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airboot.asm@ 184

Last change on this file since 184 was 184, checked in by Ben Rietbroek, 8 years ago

Added 'CRC_IGNORE' option for debug building [v1.1.1-testing]

The CRC is calculated and inserted in the loader image when AiR-BOOT is
installed. Ignoring the CRC enables manually merging the loader without
using the installer. This is used for debugging in virtual machines,
where it is easy to merge the loader to the disk image of the VM.

CAUTION:
This is a testbuild !
AirBoot uses the BIOS to access disks and a small coding error can trash
partition tables or other vital disk structures. You are advised to make
backups of TRACK0 and EBRs before using this testbuild. More info at:
https://rousseaux.github.io/netlabs.air-boot/pdf/AirBoot-v1.1.0-manual.pdf

File size: 99.4 KB

Line
1	;
2	; AiR-BOOT (c) Copyright 1998-2008 M. Kiewitz
3	;
4	; This file is part of AiR-BOOT
5	;
6	; AiR-BOOT is free software: you can redistribute it and/or modify it under
7	; the terms of the GNU General Public License as published by the Free
8	; Software Foundation, either version 3 of the License, or (at your option)
9	; any later version.
10	;
11	; AiR-BOOT is distributed in the hope that it will be useful, but WITHOUT ANY
12	; WARRANTY: without even the implied warranty of MERCHANTABILITY or FITNESS
13	; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
14	; details.
15	;
16	; You should have received a copy of the GNU General Public License along with
17	; AiR-BOOT. If not, see <http://www.gnu.org/licenses/>.
18	;
19
20
21
22
23
24
25
26	;##############################################################################
27	; AiR-BOOT / DEFINITIONS
28	;##############################################################################
29
30	;
31	; Include AiR-BOOT Version Information.
32	; This version-info is defined using simpel EQU's so it can serve as a
33	; single source for other formats. The AiR-BOOT signature and the
34	; OS/2 BLDLEVEL use this basic version information.
35	;
36	include ../include/version.inc
37
38	;
39	; Include OS/2 BLDLEVEL Information.
40	; It uses the version-information in VERSION.INC to build it's signature.
41	;
42	include bldlevel.inc
43
44	;
45	; Include some macro's.
46	; This file contains the ORIGIN macro that is used to detect overlaps.
47	;
48	include ../include/asm.inc
49
50
51	; We actually don't want to use this directive because it generates extra
52	; NOP instructions that we can do without.
53	; TASM also has a bug in that when the .ERR2 directive is used when
54	; the .386 directive is in effect, the JUMPS directive is also active
55	; and cannot be turned off.
56	; NOJUMPS seems to have no effect in this situation.
57	; In this case 4 NOP instructions are generated after forward referencing jump
58	; instructions, to allow for automatic recoding by TASM.
59	; This seems to be a TASM bug. (v2,v3,v4, dunno v5)
60	IFDEF TASM
61	;~ JUMPS
62	ENDIF
63
64
65	;
66	; If defined then each module is prefixed with it's name.
67	; This is used for debugging purposes but it also increases code space.
68	; It should be off in release code.
69	;
70	;~ MODULE_NAMES EQU
71
72
73
74	; -----------------------------------------------------------------------------
75	; DEBUG
76	; -----------------------------------------------------------------------------
77
78	;
79	; Enable this to include Debug Modules and enable COM-port debugging.
80	; To have room for the debug-code, the FX-code can only be enabled
81	; when AUX_DEBUG is not defined.
82	;
83	;~ AUX_DEBUG EQU
84
85	;
86	; To have FX enabled, make sure FX_ENABLE is defined.
87	; There is no need (for now) to remove Cooper Bars from the setup-menu
88	; because AiR-BOOT does not crash when enabling Cooper Bars while FX
89	; is not compiled in. Only TAB to post-screen does not work.
90	; Way to go Martin !
91	;
92	IFNDEF AUX_DEBUG
93	FX_ENABLED EQU
94	ENDIF
95
96
97
98	; -----------------------------------------------------------------------------
99	; AUX
100	; -----------------------------------------------------------------------------
101	;
102	; bits 7-5 = datarate
103	; (000=110,001=150,010=300,011=600,100=1200,101=2400,110=4800,111=9600 bps)
104	; bits 4-3 = parity
105	; (00 or 10 = none, 01 = odd, 11 = even)
106	; bit 2 = stop-bits
107	; (set = 2 stop-bits, clear = 1 stop-bit)
108	; bits 1-0 = data-bits
109	; (00 = 5, 01 = 6, 10 = 7, 11 = 8)
110	;
111
112	; 9600 bps, no parity, 1 stop-bit, 8 bits per char
113	AUX_INIT_PARMS EQU 11100011b
114
115	; Com-port for debugging, 0 is disabled
116	BIOS_COM_PORT EQU 1
117
118	; Default word value for BIOS_AuxParms variable
119	; Note that is has moved since v1.07
120	BIOS_AUXPARMS_DEFAULT EQU (AUX_INIT_PARMS SHL 8) OR BIOS_COM_PORT
121
122	; Default byte value for BIOS_BootDisk variable
123	BIOS_BOOTDISK_DEFAULT EQU 80h
124
125
126
127	; -----------------------------------------------------------------------------
128	; LABELS
129	; -----------------------------------------------------------------------------
130	; Address labels after code-move
131	BootBaseSeg equ 08000h ; Pre-boot, in the low 640K
132	BootBasePtr equ 0h ; We put our MBR to this location
133	BootBaseExec equ BootBasePtr+offset MBR_RealStart
134	StackSeg equ 07000h ; Put the stack below the code
135	StartBaseSeg equ 00000h ; Pre-boot, we are in low memory
136	StartBasePtr equ 07C00h ; BIOS starts our MBR at 0:7C00
137
138
139
140	; -----------------------------------------------------------------------------
141	; VIDEO
142	; -----------------------------------------------------------------------------
143	; Video pages, no INT 10h is used for menu-drawing etc.
144	VideoIO_Page0 equ 0B800h
145	VideoIO_Page1 equ 0B900h
146	VideoIO_Page2 equ 0BA00h
147	VideoIO_Page4 equ 0BC00h
148	VideoIO_FXSegment equ 0A000h
149
150	; Special line-drawing characters
151	TextChar_WinLineRight equ 0C4h
152	TextChar_WinLineDown equ 0B3h
153	TextChar_WinRep1 equ 0D1h
154	TextChar_WinRep2 equ 0C5h
155	TextChar_WinRep3 equ 0CFh
156	TextChar_WinRep4 equ 0B5h
157	TextChar_WinRep5 equ 0C6h
158	TextChar_WinRep6 equ 0D8h
159
160
161	; -----------------------------------------------------------------------------
162	; DISK INFORMATION
163	; -----------------------------------------------------------------------------
164	; Offsets into the DISKINFO structures located in the array [DiskInformation]
165
166	; BIOS disk number and MBR flags
167	LocDISKINFO_DiskNum equ 00h ; BYTE - BIOS disk number (80h etc)
168	LocDISKINFO_MbrFlags equ 01h ; BYTE - Valid MBR, etc
169
170	; BIOS INT13 Info
171	LocDISKINFO_I13_Secs equ 02h ; WORD - Max 63
172	LocDISKINFO_I13_Heads equ 04h ; WORD - Max 16 or 255
173	LocDISKINFO_I13_Cyls equ 06h ; WORD - Max 1024
174
175	; BIOS INT13X Info
176	LocDISKINFO_I13X_Flags equ 08h ; WORD - CHS valid, etc
177	LocDISKINFO_I13X_SecSize equ 0ah ; WORD - Normally 512 bytes
178	LocDISKINFO_I13X_Secs equ 0ch ; DWORD - Max 63 ?
179	LocDISKINFO_I13X_Heads equ 10h ; DWORD - Max 255 ?
180	LocDISKINFO_I13X_Cyls equ 14h ; DWORD - Max 2_32 (4294967296)
181	LocDISKINFO_I13X_SecsLBA equ 18h ; QWORD - Max 2^64 (4294967296^2)
182	LocDISKINFO_I13X_HostBus equ 20h ; 4 bytes
183	LocDISKINFO_I13X_Interface equ 24h ; 8 bytes
184
185	; OS/2 LVM Info
186	LocDISKINFO_LVM_Flags equ 2ch ; WORD - OS/2 ext geo, etc
187	LocDISKINFO_LVM_MasterLBA equ 2eh ; DWORD - Max 254
188	LocDISKINFO_LVM_Secs equ 32h ; DWORD - Max 255
189	LocDISKINFO_LVM_Heads equ 36h ; DWORD - Max 255
190	LocDISKINFO_LVM_Cyls equ 3ah ; DWORD - Max 65536
191
192	; Custom Info
193	LocDISKINFO_Flags equ 3eh ; WORD - Custom flags, dunno yet
194
195	; Size of this structure
196	DISKINFO_Size equ 40h ; Size to be allocated
197
198
199	; -----------------------------------------------------------------------------
200	; PARTITION TABLE
201	; -----------------------------------------------------------------------------
202	; Offsets for Partition-Entries in MBR/EBRs
203	LocBRPT_LenOfEntry equ 16 ; Length of a standard MBR or EPR entry
204	LocBRPT_Flags equ 0 ; Bootable, Hidden, etc.
205	LocBRPT_BeginCHS equ 1 ; Packed CHS value
206	LocBRPT_BeginHead equ 1 ; Start head, usually < 16
207	LocBRPT_BeginSector equ 2 ; Start sector, max 63 + cyl high bits
208	LocBRPT_BeginCylinder equ 3 ; Start cylinder 8+2 bits, max 1023
209	LocBRPT_SystemID equ 4 ; Type of system using the partition
210	LocBRPT_EndCHS equ 5 ; Packed CHS value
211	LocBRPT_EndHead equ 5 ; End head, usually < 16
212	LocBRPT_EndSector equ 6 ; End sector, max 63 + cyl high bits
213	LocBRPT_EndCylinder equ 7 ; End cylinder 8+2 bits, max 1023
214	LocBRPT_RelativeBegin equ 8 ; LBA32 address of partition
215	LocBRPT_AbsoluteLength equ 12 ; 32-bit length of partition
216
217	; Signature relative to start of MBR/EBR
218	LocBR_Magic equ 510 ; Offset of 0AA55h signature
219
220
221	; -----------------------------------------------------------------------------
222	; LVM RECORD
223	; -----------------------------------------------------------------------------
224	; Used as a quick compare in LVM.ASM
225	LocLVM_SignatureByte0 equ 02h
226
227	; Offsets for LVM Information Sector.
228	; These are relative to the start of the LVM sector.
229	LocLVM_SignatureStart equ 00h ; 02h,'RMBPMFD' (8 bytes)
230	LocLVM_CRC equ 08h ; CRC is a DWORD
231	LocLVM_Heads equ 1ch ; Number of heads
232	LocLVM_Secs equ 20h ; Sectors per Track
233	LocLVM_DiskName equ 24h ; Name of the disk
234	LocLVM_StartOfEntries equ 3ch ; (contains maximum of 4 entries)
235	LocLVM_LenOfEntry equ 3ch ; Length of an LVM-entry
236
237	; An LVM info-sector can contain information on max. 4 partitions.
238	; All 4 entries will be used when there 4 primary partitions defined.
239	; For logical partitions, the LVM info-sector is located below the start
240	; of the logical partition and only one LVM entry is used in that logical
241	; LVM info-sector.
242	LocLVM_MaxEntries equ 4 ; Max entries in an LVM-sector
243
244
245	; -----------------------------------------------------------------------------
246	; LVM ENTRY
247	; -----------------------------------------------------------------------------
248	; Offsets for LVM entry.
249	; These are relative to the start of the entry.
250	LocLVM_VolumeID equ 00h ; DWORD
251	LocLVM_PartitionID equ 04h ; DWORD
252	LocLVM_PartitionSize equ 08h ; DWORD
253	LocLVM_PartitionStart equ 0ch ; DWORD
254	LocLVM_OnBootMenu equ 10h ; is on IBM BM Bootmenu
255	LocLVM_Startable equ 11h ; is Startable (newly installed system)
256	LocLVM_VolumeLetter equ 12h ; Drive Letter for partition (C-Z or 0)
257	LocLVM_Unknown equ 13h ; unknown BYTE (can be used ?)
258	LocLVM_InstallLetter equ 13h ; unknown BYTE (can be used ?)
259
260	; Truncated to 11 chars when displayed in menu.
261	; MiniLVM sets both to the same value.
262	; Also, MiniLVM uses a 0-byte terminator, so the maximum length is 19d.
263	; Same goes for LocLVM_DiskName.
264	; These offsets are relative to an LVM entry.
265	LocLVM_VolumeName equ 14h ; 20 bytes
266	LocLVM_PartitionName equ 28h ; 20 bytes (Used in menu)
267
268	; LVM constants.
269	LocLVM_LabelLen equ 14h ; Length of LVM Label (Disk/Part/Vol)
270	LocLVM_DiskNameLen equ 14h ; Length of LVM DiskName
271	LocLVM_VolumeNameLen equ 14h ; Length of LVM VolumeName
272	LocLVM_PartitionNameLen equ 14h ; Length of LVM PartitionName
273
274
275	; -----------------------------------------------------------------------------
276	; AiR-BOOT IPT
277	; -----------------------------------------------------------------------------
278	; Offsets for IPT (Internal Partition Table)
279	LocIPT_MaxPartitions equ max_partitions ; 45 in v1.07+
280	LocIPT_LenOfSizeElement equ 6 ; Size of one Size-Element
281	LocIPT_LenOfIPT equ 34 ; Length of an IPT-entry
282	LocIPT_Serial equ 0 ; Serial from MBR ?
283	LocIPT_Name equ 4 ; Name from FS or LVM (part/vol)
284	LocIPT_Drive equ 15 ; Drive-ID (80h,81h)
285	LocIPT_SystemID equ 16 ; Partition-Type (06,07,etc)
286	LocIPT_Flags equ 17 ; AiR-BOOT Flags for part (see below)
287	LocIPT_BootRecordCRC equ 18 ; CRC of Boot-Record
288	LocIPT_LocationBegin equ 20 ; Begin of Partition
289	LocIPT_LocationPartTable equ 23 ; PartitionTable of Partition
290	LocIPT_AbsoluteBegin equ 26 ; Absolute Sector of Begin
291	LocIPT_AbsolutePartTable equ 30 ; Absolute Sector of PartTable
292
293
294	; AiR-BOOT IPT-Flags
295	LocIPT_DefaultFlags equ 00000011b ; Don't know if boot-able :)
296	LocIPT_DefaultNonBootFlags equ 00000010b ; VIBR Detection is always on
297
298	Flags_Bootable equ 00000001b
299	Flags_VIBR_Detection equ 00000010b
300	Flags_HideFeature equ 00000100b
301	Flags_DriveLetter equ 00001000b ; OS/2 FAT16/HPFS only
302	Flags_ExtPartMShack equ 00010000b ; Ext. Partition M$-Hack req ?
303	Flags_NoPartName equ 01000000b
304	Flags_NowFound equ 10000000b ; temp only in OldPartTable
305	Flags_SpecialMarker equ 10000000b ; temp only for HiddenSetup
306
307	FileSysFlags_BootAble equ 00000001b ; Is this Partition boot-able ?
308	FileSysFlags_FAT32 equ 00010000b ; FAT 32 specific name getting
309	FileSysFlags_NoName equ 00100000b ; No Name - use PartitionName
310	FileSysFlags_DriveLetter equ 01000000b ; DriveLetter Feature possible
311
312
313	; -----------------------------------------------------------------------------
314	; AiR-BOOT HPT
315	; -----------------------------------------------------------------------------
316	; Hidden Partition Table
317	; Length of an HPT-entry ((45 * 6 bits-per-part) / 8) * 45
318	; 33.75 = 34 bytes for HPT-entry, coincidently same as length of IPT-entry.
319	; Packed table !
320	LocHPT_LenOfHPT equ 34
321
322
323	; -----------------------------------------------------------------------------
324	; NAVIGATION KEYS
325	; -----------------------------------------------------------------------------
326	; Navigation keys
327	Keys_Up equ 48h
328	Keys_Down equ 50h
329	Keys_Left equ 4Bh
330	Keys_Right equ 4Dh
331	Keys_PageUp equ 49h
332	Keys_PageDown equ 51h
333	Keys_GrayPlus equ 4Eh
334	Keys_GrayMinus equ 4Ah
335	Keys_Plus equ 1Bh
336	Keys_Minus equ 35h
337	Keys_ENTER equ 1Ch
338	Keys_ESC equ 1h
339	Keys_F1 equ 3Bh
340	Keys_F10 equ 44h
341	Keys_C equ 2Eh ; Add. Check for Ctrl!
342	Keys_Y equ 2Ch
343	Keys_Z equ 15h
344	Keys_N equ 31h
345	Keys_TAB equ 0Fh
346	Keys_Delete equ 53h
347	Keys_Backspace equ 0Eh
348	Keys_Space equ 20h
349
350	Keys_Flags_EnterSetup equ 1100b ; Strg+Alt (AL)
351
352
353	; -----------------------------------------------------------------------------
354	; MISC
355	; -----------------------------------------------------------------------------
356	; Initial value for the FreeDriveletterMap
357	; Meaning A,B not free; C-Z free, rest unused. (right to left)
358	; Each partition with an assigned drive-letter clears a bit in this map.
359	; (Not implemented yet)
360	InitialFreeDriveletterMap equ 00000011111111111111111111111100b
361
362	;
363	; The first harddisk is BIOS coded 80h.
364	; This makes a total of 128 disks that could be supported using this coding.
365	; This value is used to store disk-information and this info is allocated
366	; in the BSS. 64 disks ought to be enough for everybody :-)
367	;
368	MaxDisks equ 64
369
370
371
372
373
374
375	;##############################################################################
376	; AiR-BOOT / MAIN-CODE
377	;##############################################################################
378
379	;
380	; Because of the TASM-bug the processor had to be changed to turn JUMPS
381	; off. Existing movzx instructions were replaced with 286 equivalent code.
382	; Out of range relative jumps have been recoded.
383	;
384	; Since version 1.0.8, JWasm is the preferred assembler and Tasm will be
385	; dropped. Also, the chances of AiR-BOOT being used on a 286-machine are
386	; very slim, so a future version will revert back to .386 and also incorporate
387	; 32-bit code. This will enable some enhanced constructs such as scaled
388	; indexing, bit-instructions, 32-bit registers and what not.
389	;
390	.286
391
392	;
393	; For Tasm, MODEL is needed for the USES directive to work.
394	; So always use a model when assembling with Tasm otherwise registers on
395	; function calls that use USES are not saved and restored.
396	; The model itself, has no real effect because we generate a binary image
397	; and not a segmented executable.
398	; For the other assemblers we define no model to get rid of the default C/C++
399	; segments for future object-linked versions of AiR-BOOT.
400	;
401	IFDEF TASM
402	;~ .model large, basic
403	.model tiny,c
404	ENDIF
405
406	;
407	; The below is used to switch between the original 1-segment (code_seg) layout
408	; and the new 2-segment (code_seg and bss_data) layout.
409	; It will be removed in future versions.
410	; The 2-segment layout was needed for JWasm because it does not treat
411	; db ? at the end of a code segment as bss-data.
412	; Therefore, a true BSS segment is now used.
413	; Both the code_seg and the bss_data are grouped to the logical AIRBOOT
414	; segment.
415	; Note that this influences the offsets in the BSS in the list-file and
416	; the wdis disassembly file (.WDA).
417	; They are now segment-relative. The true offset is resolved at link
418	; time.
419	;
420	SEGMENTED EQU
421
422	IFDEF SEGMENTED
423	AIRBOOT GROUP LDRIMAGE,VOLATILE
424	ENDIF
425
426	; Our code-segment starts here.
427	LDRIMAGE SEGMENT USE16 PUBLIC 'CODE'
428
429	IFDEF SEGMENTED
430	ASSUME CS:AIRBOOT, DS:AIRBOOT, ES:nothing, SS:nothing
431	ELSE
432	ASSUME CS:LDRIMAGE,DS:LDRIMAGE,ES:nothing, SS:nothing
433	ENDIF
434
435
436
437	;==============================================================================
438	; Sector 1
439	;==============================================================================
440
441	;------------------------------------------------------------------------------
442	; We are not a .COM file at 100h but a BINARY image
443	; of which only the 1st sector gets loaded at 0000:07c00h
444	; by the BIOS. The code in this 1st sector is position
445	; independent and moves itself to a new location at 8000:0000h.
446	; Then it jumps to a new entry-point and loads the rest of
447	; the image to the new location.
448	org 00000h
449	;------------------------------------------------------------------------------
450
451
452	;
453	; Since AiR-BOOT is a boot-loader residing in track0, the first 512 bytes
454	; have the layout of a Master Boot Record (MBR). When AiR-BOOT get's installed,
455	; the first 512 bytes of this code get's merged with the Partition Table.
456	; The rest is installed in the remaining sectors with sector 62 (LBA 61)
457	; being the last sector used by AiR-BOOT. Sector 63 is reserved for IBM LVM.
458	; The last sector used by AiR-BOOT is a copy of the MBR that AiR-BOOT makes
459	; every time a system gets booted.
460	;
461
462	;
463	; Due to the addition of an extra 'I13X' sugnature and code to preserve the
464	; values of the registers on entry, the MBR-code has become a bit messy.
465	; This will be cleaned-up in future versions.
466	;
467
468	;
469	; Martin had a short jump followed by the AiRBOOT signature at first.
470	; Then he encountered strange behaviour by some M$ operating-systems
471	; if the the first insruction was not a CLI.
472	; But there was no room to insert the CLI and of course he did not want to
473	; change the location of the AiR-BOOT signature.
474	; He solved this by inserting the M$ needed CLI at offset 0 followed by a short
475	; jump that uses the 'A' of the AiR-BOOT signature as the jump displacement.
476	;
477
478
479	; -----------------------------------------------------------------------------
480	; FIRST ENTRY-POINT
481	; -----------------------------------------------------------------------------
482	; BOOKMARK: FIRST ENTRY-POINT (Invoked by BIOS)
483	; ######################################################
484	; # ENTRY-POINT WHERE THE BIOS TRANSFERS CONTROL TO US #
485	; ######################################################
486	AiR_BOOT:
487	; Some M$ operating systems need a CLI
488	; here otherwise they will go beserk
489	; and will do funny things during
490	; boot phase, it's laughable!
491	MBR_1stOpc: cli
492
493	; JMP-Short -> MBR_Start
494	; Uses the 'A' from the signature as the displacement !
495	MBR_JmpOpc db 0EBh
496
497	; ID String, Date (DD,MM,CC,YY), Version Number, Language ID
498	;~ db 'AiRBOOT',24h,02h,20h,12h,01h,08h,TXT_LanguageID
499	MBR_ABSig: InsertAirbootSignature TXT_LanguageID
500
501	; Total Code Sectors Count.
502	; Actual value will be inserted by FIXCODE.
503	MBR_CodeSecs db 1
504
505	; Total Code Sectors Count, dynamically calculated.
506	;~ db (code_end-$)/512
507
508	; Check-Sum for Code
509	MBR_CheckCode dw 0
510
511
512
513	; -----------------------------------------------------------------------------
514	; THIRD ENTRY-POINT
515	; -----------------------------------------------------------------------------
516	; BOOKMARK: THIRD ENTRY-POINT (Relocate code)
517	;
518	; No single instruction below should be changed, added or removed in the code
519	; below as this will cause the jump-link to go haywire.
520	;
521	MBR_Start:
522	;
523	; When we arrive here, no registers have been used yet.
524	; So, they still contain the values the BIOS left in them.
525	; We want to preserve those value's for later inspection
526	; by putting them on the stack.
527	;
528
529	; No space for this instruction here.
530	; We'll enable interrupts later.
531	;sti ; This opcode is dedicated to:
532	; =MICROSOFT JUMP DEPARTMENT=
533
534	; Push all registers with values provided by the BIOS
535	; on the stack.
536	pusha
537
538	;
539	; Setup some base stuff
540	; AX got loaded wrongly for debug, changed the instructions
541	; without modifying the number of bytes.
542	; Don't comment-out the redundant instruction below because it
543	; will change the number of bytes and break the jump-chain.
544	;
545
546	; The segment we are moving ourself from (NOT USED)
547	;mov ax, StartBaseSeg
548	;mov ds, ax
549
550	; Make sure DS points to CS.
551	push cs
552	pop ds
553
554	; Setup the source and destination for the code move.
555	mov si, StartBasePtr ; The offset we move ourself from
556	mov ax, BootBaseSeg ; The target segment we move to
557	mov es, ax
558	;mov di, BootBasePtr ; The target offset we move to
559	; Changed the instruction to make room.
560	; So, BootBasePtr is not used !
561	; The offset in the target segment is assumed to be 0000
562	; anyway.
563	xor di,di
564	;sti
565
566	; Size of the MBR in words.
567	mov cx, 256 ; Pre-boot environment
568
569	;
570	; This moves this 512-byte sector, loaded by the BIOS at
571	; 0000:7c00 to 8000:0000.
572	;
573	cld
574	rep movsw
575
576	; Temporary save SS and SP so we still have access to this
577	; stack after we have setup our own.
578	mov cx,ss
579	mov bx,sp
580
581	; Code an intersegment jump to the new location.
582	; jmp BootBaseSeg:BootBaseExec
583	; Note that DX:BX containts the old SS:SP.
584	db 0EAh
585	dw BootBaseExec ; This is MBR_RealStart + BootBasePtr
586	dw BootBaseSeg ; This is 08000h
587
588
589
590
591	; -----------------------------------------------------------------------------
592	; SIMPLE MBR FUNCTIONS
593	; -----------------------------------------------------------------------------
594	;
595	; Some MBR-functions to provide absolute minimum functionality.
596	;
597
598	;
599	; BOOKMARK: Halt System
600	; Entry-point for halting the system.
601	;
602	MBR_HaltSystem:
603	mov ax, 8600h
604	xor cx, cx
605	mov dx, 500
606	int 15h ; Wait to display the whole screen :]
607	MBR_HaltSys:
608	;~ cli
609	jmp MBR_HaltSys
610
611
612	; Base of some MBR variables
613	ORIGIN 0003Ch
614
615	MBR_Variables:
616
617	; Comport settings.
618	; It had to be moved to create room for the double I13X signature.
619	; It cannot be in the config-area (sector 55)
620	; because that area is crc-protected and would not allow 'poking'.
621	BIOS_AuxParms dw BIOS_AUXPARMS_DEFAULT
622
623	; When the BIOS turns over control to the MBR, DL holds the BIOS disk-number
624	; from which the boot was initiated. This would normally be 80h, corresponding
625	; to the first physical disk. However, some modern BIOSses can directly boot
626	; from other disks, so AirBoot cannot assume being loaded from 80h anymore.
627	; So here we store the BIOS disk-number passed in DL when AirBoot got control.
628	BIOS_BootDisk db BIOS_BOOTDISK_DEFAULT ; Get overwritten with 'DL'
629
630	; Reserved space for future variables.
631	IFDEF AUX_DEBUG
632	reserved db 5 dup('X')
633	ELSE
634	reserved db 5 dup(0)
635	ENDIF
636
637
638
639
640	; -----------------------------------------------------------------------------
641	; SECOND ENTRY-POINT
642	; -----------------------------------------------------------------------------
643
644	;
645	; We arrive here after the first jump using the 'A' of the
646	; AiR-BOOT signature. So we ensure the jump is always at
647	; this offset. We jump here, because Martin needed to
648	; insert a CLI on start and did not want to change the
649	; AiR-BOOT signature because of Microsoft inventions...
650	;
651	ORIGIN 00044h
652
653	; Jump again...
654	; This time to the code that relocates to 8000:0000.
655	; BOOKMARK: SECOND ENTRY_POINT (Skipped over AB signature)
656	jmp MBR_Start
657
658	;
659	; Entry-point when loading fails.
660	;
661	db 'LOAD ERROR!', 0
662	MBR_LoadError Proc Near
663	mov si, offset $-12
664	push cs
665	pop ds
666	call MBR_Teletype
667	MBRLE_Halt:
668	jmp MBRLE_Halt
669	MBR_LoadError EndP
670
671	;
672	; Entry-point when saving fails.
673	;
674	db 'SAVE ERROR!', 0
675	MBR_SaveError Proc Near
676	mov si, offset $-12
677	push cs
678	pop ds
679	call MBR_Teletype
680	MBRSE_Halt:
681	jmp MBRSE_Halt
682	MBR_SaveError EndP
683
684
685	; Put text on the screen using the BIOS tele-type function.
686	; No attributes like color are supported.
687	; In: SI - Pointer to begin of string (EOS is 0)
688	; Destroyed: SI
689	MBR_Teletype Proc Near Uses ax bx cx
690	mov ah, 0Eh
691	mov bx, 7
692	MBRT_Loop:
693	lodsb
694	or al, al
695	jz MBRT_End
696	int 10h
697	jmp MBRT_Loop
698	MBRT_End:
699	ret
700	MBR_Teletype EndP
701
702	;
703	; Rousseau: DO NOT ADD CODE TO THIS SECTION !
704	;
705
706	; In: BX - Base Check
707	; DS:SI - Pointer to 512-byte-area to be included
708	; Out: BX - Base Check Result
709	; Destroyed: SI will get updated (+512)
710	MBR_GetCheckOfSector Proc Near Uses ax cx
711	mov cx, 256
712	MBRGCOS_Loop:
713	lodsw
714	xor ax, 0BABEh
715	xor bx, ax
716	loop MBRGCOS_Loop
717	or bx, bx
718	jnz MBRGCOS_NoFixUp
719	mov bx, 1 ; dont allow 0, cause 0 == empty
720	MBRGCOS_NoFixUp:
721	ret
722	MBR_GetCheckOfSector EndP
723
724
725
726
727
728
729	; -----------------------------------------------------------------------------
730	; ENTRY-POINT OF MOVED CODE
731	; -----------------------------------------------------------------------------
732
733	;
734	; When we arrive here we are running at 8000:0000.
735	; CX:BX contains the SS:SP of the old stack.
736	;
737
738	;
739	; This is where the rest of AiR-BOOT gets loaded from track0.
740	;
741	; BOOKMARK: Running at relocated position (Load additional sectors)
742	;------------------------------------------------------------------------------
743	MBR_RealStart:
744	;
745	; Setup new stack and other segment registers.
746	;
747	mov ax, StackSeg ; 07000h, below the moved code
748	mov ss, ax
749	mov sp, 7FFEh ; Even is better
750	push es ; ES holds segment where we moved to
751	pop ds ; Set DS=ES to Code Segment
752
753	;
754	; Push the old SS:SP which was saved in CX:BX on the new stack.
755	;
756	push cx ; Old SS
757	push bx ; Old SP
758
759	;
760	; Store the BIOS disk-number AirBoot was loaded from.
761	;
762	mov [BIOS_BootDisk], dl
763
764	; Load the configuration-sectors from disk.
765	; These are the main configuration sector and the various
766	; tables that follow it upto but not including the MBR backup.
767	mov bx, offset Configuration ; Location in RAM
768	mov cx, 0037h ; Config sector is at 55d
769	mov al, (MBR_BackUpMBR - Configuration) / 200h
770	mov ah, 02h
771	; DL is already loaded with BIOS disk-number
772	int 13h ; Call BIOS service
773	jnc MBR_ConfigCopy_NoError
774
775	; Some error occured
776	MBR_ConfigCopy_LoadError:
777	jmp MBR_LoadError ; Will Abort BootUp
778
779	; Load the code-sectors from disk.
780	; [MBR_CodeSecs] is filled in by the FIXCODE helper that post
781	; processes the AIRBOOT loader image after it has been built.
782	MBR_ConfigCopy_NoError:
783	mov bx, offset FurtherMoreLoad ; Directly after MBR
784	mov cx, 0002h ; Start at 2nd sector
785	mov al, [MBR_CodeSecs] ; Number of code sectors
786	mov ah, 02h ; Read sectors
787	; DL is already loaded with BIOS disk-number
788	int 13h ; Call BIOS service
789	jnc MBR_RealStart_NoError
790
791	; Some error occured
792	jmp MBR_LoadError ; Will Abort BootUp
793
794
795	; I13X Signatures
796	ORIGIN 000d0h
797
798	; [v1.05+]
799	; Signature for IBM's LVM to detect our "powerful" features ;)
800	;
801	; [v1.0.8+]
802	; Reworked MBR code to be able to create a
803	; double 'I13X' signature.
804	; MBR's created with LVM eCS v1.x have the signature at 0d5h
805	; MBR's created with LVM eCS v2.x have the signature at 0d0h
806	; See eCS bugtracker issue #3002
807	;
808	; Update: These are actually MOV EAX,'X31I' instructions
809	; in the eCS LVM MBR-code. They are at different places in
810	; the v1.x and v2.x LVM MBR-code. Other code might depend on
811	; their presence. Let's protect their location.
812	db 'I13X',0,'I13X',0
813
814
815	MBR_RealStart_NoError:
816	; Now Check Code with CheckSum
817	mov si, offset FurtherMoreLoad
818
819	;movzx cx, bptr ds:[10h]
820	mov cl, ds:[10h]
821	mov ch,0
822
823	; Claculate checksum
824	xor bx, bx
825	MBR_RealStart_CheckCodeLoop:
826	call MBR_GetCheckOfSector
827	loop MBR_RealStart_CheckCodeLoop
828
829	; Verify checksum -- EQUAL if OK
830	cmp MBR_CheckCode, bx
831
832	;
833	; The CRC is calculated and inserted in the loader image when
834	; AiR-BOOT is installed. Ignoring the CRC enables manually
835	; merging the loader without using the installer. This is used
836	; for debugging in virtual machines, where it is easy to
837	; merge the loader to the disk image of the VM.
838	;
839	IFDEF CRC_IGNORE
840	jmp MBR_RealStart_CheckSuccess ; Ignore CRC
841	ELSE
842	je MBR_RealStart_CheckSuccess ; Honor CRC -- EQ is OK
843	ENDIF
844
845	;
846	; Oops, checksum mismatch -- halt the system
847	;
848	mov si, offset TXT_ERROR_Attention
849	call MBR_Teletype
850	mov si, offset TXT_ERROR_CheckCode
851	call MBR_Teletype
852	mov si, offset TXT_ERROR_CheckFailed
853	call MBR_Teletype
854	jmp MBR_HaltSystem
855
856
857	;
858	; OK, all loading went fine so the rest of the code
859	; is present now, so we jump to it.
860	; The old SS:SP is still on the stack.
861	;
862	MBR_RealStart_CheckSuccess:
863	jmp AiR_BOOT_Start
864
865
866
867
868
869	;------------------------------------------------------------------------------
870	include text/txtmbr.asm ; All translateable Text in MBR
871	;------------------------------------------------------------------------------
872
873	; Disk Signature
874	ORIGIN 001B8h
875
876
877	; Disk Signature
878	; Note that in an LVM 2.x MBR this collides
879	; with the dummy PTE that it uses to look for IBM-BM
880	; on the second harddisk.
881	; AiR-BOOT installer will merge the field
882	; from the MBR it replaces.
883	MBR_DrvSig db 'DSIG'
884
885	; Unused word at 01BCh.
886	; An LVM 2.x MBR puts 0CC33h here.
887	; AiR-BOOT installer will merge the field
888	; from the MBR it replaces.
889	MBR_Spare dw '$$'
890
891
892	; Partition Table.
893	ORIGIN 001BEh
894
895	; The 4 entries just for show.
896	; AiR-BOOT installer will merge them from the MBR it replaces.
897	MBR_PartTable:
898	db 16 dup('0')
899	db 16 dup('1')
900	db 16 dup('2')
901	db 16 dup('3')
902
903	; Boot Sigbature
904	MBR_Sig dw 0aa55h
905
906
907
908
909
910
911
912	;==============================================================================
913	; Sector 2
914	;==============================================================================
915
916	; -----------------------------------------------------------------------------
917	; FILE-SYSTEM TABLES
918	; -----------------------------------------------------------------------------
919
920	; First sector the rest of the loader image
921	ORIGIN 00200h
922
923	;
924	; Everything beyond this point is loaded on startup
925	; and is NOT existant at first
926	;
927	FurtherMoreLoad:
928
929	;
930	; Filesystem table correlating id with name.
931	;
932
933	; first Normal-Partition-ID, Hidden-Partition-ID
934	; and Default-Partition-Flags.
935	; 01h -> Boot-Able
936	; 10h -> FAT32 - Name Getting Scheme
937	; 20h -> No Name To Get (use Partition Name from IPT)
938	; 40h -> 'L' flag possible
939	db 'AiRSYS-TABLE'
940	FileSysIDs db 01h, 11h,01h, 04h,014h,01h, 06h,016h,41h, 0Eh,00Eh,01h
941	db 07h, 17h,41h, 08h,017h,21h, 35h,035h,20h,0FCh,017h,41h
942	db 09h, 19h,11h, 0Bh,01Bh,11h, 0Ch,01Ch,11h,0EBh,0EBh,01h
943	db 63h, 63h,21h, 81h,081h,21h, 83h,083h,21h, 40h,040h,21h
944	db 0A5h,0A5h,21h,0A6h,0A6h,21h, 82h,082h,20h,0A7h,0A7h,21h
945	db 63h, 63h,21h, 4Dh,04Dh,21h, 4Eh,04Eh,21h, 4Fh,04Fh,21h
946	db 01h, 01h,01h, 01h,001h,01h, 01h,001h,01h, 01h,001h,01h
947	db 01h, 01h,01h, 01h,001h,01h, 01h,001h,01h, 01h,001h,01h
948	db 01h, 01h,01h, 01h,001h,01h, 01h,001h,01h, 01h,001h,01h
949	db 01h, 01h,01h,0FDh,0FDh,20h, 84h,084h,20h,0A0h,0A0h,20h
950	db 0Ah, 0Ah,20h,0FEh,0FEh,21h,0FFh,0FFh,21h, 00h,000h,21h
951	db 16 dup (0)
952
953	FileSysNames db 'FAT12 ', 'FAT16 ', 'FAT16Big', 'FAT16Big'
954	db 'HPFS ', 'NTFS ', 'LVM-Data', 'JFS '
955	db 'FAT32 ', 'FAT32 ', 'FAT32 ', 'BeOS '
956	db 'Unix ', 'Minix ', 'Linux ', 'Venix ' ; x row ;)
957	db 'BSD/386 ', 'OpenBSD ', 'LinuxSwp', 'NeXTSTEP'
958	db 'GNU HURD', 'QNX ', 'QNX ', 'QNX '
959	db ' ', ' ', ' ', ' '
960	db ' ', ' ', ' ', ' '
961	db ' ', ' ', ' ', ' '
962	db ' ', 'Kernel ', ' ', '0V-Award'
963	; db 'OS/2 Man', 'via BIOS', 'Floppy ', 'Unknown '
964	db 'OS2-BMGR', 'via BIOS', 'Floppy ', 'Unknown '
965	; -> 44 Partition-Types
966
967
968
969
970
971
972	;==============================================================================
973	; Sector 3
974	;==============================================================================
975
976	; -----------------------------------------------------------------------------
977	; ENTRY-POINT AFTER LOADING THE REST OF THE CODE
978	; -----------------------------------------------------------------------------
979
980	; The entry-point jumped to from the MBR code
981	ORIGIN 00400h
982
983
984	;##############################################################################
985	;# AiR_BOOT_Start :: This is where the real work begins #
986	;# -------------------------------------------------------------------------- #
987	;# At this point, all of AirBoot is loaded, including its configuration. #
988	;# First, some setup is done, which includes the initialization of variables #
989	;# in the BSS. After that, disks are scanned for partitions and the required #
990	;# house keeping is done to incorporate changes from the previous boot. Then #
991	;# the partition list is prepared and the menu is presented. #
992	;##############################################################################
993	; BOOKMARK: AiR_BOOT_Start (AiR-BOOT now completely loaded)
994	AiR_BOOT_Start:
995
996
997	;
998	; Enable interrupts.
999	;
1000	sti
1001
1002	;
1003	; Pop the old SS:SP from the stack and save it in the BSS.
1004	; Note that this is outside the normal variable area that gets cleared.
1005	; This allows AiR-BOOT to restart itself when debugging and come-up
1006	; with access to the original values of registers the BIOS passed.
1007	;
1008	pop [OldSP]
1009	pop [OldSS]
1010
1011	; Clear the BSS from its real start just upto the end of the variables.
1012	; Here 'real start' means from where the BSS begins, which is below
1013	; the point where the first variables are located. The part after
1014	; the variables is not cleared because that is where the old SS:SP is
1015	; stored, which is needed for AirBoot restarts during debugging.
1016	mov bx, offset sobss
1017	mov cx, offset EndOfVariables - offset sobss
1018	xor ax, ax
1019	call FillMemBlock
1020
1021	; Initialize the com-port for debugging
1022	IFDEF AUX_DEBUG
1023	PUSHRF
1024	; Init com-port
1025	call AuxIO_Init
1026	; Hello message
1027	mov si, offset [AuxIOHello]
1028	call AuxIO_Print
1029	; Show Build Info
1030	call AuxIO_PrintBuildInfo
1031	call AuxIO_TeletypeNL
1032	POPRF
1033	ENDIF
1034
1035	; Dump debug information
1036	IFDEF AUX_DEBUG
1037	IF 1
1038	call DEBUG_Dump1
1039	ENDIF
1040	ENDIF
1041
1042	; Verify we still got the BIOS disk in DL
1043	IFDEF AUX_DEBUG
1044	IF 1
1045	DBG_TEXT_OUT_AUX '## AiR_BOOT_Start ##'
1046	PUSHRF
1047	call DEBUG_DumpRegisters
1048	POPRF
1049	ENDIF
1050	ENDIF
1051
1052
1053	; -----------------------------------------------------------------------------
1054	; IBM-BM BOOT PREPARATION
1055	; -----------------------------------------------------------------------------
1056	;
1057	; Since v1.0.8, AiR-BOOT is able to chainload IBM-BM.
1058	; When IBM-BM resides above the 1024-cylinder limit, the 'I13X'
1059	; signature is required at 3000:0000, FS needs to contain 3000h
1060	; and the 32-bit LBA address needs to follow the 'I13X' signature.
1061	; For booting IBM-BM from the second disk, a copy of the MBR of the
1062	; first disk is also required at 0000:7E00.
1063	; This information is derived from the eCS 2.x LVM MBR.
1064	;
1065	; So, now is a good time to copy the MBR of the first disk to
1066	; 0000:7E00 in case the partition that will be started is IBM-BM.
1067	; This copy is located at 8000:0000 and DS already points to this
1068	; segment. The 'I13X' signature and FS will be setup later.
1069	;
1070	pusha ; Save all the general purpose regs
1071	push es ; We need ES too, so save its value
1072	xor ax,ax ; Segment 0000h
1073	mov es,ax ; Make ES point to it
1074	mov si,offset BootBasePtr ; Start of AiR-BOOT which has the MBR
1075	mov di,7e00h ; Destination for the MBR for IBM-BM
1076	mov cx,100h ; 256 words = 512 bytes
1077	cld ; Direction from low to high
1078	rep movsw ; Copy the 256 words of the MBR
1079	pop es ; Restore previous value of ES
1080	popa ; Restore all the general purpose regs
1081
1082
1083	; -----------------------------------------------------------------------------
1084	; PRECRAP
1085	; -----------------------------------------------------------------------------
1086
1087	;
1088	; First it clears the BSS area.
1089	; Note that the old SS:SP is stored outside this area so this
1090	; does not get lost.
1091	; Then initialize various runtime variables and structures.
1092	;
1093	; BOOKMARK: Pre Crap
1094	call PRECRAP_Main
1095	; Number of harddisks and other system-info is now known.
1096
1097	;!
1098	;! DEBUG_BLOCK
1099	;! Let's see what the BIOS supplied us with...
1100	;! Uncomment below to activate.
1101	;!
1102	IFDEF AUX_DEBUG
1103	IF 0
1104	pushf
1105	pusha
1106
1107	; Print title.
1108	mov si,offset [bios_reg]
1109	call AuxIO_Print
1110	; Save the current stack (SS:SP).
1111	mov ax,ss
1112	mov [CurrentSS],ax
1113	mov [CurrentSP],sp
1114
1115	; Restore the old stack.
1116	mov ss,[OldSS]
1117	mov sp,[OldSP]
1118
1119	; Pop the registers with the BIOS values.
1120	popa
1121	; Push them back for AiR-BOOT restart (debug mode).
1122	pusha
1123	; Dump them to the serial-port.
1124	call DEBUG_DumpRegisters
1125	; Restore the current stack.
1126	mov ax,[CurrentSS]
1127	mov ss,ax
1128	mov sp,[CurrentSP]
1129
1130	popa
1131	popf
1132	ENDIF
1133	ENDIF
1134
1135
1136
1137	; -----------------------------------------------------------------------------
1138	; UPDATE MBR
1139	; -----------------------------------------------------------------------------
1140
1141	; Write MBR back to disk to sync MBR variables.
1142	; Otherwise subsequent MBR loads will differ from the RAM stored one,
1143	; which is used by MBR protection to validate parts of the MBR.
1144	xor bx, bx ; 0000h - our load address (8000:0000)
1145	mov cx, 1 ; CHS sector 1, cylinder 0
1146	xor dh, dh ; CHS head 0
1147	mov dl, [BIOS_BootDisk] ; The disk we were loaded from
1148	mov al, 1 ; One sector to write
1149	mov ah, 03h ; BIOS write disk (legacy)
1150	int 13h ; Call BIOS
1151	sti ; Enable ints
1152	;!
1153	;! TODO: Check success
1154	;! Yes, we should check for errors here, coz it would mean AirBoot
1155	;! was loaded from a disk where the MBR cannot be written !
1156	;!
1157
1158
1159
1160	; -----------------------------------------------------------------------------
1161	; SCAN DISKS
1162	; -----------------------------------------------------------------------------
1163
1164	;!
1165	;! DEBUG_BLOCK
1166	;! Dump the registers at this point.
1167	;!
1168	IFDEF AUX_DEBUG
1169	IF 0
1170	PUSHRF
1171	call DEBUG_DumpRegisters
1172	;~ call DEBUG_DumpDriveLetters
1173	;~ call DEBUG_DumpVolumeLetters
1174	;~ call DEBUG_DumpPartitionXref
1175	POPRF
1176	ENDIF
1177	ENDIF
1178
1179
1180	;
1181	; Scan disks for information like size etc.
1182	;
1183	call DriveIO_ScanDisks
1184
1185	;!
1186	;! DEBUG_BLOCK
1187	;! Dump the registers at this point.
1188	;!
1189	IFDEF AUX_DEBUG
1190	IF 0
1191	PUSHRF
1192	call DEBUG_DumpRegisters
1193	;~ call DEBUG_DumpDriveLetters
1194	;~ call DEBUG_DumpVolumeLetters
1195	;~ call DEBUG_DumpPartitionXref
1196	POPRF
1197	ENDIF
1198	ENDIF
1199
1200
1201	; -----------------------------------------------------------------------------
1202	; SCAN FOR PARTITIONS
1203	; -----------------------------------------------------------------------------
1204
1205	;
1206	; Scan disks for partitions
1207	;
1208	call PARTSCAN_ScanForPartitions
1209
1210	;
1211	; Internal Partition Table is now populated.
1212	;
1213
1214	;!
1215	;! DEBUG_BLOCK
1216	;! Dump various tables.
1217	;!
1218	IFDEF AUX_DEBUG
1219	IF 0
1220	PUSHRF
1221	;~ call DEBUG_DumpIPT
1222	;~ call DEBUG_DumpPartitionPointers
1223	;~ call DEBUG_DumpNewPartTable
1224	;~ call DEBUG_DumpDriveLetters
1225	;~ call DEBUG_DumpDriveLetters
1226	;~ call DEBUG_DumpVolumeLetters
1227	;~ call DEBUG_DumpPartitionXref
1228	POPRF
1229	ENDIF
1230	ENDIF
1231
1232
1233	; -----------------------------------------------------------------------------
1234	; RESTORE FORCED DRIVELETTER CORRELATION [LVM]
1235	; -----------------------------------------------------------------------------
1236
1237	;
1238	; Reconnect forced drive-letters to their corresponding
1239	; partitions.
1240	;
1241	; BOOKMARK: Update Driveletters so they are in-sync again
1242	call PARTSCAN_UpdateDriveLetters
1243	; Driveletter <-> Partition correlation is now restored.
1244
1245
1246
1247	;!
1248	;! DEBUG_BLOCK
1249	;! Dump various tables.
1250	;!
1251	IFDEF AUX_DEBUG
1252	IF 0
1253	PUSHRF
1254	;~ call DEBUG_DumpIPT
1255	;~ call DEBUG_DumpPartitionPointers
1256	;~ call DEBUG_DumpNewPartTable
1257	;~ call DEBUG_DumpDriveLetters
1258	;~ call DEBUG_DumpDriveLetters
1259	;~ call DEBUG_DumpVolumeLetters
1260	;~ call DEBUG_DumpPartitionXref
1261	POPRF
1262	ENDIF
1263	ENDIF
1264
1265
1266	; -----------------------------------------------------------------------------
1267	; SHOW WE ARE ALIVE
1268	; -----------------------------------------------------------------------------
1269
1270	;
1271	; Put some info about AiR-BOOT and the system on the screen.
1272	;
1273
1274	; Display number of physical disks found
1275	IFNDEF AUX_DEBUG
1276	mov [TextPosY], 3
1277	ELSE
1278	mov [TextPosY], 4
1279	ENDIF
1280	mov [TextPosX], 0
1281	mov si, offset [DisksFound]
1282	call VideoIO_Print
1283	mov al, [TotalHarddiscs]
1284	mov [TextColorFore], 0fh
1285	call VideoIO_PrintByteDynamicNumber
1286	mov [TextColorFore], 07h
1287
1288	; Display number of partitions found
1289	inc [TextPosY]
1290	mov [TextPosX], 0
1291	mov si, offset [PartitionsFound]
1292	call VideoIO_Print
1293	mov al, [CFG_Partitions]
1294	call VideoIO_PrintByteDynamicNumber
1295
1296	; Display Phase 1 Indicator
1297	inc [TextPosY]
1298	mov [TextPosX], 0
1299	mov si, offset [Phase1]
1300	call VideoIO_Print
1301	mov si, offset [OS2_InstallVolume]
1302	mov al, [si]
1303	test al,al ; See if phase 1 is active
1304	jnz @F
1305	mov si, offset [No]
1306	@@:
1307	call VideoIO_Print
1308
1309	; Display information about the disks found
1310	call VideoIO_DisplayDiskInfo
1311
1312
1313
1314	; -----------------------------------------------------------------------------
1315	; OS/2 PHASE1 CHECK
1316	; -----------------------------------------------------------------------------
1317
1318	;
1319	; BOOKMARK: Check for OS/2 being installed
1320	; Here we check if OS/2 is being installed.
1321	; If so, we forgo the menu and directly boot it.
1322	;
1323
1324	; If the first byte of the name of the Install Volume is not 0
1325	; then we potentially have a phase1 boot.
1326	test byte ptr [OS2_InstallVolume],0ffh
1327	; Nope, so continue normally.
1328	jz MBR_Main_ContinueBoot
1329
1330	; Setup phase1.
1331	; It is still possible that a name was set for the
1332	; Install Volume that does not exist.
1333	; In that case CY will be clear and AL=0FFh.
1334	call PART_SetupPhase1
1335	; Oops, Install Volume not found, continue normally.
1336	jnc MBR_Main_ContinueBoot
1337
1338
1339	;
1340	; == Install Volume Found ==
1341	;
1342
1343
1344	;!
1345	;! DEBUG_BLOCK
1346	;! Dump various tables.
1347	;!
1348	IFDEF AUX_DEBUG
1349	IF 0
1350	PUSHRF
1351	;~ call DEBUG_DumpIPT
1352	;~ call DEBUG_DumpPartitionPointers
1353	;~ call DEBUG_DumpPartitionXref
1354	;~ call DEBUG_DumpNewPartTable
1355	;~ call DEBUG_DumpDriveLetters
1356	POPRF
1357	ENDIF
1358	ENDIF
1359
1360
1361	; BOOKMARK: Scan for Partitions (Only if OS/2 install going on)
1362	; Because one or more partitions are possibly added, the
1363	; PartitionXref table is not 'in sync' and could cause the
1364	; wrong system to be automatically booted.
1365	; So we rescan all partitions causing the PartitionXref
1366	; table to be filled with correct values so the auto-boot
1367	; from the new partition will work correctly.
1368	call PARTSCAN_ScanForPartitions
1369
1370
1371	;!
1372	;! DEBUG_BLOCK
1373	;! Dump various tables.
1374	;!
1375	IFDEF AUX_DEBUG
1376	IF 0
1377	PUSHRF
1378	;~ call DEBUG_DumpIPT
1379	;~ call DEBUG_DumpPartitionPointers
1380	;~ call DEBUG_DumpPartitionXref
1381	;~ call DEBUG_DumpNewPartTable
1382	;~ call DEBUG_DumpDriveLetters
1383	POPRF
1384	ENDIF
1385	ENDIF
1386
1387	; Setup automatic boot to forgo the Menu.
1388	; PART_SetupPhase1 has filled in the other variables.
1389	mov byte ptr [CFG_AutomaticBoot],1
1390
1391	;
1392	; At this point the AiR-BOOT configuration has been altered
1393	; to automatically boot the newly installed system without
1394	; displaying the menu.
1395	; Code further down the road will take care of that.
1396	;
1397	jmp MBR_Main_ContinueBoot
1398
1399
1400
1401
1402	;
1403	; Wether a new system is being installed or not,
1404	; booting continues here.
1405	;
1406	MBR_Main_ContinueBoot:
1407
1408	;
1409	; Inform user how to switch between post-screen and menu
1410	; by putting this info on the screen.
1411	;
1412	mov [TextPosY], 23
1413	mov [TextPosX], 0
1414	mov si, offset [TABMessage]
1415	call VideoIO_Print
1416	inc [TextPosY]
1417	mov [TextPosX], 57
1418	call MBR_TeletypeSyncPos
1419	mov si, offset [PREPMessage]
1420	call MBR_TeletypeBold
1421	mov al,30
1422	call TIMER_WaitTicCount
1423	mov cl, sizeof [PREPMessage]
1424	mov al, ' '
1425	call VideoIO_PrintSingleMultiChar
1426
1427	mov [TextPosX], 25
1428	mov si, offset [BootEndMsg2]
1429	add si, 39
1430	mov [TextColorFore], 08h
1431	call VideoIO_Print
1432
1433
1434	;
1435	; Debug stop.
1436	;
1437
1438	;
1439	; ####################### WAIT FOR KEY ########################
1440	;
1441
1442	; Wait for key so we can see debug log if ab-menu hangs.
1443	;~ xor ax, ax
1444	;~ int 16h
1445	;call SOUND_Beep
1446
1447
1448	; Copy BIOS POST to Second Page
1449	mov ax, VideoIO_Page1
1450	call VideoIO_BackUpTo
1451
1452	;call SOUND_Beep
1453
1454
1455	; BOOKMARK: Save Configuration
1456	; Save configuration so phase1 boot-through is disabled
1457	; on next boot.
1458	mov byte ptr [OS2_InstallVolume], 0
1459	call DriveIO_SaveConfiguration
1460
1461
1462
1463	;
1464	; See if setup needs to be entered.
1465	;
1466	MBR_Main_ReEnterSetup:
1467	call SETUP_CheckEnterSETUP
1468
1469	;
1470	; Do some post processing.
1471	;
1472	; BOOKMARK: After Crap
1473	call AFTERCRAP_Main
1474
1475	MBR_Main_ReEnterBootMenuPre:
1476	; SetUp PartitionPointers for BootMenu (filter non-bootable)
1477	call PART_CalculateMenuPartPointers
1478
1479	; ...and count that one...
1480	cmp byte ptr [PartitionPointerCount], 0
1481	jne MBR_Main_SomethingBootAble
1482	mov si, offset TXT_NoBootAble
1483	call MBR_Teletype
1484	jmp MBR_HaltSystem
1485
1486	MBR_Main_SomethingBootAble:
1487	; FixUp Values, define Timed Setup booting, etc.
1488	call PART_FixUpDefaultPartitionValues
1489
1490
1491
1492	; -------------------------------------------------- BOOT-MENU
1493	MBR_Main_ReEnterBootMenu:
1494	call BOOTMENU_ResetMenuVars ; reset has to be done
1495	test byte ptr [CFG_AutomaticBoot], 1
1496	jz MBR_Main_NoAutomaticBooting
1497
1498
1499	; ------------------------------------------ AUTOMATIC BOOTING
1500	; Select automatic partition, disable automatic booting for
1501	; next time and boot system...
1502	mov byte ptr [CFG_AutomaticBoot], 0
1503	call PASSWORD_AskSystemPwd
1504	mov al, Menu_EntryAutomatic
1505
1506	;mov al, 2
1507
1508	mov Menu_EntrySelected, al ; zero based
1509	jmp MBR_Main_NoBootMenu
1510
1511
1512	MBR_Main_NoAutomaticBooting:
1513
1514	;call SOUND_Beep
1515
1516	test byte ptr [CFG_BootMenuActive], 0FFh
1517	jnz MBR_Main_GotBootMenu
1518	; ----------------------------------------------- NO BOOT-MENU
1519	; Select default partition and boot system...
1520	call PASSWORD_AskSystemPwd
1521
1522	mov al, Menu_EntryDefault
1523	;mov al,0 ; zero based
1524	mov Menu_EntrySelected, al
1525	jmp MBR_Main_NoBootMenu
1526
1527	MBR_Main_GotBootMenu:
1528	; ------------------------------------------ BOOT-MENU VISUALS
1529
1530
1531	IFDEF FX_ENABLED
1532	call FX_StartScreen
1533	ENDIF
1534
1535	; BOOKMARK: Build Main Menu
1536	call BOOTMENU_BuildBackground
1537	call BOOTMENU_BuildMain
1538
1539	IFDEF FX_ENABLED
1540	call FX_EndScreenRight
1541	ENDIF
1542
1543	call PASSWORD_AskSystemPwd
1544	call BOOTMENU_ResetTimedBoot
1545
1546	; BOOKMARK: Display Main Menu
1547	call BOOTMENU_Execute
1548
1549	jc MBR_Main_ReEnterSetup
1550	call BOOTMENU_SetVarsAfterMenu
1551
1552	; ---------------------------------------------------- BOOTING
1553	MBR_Main_NoBootMenu:
1554
1555	IFDEF FX_ENABLED
1556	call FX_StartScreen
1557	ENDIF
1558
1559	IFDEF AUX_DEBUG
1560	IF 0
1561	DBG_TEXT_OUT_AUX 'HALTING'
1562	PUSHRF
1563	;~ call DEBUG_DumpRegisters
1564	;~ call AuxIO_DumpParagraph
1565	;~ call AuxIO_TeletypeNL
1566	@@: jmp @B
1567	POPRF
1568	ENDIF
1569	ENDIF
1570	; BOOKMARK: Display bye-screen and start selected partition
1571	call BOOTMENU_BuildGoodBye
1572
1573	IFDEF FX_ENABLED
1574	call FX_EndScreenRight
1575	ENDIF
1576
1577	call PASSWORD_AskChangeBootPwd
1578
1579	call ANTIVIR_SaveBackUpMBR
1580
1581	; Preload the selected menu-entry
1582	; However, this value will be wrong if OS/2 phase1 is
1583	; active and the installation partition is newly created.
1584	; See below for the adjustment.
1585	mov dl, byte ptr [Menu_EntrySelected]
1586
1587
1588	;
1589	; Prepare to start the partition.
1590	;
1591	jmp MBR_Main_StartPartition
1592
1593
1594
1595	; -----------------------------------------------------------------------------
1596	; START PARTITION
1597	; -----------------------------------------------------------------------------
1598
1599	MBR_Main_StartPartition:
1600
1601	IFDEF AUX_DEBUG
1602	IF 0
1603	PUSHRF
1604	;~ call DEBUG_DumpIPT
1605	;~ call DEBUG_DumpPartitionPointers
1606	;~ call DEBUG_DumpPartitionXref
1607	;~ call DEBUG_DumpNewPartTable
1608	POPRF
1609	ENDIF
1610	ENDIF
1611
1612
1613	; -------------------------------------------- START PARTITION
1614	; THIS DOES NOT RETURN !
1615	call PART_StartPartition
1616
1617
1618
1619
1620	;
1621	; This entry-point restarts AiR-BOOT almost from scratch.
1622	; It skips the movement of the MBR but otherwise it is a functional restart.
1623	; The old BIOS SS:SP where the registers on entry are stored is passed along.
1624	; This entry-point is used for debugging purposes.
1625	;
1626	; BOOKMARK: AiR-BOOT Restart (used for debugging)
1627	AirbootRestart:
1628	mov bx, [OldSP] ; Old SP when BIOS transferred control to AB
1629	mov cx, [OldSS] ; Old SS when BIOS transferred control to AB
1630	xor dh, dh ; Head 0
1631	mov dl, [BIOS_BootDisk] ; Disk AirBoot was loaded from
1632	jmp MBR_RealStart
1633
1634
1635	;
1636	; This entry-point displays a popup that the system is halted
1637	; and then halts the system.
1638	; It is entered on severe error conditions.
1639	;
1640	; BOOKMARK: Halt System
1641	HaltSystem:
1642	call VideoIO_ClearScreen
1643	mov ax,0ababh
1644	mov cx, 0C04h
1645	mov si, offset SystemHalted
1646	call SETUP_ShowErrorBox
1647	; Halt the system.
1648	jmp MBR_HaltSystem
1649
1650
1651
1652
1653
1654
1655	;
1656	; The following section includes various assembler modules
1657	; at the source level. These contain functionality for a
1658	; multitude of categories like disk-access, video-io, lvm,
1659	; debugging, etc. Later versions of AiR-BOOT will use such
1660	; modules at the object-file level so they can be shared
1661	; more easily.
1662	;
1663
1664
1665	; -----------------------------------------------------------------------------
1666	; INCLUDED FILE SECTION
1667	; -----------------------------------------------------------------------------
1668
1669	; BOOKMARK: Include Section
1670
1671	;
1672	; Include other code-modules here.
1673	;
1674
1675	b_std_txt:
1676	include regular/std_text.asm ; Standard (non-translateable text)
1677	size_std_txt = $-b_std_txt
1678
1679	b_driveio:
1680	include regular/driveio.asm ; Drive I/O, Config Load/Save
1681	size_driveio = $-b_driveio
1682
1683	b_lvm:
1684	include special/lvm.asm ; LVM-specific code
1685	size_lvm = $-b_lvm
1686
1687	b_videoio:
1688	include regular/videoio.asm ; Video I/O
1689	size_videoio = $-b_videoio
1690
1691	b_timer:
1692	include regular/timer.asm ; Timer
1693	size_timer = $-b_timer
1694
1695	b_partmain:
1696	include regular/partmain.asm ; Regular Partition Routines
1697	size_partmain = $-b_partmain
1698
1699	b_partscan:
1700	include regular/partscan.asm ; Partition Scanning
1701	size_partscan = $-b_partscan
1702
1703	b_bootmenu:
1704	include regular/bootmenu.asm ; Boot-Menu
1705	size_bootmenu = $-b_bootmenu
1706
1707	b_password:
1708	include regular/password.asm ; Password related
1709	size_password = $-b_password
1710
1711	b_other:
1712	include regular/other.asm ; Other Routines
1713	size_other = $-b_other
1714
1715	b_main:
1716	include setup/main.asm ; The whole AiR-BOOT SETUP
1717	size_main = $-b_main
1718
1719	b_math:
1720	include regular/math.asm ; Math functions (like 32-bit multiply)
1721	size_math = $-b_math
1722
1723	b_txtother:
1724	include text/txtother.asm ; All translateable Text-Strings
1725	size_txtother = $-b_txtother
1726
1727	b_txtmenus:
1728	include text/txtmenus.asm ; All translateable Menu-text
1729	size_txtmenus = $-b_txtmenus
1730
1731	b_charset:
1732	include text/charset.asm ; Special Video Charsets (if needed)
1733	size_charset = $-b_charset
1734
1735	b_conv:
1736	include regular/conv.asm ; Various conversion routines
1737	size_conv = $-b_conv
1738
1739	b_virus:
1740	include special/virus.asm ; Virus Detection / Anti-Virus
1741	size_virus = $-b_virus
1742
1743	b_billsuxx:
1744	include special/f00k/billsuxx.asm ; Extended Partition - Microsoft-Hack
1745	size_billsuxx = $-b_billsuxx
1746
1747	b_sound:
1748	include special/sound.asm ; Sound
1749	size_sound = $-b_sound
1750
1751	b_apm:
1752	include special/apm.asm ; Power Managment Support
1753	size_apm = $-b_apm
1754
1755
1756
1757	;
1758	; Cyrillic support.
1759	;
1760	IFDEF TXT_IncludeCyrillic
1761	b_ccharset:
1762	include special/charset.asm ; Charset Support (e.g. Cyrillic)
1763	size_ccharset = $-b_ccharset
1764	ENDIF
1765
1766	; Various debugging routines, uses AUXIO and CONV
1767	IFDEF AUX_DEBUG
1768	b_debug:
1769	include regular/debug.asm ; Debug module
1770	size_debug = $-b_debug
1771	b_auxio:
1772	include regular/auxio.asm ; Com-port support for debugging
1773	size_auxio = $-b_auxio
1774	ENDIF
1775
1776	;
1777	; We only include this if FX_ENABLED is defined.
1778	; FX is disabled when debugging to have more room for debug-code.
1779	; The module compiles to 50eh = 1294 bytes, so that is a lot.
1780	;
1781	IFDEF FX_ENABLED
1782	b_fx:
1783	include special/fx.asm ; l33t Cooper-Bars/Scrolling <bg>
1784	size_fx = $-b_fx
1785	ENDIF
1786
1787
1788	;
1789	; End of code marker.
1790	;
1791	; BOOKMARK: END OF CODE
1792	db 'BABE'
1793	db 'FACE'
1794
1795
1796	; -----------------------------------------------------------------------------
1797	; END OF CODE
1798	; -----------------------------------------------------------------------------
1799	code_end:
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810	; -----------------------------------------------------------------------------
1811	; BLDLEVEL INFORMATION
1812	; -----------------------------------------------------------------------------
1813
1814	; BOOKMARK: BLDLEVEL Information
1815	ORIGIN 068A0h
1816
1817	;
1818	; The space between this offset and code_end is the space
1819	; available for code.
1820	;
1821	zzz_code_space = $ - code_end
1822
1823
1824	bld_level:
1825	;
1826	; Here we insert the OS/2 BLDLEVEL Information.
1827	; It is composed of the AiR-BOOT version-info and other
1828	; information. It is unique for each release of AiR-BOOT.
1829	;
1830
1831	;
1832	; ?? When AUX_DEBUG is enabled and the above org is active,
1833	; the BLDLEVEL gets corrupted eventhough it gets inserted here
1834	; explicitly. The effect is almost like an 'OR' or a merge
1835	; with the already generated FX code.
1836	; Tasm and JWasm produce different results.
1837	; ??
1838	;
1839	InsertBuildLevel
1840
1841
1842
1843
1844
1845	;==============================================================================
1846	; Sector 53
1847	;==============================================================================
1848
1849	;
1850	; From here on, the layout of the image consists of:
1851	; - AiR-BOOT Protection Image
1852	; - AiR-BOOT Configuration
1853	; - DriveLetters
1854	; - Install Volume
1855	; - Floppy/CDROM/BIOS BOOT ENTRIES
1856	; - Internal Partition Table (IPT)
1857	; - Hidden Partition Table (HPT)
1858	; - MBR Backup
1859	;
1860
1861	;
1862	; After that, the BSS follows with several runtime
1863	; variables and structures.
1864	; The BSS is not part of the image on disk of course.
1865	;
1866
1867	; -----------------------------------------------------------------------------
1868	; PROTECTION IMAGE
1869	; -----------------------------------------------------------------------------
1870
1871	;
1872	; This is the AiR-BOOT MBR Protection Image.
1873	; The stuff generated here gets overwritten when the
1874	; MBR_PROT module, which is assembled separately,
1875	; gets binary merged.
1876	; So you won't find the string below in the generated binary.
1877	;
1878	; BOOKMARK: AiR-BOOT MBR Protection Image
1879	ORIGIN 06900h
1880
1881
1882
1883
1884	;
1885	; Hardcoded to 768 bytes (MBR_PROT.ASM)
1886	; The string below is searched for by the FIXCODE helper and must be
1887	; page (256 bytes) aligned.
1888	;
1889	; It seems to be possible to shrink the protection-image to 768 bytes.
1890	; That gives us an additional 256 bytes of code-space.
1891	; MBR-PROT.ASM,FIXCODE.C,PARTMAIN.ASM and AIR-BOOT.ASM need to be adjusted for that.
1892	; Also the granularity needs to change from 512 bytes to 256 bytes since
1893	; 6900h is not a 512-byte boundary.
1894	;
1895	; 20120908 - Done.
1896	;
1897	MBR_Protection db 'AiR-BOOT MBR-Protection Image'
1898
1899	; Just fill.
1900	;~ db 1024-($-MBR_Protection) dup('M')
1901	db 768-($-MBR_Protection) dup('M')
1902
1903
1904
1905
1906
1907
1908
1909	;==============================================================================
1910	; Sector 55
1911	;==============================================================================
1912	; -----------------------------------------------------------------------------
1913	; AiR-BOOT CONFIGURATION
1914	; -----------------------------------------------------------------------------
1915
1916	;
1917	; This section contains the AiR-BOOT configuration.
1918	; Note that it has a version that should be updated
1919	; when stuff is added.
1920	; Also add stuff to the end so that offsets of other
1921	; variables remain vaild.
1922	;
1923	; BOOKMARK: AiR-BOOT Configuration Sector
1924	ORIGIN 06C00h
1925
1926	Configuration:
1927	; This is the signature for the AiR-BOOT Configuration.
1928	; Note that this configuration section, like the code section,
1929	; is CRC protected. This means that poking values in these
1930	; sections on the disk will invalidate AiR-BOOT and cause it
1931	; to halt. This is a protection method against other software
1932	; modifying stuff in track 0.
1933	db 'AiRCFG-TABLE',0adh
1934	db 01h, 10h, 'U' ; "Compressed" ID String
1935	; Version 1.02 was for code 1.06, 1.03 was internal
1936	; and 1.04,1.05 and 1.06 do not exist.
1937	;
1938	; 1.07 was used with AB v1.07 and introduced the phase1
1939	; system-name. For the rest it is compatible with v1.02.
1940	;
1941	; 1.0.8 is introduced with AB v1.0.8 and indicates the movement
1942	; of several components and the packing of the hideparttable.
1943	; The core configuration has not changed but the generated
1944	; configuration has. The v1.0.8 installer handles upgrading.
1945	;
1946	; It has been decided that uneven minor numbers will be
1947	; test-versions. Therefore v1.0.8 has been bumbed to v1.1.0.
1948	;
1949	; It is not required for the config to have the
1950	; same version as the code, so in the future
1951	; the code version might be higher than the
1952	; config version if there are no changes to the latter.
1953	;
1954
1955	CFG_LastTimeEditLow dw 0 ; Last Time Edited Stamp (will incr every setup)
1956	CFG_LastTimeEditHi dw 0 ; second 16 bit part...
1957
1958	CFG_CheckConfig dw 0 ; Check-Sum for Configuration
1959
1960	CFG_Partitions db 0 ; Count of partitions in IPT
1961	CFG_MiscFlags db 1 ; Miscellaneous Flags (See EQUates)
1962	CFG_PartDefault db 0 ; Default-Partition (Base=0)
1963
1964	CFG_PartLast db 0 ; Which Partition was booted last time ? (Base=0)
1965	CFG_TimedBoot db 1 ; Timed Boot Enable (for REAL Enable look TimedBootEnable)
1966	CFG_TimedSecs db 15 ; Timed Boot - How Many Seconds Till Boot
1967	CFG_TimedDelay dw 123 ; Timed Boot - Delay
1968	CFG_TimedBootLast db 1 ; Timed Boot - Boot From Last Drive Booted From
1969	CFG_RememberBoot db 1 ; Remember Manual Boot Choice
1970	CFG_RememberTimed db 0 ; Remember if Timed Boot (if both disabled: Boot Default)
1971	CFG_IncludeFloppy db 1 ; Include Floppy Drives in Boot-Menu
1972	CFG_BootMenuActive db 1 ; Display Boot-Menu (if Disabled: Boot Default)
1973	; v0.29+ -> 2 - Detailed Bootmenu
1974	CFG_PartitionsDetect db 1 ; Autodetect New Partitions (Auto-Add!)
1975	CFG_PasswordSetup db 0 ; Ask Password when entering Setup
1976	CFG_PasswordSystem db 0 ; Ask Password when booting System
1977	CFG_PasswordChangeBoot db 0 ; Ask Password when changing boot partition
1978	CFG_ProtectMBR db 0 ; Protect MBR via TSR ?
1979	CFG_IgnoreWriteToMBR db 0 ; Just ignore writes to MBR, otherwise crash
1980	CFG_FloppyBootGetName db 0 ; Gets floppy name for display purposes
1981	CFG_DetectVirus db 0 ; Detect Virus ?
1982	CFG_DetectStealth db 0 ; Detect Stealth-Virus ?
1983	CFG_DetectVIBR db 0 ; Detect BootRecord-Virus ?
1984	CFG_AutoEnterSetup db 0 ; Automatic Enter Setup (first install!)
1985	CFG_MasterPassword dw 0101Fh ; Encoded Password (this is just CR)
1986	dw 07A53h
1987	dw 0E797h
1988	dw 0A896h
1989	CFG_BootPassword dw 0101Fh ; Another CR... ;-)
1990	dw 07A53h
1991	dw 0E797h
1992	dw 0A896h
1993	db 0 ; Rude-Protection - Removed since v0.28b
1994	CFG_LinuxRootPartition db 0 ; Linux Root Partition (Base=0)
1995	CFG_TimedKeyHandling db 0 ; Timed Key Handling (for Timed Boot)
1996	; 0 - Do Nothing
1997	; 1 - Reset Time
1998	; 2 - Stop Time
1999	CFG_MakeSound db 0 ; Should be clear ;)
2000	CFG_FloppyBootGetTimer db 0 ; Floppy Name will get updated every 2 secs
2001	CFG_ResumeBIOSbootSeq db 1 ; If BIOS Boot Sequence should be resumed
2002	; 0 - Disabled
2003	; 1 - CD-ROM
2004	; 2 - Network
2005	; 3 - ZIP/LS120
2006	CFG_CooperBars db 0 ; If Cooper Bars should be shown
2007	CFG_LinuxCommandLine db 75 dup (0) ; Linux Command Line
2008	CFG_LinuxKrnlPartition db 0FFh ; FAT-16 Linux Kernel Partition (Base=0)
2009	; FFh -> Disabled
2010	CFG_LinuxDefaultKernel db 'DEFAULT', 4 dup (32), 0 ; Default Kernel Name
2011	CFG_LinuxLastKernel db 11 dup (32), 0 ; Last-Booted Kernel Name
2012	CFG_ExtPartitionMShack db 0 ; Extended Partition M$-Hack Global Enable
2013	CFG_AutomaticBoot db 0 ; Automatic Booting (only one bootup)
2014	CFG_PartAutomatic db 0 ; Partition-No for automatic booting
2015	CFG_ForceLBAUsage db 1 ; LBA-BIOS-API forced on any HDD I/O
2016	CFG_IgnoreLVM db 0 ; Ignores any LVM-Information
2017
2018
2019	;
2020	; THERE IS ROOM RESERVED HERE FOR MORE VARIABLES
2021	;
2022
2023	;
2024	; Drive Letters.
2025	;
2026	; BOOKMARK: Stored Drive Letters
2027	ORIGIN 06CB0h
2028
2029
2030	; -----------------------------------------------------------------------------
2031	; DRIVE LETTERS
2032	; -----------------------------------------------------------------------------
2033
2034	;
2035	; Moved here to make room for packed hiddenparttable.
2036	; This gets filled with drive-letters that are assigned using the dl-feature.
2037	;
2038	DriveLetters db LocIPT_MaxPartitions dup (0)
2039	; Format is:
2040	;============
2041	; Drive-Letter : BYTE (80h-C:, 81h-D:)
2042	; --------------------> 1 Byte * 45
2043
2044
2045
2046	; -----------------------------------------------------------------------------
2047	; INSTALL VOLUME
2048	; -----------------------------------------------------------------------------
2049
2050	;
2051	; Allways have the name of the installation volume
2052	; at this offset.
2053	; So future config changes will not break auto-install.
2054	;
2055	; BOOKMARK: Name of OS/2 Installation Volume
2056	ORIGIN 06D00h
2057
2058	; SET(A)BOOT stores the volume name of the OS/2 system being installed here.
2059	; It is truncated to 11 chars because AiR-BOOT currently does not support
2060	; longer labelnames. The name is also capitalized.
2061	OS2_InstallVolume db 0,'NOPHASEONE' ,0
2062
2063	;
2064	; THERE IS ROOM RESERVED HERE FOR MORE VARIABLES
2065	;
2066
2067
2068	; -----------------------------------------------------------------------------
2069	; FLOPPY/CDROM/BIOS BOOT ENTRIES
2070	; -----------------------------------------------------------------------------
2071
2072	;
2073	; 06DABh - 06C00h = 01ABh = 427 bytes.
2074	; Entries allocated down from 06E00 boundary.
2075	;
2076	; BOOKMARK: Floppy/CD-ROM/BIOS Boot Entries
2077	ORIGIN 06DABh ; 427 Boundry
2078
2079	; (432 - 5 = 427)
2080	AutoDrvLetter db 0
2081	AutoDrvLetterSerial dd 0
2082
2083	; This entry is also 34 bytes long (466 - 34 = 432)
2084	BIOScontIPTentry:
2085	db 0, 0, 0, 0, ' '
2086	db 0, 0FEh, Flags_Bootable
2087	dw 0 ; No Checksum :)
2088	db 0, 1, 0
2089	db 0, 1, 0 ; Location of Partition/Boot Record
2090	dd 0, 0
2091
2092	; VIR variables are for the AiR-BOOT Anti Virus Code
2093	; Most of them are backups of Interrupt Points, so we can check, if a
2094	; stealth virus is on-line, we can intercept its call.
2095	; Normal (non stealth) virus are trapped simply by rereading the MBR sector.
2096	; If a virus is found, we will restore MBR from Sektor 60/62 and stop the
2097	; system from working, so the user has to press reset.
2098	; That's saver than a Reboot.
2099	;
2100	; If a virus is found on the partition to boot, the system will ONLY halt,
2101	; nothing more, because we can not remove it. The user shall do it :)
2102	; Those viruses are detected via a real nasty method...Checksum-Checking of the
2103	; boot-record, which is to be executed. If it does not match the one in our
2104	; internal partition table, we will stop. You may however switch this detection
2105	; off or just reset it by switching 'VIBR Detection'.
2106
2107	; 478 - 12 = 466 ; 466 Sub-Part
2108	CFG_VIR_INT08 dd 0 ; pointer to saved 08h entry point
2109	CFG_VIR_INT13 dd 0 ; pointer to saved 13h entry point
2110	CFG_VIR_INT1C dd 0 ; pointer to saved 1Ch entry point
2111
2112	; 478 Boundry (512-34)
2113	; This entry is also 34 bytes long
2114	FloppyIPTentry db 0, 0, 0, 0, 'FloppyDrive'
2115	db 0, 0FFh, Flags_Bootable
2116	dw 0 ; No Checksum :)
2117	db 0, 1, 0
2118	db 0, 1, 0 ; Location of Partition/Boot Record
2119	dd 0, 0
2120
2121
2122
2123	; -----------------------------------------------------------------------------
2124	; INTERNAL PARTITION TABLE (IPT)
2125	; -----------------------------------------------------------------------------
2126
2127	;
2128	; AiR-BOOT Internal Partition Table (IPT)
2129	;
2130	; BOOKMARK: Internal Partition Table
2131	ORIGIN % (image_size - 0a00h - (image_size - image_size_60secs))
2132
2133
2134	;
2135	; Rousseau: This is the start of the AiR-BOOT IPT
2136	;
2137	PartitionTable db (LocIPT_MaxPartitions * LocIPT_LenOfIPT) dup (0)
2138	; no-partitions detected... :]
2139	; db 1, 0, 0, 0, 'Harddisc 1'
2140	; db 0, 0FFh, Flags_BootAble
2141	; dw 0 ; No Checksum :)
2142	; db 0, 0, 1
2143	; db 0, 0, 1 ; Location of Partition/Boot Record
2144	; dd 0, 0
2145
2146	; Format is:
2147	;============
2148	; SerialNumber * 4
2149	; PartitionName * 11
2150	; Drive * 1
2151	; SystemID * 1 (means the partition type)
2152	; Flags * 1
2153	; Checksum * 2 (for virus checking)
2154	; LocationBegin * 3 (where the partition begins)
2155	; LocationPartTab * 3 (where the partition table is)
2156	; AbsoluteBegin * 4 (where the partition begins, in absolute sectors)
2157	; AbsolutePartTab * 4 (where the partition table is, in absolute sectors)
2158	; --------------------> 34 Bytes (total maximum partition-entries = 30)
2159
2160
2161
2162	; No need to check overlap here because this string will
2163	; be overwritten if the maximum partition count is reached.
2164	; So this is not a critical boundary.
2165	ORG (image_size - 600h - (image_size - image_size_60secs) / 2 - 10)
2166
2167	db 'AiRBOOTPAR' ; 1K internal partition table
2168
2169
2170
2171	; -----------------------------------------------------------------------------
2172	; HIDDEN PARTITION TABLE (HPT)
2173	; -----------------------------------------------------------------------------
2174
2175	;
2176	; Hidden Partition Table (6-bit packed as of v1.0.8)
2177	;
2178	; BOOKMARK: Hidden Partition Table (packed)
2179	ORIGIN % (image_size - 600h - (image_size - image_size_60secs) / 2)
2180
2181	HidePartitionTable db (LocIPT_MaxPartitions * LocHPT_LenOfHPT) dup (0FFh)
2182	; Format is:
2183	;============
2184	; PartitionPtr : BYTE * 30
2185	; --------------------> 30 Bytes * 45
2186
2187	;
2188	; Driveletters were here.
2189	; Moved down to make room for packed hideparttable.
2190	;
2191
2192
2193	;
2194	; End of hidden partition table.
2195	; Check overlap here for security reasons.
2196	;
2197	ORIGIN % (image_size - 200h - 5)
2198
2199	; 79fa - end of packed hide table
2200	db 'ABHID' ; 1K internal Hide-partition table
2201
2202
2203
2204
2205	;==============================================================================
2206	; Sector 62
2207	;==============================================================================
2208	; -----------------------------------------------------------------------------
2209	; MBR BACKUP
2210	; -----------------------------------------------------------------------------
2211
2212	;
2213	; AiR-BOOT MBR Backup.
2214	;
2215	; BOOKMARK: MBR Backup
2216	ORIGIN % (image_size - 200h)
2217
2218
2219	MBR_BackUpMBR db 'AiR-BOOT MBR-BackUp',\
2220	' - Just to fill this sector with something',0
2221	AirBootRocks db 'AiR-BOOT Rocks!',0
2222
2223	db (512 - ($-MBR_BackUpMBR) - 2) dup('M')
2224
2225	; End of Image signature.
2226	;
2227	ORIGIN % (image_size - 2)
2228	dw 0BABEh
2229
2230
2231	;
2232	; End of Image.
2233	;
2234	ORIGIN % (image_size)
2235	image_end:
2236
2237	;
2238	; Terminate LDRIMAGE segment.
2239	;
2240	IFDEF SEGMENTED
2241	LDRIMAGE ENDS
2242	ENDIF
2243
2244
2245
2246
2247
2248
2249
2250	;##############################################################################
2251	; BSS SEGMENT
2252	;##############################################################################
2253
2254	; BOOKMARK: BSS Segment
2255
2256	;
2257	; Open BSS segment.
2258	;
2259	IFDEF SEGMENTED
2260	VOLATILE SEGMENT USE16 PUBLIC 'BSS'
2261	ENDIF
2262
2263
2264
2265	sobss:
2266	sobss_abs = offset sobss + image_size
2267	;------------------------------------------------------------------------------
2268
2269
2270	;
2271	; This is the actual start of the BSS.
2272	; In the past however, we have had a code-loop that went out of bounds,
2273	; overwriting the start of the BSS.
2274	;
2275	; Because important runtime data is stored in the BSS, we offset it
2276	; by 400h bytes. Since the loader-image is always 62 sectors, which
2277	; makes it 7c00h in size, the runtime data starts at 8000h.
2278	; This is the 'BeginOfVariables' location.
2279	;
2280
2281
2282	;
2283	; If segmented, offsets are relative to the BSS segment.
2284	; They are resolved at link-time.
2285	; If not segmented, offsets are relative to the CODE segment.
2286	;
2287	IFDEF SEGMENTED
2288	ORG 00400h ; 7c00h + 400h = 8000h
2289	ELSE
2290	ORG 08000h ; 8000h
2291	ENDIF
2292
2293
2294	; -----------------------------------------------------------------------------
2295	; START OF BSS DATA
2296	; -----------------------------------------------------------------------------
2297	; This space actually gets initialized in PreCrap to NUL (till EndOfVariables)
2298	BeginOfVariables:
2299	BeginOfVariablesAbs = offset BeginOfVariables + image_size
2300
2301
2302	; -----------------------------------------------------------------------------
2303	; SECTOR BUFFERS
2304	; -----------------------------------------------------------------------------
2305	; BOOKMARK: Sector Buffers
2306	PartitionSector db 512 dup (?) ; Temporary Sector for Partition
2307	PBRSector db 512 dup (?) ; Temporary Sector for JFS/HPFS writeback
2308	LVMSector db 512 dup (?) ; Temporary Sector for LVM
2309	TmpSector db 512 dup (?) ; Temporary Sector
2310	Scratch db 512 dup (?) ; Scratch buffer
2311	ALIGN 16
2312
2313
2314	; -----------------------------------------------------------------------------
2315	; NEW PARTITION TABLE
2316	; -----------------------------------------------------------------------------
2317	; Everything used to build a new IPT and reference it to the old one
2318	; BOOKMARK: New Partition Table
2319	NewPartTable db 1536 dup (?) ; New Partition Table
2320	ALIGN 16
2321
2322
2323	; -----------------------------------------------------------------------------
2324	; NEW HIDE PARTITION TABLE
2325	; -----------------------------------------------------------------------------
2326	; BOOKMARK: New Hide-Partition Table
2327	NewHidePartTable db LocIPT_MaxPartitions * LocHPT_LenOfHPT dup (?)
2328	ALIGN 16
2329
2330
2331	; -----------------------------------------------------------------------------
2332	; NEW DRIVE LETTERS
2333	; -----------------------------------------------------------------------------
2334	; BOOKMARK: Logical Drive-Letters
2335	NewDriveLetters db LocIPT_MaxPartitions dup (?)
2336	ALIGN 16
2337
2338
2339	; -----------------------------------------------------------------------------
2340	; PARTITION SIZE TABLE
2341	; -----------------------------------------------------------------------------
2342	; Size-Table (6 bytes per partition)
2343	; BOOKMARK: Partition Size Table
2344	PartitionSizeTable db LocIPT_MaxPartitions * 6 dup (?)
2345	ALIGN 16
2346
2347
2348	; -----------------------------------------------------------------------------
2349	; PARTITION POINTERS
2350	; -----------------------------------------------------------------------------
2351	; Maximum is 52 word entries till now
2352	; BOOKMARK: Partition Pointers
2353	PartitionPointers dw 52 dup (?)
2354	ALIGN 16
2355
2356	; Count of total Partition Pointers
2357	PartitionPointerCount db ?
2358	ALIGN 16
2359
2360
2361	; -----------------------------------------------------------------------------
2362	; XREF TABLE
2363	; -----------------------------------------------------------------------------
2364	; X-Reference Table (holds new partnr, index is old part nr)
2365	; BOOKMARK: Xref Table
2366	PartitionXref db LocIPT_MaxPartitions dup (?)
2367	ALIGN 16
2368
2369
2370	; -----------------------------------------------------------------------------
2371	; VOLUME LETTERS
2372	; -----------------------------------------------------------------------------
2373	; Volume-Letters
2374	; 0 - no LVM support
2375	; 1 - LVM support, but no letter
2376	; 'C'-'Z' - assigned drive letter
2377	; BOOKMARK: Volume Drive Letters
2378	PartitionVolumeLetters db LocIPT_MaxPartitions dup (?)
2379	ALIGN 16
2380
2381
2382	; -----------------------------------------------------------------------------
2383	; MISC VARS AND FLAGS
2384	; -----------------------------------------------------------------------------
2385	; BOOKMARK: Misc Vars and Flags
2386	TotalHarddiscs db ? ; Total harddrives (by POST)
2387	LBASwitchTable db 128 dup (?) ; Bit 25-18 for CHS/LBA Switching
2388	NewPartitions db ? ; Freshly found partitions
2389	; Independent of SaveConfiguration
2390	TooManyPartitions db ? ; Non-zero if too many partitions found
2391
2392	VideoIO_Segment dw ? ; Segment for Video I/O
2393
2394	ExtendedAbsPos dd ? ; Extended Partition Absolute Position
2395	ExtendedAbsPosSet db ? ; If Absolute Position set
2396
2397	CurPartition_Location dw 4 dup (?) ; Where did current partition come from?
2398	CurIO_UseExtension db ? ; 1-Use INT 13h EXTENSIONS
2399	; (filled out by PreCrap)
2400	CurIO_Scanning db ? ; 1-AiR-BOOT is scanning partitions
2401	; (for detailed error message)
2402	ALIGN 16
2403
2404
2405	; -----------------------------------------------------------------------------
2406	; MENU RELATED VARS
2407	; -----------------------------------------------------------------------------
2408	Menu_EntrySelected db ? ; Which partition we boot this time...
2409	Menu_UpperPart db ? ; Which number (Base=0) is the partition upper pos
2410	Menu_AbsoluteX db ? ; Pos where Menu stuff starts
2411	Menu_TotalParts db ? ; Copy of CFG_BootParts
2412	Menu_TotalLines db ? ; Total Lines on Screen used for BootMenu
2413	Menu_EntryDefault db ? ; Default Entry in filtered View
2414	Menu_EntryLast db ? ; LastBooted Entry in filtered View
2415	Menu_EntryAutomatic db ? ; Automatic Entry in filtered View
2416	; - All adjusted to menu locations
2417	ALIGN 16
2418
2419
2420	; -----------------------------------------------------------------------------
2421	; PARTITION RELATED VARS
2422	; -----------------------------------------------------------------------------
2423	PartSetup_UpperPart db ? ; Partition-Setup (like Menu_UpperPart)
2424	PartSetup_ActivePart db ? ; Active Partition
2425	PartSetup_HiddenUpper db ? ; (like Menu_UpperPart)
2426	PartSetup_HiddenX db ? ; Pos for Hidden-Setup
2427	PartSetup_HiddenAdd db ? ; Adjust for Hidden-Setup
2428	ALIGN 16
2429
2430
2431	; -----------------------------------------------------------------------------
2432	; TIMER / SETUP RELATED VARS
2433	; -----------------------------------------------------------------------------
2434	TimedBootEnable db ? ; Local Enable/Disable for timed boot
2435	TimedTimeOut dd ? ; TimeOut Timer for TimedBoot (too much time here;)
2436	TimedSecondLeft db ? ; How many seconds are left till boom ?
2437	TimedSecondBack db ? ; To get a modification noticed
2438	TimedBootUsed db ? ; Timed Boot used for bootup ?
2439	FloppyGetNameTimer dd ? ; Timer for Floppy-Get-Name
2440	SETUP_KeysOnEntry db ? ; which Shift Status was there, when booting ?
2441	SETUP_ExitEvent db ? ; Exit Event to end SETUP
2442	TempPasswordEntry db 17 dup (?)
2443	SETUP_OldPwd db 17 dup (?)
2444	SETUP_NewPwd db 17 dup (?)
2445	SETUP_VerifyPwd db 17 dup (?)
2446	StartSoundPlayed db ?
2447	ChangePartNameSave db ? ; Save label after user-edit ?
2448	SyncLvmLabels db ? ; Sync LVM labels after user-edit ?
2449	ALIGN 16
2450
2451
2452	; -----------------------------------------------------------------------------
2453	; FX RELATED VARS
2454	; -----------------------------------------------------------------------------
2455	FX_UseCount dw ?
2456	FX_OverallTimer dw ?
2457	FX_WideScrollerTimer dw ?
2458	FX_WideScrollerCurPos dw ?
2459	FX_WideScrollerSpeed db ?
2460	FX_WideScrollerSpeedState db ?
2461	FX_WideScrollerDirection db ?
2462	FX_WideScrollerAbsDirection db ?
2463	FX_WideScrollerBounceSpeed db ?
2464	FX_CooperBarsTimer dw ?
2465	ALIGN 16
2466
2467	; Dynamically Generated Tables - do not need to get initialized with NUL
2468	FX_CooperColors db 672 dup (?) ; 7 cooper bars*96 - runtime calculated
2469	FX_CooperState db 7 dup (?)
2470	FX_SinusPos db 7 dup (?)
2471	FX_CooperPos dw 7 dup (?)
2472	ALIGN 16
2473
2474
2475	; -----------------------------------------------------------------------------
2476	; CHARSET BUFFER
2477	; -----------------------------------------------------------------------------
2478	CharsetTempBuffer db 4096 dup (?) ; Uninitialized Charset buffer
2479	ALIGN 16
2480
2481
2482	; -----------------------------------------------------------------------------
2483	; LVM CRC TABLE
2484	; -----------------------------------------------------------------------------
2485	LVM_CRCTable dd 256 dup (?) ; LVM-CRC (->SPECiAL\LVM.asm)
2486	ALIGN 16
2487
2488
2489	; -----------------------------------------------------------------------------
2490	; LVM DRIVE-LETTER MAP
2491	; -----------------------------------------------------------------------------
2492	; Get's initialized at startup to: 00000011111111111111111111111100b
2493	; Meaning A,B not free; C-Z free, rest unused. (right to left)
2494	; Each partition with an assigned drive-letter clears a bit in this map.
2495	FreeDriveletterMap dd ?
2496	ALIGN 16
2497
2498
2499	; -----------------------------------------------------------------------------
2500	; OS/2 PHASE1 RELATED
2501	; -----------------------------------------------------------------------------
2502	Phase1Active db ?
2503	OldPartitionCount db ?
2504	ALIGN 16
2505
2506
2507	; -----------------------------------------------------------------------------
2508	; ARRAY OF DISK INFORMATION STRUCTURES
2509	; -----------------------------------------------------------------------------
2510	; Array of DISKINFO structures
2511	DiskInformation db MaxDisks dup(DISKINFO_Size dup(?))
2512	ALIGN 16
2513
2514
2515	; -----------------------------------------------------------------------------
2516	; INT13X DAP
2517	; -----------------------------------------------------------------------------
2518	; Disk Address Package that holds information for LBA-access using INT13X
2519	INT13X_DAP db ? ; Size of paket, inserted by code
2520	db ? ; Reserved
2521	INT13X_DAP_NumBlocks dw ? ; Number of blocks
2522	INT13X_DAP_Transfer dd ? ; Transfer Adress
2523	INT13X_DAP_Absolute dd ? ; Absolute Sector
2524	dd ? ; Second Part of QWORD
2525	INT13X_DAP_Size = $-offset [INT13X_DAP] ; Calculated size
2526	ALIGN 16
2527
2528
2529	; -----------------------------------------------------------------------------
2530	; DEBUG
2531	; -----------------------------------------------------------------------------
2532	; Some debug area.
2533	dbg_scratch db 512 dup(?)
2534	ALIGN 16
2535
2536
2537	; End of transient variables.
2538	EndOfVariables:
2539	EndOfVariablesAbs = offset EndOfVariables + image_size
2540
2541
2542
2543	; -----------------------------------------------------------------------------
2544	; OLD AND NEW STACKS
2545	; -----------------------------------------------------------------------------
2546	; BOOKMARK: Storage for Old and New Stack Pointers
2547	;
2548	; These need to be outside the variable section because AiR-BOOT can restart
2549	; itself in debug-mode. If the OldSP and OldSS would be in the variable area,
2550	; they would be cleared on AiR-BOOT restart.
2551	;
2552
2553	; The variable section is cleared word-wise, so it could clear one byte extra
2554	; depending on the alignment and size. This DD prevents the OldSP and OldSS
2555	; to be partly overwritten by the clearing routine.
2556	dd ?
2557	ALIGN 16
2558
2559	; SS:SP from before our relocation.
2560	; The registers values when the BIOS transferred control to us were pushed
2561	; on this stack.
2562
2563	OldSP dw ?
2564	OldSS dw ?
2565
2566	; SS:SP currently in use.
2567	; They are temporarily dumped here so we can pop the resgisters from
2568	; the old stack to display them in debug mode.
2569	CurrentSP dw ?
2570	CurrentSS dw ?
2571	ALIGN 16
2572
2573	; Usually, commits are buildable and some minor checking has been done that
2574	; whole disks do not get wiped. However, there are situations where stuff is
2575	; in such a flux that it would be better to do non-buildable commits.
2576	; That makes it possible to record the changes piecemeal without the danger of
2577	; accidently using the resulting loader. Of course everyone is clever enough
2578	; to _never_ build commits marked as 'testing' and install the result in
2579	; environments where wiping all attached disks and sticks would be a problem...
2580	;~ force_build_error dd 0f000h dup(?)
2581
2582	;
2583	; End of BSS segment.
2584	;
2585	eobss:
2586	eobss_abs = offset eobss + image_size
2587	;
2588	; Total RAM occupied, including BSS.
2589	; BASE is 8000:0000, LIMIT is 8000:FFFF.
2590	; Note that the LDRIMAGE is of constant size, 7C00h = 62 sectors of 512 bytes.
2591	;
2592	resident_size = offset eobss + image_size
2593
2594	;
2595	; Close BSS segment.
2596	;
2597	IFDEF SEGMENTED
2598	VOLATILE ENDS
2599	ELSE
2600	LDRIMAGE ENDS
2601	ENDIF
2602
2603	; BOOKMARK: End of Module
2604	END AiR_BOOT
2605

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