VBoxGuestA-os2.asm@ 78376

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1	; $Id: VBoxGuestA-os2.asm 76553 2019-01-01 01:45:53Z vboxsync $
2	;; @file
3	; VBoxGuest - OS/2 assembly file, the first file in the link.
4	;
5
6	;
7	; Copyright (C) 2007-2019 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	; This code is based on:
27	;
28	; VBoxDrv - OS/2 assembly file, the first file in the link.
29	;
30	; Copyright (c) 2007-2010 knut st. osmundsen <[email protected]>
31	;
32	; Permission is hereby granted, free of charge, to any person
33	; obtaining a copy of this software and associated documentation
34	; files (the "Software"), to deal in the Software without
35	; restriction, including without limitation the rights to use,
36	; copy, modify, merge, publish, distribute, sublicense, and/or sell
37	; copies of the Software, and to permit persons to whom the
38	; Software is furnished to do so, subject to the following
39	; conditions:
40	;
41	; The above copyright notice and this permission notice shall be
42	; included in all copies or substantial portions of the Software.
43	;
44	; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
45	; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
46	; OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
47	; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
48	; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
49	; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
50	; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
51	; OTHER DEALINGS IN THE SOFTWARE.
52	;
53
54
55	;*******************************************************************************
56	;* Header Files *
57	;*******************************************************************************
58	%define RT_INCL_16BIT_SEGMENTS
59	%include "iprt/asmdefs.mac"
60	%include "iprt/err.mac"
61	%include "VBox/VBoxGuest.mac"
62
63
64	;*******************************************************************************
65	;* Structures and Typedefs *
66	;*******************************************************************************
67	;;
68	; Request packet header.
69	struc PKTHDR
70	.cb resb 1
71	.unit resb 1
72	.cmd resb 1
73	.status resw 1
74	.res1 resd 1
75	.link resd 1
76	endstruc
77
78
79	;;
80	; Init request packet - input.
81	struc PKTINITIN
82	.cb resb 1
83	.unit resb 1
84	.cmd resb 1
85	.status resw 1
86	.res1 resd 1
87	.link resd 1
88
89	.data_1 resb 1
90	.fpfnDevHlp resd 1
91	.fpszArgs resd 1
92	.data_2 resb 1
93	endstruc
94
95	;;
96	; Init request packet - output.
97	struc PKTINITOUT
98	.cb resb 1
99	.unit resb 1
100	.cmd resb 1
101	.status resw 1
102	.res1 resd 1
103	.link resd 1
104
105	.cUnits resb 1 ; block devs only.
106	.cbCode16 resw 1
107	.cbData16 resw 1
108	.fpaBPBs resd 1 ; block devs only.
109	.data_2 resb 1
110	endstruc
111
112	;;
113	; Open request packet.
114	struc PKTOPEN
115	.cb resb 1
116	.unit resb 1
117	.cmd resb 1
118	.status resw 1
119	.res1 resd 1
120	.link resd 1
121	.sfn resw 1
122	endstruc
123
124	;;
125	; Close request packet.
126	struc PKTCLOSE
127	.cb resb 1
128	.unit resb 1
129	.cmd resb 1
130	.status resw 1
131	.res1 resd 1
132	.link resd 1
133	.sfn resw 1
134	endstruc
135
136	;;
137	; IOCtl request packet.
138	struc PKTIOCTL
139	.cb resb 1
140	.unit resb 1
141	.cmd resb 1
142	.status resw 1
143	.res1 resd 1
144	.link resd 1
145
146	.cat resb 1
147	.fun resb 1
148	.pParm resd 1
149	.pData resd 1
150	.sfn resw 1
151	.cbParm resw 1
152	.cbData resw 1
153	endstruc
154
155	;;
156	; Read/Write request packet
157	struc PKTRW
158	.cb resb 1
159	.unit resb 1
160	.cmd resb 1
161	.status resw 1
162	.res1 resd 1
163	.link resd 1
164
165	.media resb 1
166	.PhysTrans resd 1
167	.cbTrans resw 1
168	.start resd 1
169	.sfn resw 1
170	endstruc
171
172
173	;*******************************************************************************
174	;* Defined Constants And Macros *
175	;*******************************************************************************
176	; Some devhdr.inc stuff.
177	%define DEVLEV_3 0180h
178	%define DEV_30 0800h
179	%define DEV_IOCTL 4000h
180	%define DEV_CHAR_DEV 8000h
181
182	%define DEV_16MB 0002h
183	%define DEV_IOCTL2 0001h
184
185	; Some dhcalls.h stuff.
186	%define DevHlp_VirtToLin 05bh
187	%define DevHlp_SAVE_MESSAGE 03dh
188	%define DevHlp_EOI 031h
189	%define DevHlp_SetIRQ 01bh
190	%define DevHlp_PhysToVirt 015h
191
192	; Fast IOCtl category, also defined in VBoxGuest.h
193	%define VBGL_IOCTL_CATEGORY_FAST 0c3h
194
195	;;
196	; Got some nasm/link trouble, so emit the stuff ourselves.
197	; @param %1 Must be a GLOBALNAME.
198	%macro JMP32TO16 1
199	;jmp far dword NAME(%1) wrt CODE16
200	db 066h
201	db 0eah
202	dw NAME(%1) wrt CODE16
203	dw CODE16
204	%endmacro
205
206	;;
207	; Got some nasm/link trouble, so emit the stuff ourselves.
208	; @param %1 Must be a GLOBALNAME.
209	%macro JMP16TO32 1
210	;jmp far dword NAME(%1) wrt FLAT
211	db 066h
212	db 0eah
213	dd NAME(%1) ;wrt FLAT
214	dw TEXT32 wrt FLAT
215	%endmacro
216
217
218	;*******************************************************************************
219	;* External Symbols *
220	;*******************************************************************************
221	segment CODE16
222	extern DOS16OPEN
223	extern DOS16CLOSE
224	extern DOS16WRITE
225	extern DOS16DEVIOCTL2
226	segment TEXT32
227	extern KernThunkStackTo32
228	extern KernThunkStackTo16
229
230	extern NAME(vgdrvOS2Init)
231	extern NAME(vgdrvOS2Open)
232	extern NAME(vgdrvOS2Close)
233	extern NAME(vgdrvOS2IOCtl)
234	extern NAME(vgdrvOS2IOCtlFast)
235	extern NAME(vgdrvOS2IDCConnect)
236	extern NAME(VGDrvOS2IDCService)
237	extern NAME(vgdrvOS2ISR)
238
239
240	segment DATA16
241
242	;;
243	; Device headers. The first one is the one we'll be opening and the
244	; latter is only used for 32-bit initialization.
245	GLOBALNAME g_VBoxGuestHdr1
246	dw NAME(g_VBoxGuestHdr2) wrt DATA16 ; NextHeader.off
247	dw DATA16 ; NextHeader.sel
248	dw DEVLEV_3 \| DEV_30 \| DEV_CHAR_DEV \| DEV_IOCTL; SDevAtt
249	dw NAME(VGDrvOS2Entrypoint) wrt CODE16 ; StrategyEP
250	dw NAME(VGDrvOS2IDC) wrt CODE16 ; IDCEP
251	db 'vboxgst$' ; DevName
252	dw 0 ; SDevProtCS
253	dw 0 ; SDevProtDS
254	dw 0 ; SDevRealCS
255	dw 0 ; SDevRealDS
256	dd DEV_16MB \| DEV_IOCTL2 ; SDevCaps
257
258	align 4
259	GLOBALNAME g_VBoxGuestHdr2
260	dd 0ffffffffh ; NextHeader (NIL)
261	dw DEVLEV_3 \| DEV_30 \| DEV_CHAR_DEV ; SDevAtt
262	dw NAME(vgdrvOS2InitEntrypoint) wrt CODE16 ; StrategyEP
263	dw 0 ; IDCEP
264	db 'vboxgs1$' ; DevName
265	dw 0 ; SDevProtCS
266	dw 0 ; SDevProtDS
267	dw 0 ; SDevRealCS
268	dw 0 ; SDevRealDS
269	dd DEV_16MB \| DEV_IOCTL2 ; SDevCaps
270
271
272	;; Tristate 32-bit initialization indicator [0 = need init, -1 = init failed, 1 init succeeded].
273	; Check in the open path of the primary driver. The secondary driver will
274	; open the primary one during it's init and thereby trigger the 32-bit init.
275	GLOBALNAME g_fInitialized
276	db 0
277
278	align 4
279	;; Pointer to the device helper service routine
280	; This is set during the initialization of the 2nd device driver.
281	GLOBALNAME g_fpfnDevHlp
282	dd 0
283
284
285	;; vgdrvFindAdapter Output
286	; @{
287
288	;; The MMIO base of the VMMDev.
289	GLOBALNAME g_PhysMMIOBase
290	dd 0
291	;; The size of the MMIO memory of the VMMDev.
292	GLOBALNAME g_cbMMIO
293	dd 0
294	;; The I/O port base of the VMMDev.
295	GLOBALNAME g_IOPortBase
296	dw 0
297	;; The VMMDev Interrupt Line.
298	GLOBALNAME g_bInterruptLine
299	db 0
300	;; The PCI bus number returned by Find PCI Device.
301	GLOBALNAME g_bPciBusNo
302	db 0
303	;; The PCI Device No / Function Number returned by Find PCI Device.
304	; (The upper 5 bits is the number, and the lower 3 the function.)
305	GLOBALNAME g_bPciDevFunNo
306	db 0
307	;; Flag that is set by the vboxgst$ init routine if VMMDev was found.
308	; Both init routines must refuse loading the driver if the
309	; device cannot be located.
310	GLOBALNAME g_fFoundAdapter
311	db 0
312	;; @}
313
314
315	%ifdef DEBUG_READ
316	;; Where we write to the log.
317	GLOBALNAME g_offLogHead
318	dw 0
319	;; Where we read from the log.
320	GLOBALNAME g_offLogTail
321	dw 0
322	;; The size of the log. (power of two!)
323	%define LOG_SIZE 16384
324	GLOBALNAME g_cchLogMax
325	dw LOG_SIZE
326	;; The log buffer.
327	GLOBALNAME g_szLog
328	times LOG_SIZE db 0
329	%endif ; DEBUG_READ
330
331
332	;
333	; The init data.
334	;
335	segment DATA16_INIT
336	GLOBALNAME g_InitDataStart
337
338	;; Far pointer to the device argument.
339	g_fpszArgs:
340	dd 0
341
342	%if 0
343	;; Message table for the Save_Message device helper.
344	GLOBALNAME g_MsgTab
345	dw 1178 ; MsgId - 'MSG_REPLACEMENT_STRING'.
346	dw 1 ; cMsgStrings
347	dw NAME(g_szInitText) ; MsgStrings[0]
348	dw seg NAME(g_szInitText)
349	%else
350	;; Far pointer to DOS16WRITE (corrected set before called).
351	; Just a temporary hack to work around a wlink issue.
352	GLOBALNAME g_fpfnDos16Write
353	dw DOS16WRITE
354	dw seg DOS16WRITE
355	%endif
356
357	;; Size of the text currently in the g_szInitText buffer.
358	GLOBALNAME g_cchInitText
359	dw 0
360	;; The max size of text that can fit into the g_szInitText buffer.
361	GLOBALNAME g_cchInitTextMax
362	dw 512
363	;; The init text buffer.
364	GLOBALNAME g_szInitText
365	times 512 db 0
366
367	;; Message string that's written on failure.
368	g_achLoadFailureMsg1:
369	db 0dh,0ah,'VBoxGuest: load failure no. '
370	g_cchLoadFailureMsg1 EQU $ - g_achLoadFailureMsg1
371	g_achLoadFailureMsg2:
372	db '!',0dh,0ah
373	g_cchLoadFailureMsg2 EQU $ - g_achLoadFailureMsg2
374
375
376	;
377	; The 16-bit code segment.
378	;
379	segment CODE16
380
381
382	;;
383	; The strategy entry point (vboxdrv$).
384	;
385	; ss:bx -> request packet
386	; ds:si -> device header
387	;
388	; Can clobber any registers it likes except SP.
389	;
390	BEGINPROC VGDrvOS2Entrypoint
391	push ebp
392	mov ebp, esp
393	push es ; bp - 2
394	push bx ; bp - 4
395	and sp, 0fffch
396
397	;
398	; Check for the most frequent first.
399	;
400	cmp byte [es:bx + PKTHDR.cmd], 10h ; Generic IOCtl
401	jne near vgdrvOS2EP_NotGenIOCtl
402
403
404	;
405	; Generic I/O Control Request.
406	;
407	vgdrvOS2EP_GenIOCtl:
408
409	; Fast IOCtl?
410	cmp byte [es:bx + PKTIOCTL.cat], VBGL_IOCTL_CATEGORY_FAST
411	jne vgdrvOS2EP_GenIOCtl_Other
412
413	;
414	; Fast IOCtl.
415	; DECLASM(int) vgdrvOS2IOCtlFast(uint16_t sfn, uint8_t iFunction, uint16_t *pcbParm)
416	;
417	vgdrvOS2EP_GenIOCtl_Fast:
418	mov ax, [es:bx + PKTIOCTL.pData + 2] ; LDT selector to flat address.
419	shr ax, 3
420	shl eax, 16
421	mov ax, [es:bx + PKTIOCTL.pData]
422	push eax ; 08h - pointer to the rc buffer.
423
424	; function.
425	movzx edx, byte [es:bx + PKTIOCTL.fun]
426	push edx ; 04h
427
428	; system file number.
429	movzx eax, word [es:bx + PKTIOCTL.sfn]
430	push eax ; 00h
431
432	JMP16TO32 vgdrvOS2EP_GenIOCtl_Fast_32
433	segment TEXT32
434	GLOBALNAME vgdrvOS2EP_GenIOCtl_Fast_32
435
436	; switch stack to 32-bit.
437	mov ax, DATA32 wrt FLAT
438	mov ds, ax
439	mov es, ax
440	call KernThunkStackTo32
441
442	; call the C code (don't cleanup the stack).
443	call NAME(vgdrvOS2IOCtlFast)
444
445	; switch back the stack.
446	push eax
447	call KernThunkStackTo16
448	pop eax
449
450	JMP32TO16 vgdrvOS2EP_GenIOCtl_Fast_32
451	segment CODE16
452	GLOBALNAME vgdrvOS2EP_GenIOCtl_Fast_16
453
454	les bx, [bp - 4] ; Reload the packet pointer.
455	or eax, eax
456	jnz near vgdrvOS2EP_GeneralFailure
457
458	; setup output stuff.
459	mov edx, esp
460	mov eax, [ss:edx + 0ch] ; output sizes.
461	mov [es:bx + PKTIOCTL.cbParm], eax ; update cbParm and cbData.
462	mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
463
464	mov sp, bp
465	pop ebp
466	retf
467
468	;
469	; Other IOCtl (slow)
470	;
471	vgdrvOS2EP_GenIOCtl_Other:
472	mov eax, [es:bx + PKTIOCTL.cbParm] ; Load cbParm and cbData
473	push eax ; 1eh - in/out data size.
474	; 1ch - in/out parameter size.
475	push edx ; 18h - pointer to data size (filled in later).
476	push ecx ; 14h - pointer to param size (filled in later).
477
478	; pData (convert to flat 32-bit)
479	mov ax, word [es:bx + PKTIOCTL.pData + 2] ; selector
480	cmp ax, 3 ; <= 3 -> nil selector...
481	jbe .no_data
482	movzx esi, word [es:bx + PKTIOCTL.pData] ; offset
483	mov dl, DevHlp_VirtToLin
484	call far [NAME(g_fpfnDevHlp)]
485	jc near vgdrvOS2EP_GeneralFailure
486	jmp .finish_data
487	.no_data:
488	xor eax, eax
489	.finish_data:
490	push eax ; 10h
491
492	; pParm (convert to flat 32-bit)
493	mov ax, word [es:bx + PKTIOCTL.pParm + 2] ; selector
494	cmp ax, 3 ; <= 3 -> nil selector...
495	jbe .no_parm
496	movzx esi, word [es:bx + PKTIOCTL.pParm] ; offset
497	mov dl, DevHlp_VirtToLin
498	call far [NAME(g_fpfnDevHlp)]
499	jc near vgdrvOS2EP_GeneralFailure
500	jmp .finish_parm
501	.no_parm:
502	xor eax, eax
503	.finish_parm:
504	push eax ; 0ch
505
506	; function.
507	movzx edx, byte [es:bx + PKTIOCTL.fun]
508	push edx ; 08h
509
510	; category.
511	movzx ecx, byte [es:bx + PKTIOCTL.cat]
512	push ecx ; 04h
513
514	; system file number.
515	movzx eax, word [es:bx + PKTIOCTL.sfn]
516	push eax ; 00h
517
518	JMP16TO32 vgdrvOS2EP_GenIOCtl_Other_32
519	segment TEXT32
520	GLOBALNAME vgdrvOS2EP_GenIOCtl_Other_32
521
522	; switch stack to 32-bit.
523	mov ax, DATA32 wrt FLAT
524	mov ds, ax
525	mov es, ax
526	call KernThunkStackTo32
527
528	; update in/out parameter pointers
529	lea eax, [esp + 1ch]
530	mov [esp + 14h], eax
531	lea edx, [esp + 1eh]
532	mov [esp + 18h], edx
533
534	; call the C code (don't cleanup the stack).
535	call NAME(vgdrvOS2IOCtl)
536
537	; switch back the stack.
538	push eax
539	call KernThunkStackTo16
540	pop eax
541
542	JMP32TO16 vgdrvOS2EP_GenIOCtl_Other_16
543	segment CODE16
544	GLOBALNAME vgdrvOS2EP_GenIOCtl_Other_16
545
546	les bx, [bp - 4] ; Reload the packet pointer.
547	or eax, eax
548	jnz near vgdrvOS2EP_GeneralFailure
549
550	; setup output stuff.
551	mov edx, esp
552	mov eax, [ss:edx + 1ch] ; output sizes.
553	mov [es:bx + PKTIOCTL.cbParm], eax ; update cbParm and cbData.
554	mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
555
556	mov sp, bp
557	pop ebp
558	retf
559
560
561	;
562	; Less Performance Critical Requests.
563	;
564	vgdrvOS2EP_NotGenIOCtl:
565	cmp byte [es:bx + PKTHDR.cmd], 0dh ; Open
566	je vgdrvOS2EP_Open
567	cmp byte [es:bx + PKTHDR.cmd], 0eh ; Close
568	je vgdrvOS2EP_Close
569	cmp byte [es:bx + PKTHDR.cmd], 00h ; Init
570	je vgdrvOS2EP_Init
571	%ifdef DEBUG_READ
572	cmp byte [es:bx + PKTHDR.cmd], 04h ; Read
573	je near vgdrvOS2EP_Read
574	%endif
575	jmp near vgdrvOS2EP_NotSupported
576
577
578	;
579	; Open Request. w/ ring-0 init.
580	;
581	vgdrvOS2EP_Open:
582	cmp byte [NAME(g_fInitialized)], 1
583	jne vgdrvOS2EP_OpenOther
584
585	; First argument, the system file number.
586	movzx eax, word [es:bx + PKTOPEN.sfn]
587	push eax
588
589	JMP16TO32 vgdrvOS2EP_Open_32
590	segment TEXT32
591	GLOBALNAME vgdrvOS2EP_Open_32
592
593	; switch stack to 32-bit.
594	mov ax, DATA32 wrt FLAT
595	mov ds, ax
596	mov es, ax
597	call KernThunkStackTo32
598
599	; call the C code.
600	call NAME(vgdrvOS2Open)
601
602	; switch back the stack.
603	push eax
604	call KernThunkStackTo16
605	pop eax
606
607	JMP32TO16 vgdrvOS2EP_Open_16
608	segment CODE16
609	GLOBALNAME vgdrvOS2EP_Open_16
610
611	les bx, [bp - 4] ; Reload the packet pointer.
612	or eax, eax
613	jnz near vgdrvOS2EP_GeneralFailure
614	mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
615	jmp near vgdrvOS2EP_Done
616
617	; Initializing or failed init?
618	vgdrvOS2EP_OpenOther:
619	cmp byte [NAME(g_fInitialized)], 0
620	jne vgdrvOS2EP_OpenFailed
621
622	mov byte [NAME(g_fInitialized)], -1
623	call NAME(vgdrvRing0Init)
624	cmp byte [NAME(g_fInitialized)], 1
625	je vgdrvOS2EP_Open
626
627	vgdrvOS2EP_OpenFailed:
628	mov word [es:bx + PKTHDR.status], 0810fh ; error, done, init failed.
629	jmp near vgdrvOS2EP_Done
630
631
632	;
633	; Close Request.
634	;
635	vgdrvOS2EP_Close:
636	; First argument, the system file number.
637	movzx eax, word [es:bx + PKTOPEN.sfn]
638	push eax
639
640	JMP16TO32 vgdrvOS2EP_Close_32
641	segment TEXT32
642	GLOBALNAME vgdrvOS2EP_Close_32
643
644	; switch stack to 32-bit.
645	mov ax, DATA32 wrt FLAT
646	mov ds, ax
647	mov es, ax
648	call KernThunkStackTo32
649
650	; call the C code.
651	call NAME(vgdrvOS2Close)
652
653	; switch back the stack.
654	push eax
655	call KernThunkStackTo16
656	pop eax
657
658	JMP32TO16 vgdrvOS2EP_Close_16
659	segment CODE16
660	GLOBALNAME vgdrvOS2EP_Close_16
661
662	les bx, [bp - 4] ; Reload the packet pointer.
663	or eax, eax
664	jnz near vgdrvOS2EP_GeneralFailure
665	mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
666	jmp near vgdrvOS2EP_Done
667
668
669	;
670	; Init Request.
671	; Find the VMMDev adapter so we can unload the driver (and avoid trouble) if not found.
672	;
673	vgdrvOS2EP_Init:
674	call NAME(vgdrvFindAdapter)
675	test ax, ax
676	jz .ok
677	mov word [es:bx + PKTHDR.status], 0810fh ; error, done, init failed.
678	call NAME(vgdrvOS2InitFlushText)
679	jmp .next
680	.ok:
681	mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
682	.next:
683	mov byte [es:bx + PKTINITOUT.cUnits], 0
684	mov word [es:bx + PKTINITOUT.cbCode16], NAME(g_InitCodeStart) wrt CODE16
685	mov word [es:bx + PKTINITOUT.cbData16], NAME(g_InitDataStart) wrt DATA16
686	mov dword [es:bx + PKTINITOUT.fpaBPBs], 0
687	jmp near vgdrvOS2EP_Done
688
689
690	%ifdef DEBUG_READ
691	;
692	; Read Request.
693	; Return log data.
694	;
695	vgdrvOS2EP_Read:
696	; Any log data available?
697	xor dx, dx
698	mov ax, [NAME(g_offLogTail)]
699	cmp ax, [NAME(g_offLogHead)]
700	jz near .log_done
701
702	; create a temporary mapping of the physical buffer. Docs claims it trashes nearly everything...
703	push ebp
704	mov cx, [es:bx + PKTRW.cbTrans]
705	push cx
706	mov ax, [es:bx + PKTRW.PhysTrans + 2]
707	mov bx, [es:bx + PKTRW.PhysTrans]
708	mov dh, 1
709	mov dl, DevHlp_PhysToVirt
710	call far [NAME(g_fpfnDevHlp)]
711	pop bx ; bx = cbTrans
712	pop ebp
713	jc near .log_phystovirt_failed
714	; es:di -> the output buffer.
715
716	; setup the copy operation.
717	mov ax, [NAME(g_offLogTail)]
718	xor dx, dx ; dx tracks the number of bytes copied.
719	.log_loop:
720	mov cx, [NAME(g_offLogHead)]
721	cmp ax, cx
722	je .log_done
723	jb .log_loop_before
724	mov cx, LOG_SIZE
725	.log_loop_before: ; cx = end offset
726	sub cx, ax ; cx = sequential bytes to copy.
727	cmp cx, bx
728	jbe .log_loop_min
729	mov cx, bx ; output buffer is smaller than available data.
730	.log_loop_min:
731	mov si, NAME(g_szLog)
732	add si, ax ; ds:si -> the log buffer.
733	add dx, cx ; update output counter
734	add ax, cx ; calc new offLogTail
735	and ax, LOG_SIZE - 1
736	rep movsb ; do the copy
737	mov [NAME(g_offLogTail)], ax ; commit the read.
738	jmp .log_loop
739
740	.log_done:
741	les bx, [bp - 4] ; Reload the packet pointer.
742	mov word [es:bx + PKTRW.cbTrans], dx
743	mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
744	jmp near vgdrvOS2EP_Done
745
746	.log_phystovirt_failed:
747	les bx, [bp - 4] ; Reload the packet pointer.
748	jmp vgdrvOS2EP_GeneralFailure
749	%endif ; DEBUG_READ
750
751
752	;
753	; Return 'unknown command' error.
754	;
755	vgdrvOS2EP_NotSupported:
756	mov word [es:bx + PKTHDR.status], 08103h ; error, done, unknown command.
757	jmp vgdrvOS2EP_Done
758
759	;
760	; Return 'general failure' error.
761	;
762	vgdrvOS2EP_GeneralFailure:
763	mov word [es:bx + PKTHDR.status], 0810ch ; error, done, general failure.
764	jmp vgdrvOS2EP_Done
765
766	;
767	; Non-optimized return path.
768	;
769	vgdrvOS2EP_Done:
770	mov sp, bp
771	pop ebp
772	retf
773	ENDPROC VGDrvOS2Entrypoint
774
775
776	;;
777	; The helper device entry point.
778	;
779	; This is only used to do the DosOpen on the main driver so we can
780	; do ring-3 init and report failures.
781	;
782	GLOBALNAME vgdrvOS2InitEntrypoint
783	; The only request we're servicing is the 'init' one.
784	cmp word [es:bx + PKTHDR.cmd], 0
785	je near NAME(vgdrvOS2InitEntrypointServiceInitReq)
786
787	; Ok, it's not the init request, just fail it.
788	mov word [es:bx + PKTHDR.status], 08103h ; error, done, unknown command.
789	retf
790
791
792	;;
793	; The OS/2 IDC entry point.
794	;
795	; This is only used to setup connection, the returned structure
796	; will provide the entry points that we'll be using.
797	;
798	; @cproto void far __cdecl VGDrvOS2IDC(VBOXGUESTOS2IDCCONNECT far *fpConnectInfo);
799	;
800	; @param fpConnectInfo [bp + 8] Pointer to an VBOXGUESTOS2IDCCONNECT structure.
801	;
802	GLOBALNAME VGDrvOS2IDC
803	push ebp ; bp - 0h
804	mov ebp, esp
805	; save everything we might touch.
806	push es ; bp - 2h
807	push ds ; bp - 4h
808	push eax ; bp - 8h
809	push ebx ; bp - 0ch
810	push ecx ; bp - 10h
811	push edx ; bp - 14h
812	and sp, 0fffch
813
814	JMP16TO32 VGDrvOS2IDC_32
815	segment TEXT32
816	GLOBALNAME VGDrvOS2IDC_32
817
818	; switch stack to 32-bit.
819	mov ax, DATA32 wrt FLAT
820	mov ds, ax
821	mov es, ax
822	call KernThunkStackTo32
823
824	; call the C code.
825	call NAME(vgdrvOS2IDCConnect)
826
827	;
828	; Load the return buffer address into ds:ebx and setup the buffer.
829	; (eax == u32Session)
830	;
831	mov cx, [ebp + 08h + 2]
832	mov ds, cx
833	movzx ebx, word [ebp + 08h]
834
835	mov dword [ebx + VBGLOS2ATTACHDD.u32Version ], VBGL_IOC_VERSION
836	mov dword [ebx + VBGLOS2ATTACHDD.u32Session ], eax
837	mov dword [ebx + VBGLOS2ATTACHDD.pfnServiceEP ], NAME(VGDrvOS2IDCService)
838	mov word [ebx + VBGLOS2ATTACHDD.fpfnServiceEP ], NAME(VGDrvOS2IDCService16) wrt CODE16
839	mov word [ebx + VBGLOS2ATTACHDD.fpfnServiceEP + 2], CODE16
840	mov word [ebx + VBGLOS2ATTACHDD.fpfnServiceAsmEP ], NAME(VGDrvOS2IDCService16Asm) wrt CODE16
841	mov word [ebx + VBGLOS2ATTACHDD.fpfnServiceAsmEP+2],CODE16
842
843	mov ax, DATA32 wrt FLAT
844	mov ds, ax
845
846	; switch back the stack.
847	call KernThunkStackTo16
848
849	JMP32TO16 VGDrvOS2IDC_16
850	segment CODE16
851	GLOBALNAME VGDrvOS2IDC_16
852
853	; restore.
854	lea sp, [bp - 14h]
855	pop edx
856	pop ecx
857	pop ebx
858	pop eax
859	pop ds
860	pop es
861	pop ebp
862	retf
863	ENDPROC VGDrvOS2IDC
864
865
866	;;
867	; The 16-bit IDC entry point, cdecl.
868	;
869	; All this does is thunking the request into something that fits
870	; the 32-bit IDC service routine.
871	;
872	;
873	; @returns VBox status code.
874	; @param u32Session bp + 8h - The above session handle.
875	; @param iFunction bp + 0ch - The requested function.
876	; @param fpReqHdr bp + 0eh - The input/output data buffer. The caller ensures that this
877	; cannot be swapped out, or that it's acceptable to take a
878	; page in fault in the current context. If the request doesn't
879	; take input or produces output, passing NULL is okay.
880	; @param cbReq bp + 12h - The size of the data buffer.
881	;
882	; @cproto long far __cdecl VGDrvOS2IDCService16(uint32_t u32Session, uint16_t iFunction, void far *fpReqHdr, uint16_t cbReq);
883	;
884	GLOBALNAME VGDrvOS2IDCService16
885	push ebp ; bp - 0h
886	mov ebp, esp
887	push es ; bp - 2h
888	push ds ; bp - 4h
889	push ecx ; bp - 8h
890	push edx ; bp - 0ch
891	push esi ; bp - 10h
892	and sp, 0fffch ; align the stack.
893
894	; locals
895	push dword 0 ; esp + 18h (dd): cbDataReturned
896
897	; load our ds (for g_fpfnDevHlp).
898	mov ax, DATA16
899	mov ds, ax
900
901	;
902	; Create the call frame before switching.
903	;
904	movzx ecx, word [bp + 12h]
905	push ecx ; esp + 10h: cbData
906
907	; thunk data argument if present.
908	mov ax, [bp + 0eh + 2] ; selector
909	cmp ax, 3 ; <= 3 -> nil selector...
910	jbe .no_data
911	movzx esi, word [bp + 0eh] ; offset
912	mov dl, DevHlp_VirtToLin
913	call far [NAME(g_fpfnDevHlp)]
914	jc near VGDrvOS2IDCService16_InvalidPointer
915	jmp .finish_data
916	.no_data:
917	xor eax, eax
918	.finish_data:
919	push eax ; esp + 08h: pvData
920	movzx edx, word [bp + 0ch]
921	push edx ; esp + 04h: iFunction
922	mov ecx, [bp + 08h]
923	push ecx ; esp + 00h: u32Session
924
925	JMP16TO32 VGDrvOS2IDCService16_32
926	segment TEXT32
927	GLOBALNAME VGDrvOS2IDCService16_32
928
929	; switch stack to 32-bit.
930	mov ax, DATA32 wrt FLAT
931	mov ds, ax
932	mov es, ax
933	call KernThunkStackTo32
934
935	; call the C code (don't cleanup the stack).
936	call NAME(VGDrvOS2IDCService)
937
938	; switch back the stack.
939	push eax
940	call KernThunkStackTo16
941	pop eax
942
943	JMP32TO16 VGDrvOS2IDCService16_16
944	segment CODE16
945	GLOBALNAME VGDrvOS2IDCService16_16
946
947	VGDrvOS2IDCService16_Done:
948	lea sp, [bp - 10h]
949	pop esi
950	pop edx
951	pop ecx
952	pop ds
953	pop es
954	pop ebp
955	retf
956
957	VGDrvOS2IDCService16_InvalidPointer:
958	mov ax, VERR_INVALID_POINTER
959	jmp VGDrvOS2IDCService16_Done
960	ENDPROC VGDrvOS2IDCService16
961
962
963	;;
964	; The 16-bit IDC entry point, register based.
965	;
966	; This is just a wrapper around VGDrvOS2IDCService16 to simplify
967	; calls from 16-bit assembly code.
968	;
969	; @returns ax: VBox status code; cx: The amount of data returned.
970	;
971	; @param u32Session eax - The above session handle.
972	; @param iFunction dl - The requested function.
973	; @param pvData es:bx - The input/output data buffer.
974	; @param cbData cx - The size of the data buffer.
975	;
976	GLOBALNAME VGDrvOS2IDCService16Asm
977	push ebp ; bp - 0h
978	mov ebp, esp
979	push edx ; bp - 4h
980
981	push cx ; cbData
982	push es
983	xor dh, dh
984	push dx
985	push eax
986	call NAME(VGDrvOS2IDCService16)
987
988	mov cx, [es:bx + VBGLREQHDR.cbOut]
989
990	mov edx, [bp - 4]
991	mov esp, ebp
992	pop ebp
993	retf
994	ENDPROC VGDrvOS2IDCService16Asm
995
996
997
998	;;
999	; The 16-bit interrupt service routine.
1000	;
1001	; OS/2 saves all registers according to the docs, although it doesn't say whether
1002	; this includes the 32-bit parts. Since it doesn't cost much to be careful, save
1003	; everything.
1004	;
1005	; @returns CF=0 if it's our interrupt, CF=1 it it isn't.
1006	;
1007	;
1008	GLOBALNAME vgdrvOS2ISR16
1009	push ebp
1010	mov ebp, esp
1011	pushf ; bp - 02h
1012	cli
1013	push eax ; bp - 06h
1014	push edx ; bp - 0ah
1015	push ebx ; bp - 0eh
1016	push ds ; bp - 10h
1017	push es ; bp - 12h
1018	push ecx ; bp - 16h
1019	push esi ; bp - 1ah
1020	push edi ; bp - 1eh
1021
1022	and sp, 0fff0h ; align the stack (16-bytes make GCC extremely happy).
1023
1024	JMP16TO32 vgdrvOS2ISR16_32
1025	segment TEXT32
1026	GLOBALNAME vgdrvOS2ISR16_32
1027
1028	mov ax, DATA32 wrt FLAT
1029	mov ds, ax
1030	mov es, ax
1031
1032	call KernThunkStackTo32
1033
1034	call NAME(vgdrvOS2ISR)
1035	mov ebx, eax
1036
1037	call KernThunkStackTo16
1038
1039	JMP32TO16 vgdrvOS2ISR16_16
1040	segment CODE16
1041	GLOBALNAME vgdrvOS2ISR16_16
1042
1043	lea sp, [bp - 1eh]
1044	pop edi
1045	pop esi
1046	pop ecx
1047	pop es
1048	pop ds
1049	test bl, 0ffh
1050	jnz .our
1051	pop ebx
1052	pop edx
1053	pop eax
1054	popf
1055	pop ebp
1056	stc
1057	retf
1058
1059	;
1060	; Do EIO.
1061	;
1062	.our:
1063	mov al, [NAME(g_bInterruptLine)]
1064	mov dl, DevHlp_EOI
1065	call far [NAME(g_fpfnDevHlp)]
1066
1067	pop ebx
1068	pop edx
1069	pop eax
1070	popf
1071	pop ebp
1072	clc
1073	retf
1074	ENDPROC vgdrvOS2ISR16
1075
1076
1077
1078
1079
1080
1081	;
1082	; The 32-bit text segment.
1083	;
1084	segment TEXT32
1085	;;
1086	; 32-bit worker for registering the ISR.
1087	;
1088	; @returns 0 on success, some non-zero OS/2 error code on failure.
1089	; @param bIrq [ebp + 8] The IRQ number. (uint8_t)
1090	;
1091	GLOBALNAME vgdrvOS2DevHlpSetIRQ
1092	push ebp
1093	mov ebp, esp
1094	push ebx
1095	push ds
1096
1097	call KernThunkStackTo16
1098
1099	movzx ebx, byte [ebp + 8] ; load bIrq into BX.
1100
1101	JMP32TO16 vgdrvOS2DevHlpSetIRQ_16
1102	segment CODE16
1103	GLOBALNAME vgdrvOS2DevHlpSetIRQ_16
1104
1105	mov ax, DATA16 ; for g_fpfnDevHlp.
1106	mov ds, ax
1107	mov ax, NAME(vgdrvOS2ISR16) ; The devhlp assume it's relative to DS.
1108	mov dh, 1 ; 1 = shared
1109	mov dl, DevHlp_SetIRQ
1110	call far [NAME(g_fpfnDevHlp)]
1111	jnc .ok
1112	movzx eax, ax
1113	or eax, eax
1114	jnz .go_back
1115	or eax, 6
1116	jmp .go_back
1117	.ok:
1118	xor eax, eax
1119
1120	.go_back:
1121	JMP16TO32 vgdrvOS2DevHlpSetIRQ_32
1122	segment TEXT32
1123	GLOBALNAME vgdrvOS2DevHlpSetIRQ_32
1124
1125	pop ds ; KernThunkStackTo32 ASSUMES flat DS and ES.
1126
1127	mov ebx, eax
1128	call KernThunkStackTo32
1129	mov eax, ebx
1130
1131	pop ebx
1132	pop ebp
1133	ret
1134	ENDPROC vgdrvOS2DevHlpSetIRQ
1135
1136
1137
1138
1139	;
1140	; The 16-bit init code.
1141	;
1142	segment CODE16_INIT
1143	GLOBALNAME g_InitCodeStart
1144
1145	;; The device name for DosOpen.
1146	g_szDeviceName:
1147	db '\DEV\vboxgst$', 0
1148
1149	; icsdebug can't see where stuff starts otherwise. (kDevTest)
1150	int3
1151	int3
1152	int3
1153	int3
1154	int3
1155	int3
1156
1157	;;
1158	; The Ring-3 init code.
1159	;
1160	BEGINPROC vgdrvOS2InitEntrypointServiceInitReq
1161	push ebp
1162	mov ebp, esp
1163	push es ; bp - 2
1164	push sp ; bp - 4
1165	push -1 ; bp - 6: hfOpen
1166	push 0 ; bp - 8: usAction
1167	and sp, 0fffch
1168
1169	; check for the init package.
1170	cmp word [es:bx + PKTHDR.cmd], 0
1171	jne near .not_init
1172
1173	; check that we found the VMMDev.
1174	test byte [NAME(g_fFoundAdapter)], 1
1175	jz near .done_err
1176
1177	;
1178	; Copy the data out of the init packet.
1179	;
1180	mov eax, [es:bx + PKTINITIN.fpfnDevHlp]
1181	mov [NAME(g_fpfnDevHlp)], eax
1182	mov edx, [es:bx + PKTINITIN.fpszArgs]
1183	mov [g_fpszArgs], edx
1184
1185	;
1186	; Open the first driver, close it, and check status.
1187	;
1188
1189	; APIRET _Pascal DosOpen(PSZ pszFname, PHFILE phfOpen, PUSHORT pusAction,
1190	; ULONG ulFSize, USHORT usAttr, USHORT fsOpenFlags,
1191	; USHORT fsOpenMode, ULONG ulReserved);
1192	push seg g_szDeviceName ; pszFname
1193	push g_szDeviceName
1194	push ss ; phfOpen
1195	lea dx, [bp - 6]
1196	push dx
1197	push ss ; pusAction
1198	lea dx, [bp - 8]
1199	push dx
1200	push dword 0 ; ulFSize
1201	push 0 ; usAttr = FILE_NORMAL
1202	push 1 ; fsOpenFlags = FILE_OPEN
1203	push 00040h ; fsOpenMode = OPEN_SHARE_DENYNONE \| OPEN_ACCESS_READONLY
1204	push dword 0 ; ulReserved
1205	call far DOS16OPEN
1206
1207	push ax ; Quickly flush any text.
1208	call NAME(vgdrvOS2InitFlushText)
1209	pop ax
1210
1211	or ax, ax
1212	jnz .done_err
1213
1214	; APIRET APIENTRY DosClose(HFILE hf);
1215	mov cx, [bp - 6]
1216	push cx
1217	call far DOS16CLOSE
1218	or ax, ax
1219	jnz .done_err ; This can't happen (I hope).
1220
1221	;
1222	; Ok, we're good.
1223	;
1224	mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
1225	mov byte [es:bx + PKTINITOUT.cUnits], 0
1226	mov word [es:bx + PKTINITOUT.cbCode16], NAME(g_InitCodeStart) wrt CODE16
1227	mov word [es:bx + PKTINITOUT.cbData16], NAME(g_InitDataStart) wrt DATA16
1228	mov dword [es:bx + PKTINITOUT.fpaBPBs], 0
1229	jmp .done
1230
1231	;
1232	; Init failure.
1233	;
1234	.done_err:
1235	mov word [es:bx + PKTHDR.status], 0810fh ; error, done, init failed.
1236	mov byte [es:bx + PKTINITOUT.cUnits], 0
1237	mov word [es:bx + PKTINITOUT.cbCode16], 0
1238	mov word [es:bx + PKTINITOUT.cbData16], 0
1239	mov dword [es:bx + PKTINITOUT.fpaBPBs], 0
1240	jmp .done
1241
1242	;
1243	; Not init, return 'unknown command'.
1244	;
1245	.not_init:
1246	mov word [es:bx + PKTHDR.status], 08103h ; error, done, unknown command.
1247	jmp .done
1248
1249	;
1250	; Request done.
1251	;
1252	.done:
1253	mov sp, bp
1254	pop ebp
1255	retf
1256	ENDPROC vgdrvOS2InitEntrypointServiceInitReq
1257
1258
1259	;;
1260	; The Ring-0 init code.
1261	;
1262	BEGINPROC vgdrvRing0Init
1263	push es
1264	push esi
1265	push ebp
1266	mov ebp, esp
1267	and sp, 0fffch
1268
1269	;
1270	; Thunk the argument string pointer first.
1271	;
1272	movzx esi, word [g_fpszArgs] ; offset
1273	mov ax, [g_fpszArgs + 2] ; selector
1274	mov dl, DevHlp_VirtToLin
1275	call far [NAME(g_fpfnDevHlp)]
1276	jc near vgdrvRing0Init_done ; eax is non-zero on failure (can't happen)
1277	push eax ; 00h - pszArgs (for vgdrvOS2Init).
1278
1279	;
1280	; Do 16-bit init?
1281	;
1282
1283
1284	;
1285	; Do 32-bit init
1286	;
1287	JMP16TO32 vgdrvRing0Init_32
1288	segment TEXT32
1289	GLOBALNAME vgdrvRing0Init_32
1290
1291	; switch stack to 32-bit.
1292	mov ax, DATA32 wrt FLAT
1293	mov ds, ax
1294	mov es, ax
1295	call KernThunkStackTo32
1296
1297	; call the C code.
1298	call NAME(vgdrvOS2Init)
1299
1300	; switch back the stack and reload ds.
1301	push eax
1302	call KernThunkStackTo16
1303	pop eax
1304
1305	mov dx, seg NAME(g_fInitialized)
1306	mov ds, dx
1307
1308	JMP32TO16 vgdrvRing0Init_16
1309	segment CODE16_INIT
1310	GLOBALNAME vgdrvRing0Init_16
1311
1312	; check the result and set g_fInitialized on success.
1313	or eax, eax
1314	jnz vgdrvRing0Init_done
1315	mov byte [NAME(g_fInitialized)], 1
1316
1317	vgdrvRing0Init_done:
1318	mov sp, bp
1319	pop ebp
1320	pop esi
1321	pop es
1322	ret
1323	ENDPROC vgdrvRing0Init
1324
1325
1326	;;
1327	; Flush any text in the text buffer.
1328	;
1329	BEGINPROC vgdrvOS2InitFlushText
1330	push bp
1331	mov bp, sp
1332
1333	; Anything in the buffer?
1334	mov ax, [NAME(g_cchInitText)]
1335	or ax, ax
1336	jz .done
1337
1338	%if 1
1339	; Write it to STDOUT.
1340	; APIRET _Pascal DosWrite(HFILE hf, PVOID pvBuf, USHORT cbBuf, PUSHORT pcbBytesWritten);
1341	push ax ; bp - 2 : cbBytesWritten
1342	mov cx, sp
1343	push 1 ; STDOUT
1344	push seg NAME(g_szInitText) ; pvBuf
1345	push NAME(g_szInitText)
1346	push ax ; cbBuf
1347	push ss ; pcbBytesWritten
1348	push cx
1349	%if 0 ; wlink generates a non-aliased fixup here which results in 16-bit offset with the flat 32-bit selector.
1350	call far DOS16WRITE
1351	%else
1352	; convert flat pointer to a far pointer using the tiled algorithm.
1353	push ds
1354	mov ax, DATA32 wrt FLAT
1355	mov ds, ax
1356	mov eax, g_pfnDos16Write wrt FLAT
1357	movzx eax, word [eax + 2] ; High word of the flat address (in DATA32).
1358	shl ax, 3
1359	or ax, 0007h
1360	pop ds
1361	mov [NAME(g_fpfnDos16Write) + 2], ax ; Update the selector (in DATA16_INIT).
1362	; do the call
1363	call far [NAME(g_fpfnDos16Write)]
1364	%endif
1365
1366	%else ; alternative workaround for the wlink issue.
1367	; Use the save message devhlp.
1368	push esi
1369	push ebx
1370	xor bx, bx
1371	mov si, NAME(g_MsgTab)
1372	mov dx, seg NAME(g_MsgTab)
1373	mov ds, dx
1374	mov dl, DevHlp_SAVE_MESSAGE
1375	call far [NAME(g_fpfnDevHlp)]
1376	pop ebx
1377	pop esi
1378	%endif
1379
1380	; Empty the buffer.
1381	mov word [NAME(g_cchInitText)], 0
1382	mov byte [NAME(g_szInitText)], 0
1383
1384	.done:
1385	mov sp, bp
1386	pop bp
1387	ret
1388	ENDPROC vgdrvOS2InitFlushText
1389
1390
1391	;; The device name for DosOpen.
1392	g_szOemHlpDevName:
1393	db '\DEV\OEMHLP$', 0
1394
1395
1396	;;
1397	; Talks to OEMHLP$ about finding the VMMDev PCI adapter.
1398	;
1399	; On success g_fFoundAdapter is set to 1, and g_cbMMIO,
1400	; g_PhysMMIOBase and g_IOPortBase are initialized with
1401	; the PCI data.
1402	;
1403	; @returns 0 on success, non-zero on failure. (eax)
1404	;
1405	; @remark ASSUMES DS:DATA16.
1406	; @uses nothing.
1407	;
1408	BEGINPROC vgdrvFindAdapter
1409	push ebx
1410	push ecx
1411	push edx
1412	push esi
1413	push edi
1414	push ebp
1415	mov ebp, esp
1416	push -1 ; bp - 2: hfOpen
1417	%define hfOpen bp - 2
1418	push 0 ; bp - 4: usAction
1419	%define usAction bp - 4
1420	sub sp, 20h ; bp - 44: 32 byte parameter buffer.
1421	%define abParm bp - 24h
1422	sub sp, 40h ; bp - c4: 32 byte data buffer.
1423	%define abData bp - 44h
1424
1425	;; VBox stuff
1426	%define VBOX_PCI_VENDORID 080eeh
1427	%define VMMDEV_DEVICEID 0cafeh
1428
1429	;; OEMHLP$ stuff.
1430	%define IOCTL_OEMHLP 80h
1431	%define OEMHLP_PCI 0bh
1432	%define PCI_FIND_DEVICE 1
1433	%define PCI_READ_CONFIG 3
1434
1435	;; PCI stuff
1436	%define PCI_INTERRUPT_LINE 03ch ;;< 8-bit RW - Interrupt line.
1437	%define PCI_BASE_ADDRESS_0 010h ;;< 32-bit RW */
1438	%define PCI_BASE_ADDRESS_1 014h ;;< 32-bit RW */
1439
1440
1441	%macro CallIOCtl 2
1442	; APIRET _Pascal DosDevIOCtl2(PVOID pData, USHORT cbData, PVOID pParm,
1443	; USHORT cbParm, USHORT usFun, USHORT usCategory,
1444	; HFILE hDev);
1445	push ss ; pData
1446	lea dx, [abData]
1447	push dx
1448	push %2 ; cbData
1449
1450	push ss ; pParm
1451	lea dx, [abParm]
1452	push dx
1453	push %1 ; cbParm
1454	push OEMHLP_PCI ; usFun
1455	push IOCTL_OEMHLP ; usCategory
1456
1457	mov ax, [hfOpen] ; hDev
1458	push ax
1459	call far DOS16DEVIOCTL2
1460
1461	; check for error.
1462	test ax, ax
1463	jnz near .done_err_close
1464	cmp [abData + 0], byte 0
1465	jne near .done_err_close
1466	%endmacro
1467
1468
1469	;
1470	; Open the OEMHLP$ driver.
1471	;
1472
1473	; APIRET _Pascal DosOpen(PSZ pszFname, PHFILE phfOpen, PUSHORT pusAction,
1474	; ULONG ulFSize, USHORT usAttr, USHORT fsOpenFlags,
1475	; USHORT fsOpenMode, ULONG ulReserved);
1476	mov di, '0'
1477	push seg g_szOemHlpDevName ; pszFname
1478	push g_szOemHlpDevName
1479	push ss ; phfOpen
1480	lea dx, [hfOpen]
1481	push dx
1482	push ss ; pusAction
1483	lea dx, [usAction]
1484	push dx
1485	push dword 0 ; ulFSize
1486	push 0 ; usAttr = FILE_NORMAL
1487	push 1 ; fsOpenFlags = FILE_OPEN
1488	push 00040h ; fsOpenMode = OPEN_SHARE_DENYNONE \| OPEN_ACCESS_READONLY
1489	push dword 0 ; ulReserved
1490	call far DOS16OPEN
1491	or ax, ax
1492	jnz near .done
1493
1494
1495	;
1496	; Send a PCI_FIND_DEVICE request.
1497	;
1498
1499	; Initialize the parameter packet.
1500	mov [abParm + 0], byte PCI_FIND_DEVICE ; 0 - db - SubFunction Number
1501	mov [abParm + 1], word VMMDEV_DEVICEID ; 1 - dw - Device ID
1502	mov [abParm + 3], word VBOX_PCI_VENDORID ; 3 - dw - Vendor ID
1503	mov [abParm + 5], byte 0 ; 5 - db - (Device) Index
1504
1505	; Zero padd the data packet.
1506	mov [abData + 0], dword 0
1507
1508	mov di, '1'
1509	CallIOCtl 6, 3
1510
1511	mov al, [abData + 1] ; 1 - db - Bus Number.
1512	mov [NAME(g_bPciBusNo)], al
1513	mov al, [abData + 2] ; 2 - db - DevFunc Number.
1514	mov [NAME(g_bPciDevFunNo)], al
1515
1516	;
1517	; Read the interrupt register (byte).
1518	;
1519	mov di, '2'
1520	mov ax, PCI_INTERRUPT_LINE \| 0100h
1521	call .NestedReadReg
1522	mov [NAME(g_bInterruptLine)], al
1523
1524	;
1525	; Read the first base address (dword), this shall must be in I/O space.
1526	;
1527	mov di, '3'
1528	mov ax, PCI_BASE_ADDRESS_0 \| 0400h
1529	call .NestedReadReg
1530	mov di, '4'
1531	test al, 1h ; Test that it's an I/O space address.
1532	jz .done_err_close
1533	mov di, '5'
1534	test eax, 0ffff0002h ; These shall all be 0 according to the specs.
1535	jnz .done_err_close
1536	and ax, 0fffeh
1537	mov [NAME(g_IOPortBase)], ax
1538
1539	;
1540	; Read the second base address (dword), this shall be in memory space if present.
1541	;
1542	mov di, '6'
1543	mov ax, PCI_BASE_ADDRESS_1 \| 0400h
1544	call .NestedReadReg
1545	mov di, '7'
1546	test al, 1h ; Test that it's a memory space address.
1547	jnz .done_err_close
1548	and eax, 0fffffff0h
1549	mov [NAME(g_PhysMMIOBase)], eax
1550
1551	;or eax, eax
1552	;jz .done_success ; No memory region.
1553	;; @todo If there is a simple way of determining the size do that, if
1554	; not we can easily handle it the code that does the actual mapping.
1555
1556
1557	;
1558	; Ok, we're good!
1559	;
1560	.done_success:
1561	or [NAME(g_fFoundAdapter)], byte 1
1562	jmp .done_close
1563
1564	;
1565	; Close the OEMHLP$ driver.
1566	;
1567	.done_err_close:
1568	or ax, 80h
1569	.done_close:
1570	; APIRET APIENTRY DosClose(HFILE hf);
1571	push ax ; Save result
1572	mov cx, [hfOpen]
1573	push cx
1574	call far DOS16CLOSE
1575	or ax, ax
1576	jnz .bitch ; This can't happen (I hope).
1577	pop ax
1578	or ax, ax
1579	jnz .bitch
1580
1581	;
1582	; Return to vgdrvOS2EP_Init.
1583	;
1584	.done:
1585	mov esp, ebp
1586	pop ebp
1587	pop edi
1588	pop esi
1589	pop edx
1590	pop ecx
1591	pop ebx
1592	ret
1593
1594
1595	;
1596	; Puts the reason for failure in message buffer.
1597	; The caller will flush this.
1598	;
1599	.bitch:
1600	push es
1601
1602	mov ax, ds
1603	mov es, ax
1604	mov ax, di ; save the reason.
1605	mov di, NAME(g_szInitText)
1606	add di, [NAME(g_cchInitText)]
1607
1608	mov si, g_achLoadFailureMsg1
1609	mov cx, g_cchLoadFailureMsg1
1610	rep movsb
1611
1612	stosb
1613
1614	mov si, g_achLoadFailureMsg2
1615	mov cx, g_cchLoadFailureMsg2
1616	rep movsb
1617
1618	mov [di], byte 0
1619	sub di, NAME(g_szInitText)
1620	mov [NAME(g_cchInitText)], di
1621
1622	pop es
1623	jmp .done
1624
1625
1626	;
1627	; Nested function which reads a PCI config register.
1628	; (This operates on the vgdrvFindAdapter stack frame.)
1629	;
1630	; Input:
1631	; al - register to read
1632	; ah - register size.
1633	;
1634	; Output:
1635	; eax - the value.
1636	;
1637	; Uses:
1638	; dx
1639	;
1640	.NestedReadReg:
1641	; Fill in the request packet.
1642	mov [abParm + 0], byte PCI_READ_CONFIG ; 0 - db - SubFunction Number
1643	mov dl, [NAME(g_bPciBusNo)]
1644	mov [abParm + 1], dl ; 1 - db - Bus Number
1645	mov dl, [NAME(g_bPciDevFunNo)]
1646	mov [abParm + 2], dl ; 2 - db - DevFunc Number
1647	mov [abParm + 3], al ; 3 - db - Configuration Register
1648	mov [abParm + 4], ah ; 4 - db - (Register) Size
1649
1650	; Pad the data packet.
1651	mov [abData + 0], dword 0
1652	mov [abData + 4], dword 0
1653
1654	CallIOCtl 5, 5
1655
1656	mov eax, [abData + 1] ; 1 - dd - Data
1657
1658	ret
1659
1660	ENDPROC vgdrvFindAdapter
1661
1662
1663
1664	;;
1665	; This must be present
1666	segment DATA32
1667	g_pfnDos16Write:
1668	dd DOS16WRITE ; flat
1669

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source: vbox/trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuestA-os2.asm@ 78376

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