source: trunk/BOOTCODE/AIR-BOOT.HIS@ 52

;
; AiR-BOOT (c) Copyright 1998-2008 M. Kiewitz
;
; This file is part of AiR-BOOT
;
; AiR-BOOT is free software: you can redistribute it and/or modify it under
;  the terms of the GNU General Public License as published by the Free
;  Software Foundation, either version 3 of the License, or (at your option)
;  any later version.
;
; AiR-BOOT is distributed in the hope that it will be useful, but WITHOUT ANY
;  WARRANTY: without even the implied warranty of MERCHANTABILITY or FITNESS
;  FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
;  details.
;
; You should have received a copy of the GNU General Public License along with
;  AiR-BOOT. If not, see <http://www.gnu.org/licenses/>.
;




; ------------------------------------------------
; Rousseau: Fixes, Enhancements and fresh bugs :-)
; ------------------------------------------------
;
; v1.0.8-rc3-bld20120909
; ----------------------
; # Added Show LVM Drive Letters in SETUP/BASIC #
;   This will toggle the display of LVM drive-letters in the main menu.
;   By default this option is enabled.
;
; # Reduced MBR Protection Image from 1024 bytes to 768 bytes #
;   The fight for code-space continues...
;   Luckily the MBR Protection Image code does not exceed 768 bytes,
;   so that gives us another 256 bytes of precious code-space.
;   Now the non-EN versions are happy again.
;   Note that the alignment for the image changed from 512 to 256 bytes.
;   MBR-PROT.ASM, FIXCODE.C, PARTMAIN.ASM and AIR-BOOT.ASM have been
;   adjusted for this change.
;
; # Updating from v1.06 now also copies over drive-letters #
;   When the user has forced drive-letters in v1.06 these will be copied over
;   to the v1.0.8 configuration when upgrading.
;   Because the drive-letter feature is broken in v1.07, the drive-letter
;   table does not get copied over when upgrading from v1.07.
;
; # Fixed a minor bug with displaying LVM drive-letters #
;   When more partitions that can be displayed were present, scrolling the
;   menu would not scroll the drive-letter. Fixed.
;
; # Added DOCU directory for documentation #
;   This contains the AiR-BOOT User Manual in Open Office .odt-format.
;   To also have OS/2 INF format, a transformation script and sheet have been
;   created to convert the .odt document to an ipf-source that can be compiled
;   with Watcoms wipfc ipf compiler. (IBM ipfc does not work correctly)
;   This makes it possible to write documentation in OOo Writer and export that
;   to PDF and INF format.
;
; # Fixed a bug with regard to the drive-letter feature #
;   When partitions were deleted, and some partitions above the deleted
;   partition(s) had a drive-letter forced, these partitions would lose this
;   assignment. This bug is also present in v1.06.
;
; # Implemented a very simple interactive debugger #
;   Making use of the main menu-loop, pressing a digit or a letter activates
;   some debugging routine. Mostly such a routine dumps a part of the internal
;   state to the com-port. Other purposes are the interrogation of certain
;   BIOS functions, as these can differ substantially between machines.
;
; # Made FX-code optional to compile in #
;   The FX-code supplies the shifting screen-effects when 'Cooper Bars' is
;   enabled in the setup. With the current enhancements made however,
;   there is a continuous lack of code-space, especially when debug-code is
;   included during development. The FX-code occupies some 1200 bytes, a space
;   that can be put to better use. Therefore inclusion the FX-code has been
;   made conditional to make room for either debugging or future new features.
;
; # Also write PBR to HPFS #
;   Earlier, a fix was made to write a modified PBR back in case JFS was used.
;   This was done to enable the drive-letter feature on JFS, since the PBR
;   JFS-bootcode does not use the supplied PBR in memory.
;   With the enhancements in the drive-letter feature, the HPFS PBR needs to
;   be updated on disk also, to cope with zero drive-letters in the HPFS PBR.
;
; # Added drive-letters in display for LVM volumes #
;   A populair request was to show drive-letter information in the menu.
;   Drive-letters however, are OS specific and AiR-BOOT cannot accurately
;   predict what drive-letter DOS would assign to what partition.
;   eCS LVM drive-letters however are stored in the LVM-record and can thus
;   be displayed. This has been implemented.
;
; # Enhanced drive-letter feature #
;   Enable multiple eComStation installations using the same drive-letter
;   This makes it possible to clone a system with XCOPY /h /e /s /t /r /v
;   to another drive and have that boot from the same drive-letter.
;   (Or installing to the same drive by hiding the other system)
;
; # Removed Force LBA Usage from Setup #
;   When AiR-BOOT is installed on an USB-stick, there is a possibility that
;   the CHS-geometry varies between different machines where the stick is
;   booted. This would invalidate the CHS-values in the partition table
;   and also the values that were stored in the AiR-BOOT's internal partition
;   table, the IPT.
;   To prevent more nasty things like below from happening, LBA-addressing
;   is now always used and the setting has been removed from the setup-menu.
;   While this may prevent AiR-BOOT from running on very old systems,
;   the focus of AiR-BOOT development is geared towards the future.
;   Such old systems can use v1.06.
;
; # Added extra MBR protection #
;   When AiR-BOOT is active, it is only AiR-BOOT that writes to the MBR.
;   To protect the MBR from programming errors, like the one below,
;   any write to the MBR is now checked for validity.
;   In essence this is protecting your MBR from bad programming done by me...
;
;!## Fixed a very very nasty bug that can destroy the MBR on multiple disks ##!
;   When Force BIOS-LBA usage is disabled (the default is enabled), and the
;   the driveletter feature is being set, and valid LVM information is present,
;   then the MBR of the disk containing the partition of which the driveletter
;   is changed will be overwritten with the LVM sector !
;   In addition, if the driveletter was already in use by another partition
;   on another disk, the MBR of that disk will be overwritten too !!
;
; # Fixed a nasty bug when eCS phase1 is active #
;   When creating a partition in a free space between partitions for
;   eCS installation, the phase1 boot-through code would calculate the
;   wrong index for the new partition. As a result the next partition
;   would be auto-booted instead of the newly installed system.
;   This has been fixed.
;   This bug is also present in v1.07 and does not apply to previous versions.
;
; v1.0.8-rc2-bld20120423
; ----------------------
; # Fixed some minor Installer bugs with SPT < 63 #
;   Some extra var StatusCode was used instead of Status_Code.
;   This caused too few tracks not to be reported.
;   No installation was done however.
;   This bug is also present in the v1.06 code.
;
; # Fixed Installer to handle packed hideparttable #
;   Implemented upgrading from v1.06 directly to v1.0.8.
;   Fixed minor stuff when upgrading from v1.06 to v1.07.
;   Hide partition configuration is now preserved when upgrading.
;   Fixed minor display bug when SPT < 63.
;
; # Implemented DOS code in C cross-platform installer
;   There is now one C source for 4 platforms:
;   DOS,WIN32,OS2 and LINUX (Linux portion not ready yet)
;   This obsoletes AIRBOOT.ASM/AIRBOOT.COM.
;   DOS Installer is now AIRBOOTD.EXE.
;
; # Merged 16-bit Assembler bitfield code to the Installer #
;   The installer needs to handle the v1.0.8 configuration.
;   This requires access to the 6-bit packed 'hideparttable'.
;   To 'not-reinvent-the-wheel', by coding this in C, the Assembler
;   bitfield functions are integrated using Open Watcom's '_asm' capability.
;   It may not be pretty and the functions themselves are limited,
;   but this method prevents maintaining seperate Asm and C implementations.
;   Will be improved later.
;
; # Implemented BLDLEVEL support #
;   AIRBOOT.BIN, the Installers and SET(A)BOOT now support OS/2 BLDLEVEL
;   information. This enhances identification and problem tracking/solving.
;   While BLDLEVEL is an OS/2 command, the BLDLEVEL information itself can
;   be embedded in any binary. Invoking BLDLEVEL from within OS/2 on, let's
;   say, the AIRBOOTL.ELF Linux executable, will also show the BLDLEVEL info.
;   A slight deficiency of BLDLEVEL is that is forces a format on the version.
;   So, AiR-BOOT v1.0.8 will be shown as v1.00.8.
;
; # Added support for Masm6 and Wasm v1.9 -- Experimental use only #
;   Trying to assemble with Masm6 or Wasm v1.9 reveiled some interesting
;   behavior aspects in general. While this version can now be assembled with
;   Masm6 and Wasm too, this was only done to get a 'cross-feeling' for this
;   project. Future versions will drop support for Tasm, Masm6 and Wasm since
;   much conditional assembly is needed to support all of them. This was an
;   experimental excercise only. JWasm is the assembler of choise for this
;   project and any future versions.
;
; # Implemented stop scanning when max. partitions limit exceeded #
;   Previous versions halted the system when the maximum number of partitions
;   that can be handled (45) was exceeded.
;   This required the user to boot from alternate media to correct the problem.
;   Now, when the partition limit is exceeded, AiR-BOOT displays a pop-up
;   and waits for a key-press. When the user presses a key, AiR-BOOT continues
;   and the boot-menu is shown, enabling the user to boot a system to correct
;   the problem. To indicate this situation, the color of the selection-bar
;   is displayed in red.
;
; # Fixed hiding partitions above old max 30-partitions limit #
;   Hiding partitions is a per partition setting and it is kept in a table
;   in the AiR-BOOT image on disk. In previous versions, including v1.0.8-rc1,
;   this table still held the old number of maximum partitions (30).
;   So configuring a hide-setting for partitions >30 or hiding more than
;   30 partitions per partition would not work properly.
;   Unfortunately, there was no room to expand this table, since it resides
;   just below the MBR backup, at the end of the AiR-BOOT image.
;   To work around this, the table now uses a 6-bits packed format and the
;   drive-letter array, which followed this table has been moved elsewhere.
;   This is a change in the configuration layout since the previous version,
;   so the config-version has been bumped to v1.0.8.
;   TODO: Add upgrade-code to the installer to cope with this.
;
; # Removed requirement for LVM P and V name to be the same to edit #
;   However, when both are the same before the edit, the V name will be
;   synved to the P name to have them both the same again after the edit.
;   If they differ, only the V name is updated.
;
; # Trying to edit the label of a type 0x35 partition now shows a popup #
;   The user is informed that type 0x35 labels cannot be edited.
;
; # Type 0x35 partitions cannot be added to the AB-menu anymore #
;   They are not bootable anyway. The user is informed by a popup.
;
; # De-tasemized the Assembler sources for JWasm compatibility #
;   AiR-BOOT can now be built using JWasm, which is the preferred
;   assembler as of this release. Tasm support will be dropped in the future.
;
; # Completely reworked the build-system #
;   Everything is now done with Makefiles using WMake, Wlink and the
;   C/C++ Compilers from the Open Watcom development tools together with JWasm.
;   This obsoletes tasm, tlink and exe2bin.
;
; # Cross-Platform support #
;   AiR-BOOT and it's helpers can now be built on: DOS, Win32, OS/2 and Linux.
;
; # Rewrote FIXCODE.ASM in C so the tool-chain is not dependent on a DOS .COM #
;   Now FIXCODE is built platform-specific and takes care of the embedding
;   of MPR-protection image.
;
; # Created FIXCODE bash-script to accomplish embedding of MBR-protection #
;   Building on Linux requires that no DOS-tools are used in the tool-chain.
;   This script essentially performs the same functionality but does not check
;   certain conditions, like image-too-big, etc.
;   It is a 'quick-hack' until the Linux version of FIXCODE is operational.
;
; v1.0.8-rc1-bld20120124
; ----------------------
; # Changed version format to be more WarpIN compatible #
;   This is a cosmetic change only, the internal format has not changed.
;
; # Show LVM VolumeName instead of LVM PartitionName #
;   Previous versions of AiR-BOOT used the LVM PartitionName as the Label
;   if LVM-info was present for the partition.
;   This is inconsistent with MiniLVM which shows the LVM VolumeName.
;   Starting with v1.0.8 the LVM VolumeName is displayed.
;
; # LVM Partition and Volume name Synchronization #
;   Changing the Label of a partition with LVM-info now synchronizes
;   the LVM Partition Name with the LVM Volume Name.
;   This is the same behavior as MiniLVM.
;   Note however that the Label can only be changed when both the
;   LVM PartitionName and LVM VolumeName are the same.
;   See protected editing below.
;
; # Protected editing of the Label when LVM-info is present #
;   When the LVM VolumeName differs from the LVM PartitionName, the user can
;   edit the label but it will not be saved to the LVM record on disk.
;   This is to protect configurations created with the classic LVM tool.
;   Since MiniLVM assigns the same name to both the Partition and the Volume,
;   the Label can be edited and will be saved for such partitions.
;   To further protect a given configuration, LVM volumes with type 0x35
;   cannot be edited at all. This is to ensure that the LVM PartitionNames
;   remain unique when Spanning Volumes are used.
;
; # Editing the Label appended spaces #
;   When editing and changing the Label of a System using SETUP,
;   trailing spaces were stored in the LVM Volume and Partition names.
;   These labels need to be padded with zero's.
;   This has been fixed.
;   This bug is also present in v1.06.
;
; # Reworked Primary Partition <-> LVM-info association #
;   The previous way was to use a 1:1 correspondence between the PT-index
;   and the LVM-index. However, when the PT is cross-linked, lower entries
;   pointing to higher locations on the disk, or vice-versa, incorrect
;   LVM-info was associated. Such a cross-linked PT is sometimes generated
;   by the LVM engine when creating or deleting multiple partitions at once.
;   Best is to intermediately save after creating or deleting a partition
;   with (Mini)LVM.
;   The new way is to search the LVM-entries for the partition requested.
;
; # Reworked MBR-code to provide two I13X signatures #
;   The normal LVM MBR-code uses a special setup to indicate Int13X capability.
;   It contains the instruction, MOV EAX,'X31I', and some software checks
;   for the presence of the 'I13X' string in the MBR.
;   However, the location of this instruction differs between eCS 1.x and
;   eCS 2.x LVM MBR-code.
;   For compatibility, the v1.0.8 MBR has the 'I13X' string at both locations.
;
; # Fixed booting older eCS installations on HPFS #
;   When restoring systems from archive or otherwise generated systems,
;   the HPFS BPB sometimes lacked information that AiR-BOOT did not fill in.
;   The result was that a wrong partition was booted or that booting
;   stalled with the "unable to operate harddisk" message.
;   This has been fixed.
;
; # Fixed booting Windows from a logical partition with loader on FAT32 #
;   Depending on the configuration, sometimes the NTLDR could not be found.
;   This has been fixed.
;
; # Fixed drive-letter feature which was broken in v1.07 #
;   a)  v1.07 did remember the drive-letter feature was active for a partition,
;       but it failed to store the drive-letter because too few configuration
;       sectors were saved. This resulted in arbitrary values to be assigned
;       to the drive-letter for the partition.
;   b)  The JFS PBR-code does not use the in-memory BPB but uses the one
;       that is on disk. This prevented AiR-BOOT from passing the user assigned
;       drive-letter. AiR-BOOT now inserts the drive-letter in the BPB on disk,
;       but only if the partition is JFS.
;       AB v1.06 is also unable to use the drive-letter feature on JFS.
;   As a convenience, a drive-letter in the dl-feature pop-up can now be set
;   to "Disabled" by pressing backspace.
;   (As opposed to arrowing up/down to get to the "Disabled" entry)
;
; # Fixed stuck phase1 indicator when wrong name entered #
;   When using SET(A)BOOT /4:NAME with the MEMDRIVE env-var set,
;   and NAME being a non-existing partition, the phase1 indicator
;   would stay stuck between reboots.
;   This has been fixed.
;
; # Fixed DOS installer (AIRBOOT.COM) #
;   Behavior should now be the same as the eCS and WIN installers.
;   This re-enables the use of a bootable floppy or usb-stick
;   to install AiR-BOOT.
;
; # Fixed booting from FloppyDrive #
;   This is actually also broken in v1.06 when Int13X is forced on.
;   Now regular BIOS calls are used when booting from floppydrive.
;   A fresh AiR-BOOT installation now includes the floppydrive menu entry.
;
; # Fixed chainloading IBM Boot Manager #
;   AiR-BOOT v1.06 could chainload IBM-BM but only when it resided on
;   the first disk and was located below the 1024 cylinder and forced Int13X
;   extensions were disabled.
;   AiR-BOOT v1.0.8 can now chainload IBM-BM with forced Int13X extensions
;   enabled (the default) and if IBM-BM resides above the 1024 cylinder limit.
;   Also, chainloading IBM-BM from the second disk is supported.
;   Do not use chainloading IBM-BM unless you really have a need to.
;   See the AiR-BOOT Manual for "gotcha's" when using both AiR-BOOT and IBM-BM.
;
; # Corrected contact links #
;   Version 1.07 still presented the old contact links to the sourceforge
;   repository and the original author.
;   This caused confusion with regard to issues with v1.07.
;   This has been corrected.
;
; NOTE:
;   AB v1.07 had a bug with saving and loading the correct size of the
;   configuration. This broke the drive-letter feature.
;   As a result, the CRC over the config was also calculated wrongly.
;   While AB v1.0.8 fixes this, it has to use the v1.07 way of CRC calculation.
;   Otherwise SET(A)BOOT from the eCS v2.1 would break on AB v1.0.8 because it
;   sees a corrupt AiR-BOOT configuration.
;   This means that the CRC over the AB config is calculated over 5 sectors
;   instead of 7, just like in v1.07.
;
; NOTE:
;   Because of space constraints most of the debug code has been commented
;   out in this version.
;   Possibly it will be re-enabled after code cleanup and changing to JWasm.
;
;
; v1.07
; -----
; # Huge Drives and LVM #
;   When using disks >512GB under eComStation, the drive geometry changes to
;   127 or 255 sectors per track. Since LVM-info is written at the last sector
;   of a track, and AiR-BOOT uses the geometry of the MBR, it cannot find the
;   LVM-info and the eCS partition / volume bootsector.
;   This has been fixed.
;   Now, when an eCS-partition is discovered and the drive is >512GB, AiR-BOOT
;   will use the eCS geometry to locate the LVM-info and the bootsector.
;
; # Special loader handling #
;   The special handling of partition boot-loaders has been enhanced to
;   enable booting of legacy systems on huge drives with or without OS/2
;   extended geometry.
;
; # eComStation boot-through after phase 1 #
;   Special functionality is implemented to directly boot a newly
;   installed eCS system after completing phase 1 of the installation.
;   This works in conjuntion with the OS/2 specific SET(A)BOOT.EXE program,
;   also part of the AiR-BOOT package.
;
; # Math, Debug, Conv and Aux modules #
;   These are used for 32-bit arithmatic on 16-bit code,
;   debug the boot process, converting between data-types
;   and outputting log-data to the com-port.
;
;
; v1.06
; -----
; This is the last version developed by Martin Kiewitz.
; It serves as the base for the versions above.
; Please do not post your feedback on sourceforge or bother Martin with
; regard to issues with the above versions.
; Use the eCS bug-tracker or the Trac project-page at netlabs and see the
; documentation of this newer versions for the relevant contact information.