl
292	cmp cl, bMaxSector
293	jbe .decrement_sector_count
294
295	mov cl, 1
296	inc dh
297	cmp dh, bMaxHead ; ASSUMES bMaxHead < 255.
298	jbe .decrement_sector_count
299
300	mov dh, 0
301	inc ch
302
303	.decrement_sector_count:
304	dec ax
305	jnz .skip_one_more
306
307
308
309	;
310	; Load loop. We load and copy 64 KB at the time into the high location.
311	; Fixed registers (above): dl=drive, cl[7:6]:ch=cylinder, dh=head, cl[5:0]=sector.
312	;
313	lea eax, [dword the_end + 0ffffh]
314	and eax, 0ffff0000h
315	shr eax, 4
316	mov SegTemp, ax ; the 64KB segment we use for temporary storage.
317
318	.the_load_loop:
319	mov al, '.'
320	call PrintChr_r86
321
322	; Fill the segment with int3s (in case we don't read a full 64KB).
323	mov eax, 0cccccccch
324	mov di, SegTemp
325	mov es, di
326	xor edi, edi
327	push ecx
328	cld
329	mov cx, 4000h
330	rep stosd
331	pop ecx
332
333	;
334	; Load a bunch of sectors into the temp segment.
335	;
336	xor ebx, ebx
337	.the_sector_load_loop:
338	; Figure how many sectors we can read without switching track or side.
339	movzx ax, bMaxSector
340	sub al, cl
341	inc al ; al = sectors left to read in the current track on the current side.
342	mov di, bx
343	shr di, 9 ; bx/512 = current sector offset.
344	neg di
345	add di, 10000h / 512 ; di = sectors left to read in the 64KB buffer.
346	cmp ax, di ; ax = min(ax, di)
347	jbe .use_ax_sector_count1
348	mov ax, di
349	.use_ax_sector_count1:
350	cmp ax, 64 ; ax = min(ax,64) - Our BIOS limitation is 72, play safe.
351	jbe .use_ax_sector_count2
352	mov ax, 64
353	.use_ax_sector_count2:
354	mov di, ax ; save the number of sectors we read
355
356	; Do the reading.
357	%if 0
358	push bx
359	push ax
360	push dx
361	push cx
362	push cs
363	push .s_szDbgRead
364	call PrintF_r86
365	jmp .after_read_dprintf
366	.s_szDbgRead: db 'Reading CX=%RX16 DX=%RX16 AX=%RX16 BX=%RX16', 13, 10, 0
367	.after_read_dprintf:
368	%endif
369	push bx
370	mov ah, 02h ; ah=read function
371	int 13h
372	pop bx
373	jc .read_error
374
375	; advance to the next sector/head/cylinder and address (lazy impl).
376	.advance_another_sector:
377	cmp cl, bMaxSector
378	je .next_head
379	inc cl
380	jmp .adv_addr
381
382	.next_head:
383	mov cl, 1
384	cmp dh, bMaxHead
385	je .next_cylinder
386	inc dh
387	jmp .adv_addr
388
389	.next_cylinder:
390	mov dh, 0
391	cmp ch, bMaxCylinder ; No the cl[7:6]+ch stuff so we can address 255 sectors on the fake 63MB floppy.
392	jb .update_ch
393	mov fStatus, 1
394	jmp .move_block
395	.update_ch:
396	inc ch
397
398	.adv_addr:
399	add bx, 512
400	dec di
401	jnz .advance_another_sector
402
403	test bx, bx
404	jnz .the_sector_load_loop
405
406	.move_block:
407	;
408	; Copy the memory into high mem.
409	;
410	%if 0
411	mov edi, pbHighDst
412	push edi
413	push cs
414	push .s_szDbgMove
415	call PrintF_r86
416	jmp .after_move_dprintf
417	.s_szDbgMove: db 'Moving memory to EDI=%RX32', 13, 10, 0
418	.after_move_dprintf:
419	%endif
420
421	push ecx
422	push edx
423	push ds
424	push es
425	call Bs2EnterMode_rm_pp32
426	BITS 32
427	; Copy
428	mov edi, pbHighDst
429	movzx esi, SegTemp
430	shl esi, 4
431	mov ecx, 10000h / 4
432	cld
433	rep movsd
434
435	; Verify
436	mov edi, pbHighDst
437	movzx esi, SegTemp
438	shl esi, 4
439	mov ecx, 10000h / 4
440	cld
441	repe cmpsd
442	je .mem_verified_ok
443	mov fStatus, 2
444
445	.mem_verified_ok:
446	mov pbHighDst, edi
447
448	call Bs2ExitMode_pp32
449	BITS 16
450	pop es
451	pop ds
452	pop edx
453	pop ecx
454
455	; Continue reading and copying?
456	cmp fStatus, 0
457	je .the_load_loop
458
459	; Do we quit the loop on a failure?
460	cmp fStatus, 2
461	je .verify_failed_msg
462
463	;
464	; Done, so end the current message line.
465	;
466	mov al, 13
467	call PrintChr_r86
468	mov al, 10
469	call PrintChr_r86
470
471
472	pop esi
473	pop edi
474	pop ebx
475	pop ecx
476	pop edx
477	pop eax
478	pop ds
479	pop es
480	mov sp, bp
481	pop ebp
482	ret
483
484
485	;
486	; Something went wrong, display a message.
487	;
488	.verify_failed_msg:
489	mov edi, pbHighDst
490	push edi
491	push cs
492	push .s_szVerifyFailed
493	jmp .print_message_and_panic
494
495	.param_error:
496	push ax
497	push cs
498	push .s_szParamError
499	jmp .print_message_and_panic
500
501	.read_error:
502	push ax
503	push cs
504	push .s_szReadError
505	jmp .print_message_and_panic
506
507	.print_message_and_panic:
508	call PrintF_r86
509	call Bs2Panic
510	jmp .print_message_and_panic
511
512	.s_szReadError:
513	db 13, 10, 'Error reading: %RX8', 13, 10, 0
514	.s_szParamError:
515	db 13, 10, 'Error getting params: %RX8', 13, 10, 0
516	.s_szVerifyFailed:
517	db 13, 10, 'Failed to move block high... (%RX32) Got enough memory configured?', 13, 10, 0
518	.s_szLoadingBigImage:
519	db 'Loading 2nd image.', 0
520	ENDPROC bs2LoadBigImage
521
522
523	;
524	; End sections and image.
525	;
526	%include "bootsector2-common-end.mac"
527

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source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bootsector2-vbinstst-kernel.asm@ 98102

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