source: trunk/bootcode/airboot.asm@ 162

Last change on this file since 162 was 162, checked in by Ben Rietbroek, 8 years ago

Removed some ancient debugging stuff [v1.1.1-testing]

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