source: trunk/bootcode/airboot.asm@ 144

Last change on this file since 144 was 144, checked in by Ben Rietbroek, 8 years ago

Scan the disks for info prior to partition scanning [v1.1.1-testing]

This populates the DISKINFO structures for each disk found, which means
that size, BIOS geometry, LVM info etc. is now available.

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: 96.4 KB
Line 
1;
2; AiR-BOOT (c) Copyright 1998-2008 M. Kiewitz
3;
4; This file is part of AiR-BOOT
5;
6; AiR-BOOT is free software: you can redistribute it and/or modify it under
7; the terms of the GNU General Public License as published by the Free
8; Software Foundation, either version 3 of the License, or (at your option)
9; any later version.
10;
11; AiR-BOOT is distributed in the hope that it will be useful, but WITHOUT ANY
12; WARRANTY: without even the implied warranty of MERCHANTABILITY or FITNESS
13; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
14; details.
15;
16; You should have received a copy of the GNU General Public License along with
17; AiR-BOOT. If not, see <http://www.gnu.org/licenses/>.
18;
19
20
21
22
23
24
25
26;##############################################################################
27; AiR-BOOT / DEFINITIONS
28;##############################################################################
29
30;
31; Include AiR-BOOT Version Information.
32; This version-info is defined using simpel EQU's so it can serve as a
33; single source for other formats. The AiR-BOOT signature and the
34; OS/2 BLDLEVEL use this basic version information.
35;
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; -----------------------------------------------------------------------------
1142; SCAN DISKS
1143; -----------------------------------------------------------------------------
1144
1145 ;
1146 ; Scan disks for information like size etc.
1147 ;
1148 call DriveIO_ScanDisks
1149
1150
1151
1152; -----------------------------------------------------------------------------
1153; SCAN FOR PARTITIONS
1154; -----------------------------------------------------------------------------
1155
1156 ;
1157 ; Scan disks for partitions
1158 ;
1159 call PARTSCAN_ScanForPartitions
1160
1161 ;
1162 ; Internal Partition Table is now populated.
1163 ;
1164
1165
1166;!
1167;! DEBUG_BLOCK
1168;! Dump various tables.
1169;! Uncomment below to activate.
1170;!
1171IFDEF AUX_DEBUG
1172 IF 0
1173 pushf
1174 pusha
1175 ;~ call DEBUG_DumpIPT
1176 ;~ call DEBUG_DumpPartitionPointers
1177 ;~ call DEBUG_DumpNewPartTable
1178 ;~ call DEBUG_DumpDriveLetters
1179 ;~ call DEBUG_DumpDriveLetters
1180 ;~ call DEBUG_DumpVolumeLetters
1181 ;~ call DEBUG_DumpPartitionXref
1182 popa
1183 popf
1184 ENDIF
1185ENDIF
1186
1187
1188; -----------------------------------------------------------------------------
1189; RESTORE FORCED DRIVELETTER CORRELATION [LVM]
1190; -----------------------------------------------------------------------------
1191
1192 ;
1193 ; Reconnect forced drive-letters to their corresponding
1194 ; partitions.
1195 ;
1196 ; BOOKMARK: Update Driveletters so they are in-sync again
1197 call PARTSCAN_UpdateDriveLetters
1198 ; Driveletter <-> Partition correlation is now restored.
1199
1200
1201
1202;!
1203;! DEBUG_BLOCK
1204;! Dump various tables.
1205;!
1206IFDEF AUX_DEBUG
1207 IF 0
1208 pushf
1209 pusha
1210 ;~ call DEBUG_DumpIPT
1211 ;~ call DEBUG_DumpPartitionPointers
1212 ;~ call DEBUG_DumpNewPartTable
1213 ;~ call DEBUG_DumpDriveLetters
1214 ;~ call DEBUG_DumpDriveLetters
1215 ;~ call DEBUG_DumpVolumeLetters
1216 ;~ call DEBUG_DumpPartitionXref
1217 popa
1218 popf
1219 ENDIF
1220ENDIF
1221
1222
1223; -----------------------------------------------------------------------------
1224; SHOW WE ARE ALIVE
1225; -----------------------------------------------------------------------------
1226
1227 ;
1228 ; Put some info about AiR-BOOT and the system on the screen.
1229 ;
1230
1231 ; Display number of physical disks found
1232 mov si, offset DisksFound
1233 call MBR_Teletype
1234 mov al, [TotalHarddiscs]
1235 call VideoIO_SyncPos
1236 call VideoIO_PrintByteDynamicNumber
1237 xor si,si
1238 call MBR_TeletypeNL
1239
1240 ; Display number of partitions found
1241 mov si, offset PartitionsFound
1242 call MBR_Teletype
1243 mov al, [CFG_Partitions]
1244 call VideoIO_SyncPos
1245 call VideoIO_PrintByteDynamicNumber
1246
1247 ; Dump summier disk-info for disks found
1248 xor si,si
1249 call MBR_TeletypeNL
1250 call MBR_TeletypeNL
1251 call VideoIO_SyncPos
1252 mov dl,80h
1253 call VideoIO_DumpDiskInfo
1254
1255
1256
1257
1258
1259; -----------------------------------------------------------------------------
1260; eComStation PHASE1 CHECK
1261; -----------------------------------------------------------------------------
1262
1263 ;
1264 ; BOOKMARK: Check for OS/2 being installed
1265 ; Here we check if OS/2 is being installed.
1266 ; If so, we forgo the menu and directly boot it.
1267 ;
1268
1269 ; If the first byte of the name of the Install Volume is not 0
1270 ; then we potentially have a phase1 boot.
1271 test byte ptr [OS2_InstallVolume],0ffh
1272 ; Nope, so continue normally.
1273 jz MBR_Main_ContinueBoot
1274
1275 ; Setup phase1.
1276 ; It is still possible that a name was set for the
1277 ; Install Volume that does not exist.
1278 ; In that case CY will be clear and AL=0FFh.
1279 call PART_SetupPhase1
1280 ; Oops, Install Volume not found, continue normally.
1281 jnc MBR_Main_ContinueBoot
1282
1283
1284 ;
1285 ; == Install Volume Found ==
1286 ;
1287
1288
1289;!
1290;! DEBUG_BLOCK
1291;! Dump various tables.
1292;!
1293IFDEF AUX_DEBUG
1294 IF 0
1295 pushf
1296 pusha
1297 ;~ call DEBUG_DumpIPT
1298 ;~ call DEBUG_DumpPartitionPointers
1299 ;~ call DEBUG_DumpPartitionXref
1300 ;~ call DEBUG_DumpNewPartTable
1301 ;~ call DEBUG_DumpDriveLetters
1302 popa
1303 popf
1304 ENDIF
1305ENDIF
1306
1307
1308 ; BOOKMARK: Scan for Partitions (Only if OS/2 install going on)
1309 ; Because one or more partitions are possibly added, the
1310 ; PartitionXref table is not 'in sync' and could cause the
1311 ; wrong system to be automatically booted.
1312 ; So we rescan all partitions causing the PartitionXref
1313 ; table to be filled with correct values so the auto-boot
1314 ; from the new partition will work correctly.
1315 call PARTSCAN_ScanForPartitions
1316
1317
1318;!
1319;! DEBUG_BLOCK
1320;! Dump various tables.
1321;!
1322IFDEF AUX_DEBUG
1323 IF 0
1324 pushf
1325 pusha
1326 ;~ call DEBUG_DumpIPT
1327 ;~ call DEBUG_DumpPartitionPointers
1328 ;~ call DEBUG_DumpPartitionXref
1329 ;~ call DEBUG_DumpNewPartTable
1330 ;~ call DEBUG_DumpDriveLetters
1331 popa
1332 popf
1333 ENDIF
1334ENDIF
1335
1336 ; Setup automatic boot to forgo the Menu.
1337 ; PART_SetupPhase1 has filled in the other variables.
1338 mov byte ptr [CFG_AutomaticBoot],1
1339
1340 ;
1341 ; At this point the AiR-BOOT configuration has been altered
1342 ; to automatically boot the newly installed system without
1343 ; displaying the menu.
1344 ; Code further down the road will take care of that.
1345 ;
1346 jmp MBR_Main_ContinueBoot
1347
1348
1349
1350
1351 ;
1352 ; Wether a new system is being installed or not,
1353 ; booting continues here.
1354 ;
1355 MBR_Main_ContinueBoot:
1356
1357 ;
1358 ; Inform user how to switch between post-screen and menu
1359 ; by putting this info on the screen.
1360 ;
1361 xor si,si
1362 call MBR_TeletypeNL
1363 xor si,si
1364 call MBR_TeletypeNL
1365 call MBR_TeletypeSyncPos
1366 xor si,si
1367 call MBR_TeletypeNL
1368 call MBR_TeletypeNL
1369 mov si, offset ShowMenu
1370 call MBR_TeletypeBold
1371
1372
1373 ;
1374 ; Debug stop.
1375 ;
1376
1377 ;
1378 ; ####################### WAIT FOR KEY ########################
1379 ;
1380
1381 ; Wait for key so we can see debug log if ab-menu hangs.
1382 ;~ xor ax, ax
1383 ;~ int 16h
1384 ;call SOUND_Beep
1385
1386
1387 ; Copy BIOS POST to Second Page
1388 mov ax, VideoIO_Page1
1389 call VideoIO_BackUpTo
1390
1391 ;call SOUND_Beep
1392
1393
1394 ; BOOKMARK: Save Configuration
1395 ; Save configuration so phase1 boot-through is disabled
1396 ; on next boot.
1397 mov byte ptr [OS2_InstallVolume], 0
1398 call DriveIO_SaveConfiguration
1399
1400
1401
1402 ;
1403 ; See if setup needs to be entered.
1404 ;
1405 MBR_Main_ReEnterSetup:
1406 call SETUP_CheckEnterSETUP
1407
1408 ;
1409 ; Do some post processing.
1410 ;
1411 ; BOOKMARK: After Crap
1412 call AFTERCRAP_Main
1413
1414 MBR_Main_ReEnterBootMenuPre:
1415 ; SetUp PartitionPointers for BootMenu (filter non-bootable)
1416 call PART_CalculateMenuPartPointers
1417
1418 ; ...and count that one...
1419 cmp byte ptr [PartitionPointerCount], 0
1420 jne MBR_Main_SomethingBootAble
1421 mov si, offset TXT_NoBootAble
1422 call MBR_Teletype
1423 jmp MBR_HaltSystem
1424
1425 MBR_Main_SomethingBootAble:
1426 ; FixUp Values, define Timed Setup booting, etc.
1427 call PART_FixUpDefaultPartitionValues
1428
1429
1430
1431 ; -------------------------------------------------- BOOT-MENU
1432 MBR_Main_ReEnterBootMenu:
1433 call BOOTMENU_ResetMenuVars ; reset has to be done
1434 test byte ptr [CFG_AutomaticBoot], 1
1435 jz MBR_Main_NoAutomaticBooting
1436
1437
1438 ; ------------------------------------------ AUTOMATIC BOOTING
1439 ; Select automatic partition, disable automatic booting for
1440 ; next time and boot system...
1441 mov byte ptr [CFG_AutomaticBoot], 0
1442 call PASSWORD_AskSystemPwd
1443 mov al, Menu_EntryAutomatic
1444
1445 ;mov al, 2
1446
1447 mov Menu_EntrySelected, al ; zero based
1448 jmp MBR_Main_NoBootMenu
1449
1450
1451 MBR_Main_NoAutomaticBooting:
1452
1453 ;call SOUND_Beep
1454
1455 test byte ptr [CFG_BootMenuActive], 0FFh
1456 jnz MBR_Main_GotBootMenu
1457 ; ----------------------------------------------- NO BOOT-MENU
1458 ; Select default partition and boot system...
1459 call PASSWORD_AskSystemPwd
1460
1461 ;call VideoIO_DBG_WriteString2
1462
1463 mov al, Menu_EntryDefault
1464 ;mov al,0 ; zero based
1465 mov Menu_EntrySelected, al
1466 jmp MBR_Main_NoBootMenu
1467
1468 MBR_Main_GotBootMenu:
1469 ; ------------------------------------------ BOOT-MENU VISUALS
1470
1471
1472 IFDEF FX_ENABLED
1473 call FX_StartScreen
1474 ENDIF
1475
1476 ; BOOKMARK: Build Main Menu
1477 call BOOTMENU_BuildBackground
1478 call BOOTMENU_BuildMain
1479
1480 IFDEF FX_ENABLED
1481 call FX_EndScreenRight
1482 ENDIF
1483
1484 call PASSWORD_AskSystemPwd
1485 call BOOTMENU_ResetTimedBoot
1486
1487 ; BOOKMARK: Display Main Menu
1488 call BOOTMENU_Execute
1489
1490 jc MBR_Main_ReEnterSetup
1491 call BOOTMENU_SetVarsAfterMenu
1492
1493 ; ---------------------------------------------------- BOOTING
1494 MBR_Main_NoBootMenu:
1495
1496 IFDEF FX_ENABLED
1497 call FX_StartScreen
1498 ENDIF
1499
1500 ; BOOKMARK: Display bye-screen and start selected partition
1501 call BOOTMENU_BuildGoodBye
1502
1503 IFDEF FX_ENABLED
1504 call FX_EndScreenRight
1505 ENDIF
1506
1507 call PASSWORD_AskChangeBootPwd
1508
1509 call ANTIVIR_SaveBackUpMBR
1510
1511 ; Preload the selected menu-entry
1512 ; However, this value will be wrong if OS/2 phase1 is
1513 ; active and the installation partition is newly created.
1514 ; See below for the adjustment.
1515 mov dl, byte ptr [Menu_EntrySelected]
1516
1517
1518 ;
1519 ; Prepare to start the partition.
1520 ;
1521 jmp MBR_Main_StartPartition
1522
1523
1524
1525; -----------------------------------------------------------------------------
1526; START PARTITION
1527; -----------------------------------------------------------------------------
1528
1529 MBR_Main_StartPartition:
1530
1531IFDEF AUX_DEBUG
1532 IF 0
1533 pushf
1534 pusha
1535 ;~ call DEBUG_DumpIPT
1536 ;~ call DEBUG_DumpPartitionPointers
1537 ;~ call DEBUG_DumpPartitionXref
1538 ;~ call DEBUG_DumpNewPartTable
1539 popa
1540 popf
1541 ENDIF
1542ENDIF
1543
1544
1545 ; -------------------------------------------- START PARTITION
1546 ; THIS DOES NOT RETURN !
1547 call PART_StartPartition
1548
1549
1550
1551
1552;
1553; This entry-point restarts AiR-BOOT almost from scratch.
1554; It skips the movement of the MBR but otherwise it is a functional restart.
1555; The old BIOS SS:SP where the registers on entry are stored is passed along.
1556; This entry-point is used for debugging purposes.
1557;
1558; BOOKMARK: AiR-BOOT Restart (used for debugging)
1559AirbootRestart:
1560 mov bx, [OldSP] ; Old SP when BIOS transferred control to AB
1561 mov cx, [OldSS] ; Old SS when BIOS transferred control to AB
1562 xor dh, dh ; Head 0
1563 mov dl, [BIOS_BootDisk] ; Disk AirBoot was loaded from
1564 jmp MBR_RealStart
1565
1566
1567;
1568; This entry-point displays a popup that the system is halted
1569; and then halts the system.
1570; It is entered on severe error conditions.
1571;
1572; BOOKMARK: Halt System
1573HaltSystem:
1574 call VideoIO_ClearScreen
1575 mov ax,0ababh
1576 mov cx, 0C04h
1577 mov si, offset SystemHalted
1578 call SETUP_ShowErrorBox
1579 ; Halt the system.
1580 jmp MBR_HaltSystem
1581
1582
1583
1584
1585
1586
1587 ;
1588 ; The following section includes various assembler modules
1589 ; at the source level. These contain functionality for a
1590 ; multitude of categories like disk-access, video-io, lvm,
1591 ; debugging, etc. Later versions of AiR-BOOT will use such
1592 ; modules at the object-file level so they can be shared
1593 ; more easily.
1594 ;
1595
1596
1597; -----------------------------------------------------------------------------
1598; INCLUDED FILE SECTION
1599; -----------------------------------------------------------------------------
1600
1601; BOOKMARK: Include Section
1602
1603;
1604; Include other code-modules here.
1605;
1606
1607b_std_txt:
1608include regular/std_text.asm ; Standard (non-translateable text)
1609size_std_txt = $-b_std_txt
1610
1611b_driveio:
1612include regular/driveio.asm ; Drive I/O, Config Load/Save
1613size_driveio = $-b_driveio
1614
1615b_lvm:
1616include special/lvm.asm ; LVM-specific code
1617size_lvm = $-b_lvm
1618
1619b_videoio:
1620include regular/videoio.asm ; Video I/O
1621size_videoio = $-b_videoio
1622
1623b_timer:
1624include regular/timer.asm ; Timer
1625size_timer = $-b_timer
1626
1627b_partmain:
1628include regular/partmain.asm ; Regular Partition Routines
1629size_partmain = $-b_partmain
1630
1631b_partscan:
1632include regular/partscan.asm ; Partition Scanning
1633size_partscan = $-b_partscan
1634
1635b_bootmenu:
1636include regular/bootmenu.asm ; Boot-Menu
1637size_bootmenu = $-b_bootmenu
1638
1639b_password:
1640include regular/password.asm ; Password related
1641size_password = $-b_password
1642
1643b_other:
1644include regular/other.asm ; Other Routines
1645size_other = $-b_other
1646
1647b_main:
1648include setup/main.asm ; The whole AiR-BOOT SETUP
1649size_main = $-b_main
1650
1651b_math:
1652include regular/math.asm ; Math functions (like 32-bit multiply)
1653size_math = $-b_math
1654
1655b_txtother:
1656include text/txtother.asm ; All translateable Text-Strings
1657size_txtother = $-b_txtother
1658
1659b_txtmenus:
1660include text/txtmenus.asm ; All translateable Menu-text
1661size_txtmenus = $-b_txtmenus
1662
1663b_charset:
1664include text/charset.asm ; Special Video Charsets (if needed)
1665size_charset = $-b_charset
1666
1667b_conv:
1668include regular/conv.asm ; Various conversion routines
1669size_conv = $-b_conv
1670
1671b_virus:
1672include special/virus.asm ; Virus Detection / Anti-Virus
1673size_virus = $-b_virus
1674
1675b_billsuxx:
1676include special/f00k/billsuxx.asm ; Extended Partition - Microsoft-Hack
1677size_billsuxx = $-b_billsuxx
1678
1679b_sound:
1680include special/sound.asm ; Sound
1681size_sound = $-b_sound
1682
1683b_apm:
1684include special/apm.asm ; Power Managment Support
1685size_apm = $-b_apm
1686
1687
1688
1689;
1690; Cyrillic support.
1691;
1692IFDEF TXT_IncludeCyrillic
1693b_ccharset:
1694 include special/charset.asm ; Charset Support (e.g. Cyrillic)
1695size_ccharset = $-b_ccharset
1696ENDIF
1697
1698; Various debugging routines, uses AUXIO and CONV
1699IFDEF AUX_DEBUG
1700b_debug:
1701include regular/debug.asm ; Debug module
1702size_debug = $-b_debug
1703b_auxio:
1704include regular/auxio.asm ; Com-port support for debugging
1705size_auxio = $-b_auxio
1706ENDIF
1707
1708;
1709; We only include this if FX_ENABLED is defined.
1710; FX is disabled when debugging to have more room for debug-code.
1711; The module compiles to 50eh = 1294 bytes, so that is a lot.
1712;
1713IFDEF FX_ENABLED
1714b_fx:
1715include special/fx.asm ; l33t Cooper-Bars/Scrolling <bg>
1716size_fx = $-b_fx
1717ENDIF
1718
1719
1720 ;
1721 ; End of code marker.
1722 ;
1723 ; BOOKMARK: END OF CODE
1724 db 'BABE'
1725 db 'FACE'
1726
1727
1728; -----------------------------------------------------------------------------
1729; END OF CODE
1730; -----------------------------------------------------------------------------
1731code_end:
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742; -----------------------------------------------------------------------------
1743; BLDLEVEL INFORMATION
1744; -----------------------------------------------------------------------------
1745
1746 ; BOOKMARK: BLDLEVEL Information
1747 ORIGIN 068A0h
1748
1749;
1750; The space between this offset and code_end is the space
1751; available for code.
1752;
1753zzz_code_space = $ - code_end
1754
1755
1756bld_level:
1757 ;
1758 ; Here we insert the OS/2 BLDLEVEL Information.
1759 ; It is composed of the AiR-BOOT version-info and other
1760 ; information. It is unique for each release of AiR-BOOT.
1761 ;
1762
1763 ;
1764 ; ?? When AUX_DEBUG is enabled and the above org is active,
1765 ; the BLDLEVEL gets corrupted eventhough it gets inserted here
1766 ; explicitly. The effect is almost like an 'OR' or a merge
1767 ; with the already generated FX code.
1768 ; Tasm and JWasm produce different results.
1769 ; ??
1770 ;
1771 InsertBuildLevel
1772
1773
1774
1775
1776
1777;==============================================================================
1778; Sector 53
1779;==============================================================================
1780
1781 ;
1782 ; From here on, the layout of the image consists of:
1783 ; - AiR-BOOT Protection Image
1784 ; - AiR-BOOT Configuration
1785 ; - DriveLetters
1786 ; - Install Volume
1787 ; - Floppy/CDROM/BIOS BOOT ENTRIES
1788 ; - Internal Partition Table (IPT)
1789 ; - Hidden Partition Table (HPT)
1790 ; - MBR Backup
1791 ;
1792
1793 ;
1794 ; After that, the BSS follows with several runtime
1795 ; variables and structures.
1796 ; The BSS is not part of the image on disk of course.
1797 ;
1798
1799; -----------------------------------------------------------------------------
1800; PROTECTION IMAGE
1801; -----------------------------------------------------------------------------
1802
1803 ;
1804 ; This is the AiR-BOOT MBR Protection Image.
1805 ; The stuff generated here gets overwritten when the
1806 ; MBR_PROT module, which is assembled separately,
1807 ; gets binary merged.
1808 ; So you won't find the string below in the generated binary.
1809 ;
1810 ; BOOKMARK: AiR-BOOT MBR Protection Image
1811 ORIGIN 06900h
1812
1813
1814
1815
1816;
1817; Hardcoded to 768 bytes (MBR_PROT.ASM)
1818; The string below is searched for by the FIXCODE helper and *must* be
1819; page (256 bytes) aligned.
1820;
1821; It seems to be possible to shrink the protection-image to 768 bytes.
1822; That gives us an additional 256 bytes of code-space.
1823; MBR-PROT.ASM,FIXCODE.C,PARTMAIN.ASM and AIR-BOOT.ASM need to be adjusted for that.
1824; Also the granularity needs to change from 512 bytes to 256 bytes since
1825; 6900h is not a 512-byte boundary.
1826;
1827; 20120908 - Done.
1828;
1829MBR_Protection db 'AiR-BOOT MBR-Protection Image'
1830
1831 ; Just fill.
1832 ;~ db 1024-($-MBR_Protection) dup('M')
1833 db 768-($-MBR_Protection) dup('M')
1834
1835
1836
1837
1838
1839
1840
1841;==============================================================================
1842; Sector 55
1843;==============================================================================
1844; -----------------------------------------------------------------------------
1845; AiR-BOOT CONFIGURATION
1846; -----------------------------------------------------------------------------
1847
1848 ;
1849 ; This section contains the AiR-BOOT configuration.
1850 ; Note that it has a version that should be updated
1851 ; when stuff is added.
1852 ; Also add stuff to the end so that offsets of other
1853 ; variables remain vaild.
1854 ;
1855 ; BOOKMARK: AiR-BOOT Configuration Sector
1856 ORIGIN 06C00h
1857
1858Configuration:
1859 ; This is the signature for the AiR-BOOT Configuration.
1860 ; Note that this configuration section, like the code section,
1861 ; is CRC protected. This means that poking values in these
1862 ; sections on the disk will invalidate AiR-BOOT and cause it
1863 ; to halt. This is a protection method against other software
1864 ; modifying stuff in track 0.
1865 db 'AiRCFG-TABLE',0adh
1866 db 01h, 10h, 'U' ; "Compressed" ID String
1867 ; Version 1.02 was for code 1.06, 1.03 was internal
1868 ; and 1.04,1.05 and 1.06 do not exist.
1869 ;
1870 ; 1.07 was used with AB v1.07 and introduced the phase1
1871 ; system-name. For the rest it is compatible with v1.02.
1872 ;
1873 ; 1.0.8 is introduced with AB v1.0.8 and indicates the movement
1874 ; of several components and the packing of the hideparttable.
1875 ; The core configuration has not changed but the generated
1876 ; configuration has. The v1.0.8 installer handles upgrading.
1877 ;
1878 ; It has been decided that uneven minor numbers will be
1879 ; test-versions. Therefore v1.0.8 has been bumbed to v1.1.0.
1880 ;
1881 ; It is not required for the config to have the
1882 ; same version as the code, so in the future
1883 ; the code version might be higher than the
1884 ; config version if there are no changes to the latter.
1885 ;
1886
1887CFG_LastTimeEditLow dw 0 ; Last Time Edited Stamp (will incr every setup)
1888CFG_LastTimeEditHi dw 0 ; second 16 bit part...
1889
1890CFG_CheckConfig dw 0 ; Check-Sum for Configuration
1891
1892CFG_Partitions db 0 ; Count of partitions in IPT
1893CFG_MiscFlags db 1 ; Miscellaneous Flags (See EQUates)
1894CFG_PartDefault db 0 ; Default-Partition (Base=0)
1895
1896CFG_PartLast db 0 ; Which Partition was booted last time ? (Base=0)
1897CFG_TimedBoot db 0 ; Timed Boot Enable (for REAL Enable look TimedBootEnable)
1898CFG_TimedSecs db 15 ; Timed Boot - How Many Seconds Till Boot
1899CFG_TimedDelay dw 123 ; Timed Boot - Delay
1900CFG_TimedBootLast db 1 ; Timed Boot - Boot From Last Drive Booted From
1901CFG_RememberBoot db 1 ; Remember Manual Boot Choice
1902CFG_RememberTimed db 0 ; Remember if Timed Boot (if both disabled: Boot Default)
1903CFG_IncludeFloppy db 1 ; Include Floppy Drives in Boot-Menu
1904CFG_BootMenuActive db 1 ; Display Boot-Menu (if Disabled: Boot Default)
1905 ; v0.29+ -> 2 - Detailed Bootmenu
1906CFG_PartitionsDetect db 1 ; Autodetect New Partitions (Auto-Add!)
1907CFG_PasswordSetup db 0 ; Ask Password when entering Setup
1908CFG_PasswordSystem db 0 ; Ask Password when booting System
1909CFG_PasswordChangeBoot db 0 ; Ask Password when changing boot partition
1910CFG_ProtectMBR db 0 ; Protect MBR via TSR ?
1911CFG_IgnoreWriteToMBR db 0 ; Just ignore writes to MBR, otherwise crash
1912CFG_FloppyBootGetName db 0 ; Gets floppy name for display purposes
1913CFG_DetectVirus db 0 ; Detect Virus ?
1914CFG_DetectStealth db 0 ; Detect Stealth-Virus ?
1915CFG_DetectVIBR db 0 ; Detect BootRecord-Virus ?
1916CFG_AutoEnterSetup db 0 ; Automatic Enter Setup (first install!)
1917CFG_MasterPassword dw 0101Fh ; Encoded Password (this is just CR)
1918 dw 07A53h
1919 dw 0E797h
1920 dw 0A896h
1921CFG_BootPassword dw 0101Fh ; Another CR... ;-)
1922 dw 07A53h
1923 dw 0E797h
1924 dw 0A896h
1925 db 0 ; Rude-Protection - Removed since v0.28b
1926CFG_LinuxRootPartition db 0 ; Linux Root Partition (Base=0)
1927CFG_TimedKeyHandling db 0 ; Timed Key Handling (for Timed Boot)
1928 ; 0 - Do Nothing
1929 ; 1 - Reset Time
1930 ; 2 - Stop Time
1931CFG_MakeSound db 0 ; Should be clear ;)
1932CFG_FloppyBootGetTimer db 0 ; Floppy Name will get updated every 2 secs
1933CFG_ResumeBIOSbootSeq db 1 ; If BIOS Boot Sequence should be resumed
1934 ; 0 - Disabled
1935 ; 1 - CD-ROM
1936 ; 2 - Network
1937 ; 3 - ZIP/LS120
1938CFG_CooperBars db 0 ; If Cooper Bars should be shown
1939CFG_LinuxCommandLine db 75 dup (0) ; Linux Command Line
1940CFG_LinuxKrnlPartition db 0FFh ; FAT-16 Linux Kernel Partition (Base=0)
1941 ; FFh -> Disabled
1942CFG_LinuxDefaultKernel db 'DEFAULT', 4 dup (32), 0 ; Default Kernel Name
1943CFG_LinuxLastKernel db 11 dup (32), 0 ; Last-Booted Kernel Name
1944CFG_ExtPartitionMShack db 0 ; Extended Partition M$-Hack Global Enable
1945CFG_AutomaticBoot db 0 ; Automatic Booting (only one bootup)
1946CFG_PartAutomatic db 0 ; Partition-No for automatic booting
1947CFG_ForceLBAUsage db 1 ; LBA-BIOS-API forced on any HDD I/O
1948CFG_IgnoreLVM db 0 ; Ignores any LVM-Information
1949
1950
1951;
1952; THERE IS ROOM RESERVED HERE FOR MORE VARIABLES
1953;
1954
1955 ;
1956 ; Drive Letters.
1957 ;
1958 ; BOOKMARK: Stored Drive Letters
1959 ORIGIN 06CB0h
1960
1961
1962; -----------------------------------------------------------------------------
1963; DRIVE LETTERS
1964; -----------------------------------------------------------------------------
1965
1966;
1967; Moved here to make room for packed hiddenparttable.
1968; This gets filled with drive-letters that are assigned using the dl-feature.
1969;
1970DriveLetters db LocIPT_MaxPartitions dup (0)
1971 ; Format is:
1972 ;============
1973 ; Drive-Letter : BYTE (80h-C:, 81h-D:)
1974 ; --------------------> 1 Byte * 45
1975
1976
1977
1978; -----------------------------------------------------------------------------
1979; INSTALL VOLUME
1980; -----------------------------------------------------------------------------
1981
1982 ;
1983 ; Allways have the name of the installation volume
1984 ; at this offset.
1985 ; So future config changes will not break auto-install.
1986 ;
1987 ; BOOKMARK: Name of OS/2 Installation Volume
1988 ORIGIN 06D00h
1989
1990; SET(A)BOOT stores the volume name of the OS/2 system being installed here.
1991; It is truncated to 11 chars because AiR-BOOT currently does not support
1992; longer labelnames. The name is also capitalized.
1993OS2_InstallVolume db 0,'NOPHASEONE' ,0
1994
1995;
1996; THERE IS ROOM RESERVED HERE FOR MORE VARIABLES
1997;
1998
1999
2000; -----------------------------------------------------------------------------
2001; FLOPPY/CDROM/BIOS BOOT ENTRIES
2002; -----------------------------------------------------------------------------
2003
2004 ;
2005 ; 06DABh - 06C00h = 01ABh = 427 bytes.
2006 ; Entries allocated down from 06E00 boundary.
2007 ;
2008 ; BOOKMARK: Floppy/CD-ROM/BIOS Boot Entries
2009 ORIGIN 06DABh ; 427 Boundry
2010
2011; (432 - 5 = 427)
2012AutoDrvLetter db 0
2013AutoDrvLetterSerial dd 0
2014
2015; This entry is also 34 bytes long (466 - 34 = 432)
2016BIOScontIPTentry:
2017 db 0, 0, 0, 0, ' '
2018 db 0, 0FEh, Flags_Bootable
2019 dw 0 ; No Checksum :)
2020 db 0, 1, 0
2021 db 0, 1, 0 ; Location of Partition/Boot Record
2022 dd 0, 0
2023
2024; VIR variables are for the AiR-BOOT Anti Virus Code
2025; Most of them are backups of Interrupt Points, so we can check, if a
2026; stealth virus is on-line, we can intercept its call.
2027; Normal (non stealth) virus are trapped simply by rereading the MBR sector.
2028; If a virus is found, we will restore MBR from Sektor 60/62 and stop the
2029; system from working, so the user has to press reset.
2030; That's saver than a Reboot.
2031;
2032; If a virus is found on the partition to boot, the system will ONLY halt,
2033; nothing more, because we can not remove it. The user shall do it :)
2034; Those viruses are detected via a real nasty method...Checksum-Checking of the
2035; boot-record, which is to be executed. If it does not match the one in our
2036; internal partition table, we will stop. You may however switch this detection
2037; off or just reset it by switching 'VIBR Detection'.
2038
2039; 478 - 12 = 466 ; 466 Sub-Part
2040CFG_VIR_INT08 dd 0 ; pointer to saved 08h entry point
2041CFG_VIR_INT13 dd 0 ; pointer to saved 13h entry point
2042CFG_VIR_INT1C dd 0 ; pointer to saved 1Ch entry point
2043
2044; 478 Boundry (512-34)
2045; This entry is also 34 bytes long
2046FloppyIPTentry db 0, 0, 0, 0, 'FloppyDrive'
2047 db 0, 0FFh, Flags_Bootable
2048 dw 0 ; No Checksum :)
2049 db 0, 1, 0
2050 db 0, 1, 0 ; Location of Partition/Boot Record
2051 dd 0, 0
2052
2053
2054
2055; -----------------------------------------------------------------------------
2056; INTERNAL PARTITION TABLE (IPT)
2057; -----------------------------------------------------------------------------
2058
2059 ;
2060 ; AiR-BOOT Internal Partition Table (IPT)
2061 ;
2062 ; BOOKMARK: Internal Partition Table
2063 ORIGIN % (image_size - 0a00h - (image_size - image_size_60secs))
2064
2065
2066;
2067; Rousseau: This is the start of the AiR-BOOT IPT
2068;
2069PartitionTable db (LocIPT_MaxPartitions * LocIPT_LenOfIPT) dup (0)
2070; no-partitions detected... :]
2071; db 1, 0, 0, 0, 'Harddisc 1'
2072; db 0, 0FFh, Flags_BootAble
2073; dw 0 ; No Checksum :)
2074; db 0, 0, 1
2075; db 0, 0, 1 ; Location of Partition/Boot Record
2076; dd 0, 0
2077
2078 ; Format is:
2079 ;============
2080 ; SerialNumber * 4
2081 ; PartitionName * 11
2082 ; Drive * 1
2083 ; SystemID * 1 (means the partition type)
2084 ; Flags * 1
2085 ; Checksum * 2 (for virus checking)
2086 ; LocationBegin * 3 (where the partition begins)
2087 ; LocationPartTab * 3 (where the partition table is)
2088 ; AbsoluteBegin * 4 (where the partition begins, in absolute sectors)
2089 ; AbsolutePartTab * 4 (where the partition table is, in absolute sectors)
2090 ; --------------------> 34 Bytes (total maximum partition-entries = 30)
2091
2092
2093
2094 ; No need to check overlap here because this string will
2095 ; be overwritten if the maximum partition count is reached.
2096 ; So this is not a critical boundary.
2097 ORG (image_size - 600h - (image_size - image_size_60secs) / 2 - 10)
2098
2099 db 'AiRBOOTPAR' ; 1K internal partition table
2100
2101
2102
2103; -----------------------------------------------------------------------------
2104; HIDDEN PARTITION TABLE (HPT)
2105; -----------------------------------------------------------------------------
2106
2107 ;
2108 ; Hidden Partition Table (6-bit packed as of v1.0.8)
2109 ;
2110 ; BOOKMARK: Hidden Partition Table (packed)
2111 ORIGIN % (image_size - 600h - (image_size - image_size_60secs) / 2)
2112
2113HidePartitionTable db (LocIPT_MaxPartitions * LocHPT_LenOfHPT) dup (0FFh)
2114 ; Format is:
2115 ;============
2116 ; PartitionPtr : BYTE * 30
2117 ; --------------------> 30 Bytes * 45
2118
2119;
2120; Driveletters were here.
2121; Moved down to make room for packed hideparttable.
2122;
2123
2124
2125 ;
2126 ; End of hidden partition table.
2127 ; Check overlap here for security reasons.
2128 ;
2129 ORIGIN % (image_size - 200h - 5)
2130
2131; 79fa - end of packed hide table
2132 db 'ABHID' ; 1K internal Hide-partition table
2133
2134
2135
2136
2137;==============================================================================
2138; Sector 62
2139;==============================================================================
2140; -----------------------------------------------------------------------------
2141; MBR BACKUP
2142; -----------------------------------------------------------------------------
2143
2144 ;
2145 ; AiR-BOOT MBR Backup.
2146 ;
2147 ; BOOKMARK: MBR Backup
2148 ORIGIN % (image_size - 200h)
2149
2150
2151MBR_BackUpMBR db 'AiR-BOOT MBR-BackUp',\
2152 ' - Just to fill this sector with something',0
2153AirBootRocks db 'AiR-BOOT Rocks!',0
2154
2155 db (512 - ($-MBR_BackUpMBR) - 2) dup('M')
2156
2157 ; End of Image signature.
2158 ;
2159 ORIGIN % (image_size - 2)
2160 dw 0BABEh
2161
2162
2163 ;
2164 ; End of Image.
2165 ;
2166 ORIGIN % (image_size)
2167image_end:
2168
2169;
2170; Terminate LDRIMAGE segment.
2171;
2172IFDEF SEGMENTED
2173LDRIMAGE ENDS
2174ENDIF
2175
2176
2177
2178
2179
2180
2181
2182;##############################################################################
2183; BSS SEGMENT
2184;##############################################################################
2185
2186; BOOKMARK: BSS Segment
2187
2188;
2189; Open BSS segment.
2190;
2191IFDEF SEGMENTED
2192VOLATILE SEGMENT USE16 PUBLIC 'BSS'
2193ENDIF
2194
2195
2196
2197sobss:
2198sobss_abs = offset sobss + image_size
2199;------------------------------------------------------------------------------
2200
2201
2202 ;
2203 ; This is the actual start of the BSS.
2204 ; In the past however, we have had a code-loop that went out of bounds,
2205 ; overwriting the start of the BSS.
2206 ;
2207 ; Because important runtime data is stored in the BSS, we offset it
2208 ; by 400h bytes. Since the loader-image is always 62 sectors, which
2209 ; makes it 7c00h in size, the runtime data starts at 8000h.
2210 ; This is the 'BeginOfVariables' location.
2211 ;
2212
2213
2214;
2215; If segmented, offsets are relative to the BSS segment.
2216; They are resolved at link-time.
2217; If not segmented, offsets are relative to the CODE segment.
2218;
2219IFDEF SEGMENTED
2220 ORG 00400h ; 7c00h + 400h = 8000h
2221ELSE
2222 ORG 08000h ; 8000h
2223ENDIF
2224
2225
2226; -----------------------------------------------------------------------------
2227; START OF BSS DATA
2228; -----------------------------------------------------------------------------
2229; This space actually gets initialized in PreCrap to NUL (till EndOfVariables)
2230BeginOfVariables:
2231BeginOfVariablesAbs = offset BeginOfVariables + image_size
2232
2233
2234; -----------------------------------------------------------------------------
2235; SECTOR BUFFERS
2236; -----------------------------------------------------------------------------
2237; BOOKMARK: Sector Buffers
2238PartitionSector db 512 dup (?) ; Temporary Sector for Partition
2239PBRSector db 512 dup (?) ; Temporary Sector for JFS/HPFS writeback
2240LVMSector db 512 dup (?) ; Temporary Sector for LVM
2241TmpSector db 512 dup (?) ; Temporary Sector
2242Scratch db 512 dup (?) ; Scratch buffer
2243 ALIGN 16
2244
2245
2246; -----------------------------------------------------------------------------
2247; NEW PARTITION TABLE
2248; -----------------------------------------------------------------------------
2249; Everything used to build a new IPT and reference it to the old one
2250; BOOKMARK: New Partition Table
2251NewPartTable db 1536 dup (?) ; New Partition Table
2252 ALIGN 16
2253
2254
2255; -----------------------------------------------------------------------------
2256; NEW HIDE PARTITION TABLE
2257; -----------------------------------------------------------------------------
2258; BOOKMARK: New Hide-Partition Table
2259NewHidePartTable db LocIPT_MaxPartitions * LocHPT_LenOfHPT dup (?)
2260 ALIGN 16
2261
2262
2263; -----------------------------------------------------------------------------
2264; NEW DRIVE LETTERS
2265; -----------------------------------------------------------------------------
2266; BOOKMARK: Logical Drive-Letters
2267NewDriveLetters db LocIPT_MaxPartitions dup (?)
2268 ALIGN 16
2269
2270
2271; -----------------------------------------------------------------------------
2272; PARTITION SIZE TABLE
2273; -----------------------------------------------------------------------------
2274; Size-Table (6 bytes per partition)
2275; BOOKMARK: Partition Size Table
2276PartitionSizeTable db LocIPT_MaxPartitions * 6 dup (?)
2277 ALIGN 16
2278
2279
2280; -----------------------------------------------------------------------------
2281; PARTITION POINTERS
2282; -----------------------------------------------------------------------------
2283; Maximum is 52 word entries till now
2284; BOOKMARK: Partition Pointers
2285PartitionPointers dw 52 dup (?)
2286 ALIGN 16
2287
2288; Count of total Partition Pointers
2289PartitionPointerCount db ?
2290 ALIGN 16
2291
2292
2293; -----------------------------------------------------------------------------
2294; XREF TABLE
2295; -----------------------------------------------------------------------------
2296; X-Reference Table (holds new partnr, index is old part nr)
2297; BOOKMARK: Xref Table
2298PartitionXref db LocIPT_MaxPartitions dup (?)
2299 ALIGN 16
2300
2301
2302; -----------------------------------------------------------------------------
2303; VOLUME LETTERS
2304; -----------------------------------------------------------------------------
2305; Volume-Letters
2306; 0 - no LVM support
2307; 1 - LVM support, but no letter
2308; 'C'-'Z' - assigned drive letter
2309; BOOKMARK: Volume Drive Letters
2310PartitionVolumeLetters db LocIPT_MaxPartitions dup (?)
2311 ALIGN 16
2312
2313
2314; -----------------------------------------------------------------------------
2315; MISC VARS AND FLAGS
2316; -----------------------------------------------------------------------------
2317; BOOKMARK: Misc Vars and Flags
2318TotalHarddiscs db ? ; Total harddrives (by POST)
2319LBASwitchTable db 128 dup (?) ; Bit 25-18 for CHS/LBA Switching
2320NewPartitions db ? ; Freshly found partitions
2321 ; Independent of SaveConfiguration
2322TooManyPartitions db ? ; Non-zero if too many partitions found
2323
2324VideoIO_Segment dw ? ; Segment for Video I/O
2325
2326ExtendedAbsPos dd ? ; Extended Partition Absolute Position
2327ExtendedAbsPosSet db ? ; If Absolute Position set
2328
2329CurPartition_Location dw 4 dup (?) ; Where did current partition come from?
2330CurIO_UseExtension db ? ; 1-Use INT 13h EXTENSIONS
2331 ; (filled out by PreCrap)
2332CurIO_Scanning db ? ; 1-AiR-BOOT is scanning partitions
2333 ; (for detailed error message)
2334 ALIGN 16
2335
2336
2337; -----------------------------------------------------------------------------
2338; MENU RELATED VARS
2339; -----------------------------------------------------------------------------
2340Menu_EntrySelected db ? ; Which partition we boot this time...
2341Menu_UpperPart db ? ; Which number (Base=0) is the partition upper pos
2342Menu_AbsoluteX db ? ; Pos where Menu stuff starts
2343Menu_TotalParts db ? ; Copy of CFG_BootParts
2344Menu_TotalLines db ? ; Total Lines on Screen used for BootMenu
2345Menu_EntryDefault db ? ; Default Entry in filtered View
2346Menu_EntryLast db ? ; LastBooted Entry in filtered View
2347Menu_EntryAutomatic db ? ; Automatic Entry in filtered View
2348 ; - All adjusted to menu locations
2349 ALIGN 16
2350
2351
2352; -----------------------------------------------------------------------------
2353; PARTITION RELATED VARS
2354; -----------------------------------------------------------------------------
2355PartSetup_UpperPart db ? ; Partition-Setup (like Menu_UpperPart)
2356PartSetup_ActivePart db ? ; Active Partition
2357PartSetup_HiddenUpper db ? ; (like Menu_UpperPart)
2358PartSetup_HiddenX db ? ; Pos for Hidden-Setup
2359PartSetup_HiddenAdd db ? ; Adjust for Hidden-Setup
2360 ALIGN 16
2361
2362
2363; -----------------------------------------------------------------------------
2364; TIMER / SETUP RELATED VARS
2365; -----------------------------------------------------------------------------
2366TimedBootEnable db ? ; Local Enable/Disable for timed boot
2367TimedTimeOut dd ? ; TimeOut Timer for TimedBoot (too much time here;)
2368TimedSecondLeft db ? ; How many seconds are left till boom ?
2369TimedSecondBack db ? ; To get a modification noticed
2370TimedBootUsed db ? ; Timed Boot used for bootup ?
2371FloppyGetNameTimer dd ? ; Timer for Floppy-Get-Name
2372SETUP_KeysOnEntry db ? ; which Shift Status was there, when booting ?
2373SETUP_ExitEvent db ? ; Exit Event to end SETUP
2374TempPasswordEntry db 17 dup (?)
2375SETUP_OldPwd db 17 dup (?)
2376SETUP_NewPwd db 17 dup (?)
2377SETUP_VerifyPwd db 17 dup (?)
2378StartSoundPlayed db ?
2379ChangePartNameSave db ? ; Save label after user-edit ?
2380SyncLvmLabels db ? ; Sync LVM labels after user-edit ?
2381 ALIGN 16
2382
2383
2384; -----------------------------------------------------------------------------
2385; FX RELATED VARS
2386; -----------------------------------------------------------------------------
2387FX_UseCount dw ?
2388FX_OverallTimer dw ?
2389FX_WideScrollerTimer dw ?
2390FX_WideScrollerCurPos dw ?
2391FX_WideScrollerSpeed db ?
2392FX_WideScrollerSpeedState db ?
2393FX_WideScrollerDirection db ?
2394FX_WideScrollerAbsDirection db ?
2395FX_WideScrollerBounceSpeed db ?
2396FX_CooperBarsTimer dw ?
2397 ALIGN 16
2398
2399; Dynamically Generated Tables - do not need to get initialized with NUL
2400FX_CooperColors db 672 dup (?) ; 7 cooper bars*96 - runtime calculated
2401FX_CooperState db 7 dup (?)
2402FX_SinusPos db 7 dup (?)
2403FX_CooperPos dw 7 dup (?)
2404 ALIGN 16
2405
2406
2407; -----------------------------------------------------------------------------
2408; CHARSET BUFFER
2409; -----------------------------------------------------------------------------
2410CharsetTempBuffer db 4096 dup (?) ; Uninitialized Charset buffer
2411 ALIGN 16
2412
2413
2414; -----------------------------------------------------------------------------
2415; LVM CRC TABLE
2416; -----------------------------------------------------------------------------
2417LVM_CRCTable dd 256 dup (?) ; LVM-CRC (->SPECiAL\LVM.asm)
2418 ALIGN 16
2419
2420
2421; -----------------------------------------------------------------------------
2422; LVM DRIVE-LETTER MAP
2423; -----------------------------------------------------------------------------
2424; Get's initialized at startup to: 00000011111111111111111111111100b
2425; Meaning A,B not free; C-Z free, rest unused. (right to left)
2426; Each partition with an assigned drive-letter clears a bit in this map.
2427FreeDriveletterMap dd ?
2428 ALIGN 16
2429
2430
2431; -----------------------------------------------------------------------------
2432; OS/2 PHASE1 RELATED
2433; -----------------------------------------------------------------------------
2434Phase1Active db ?
2435OldPartitionCount db ?
2436 ALIGN 16
2437
2438
2439; -----------------------------------------------------------------------------
2440; ARRAY OF DISK INFORMATION STRUCTURES
2441; -----------------------------------------------------------------------------
2442; Array of DISKINFO structures
2443DiskInformation db MaxDisks dup(DISKINFO_Size dup(?))
2444 ALIGN 16
2445
2446
2447; -----------------------------------------------------------------------------
2448; INT13X DAP
2449; -----------------------------------------------------------------------------
2450; Disk Address Package that holds information for LBA-access using INT13X
2451INT13X_DAP db ? ; Size of paket, inserted by code
2452 db ? ; Reserved
2453INT13X_DAP_NumBlocks dw ? ; Number of blocks
2454INT13X_DAP_Transfer dd ? ; Transfer Adress
2455INT13X_DAP_Absolute dd ? ; Absolute Sector
2456 dd ? ; Second Part of QWORD
2457INT13X_DAP_Size = $-offset [INT13X_DAP] ; Calculated size
2458 ALIGN 16
2459
2460
2461; -----------------------------------------------------------------------------
2462; DEBUG
2463; -----------------------------------------------------------------------------
2464; Some debug area.
2465dbg_scratch db 512 dup(?)
2466 ALIGN 16
2467
2468
2469; End of transient variables.
2470EndOfVariables:
2471EndOfVariablesAbs = offset EndOfVariables + image_size
2472
2473
2474
2475; -----------------------------------------------------------------------------
2476; OLD AND NEW STACKS
2477; -----------------------------------------------------------------------------
2478; BOOKMARK: Storage for Old and New Stack Pointers
2479;
2480; These need to be outside the variable section because AiR-BOOT can restart
2481; itself in debug-mode. If the OldSP and OldSS would be in the variable area,
2482; they would be cleared on AiR-BOOT restart.
2483;
2484
2485; The variable section is cleared word-wise, so it could clear one byte extra
2486; depending on the alignment and size. This DD prevents the OldSP and OldSS
2487; to be partly overwritten by the clearing routine.
2488 dd ?
2489 ALIGN 16
2490
2491; SS:SP from before our relocation.
2492; The registers values when the BIOS transferred control to us were pushed
2493; on this stack.
2494
2495OldSP dw ?
2496OldSS dw ?
2497
2498; SS:SP currently in use.
2499; They are temporarily dumped here so we can pop the resgisters from
2500; the old stack to display them in debug mode.
2501CurrentSP dw ?
2502CurrentSS dw ?
2503 ALIGN 16
2504
2505; Usually, commits are buildable and some minor checking has been done that
2506; whole disks do not get wiped. However, there are situations where stuff is
2507; in such a flux that it would be better to do non-buildable commits.
2508; That makes it possible to record the changes piecemeal without the danger of
2509; accidently using the resulting loader. Of course everyone is clever enough
2510; to _never_ build commits marked as 'testing' and install the result in
2511; environments where wiping all attached disks and sticks would be a problem...
2512force_build_error dd 0f000h dup(?)
2513
2514;
2515; End of BSS segment.
2516;
2517eobss:
2518eobss_abs = offset eobss + image_size
2519;
2520; Total RAM occupied, including BSS.
2521; BASE is 8000:0000, LIMIT is 8000:FFFF.
2522; Note that the LDRIMAGE is of constant size, 7C00h = 62 sectors of 512 bytes.
2523;
2524resident_size = offset eobss + image_size
2525
2526;
2527; Close BSS segment.
2528;
2529IFDEF SEGMENTED
2530 VOLATILE ENDS
2531ELSE
2532 LDRIMAGE ENDS
2533ENDIF
2534
2535 ; BOOKMARK: End of Module
2536 END AiR_BOOT
2537
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