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airboot.asm@ 171

Last change on this file since 171 was 167, checked in by Ben Rietbroek, 8 years ago

Enabled the new disk-info display on pre-MENU [v1.1.1-testing]

While many parts of the underlying engine have been enhanced,
this will probably be the most visible change for AiR-BOOT users... ;)

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: 98.8 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
830	cmp MBR_CheckCode, bx
831	;~ je MBR_RealStart_CheckSuccess ; CRC verified
832	jmp MBR_RealStart_CheckSuccess ; Ignore CRC
833
834	; Oops, checksum mismatch -- halt the system
835	mov si, offset TXT_ERROR_Attention
836	call MBR_Teletype
837	mov si, offset TXT_ERROR_CheckCode
838	call MBR_Teletype
839	mov si, offset TXT_ERROR_CheckFailed
840	call MBR_Teletype
841	jmp MBR_HaltSystem
842
843
844	;
845	; OK, all loading went fine so the rest of the code
846	; is present now, so we jump to it.
847	; The old SS:SP is still on the stack.
848	;
849	MBR_RealStart_CheckSuccess:
850	jmp AiR_BOOT_Start
851
852
853
854
855
856	;------------------------------------------------------------------------------
857	include text/txtmbr.asm ; All translateable Text in MBR
858	;------------------------------------------------------------------------------
859
860	; Disk Signature
861	ORIGIN 001B8h
862
863
864	; Disk Signature
865	; Note that in an LVM 2.x MBR this collides
866	; with the dummy PTE that it uses to look for IBM-BM
867	; on the second harddisk.
868	; AiR-BOOT installer will merge the field
869	; from the MBR it replaces.
870	MBR_DrvSig db 'DSIG'
871
872	; Unused word at 01BCh.
873	; An LVM 2.x MBR puts 0CC33h here.
874	; AiR-BOOT installer will merge the field
875	; from the MBR it replaces.
876	MBR_Spare dw '$$'
877
878
879	; Partition Table.
880	ORIGIN 001BEh
881
882	; The 4 entries just for show.
883	; AiR-BOOT installer will merge them from the MBR it replaces.
884	MBR_PartTable:
885	db 16 dup('0')
886	db 16 dup('1')
887	db 16 dup('2')
888	db 16 dup('3')
889
890	; Boot Sigbature
891	MBR_Sig dw 0aa55h
892
893
894
895
896
897
898
899	;==============================================================================
900	; Sector 2
901	;==============================================================================
902
903	; -----------------------------------------------------------------------------
904	; FILE-SYSTEM TABLES
905	; -----------------------------------------------------------------------------
906
907	; First sector the rest of the loader image
908	ORIGIN 00200h
909
910	;
911	; Everything beyond this point is loaded on startup
912	; and is NOT existant at first
913	;
914	FurtherMoreLoad:
915
916	;
917	; Filesystem table correlating id with name.
918	;
919
920	; first Normal-Partition-ID, Hidden-Partition-ID
921	; and Default-Partition-Flags.
922	; 01h -> Boot-Able
923	; 10h -> FAT32 - Name Getting Scheme
924	; 20h -> No Name To Get (use Partition Name from IPT)
925	; 40h -> 'L' flag possible
926	db 'AiRSYS-TABLE'
927	FileSysIDs db 01h, 11h,01h, 04h,014h,01h, 06h,016h,41h, 0Eh,00Eh,01h
928	db 07h, 17h,41h, 08h,017h,21h, 35h,035h,20h,0FCh,017h,41h
929	db 09h, 19h,11h, 0Bh,01Bh,11h, 0Ch,01Ch,11h,0EBh,0EBh,01h
930	db 63h, 63h,21h, 81h,081h,21h, 83h,083h,21h, 40h,040h,21h
931	db 0A5h,0A5h,21h,0A6h,0A6h,21h, 82h,082h,20h,0A7h,0A7h,21h
932	db 63h, 63h,21h, 4Dh,04Dh,21h, 4Eh,04Eh,21h, 4Fh,04Fh,21h
933	db 01h, 01h,01h, 01h,001h,01h, 01h,001h,01h, 01h,001h,01h
934	db 01h, 01h,01h, 01h,001h,01h, 01h,001h,01h, 01h,001h,01h
935	db 01h, 01h,01h, 01h,001h,01h, 01h,001h,01h, 01h,001h,01h
936	db 01h, 01h,01h,0FDh,0FDh,20h, 84h,084h,20h,0A0h,0A0h,20h
937	db 0Ah, 0Ah,20h,0FEh,0FEh,21h,0FFh,0FFh,21h, 00h,000h,21h
938	db 16 dup (0)
939
940	FileSysNames db 'FAT12 ', 'FAT16 ', 'FAT16Big', 'FAT16Big'
941	db 'HPFS ', 'NTFS ', 'LVM-Data', 'JFS '
942	db 'FAT32 ', 'FAT32 ', 'FAT32 ', 'BeOS '
943	db 'Unix ', 'Minix ', 'Linux ', 'Venix ' ; x row ;)
944	db 'BSD/386 ', 'OpenBSD ', 'LinuxSwp', 'NeXTSTEP'
945	db 'GNU HURD', 'QNX ', 'QNX ', 'QNX '
946	db ' ', ' ', ' ', ' '
947	db ' ', ' ', ' ', ' '
948	db ' ', ' ', ' ', ' '
949	db ' ', 'Kernel ', ' ', '0V-Award'
950	; db 'OS/2 Man', 'via BIOS', 'Floppy ', 'Unknown '
951	db 'OS2-BMGR', 'via BIOS', 'Floppy ', 'Unknown '
952	; -> 44 Partition-Types
953
954
955
956
957
958
959	;==============================================================================
960	; Sector 3
961	;==============================================================================
962
963	; -----------------------------------------------------------------------------
964	; ENTRY-POINT AFTER LOADING THE REST OF THE CODE
965	; -----------------------------------------------------------------------------
966
967	; The entry-point jumped to from the MBR code
968	ORIGIN 00400h
969
970
971	;##############################################################################
972	;# AiR_BOOT_Start :: This is where the real work begins #
973	;# -------------------------------------------------------------------------- #
974	;# At this point, all of AirBoot is loaded, including its configuration. #
975	;# First, some setup is done, which includes the initialization of variables #
976	;# in the BSS. After that, disks are scanned for partitions and the required #
977	;# house keeping is done to incorporate changes from the previous boot. Then #
978	;# the partition list is prepared and the menu is presented. #
979	;##############################################################################
980	; BOOKMARK: AiR_BOOT_Start (AiR-BOOT now completely loaded)
981	AiR_BOOT_Start:
982
983
984	;
985	; Enable interrupts.
986	;
987	sti
988
989	;
990	; Pop the old SS:SP from the stack and save it in the BSS.
991	; Note that this is outside the normal variable area that gets cleared.
992	; This allows AiR-BOOT to restart itself when debugging and come-up
993	; with access to the original values of registers the BIOS passed.
994	;
995	pop [OldSP]
996	pop [OldSS]
997
998	; Clear the BSS from its real start just upto the end of the variables.
999	; Here 'real start' means from where the BSS begins, which is below
1000	; the point where the first variables are located. The part after
1001	; the variables is not cleared because that is where the old SS:SP is
1002	; stored, which is needed for AirBoot restarts during debugging.
1003	mov bx, offset sobss
1004	mov cx, offset EndOfVariables - offset sobss
1005	xor ax, ax
1006	call FillMemBlock
1007
1008	; Initialize the com-port for debugging
1009	IFDEF AUX_DEBUG
1010	PUSHRF
1011	; Init com-port
1012	call AuxIO_Init
1013	; Hello message
1014	mov si, offset [AuxIOHello]
1015	call AuxIO_Print
1016	; Show Build Info
1017	call AuxIO_PrintBuildInfo
1018	call AuxIO_TeletypeNL
1019	POPRF
1020	ENDIF
1021
1022	; Dump debug information
1023	IFDEF AUX_DEBUG
1024	IF 1
1025	call DEBUG_Dump1
1026	ENDIF
1027	ENDIF
1028
1029	; Verify we still got the BIOS disk in DL
1030	IFDEF AUX_DEBUG
1031	IF 1
1032	DBG_TEXT_OUT_AUX '## AiR_BOOT_Start ##'
1033	PUSHRF
1034	call DEBUG_DumpRegisters
1035	POPRF
1036	ENDIF
1037	ENDIF
1038
1039
1040	; -----------------------------------------------------------------------------
1041	; IBM-BM BOOT PREPARATION
1042	; -----------------------------------------------------------------------------
1043	;
1044	; Since v1.0.8, AiR-BOOT is able to chainload IBM-BM.
1045	; When IBM-BM resides above the 1024-cylinder limit, the 'I13X'
1046	; signature is required at 3000:0000, FS needs to contain 3000h
1047	; and the 32-bit LBA address needs to follow the 'I13X' signature.
1048	; For booting IBM-BM from the second disk, a copy of the MBR of the
1049	; first disk is also required at 0000:7E00.
1050	; This information is derived from the eCS 2.x LVM MBR.
1051	;
1052	; So, now is a good time to copy the MBR of the first disk to
1053	; 0000:7E00 in case the partition that will be started is IBM-BM.
1054	; This copy is located at 8000:0000 and DS already points to this
1055	; segment. The 'I13X' signature and FS will be setup later.
1056	;
1057	pusha ; Save all the general purpose regs
1058	push es ; We need ES too, so save its value
1059	xor ax,ax ; Segment 0000h
1060	mov es,ax ; Make ES point to it
1061	mov si,offset BootBasePtr ; Start of AiR-BOOT which has the MBR
1062	mov di,7e00h ; Destination for the MBR for IBM-BM
1063	mov cx,100h ; 256 words = 512 bytes
1064	cld ; Direction from low to high
1065	rep movsw ; Copy the 256 words of the MBR
1066	pop es ; Restore previous value of ES
1067	popa ; Restore all the general purpose regs
1068
1069
1070	; -----------------------------------------------------------------------------
1071	; PRECRAP
1072	; -----------------------------------------------------------------------------
1073
1074	;
1075	; First it clears the BSS area.
1076	; Note that the old SS:SP is stored outside this area so this
1077	; does not get lost.
1078	; Then initialize various runtime variables and structures.
1079	;
1080	; BOOKMARK: Pre Crap
1081	call PRECRAP_Main
1082	; Number of harddisks and other system-info is now known.
1083
1084	;!
1085	;! DEBUG_BLOCK
1086	;! Let's see what the BIOS supplied us with...
1087	;! Uncomment below to activate.
1088	;!
1089	IFDEF AUX_DEBUG
1090	IF 0
1091	pushf
1092	pusha
1093
1094	; Print title.
1095	mov si,offset [bios_reg]
1096	call AuxIO_Print
1097	; Save the current stack (SS:SP).
1098	mov ax,ss
1099	mov [CurrentSS],ax
1100	mov [CurrentSP],sp
1101
1102	; Restore the old stack.
1103	mov ss,[OldSS]
1104	mov sp,[OldSP]
1105
1106	; Pop the registers with the BIOS values.
1107	popa
1108	; Push them back for AiR-BOOT restart (debug mode).
1109	pusha
1110	; Dump them to the serial-port.
1111	call DEBUG_DumpRegisters
1112	; Restore the current stack.
1113	mov ax,[CurrentSS]
1114	mov ss,ax
1115	mov sp,[CurrentSP]
1116
1117	popa
1118	popf
1119	ENDIF
1120	ENDIF
1121
1122
1123
1124	; -----------------------------------------------------------------------------
1125	; UPDATE MBR
1126	; -----------------------------------------------------------------------------
1127
1128	; Write MBR back to disk to sync MBR variables.
1129	; Otherwise subsequent MBR loads will differ from the RAM stored one,
1130	; which is used by MBR protection to validate parts of the MBR.
1131	xor bx, bx ; 0000h - our load address (8000:0000)
1132	mov cx, 1 ; CHS sector 1, cylinder 0
1133	xor dh, dh ; CHS head 0
1134	mov dl, [BIOS_BootDisk] ; The disk we were loaded from
1135	mov al, 1 ; One sector to write
1136	mov ah, 03h ; BIOS write disk (legacy)
1137	int 13h ; Call BIOS
1138	;!
1139	;! TODO: Check success
1140	;! Yes, we should check for errors here, coz it would mean AirBoot
1141	;! was loaded from a disk where the MBR cannot be written !
1142	;!
1143
1144
1145
1146	; -----------------------------------------------------------------------------
1147	; SCAN DISKS
1148	; -----------------------------------------------------------------------------
1149
1150	;!
1151	;! DEBUG_BLOCK
1152	;! Dump the registers at this point.
1153	;!
1154	IFDEF AUX_DEBUG
1155	IF 0
1156	PUSHRF
1157	call DEBUG_DumpRegisters
1158	;~ call DEBUG_DumpDriveLetters
1159	;~ call DEBUG_DumpVolumeLetters
1160	;~ call DEBUG_DumpPartitionXref
1161	POPRF
1162	ENDIF
1163	ENDIF
1164
1165
1166	;
1167	; Scan disks for information like size etc.
1168	;
1169	call DriveIO_ScanDisks
1170
1171	;!
1172	;! DEBUG_BLOCK
1173	;! Dump the registers at this point.
1174	;!
1175	IFDEF AUX_DEBUG
1176	IF 0
1177	PUSHRF
1178	call DEBUG_DumpRegisters
1179	;~ call DEBUG_DumpDriveLetters
1180	;~ call DEBUG_DumpVolumeLetters
1181	;~ call DEBUG_DumpPartitionXref
1182	POPRF
1183	ENDIF
1184	ENDIF
1185
1186
1187	; -----------------------------------------------------------------------------
1188	; SCAN FOR PARTITIONS
1189	; -----------------------------------------------------------------------------
1190
1191	;
1192	; Scan disks for partitions
1193	;
1194	call PARTSCAN_ScanForPartitions
1195
1196	;
1197	; Internal Partition Table is now populated.
1198	;
1199
1200	;!
1201	;! DEBUG_BLOCK
1202	;! Dump various tables.
1203	;!
1204	IFDEF AUX_DEBUG
1205	IF 0
1206	PUSHRF
1207	;~ call DEBUG_DumpIPT
1208	;~ call DEBUG_DumpPartitionPointers
1209	;~ call DEBUG_DumpNewPartTable
1210	;~ call DEBUG_DumpDriveLetters
1211	;~ call DEBUG_DumpDriveLetters
1212	;~ call DEBUG_DumpVolumeLetters
1213	;~ call DEBUG_DumpPartitionXref
1214	POPRF
1215	ENDIF
1216	ENDIF
1217
1218
1219	; -----------------------------------------------------------------------------
1220	; RESTORE FORCED DRIVELETTER CORRELATION [LVM]
1221	; -----------------------------------------------------------------------------
1222
1223	;
1224	; Reconnect forced drive-letters to their corresponding
1225	; partitions.
1226	;
1227	; BOOKMARK: Update Driveletters so they are in-sync again
1228	call PARTSCAN_UpdateDriveLetters
1229	; Driveletter <-> Partition correlation is now restored.
1230
1231
1232
1233	;!
1234	;! DEBUG_BLOCK
1235	;! Dump various tables.
1236	;!
1237	IFDEF AUX_DEBUG
1238	IF 0
1239	PUSHRF
1240	;~ call DEBUG_DumpIPT
1241	;~ call DEBUG_DumpPartitionPointers
1242	;~ call DEBUG_DumpNewPartTable
1243	;~ call DEBUG_DumpDriveLetters
1244	;~ call DEBUG_DumpDriveLetters
1245	;~ call DEBUG_DumpVolumeLetters
1246	;~ call DEBUG_DumpPartitionXref
1247	POPRF
1248	ENDIF
1249	ENDIF
1250
1251
1252	; -----------------------------------------------------------------------------
1253	; SHOW WE ARE ALIVE
1254	; -----------------------------------------------------------------------------
1255
1256	;
1257	; Put some info about AiR-BOOT and the system on the screen.
1258	;
1259
1260	; Display number of physical disks found
1261	IFNDEF AUX_DEBUG
1262	mov [TextPosY], 3
1263	ELSE
1264	mov [TextPosY], 4
1265	ENDIF
1266	mov [TextPosX], 0
1267	mov si, offset [DisksFound]
1268	call VideoIO_Print
1269	mov al, [TotalHarddiscs]
1270	mov [TextColorFore], 0fh
1271	call VideoIO_PrintByteDynamicNumber
1272	mov [TextColorFore], 07h
1273
1274	; Display number of partitions found
1275	inc [TextPosY]
1276	mov [TextPosX], 0
1277	mov si, offset [PartitionsFound]
1278	call VideoIO_Print
1279	mov al, [CFG_Partitions]
1280	call VideoIO_PrintByteDynamicNumber
1281
1282	; Display Phase 1 Indicator
1283	inc [TextPosY]
1284	mov [TextPosX], 0
1285	mov si, offset [Phase1]
1286	call VideoIO_Print
1287	mov si, offset [OS2_InstallVolume]
1288	mov al, [si]
1289	test al,al ; See if phase 1 is active
1290	jnz @F
1291	mov si, offset [No]
1292	@@:
1293	call VideoIO_Print
1294
1295	; Display information about the disks found
1296	call VideoIO_DisplayDiskInfo
1297
1298
1299
1300	; -----------------------------------------------------------------------------
1301	; OS/2 PHASE1 CHECK
1302	; -----------------------------------------------------------------------------
1303
1304	;
1305	; BOOKMARK: Check for OS/2 being installed
1306	; Here we check if OS/2 is being installed.
1307	; If so, we forgo the menu and directly boot it.
1308	;
1309
1310	; If the first byte of the name of the Install Volume is not 0
1311	; then we potentially have a phase1 boot.
1312	test byte ptr [OS2_InstallVolume],0ffh
1313	; Nope, so continue normally.
1314	jz MBR_Main_ContinueBoot
1315
1316	; Setup phase1.
1317	; It is still possible that a name was set for the
1318	; Install Volume that does not exist.
1319	; In that case CY will be clear and AL=0FFh.
1320	call PART_SetupPhase1
1321	; Oops, Install Volume not found, continue normally.
1322	jnc MBR_Main_ContinueBoot
1323
1324
1325	;
1326	; == Install Volume Found ==
1327	;
1328
1329
1330	;!
1331	;! DEBUG_BLOCK
1332	;! Dump various tables.
1333	;!
1334	IFDEF AUX_DEBUG
1335	IF 0
1336	PUSHRF
1337	;~ call DEBUG_DumpIPT
1338	;~ call DEBUG_DumpPartitionPointers
1339	;~ call DEBUG_DumpPartitionXref
1340	;~ call DEBUG_DumpNewPartTable
1341	;~ call DEBUG_DumpDriveLetters
1342	POPRF
1343	ENDIF
1344	ENDIF
1345
1346
1347	; BOOKMARK: Scan for Partitions (Only if OS/2 install going on)
1348	; Because one or more partitions are possibly added, the
1349	; PartitionXref table is not 'in sync' and could cause the
1350	; wrong system to be automatically booted.
1351	; So we rescan all partitions causing the PartitionXref
1352	; table to be filled with correct values so the auto-boot
1353	; from the new partition will work correctly.
1354	call PARTSCAN_ScanForPartitions
1355
1356
1357	;!
1358	;! DEBUG_BLOCK
1359	;! Dump various tables.
1360	;!
1361	IFDEF AUX_DEBUG
1362	IF 0
1363	PUSHRF
1364	;~ call DEBUG_DumpIPT
1365	;~ call DEBUG_DumpPartitionPointers
1366	;~ call DEBUG_DumpPartitionXref
1367	;~ call DEBUG_DumpNewPartTable
1368	;~ call DEBUG_DumpDriveLetters
1369	POPRF
1370	ENDIF
1371	ENDIF
1372
1373	; Setup automatic boot to forgo the Menu.
1374	; PART_SetupPhase1 has filled in the other variables.
1375	mov byte ptr [CFG_AutomaticBoot],1
1376
1377	;
1378	; At this point the AiR-BOOT configuration has been altered
1379	; to automatically boot the newly installed system without
1380	; displaying the menu.
1381	; Code further down the road will take care of that.
1382	;
1383	jmp MBR_Main_ContinueBoot
1384
1385
1386
1387
1388	;
1389	; Wether a new system is being installed or not,
1390	; booting continues here.
1391	;
1392	MBR_Main_ContinueBoot:
1393
1394	;
1395	; Inform user how to switch between post-screen and menu
1396	; by putting this info on the screen.
1397	;
1398	mov [TextPosY], 23
1399	mov [TextPosX], 0
1400	mov si, offset [TABMessage]
1401	call VideoIO_Print
1402	inc [TextPosY]
1403	mov [TextPosX], 57
1404	call MBR_TeletypeSyncPos
1405	mov si, offset [PREPMessage]
1406	call MBR_TeletypeBold
1407	mov al,30
1408	call TIMER_WaitTicCount
1409	mov cl, sizeof [PREPMessage]
1410	mov al, ' '
1411	call VideoIO_PrintSingleMultiChar
1412
1413	mov [TextPosX], 25
1414	mov si, offset [BootEndMsg2]
1415	add si, 39
1416	mov [TextColorFore], 08h
1417	call VideoIO_Print
1418
1419
1420	;
1421	; Debug stop.
1422	;
1423
1424	;
1425	; ####################### WAIT FOR KEY ########################
1426	;
1427
1428	; Wait for key so we can see debug log if ab-menu hangs.
1429	;~ xor ax, ax
1430	;~ int 16h
1431	;call SOUND_Beep
1432
1433
1434	; Copy BIOS POST to Second Page
1435	mov ax, VideoIO_Page1
1436	call VideoIO_BackUpTo
1437
1438	;call SOUND_Beep
1439
1440
1441	; BOOKMARK: Save Configuration
1442	; Save configuration so phase1 boot-through is disabled
1443	; on next boot.
1444	mov byte ptr [OS2_InstallVolume], 0
1445	call DriveIO_SaveConfiguration
1446
1447
1448
1449	;
1450	; See if setup needs to be entered.
1451	;
1452	MBR_Main_ReEnterSetup:
1453	call SETUP_CheckEnterSETUP
1454
1455	;
1456	; Do some post processing.
1457	;
1458	; BOOKMARK: After Crap
1459	call AFTERCRAP_Main
1460
1461	MBR_Main_ReEnterBootMenuPre:
1462	; SetUp PartitionPointers for BootMenu (filter non-bootable)
1463	call PART_CalculateMenuPartPointers
1464
1465	; ...and count that one...
1466	cmp byte ptr [PartitionPointerCount], 0
1467	jne MBR_Main_SomethingBootAble
1468	mov si, offset TXT_NoBootAble
1469	call MBR_Teletype
1470	jmp MBR_HaltSystem
1471
1472	MBR_Main_SomethingBootAble:
1473	; FixUp Values, define Timed Setup booting, etc.
1474	call PART_FixUpDefaultPartitionValues
1475
1476
1477
1478	; -------------------------------------------------- BOOT-MENU
1479	MBR_Main_ReEnterBootMenu:
1480	call BOOTMENU_ResetMenuVars ; reset has to be done
1481	test byte ptr [CFG_AutomaticBoot], 1
1482	jz MBR_Main_NoAutomaticBooting
1483
1484
1485	; ------------------------------------------ AUTOMATIC BOOTING
1486	; Select automatic partition, disable automatic booting for
1487	; next time and boot system...
1488	mov byte ptr [CFG_AutomaticBoot], 0
1489	call PASSWORD_AskSystemPwd
1490	mov al, Menu_EntryAutomatic
1491
1492	;mov al, 2
1493
1494	mov Menu_EntrySelected, al ; zero based
1495	jmp MBR_Main_NoBootMenu
1496
1497
1498	MBR_Main_NoAutomaticBooting:
1499
1500	;call SOUND_Beep
1501
1502	test byte ptr [CFG_BootMenuActive], 0FFh
1503	jnz MBR_Main_GotBootMenu
1504	; ----------------------------------------------- NO BOOT-MENU
1505	; Select default partition and boot system...
1506	call PASSWORD_AskSystemPwd
1507
1508	mov al, Menu_EntryDefault
1509	;mov al,0 ; zero based
1510	mov Menu_EntrySelected, al
1511	jmp MBR_Main_NoBootMenu
1512
1513	MBR_Main_GotBootMenu:
1514	; ------------------------------------------ BOOT-MENU VISUALS
1515
1516
1517	IFDEF FX_ENABLED
1518	call FX_StartScreen
1519	ENDIF
1520
1521	; BOOKMARK: Build Main Menu
1522	call BOOTMENU_BuildBackground
1523	call BOOTMENU_BuildMain
1524
1525	IFDEF FX_ENABLED
1526	call FX_EndScreenRight
1527	ENDIF
1528
1529	call PASSWORD_AskSystemPwd
1530	call BOOTMENU_ResetTimedBoot
1531
1532	; BOOKMARK: Display Main Menu
1533	call BOOTMENU_Execute
1534
1535	jc MBR_Main_ReEnterSetup
1536	call BOOTMENU_SetVarsAfterMenu
1537
1538	; ---------------------------------------------------- BOOTING
1539	MBR_Main_NoBootMenu:
1540
1541	IFDEF FX_ENABLED
1542	call FX_StartScreen
1543	ENDIF
1544
1545	IFDEF AUX_DEBUG
1546	IF 0
1547	DBG_TEXT_OUT_AUX 'HALTING'
1548	PUSHRF
1549	;~ call DEBUG_DumpRegisters
1550	;~ call AuxIO_DumpParagraph
1551	;~ call AuxIO_TeletypeNL
1552	@@: jmp @B
1553	POPRF
1554	ENDIF
1555	ENDIF
1556	; BOOKMARK: Display bye-screen and start selected partition
1557	call BOOTMENU_BuildGoodBye
1558
1559	IFDEF FX_ENABLED
1560	call FX_EndScreenRight
1561	ENDIF
1562
1563	call PASSWORD_AskChangeBootPwd
1564
1565	call ANTIVIR_SaveBackUpMBR
1566
1567	; Preload the selected menu-entry
1568	; However, this value will be wrong if OS/2 phase1 is
1569	; active and the installation partition is newly created.
1570	; See below for the adjustment.
1571	mov dl, byte ptr [Menu_EntrySelected]
1572
1573
1574	;
1575	; Prepare to start the partition.
1576	;
1577	jmp MBR_Main_StartPartition
1578
1579
1580
1581	; -----------------------------------------------------------------------------
1582	; START PARTITION
1583	; -----------------------------------------------------------------------------
1584
1585	MBR_Main_StartPartition:
1586
1587	IFDEF AUX_DEBUG
1588	IF 0
1589	PUSHRF
1590	;~ call DEBUG_DumpIPT
1591	;~ call DEBUG_DumpPartitionPointers
1592	;~ call DEBUG_DumpPartitionXref
1593	;~ call DEBUG_DumpNewPartTable
1594	POPRF
1595	ENDIF
1596	ENDIF
1597
1598
1599	; -------------------------------------------- START PARTITION
1600	; THIS DOES NOT RETURN !
1601	call PART_StartPartition
1602
1603
1604
1605
1606	;
1607	; This entry-point restarts AiR-BOOT almost from scratch.
1608	; It skips the movement of the MBR but otherwise it is a functional restart.
1609	; The old BIOS SS:SP where the registers on entry are stored is passed along.
1610	; This entry-point is used for debugging purposes.
1611	;
1612	; BOOKMARK: AiR-BOOT Restart (used for debugging)
1613	AirbootRestart:
1614	mov bx, [OldSP] ; Old SP when BIOS transferred control to AB
1615	mov cx, [OldSS] ; Old SS when BIOS transferred control to AB
1616	xor dh, dh ; Head 0
1617	mov dl, [BIOS_BootDisk] ; Disk AirBoot was loaded from
1618	jmp MBR_RealStart
1619
1620
1621	;
1622	; This entry-point displays a popup that the system is halted
1623	; and then halts the system.
1624	; It is entered on severe error conditions.
1625	;
1626	; BOOKMARK: Halt System
1627	HaltSystem:
1628	call VideoIO_ClearScreen
1629	mov ax,0ababh
1630	mov cx, 0C04h
1631	mov si, offset SystemHalted
1632	call SETUP_ShowErrorBox
1633	; Halt the system.
1634	jmp MBR_HaltSystem
1635
1636
1637
1638
1639
1640
1641	;
1642	; The following section includes various assembler modules
1643	; at the source level. These contain functionality for a
1644	; multitude of categories like disk-access, video-io, lvm,
1645	; debugging, etc. Later versions of AiR-BOOT will use such
1646	; modules at the object-file level so they can be shared
1647	; more easily.
1648	;
1649
1650
1651	; -----------------------------------------------------------------------------
1652	; INCLUDED FILE SECTION
1653	; -----------------------------------------------------------------------------
1654
1655	; BOOKMARK: Include Section
1656
1657	;
1658	; Include other code-modules here.
1659	;
1660
1661	b_std_txt:
1662	include regular/std_text.asm ; Standard (non-translateable text)
1663	size_std_txt = $-b_std_txt
1664
1665	b_driveio:
1666	include regular/driveio.asm ; Drive I/O, Config Load/Save
1667	size_driveio = $-b_driveio
1668
1669	b_lvm:
1670	include special/lvm.asm ; LVM-specific code
1671	size_lvm = $-b_lvm
1672
1673	b_videoio:
1674	include regular/videoio.asm ; Video I/O
1675	size_videoio = $-b_videoio
1676
1677	b_timer:
1678	include regular/timer.asm ; Timer
1679	size_timer = $-b_timer
1680
1681	b_partmain:
1682	include regular/partmain.asm ; Regular Partition Routines
1683	size_partmain = $-b_partmain
1684
1685	b_partscan:
1686	include regular/partscan.asm ; Partition Scanning
1687	size_partscan = $-b_partscan
1688
1689	b_bootmenu:
1690	include regular/bootmenu.asm ; Boot-Menu
1691	size_bootmenu = $-b_bootmenu
1692
1693	b_password:
1694	include regular/password.asm ; Password related
1695	size_password = $-b_password
1696
1697	b_other:
1698	include regular/other.asm ; Other Routines
1699	size_other = $-b_other
1700
1701	b_main:
1702	include setup/main.asm ; The whole AiR-BOOT SETUP
1703	size_main = $-b_main
1704
1705	b_math:
1706	include regular/math.asm ; Math functions (like 32-bit multiply)
1707	size_math = $-b_math
1708
1709	b_txtother:
1710	include text/txtother.asm ; All translateable Text-Strings
1711	size_txtother = $-b_txtother
1712
1713	b_txtmenus:
1714	include text/txtmenus.asm ; All translateable Menu-text
1715	size_txtmenus = $-b_txtmenus
1716
1717	b_charset:
1718	include text/charset.asm ; Special Video Charsets (if needed)
1719	size_charset = $-b_charset
1720
1721	b_conv:
1722	include regular/conv.asm ; Various conversion routines
1723	size_conv = $-b_conv
1724
1725	b_virus:
1726	include special/virus.asm ; Virus Detection / Anti-Virus
1727	size_virus = $-b_virus
1728
1729	b_billsuxx:
1730	include special/f00k/billsuxx.asm ; Extended Partition - Microsoft-Hack
1731	size_billsuxx = $-b_billsuxx
1732
1733	b_sound:
1734	include special/sound.asm ; Sound
1735	size_sound = $-b_sound
1736
1737	b_apm:
1738	include special/apm.asm ; Power Managment Support
1739	size_apm = $-b_apm
1740
1741
1742
1743	;
1744	; Cyrillic support.
1745	;
1746	IFDEF TXT_IncludeCyrillic
1747	b_ccharset:
1748	include special/charset.asm ; Charset Support (e.g. Cyrillic)
1749	size_ccharset = $-b_ccharset
1750	ENDIF
1751
1752	; Various debugging routines, uses AUXIO and CONV
1753	IFDEF AUX_DEBUG
1754	b_debug:
1755	include regular/debug.asm ; Debug module
1756	size_debug = $-b_debug
1757	b_auxio:
1758	include regular/auxio.asm ; Com-port support for debugging
1759	size_auxio = $-b_auxio
1760	ENDIF
1761
1762	;
1763	; We only include this if FX_ENABLED is defined.
1764	; FX is disabled when debugging to have more room for debug-code.
1765	; The module compiles to 50eh = 1294 bytes, so that is a lot.
1766	;
1767	IFDEF FX_ENABLED
1768	b_fx:
1769	include special/fx.asm ; l33t Cooper-Bars/Scrolling <bg>
1770	size_fx = $-b_fx
1771	ENDIF
1772
1773
1774	;
1775	; End of code marker.
1776	;
1777	; BOOKMARK: END OF CODE
1778	db 'BABE'
1779	db 'FACE'
1780
1781
1782	; -----------------------------------------------------------------------------
1783	; END OF CODE
1784	; -----------------------------------------------------------------------------
1785	code_end:
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796	; -----------------------------------------------------------------------------
1797	; BLDLEVEL INFORMATION
1798	; -----------------------------------------------------------------------------
1799
1800	; BOOKMARK: BLDLEVEL Information
1801	ORIGIN 068A0h
1802
1803	;
1804	; The space between this offset and code_end is the space
1805	; available for code.
1806	;
1807	zzz_code_space = $ - code_end
1808
1809
1810	bld_level:
1811	;
1812	; Here we insert the OS/2 BLDLEVEL Information.
1813	; It is composed of the AiR-BOOT version-info and other
1814	; information. It is unique for each release of AiR-BOOT.
1815	;
1816
1817	;
1818	; ?? When AUX_DEBUG is enabled and the above org is active,
1819	; the BLDLEVEL gets corrupted eventhough it gets inserted here
1820	; explicitly. The effect is almost like an 'OR' or a merge
1821	; with the already generated FX code.
1822	; Tasm and JWasm produce different results.
1823	; ??
1824	;
1825	InsertBuildLevel
1826
1827
1828
1829
1830
1831	;==============================================================================
1832	; Sector 53
1833	;==============================================================================
1834
1835	;
1836	; From here on, the layout of the image consists of:
1837	; - AiR-BOOT Protection Image
1838	; - AiR-BOOT Configuration
1839	; - DriveLetters
1840	; - Install Volume
1841	; - Floppy/CDROM/BIOS BOOT ENTRIES
1842	; - Internal Partition Table (IPT)
1843	; - Hidden Partition Table (HPT)
1844	; - MBR Backup
1845	;
1846
1847	;
1848	; After that, the BSS follows with several runtime
1849	; variables and structures.
1850	; The BSS is not part of the image on disk of course.
1851	;
1852
1853	; -----------------------------------------------------------------------------
1854	; PROTECTION IMAGE
1855	; -----------------------------------------------------------------------------
1856
1857	;
1858	; This is the AiR-BOOT MBR Protection Image.
1859	; The stuff generated here gets overwritten when the
1860	; MBR_PROT module, which is assembled separately,
1861	; gets binary merged.
1862	; So you won't find the string below in the generated binary.
1863	;
1864	; BOOKMARK: AiR-BOOT MBR Protection Image
1865	ORIGIN 06900h
1866
1867
1868
1869
1870	;
1871	; Hardcoded to 768 bytes (MBR_PROT.ASM)
1872	; The string below is searched for by the FIXCODE helper and must be
1873	; page (256 bytes) aligned.
1874	;
1875	; It seems to be possible to shrink the protection-image to 768 bytes.
1876	; That gives us an additional 256 bytes of code-space.
1877	; MBR-PROT.ASM,FIXCODE.C,PARTMAIN.ASM and AIR-BOOT.ASM need to be adjusted for that.
1878	; Also the granularity needs to change from 512 bytes to 256 bytes since
1879	; 6900h is not a 512-byte boundary.
1880	;
1881	; 20120908 - Done.
1882	;
1883	MBR_Protection db 'AiR-BOOT MBR-Protection Image'
1884
1885	; Just fill.
1886	;~ db 1024-($-MBR_Protection) dup('M')
1887	db 768-($-MBR_Protection) dup('M')
1888
1889
1890
1891
1892
1893
1894
1895	;==============================================================================
1896	; Sector 55
1897	;==============================================================================
1898	; -----------------------------------------------------------------------------
1899	; AiR-BOOT CONFIGURATION
1900	; -----------------------------------------------------------------------------
1901
1902	;
1903	; This section contains the AiR-BOOT configuration.
1904	; Note that it has a version that should be updated
1905	; when stuff is added.
1906	; Also add stuff to the end so that offsets of other
1907	; variables remain vaild.
1908	;
1909	; BOOKMARK: AiR-BOOT Configuration Sector
1910	ORIGIN 06C00h
1911
1912	Configuration:
1913	; This is the signature for the AiR-BOOT Configuration.
1914	; Note that this configuration section, like the code section,
1915	; is CRC protected. This means that poking values in these
1916	; sections on the disk will invalidate AiR-BOOT and cause it
1917	; to halt. This is a protection method against other software
1918	; modifying stuff in track 0.
1919	db 'AiRCFG-TABLE',0adh
1920	db 01h, 10h, 'U' ; "Compressed" ID String
1921	; Version 1.02 was for code 1.06, 1.03 was internal
1922	; and 1.04,1.05 and 1.06 do not exist.
1923	;
1924	; 1.07 was used with AB v1.07 and introduced the phase1
1925	; system-name. For the rest it is compatible with v1.02.
1926	;
1927	; 1.0.8 is introduced with AB v1.0.8 and indicates the movement
1928	; of several components and the packing of the hideparttable.
1929	; The core configuration has not changed but the generated
1930	; configuration has. The v1.0.8 installer handles upgrading.
1931	;
1932	; It has been decided that uneven minor numbers will be
1933	; test-versions. Therefore v1.0.8 has been bumbed to v1.1.0.
1934	;
1935	; It is not required for the config to have the
1936	; same version as the code, so in the future
1937	; the code version might be higher than the
1938	; config version if there are no changes to the latter.
1939	;
1940
1941	CFG_LastTimeEditLow dw 0 ; Last Time Edited Stamp (will incr every setup)
1942	CFG_LastTimeEditHi dw 0 ; second 16 bit part...
1943
1944	CFG_CheckConfig dw 0 ; Check-Sum for Configuration
1945
1946	CFG_Partitions db 0 ; Count of partitions in IPT
1947	CFG_MiscFlags db 1 ; Miscellaneous Flags (See EQUates)
1948	CFG_PartDefault db 0 ; Default-Partition (Base=0)
1949
1950	CFG_PartLast db 0 ; Which Partition was booted last time ? (Base=0)
1951	CFG_TimedBoot db 0 ; Timed Boot Enable (for REAL Enable look TimedBootEnable)
1952	CFG_TimedSecs db 15 ; Timed Boot - How Many Seconds Till Boot
1953	CFG_TimedDelay dw 123 ; Timed Boot - Delay
1954	CFG_TimedBootLast db 1 ; Timed Boot - Boot From Last Drive Booted From
1955	CFG_RememberBoot db 1 ; Remember Manual Boot Choice
1956	CFG_RememberTimed db 0 ; Remember if Timed Boot (if both disabled: Boot Default)
1957	CFG_IncludeFloppy db 1 ; Include Floppy Drives in Boot-Menu
1958	CFG_BootMenuActive db 1 ; Display Boot-Menu (if Disabled: Boot Default)
1959	; v0.29+ -> 2 - Detailed Bootmenu
1960	CFG_PartitionsDetect db 1 ; Autodetect New Partitions (Auto-Add!)
1961	CFG_PasswordSetup db 0 ; Ask Password when entering Setup
1962	CFG_PasswordSystem db 0 ; Ask Password when booting System
1963	CFG_PasswordChangeBoot db 0 ; Ask Password when changing boot partition
1964	CFG_ProtectMBR db 0 ; Protect MBR via TSR ?
1965	CFG_IgnoreWriteToMBR db 0 ; Just ignore writes to MBR, otherwise crash
1966	CFG_FloppyBootGetName db 0 ; Gets floppy name for display purposes
1967	CFG_DetectVirus db 0 ; Detect Virus ?
1968	CFG_DetectStealth db 0 ; Detect Stealth-Virus ?
1969	CFG_DetectVIBR db 0 ; Detect BootRecord-Virus ?
1970	CFG_AutoEnterSetup db 0 ; Automatic Enter Setup (first install!)
1971	CFG_MasterPassword dw 0101Fh ; Encoded Password (this is just CR)
1972	dw 07A53h
1973	dw 0E797h
1974	dw 0A896h
1975	CFG_BootPassword dw 0101Fh ; Another CR... ;-)
1976	dw 07A53h
1977	dw 0E797h
1978	dw 0A896h
1979	db 0 ; Rude-Protection - Removed since v0.28b
1980	CFG_LinuxRootPartition db 0 ; Linux Root Partition (Base=0)
1981	CFG_TimedKeyHandling db 0 ; Timed Key Handling (for Timed Boot)
1982	; 0 - Do Nothing
1983	; 1 - Reset Time
1984	; 2 - Stop Time
1985	CFG_MakeSound db 0 ; Should be clear ;)
1986	CFG_FloppyBootGetTimer db 0 ; Floppy Name will get updated every 2 secs
1987	CFG_ResumeBIOSbootSeq db 1 ; If BIOS Boot Sequence should be resumed
1988	; 0 - Disabled
1989	; 1 - CD-ROM
1990	; 2 - Network
1991	; 3 - ZIP/LS120
1992	CFG_CooperBars db 0 ; If Cooper Bars should be shown
1993	CFG_LinuxCommandLine db 75 dup (0) ; Linux Command Line
1994	CFG_LinuxKrnlPartition db 0FFh ; FAT-16 Linux Kernel Partition (Base=0)
1995	; FFh -> Disabled
1996	CFG_LinuxDefaultKernel db 'DEFAULT', 4 dup (32), 0 ; Default Kernel Name
1997	CFG_LinuxLastKernel db 11 dup (32), 0 ; Last-Booted Kernel Name
1998	CFG_ExtPartitionMShack db 0 ; Extended Partition M$-Hack Global Enable
1999	CFG_AutomaticBoot db 0 ; Automatic Booting (only one bootup)
2000	CFG_PartAutomatic db 0 ; Partition-No for automatic booting
2001	CFG_ForceLBAUsage db 1 ; LBA-BIOS-API forced on any HDD I/O
2002	CFG_IgnoreLVM db 0 ; Ignores any LVM-Information
2003
2004
2005	;
2006	; THERE IS ROOM RESERVED HERE FOR MORE VARIABLES
2007	;
2008
2009	;
2010	; Drive Letters.
2011	;
2012	; BOOKMARK: Stored Drive Letters
2013	ORIGIN 06CB0h
2014
2015
2016	; -----------------------------------------------------------------------------
2017	; DRIVE LETTERS
2018	; -----------------------------------------------------------------------------
2019
2020	;
2021	; Moved here to make room for packed hiddenparttable.
2022	; This gets filled with drive-letters that are assigned using the dl-feature.
2023	;
2024	DriveLetters db LocIPT_MaxPartitions dup (0)
2025	; Format is:
2026	;============
2027	; Drive-Letter : BYTE (80h-C:, 81h-D:)
2028	; --------------------> 1 Byte * 45
2029
2030
2031
2032	; -----------------------------------------------------------------------------
2033	; INSTALL VOLUME
2034	; -----------------------------------------------------------------------------
2035
2036	;
2037	; Allways have the name of the installation volume
2038	; at this offset.
2039	; So future config changes will not break auto-install.
2040	;
2041	; BOOKMARK: Name of OS/2 Installation Volume
2042	ORIGIN 06D00h
2043
2044	; SET(A)BOOT stores the volume name of the OS/2 system being installed here.
2045	; It is truncated to 11 chars because AiR-BOOT currently does not support
2046	; longer labelnames. The name is also capitalized.
2047	OS2_InstallVolume db 0,'NOPHASEONE' ,0
2048
2049	;
2050	; THERE IS ROOM RESERVED HERE FOR MORE VARIABLES
2051	;
2052
2053
2054	; -----------------------------------------------------------------------------
2055	; FLOPPY/CDROM/BIOS BOOT ENTRIES
2056	; -----------------------------------------------------------------------------
2057
2058	;
2059	; 06DABh - 06C00h = 01ABh = 427 bytes.
2060	; Entries allocated down from 06E00 boundary.
2061	;
2062	; BOOKMARK: Floppy/CD-ROM/BIOS Boot Entries
2063	ORIGIN 06DABh ; 427 Boundry
2064
2065	; (432 - 5 = 427)
2066	AutoDrvLetter db 0
2067	AutoDrvLetterSerial dd 0
2068
2069	; This entry is also 34 bytes long (466 - 34 = 432)
2070	BIOScontIPTentry:
2071	db 0, 0, 0, 0, ' '
2072	db 0, 0FEh, Flags_Bootable
2073	dw 0 ; No Checksum :)
2074	db 0, 1, 0
2075	db 0, 1, 0 ; Location of Partition/Boot Record
2076	dd 0, 0
2077
2078	; VIR variables are for the AiR-BOOT Anti Virus Code
2079	; Most of them are backups of Interrupt Points, so we can check, if a
2080	; stealth virus is on-line, we can intercept its call.
2081	; Normal (non stealth) virus are trapped simply by rereading the MBR sector.
2082	; If a virus is found, we will restore MBR from Sektor 60/62 and stop the
2083	; system from working, so the user has to press reset.
2084	; That's saver than a Reboot.
2085	;
2086	; If a virus is found on the partition to boot, the system will ONLY halt,
2087	; nothing more, because we can not remove it. The user shall do it :)
2088	; Those viruses are detected via a real nasty method...Checksum-Checking of the
2089	; boot-record, which is to be executed. If it does not match the one in our
2090	; internal partition table, we will stop. You may however switch this detection
2091	; off or just reset it by switching 'VIBR Detection'.
2092
2093	; 478 - 12 = 466 ; 466 Sub-Part
2094	CFG_VIR_INT08 dd 0 ; pointer to saved 08h entry point
2095	CFG_VIR_INT13 dd 0 ; pointer to saved 13h entry point
2096	CFG_VIR_INT1C dd 0 ; pointer to saved 1Ch entry point
2097
2098	; 478 Boundry (512-34)
2099	; This entry is also 34 bytes long
2100	FloppyIPTentry db 0, 0, 0, 0, 'FloppyDrive'
2101	db 0, 0FFh, Flags_Bootable
2102	dw 0 ; No Checksum :)
2103	db 0, 1, 0
2104	db 0, 1, 0 ; Location of Partition/Boot Record
2105	dd 0, 0
2106
2107
2108
2109	; -----------------------------------------------------------------------------
2110	; INTERNAL PARTITION TABLE (IPT)
2111	; -----------------------------------------------------------------------------
2112
2113	;
2114	; AiR-BOOT Internal Partition Table (IPT)
2115	;
2116	; BOOKMARK: Internal Partition Table
2117	ORIGIN % (image_size - 0a00h - (image_size - image_size_60secs))
2118
2119
2120	;
2121	; Rousseau: This is the start of the AiR-BOOT IPT
2122	;
2123	PartitionTable db (LocIPT_MaxPartitions * LocIPT_LenOfIPT) dup (0)
2124	; no-partitions detected... :]
2125	; db 1, 0, 0, 0, 'Harddisc 1'
2126	; db 0, 0FFh, Flags_BootAble
2127	; dw 0 ; No Checksum :)
2128	; db 0, 0, 1
2129	; db 0, 0, 1 ; Location of Partition/Boot Record
2130	; dd 0, 0
2131
2132	; Format is:
2133	;============
2134	; SerialNumber * 4
2135	; PartitionName * 11
2136	; Drive * 1
2137	; SystemID * 1 (means the partition type)
2138	; Flags * 1
2139	; Checksum * 2 (for virus checking)
2140	; LocationBegin * 3 (where the partition begins)
2141	; LocationPartTab * 3 (where the partition table is)
2142	; AbsoluteBegin * 4 (where the partition begins, in absolute sectors)
2143	; AbsolutePartTab * 4 (where the partition table is, in absolute sectors)
2144	; --------------------> 34 Bytes (total maximum partition-entries = 30)
2145
2146
2147
2148	; No need to check overlap here because this string will
2149	; be overwritten if the maximum partition count is reached.
2150	; So this is not a critical boundary.
2151	ORG (image_size - 600h - (image_size - image_size_60secs) / 2 - 10)
2152
2153	db 'AiRBOOTPAR' ; 1K internal partition table
2154
2155
2156
2157	; -----------------------------------------------------------------------------
2158	; HIDDEN PARTITION TABLE (HPT)
2159	; -----------------------------------------------------------------------------
2160
2161	;
2162	; Hidden Partition Table (6-bit packed as of v1.0.8)
2163	;
2164	; BOOKMARK: Hidden Partition Table (packed)
2165	ORIGIN % (image_size - 600h - (image_size - image_size_60secs) / 2)
2166
2167	HidePartitionTable db (LocIPT_MaxPartitions * LocHPT_LenOfHPT) dup (0FFh)
2168	; Format is:
2169	;============
2170	; PartitionPtr : BYTE * 30
2171	; --------------------> 30 Bytes * 45
2172
2173	;
2174	; Driveletters were here.
2175	; Moved down to make room for packed hideparttable.
2176	;
2177
2178
2179	;
2180	; End of hidden partition table.
2181	; Check overlap here for security reasons.
2182	;
2183	ORIGIN % (image_size - 200h - 5)
2184
2185	; 79fa - end of packed hide table
2186	db 'ABHID' ; 1K internal Hide-partition table
2187
2188
2189
2190
2191	;==============================================================================
2192	; Sector 62
2193	;==============================================================================
2194	; -----------------------------------------------------------------------------
2195	; MBR BACKUP
2196	; -----------------------------------------------------------------------------
2197
2198	;
2199	; AiR-BOOT MBR Backup.
2200	;
2201	; BOOKMARK: MBR Backup
2202	ORIGIN % (image_size - 200h)
2203
2204
2205	MBR_BackUpMBR db 'AiR-BOOT MBR-BackUp',\
2206	' - Just to fill this sector with something',0
2207	AirBootRocks db 'AiR-BOOT Rocks!',0
2208
2209	db (512 - ($-MBR_BackUpMBR) - 2) dup('M')
2210
2211	; End of Image signature.
2212	;
2213	ORIGIN % (image_size - 2)
2214	dw 0BABEh
2215
2216
2217	;
2218	; End of Image.
2219	;
2220	ORIGIN % (image_size)
2221	image_end:
2222
2223	;
2224	; Terminate LDRIMAGE segment.
2225	;
2226	IFDEF SEGMENTED
2227	LDRIMAGE ENDS
2228	ENDIF
2229
2230
2231
2232
2233
2234
2235
2236	;##############################################################################
2237	; BSS SEGMENT
2238	;##############################################################################
2239
2240	; BOOKMARK: BSS Segment
2241
2242	;
2243	; Open BSS segment.
2244	;
2245	IFDEF SEGMENTED
2246	VOLATILE SEGMENT USE16 PUBLIC 'BSS'
2247	ENDIF
2248
2249
2250
2251	sobss:
2252	sobss_abs = offset sobss + image_size
2253	;------------------------------------------------------------------------------
2254
2255
2256	;
2257	; This is the actual start of the BSS.
2258	; In the past however, we have had a code-loop that went out of bounds,
2259	; overwriting the start of the BSS.
2260	;
2261	; Because important runtime data is stored in the BSS, we offset it
2262	; by 400h bytes. Since the loader-image is always 62 sectors, which
2263	; makes it 7c00h in size, the runtime data starts at 8000h.
2264	; This is the 'BeginOfVariables' location.
2265	;
2266
2267
2268	;
2269	; If segmented, offsets are relative to the BSS segment.
2270	; They are resolved at link-time.
2271	; If not segmented, offsets are relative to the CODE segment.
2272	;
2273	IFDEF SEGMENTED
2274	ORG 00400h ; 7c00h + 400h = 8000h
2275	ELSE
2276	ORG 08000h ; 8000h
2277	ENDIF
2278
2279
2280	; -----------------------------------------------------------------------------
2281	; START OF BSS DATA
2282	; -----------------------------------------------------------------------------
2283	; This space actually gets initialized in PreCrap to NUL (till EndOfVariables)
2284	BeginOfVariables:
2285	BeginOfVariablesAbs = offset BeginOfVariables + image_size
2286
2287
2288	; -----------------------------------------------------------------------------
2289	; SECTOR BUFFERS
2290	; -----------------------------------------------------------------------------
2291	; BOOKMARK: Sector Buffers
2292	PartitionSector db 512 dup (?) ; Temporary Sector for Partition
2293	PBRSector db 512 dup (?) ; Temporary Sector for JFS/HPFS writeback
2294	LVMSector db 512 dup (?) ; Temporary Sector for LVM
2295	TmpSector db 512 dup (?) ; Temporary Sector
2296	Scratch db 512 dup (?) ; Scratch buffer
2297	ALIGN 16
2298
2299
2300	; -----------------------------------------------------------------------------
2301	; NEW PARTITION TABLE
2302	; -----------------------------------------------------------------------------
2303	; Everything used to build a new IPT and reference it to the old one
2304	; BOOKMARK: New Partition Table
2305	NewPartTable db 1536 dup (?) ; New Partition Table
2306	ALIGN 16
2307
2308
2309	; -----------------------------------------------------------------------------
2310	; NEW HIDE PARTITION TABLE
2311	; -----------------------------------------------------------------------------
2312	; BOOKMARK: New Hide-Partition Table
2313	NewHidePartTable db LocIPT_MaxPartitions * LocHPT_LenOfHPT dup (?)
2314	ALIGN 16
2315
2316
2317	; -----------------------------------------------------------------------------
2318	; NEW DRIVE LETTERS
2319	; -----------------------------------------------------------------------------
2320	; BOOKMARK: Logical Drive-Letters
2321	NewDriveLetters db LocIPT_MaxPartitions dup (?)
2322	ALIGN 16
2323
2324
2325	; -----------------------------------------------------------------------------
2326	; PARTITION SIZE TABLE
2327	; -----------------------------------------------------------------------------
2328	; Size-Table (6 bytes per partition)
2329	; BOOKMARK: Partition Size Table
2330	PartitionSizeTable db LocIPT_MaxPartitions * 6 dup (?)
2331	ALIGN 16
2332
2333
2334	; -----------------------------------------------------------------------------
2335	; PARTITION POINTERS
2336	; -----------------------------------------------------------------------------
2337	; Maximum is 52 word entries till now
2338	; BOOKMARK: Partition Pointers
2339	PartitionPointers dw 52 dup (?)
2340	ALIGN 16
2341
2342	; Count of total Partition Pointers
2343	PartitionPointerCount db ?
2344	ALIGN 16
2345
2346
2347	; -----------------------------------------------------------------------------
2348	; XREF TABLE
2349	; -----------------------------------------------------------------------------
2350	; X-Reference Table (holds new partnr, index is old part nr)
2351	; BOOKMARK: Xref Table
2352	PartitionXref db LocIPT_MaxPartitions dup (?)
2353	ALIGN 16
2354
2355
2356	; -----------------------------------------------------------------------------
2357	; VOLUME LETTERS
2358	; -----------------------------------------------------------------------------
2359	; Volume-Letters
2360	; 0 - no LVM support
2361	; 1 - LVM support, but no letter
2362	; 'C'-'Z' - assigned drive letter
2363	; BOOKMARK: Volume Drive Letters
2364	PartitionVolumeLetters db LocIPT_MaxPartitions dup (?)
2365	ALIGN 16
2366
2367
2368	; -----------------------------------------------------------------------------
2369	; MISC VARS AND FLAGS
2370	; -----------------------------------------------------------------------------
2371	; BOOKMARK: Misc Vars and Flags
2372	TotalHarddiscs db ? ; Total harddrives (by POST)
2373	LBASwitchTable db 128 dup (?) ; Bit 25-18 for CHS/LBA Switching
2374	NewPartitions db ? ; Freshly found partitions
2375	; Independent of SaveConfiguration
2376	TooManyPartitions db ? ; Non-zero if too many partitions found
2377
2378	VideoIO_Segment dw ? ; Segment for Video I/O
2379
2380	ExtendedAbsPos dd ? ; Extended Partition Absolute Position
2381	ExtendedAbsPosSet db ? ; If Absolute Position set
2382
2383	CurPartition_Location dw 4 dup (?) ; Where did current partition come from?
2384	CurIO_UseExtension db ? ; 1-Use INT 13h EXTENSIONS
2385	; (filled out by PreCrap)
2386	CurIO_Scanning db ? ; 1-AiR-BOOT is scanning partitions
2387	; (for detailed error message)
2388	ALIGN 16
2389
2390
2391	; -----------------------------------------------------------------------------
2392	; MENU RELATED VARS
2393	; -----------------------------------------------------------------------------
2394	Menu_EntrySelected db ? ; Which partition we boot this time...
2395	Menu_UpperPart db ? ; Which number (Base=0) is the partition upper pos
2396	Menu_AbsoluteX db ? ; Pos where Menu stuff starts
2397	Menu_TotalParts db ? ; Copy of CFG_BootParts
2398	Menu_TotalLines db ? ; Total Lines on Screen used for BootMenu
2399	Menu_EntryDefault db ? ; Default Entry in filtered View
2400	Menu_EntryLast db ? ; LastBooted Entry in filtered View
2401	Menu_EntryAutomatic db ? ; Automatic Entry in filtered View
2402	; - All adjusted to menu locations
2403	ALIGN 16
2404
2405
2406	; -----------------------------------------------------------------------------
2407	; PARTITION RELATED VARS
2408	; -----------------------------------------------------------------------------
2409	PartSetup_UpperPart db ? ; Partition-Setup (like Menu_UpperPart)
2410	PartSetup_ActivePart db ? ; Active Partition
2411	PartSetup_HiddenUpper db ? ; (like Menu_UpperPart)
2412	PartSetup_HiddenX db ? ; Pos for Hidden-Setup
2413	PartSetup_HiddenAdd db ? ; Adjust for Hidden-Setup
2414	ALIGN 16
2415
2416
2417	; -----------------------------------------------------------------------------
2418	; TIMER / SETUP RELATED VARS
2419	; -----------------------------------------------------------------------------
2420	TimedBootEnable db ? ; Local Enable/Disable for timed boot
2421	TimedTimeOut dd ? ; TimeOut Timer for TimedBoot (too much time here;)
2422	TimedSecondLeft db ? ; How many seconds are left till boom ?
2423	TimedSecondBack db ? ; To get a modification noticed
2424	TimedBootUsed db ? ; Timed Boot used for bootup ?
2425	FloppyGetNameTimer dd ? ; Timer for Floppy-Get-Name
2426	SETUP_KeysOnEntry db ? ; which Shift Status was there, when booting ?
2427	SETUP_ExitEvent db ? ; Exit Event to end SETUP
2428	TempPasswordEntry db 17 dup (?)
2429	SETUP_OldPwd db 17 dup (?)
2430	SETUP_NewPwd db 17 dup (?)
2431	SETUP_VerifyPwd db 17 dup (?)
2432	StartSoundPlayed db ?
2433	ChangePartNameSave db ? ; Save label after user-edit ?
2434	SyncLvmLabels db ? ; Sync LVM labels after user-edit ?
2435	ALIGN 16
2436
2437
2438	; -----------------------------------------------------------------------------
2439	; FX RELATED VARS
2440	; -----------------------------------------------------------------------------
2441	FX_UseCount dw ?
2442	FX_OverallTimer dw ?
2443	FX_WideScrollerTimer dw ?
2444	FX_WideScrollerCurPos dw ?
2445	FX_WideScrollerSpeed db ?
2446	FX_WideScrollerSpeedState db ?
2447	FX_WideScrollerDirection db ?
2448	FX_WideScrollerAbsDirection db ?
2449	FX_WideScrollerBounceSpeed db ?
2450	FX_CooperBarsTimer dw ?
2451	ALIGN 16
2452
2453	; Dynamically Generated Tables - do not need to get initialized with NUL
2454	FX_CooperColors db 672 dup (?) ; 7 cooper bars*96 - runtime calculated
2455	FX_CooperState db 7 dup (?)
2456	FX_SinusPos db 7 dup (?)
2457	FX_CooperPos dw 7 dup (?)
2458	ALIGN 16
2459
2460
2461	; -----------------------------------------------------------------------------
2462	; CHARSET BUFFER
2463	; -----------------------------------------------------------------------------
2464	CharsetTempBuffer db 4096 dup (?) ; Uninitialized Charset buffer
2465	ALIGN 16
2466
2467
2468	; -----------------------------------------------------------------------------
2469	; LVM CRC TABLE
2470	; -----------------------------------------------------------------------------
2471	LVM_CRCTable dd 256 dup (?) ; LVM-CRC (->SPECiAL\LVM.asm)
2472	ALIGN 16
2473
2474
2475	; -----------------------------------------------------------------------------
2476	; LVM DRIVE-LETTER MAP
2477	; -----------------------------------------------------------------------------
2478	; Get's initialized at startup to: 00000011111111111111111111111100b
2479	; Meaning A,B not free; C-Z free, rest unused. (right to left)
2480	; Each partition with an assigned drive-letter clears a bit in this map.
2481	FreeDriveletterMap dd ?
2482	ALIGN 16
2483
2484
2485	; -----------------------------------------------------------------------------
2486	; OS/2 PHASE1 RELATED
2487	; -----------------------------------------------------------------------------
2488	Phase1Active db ?
2489	OldPartitionCount db ?
2490	ALIGN 16
2491
2492
2493	; -----------------------------------------------------------------------------
2494	; ARRAY OF DISK INFORMATION STRUCTURES
2495	; -----------------------------------------------------------------------------
2496	; Array of DISKINFO structures
2497	DiskInformation db MaxDisks dup(DISKINFO_Size dup(?))
2498	ALIGN 16
2499
2500
2501	; -----------------------------------------------------------------------------
2502	; INT13X DAP
2503	; -----------------------------------------------------------------------------
2504	; Disk Address Package that holds information for LBA-access using INT13X
2505	INT13X_DAP db ? ; Size of paket, inserted by code
2506	db ? ; Reserved
2507	INT13X_DAP_NumBlocks dw ? ; Number of blocks
2508	INT13X_DAP_Transfer dd ? ; Transfer Adress
2509	INT13X_DAP_Absolute dd ? ; Absolute Sector
2510	dd ? ; Second Part of QWORD
2511	INT13X_DAP_Size = $-offset [INT13X_DAP] ; Calculated size
2512	ALIGN 16
2513
2514
2515	; -----------------------------------------------------------------------------
2516	; DEBUG
2517	; -----------------------------------------------------------------------------
2518	; Some debug area.
2519	dbg_scratch db 512 dup(?)
2520	ALIGN 16
2521
2522
2523	; End of transient variables.
2524	EndOfVariables:
2525	EndOfVariablesAbs = offset EndOfVariables + image_size
2526
2527
2528
2529	; -----------------------------------------------------------------------------
2530	; OLD AND NEW STACKS
2531	; -----------------------------------------------------------------------------
2532	; BOOKMARK: Storage for Old and New Stack Pointers
2533	;
2534	; These need to be outside the variable section because AiR-BOOT can restart
2535	; itself in debug-mode. If the OldSP and OldSS would be in the variable area,
2536	; they would be cleared on AiR-BOOT restart.
2537	;
2538
2539	; The variable section is cleared word-wise, so it could clear one byte extra
2540	; depending on the alignment and size. This DD prevents the OldSP and OldSS
2541	; to be partly overwritten by the clearing routine.
2542	dd ?
2543	ALIGN 16
2544
2545	; SS:SP from before our relocation.
2546	; The registers values when the BIOS transferred control to us were pushed
2547	; on this stack.
2548
2549	OldSP dw ?
2550	OldSS dw ?
2551
2552	; SS:SP currently in use.
2553	; They are temporarily dumped here so we can pop the resgisters from
2554	; the old stack to display them in debug mode.
2555	CurrentSP dw ?
2556	CurrentSS dw ?
2557	ALIGN 16
2558
2559	; Usually, commits are buildable and some minor checking has been done that
2560	; whole disks do not get wiped. However, there are situations where stuff is
2561	; in such a flux that it would be better to do non-buildable commits.
2562	; That makes it possible to record the changes piecemeal without the danger of
2563	; accidently using the resulting loader. Of course everyone is clever enough
2564	; to _never_ build commits marked as 'testing' and install the result in
2565	; environments where wiping all attached disks and sticks would be a problem...
2566	force_build_error dd 0f000h dup(?)
2567
2568	;
2569	; End of BSS segment.
2570	;
2571	eobss:
2572	eobss_abs = offset eobss + image_size
2573	;
2574	; Total RAM occupied, including BSS.
2575	; BASE is 8000:0000, LIMIT is 8000:FFFF.
2576	; Note that the LDRIMAGE is of constant size, 7C00h = 62 sectors of 512 bytes.
2577	;
2578	resident_size = offset eobss + image_size
2579
2580	;
2581	; Close BSS segment.
2582	;
2583	IFDEF SEGMENTED
2584	VOLATILE ENDS
2585	ELSE
2586	LDRIMAGE ENDS
2587	ENDIF
2588
2589	; BOOKMARK: End of Module
2590	END AiR_BOOT
2591

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