source: trunk/bootcode/airboot.asm@ 141

Last change on this file since 141 was 141, checked in by Ben Rietbroek, 8 years ago

Moved the clearing of BSS variables to an earlier stage [v1.1.1-testing]

When debugging, we want 'AuxIO' available before 'PRECRAP'.

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: 95.6 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;
36include ../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;
42include bldlevel.inc
43
44;
45; Include some macro's.
46; This file contains the ORIGIN macro that is used to detect overlaps.
47;
48include ../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)
60IFDEF TASM
61 ;~ JUMPS
62ENDIF
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;
83AUX_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;
92IFNDEF AUX_DEBUG
93FX_ENABLED EQU
94ENDIF
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
113AUX_INIT_PARMS EQU 11100011b
114
115; Com-port for debugging, 0 is disabled
116BIOS_COM_PORT EQU 1
117
118; Default word value for BIOS_AuxParms variable
119; Note that is has moved since v1.07
120BIOS_AUXPARMS_DEFAULT EQU (AUX_INIT_PARMS SHL 8) OR BIOS_COM_PORT
121
122; Default byte value for BIOS_BootDisk variable
123BIOS_BOOTDISK_DEFAULT EQU 80h
124
125
126
127; -----------------------------------------------------------------------------
128; LABELS
129; -----------------------------------------------------------------------------
130; Address labels after code-move
131BootBaseSeg equ 08000h ; Pre-boot, in the low 640K
132BootBasePtr equ 0h ; We put our MBR to this location
133BootBaseExec equ BootBasePtr+offset MBR_RealStart
134StackSeg equ 07000h ; Put the stack below the code
135StartBaseSeg equ 00000h ; Pre-boot, we are in low memory
136StartBasePtr 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.
144VideoIO_Page0 equ 0B800h
145VideoIO_Page1 equ 0B900h
146VideoIO_Page2 equ 0BA00h
147VideoIO_Page4 equ 0BC00h
148VideoIO_FXSegment equ 0A000h
149
150; Special line-drawing characters
151TextChar_WinLineRight equ 0C4h
152TextChar_WinLineDown equ 0B3h
153TextChar_WinRep1 equ 0D1h
154TextChar_WinRep2 equ 0C5h
155TextChar_WinRep3 equ 0CFh
156TextChar_WinRep4 equ 0B5h
157TextChar_WinRep5 equ 0C6h
158TextChar_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
167LocDISKINFO_DiskNum equ 00h ; BYTE - BIOS disk number (80h etc)
168LocDISKINFO_MbrFlags equ 01h ; BYTE - Valid MBR, etc
169
170; BIOS INT13 Info
171LocDISKINFO_I13_Secs equ 02h ; WORD - Max 63
172LocDISKINFO_I13_Heads equ 04h ; WORD - Max 16 or 255
173LocDISKINFO_I13_Cyls equ 06h ; WORD - Max 1024
174
175; BIOS INT13X Info
176LocDISKINFO_I13X_Flags equ 08h ; WORD - CHS valid, etc
177LocDISKINFO_I13X_SecSize equ 0ah ; WORD - Normally 512 bytes
178LocDISKINFO_I13X_Secs equ 0ch ; DWORD - Max 63 ?
179LocDISKINFO_I13X_Heads equ 10h ; DWORD - Max 255 ?
180LocDISKINFO_I13X_Cyls equ 14h ; DWORD - Max 2_32 (4294967296)
181LocDISKINFO_I13X_SecsLBA equ 18h ; QWORD - Max 2^64 (4294967296^2)
182LocDISKINFO_I13X_HostBus equ 20h ; 4 bytes
183LocDISKINFO_I13X_Interface equ 24h ; 8 bytes
184
185; OS/2 LVM Info
186LocDISKINFO_LVM_Flags equ 2ch ; WORD - OS/2 ext geo, etc
187LocDISKINFO_LVM_MasterLBA equ 2eh ; DWORD - Max 254
188LocDISKINFO_LVM_Secs equ 32h ; DWORD - Max 255
189LocDISKINFO_LVM_Heads equ 36h ; DWORD - Max 255
190LocDISKINFO_LVM_Cyls equ 3ah ; DWORD - Max 65536
191
192; Custom Info
193LocDISKINFO_Flags equ 3eh ; WORD - Custom flags, dunno yet
194
195; Size of this structure
196DISKINFO_Size equ 40h ; Size to be allocated
197
198
199; -----------------------------------------------------------------------------
200; PARTITION TABLE
201; -----------------------------------------------------------------------------
202; Offsets for Partition-Entries in MBR/EBRs
203LocBRPT_LenOfEntry equ 16 ; Length of a standard MBR or EPR entry
204LocBRPT_Flags equ 0 ; Bootable, Hidden, etc.
205LocBRPT_BeginCHS equ 1 ; Packed CHS value
206LocBRPT_BeginHead equ 1 ; Start head, usually < 16
207LocBRPT_BeginSector equ 2 ; Start sector, max 63 + cyl high bits
208LocBRPT_BeginCylinder equ 3 ; Start cylinder 8+2 bits, max 1023
209LocBRPT_SystemID equ 4 ; Type of system using the partition
210LocBRPT_EndCHS equ 5 ; Packed CHS value
211LocBRPT_EndHead equ 5 ; End head, usually < 16
212LocBRPT_EndSector equ 6 ; End sector, max 63 + cyl high bits
213LocBRPT_EndCylinder equ 7 ; End cylinder 8+2 bits, max 1023
214LocBRPT_RelativeBegin equ 8 ; LBA32 address of partition
215LocBRPT_AbsoluteLength equ 12 ; 32-bit length of partition
216
217; Signature relative to start of MBR/EBR
218LocBR_Magic equ 510 ; Offset of 0AA55h signature
219
220
221; -----------------------------------------------------------------------------
222; LVM RECORD
223; -----------------------------------------------------------------------------
224; Used as a quick compare in LVM.ASM
225LocLVM_SignatureByte0 equ 02h
226
227; Offsets for LVM Information Sector.
228; These are relative to the start of the LVM sector.
229LocLVM_SignatureStart equ 00h ; 02h,'RMBPMFD' (8 bytes)
230LocLVM_CRC equ 08h ; CRC is a DWORD
231LocLVM_Heads equ 1ch ; Number of heads
232LocLVM_Secs equ 20h ; Sectors per Track
233LocLVM_DiskName equ 24h ; Name of the disk
234LocLVM_StartOfEntries equ 3ch ; (contains maximum of 4 entries)
235LocLVM_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.
242LocLVM_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.
250LocLVM_VolumeID equ 00h ; DWORD
251LocLVM_PartitionID equ 04h ; DWORD
252LocLVM_PartitionSize equ 08h ; DWORD
253LocLVM_PartitionStart equ 0ch ; DWORD
254LocLVM_OnBootMenu equ 10h ; is on IBM BM Bootmenu
255LocLVM_Startable equ 11h ; is Startable (newly installed system)
256LocLVM_VolumeLetter equ 12h ; Drive Letter for partition (C-Z or 0)
257LocLVM_Unknown equ 13h ; unknown BYTE (can be used ?)
258LocLVM_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.
265LocLVM_VolumeName equ 14h ; 20 bytes
266LocLVM_PartitionName equ 28h ; 20 bytes (Used in menu)
267
268; LVM constants.
269LocLVM_LabelLen equ 14h ; Length of LVM Label (Disk/Part/Vol)
270LocLVM_DiskNameLen equ 14h ; Length of LVM DiskName
271LocLVM_VolumeNameLen equ 14h ; Length of LVM VolumeName
272LocLVM_PartitionNameLen equ 14h ; Length of LVM PartitionName
273
274
275; -----------------------------------------------------------------------------
276; AiR-BOOT IPT
277; -----------------------------------------------------------------------------
278; Offsets for IPT (Internal Partition Table)
279LocIPT_MaxPartitions equ max_partitions ; 45 in v1.07+
280LocIPT_LenOfSizeElement equ 6 ; Size of one Size-Element
281LocIPT_LenOfIPT equ 34 ; Length of an IPT-entry
282LocIPT_Serial equ 0 ; Serial from MBR ?
283LocIPT_Name equ 4 ; Name from FS or LVM (part/vol)
284LocIPT_Drive equ 15 ; Drive-ID (80h,81h)
285LocIPT_SystemID equ 16 ; Partition-Type (06,07,etc)
286LocIPT_Flags equ 17 ; AiR-BOOT Flags for part (see below)
287LocIPT_BootRecordCRC equ 18 ; CRC of Boot-Record
288LocIPT_LocationBegin equ 20 ; Begin of Partition
289LocIPT_LocationPartTable equ 23 ; PartitionTable of Partition
290LocIPT_AbsoluteBegin equ 26 ; Absolute Sector of Begin
291LocIPT_AbsolutePartTable equ 30 ; Absolute Sector of PartTable
292
293
294; AiR-BOOT IPT-Flags
295LocIPT_DefaultFlags equ 00000011b ; Don't know if boot-able :)
296LocIPT_DefaultNonBootFlags equ 00000010b ; VIBR Detection is always on
297
298Flags_Bootable equ 00000001b
299Flags_VIBR_Detection equ 00000010b
300Flags_HideFeature equ 00000100b
301Flags_DriveLetter equ 00001000b ; OS/2 FAT16/HPFS only
302Flags_ExtPartMShack equ 00010000b ; Ext. Partition M$-Hack req ?
303Flags_NoPartName equ 01000000b
304Flags_NowFound equ 10000000b ; temp only in OldPartTable
305Flags_SpecialMarker equ 10000000b ; temp only for HiddenSetup
306
307FileSysFlags_BootAble equ 00000001b ; Is this Partition boot-able ?
308FileSysFlags_FAT32 equ 00010000b ; FAT 32 specific name getting
309FileSysFlags_NoName equ 00100000b ; No Name - use PartitionName
310FileSysFlags_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 !
320LocHPT_LenOfHPT equ 34
321
322
323; -----------------------------------------------------------------------------
324; NAVIGATION KEYS
325; -----------------------------------------------------------------------------
326; Navigation keys
327Keys_Up equ 48h
328Keys_Down equ 50h
329Keys_Left equ 4Bh
330Keys_Right equ 4Dh
331Keys_PageUp equ 49h
332Keys_PageDown equ 51h
333Keys_GrayPlus equ 4Eh
334Keys_GrayMinus equ 4Ah
335Keys_Plus equ 1Bh
336Keys_Minus equ 35h
337Keys_ENTER equ 1Ch
338Keys_ESC equ 1h
339Keys_F1 equ 3Bh
340Keys_F10 equ 44h
341Keys_C equ 2Eh ; Add. Check for Ctrl!
342Keys_Y equ 2Ch
343Keys_Z equ 15h
344Keys_N equ 31h
345Keys_TAB equ 0Fh
346Keys_Delete equ 53h
347Keys_Backspace equ 0Eh
348Keys_Space equ 20h
349
350Keys_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)
360InitialFreeDriveletterMap 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;
368MaxDisks 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;
401IFDEF TASM
402 ;~ .model large, basic
403 .model tiny,c
404ENDIF
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;
420SEGMENTED 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; ######################################################
486AiR_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;
521MBR_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;
602MBR_HaltSystem:
603 mov ax, 8600h
604 xor cx, cx
605 mov dx, 500
606 int 15h ; Wait to display the whole screen :]
607MBR_HaltSys:
608 ;~ cli
609 jmp MBR_HaltSys
610
611
612 ; Base of some MBR variables
613 ORIGIN 0003Ch
614
615MBR_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'.
621BIOS_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.
628BIOS_BootDisk db BIOS_BOOTDISK_DEFAULT ; Get overwritten with 'DL'
629
630; Reserved space for future variables.
631IFDEF AUX_DEBUG
632reserved db 5 dup('X')
633ELSE
634reserved db 5 dup(0)
635ENDIF
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
662MBR_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
669MBR_LoadError EndP
670
671;
672; Entry-point when saving fails.
673;
674 db 'SAVE ERROR!', 0
675MBR_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
682MBR_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
689MBR_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
700MBR_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)
710MBR_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
722MBR_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;------------------------------------------------------------------------------
743MBR_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;------------------------------------------------------------------------------
857include 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;
914FurtherMoreLoad:
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'
927FileSysIDs 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
940FileSysNames 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)
981AiR_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; Verify we still got the BIOS disk in DL
1009IFDEF AUX_DEBUG
1010 IF 1
1011 DBG_TEXT_OUT_AUX '## AiR_BOOT_Start ##'
1012 PUSHRF
1013 call DEBUG_DumpRegisters
1014 POPRF
1015 ENDIF
1016ENDIF
1017
1018
1019; -----------------------------------------------------------------------------
1020; IBM-BM BOOT PREPARATION
1021; -----------------------------------------------------------------------------
1022 ;
1023 ; Since v1.0.8, AiR-BOOT is able to chainload IBM-BM.
1024 ; When IBM-BM resides above the 1024-cylinder limit, the 'I13X'
1025 ; signature is required at 3000:0000, FS needs to contain 3000h
1026 ; and the 32-bit LBA address needs to follow the 'I13X' signature.
1027 ; For booting IBM-BM from the second disk, a copy of the MBR of the
1028 ; first disk is also required at 0000:7E00.
1029 ; This information is derived from the eCS 2.x LVM MBR.
1030 ;
1031 ; So, now is a good time to copy the MBR of the first disk to
1032 ; 0000:7E00 in case the partition that will be started is IBM-BM.
1033 ; This copy is located at 8000:0000 and DS already points to this
1034 ; segment. The 'I13X' signature and FS will be setup later.
1035 ;
1036 pusha ; Save all the general purpose regs
1037 push es ; We need ES too, so save its value
1038 xor ax,ax ; Segment 0000h
1039 mov es,ax ; Make ES point to it
1040 mov si,offset BootBasePtr ; Start of AiR-BOOT which has the MBR
1041 mov di,7e00h ; Destination for the MBR for IBM-BM
1042 mov cx,100h ; 256 words = 512 bytes
1043 cld ; Direction from low to high
1044 rep movsw ; Copy the 256 words of the MBR
1045 pop es ; Restore previous value of ES
1046 popa ; Restore all the general purpose regs
1047
1048
1049; -----------------------------------------------------------------------------
1050; PRECRAP
1051; -----------------------------------------------------------------------------
1052
1053 ;
1054 ; First it clears the BSS area.
1055 ; Note that the old SS:SP is stored outside this area so this
1056 ; does not get lost.
1057 ; Then initialize various runtime variables and structures.
1058 ;
1059 ; BOOKMARK: Pre Crap
1060 call PRECRAP_Main
1061 ; Number of harddisks and other system-info is now known.
1062
1063;!
1064;! DEBUG_BLOCK
1065;! Let's see what the BIOS supplied us with...
1066;! Uncomment below to activate.
1067;!
1068IFDEF AUX_DEBUG
1069 IF 0
1070 pushf
1071 pusha
1072
1073 ; Print title.
1074 mov si,offset [bios_reg]
1075 call AuxIO_Print
1076 ; Save the current stack (SS:SP).
1077 mov ax,ss
1078 mov [CurrentSS],ax
1079 mov [CurrentSP],sp
1080
1081 ; Restore the old stack.
1082 mov ss,[OldSS]
1083 mov sp,[OldSP]
1084
1085 ; Pop the registers with the BIOS values.
1086 popa
1087 ; Push them back for AiR-BOOT restart (debug mode).
1088 pusha
1089 ; Dump them to the serial-port.
1090 call DEBUG_DumpRegisters
1091 ; Restore the current stack.
1092 mov ax,[CurrentSS]
1093 mov ss,ax
1094 mov sp,[CurrentSP]
1095
1096 popa
1097 popf
1098 ENDIF
1099ENDIF
1100
1101
1102;!
1103;! DEBUG_BLOCK
1104;! Dump the registers at this point.
1105;!
1106IFDEF AUX_DEBUG
1107 IF 0
1108 pushf
1109 pusha
1110 ;~ call DEBUG_DumpRegisters
1111 ;~ call DEBUG_DumpDriveLetters
1112 ;~ call DEBUG_DumpVolumeLetters
1113 ;~ call DEBUG_DumpPartitionXref
1114 popa
1115 popf
1116 ENDIF
1117ENDIF
1118
1119; -----------------------------------------------------------------------------
1120; PARTITION SCAN
1121; -----------------------------------------------------------------------------
1122
1123
1124
1125
1126
1127
1128 ;
1129 ; BOOKMARK: Scan all partitions
1130 ;
1131 call PARTSCAN_ScanForPartitions
1132 ; Internal Partition Table is now populated.
1133
1134;!
1135;! DEBUG_BLOCK
1136;! Dump various tables.
1137;! Uncomment below to activate.
1138;!
1139IFDEF AUX_DEBUG
1140 IF 0
1141 pushf
1142 pusha
1143 ;~ call DEBUG_DumpIPT
1144 ;~ call DEBUG_DumpPartitionPointers
1145 ;~ call DEBUG_DumpNewPartTable
1146 ;~ call DEBUG_DumpDriveLetters
1147 ;~ call DEBUG_DumpDriveLetters
1148 ;~ call DEBUG_DumpVolumeLetters
1149 ;~ call DEBUG_DumpPartitionXref
1150 popa
1151 popf
1152 ENDIF
1153ENDIF
1154
1155
1156; -----------------------------------------------------------------------------
1157; RESTORE FORCED DRIVELETTER CORRELATION [LVM]
1158; -----------------------------------------------------------------------------
1159
1160 ;
1161 ; Reconnect forced drive-letters to their corresponding
1162 ; partitions.
1163 ;
1164 ; BOOKMARK: Update Driveletters so they are in-sync again
1165 call PARTSCAN_UpdateDriveLetters
1166 ; Driveletter <-> Partition correlation is now restored.
1167
1168
1169
1170;!
1171;! DEBUG_BLOCK
1172;! Dump various tables.
1173;!
1174IFDEF AUX_DEBUG
1175 IF 0
1176 pushf
1177 pusha
1178 ;~ call DEBUG_DumpIPT
1179 ;~ call DEBUG_DumpPartitionPointers
1180 ;~ call DEBUG_DumpNewPartTable
1181 ;~ call DEBUG_DumpDriveLetters
1182 ;~ call DEBUG_DumpDriveLetters
1183 ;~ call DEBUG_DumpVolumeLetters
1184 ;~ call DEBUG_DumpPartitionXref
1185 popa
1186 popf
1187 ENDIF
1188ENDIF
1189
1190
1191; -----------------------------------------------------------------------------
1192; SHOW WE ARE ALIVE
1193; -----------------------------------------------------------------------------
1194
1195 ;
1196 ; Put some info about AiR-BOOT and the system on the screen.
1197 ;
1198
1199 ; Display number of physical disks found
1200 mov si, offset DisksFound
1201 call MBR_Teletype
1202 mov al, [TotalHarddiscs]
1203 call VideoIO_SyncPos
1204 call VideoIO_PrintByteDynamicNumber
1205 xor si,si
1206 call MBR_TeletypeNL
1207
1208 ; Display number of partitions found
1209 mov si, offset PartitionsFound
1210 call MBR_Teletype
1211 mov al, [CFG_Partitions]
1212 call VideoIO_SyncPos
1213 call VideoIO_PrintByteDynamicNumber
1214
1215 ; Dump summier disk-info for disks found
1216 xor si,si
1217 call MBR_TeletypeNL
1218 call MBR_TeletypeNL
1219 call VideoIO_SyncPos
1220 mov dl,80h
1221 call VideoIO_DumpDiskInfo
1222
1223
1224
1225
1226
1227; -----------------------------------------------------------------------------
1228; eComStation PHASE1 CHECK
1229; -----------------------------------------------------------------------------
1230
1231 ;
1232 ; BOOKMARK: Check for OS/2 being installed
1233 ; Here we check if OS/2 is being installed.
1234 ; If so, we forgo the menu and directly boot it.
1235 ;
1236
1237 ; If the first byte of the name of the Install Volume is not 0
1238 ; then we potentially have a phase1 boot.
1239 test byte ptr [OS2_InstallVolume],0ffh
1240 ; Nope, so continue normally.
1241 jz MBR_Main_ContinueBoot
1242
1243 ; Setup phase1.
1244 ; It is still possible that a name was set for the
1245 ; Install Volume that does not exist.
1246 ; In that case CY will be clear and AL=0FFh.
1247 call PART_SetupPhase1
1248 ; Oops, Install Volume not found, continue normally.
1249 jnc MBR_Main_ContinueBoot
1250
1251
1252 ;
1253 ; == Install Volume Found ==
1254 ;
1255
1256
1257;!
1258;! DEBUG_BLOCK
1259;! Dump various tables.
1260;!
1261IFDEF AUX_DEBUG
1262 IF 0
1263 pushf
1264 pusha
1265 ;~ call DEBUG_DumpIPT
1266 ;~ call DEBUG_DumpPartitionPointers
1267 ;~ call DEBUG_DumpPartitionXref
1268 ;~ call DEBUG_DumpNewPartTable
1269 ;~ call DEBUG_DumpDriveLetters
1270 popa
1271 popf
1272 ENDIF
1273ENDIF
1274
1275
1276 ; BOOKMARK: Scan for Partitions (Only if OS/2 install going on)
1277 ; Because one or more partitions are possibly added, the
1278 ; PartitionXref table is not 'in sync' and could cause the
1279 ; wrong system to be automatically booted.
1280 ; So we rescan all partitions causing the PartitionXref
1281 ; table to be filled with correct values so the auto-boot
1282 ; from the new partition will work correctly.
1283 call PARTSCAN_ScanForPartitions
1284
1285
1286;!
1287;! DEBUG_BLOCK
1288;! Dump various tables.
1289;!
1290IFDEF AUX_DEBUG
1291 IF 0
1292 pushf
1293 pusha
1294 ;~ call DEBUG_DumpIPT
1295 ;~ call DEBUG_DumpPartitionPointers
1296 ;~ call DEBUG_DumpPartitionXref
1297 ;~ call DEBUG_DumpNewPartTable
1298 ;~ call DEBUG_DumpDriveLetters
1299 popa
1300 popf
1301 ENDIF
1302ENDIF
1303
1304 ; Setup automatic boot to forgo the Menu.
1305 ; PART_SetupPhase1 has filled in the other variables.
1306 mov byte ptr [CFG_AutomaticBoot],1
1307
1308 ;
1309 ; At this point the AiR-BOOT configuration has been altered
1310 ; to automatically boot the newly installed system without
1311 ; displaying the menu.
1312 ; Code further down the road will take care of that.
1313 ;
1314 jmp MBR_Main_ContinueBoot
1315
1316
1317
1318
1319 ;
1320 ; Wether a new system is being installed or not,
1321 ; booting continues here.
1322 ;
1323 MBR_Main_ContinueBoot:
1324
1325 ;
1326 ; Inform user how to switch between post-screen and menu
1327 ; by putting this info on the screen.
1328 ;
1329 xor si,si
1330 call MBR_TeletypeNL
1331 xor si,si
1332 call MBR_TeletypeNL
1333 call MBR_TeletypeSyncPos
1334 xor si,si
1335 call MBR_TeletypeNL
1336 call MBR_TeletypeNL
1337 mov si, offset ShowMenu
1338 call MBR_TeletypeBold
1339
1340
1341 ;
1342 ; Debug stop.
1343 ;
1344
1345 ;
1346 ; ####################### WAIT FOR KEY ########################
1347 ;
1348
1349 ; Wait for key so we can see debug log if ab-menu hangs.
1350 ;~ xor ax, ax
1351 ;~ int 16h
1352 ;call SOUND_Beep
1353
1354
1355 ; Copy BIOS POST to Second Page
1356 mov ax, VideoIO_Page1
1357 call VideoIO_BackUpTo
1358
1359 ;call SOUND_Beep
1360
1361
1362 ; BOOKMARK: Save Configuration
1363 ; Save configuration so phase1 boot-through is disabled
1364 ; on next boot.
1365 mov byte ptr [OS2_InstallVolume], 0
1366 call DriveIO_SaveConfiguration
1367
1368
1369
1370 ;
1371 ; See if setup needs to be entered.
1372 ;
1373 MBR_Main_ReEnterSetup:
1374 call SETUP_CheckEnterSETUP
1375
1376 ;
1377 ; Do some post processing.
1378 ;
1379 ; BOOKMARK: After Crap
1380 call AFTERCRAP_Main
1381
1382 MBR_Main_ReEnterBootMenuPre:
1383 ; SetUp PartitionPointers for BootMenu (filter non-bootable)
1384 call PART_CalculateMenuPartPointers
1385
1386 ; ...and count that one...
1387 cmp byte ptr [PartitionPointerCount], 0
1388 jne MBR_Main_SomethingBootAble
1389 mov si, offset TXT_NoBootAble
1390 call MBR_Teletype
1391 jmp MBR_HaltSystem
1392
1393 MBR_Main_SomethingBootAble:
1394 ; FixUp Values, define Timed Setup booting, etc.
1395 call PART_FixUpDefaultPartitionValues
1396
1397
1398
1399 ; -------------------------------------------------- BOOT-MENU
1400 MBR_Main_ReEnterBootMenu:
1401 call BOOTMENU_ResetMenuVars ; reset has to be done
1402 test byte ptr [CFG_AutomaticBoot], 1
1403 jz MBR_Main_NoAutomaticBooting
1404
1405
1406 ; ------------------------------------------ AUTOMATIC BOOTING
1407 ; Select automatic partition, disable automatic booting for
1408 ; next time and boot system...
1409 mov byte ptr [CFG_AutomaticBoot], 0
1410 call PASSWORD_AskSystemPwd
1411 mov al, Menu_EntryAutomatic
1412
1413 ;mov al, 2
1414
1415 mov Menu_EntrySelected, al ; zero based
1416 jmp MBR_Main_NoBootMenu
1417
1418
1419 MBR_Main_NoAutomaticBooting:
1420
1421 ;call SOUND_Beep
1422
1423 test byte ptr [CFG_BootMenuActive], 0FFh
1424 jnz MBR_Main_GotBootMenu
1425 ; ----------------------------------------------- NO BOOT-MENU
1426 ; Select default partition and boot system...
1427 call PASSWORD_AskSystemPwd
1428
1429 ;call VideoIO_DBG_WriteString2
1430
1431 mov al, Menu_EntryDefault
1432 ;mov al,0 ; zero based
1433 mov Menu_EntrySelected, al
1434 jmp MBR_Main_NoBootMenu
1435
1436 MBR_Main_GotBootMenu:
1437 ; ------------------------------------------ BOOT-MENU VISUALS
1438
1439
1440 IFDEF FX_ENABLED
1441 call FX_StartScreen
1442 ENDIF
1443
1444 ; BOOKMARK: Build Main Menu
1445 call BOOTMENU_BuildBackground
1446 call BOOTMENU_BuildMain
1447
1448 IFDEF FX_ENABLED
1449 call FX_EndScreenRight
1450 ENDIF
1451
1452 call PASSWORD_AskSystemPwd
1453 call BOOTMENU_ResetTimedBoot
1454
1455 ; BOOKMARK: Display Main Menu
1456 call BOOTMENU_Execute
1457
1458 jc MBR_Main_ReEnterSetup
1459 call BOOTMENU_SetVarsAfterMenu
1460
1461 ; ---------------------------------------------------- BOOTING
1462 MBR_Main_NoBootMenu:
1463
1464 IFDEF FX_ENABLED
1465 call FX_StartScreen
1466 ENDIF
1467
1468 ; BOOKMARK: Display bye-screen and start selected partition
1469 call BOOTMENU_BuildGoodBye
1470
1471 IFDEF FX_ENABLED
1472 call FX_EndScreenRight
1473 ENDIF
1474
1475 call PASSWORD_AskChangeBootPwd
1476
1477 call ANTIVIR_SaveBackUpMBR
1478
1479 ; Preload the selected menu-entry
1480 ; However, this value will be wrong if OS/2 phase1 is
1481 ; active and the installation partition is newly created.
1482 ; See below for the adjustment.
1483 mov dl, byte ptr [Menu_EntrySelected]
1484
1485
1486 ;
1487 ; Prepare to start the partition.
1488 ;
1489 jmp MBR_Main_StartPartition
1490
1491
1492
1493; -----------------------------------------------------------------------------
1494; START PARTITION
1495; -----------------------------------------------------------------------------
1496
1497 MBR_Main_StartPartition:
1498
1499IFDEF AUX_DEBUG
1500 IF 0
1501 pushf
1502 pusha
1503 ;~ call DEBUG_DumpIPT
1504 ;~ call DEBUG_DumpPartitionPointers
1505 ;~ call DEBUG_DumpPartitionXref
1506 ;~ call DEBUG_DumpNewPartTable
1507 popa
1508 popf
1509 ENDIF
1510ENDIF
1511
1512
1513 ; -------------------------------------------- START PARTITION
1514 ; THIS DOES NOT RETURN !
1515 call PART_StartPartition
1516
1517
1518
1519
1520;
1521; This entry-point restarts AiR-BOOT almost from scratch.
1522; It skips the movement of the MBR but otherwise it is a functional restart.
1523; The old BIOS SS:SP where the registers on entry are stored is passed along.
1524; This entry-point is used for debugging purposes.
1525;
1526; BOOKMARK: AiR-BOOT Restart (used for debugging)
1527AirbootRestart:
1528 mov bx, [OldSP] ; Old SP when BIOS transferred control to AB
1529 mov cx, [OldSS] ; Old SS when BIOS transferred control to AB
1530 xor dh, dh ; Head 0
1531 mov dl, [BIOS_BootDisk] ; Disk AirBoot was loaded from
1532 jmp MBR_RealStart
1533
1534
1535;
1536; This entry-point displays a popup that the system is halted
1537; and then halts the system.
1538; It is entered on severe error conditions.
1539;
1540; BOOKMARK: Halt System
1541HaltSystem:
1542 call VideoIO_ClearScreen
1543 mov ax,0ababh
1544 mov cx, 0C04h
1545 mov si, offset SystemHalted
1546 call SETUP_ShowErrorBox
1547 ; Halt the system.
1548 jmp MBR_HaltSystem
1549
1550
1551
1552
1553
1554
1555 ;
1556 ; The following section includes various assembler modules
1557 ; at the source level. These contain functionality for a
1558 ; multitude of categories like disk-access, video-io, lvm,
1559 ; debugging, etc. Later versions of AiR-BOOT will use such
1560 ; modules at the object-file level so they can be shared
1561 ; more easily.
1562 ;
1563
1564
1565; -----------------------------------------------------------------------------
1566; INCLUDED FILE SECTION
1567; -----------------------------------------------------------------------------
1568
1569; BOOKMARK: Include Section
1570
1571;
1572; Include other code-modules here.
1573;
1574
1575b_std_txt:
1576include regular/std_text.asm ; Standard (non-translateable text)
1577size_std_txt = $-b_std_txt
1578
1579b_driveio:
1580include regular/driveio.asm ; Drive I/O, Config Load/Save
1581size_driveio = $-b_driveio
1582
1583b_lvm:
1584include special/lvm.asm ; LVM-specific code
1585size_lvm = $-b_lvm
1586
1587b_videoio:
1588include regular/videoio.asm ; Video I/O
1589size_videoio = $-b_videoio
1590
1591b_timer:
1592include regular/timer.asm ; Timer
1593size_timer = $-b_timer
1594
1595b_partmain:
1596include regular/partmain.asm ; Regular Partition Routines
1597size_partmain = $-b_partmain
1598
1599b_partscan:
1600include regular/partscan.asm ; Partition Scanning
1601size_partscan = $-b_partscan
1602
1603b_bootmenu:
1604include regular/bootmenu.asm ; Boot-Menu
1605size_bootmenu = $-b_bootmenu
1606
1607b_password:
1608include regular/password.asm ; Password related
1609size_password = $-b_password
1610
1611b_other:
1612include regular/other.asm ; Other Routines
1613size_other = $-b_other
1614
1615b_main:
1616include setup/main.asm ; The whole AiR-BOOT SETUP
1617size_main = $-b_main
1618
1619b_math:
1620include regular/math.asm ; Math functions (like 32-bit multiply)
1621size_math = $-b_math
1622
1623b_txtother:
1624include text/txtother.asm ; All translateable Text-Strings
1625size_txtother = $-b_txtother
1626
1627b_txtmenus:
1628include text/txtmenus.asm ; All translateable Menu-text
1629size_txtmenus = $-b_txtmenus
1630
1631b_charset:
1632include text/charset.asm ; Special Video Charsets (if needed)
1633size_charset = $-b_charset
1634
1635b_conv:
1636include regular/conv.asm ; Various conversion routines
1637size_conv = $-b_conv
1638
1639b_virus:
1640include special/virus.asm ; Virus Detection / Anti-Virus
1641size_virus = $-b_virus
1642
1643b_billsuxx:
1644include special/f00k/billsuxx.asm ; Extended Partition - Microsoft-Hack
1645size_billsuxx = $-b_billsuxx
1646
1647b_sound:
1648include special/sound.asm ; Sound
1649size_sound = $-b_sound
1650
1651b_apm:
1652include special/apm.asm ; Power Managment Support
1653size_apm = $-b_apm
1654
1655
1656
1657;
1658; Cyrillic support.
1659;
1660IFDEF TXT_IncludeCyrillic
1661b_ccharset:
1662 include special/charset.asm ; Charset Support (e.g. Cyrillic)
1663size_ccharset = $-b_ccharset
1664ENDIF
1665
1666; Various debugging routines, uses AUXIO and CONV
1667IFDEF AUX_DEBUG
1668b_debug:
1669include regular/debug.asm ; Debug module
1670size_debug = $-b_debug
1671b_auxio:
1672include regular/auxio.asm ; Com-port support for debugging
1673size_auxio = $-b_auxio
1674ENDIF
1675
1676;
1677; We only include this if FX_ENABLED is defined.
1678; FX is disabled when debugging to have more room for debug-code.
1679; The module compiles to 50eh = 1294 bytes, so that is a lot.
1680;
1681IFDEF FX_ENABLED
1682b_fx:
1683include special/fx.asm ; l33t Cooper-Bars/Scrolling <bg>
1684size_fx = $-b_fx
1685ENDIF
1686
1687
1688 ;
1689 ; End of code marker.
1690 ;
1691 ; BOOKMARK: END OF CODE
1692 db 'BABE'
1693 db 'FACE'
1694
1695
1696; -----------------------------------------------------------------------------
1697; END OF CODE
1698; -----------------------------------------------------------------------------
1699code_end:
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710; -----------------------------------------------------------------------------
1711; BLDLEVEL INFORMATION
1712; -----------------------------------------------------------------------------
1713
1714 ; BOOKMARK: BLDLEVEL Information
1715 ORIGIN 068A0h
1716
1717;
1718; The space between this offset and code_end is the space
1719; available for code.
1720;
1721zzz_code_space = $ - code_end
1722
1723
1724bld_level:
1725 ;
1726 ; Here we insert the OS/2 BLDLEVEL Information.
1727 ; It is composed of the AiR-BOOT version-info and other
1728 ; information. It is unique for each release of AiR-BOOT.
1729 ;
1730
1731 ;
1732 ; ?? When AUX_DEBUG is enabled and the above org is active,
1733 ; the BLDLEVEL gets corrupted eventhough it gets inserted here
1734 ; explicitly. The effect is almost like an 'OR' or a merge
1735 ; with the already generated FX code.
1736 ; Tasm and JWasm produce different results.
1737 ; ??
1738 ;
1739 InsertBuildLevel
1740
1741
1742
1743
1744
1745;==============================================================================
1746; Sector 53
1747;==============================================================================
1748
1749 ;
1750 ; From here on, the layout of the image consists of:
1751 ; - AiR-BOOT Protection Image
1752 ; - AiR-BOOT Configuration
1753 ; - DriveLetters
1754 ; - Install Volume
1755 ; - Floppy/CDROM/BIOS BOOT ENTRIES
1756 ; - Internal Partition Table (IPT)
1757 ; - Hidden Partition Table (HPT)
1758 ; - MBR Backup
1759 ;
1760
1761 ;
1762 ; After that, the BSS follows with several runtime
1763 ; variables and structures.
1764 ; The BSS is not part of the image on disk of course.
1765 ;
1766
1767; -----------------------------------------------------------------------------
1768; PROTECTION IMAGE
1769; -----------------------------------------------------------------------------
1770
1771 ;
1772 ; This is the AiR-BOOT MBR Protection Image.
1773 ; The stuff generated here gets overwritten when the
1774 ; MBR_PROT module, which is assembled separately,
1775 ; gets binary merged.
1776 ; So you won't find the string below in the generated binary.
1777 ;
1778 ; BOOKMARK: AiR-BOOT MBR Protection Image
1779 ORIGIN 06900h
1780
1781
1782
1783
1784;
1785; Hardcoded to 768 bytes (MBR_PROT.ASM)
1786; The string below is searched for by the FIXCODE helper and *must* be
1787; page (256 bytes) aligned.
1788;
1789; It seems to be possible to shrink the protection-image to 768 bytes.
1790; That gives us an additional 256 bytes of code-space.
1791; MBR-PROT.ASM,FIXCODE.C,PARTMAIN.ASM and AIR-BOOT.ASM need to be adjusted for that.
1792; Also the granularity needs to change from 512 bytes to 256 bytes since
1793; 6900h is not a 512-byte boundary.
1794;
1795; 20120908 - Done.
1796;
1797MBR_Protection db 'AiR-BOOT MBR-Protection Image'
1798
1799 ; Just fill.
1800 ;~ db 1024-($-MBR_Protection) dup('M')
1801 db 768-($-MBR_Protection) dup('M')
1802
1803
1804
1805
1806
1807
1808
1809;==============================================================================
1810; Sector 55
1811;==============================================================================
1812; -----------------------------------------------------------------------------
1813; AiR-BOOT CONFIGURATION
1814; -----------------------------------------------------------------------------
1815
1816 ;
1817 ; This section contains the AiR-BOOT configuration.
1818 ; Note that it has a version that should be updated
1819 ; when stuff is added.
1820 ; Also add stuff to the end so that offsets of other
1821 ; variables remain vaild.
1822 ;
1823 ; BOOKMARK: AiR-BOOT Configuration Sector
1824 ORIGIN 06C00h
1825
1826Configuration:
1827 ; This is the signature for the AiR-BOOT Configuration.
1828 ; Note that this configuration section, like the code section,
1829 ; is CRC protected. This means that poking values in these
1830 ; sections on the disk will invalidate AiR-BOOT and cause it
1831 ; to halt. This is a protection method against other software
1832 ; modifying stuff in track 0.
1833 db 'AiRCFG-TABLE',0adh
1834 db 01h, 10h, 'U' ; "Compressed" ID String
1835 ; Version 1.02 was for code 1.06, 1.03 was internal
1836 ; and 1.04,1.05 and 1.06 do not exist.
1837 ;
1838 ; 1.07 was used with AB v1.07 and introduced the phase1
1839 ; system-name. For the rest it is compatible with v1.02.
1840 ;
1841 ; 1.0.8 is introduced with AB v1.0.8 and indicates the movement
1842 ; of several components and the packing of the hideparttable.
1843 ; The core configuration has not changed but the generated
1844 ; configuration has. The v1.0.8 installer handles upgrading.
1845 ;
1846 ; It has been decided that uneven minor numbers will be
1847 ; test-versions. Therefore v1.0.8 has been bumbed to v1.1.0.
1848 ;
1849 ; It is not required for the config to have the
1850 ; same version as the code, so in the future
1851 ; the code version might be higher than the
1852 ; config version if there are no changes to the latter.
1853 ;
1854
1855CFG_LastTimeEditLow dw 0 ; Last Time Edited Stamp (will incr every setup)
1856CFG_LastTimeEditHi dw 0 ; second 16 bit part...
1857
1858CFG_CheckConfig dw 0 ; Check-Sum for Configuration
1859
1860CFG_Partitions db 0 ; Count of partitions in IPT
1861CFG_MiscFlags db 1 ; Miscellaneous Flags (See EQUates)
1862CFG_PartDefault db 0 ; Default-Partition (Base=0)
1863
1864CFG_PartLast db 0 ; Which Partition was booted last time ? (Base=0)
1865CFG_TimedBoot db 0 ; Timed Boot Enable (for REAL Enable look TimedBootEnable)
1866CFG_TimedSecs db 15 ; Timed Boot - How Many Seconds Till Boot
1867CFG_TimedDelay dw 123 ; Timed Boot - Delay
1868CFG_TimedBootLast db 1 ; Timed Boot - Boot From Last Drive Booted From
1869CFG_RememberBoot db 1 ; Remember Manual Boot Choice
1870CFG_RememberTimed db 0 ; Remember if Timed Boot (if both disabled: Boot Default)
1871CFG_IncludeFloppy db 1 ; Include Floppy Drives in Boot-Menu
1872CFG_BootMenuActive db 1 ; Display Boot-Menu (if Disabled: Boot Default)
1873 ; v0.29+ -> 2 - Detailed Bootmenu
1874CFG_PartitionsDetect db 1 ; Autodetect New Partitions (Auto-Add!)
1875CFG_PasswordSetup db 0 ; Ask Password when entering Setup
1876CFG_PasswordSystem db 0 ; Ask Password when booting System
1877CFG_PasswordChangeBoot db 0 ; Ask Password when changing boot partition
1878CFG_ProtectMBR db 0 ; Protect MBR via TSR ?
1879CFG_IgnoreWriteToMBR db 0 ; Just ignore writes to MBR, otherwise crash
1880CFG_FloppyBootGetName db 0 ; Gets floppy name for display purposes
1881CFG_DetectVirus db 0 ; Detect Virus ?
1882CFG_DetectStealth db 0 ; Detect Stealth-Virus ?
1883CFG_DetectVIBR db 0 ; Detect BootRecord-Virus ?
1884CFG_AutoEnterSetup db 0 ; Automatic Enter Setup (first install!)
1885CFG_MasterPassword dw 0101Fh ; Encoded Password (this is just CR)
1886 dw 07A53h
1887 dw 0E797h
1888 dw 0A896h
1889CFG_BootPassword dw 0101Fh ; Another CR... ;-)
1890 dw 07A53h
1891 dw 0E797h
1892 dw 0A896h
1893 db 0 ; Rude-Protection - Removed since v0.28b
1894CFG_LinuxRootPartition db 0 ; Linux Root Partition (Base=0)
1895CFG_TimedKeyHandling db 0 ; Timed Key Handling (for Timed Boot)
1896 ; 0 - Do Nothing
1897 ; 1 - Reset Time
1898 ; 2 - Stop Time
1899CFG_MakeSound db 0 ; Should be clear ;)
1900CFG_FloppyBootGetTimer db 0 ; Floppy Name will get updated every 2 secs
1901CFG_ResumeBIOSbootSeq db 1 ; If BIOS Boot Sequence should be resumed
1902 ; 0 - Disabled
1903 ; 1 - CD-ROM
1904 ; 2 - Network
1905 ; 3 - ZIP/LS120
1906CFG_CooperBars db 0 ; If Cooper Bars should be shown
1907CFG_LinuxCommandLine db 75 dup (0) ; Linux Command Line
1908CFG_LinuxKrnlPartition db 0FFh ; FAT-16 Linux Kernel Partition (Base=0)
1909 ; FFh -> Disabled
1910CFG_LinuxDefaultKernel db 'DEFAULT', 4 dup (32), 0 ; Default Kernel Name
1911CFG_LinuxLastKernel db 11 dup (32), 0 ; Last-Booted Kernel Name
1912CFG_ExtPartitionMShack db 0 ; Extended Partition M$-Hack Global Enable
1913CFG_AutomaticBoot db 0 ; Automatic Booting (only one bootup)
1914CFG_PartAutomatic db 0 ; Partition-No for automatic booting
1915CFG_ForceLBAUsage db 1 ; LBA-BIOS-API forced on any HDD I/O
1916CFG_IgnoreLVM db 0 ; Ignores any LVM-Information
1917
1918
1919;
1920; THERE IS ROOM RESERVED HERE FOR MORE VARIABLES
1921;
1922
1923 ;
1924 ; Drive Letters.
1925 ;
1926 ; BOOKMARK: Stored Drive Letters
1927 ORIGIN 06CB0h
1928
1929
1930; -----------------------------------------------------------------------------
1931; DRIVE LETTERS
1932; -----------------------------------------------------------------------------
1933
1934;
1935; Moved here to make room for packed hiddenparttable.
1936; This gets filled with drive-letters that are assigned using the dl-feature.
1937;
1938DriveLetters db LocIPT_MaxPartitions dup (0)
1939 ; Format is:
1940 ;============
1941 ; Drive-Letter : BYTE (80h-C:, 81h-D:)
1942 ; --------------------> 1 Byte * 45
1943
1944
1945
1946; -----------------------------------------------------------------------------
1947; INSTALL VOLUME
1948; -----------------------------------------------------------------------------
1949
1950 ;
1951 ; Allways have the name of the installation volume
1952 ; at this offset.
1953 ; So future config changes will not break auto-install.
1954 ;
1955 ; BOOKMARK: Name of OS/2 Installation Volume
1956 ORIGIN 06D00h
1957
1958; SET(A)BOOT stores the volume name of the OS/2 system being installed here.
1959; It is truncated to 11 chars because AiR-BOOT currently does not support
1960; longer labelnames. The name is also capitalized.
1961OS2_InstallVolume db 0,'NOPHASEONE' ,0
1962
1963;
1964; THERE IS ROOM RESERVED HERE FOR MORE VARIABLES
1965;
1966
1967
1968; -----------------------------------------------------------------------------
1969; FLOPPY/CDROM/BIOS BOOT ENTRIES
1970; -----------------------------------------------------------------------------
1971
1972 ;
1973 ; 06DABh - 06C00h = 01ABh = 427 bytes.
1974 ; Entries allocated down from 06E00 boundary.
1975 ;
1976 ; BOOKMARK: Floppy/CD-ROM/BIOS Boot Entries
1977 ORIGIN 06DABh ; 427 Boundry
1978
1979; (432 - 5 = 427)
1980AutoDrvLetter db 0
1981AutoDrvLetterSerial dd 0
1982
1983; This entry is also 34 bytes long (466 - 34 = 432)
1984BIOScontIPTentry:
1985 db 0, 0, 0, 0, ' '
1986 db 0, 0FEh, Flags_Bootable
1987 dw 0 ; No Checksum :)
1988 db 0, 1, 0
1989 db 0, 1, 0 ; Location of Partition/Boot Record
1990 dd 0, 0
1991
1992; VIR variables are for the AiR-BOOT Anti Virus Code
1993; Most of them are backups of Interrupt Points, so we can check, if a
1994; stealth virus is on-line, we can intercept its call.
1995; Normal (non stealth) virus are trapped simply by rereading the MBR sector.
1996; If a virus is found, we will restore MBR from Sektor 60/62 and stop the
1997; system from working, so the user has to press reset.
1998; That's saver than a Reboot.
1999;
2000; If a virus is found on the partition to boot, the system will ONLY halt,
2001; nothing more, because we can not remove it. The user shall do it :)
2002; Those viruses are detected via a real nasty method...Checksum-Checking of the
2003; boot-record, which is to be executed. If it does not match the one in our
2004; internal partition table, we will stop. You may however switch this detection
2005; off or just reset it by switching 'VIBR Detection'.
2006
2007; 478 - 12 = 466 ; 466 Sub-Part
2008CFG_VIR_INT08 dd 0 ; pointer to saved 08h entry point
2009CFG_VIR_INT13 dd 0 ; pointer to saved 13h entry point
2010CFG_VIR_INT1C dd 0 ; pointer to saved 1Ch entry point
2011
2012; 478 Boundry (512-34)
2013; This entry is also 34 bytes long
2014FloppyIPTentry db 0, 0, 0, 0, 'FloppyDrive'
2015 db 0, 0FFh, Flags_Bootable
2016 dw 0 ; No Checksum :)
2017 db 0, 1, 0
2018 db 0, 1, 0 ; Location of Partition/Boot Record
2019 dd 0, 0
2020
2021
2022
2023; -----------------------------------------------------------------------------
2024; INTERNAL PARTITION TABLE (IPT)
2025; -----------------------------------------------------------------------------
2026
2027 ;
2028 ; AiR-BOOT Internal Partition Table (IPT)
2029 ;
2030 ; BOOKMARK: Internal Partition Table
2031 ORIGIN % (image_size - 0a00h - (image_size - image_size_60secs))
2032
2033
2034;
2035; Rousseau: This is the start of the AiR-BOOT IPT
2036;
2037PartitionTable db (LocIPT_MaxPartitions * LocIPT_LenOfIPT) dup (0)
2038; no-partitions detected... :]
2039; db 1, 0, 0, 0, 'Harddisc 1'
2040; db 0, 0FFh, Flags_BootAble
2041; dw 0 ; No Checksum :)
2042; db 0, 0, 1
2043; db 0, 0, 1 ; Location of Partition/Boot Record
2044; dd 0, 0
2045
2046 ; Format is:
2047 ;============
2048 ; SerialNumber * 4
2049 ; PartitionName * 11
2050 ; Drive * 1
2051 ; SystemID * 1 (means the partition type)
2052 ; Flags * 1
2053 ; Checksum * 2 (for virus checking)
2054 ; LocationBegin * 3 (where the partition begins)
2055 ; LocationPartTab * 3 (where the partition table is)
2056 ; AbsoluteBegin * 4 (where the partition begins, in absolute sectors)
2057 ; AbsolutePartTab * 4 (where the partition table is, in absolute sectors)
2058 ; --------------------> 34 Bytes (total maximum partition-entries = 30)
2059
2060
2061
2062 ; No need to check overlap here because this string will
2063 ; be overwritten if the maximum partition count is reached.
2064 ; So this is not a critical boundary.
2065 ORG (image_size - 600h - (image_size - image_size_60secs) / 2 - 10)
2066
2067 db 'AiRBOOTPAR' ; 1K internal partition table
2068
2069
2070
2071; -----------------------------------------------------------------------------
2072; HIDDEN PARTITION TABLE (HPT)
2073; -----------------------------------------------------------------------------
2074
2075 ;
2076 ; Hidden Partition Table (6-bit packed as of v1.0.8)
2077 ;
2078 ; BOOKMARK: Hidden Partition Table (packed)
2079 ORIGIN % (image_size - 600h - (image_size - image_size_60secs) / 2)
2080
2081HidePartitionTable db (LocIPT_MaxPartitions * LocHPT_LenOfHPT) dup (0FFh)
2082 ; Format is:
2083 ;============
2084 ; PartitionPtr : BYTE * 30
2085 ; --------------------> 30 Bytes * 45
2086
2087;
2088; Driveletters were here.
2089; Moved down to make room for packed hideparttable.
2090;
2091
2092
2093 ;
2094 ; End of hidden partition table.
2095 ; Check overlap here for security reasons.
2096 ;
2097 ORIGIN % (image_size - 200h - 5)
2098
2099; 79fa - end of packed hide table
2100 db 'ABHID' ; 1K internal Hide-partition table
2101
2102
2103
2104
2105;==============================================================================
2106; Sector 62
2107;==============================================================================
2108; -----------------------------------------------------------------------------
2109; MBR BACKUP
2110; -----------------------------------------------------------------------------
2111
2112 ;
2113 ; AiR-BOOT MBR Backup.
2114 ;
2115 ; BOOKMARK: MBR Backup
2116 ORIGIN % (image_size - 200h)
2117
2118
2119MBR_BackUpMBR db 'AiR-BOOT MBR-BackUp',\
2120 ' - Just to fill this sector with something',0
2121AirBootRocks db 'AiR-BOOT Rocks!',0
2122
2123 db (512 - ($-MBR_BackUpMBR) - 2) dup('M')
2124
2125 ; End of Image signature.
2126 ;
2127 ORIGIN % (image_size - 2)
2128 dw 0BABEh
2129
2130
2131 ;
2132 ; End of Image.
2133 ;
2134 ORIGIN % (image_size)
2135image_end:
2136
2137;
2138; Terminate LDRIMAGE segment.
2139;
2140IFDEF SEGMENTED
2141LDRIMAGE ENDS
2142ENDIF
2143
2144
2145
2146
2147
2148
2149
2150;##############################################################################
2151; BSS SEGMENT
2152;##############################################################################
2153
2154; BOOKMARK: BSS Segment
2155
2156;
2157; Open BSS segment.
2158;
2159IFDEF SEGMENTED
2160VOLATILE SEGMENT USE16 PUBLIC 'BSS'
2161ENDIF
2162
2163
2164
2165sobss:
2166sobss_abs = offset sobss + image_size
2167;------------------------------------------------------------------------------
2168
2169
2170 ;
2171 ; This is the actual start of the BSS.
2172 ; In the past however, we have had a code-loop that went out of bounds,
2173 ; overwriting the start of the BSS.
2174 ;
2175 ; Because important runtime data is stored in the BSS, we offset it
2176 ; by 400h bytes. Since the loader-image is always 62 sectors, which
2177 ; makes it 7c00h in size, the runtime data starts at 8000h.
2178 ; This is the 'BeginOfVariables' location.
2179 ;
2180
2181
2182;
2183; If segmented, offsets are relative to the BSS segment.
2184; They are resolved at link-time.
2185; If not segmented, offsets are relative to the CODE segment.
2186;
2187IFDEF SEGMENTED
2188 ORG 00400h ; 7c00h + 400h = 8000h
2189ELSE
2190 ORG 08000h ; 8000h
2191ENDIF
2192
2193
2194; -----------------------------------------------------------------------------
2195; START OF BSS DATA
2196; -----------------------------------------------------------------------------
2197; This space actually gets initialized in PreCrap to NUL (till EndOfVariables)
2198BeginOfVariables:
2199BeginOfVariablesAbs = offset BeginOfVariables + image_size
2200
2201
2202; -----------------------------------------------------------------------------
2203; SECTOR BUFFERS
2204; -----------------------------------------------------------------------------
2205; BOOKMARK: Sector Buffers
2206PartitionSector db 512 dup (?) ; Temporary Sector for Partition
2207PBRSector db 512 dup (?) ; Temporary Sector for JFS/HPFS writeback
2208LVMSector db 512 dup (?) ; Temporary Sector for LVM
2209TmpSector db 512 dup (?) ; Temporary Sector
2210Scratch db 512 dup (?) ; Scratch buffer
2211 ALIGN 16
2212
2213
2214; -----------------------------------------------------------------------------
2215; NEW PARTITION TABLE
2216; -----------------------------------------------------------------------------
2217; Everything used to build a new IPT and reference it to the old one
2218; BOOKMARK: New Partition Table
2219NewPartTable db 1536 dup (?) ; New Partition Table
2220 ALIGN 16
2221
2222
2223; -----------------------------------------------------------------------------
2224; NEW HIDE PARTITION TABLE
2225; -----------------------------------------------------------------------------
2226; BOOKMARK: New Hide-Partition Table
2227NewHidePartTable db LocIPT_MaxPartitions * LocHPT_LenOfHPT dup (?)
2228 ALIGN 16
2229
2230
2231; -----------------------------------------------------------------------------
2232; NEW DRIVE LETTERS
2233; -----------------------------------------------------------------------------
2234; BOOKMARK: Logical Drive-Letters
2235NewDriveLetters db LocIPT_MaxPartitions dup (?)
2236 ALIGN 16
2237
2238
2239; -----------------------------------------------------------------------------
2240; PARTITION SIZE TABLE
2241; -----------------------------------------------------------------------------
2242; Size-Table (6 bytes per partition)
2243; BOOKMARK: Partition Size Table
2244PartitionSizeTable db LocIPT_MaxPartitions * 6 dup (?)
2245 ALIGN 16
2246
2247
2248; -----------------------------------------------------------------------------
2249; PARTITION POINTERS
2250; -----------------------------------------------------------------------------
2251; Maximum is 52 word entries till now
2252; BOOKMARK: Partition Pointers
2253PartitionPointers dw 52 dup (?)
2254 ALIGN 16
2255
2256; Count of total Partition Pointers
2257PartitionPointerCount db ?
2258 ALIGN 16
2259
2260
2261; -----------------------------------------------------------------------------
2262; XREF TABLE
2263; -----------------------------------------------------------------------------
2264; X-Reference Table (holds new partnr, index is old part nr)
2265; BOOKMARK: Xref Table
2266PartitionXref db LocIPT_MaxPartitions dup (?)
2267 ALIGN 16
2268
2269
2270; -----------------------------------------------------------------------------
2271; VOLUME LETTERS
2272; -----------------------------------------------------------------------------
2273; Volume-Letters
2274; 0 - no LVM support
2275; 1 - LVM support, but no letter
2276; 'C'-'Z' - assigned drive letter
2277; BOOKMARK: Volume Drive Letters
2278PartitionVolumeLetters db LocIPT_MaxPartitions dup (?)
2279 ALIGN 16
2280
2281
2282; -----------------------------------------------------------------------------
2283; MISC VARS AND FLAGS
2284; -----------------------------------------------------------------------------
2285; BOOKMARK: Misc Vars and Flags
2286TotalHarddiscs db ? ; Total harddrives (by POST)
2287LBASwitchTable db 128 dup (?) ; Bit 25-18 for CHS/LBA Switching
2288NewPartitions db ? ; Freshly found partitions
2289 ; Independent of SaveConfiguration
2290TooManyPartitions db ? ; Non-zero if too many partitions found
2291
2292VideoIO_Segment dw ? ; Segment for Video I/O
2293
2294ExtendedAbsPos dd ? ; Extended Partition Absolute Position
2295ExtendedAbsPosSet db ? ; If Absolute Position set
2296
2297CurPartition_Location dw 4 dup (?) ; Where did current partition come from?
2298CurIO_UseExtension db ? ; 1-Use INT 13h EXTENSIONS
2299 ; (filled out by PreCrap)
2300CurIO_Scanning db ? ; 1-AiR-BOOT is scanning partitions
2301 ; (for detailed error message)
2302 ALIGN 16
2303
2304
2305; -----------------------------------------------------------------------------
2306; MENU RELATED VARS
2307; -----------------------------------------------------------------------------
2308Menu_EntrySelected db ? ; Which partition we boot this time...
2309Menu_UpperPart db ? ; Which number (Base=0) is the partition upper pos
2310Menu_AbsoluteX db ? ; Pos where Menu stuff starts
2311Menu_TotalParts db ? ; Copy of CFG_BootParts
2312Menu_TotalLines db ? ; Total Lines on Screen used for BootMenu
2313Menu_EntryDefault db ? ; Default Entry in filtered View
2314Menu_EntryLast db ? ; LastBooted Entry in filtered View
2315Menu_EntryAutomatic db ? ; Automatic Entry in filtered View
2316 ; - All adjusted to menu locations
2317 ALIGN 16
2318
2319
2320; -----------------------------------------------------------------------------
2321; PARTITION RELATED VARS
2322; -----------------------------------------------------------------------------
2323PartSetup_UpperPart db ? ; Partition-Setup (like Menu_UpperPart)
2324PartSetup_ActivePart db ? ; Active Partition
2325PartSetup_HiddenUpper db ? ; (like Menu_UpperPart)
2326PartSetup_HiddenX db ? ; Pos for Hidden-Setup
2327PartSetup_HiddenAdd db ? ; Adjust for Hidden-Setup
2328 ALIGN 16
2329
2330
2331; -----------------------------------------------------------------------------
2332; TIMER / SETUP RELATED VARS
2333; -----------------------------------------------------------------------------
2334TimedBootEnable db ? ; Local Enable/Disable for timed boot
2335TimedTimeOut dd ? ; TimeOut Timer for TimedBoot (too much time here;)
2336TimedSecondLeft db ? ; How many seconds are left till boom ?
2337TimedSecondBack db ? ; To get a modification noticed
2338TimedBootUsed db ? ; Timed Boot used for bootup ?
2339FloppyGetNameTimer dd ? ; Timer for Floppy-Get-Name
2340SETUP_KeysOnEntry db ? ; which Shift Status was there, when booting ?
2341SETUP_ExitEvent db ? ; Exit Event to end SETUP
2342TempPasswordEntry db 17 dup (?)
2343SETUP_OldPwd db 17 dup (?)
2344SETUP_NewPwd db 17 dup (?)
2345SETUP_VerifyPwd db 17 dup (?)
2346StartSoundPlayed db ?
2347ChangePartNameSave db ? ; Save label after user-edit ?
2348SyncLvmLabels db ? ; Sync LVM labels after user-edit ?
2349 ALIGN 16
2350
2351
2352; -----------------------------------------------------------------------------
2353; FX RELATED VARS
2354; -----------------------------------------------------------------------------
2355FX_UseCount dw ?
2356FX_OverallTimer dw ?
2357FX_WideScrollerTimer dw ?
2358FX_WideScrollerCurPos dw ?
2359FX_WideScrollerSpeed db ?
2360FX_WideScrollerSpeedState db ?
2361FX_WideScrollerDirection db ?
2362FX_WideScrollerAbsDirection db ?
2363FX_WideScrollerBounceSpeed db ?
2364FX_CooperBarsTimer dw ?
2365 ALIGN 16
2366
2367; Dynamically Generated Tables - do not need to get initialized with NUL
2368FX_CooperColors db 672 dup (?) ; 7 cooper bars*96 - runtime calculated
2369FX_CooperState db 7 dup (?)
2370FX_SinusPos db 7 dup (?)
2371FX_CooperPos dw 7 dup (?)
2372 ALIGN 16
2373
2374
2375; -----------------------------------------------------------------------------
2376; CHARSET BUFFER
2377; -----------------------------------------------------------------------------
2378CharsetTempBuffer db 4096 dup (?) ; Uninitialized Charset buffer
2379 ALIGN 16
2380
2381
2382; -----------------------------------------------------------------------------
2383; LVM CRC TABLE
2384; -----------------------------------------------------------------------------
2385LVM_CRCTable dd 256 dup (?) ; LVM-CRC (->SPECiAL\LVM.asm)
2386 ALIGN 16
2387
2388
2389; -----------------------------------------------------------------------------
2390; LVM DRIVE-LETTER MAP
2391; -----------------------------------------------------------------------------
2392; Get's initialized at startup to: 00000011111111111111111111111100b
2393; Meaning A,B not free; C-Z free, rest unused. (right to left)
2394; Each partition with an assigned drive-letter clears a bit in this map.
2395FreeDriveletterMap dd ?
2396 ALIGN 16
2397
2398
2399; -----------------------------------------------------------------------------
2400; OS/2 PHASE1 RELATED
2401; -----------------------------------------------------------------------------
2402Phase1Active db ?
2403OldPartitionCount db ?
2404 ALIGN 16
2405
2406
2407; -----------------------------------------------------------------------------
2408; ARRAY OF DISK INFORMATION STRUCTURES
2409; -----------------------------------------------------------------------------
2410; Array of DISKINFO structures
2411DiskInformation db MaxDisks dup(DISKINFO_Size dup(?))
2412 ALIGN 16
2413
2414
2415; -----------------------------------------------------------------------------
2416; INT13X DAP
2417; -----------------------------------------------------------------------------
2418; Disk Address Package that holds information for LBA-access using INT13X
2419INT13X_DAP db ? ; Size of paket, inserted by code
2420 db ? ; Reserved
2421INT13X_DAP_NumBlocks dw ? ; Number of blocks
2422INT13X_DAP_Transfer dd ? ; Transfer Adress
2423INT13X_DAP_Absolute dd ? ; Absolute Sector
2424 dd ? ; Second Part of QWORD
2425INT13X_DAP_Size = $-offset [INT13X_DAP] ; Calculated size
2426 ALIGN 16
2427
2428
2429; -----------------------------------------------------------------------------
2430; DEBUG
2431; -----------------------------------------------------------------------------
2432; Some debug area.
2433dbg_scratch db 512 dup(?)
2434 ALIGN 16
2435
2436
2437; End of transient variables.
2438EndOfVariables:
2439EndOfVariablesAbs = offset EndOfVariables + image_size
2440
2441
2442
2443; -----------------------------------------------------------------------------
2444; OLD AND NEW STACKS
2445; -----------------------------------------------------------------------------
2446; BOOKMARK: Storage for Old and New Stack Pointers
2447;
2448; These need to be outside the variable section because AiR-BOOT can restart
2449; itself in debug-mode. If the OldSP and OldSS would be in the variable area,
2450; they would be cleared on AiR-BOOT restart.
2451;
2452
2453; The variable section is cleared word-wise, so it could clear one byte extra
2454; depending on the alignment and size. This DD prevents the OldSP and OldSS
2455; to be partly overwritten by the clearing routine.
2456 dd ?
2457 ALIGN 16
2458
2459; SS:SP from before our relocation.
2460; The registers values when the BIOS transferred control to us were pushed
2461; on this stack.
2462
2463OldSP dw ?
2464OldSS dw ?
2465
2466; SS:SP currently in use.
2467; They are temporarily dumped here so we can pop the resgisters from
2468; the old stack to display them in debug mode.
2469CurrentSP dw ?
2470CurrentSS dw ?
2471 ALIGN 16
2472
2473; Usually, commits are buildable and some minor checking has been done that
2474; whole disks do not get wiped. However, there are situations where stuff is
2475; in such a flux that it would be better to do non-buildable commits.
2476; That makes it possible to record the changes piecemeal without the danger of
2477; accidently using the resulting loader. Of course everyone is clever enough
2478; to _never_ build commits marked as 'testing' and install the result in
2479; environments where wiping all attached disks and sticks would be a problem...
2480force_build_error dd 0f000h dup(?)
2481
2482;
2483; End of BSS segment.
2484;
2485eobss:
2486eobss_abs = offset eobss + image_size
2487;
2488; Total RAM occupied, including BSS.
2489; BASE is 8000:0000, LIMIT is 8000:FFFF.
2490; Note that the LDRIMAGE is of constant size, 7C00h = 62 sectors of 512 bytes.
2491;
2492resident_size = offset eobss + image_size
2493
2494;
2495; Close BSS segment.
2496;
2497IFDEF SEGMENTED
2498 VOLATILE ENDS
2499ELSE
2500 LDRIMAGE ENDS
2501ENDIF
2502
2503 ; BOOKMARK: End of Module
2504 END AiR_BOOT
2505
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